From af98a70a6bb54513713e4d7e55681dfdbf2b149a Mon Sep 17 00:00:00 2001 From: Taylor Hutt Date: Fri, 12 Apr 2013 10:44:56 +0000 Subject: tpm: Add casts for proper compilation When building for the Sandbox version, the casts in this change are necessary to avoid compilation issues. Signed-off-by: Taylor Hutt Signed-off-by: Simon Glass Reviewed-by: Simon Glass --- drivers/tpm/generic_lpc_tpm.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/drivers/tpm/generic_lpc_tpm.c b/drivers/tpm/generic_lpc_tpm.c index 6c494eb..04ad418 100644 --- a/drivers/tpm/generic_lpc_tpm.c +++ b/drivers/tpm/generic_lpc_tpm.c @@ -135,7 +135,7 @@ static u8 tpm_read_byte(const u8 *ptr) { u8 ret = readb(ptr); debug(PREFIX "Read reg 0x%4.4x returns 0x%2.2x\n", - (u32)ptr - (u32)lpc_tpm_dev, ret); + (u32)(uintptr_t)ptr - (u32)(uintptr_t)lpc_tpm_dev, ret); return ret; } @@ -143,21 +143,21 @@ static u32 tpm_read_word(const u32 *ptr) { u32 ret = readl(ptr); debug(PREFIX "Read reg 0x%4.4x returns 0x%8.8x\n", - (u32)ptr - (u32)lpc_tpm_dev, ret); + (u32)(uintptr_t)ptr - (u32)(uintptr_t)lpc_tpm_dev, ret); return ret; } static void tpm_write_byte(u8 value, u8 *ptr) { debug(PREFIX "Write reg 0x%4.4x with 0x%2.2x\n", - (u32)ptr - (u32)lpc_tpm_dev, value); + (u32)(uintptr_t)ptr - (u32)(uintptr_t)lpc_tpm_dev, value); writeb(value, ptr); } static void tpm_write_word(u32 value, u32 *ptr) { debug(PREFIX "Write reg 0x%4.4x with 0x%8.8x\n", - (u32)ptr - (u32)lpc_tpm_dev, value); + (u32)(uintptr_t)ptr - (u32)(uintptr_t)lpc_tpm_dev, value); writel(value, ptr); } @@ -491,5 +491,5 @@ int tis_sendrecv(const u8 *sendbuf, size_t send_size, return TPM_DRIVER_ERR; } - return tis_readresponse(recvbuf, recv_len); + return tis_readresponse(recvbuf, (u32 *)recv_len); } -- cgit v1.1 From f626799816d04502cd69cc45d2add68de8b199bd Mon Sep 17 00:00:00 2001 From: Rong Chang Date: Fri, 12 Apr 2013 10:44:57 +0000 Subject: tpm: Add Infineon slb9635_i2c TPM driver Add a driver for the I2C TPM from Infineon. Signed-off-by: Che-Liang Chiou Signed-off-by: Rong Chang Signed-off-by: Tom Wai-Hong Tam Signed-off-by: Simon Glass --- Makefile | 2 +- drivers/tpm/Makefile | 4 + drivers/tpm/slb9635_i2c/compatibility.h | 51 +++ drivers/tpm/slb9635_i2c/tpm.c | 453 ++++++++++++++++++++++++++ drivers/tpm/slb9635_i2c/tpm.h | 161 +++++++++ drivers/tpm/slb9635_i2c/tpm_tis_i2c.c | 561 ++++++++++++++++++++++++++++++++ drivers/tpm/tis_i2c.c | 181 +++++++++++ include/fdtdec.h | 1 + lib/fdtdec.c | 1 + 9 files changed, 1414 insertions(+), 1 deletion(-) create mode 100644 drivers/tpm/slb9635_i2c/compatibility.h create mode 100644 drivers/tpm/slb9635_i2c/tpm.c create mode 100644 drivers/tpm/slb9635_i2c/tpm.h create mode 100644 drivers/tpm/slb9635_i2c/tpm_tis_i2c.c create mode 100644 drivers/tpm/tis_i2c.c diff --git a/Makefile b/Makefile index db7561c..6547bc0 100644 --- a/Makefile +++ b/Makefile @@ -314,7 +314,7 @@ endif LIBS-y += drivers/rtc/librtc.o LIBS-y += drivers/serial/libserial.o LIBS-y += drivers/sound/libsound.o -LIBS-$(CONFIG_GENERIC_LPC_TPM) += drivers/tpm/libtpm.o +LIBS-y += drivers/tpm/libtpm.o LIBS-y += drivers/twserial/libtws.o LIBS-y += drivers/usb/eth/libusb_eth.o LIBS-y += drivers/usb/gadget/libusb_gadget.o diff --git a/drivers/tpm/Makefile b/drivers/tpm/Makefile index be11c8b..e8c159c 100644 --- a/drivers/tpm/Makefile +++ b/drivers/tpm/Makefile @@ -23,7 +23,11 @@ include $(TOPDIR)/config.mk LIB := $(obj)libtpm.o +$(shell mkdir -p $(obj)slb9635_i2c) + COBJS-$(CONFIG_GENERIC_LPC_TPM) = generic_lpc_tpm.o +COBJS-$(CONFIG_INFINEON_TPM_I2C) += tis_i2c.o slb9635_i2c/tpm.o +COBJS-$(CONFIG_INFINEON_TPM_I2C) += slb9635_i2c/tpm_tis_i2c.o COBJS := $(COBJS-y) SRCS := $(COBJS:.o=.c) diff --git a/drivers/tpm/slb9635_i2c/compatibility.h b/drivers/tpm/slb9635_i2c/compatibility.h new file mode 100644 index 0000000..62dc9fa --- /dev/null +++ b/drivers/tpm/slb9635_i2c/compatibility.h @@ -0,0 +1,51 @@ +/* + * Copyright (C) 2011 Infineon Technologies + * + * Authors: + * Peter Huewe + * + * Version: 2.1.1 + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#ifndef _COMPATIBILITY_H_ +#define _COMPATIBILITY_H_ + +/* all includes from U-Boot */ +#include +#include +#include +#include +#include + +/* extended error numbers from linux (see errno.h) */ +#define ECANCELED 125 /* Operation Canceled */ + +#define msleep(t) udelay((t)*1000) + +/* Timer frequency. Corresponds to msec timer resolution*/ +#define HZ 1000 + +#define dev_dbg(dev, format, arg...) debug(format, ##arg) +#define dev_err(dev, format, arg...) printf(format, ##arg) +#define dev_info(dev, format, arg...) debug(format, ##arg) +#define dbg_printf debug + +#endif diff --git a/drivers/tpm/slb9635_i2c/tpm.c b/drivers/tpm/slb9635_i2c/tpm.c new file mode 100644 index 0000000..496c48e --- /dev/null +++ b/drivers/tpm/slb9635_i2c/tpm.c @@ -0,0 +1,453 @@ +/* + * Copyright (C) 2011 Infineon Technologies + * + * Authors: + * Peter Huewe + * + * Description: + * Device driver for TCG/TCPA TPM (trusted platform module). + * Specifications at www.trustedcomputinggroup.org + * + * It is based on the Linux kernel driver tpm.c from Leendert van + * Dorn, Dave Safford, Reiner Sailer, and Kyleen Hall. + * + * Version: 2.1.1 + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation, version 2 of the + * License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#include +#include "tpm.h" + +/* global structure for tpm chip data */ +struct tpm_chip g_chip; + +enum tpm_duration { + TPM_SHORT = 0, + TPM_MEDIUM = 1, + TPM_LONG = 2, + TPM_UNDEFINED, +}; + +#define TPM_MAX_ORDINAL 243 +#define TPM_MAX_PROTECTED_ORDINAL 12 +#define TPM_PROTECTED_ORDINAL_MASK 0xFF + +/* + * Array with one entry per ordinal defining the maximum amount + * of time the chip could take to return the result. The ordinal + * designation of short, medium or long is defined in a table in + * TCG Specification TPM Main Part 2 TPM Structures Section 17. The + * values of the SHORT, MEDIUM, and LONG durations are retrieved + * from the chip during initialization with a call to tpm_get_timeouts. + */ +static const u8 tpm_protected_ordinal_duration[TPM_MAX_PROTECTED_ORDINAL] = { + TPM_UNDEFINED, /* 0 */ + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_UNDEFINED, /* 5 */ + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_SHORT, /* 10 */ + TPM_SHORT, +}; + +static const u8 tpm_ordinal_duration[TPM_MAX_ORDINAL] = { + TPM_UNDEFINED, /* 0 */ + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_UNDEFINED, /* 5 */ + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_SHORT, /* 10 */ + TPM_SHORT, + TPM_MEDIUM, + TPM_LONG, + TPM_LONG, + TPM_MEDIUM, /* 15 */ + TPM_SHORT, + TPM_SHORT, + TPM_MEDIUM, + TPM_LONG, + TPM_SHORT, /* 20 */ + TPM_SHORT, + TPM_MEDIUM, + TPM_MEDIUM, + TPM_MEDIUM, + TPM_SHORT, /* 25 */ + TPM_SHORT, + TPM_MEDIUM, + TPM_SHORT, + TPM_SHORT, + TPM_MEDIUM, /* 30 */ + TPM_LONG, + TPM_MEDIUM, + TPM_SHORT, + TPM_SHORT, + TPM_SHORT, /* 35 */ + TPM_MEDIUM, + TPM_MEDIUM, + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_MEDIUM, /* 40 */ + TPM_LONG, + TPM_MEDIUM, + TPM_SHORT, + TPM_SHORT, + TPM_SHORT, /* 45 */ + TPM_SHORT, + TPM_SHORT, + TPM_SHORT, + TPM_LONG, + TPM_MEDIUM, /* 50 */ + TPM_MEDIUM, + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_UNDEFINED, /* 55 */ + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_MEDIUM, /* 60 */ + TPM_MEDIUM, + TPM_MEDIUM, + TPM_SHORT, + TPM_SHORT, + TPM_MEDIUM, /* 65 */ + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_SHORT, /* 70 */ + TPM_SHORT, + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_UNDEFINED, /* 75 */ + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_LONG, /* 80 */ + TPM_UNDEFINED, + TPM_MEDIUM, + TPM_LONG, + TPM_SHORT, + TPM_UNDEFINED, /* 85 */ + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_SHORT, /* 90 */ + TPM_SHORT, + TPM_SHORT, + TPM_SHORT, + TPM_SHORT, + TPM_UNDEFINED, /* 95 */ + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_MEDIUM, /* 100 */ + TPM_SHORT, + TPM_SHORT, + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_UNDEFINED, /* 105 */ + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_SHORT, /* 110 */ + TPM_SHORT, + TPM_SHORT, + TPM_SHORT, + TPM_SHORT, + TPM_SHORT, /* 115 */ + TPM_SHORT, + TPM_SHORT, + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_LONG, /* 120 */ + TPM_LONG, + TPM_MEDIUM, + TPM_UNDEFINED, + TPM_SHORT, + TPM_SHORT, /* 125 */ + TPM_SHORT, + TPM_LONG, + TPM_SHORT, + TPM_SHORT, + TPM_SHORT, /* 130 */ + TPM_MEDIUM, + TPM_UNDEFINED, + TPM_SHORT, + TPM_MEDIUM, + TPM_UNDEFINED, /* 135 */ + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_SHORT, /* 140 */ + TPM_SHORT, + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_UNDEFINED, /* 145 */ + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_SHORT, /* 150 */ + TPM_MEDIUM, + TPM_MEDIUM, + TPM_SHORT, + TPM_SHORT, + TPM_UNDEFINED, /* 155 */ + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_SHORT, /* 160 */ + TPM_SHORT, + TPM_SHORT, + TPM_SHORT, + TPM_UNDEFINED, + TPM_UNDEFINED, /* 165 */ + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_LONG, /* 170 */ + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_UNDEFINED, /* 175 */ + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_MEDIUM, /* 180 */ + TPM_SHORT, + TPM_MEDIUM, + TPM_MEDIUM, + TPM_MEDIUM, + TPM_MEDIUM, /* 185 */ + TPM_SHORT, + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_UNDEFINED, /* 190 */ + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_UNDEFINED, /* 195 */ + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_SHORT, /* 200 */ + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_SHORT, + TPM_SHORT, /* 205 */ + TPM_SHORT, + TPM_SHORT, + TPM_SHORT, + TPM_SHORT, + TPM_MEDIUM, /* 210 */ + TPM_UNDEFINED, + TPM_MEDIUM, + TPM_MEDIUM, + TPM_MEDIUM, + TPM_UNDEFINED, /* 215 */ + TPM_MEDIUM, + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_SHORT, + TPM_SHORT, /* 220 */ + TPM_SHORT, + TPM_SHORT, + TPM_SHORT, + TPM_SHORT, + TPM_UNDEFINED, /* 225 */ + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_SHORT, /* 230 */ + TPM_LONG, + TPM_MEDIUM, + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_UNDEFINED, /* 235 */ + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_UNDEFINED, + TPM_SHORT, /* 240 */ + TPM_UNDEFINED, + TPM_MEDIUM, +}; + +/* + * Returns max number of milliseconds to wait + */ +unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal) +{ + int duration_idx = TPM_UNDEFINED; + int duration = 0; + + if (ordinal < TPM_MAX_ORDINAL) + duration_idx = tpm_ordinal_duration[ordinal]; + else if ((ordinal & TPM_PROTECTED_ORDINAL_MASK) < + TPM_MAX_PROTECTED_ORDINAL) + duration_idx = + tpm_protected_ordinal_duration[ordinal & + TPM_PROTECTED_ORDINAL_MASK]; + + if (duration_idx != TPM_UNDEFINED) + duration = chip->vendor.duration[duration_idx]; + if (duration <= 0) + return 2 * 60 * HZ; /*two minutes timeout*/ + else + return duration; +} + +#define TPM_CMD_COUNT_BYTE 2 +#define TPM_CMD_ORDINAL_BYTE 6 + +ssize_t tpm_transmit(const unsigned char *buf, size_t bufsiz) +{ + ssize_t rc; + u32 count, ordinal; + unsigned long start, stop; + + struct tpm_chip *chip = &g_chip; + + /* switch endianess: big->little */ + count = get_unaligned_be32(buf + TPM_CMD_COUNT_BYTE); + ordinal = get_unaligned_be32(buf + TPM_CMD_ORDINAL_BYTE); + + if (count == 0) { + dev_err(chip->dev, "no data\n"); + return -ENODATA; + } + if (count > bufsiz) { + dev_err(chip->dev, + "invalid count value %x %zx\n", count, bufsiz); + return -E2BIG; + } + + rc = chip->vendor.send(chip, (u8 *)buf, count); + if (rc < 0) { + dev_err(chip->dev, "tpm_transmit: tpm_send: error %zd\n", rc); + goto out; + } + + if (chip->vendor.irq) + goto out_recv; + + start = get_timer(0); + stop = tpm_calc_ordinal_duration(chip, ordinal); + do { + dbg_printf("waiting for status...\n"); + u8 status = chip->vendor.status(chip); + if ((status & chip->vendor.req_complete_mask) == + chip->vendor.req_complete_val) { + dbg_printf("...got it;\n"); + goto out_recv; + } + + if ((status == chip->vendor.req_canceled)) { + dev_err(chip->dev, "Operation Canceled\n"); + rc = -ECANCELED; + goto out; + } + msleep(TPM_TIMEOUT); + } while (get_timer(start) < stop); + + chip->vendor.cancel(chip); + dev_err(chip->dev, "Operation Timed out\n"); + rc = -ETIME; + goto out; + +out_recv: + + dbg_printf("out_recv: reading response...\n"); + rc = chip->vendor.recv(chip, (u8 *)buf, TPM_BUFSIZE); + if (rc < 0) + dev_err(chip->dev, "tpm_transmit: tpm_recv: error %zd\n", rc); +out: + return rc; +} + +#define TPM_ERROR_SIZE 10 + +enum tpm_capabilities { + TPM_CAP_PROP = cpu_to_be32(5), +}; + +enum tpm_sub_capabilities { + TPM_CAP_PROP_TIS_TIMEOUT = cpu_to_be32(0x115), + TPM_CAP_PROP_TIS_DURATION = cpu_to_be32(0x120), +}; + +struct tpm_chip *tpm_register_hardware(const struct tpm_vendor_specific *entry) +{ + struct tpm_chip *chip; + + /* Driver specific per-device data */ + chip = &g_chip; + memcpy(&chip->vendor, entry, sizeof(struct tpm_vendor_specific)); + chip->is_open = 1; + + return chip; +} + +int tpm_open(uint32_t dev_addr) +{ + int rc; + if (g_chip.is_open) + return -EBUSY; + rc = tpm_vendor_init(dev_addr); + if (rc < 0) + g_chip.is_open = 0; + return rc; +} + +void tpm_close(void) +{ + if (g_chip.is_open) { + tpm_vendor_cleanup(&g_chip); + g_chip.is_open = 0; + } +} diff --git a/drivers/tpm/slb9635_i2c/tpm.h b/drivers/tpm/slb9635_i2c/tpm.h new file mode 100644 index 0000000..9ddee86 --- /dev/null +++ b/drivers/tpm/slb9635_i2c/tpm.h @@ -0,0 +1,161 @@ +/* + * Copyright (C) 2011 Infineon Technologies + * + * Authors: + * Peter Huewe + * + * Version: 2.1.1 + * + * Description: + * Device driver for TCG/TCPA TPM (trusted platform module). + * Specifications at www.trustedcomputinggroup.org + * + * It is based on the Linux kernel driver tpm.c from Leendert van + * Dorn, Dave Safford, Reiner Sailer, and Kyleen Hall. + * + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation, version 2 of the + * License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#ifndef _TPM_H_ +#define _TPM_H_ + +#include + +#include "compatibility.h" + +enum tpm_timeout { + TPM_TIMEOUT = 5, /* msecs */ +}; + +/* Size of external transmit buffer (used in tpm_transmit)*/ +#define TPM_BUFSIZE 4096 + +/* Index of fields in TPM command buffer */ +#define TPM_CMD_SIZE_BYTE 2 +#define TPM_CMD_ORDINAL_BYTE 6 + +/* Index of Count field in TPM response buffer */ +#define TPM_RSP_SIZE_BYTE 2 +#define TPM_RSP_RC_BYTE 6 + +struct tpm_chip; + +struct tpm_vendor_specific { + const u8 req_complete_mask; + const u8 req_complete_val; + const u8 req_canceled; + int irq; + int (*recv) (struct tpm_chip *, u8 *, size_t); + int (*send) (struct tpm_chip *, u8 *, size_t); + void (*cancel) (struct tpm_chip *); + u8(*status) (struct tpm_chip *); + int locality; + unsigned long timeout_a, timeout_b, timeout_c, timeout_d; /* msec */ + unsigned long duration[3]; /* msec */ +}; + +struct tpm_chip { + int is_open; + struct tpm_vendor_specific vendor; +}; + +struct tpm_input_header { + __be16 tag; + __be32 length; + __be32 ordinal; +} __packed; + +struct tpm_output_header { + __be16 tag; + __be32 length; + __be32 return_code; +} __packed; + +struct timeout_t { + __be32 a; + __be32 b; + __be32 c; + __be32 d; +} __packed; + +struct duration_t { + __be32 tpm_short; + __be32 tpm_medium; + __be32 tpm_long; +} __packed; + +union cap_t { + struct timeout_t timeout; + struct duration_t duration; +}; + +struct tpm_getcap_params_in { + __be32 cap; + __be32 subcap_size; + __be32 subcap; +} __packed; + +struct tpm_getcap_params_out { + __be32 cap_size; + union cap_t cap; +} __packed; + +union tpm_cmd_header { + struct tpm_input_header in; + struct tpm_output_header out; +}; + +union tpm_cmd_params { + struct tpm_getcap_params_out getcap_out; + struct tpm_getcap_params_in getcap_in; +}; + +struct tpm_cmd_t { + union tpm_cmd_header header; + union tpm_cmd_params params; +} __packed; + + +/* ---------- Interface for TPM vendor ------------ */ + +extern struct tpm_chip *tpm_register_hardware( + const struct tpm_vendor_specific *); + +extern int tpm_vendor_init(uint32_t dev_addr); + +extern void tpm_vendor_cleanup(struct tpm_chip *chip); + +/* ---------- Interface for TDDL ------------------- */ + +/* + * if dev_addr != 0 - redefines TPM device address + * Returns < 0 on error, 0 on success. + */ +extern int tpm_open(uint32_t dev_addr); + +extern void tpm_close(void); + +/* + * Transmit bufsiz bytes out of buf to TPM and get results back in buf, too. + * Returns < 0 on error, 0 on success. + */ +extern ssize_t tpm_transmit(const unsigned char *buf, size_t bufsiz); + +#endif diff --git a/drivers/tpm/slb9635_i2c/tpm_tis_i2c.c b/drivers/tpm/slb9635_i2c/tpm_tis_i2c.c new file mode 100644 index 0000000..82a41bf --- /dev/null +++ b/drivers/tpm/slb9635_i2c/tpm_tis_i2c.c @@ -0,0 +1,561 @@ +/* + * Copyright (C) 2011 Infineon Technologies + * + * Authors: + * Peter Huewe + * + * Description: + * Device driver for TCG/TCPA TPM (trusted platform module). + * Specifications at www.trustedcomputinggroup.org + * + * This device driver implements the TPM interface as defined in + * the TCG TPM Interface Spec version 1.2, revision 1.0 and the + * Infineon I2C Protocol Stack Specification v0.20. + * + * It is based on the Linux kernel driver tpm.c from Leendert van + * Dorn, Dave Safford, Reiner Sailer, and Kyleen Hall. + * + * Version: 2.1.1 + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation, version 2 of the + * License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#include +#include +#include + +#include "compatibility.h" +#include "tpm.h" + +/* max. buffer size supported by our tpm */ +#ifdef TPM_BUFSIZE +#undef TPM_BUFSIZE +#endif +#define TPM_BUFSIZE 1260 +/* Address of the TPM on the I2C bus */ +#define TPM_I2C_ADDR 0x20 +/* max. number of iterations after i2c NAK */ +#define MAX_COUNT 3 + +#define SLEEP_DURATION 60 /*in usec*/ + +/* max. number of iterations after i2c NAK for 'long' commands + * we need this especially for sending TPM_READY, since the cleanup after the + * transtion to the ready state may take some time, but it is unpredictable + * how long it will take. + */ +#define MAX_COUNT_LONG 50 + +#define SLEEP_DURATION_LONG 210 /* in usec */ + +/* expected value for DIDVID register */ +#define TPM_TIS_I2C_DID_VID 0x000b15d1L + +/* Structure to store I2C TPM specific stuff */ +struct tpm_inf_dev { + uint addr; + u8 buf[TPM_BUFSIZE + sizeof(u8)]; /* max. buffer size + addr */ +}; + +static struct tpm_inf_dev tpm_dev = { + .addr = TPM_I2C_ADDR +}; + +/* + * iic_tpm_read() - read from TPM register + * @addr: register address to read from + * @buffer: provided by caller + * @len: number of bytes to read + * + * Read len bytes from TPM register and put them into + * buffer (little-endian format, i.e. first byte is put into buffer[0]). + * + * NOTE: TPM is big-endian for multi-byte values. Multi-byte + * values have to be swapped. + * + * Return -EIO on error, 0 on success. + */ +int iic_tpm_read(u8 addr, u8 *buffer, size_t len) +{ + int rc; + int count; + uint myaddr = addr; + /* we have to use uint here, uchar hangs the board */ + + for (count = 0; count < MAX_COUNT; count++) { + rc = i2c_write(tpm_dev.addr, 0, 0, (uchar *)&myaddr, 1); + if (rc == 0) + break; /*success, break to skip sleep*/ + + udelay(SLEEP_DURATION); + } + + if (rc) + return -rc; + + /* After the TPM has successfully received the register address it needs + * some time, thus we're sleeping here again, before retrieving the data + */ + for (count = 0; count < MAX_COUNT; count++) { + udelay(SLEEP_DURATION); + rc = i2c_read(tpm_dev.addr, 0, 0, buffer, len); + if (rc == 0) + break; /*success, break to skip sleep*/ + } + + if (rc) + return -rc; + + return 0; +} + +static int iic_tpm_write_generic(u8 addr, u8 *buffer, size_t len, + unsigned int sleep_time, + u8 max_count) +{ + int rc = 0; + int count; + + /* prepare send buffer */ + tpm_dev.buf[0] = addr; + memcpy(&(tpm_dev.buf[1]), buffer, len); + + for (count = 0; count < max_count; count++) { + rc = i2c_write(tpm_dev.addr, 0, 0, tpm_dev.buf, len + 1); + if (rc == 0) + break; /*success, break to skip sleep*/ + + udelay(sleep_time); + } + + if (rc) + return -rc; + + return 0; +} + +/* + * iic_tpm_write() - write to TPM register + * @addr: register address to write to + * @buffer: containing data to be written + * @len: number of bytes to write + * + * Write len bytes from provided buffer to TPM register (little + * endian format, i.e. buffer[0] is written as first byte). + * + * NOTE: TPM is big-endian for multi-byte values. Multi-byte + * values have to be swapped. + * + * NOTE: use this function instead of the iic_tpm_write_generic function. + * + * Return -EIO on error, 0 on success + */ +static int iic_tpm_write(u8 addr, u8 *buffer, size_t len) +{ + return iic_tpm_write_generic(addr, buffer, len, SLEEP_DURATION, + MAX_COUNT); +} + +/* + * This function is needed especially for the cleanup situation after + * sending TPM_READY + * */ +static int iic_tpm_write_long(u8 addr, u8 *buffer, size_t len) +{ + return iic_tpm_write_generic(addr, buffer, len, SLEEP_DURATION_LONG, + MAX_COUNT_LONG); +} + +#define TPM_HEADER_SIZE 10 + +enum tis_access { + TPM_ACCESS_VALID = 0x80, + TPM_ACCESS_ACTIVE_LOCALITY = 0x20, + TPM_ACCESS_REQUEST_PENDING = 0x04, + TPM_ACCESS_REQUEST_USE = 0x02, +}; + +enum tis_status { + TPM_STS_VALID = 0x80, + TPM_STS_COMMAND_READY = 0x40, + TPM_STS_GO = 0x20, + TPM_STS_DATA_AVAIL = 0x10, + TPM_STS_DATA_EXPECT = 0x08, +}; + +enum tis_defaults { + TIS_SHORT_TIMEOUT = 750, /* ms */ + TIS_LONG_TIMEOUT = 2000, /* 2 sec */ +}; + +#define TPM_ACCESS(l) (0x0000 | ((l) << 4)) +#define TPM_STS(l) (0x0001 | ((l) << 4)) +#define TPM_DATA_FIFO(l) (0x0005 | ((l) << 4)) +#define TPM_DID_VID(l) (0x0006 | ((l) << 4)) + +static int check_locality(struct tpm_chip *chip, int loc) +{ + u8 buf; + int rc; + + rc = iic_tpm_read(TPM_ACCESS(loc), &buf, 1); + if (rc < 0) + return rc; + + if ((buf & (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) == + (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) { + chip->vendor.locality = loc; + return loc; + } + + return -1; +} + +static void release_locality(struct tpm_chip *chip, int loc, int force) +{ + u8 buf; + if (iic_tpm_read(TPM_ACCESS(loc), &buf, 1) < 0) + return; + + if (force || (buf & (TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID)) == + (TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID)) { + buf = TPM_ACCESS_ACTIVE_LOCALITY; + iic_tpm_write(TPM_ACCESS(loc), &buf, 1); + } +} + +static int request_locality(struct tpm_chip *chip, int loc) +{ + unsigned long start, stop; + u8 buf = TPM_ACCESS_REQUEST_USE; + + if (check_locality(chip, loc) >= 0) + return loc; /* we already have the locality */ + + iic_tpm_write(TPM_ACCESS(loc), &buf, 1); + + /* wait for burstcount */ + start = get_timer(0); + stop = chip->vendor.timeout_a; + do { + if (check_locality(chip, loc) >= 0) + return loc; + msleep(TPM_TIMEOUT); + } while (get_timer(start) < stop); + + return -1; +} + +static u8 tpm_tis_i2c_status(struct tpm_chip *chip) +{ + /* NOTE: since i2c read may fail, return 0 in this case --> time-out */ + u8 buf; + if (iic_tpm_read(TPM_STS(chip->vendor.locality), &buf, 1) < 0) + return 0; + else + return buf; +} + +static void tpm_tis_i2c_ready(struct tpm_chip *chip) +{ + /* this causes the current command to be aborted */ + u8 buf = TPM_STS_COMMAND_READY; + iic_tpm_write_long(TPM_STS(chip->vendor.locality), &buf, 1); +} + +static ssize_t get_burstcount(struct tpm_chip *chip) +{ + unsigned long start, stop; + ssize_t burstcnt; + u8 buf[3]; + + /* wait for burstcount */ + /* which timeout value, spec has 2 answers (c & d) */ + start = get_timer(0); + stop = chip->vendor.timeout_d; + do { + /* Note: STS is little endian */ + if (iic_tpm_read(TPM_STS(chip->vendor.locality) + 1, buf, 3) + < 0) + burstcnt = 0; + else + burstcnt = (buf[2] << 16) + (buf[1] << 8) + buf[0]; + + if (burstcnt) + return burstcnt; + msleep(TPM_TIMEOUT); + } while (get_timer(start) < stop); + + return -EBUSY; +} + +static int wait_for_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout, + int *status) +{ + unsigned long start, stop; + + /* check current status */ + *status = tpm_tis_i2c_status(chip); + if ((*status & mask) == mask) + return 0; + + start = get_timer(0); + stop = timeout; + do { + msleep(TPM_TIMEOUT); + *status = tpm_tis_i2c_status(chip); + if ((*status & mask) == mask) + return 0; + + } while (get_timer(start) < stop); + + return -ETIME; +} + +static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count) +{ + size_t size = 0; + ssize_t burstcnt; + int rc; + + while (size < count) { + burstcnt = get_burstcount(chip); + + /* burstcount < 0 = tpm is busy */ + if (burstcnt < 0) + return burstcnt; + + /* limit received data to max. left */ + if (burstcnt > (count - size)) + burstcnt = count - size; + + rc = iic_tpm_read(TPM_DATA_FIFO(chip->vendor.locality), + &(buf[size]), + burstcnt); + if (rc == 0) + size += burstcnt; + } + + return size; +} + +static int tpm_tis_i2c_recv(struct tpm_chip *chip, u8 *buf, size_t count) +{ + int size = 0; + int expected, status; + + if (count < TPM_HEADER_SIZE) { + size = -EIO; + goto out; + } + + /* read first 10 bytes, including tag, paramsize, and result */ + size = recv_data(chip, buf, TPM_HEADER_SIZE); + if (size < TPM_HEADER_SIZE) { + dev_err(chip->dev, "Unable to read header\n"); + goto out; + } + + expected = get_unaligned_be32(buf + TPM_RSP_SIZE_BYTE); + if ((size_t)expected > count) { + size = -EIO; + goto out; + } + + size += recv_data(chip, &buf[TPM_HEADER_SIZE], + expected - TPM_HEADER_SIZE); + if (size < expected) { + dev_err(chip->dev, "Unable to read remainder of result\n"); + size = -ETIME; + goto out; + } + + wait_for_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c, &status); + if (status & TPM_STS_DATA_AVAIL) { /* retry? */ + dev_err(chip->dev, "Error left over data\n"); + size = -EIO; + goto out; + } + +out: + tpm_tis_i2c_ready(chip); + /* The TPM needs some time to clean up here, + * so we sleep rather than keeping the bus busy + */ + udelay(2000); + release_locality(chip, chip->vendor.locality, 0); + + return size; +} + +static int tpm_tis_i2c_send(struct tpm_chip *chip, u8 *buf, size_t len) +{ + int rc, status; + ssize_t burstcnt; + size_t count = 0; + u8 sts = TPM_STS_GO; + + if (len > TPM_BUFSIZE) + return -E2BIG; /* command is too long for our tpm, sorry */ + + if (request_locality(chip, 0) < 0) + return -EBUSY; + + status = tpm_tis_i2c_status(chip); + if ((status & TPM_STS_COMMAND_READY) == 0) { + tpm_tis_i2c_ready(chip); + if (wait_for_stat + (chip, TPM_STS_COMMAND_READY, + chip->vendor.timeout_b, &status) < 0) { + rc = -ETIME; + goto out_err; + } + } + + while (count < len - 1) { + burstcnt = get_burstcount(chip); + + /* burstcount < 0 = tpm is busy */ + if (burstcnt < 0) + return burstcnt; + + if (burstcnt > (len-1-count)) + burstcnt = len-1-count; + +#ifdef CONFIG_TPM_I2C_BURST_LIMITATION + if (burstcnt > CONFIG_TPM_I2C_BURST_LIMITATION) + burstcnt = CONFIG_TPM_I2C_BURST_LIMITATION; +#endif /* CONFIG_TPM_I2C_BURST_LIMITATION */ + + rc = iic_tpm_write(TPM_DATA_FIFO(chip->vendor.locality), + &(buf[count]), burstcnt); + if (rc == 0) + count += burstcnt; + + wait_for_stat(chip, TPM_STS_VALID, + chip->vendor.timeout_c, &status); + + if ((status & TPM_STS_DATA_EXPECT) == 0) { + rc = -EIO; + goto out_err; + } + } + + /* write last byte */ + iic_tpm_write(TPM_DATA_FIFO(chip->vendor.locality), &(buf[count]), 1); + wait_for_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c, &status); + if ((status & TPM_STS_DATA_EXPECT) != 0) { + rc = -EIO; + goto out_err; + } + + /* go and do it */ + iic_tpm_write(TPM_STS(chip->vendor.locality), &sts, 1); + + return len; +out_err: + tpm_tis_i2c_ready(chip); + /* The TPM needs some time to clean up here, + * so we sleep rather than keeping the bus busy + */ + udelay(2000); + release_locality(chip, chip->vendor.locality, 0); + + return rc; +} + +static struct tpm_vendor_specific tpm_tis_i2c = { + .status = tpm_tis_i2c_status, + .recv = tpm_tis_i2c_recv, + .send = tpm_tis_i2c_send, + .cancel = tpm_tis_i2c_ready, + .req_complete_mask = TPM_STS_DATA_AVAIL | TPM_STS_VALID, + .req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID, + .req_canceled = TPM_STS_COMMAND_READY, +}; + +/* initialisation of i2c tpm */ + + +int tpm_vendor_init(uint32_t dev_addr) +{ + u32 vendor; + uint old_addr; + int rc = 0; + struct tpm_chip *chip; + + old_addr = tpm_dev.addr; + if (dev_addr != 0) + tpm_dev.addr = dev_addr; + + chip = tpm_register_hardware(&tpm_tis_i2c); + if (chip < 0) { + rc = -ENODEV; + goto out_err; + } + + /* Disable interrupts (not supported) */ + chip->vendor.irq = 0; + + /* Default timeouts */ + chip->vendor.timeout_a = TIS_SHORT_TIMEOUT; + chip->vendor.timeout_b = TIS_LONG_TIMEOUT; + chip->vendor.timeout_c = TIS_SHORT_TIMEOUT; + chip->vendor.timeout_d = TIS_SHORT_TIMEOUT; + + if (request_locality(chip, 0) != 0) { + rc = -ENODEV; + goto out_err; + } + + /* read four bytes from DID_VID register */ + if (iic_tpm_read(TPM_DID_VID(0), (uchar *)&vendor, 4) < 0) { + rc = -EIO; + goto out_release; + } + + /* create DID_VID register value, after swapping to little-endian */ + vendor = be32_to_cpu(vendor); + + if (vendor != TPM_TIS_I2C_DID_VID) { + rc = -ENODEV; + goto out_release; + } + + dev_info(dev, "1.2 TPM (device-id 0x%X)\n", vendor >> 16); + + /* + * A timeout query to TPM can be placed here. + * Standard timeout values are used so far + */ + + return 0; + +out_release: + release_locality(chip, 0, 1); + +out_err: + tpm_dev.addr = old_addr; + return rc; +} + +void tpm_vendor_cleanup(struct tpm_chip *chip) +{ + release_locality(chip, chip->vendor.locality, 1); +} diff --git a/drivers/tpm/tis_i2c.c b/drivers/tpm/tis_i2c.c new file mode 100644 index 0000000..e818fba --- /dev/null +++ b/drivers/tpm/tis_i2c.c @@ -0,0 +1,181 @@ +/* + * Copyright (c) 2012 The Chromium OS Authors. All rights reserved. + * Use of this source code is governed by a BSD-style license that can be + * found in the LICENSE file. + */ + +#include +#include +#include +#include +#include "slb9635_i2c/tpm.h" + +DECLARE_GLOBAL_DATA_PTR; + +/* TPM configuration */ +struct tpm { + int i2c_bus; + int slave_addr; + char inited; + int old_bus; +} tpm; + + +static int tpm_select(void) +{ + int ret; + + tpm.old_bus = i2c_get_bus_num(); + if (tpm.old_bus != tpm.i2c_bus) { + ret = i2c_set_bus_num(tpm.i2c_bus); + if (ret) { + debug("%s: Fail to set i2c bus %d\n", __func__, + tpm.i2c_bus); + return -1; + } + } + return 0; +} + +static int tpm_deselect(void) +{ + int ret; + + if (tpm.old_bus != i2c_get_bus_num()) { + ret = i2c_set_bus_num(tpm.old_bus); + if (ret) { + debug("%s: Fail to restore i2c bus %d\n", + __func__, tpm.old_bus); + return -1; + } + } + tpm.old_bus = -1; + return 0; +} + +/** + * Decode TPM configuration. + * + * @param dev Returns a configuration of TPM device + * @return 0 if ok, -1 on error + */ +static int tpm_decode_config(struct tpm *dev) +{ +#ifdef CONFIG_OF_CONTROL + const void *blob = gd->fdt_blob; + int node, parent; + int i2c_bus; + + node = fdtdec_next_compatible(blob, 0, COMPAT_INFINEON_SLB9635_TPM); + if (node < 0) { + debug("%s: Node not found\n", __func__); + return -1; + } + parent = fdt_parent_offset(blob, node); + if (parent < 0) { + debug("%s: Cannot find node parent\n", __func__); + return -1; + } + i2c_bus = i2c_get_bus_num_fdt(parent); + if (i2c_bus < 0) + return -1; + dev->i2c_bus = i2c_bus; + dev->slave_addr = fdtdec_get_addr(blob, node, "reg"); +#else + dev->i2c_bus = CONFIG_INFINEON_TPM_I2C_BUS; + dev->slave_addr = CONFIG_INFINEON_TPM_I2C_ADDR; +#endif + return 0; +} + +int tis_init(void) +{ + if (tpm.inited) + return 0; + + if (tpm_decode_config(&tpm)) + return -1; + + if (tpm_select()) + return -1; + + /* + * Probe TPM twice; the first probing might fail because TPM is asleep, + * and the probing can wake up TPM. + */ + if (i2c_probe(tpm.slave_addr) && i2c_probe(tpm.slave_addr)) { + debug("%s: fail to probe i2c addr 0x%x\n", __func__, + tpm.slave_addr); + return -1; + } + + tpm_deselect(); + + tpm.inited = 1; + + return 0; +} + +int tis_open(void) +{ + int rc; + + if (!tpm.inited) + return -1; + + if (tpm_select()) + return -1; + + rc = tpm_open(tpm.slave_addr); + + tpm_deselect(); + + return rc; +} + +int tis_close(void) +{ + if (!tpm.inited) + return -1; + + if (tpm_select()) + return -1; + + tpm_close(); + + tpm_deselect(); + + return 0; +} + +int tis_sendrecv(const uint8_t *sendbuf, size_t sbuf_size, + uint8_t *recvbuf, size_t *rbuf_len) +{ + int len; + uint8_t buf[4096]; + + if (!tpm.inited) + return -1; + + if (sizeof(buf) < sbuf_size) + return -1; + + memcpy(buf, sendbuf, sbuf_size); + + if (tpm_select()) + return -1; + + len = tpm_transmit(buf, sbuf_size); + + tpm_deselect(); + + if (len < 10) { + *rbuf_len = 0; + return -1; + } + + memcpy(recvbuf, buf, len); + *rbuf_len = len; + + return 0; +} diff --git a/include/fdtdec.h b/include/fdtdec.h index e7e3ff9..39fbdf1 100644 --- a/include/fdtdec.h +++ b/include/fdtdec.h @@ -90,6 +90,7 @@ enum fdt_compat_id { COMPAT_MAXIM_MAX77686_PMIC, /* MAX77686 PMIC */ COMPAT_GENERIC_SPI_FLASH, /* Generic SPI Flash chip */ COMPAT_MAXIM_98095_CODEC, /* MAX98095 Codec */ + COMPAT_INFINEON_SLB9635_TPM, /* Infineon SLB9635 TPM */ COMPAT_COUNT, }; diff --git a/lib/fdtdec.c b/lib/fdtdec.c index e17dd00..e93743c 100644 --- a/lib/fdtdec.c +++ b/lib/fdtdec.c @@ -63,6 +63,7 @@ static const char * const compat_names[COMPAT_COUNT] = { COMPAT(MAXIM_MAX77686_PMIC, "maxim,max77686_pmic"), COMPAT(GENERIC_SPI_FLASH, "spi-flash"), COMPAT(MAXIM_98095_CODEC, "maxim,max98095-codec"), + COMPAT(INFINEON_SLB9635_TPM, "infineon,slb9635-tpm"), }; const char *fdtdec_get_compatible(enum fdt_compat_id id) -- cgit v1.1 From c1af608f6f22d58ec27b1f6ba9841d1baf12cc98 Mon Sep 17 00:00:00 2001 From: Simon Glass Date: Fri, 12 Apr 2013 10:44:58 +0000 Subject: exynos: Enable I2C TPM for smdk5250 This is used on some Exynos 5250 variants. Signed-off-by: Simon Glass --- include/configs/exynos5250-dt.h | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/include/configs/exynos5250-dt.h b/include/configs/exynos5250-dt.h index 2b9d6ac..7378487 100644 --- a/include/configs/exynos5250-dt.h +++ b/include/configs/exynos5250-dt.h @@ -129,6 +129,13 @@ #define CONFIG_USB_EHCI_EXYNOS #define CONFIG_USB_STORAGE +/* TPM */ +#define CONFIG_TPM +#define CONFIG_CMD_TPM +#define CONFIG_INFINEON_TPM_I2C +#define CONFIG_INFINEON_TPM_I2C_BUS 3 +#define CONFIG_INFINEON_TPM_I2C_ADDR 0x20 + /* MMC SPL */ #define CONFIG_SPL #define COPY_BL2_FNPTR_ADDR 0x02020030 -- cgit v1.1 From 8732b0700d21588b4954d0f1b182f4c60725d228 Mon Sep 17 00:00:00 2001 From: Che-liang Chiou Date: Thu, 28 Feb 2013 09:34:57 +0000 Subject: tpm: Add TPM command library TPM command library implements a subset of TPM commands defined in TCG Main Specification 1.2 that are useful for implementing secure boot. More TPM commands could be added out of necessity. You may exercise these commands through the 'tpm' command. However, the raw TPM commands are too primitive for writing secure boot in command interpreter scripts; so the 'tpm' command also provides helper functions to make scripting easier. For example, to define a counter in TPM non-volatile storage and initialize it to zero: $ tpm init $ tpm startup TPM_ST_CLEAR $ tpm nv_define d 0x1001 0x1 $ tpm nv_write d 0x1001 0 And then increment the counter by one: $ tpm nv_read d 0x1001 i $ setexpr.l i $i + 1 $ tpm nv_write d 0x1001 $i Signed-off-by: Che-Liang Chiou --- common/cmd_tpm.c | 709 ++++++++++++++++++++++++++++++++++++++++++++++--------- include/tis.h | 73 ++++++ include/tpm.h | 197 +++++++++++++--- lib/Makefile | 1 + lib/tpm.c | 581 +++++++++++++++++++++++++++++++++++++++++++++ 5 files changed, 1419 insertions(+), 142 deletions(-) create mode 100644 include/tis.h create mode 100644 lib/tpm.c diff --git a/common/cmd_tpm.c b/common/cmd_tpm.c index 0970a6f..46fae18 100644 --- a/common/cmd_tpm.c +++ b/common/cmd_tpm.c @@ -1,5 +1,5 @@ /* - * Copyright (c) 2011 The Chromium OS Authors. + * Copyright (c) 2013 The Chromium OS Authors. * * See file CREDITS for list of people who contributed to this * project. @@ -22,163 +22,652 @@ #include #include +#include #include +#include +#include -#define MAX_TRANSACTION_SIZE 30 +/** + * Print a byte string in hexdecimal format, 16-bytes per line. + * + * @param data byte string to be printed + * @param count number of bytes to be printed + */ +static void print_byte_string(uint8_t *data, size_t count) +{ + int i, print_newline = 0; -/* - * tpm_write() expects a variable number of parameters: the internal address - * followed by data to write, byte by byte. + for (i = 0; i < count; i++) { + printf(" %02x", data[i]); + print_newline = (i % 16 == 15); + if (print_newline) + putc('\n'); + } + /* Avoid duplicated newline at the end */ + if (!print_newline) + putc('\n'); +} + +/** + * Convert a text string of hexdecimal values into a byte string. * - * Returns 0 on success or -1 on errors (wrong arguments or TPM failure). + * @param bytes text string of hexdecimal values with no space + * between them + * @param data output buffer for byte string. The caller has to make + * sure it is large enough for storing the output. If + * NULL is passed, a large enough buffer will be allocated, + * and the caller must free it. + * @param count_ptr output variable for the length of byte string + * @return pointer to output buffer */ -static int tpm_process(int argc, char * const argv[], cmd_tbl_t *cmdtp) -{ - u8 tpm_buffer[MAX_TRANSACTION_SIZE]; - u32 write_size, read_size; - char *p; - int rv = -1; - - for (write_size = 0; write_size < argc; write_size++) { - u32 datum = simple_strtoul(argv[write_size], &p, 0); - if (*p || (datum > 0xff)) { - printf("\n%s: bad data value\n\n", argv[write_size]); - cmd_usage(cmdtp); - return rv; - } - tpm_buffer[write_size] = (u8)datum; +static void *parse_byte_string(char *bytes, uint8_t *data, size_t *count_ptr) +{ + char byte[3]; + size_t count, length; + int i; + + length = strlen(bytes); + count = length / 2; + + if (!data) + data = malloc(count); + if (!data) + return NULL; + + byte[2] = '\0'; + for (i = 0; i < length; i += 2) { + byte[0] = bytes[i]; + byte[1] = bytes[i + 1]; + data[i / 2] = (uint8_t)simple_strtoul(byte, NULL, 16); } - read_size = sizeof(tpm_buffer); - if (!tis_sendrecv(tpm_buffer, write_size, tpm_buffer, &read_size)) { - int i; - puts("Got TPM response:\n"); - for (i = 0; i < read_size; i++) - printf(" %2.2x", tpm_buffer[i]); - puts("\n"); - rv = 0; - } else { - puts("tpm command failed\n"); + if (count_ptr) + *count_ptr = count; + + return data; +} + +/** + * Convert TPM command return code to U-Boot command error codes. + * + * @param return_code TPM command return code + * @return value of enum command_ret_t + */ +static int convert_return_code(uint32_t return_code) +{ + if (return_code) + return CMD_RET_FAILURE; + else + return CMD_RET_SUCCESS; +} + +/** + * Return number of values defined by a type string. + * + * @param type_str type string + * @return number of values of type string + */ +static int type_string_get_num_values(const char *type_str) +{ + return strlen(type_str); +} + +/** + * Return total size of values defined by a type string. + * + * @param type_str type string + * @return total size of values of type string, or 0 if type string + * contains illegal type character. + */ +static size_t type_string_get_space_size(const char *type_str) +{ + size_t size; + + for (size = 0; *type_str; type_str++) { + switch (*type_str) { + case 'b': + size += 1; + break; + case 'w': + size += 2; + break; + case 'd': + size += 4; + break; + default: + return 0; + } } - return rv; + + return size; } -#define CHECK(exp) do { \ - int _rv = exp; \ - if (_rv) { \ - printf("CHECK: %s %d %x\n", #exp, __LINE__, _rv);\ - } \ - } while (0) +/** + * Allocate a buffer large enough to hold values defined by a type + * string. The caller has to free the buffer. + * + * @param type_str type string + * @param count pointer for storing size of buffer + * @return pointer to buffer or NULL on error + */ +static void *type_string_alloc(const char *type_str, uint32_t *count) +{ + void *data; + size_t size; + + size = type_string_get_space_size(type_str); + if (!size) + return NULL; + data = malloc(size); + if (data) + *count = size; -static int tpm_process_stress(int repeat_count) + return data; +} + +/** + * Pack values defined by a type string into a buffer. The buffer must have + * large enough space. + * + * @param type_str type string + * @param values text strings of values to be packed + * @param data output buffer of values + * @return 0 on success, non-0 on error + */ +static int type_string_pack(const char *type_str, char * const values[], + uint8_t *data) { - int i; - int rv = 0; - u8 request[] = {0x0, 0xc1, - 0x0, 0x0, 0x0, 0x16, - 0x0, 0x0, 0x0, 0x65, - 0x0, 0x0, 0x0, 0x4, - 0x0, 0x0, 0x0, 0x4, - 0x0, 0x0, 0x1, 0x9}; - u8 response[MAX_TRANSACTION_SIZE]; - u32 rlength = MAX_TRANSACTION_SIZE; - - CHECK(tis_init()); - - for (i = 0; i < repeat_count; i++) { - CHECK(tis_open()); - rv = tis_sendrecv(request, sizeof(request), response, &rlength); - if (rv) { - printf("tpm test failed at step %d with 0x%x\n", i, rv); - CHECK(tis_close()); + size_t offset; + uint32_t value; + + for (offset = 0; *type_str; type_str++, values++) { + value = simple_strtoul(values[0], NULL, 0); + switch (*type_str) { + case 'b': + data[offset] = value; + offset += 1; + break; + case 'w': + put_unaligned_be16(value, data + offset); + offset += 2; + break; + case 'd': + put_unaligned_be32(value, data + offset); + offset += 4; break; + default: + return -1; } - CHECK(tis_close()); - if ((response[6] || response[7] || response[8] || response[9]) - && response[9] != 0x26) { - /* Ignore postinit errors */ - printf("tpm command failed at step %d\n" - "tpm error code: %02x%02x%02x%02x\n", i, - response[6], response[7], - response[8], response[9]); - rv = -1; + } + + return 0; +} + +/** + * Read values defined by a type string from a buffer, and write these values + * to environment variables. + * + * @param type_str type string + * @param data input buffer of values + * @param vars names of environment variables + * @return 0 on success, non-0 on error + */ +static int type_string_write_vars(const char *type_str, uint8_t *data, + char * const vars[]) +{ + size_t offset; + uint32_t value; + + for (offset = 0; *type_str; type_str++, vars++) { + switch (*type_str) { + case 'b': + value = data[offset]; + offset += 1; + break; + case 'w': + value = get_unaligned_be16(data + offset); + offset += 2; break; + case 'd': + value = get_unaligned_be32(data + offset); + offset += 4; + break; + default: + return -1; } + if (setenv_ulong(*vars, value)) + return -1; } - return rv; + + return 0; } +static int do_tpm_startup(cmd_tbl_t *cmdtp, int flag, + int argc, char * const argv[]) +{ + enum tpm_startup_type mode; -static int do_tpm_many(cmd_tbl_t *cmdtp, int flag, - int argc, char * const argv[], int repeat_count) + if (argc != 2) + return CMD_RET_USAGE; + if (!strcasecmp("TPM_ST_CLEAR", argv[1])) { + mode = TPM_ST_CLEAR; + } else if (!strcasecmp("TPM_ST_STATE", argv[1])) { + mode = TPM_ST_STATE; + } else if (!strcasecmp("TPM_ST_DEACTIVATED", argv[1])) { + mode = TPM_ST_DEACTIVATED; + } else { + printf("Couldn't recognize mode string: %s\n", argv[1]); + return CMD_RET_FAILURE; + } + + return convert_return_code(tpm_startup(mode)); +} + +static int do_tpm_nv_define_space(cmd_tbl_t *cmdtp, int flag, + int argc, char * const argv[]) +{ + uint32_t index, perm, size; + + if (argc != 4) + return CMD_RET_USAGE; + index = simple_strtoul(argv[1], NULL, 0); + perm = simple_strtoul(argv[2], NULL, 0); + size = simple_strtoul(argv[3], NULL, 0); + + return convert_return_code(tpm_nv_define_space(index, perm, size)); +} +static int do_tpm_nv_read_value(cmd_tbl_t *cmdtp, int flag, + int argc, char * const argv[]) { - int rv = 0; + uint32_t index, count, rc; + void *data; - if (argc < 7 && repeat_count == 0) { - puts("command should be at least six bytes in size\n"); - return -1; + if (argc != 4) + return CMD_RET_USAGE; + index = simple_strtoul(argv[1], NULL, 0); + data = (void *)simple_strtoul(argv[2], NULL, 0); + count = simple_strtoul(argv[3], NULL, 0); + + rc = tpm_nv_read_value(index, data, count); + if (!rc) { + puts("area content:\n"); + print_byte_string(data, count); } - if (repeat_count > 0) { - rv = tpm_process_stress(repeat_count); - return rv; + return convert_return_code(rc); +} + +static int do_tpm_nv_write_value(cmd_tbl_t *cmdtp, int flag, + int argc, char * const argv[]) +{ + uint32_t index, rc; + size_t count; + void *data; + + if (argc != 3) + return CMD_RET_USAGE; + index = simple_strtoul(argv[1], NULL, 0); + data = parse_byte_string(argv[2], NULL, &count); + if (!data) { + printf("Couldn't parse byte string %s\n", argv[2]); + return CMD_RET_FAILURE; } - if (tis_init()) { - puts("tis_init() failed!\n"); - return -1; + rc = tpm_nv_write_value(index, data, count); + free(data); + + return convert_return_code(rc); +} + +static int do_tpm_extend(cmd_tbl_t *cmdtp, int flag, + int argc, char * const argv[]) +{ + uint32_t index, rc; + uint8_t in_digest[20], out_digest[20]; + + if (argc != 3) + return CMD_RET_USAGE; + index = simple_strtoul(argv[1], NULL, 0); + if (!parse_byte_string(argv[2], in_digest, NULL)) { + printf("Couldn't parse byte string %s\n", argv[2]); + return CMD_RET_FAILURE; } - if (tis_open()) { - puts("tis_open() failed!\n"); - return -1; + rc = tpm_extend(index, in_digest, out_digest); + if (!rc) { + puts("PCR value after execution of the command:\n"); + print_byte_string(out_digest, sizeof(out_digest)); } - rv = tpm_process(argc - 1, argv + 1, cmdtp); + return convert_return_code(rc); +} + +static int do_tpm_pcr_read(cmd_tbl_t *cmdtp, int flag, + int argc, char * const argv[]) +{ + uint32_t index, count, rc; + void *data; + + if (argc != 4) + return CMD_RET_USAGE; + index = simple_strtoul(argv[1], NULL, 0); + data = (void *)simple_strtoul(argv[2], NULL, 0); + count = simple_strtoul(argv[3], NULL, 0); - if (tis_close()) { - puts("tis_close() failed!\n"); - rv = -1; + rc = tpm_pcr_read(index, data, count); + if (!rc) { + puts("Named PCR content:\n"); + print_byte_string(data, count); } - return rv; + return convert_return_code(rc); } +static int do_tpm_tsc_physical_presence(cmd_tbl_t *cmdtp, int flag, + int argc, char * const argv[]) +{ + uint16_t presence; + + if (argc != 2) + return CMD_RET_USAGE; + presence = (uint16_t)simple_strtoul(argv[1], NULL, 0); -static int do_tpm(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) + return convert_return_code(tpm_tsc_physical_presence(presence)); +} + +static int do_tpm_read_pubek(cmd_tbl_t *cmdtp, int flag, + int argc, char * const argv[]) { - return do_tpm_many(cmdtp, flag, argc, argv, 0); + uint32_t count, rc; + void *data; + + if (argc != 3) + return CMD_RET_USAGE; + data = (void *)simple_strtoul(argv[1], NULL, 0); + count = simple_strtoul(argv[2], NULL, 0); + + rc = tpm_read_pubek(data, count); + if (!rc) { + puts("pubek value:\n"); + print_byte_string(data, count); + } + + return convert_return_code(rc); } +static int do_tpm_physical_set_deactivated(cmd_tbl_t *cmdtp, int flag, + int argc, char * const argv[]) +{ + uint8_t state; + + if (argc != 2) + return CMD_RET_USAGE; + state = (uint8_t)simple_strtoul(argv[1], NULL, 0); -U_BOOT_CMD(tpm, MAX_TRANSACTION_SIZE, 1, do_tpm, - " [ ...] - write data and read response", - "send arbitrary data (at least 6 bytes) to the TPM " - "device and read the response" -); + return convert_return_code(tpm_physical_set_deactivated(state)); +} + +static int do_tpm_get_capability(cmd_tbl_t *cmdtp, int flag, + int argc, char * const argv[]) +{ + uint32_t cap_area, sub_cap, rc; + void *cap; + size_t count; + + if (argc != 5) + return CMD_RET_USAGE; + cap_area = simple_strtoul(argv[1], NULL, 0); + sub_cap = simple_strtoul(argv[2], NULL, 0); + cap = (void *)simple_strtoul(argv[3], NULL, 0); + count = simple_strtoul(argv[4], NULL, 0); + + rc = tpm_get_capability(cap_area, sub_cap, cap, count); + if (!rc) { + puts("capability information:\n"); + print_byte_string(cap, count); + } + + return convert_return_code(rc); +} -static int do_tpm_stress(cmd_tbl_t *cmdtp, int flag, - int argc, char * const argv[]) +#define TPM_COMMAND_NO_ARG(cmd) \ +static int do_##cmd(cmd_tbl_t *cmdtp, int flag, \ + int argc, char * const argv[]) \ +{ \ + if (argc != 1) \ + return CMD_RET_USAGE; \ + return convert_return_code(cmd()); \ +} + +TPM_COMMAND_NO_ARG(tpm_init) +TPM_COMMAND_NO_ARG(tpm_self_test_full) +TPM_COMMAND_NO_ARG(tpm_continue_self_test) +TPM_COMMAND_NO_ARG(tpm_force_clear) +TPM_COMMAND_NO_ARG(tpm_physical_enable) +TPM_COMMAND_NO_ARG(tpm_physical_disable) + +static int do_tpm_raw_transfer(cmd_tbl_t *cmdtp, int flag, + int argc, char * const argv[]) +{ + void *command; + uint8_t response[1024]; + size_t count, response_length = sizeof(response); + uint32_t rc; + + command = parse_byte_string(argv[1], NULL, &count); + if (!command) { + printf("Couldn't parse byte string %s\n", argv[1]); + return CMD_RET_FAILURE; + } + + rc = tis_sendrecv(command, count, response, &response_length); + free(command); + if (!rc) { + puts("tpm response:\n"); + print_byte_string(response, response_length); + } + + return convert_return_code(rc); +} + +static int do_tpm_nv_define(cmd_tbl_t *cmdtp, int flag, + int argc, char * const argv[]) +{ + uint32_t index, perm, size; + + if (argc != 4) + return CMD_RET_USAGE; + size = type_string_get_space_size(argv[1]); + if (!size) { + printf("Couldn't parse arguments\n"); + return CMD_RET_USAGE; + } + index = simple_strtoul(argv[2], NULL, 0); + perm = simple_strtoul(argv[3], NULL, 0); + + return convert_return_code(tpm_nv_define_space(index, perm, size)); +} + +static int do_tpm_nv_read(cmd_tbl_t *cmdtp, int flag, + int argc, char * const argv[]) { - long unsigned int n; - int rv; + uint32_t index, count, err; + void *data; - if (argc != 2) { - puts("usage: tpm_stress \n"); - return -1; + if (argc < 3) + return CMD_RET_USAGE; + if (argc != 3 + type_string_get_num_values(argv[1])) + return CMD_RET_USAGE; + index = simple_strtoul(argv[2], NULL, 0); + data = type_string_alloc(argv[1], &count); + if (!data) { + printf("Couldn't parse arguments\n"); + return CMD_RET_USAGE; } - rv = strict_strtoul(argv[1], 10, &n); - if (rv) { - puts("tpm_stress: bad count"); - return -1; + err = tpm_nv_read_value(index, data, count); + if (!err) { + if (type_string_write_vars(argv[1], data, argv + 3)) { + printf("Couldn't write to variables\n"); + err = ~0; + } } + free(data); + + return convert_return_code(err); +} + +static int do_tpm_nv_write(cmd_tbl_t *cmdtp, int flag, + int argc, char * const argv[]) +{ + uint32_t index, count, err; + void *data; + + if (argc < 3) + return CMD_RET_USAGE; + if (argc != 3 + type_string_get_num_values(argv[1])) + return CMD_RET_USAGE; + index = simple_strtoul(argv[2], NULL, 0); + data = type_string_alloc(argv[1], &count); + if (!data) { + printf("Couldn't parse arguments\n"); + return CMD_RET_USAGE; + } + if (type_string_pack(argv[1], argv + 3, data)) { + printf("Couldn't parse arguments\n"); + free(data); + return CMD_RET_USAGE; + } + + err = tpm_nv_write_value(index, data, count); + free(data); + + return convert_return_code(err); +} + +#define MAKE_TPM_CMD_ENTRY(cmd) \ + U_BOOT_CMD_MKENT(cmd, 0, 1, do_tpm_ ## cmd, "", "") + +static cmd_tbl_t tpm_commands[] = { + U_BOOT_CMD_MKENT(init, 0, 1, + do_tpm_init, "", ""), + U_BOOT_CMD_MKENT(startup, 0, 1, + do_tpm_startup, "", ""), + U_BOOT_CMD_MKENT(self_test_full, 0, 1, + do_tpm_self_test_full, "", ""), + U_BOOT_CMD_MKENT(continue_self_test, 0, 1, + do_tpm_continue_self_test, "", ""), + U_BOOT_CMD_MKENT(force_clear, 0, 1, + do_tpm_force_clear, "", ""), + U_BOOT_CMD_MKENT(physical_enable, 0, 1, + do_tpm_physical_enable, "", ""), + U_BOOT_CMD_MKENT(physical_disable, 0, 1, + do_tpm_physical_disable, "", ""), + U_BOOT_CMD_MKENT(nv_define_space, 0, 1, + do_tpm_nv_define_space, "", ""), + U_BOOT_CMD_MKENT(nv_read_value, 0, 1, + do_tpm_nv_read_value, "", ""), + U_BOOT_CMD_MKENT(nv_write_value, 0, 1, + do_tpm_nv_write_value, "", ""), + U_BOOT_CMD_MKENT(extend, 0, 1, + do_tpm_extend, "", ""), + U_BOOT_CMD_MKENT(pcr_read, 0, 1, + do_tpm_pcr_read, "", ""), + U_BOOT_CMD_MKENT(tsc_physical_presence, 0, 1, + do_tpm_tsc_physical_presence, "", ""), + U_BOOT_CMD_MKENT(read_pubek, 0, 1, + do_tpm_read_pubek, "", ""), + U_BOOT_CMD_MKENT(physical_set_deactivated, 0, 1, + do_tpm_physical_set_deactivated, "", ""), + U_BOOT_CMD_MKENT(get_capability, 0, 1, + do_tpm_get_capability, "", ""), + U_BOOT_CMD_MKENT(raw_transfer, 0, 1, + do_tpm_raw_transfer, "", ""), + U_BOOT_CMD_MKENT(nv_define, 0, 1, + do_tpm_nv_define, "", ""), + U_BOOT_CMD_MKENT(nv_read, 0, 1, + do_tpm_nv_read, "", ""), + U_BOOT_CMD_MKENT(nv_write, 0, 1, + do_tpm_nv_write, "", ""), +}; + +static int do_tpm(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) +{ + cmd_tbl_t *tpm_cmd; + + if (argc < 2) + return CMD_RET_USAGE; + tpm_cmd = find_cmd_tbl(argv[1], tpm_commands, ARRAY_SIZE(tpm_commands)); + if (!tpm_cmd) + return CMD_RET_USAGE; - return do_tpm_many(cmdtp, flag, argc, argv, n); + return tpm_cmd->cmd(cmdtp, flag, argc - 1, argv + 1); } -U_BOOT_CMD(tpm_stress, 2, 1, do_tpm_stress, - " - stress-test communication with TPM", - "Repeat a TPM transaction (request-response) N times" +U_BOOT_CMD(tpm, CONFIG_SYS_MAXARGS, 1, do_tpm, +"Issue a TPM command", +"cmd args...\n" +" - Issue TPM command with arguments .\n" +"Admin Startup and State Commands:\n" +" init\n" +" - Put TPM into a state where it waits for 'startup' command.\n" +" startup mode\n" +" - Issue TPM_Starup command. is one of TPM_ST_CLEAR,\n" +" TPM_ST_STATE, and TPM_ST_DEACTIVATED.\n" +"Admin Testing Commands:\n" +" self_test_full\n" +" - Test all of the TPM capabilities.\n" +" continue_self_test\n" +" - Inform TPM that it should complete the self-test.\n" +"Admin Opt-in Commands:\n" +" physical_enable\n" +" - Set the PERMANENT disable flag to FALSE using physical presence as\n" +" authorization.\n" +" physical_disable\n" +" - Set the PERMANENT disable flag to TRUE using physical presence as\n" +" authorization.\n" +" physical_set_deactivated 0|1\n" +" - Set deactivated flag.\n" +"Admin Ownership Commands:\n" +" force_clear\n" +" - Issue TPM_ForceClear command.\n" +" tsc_physical_presence flags\n" +" - Set TPM device's Physical Presence flags to .\n" +"The Capability Commands:\n" +" get_capability cap_area sub_cap addr count\n" +" - Read bytes of TPM capability indexed by and\n" +" to memory address .\n" +"Endorsement Key Handling Commands:\n" +" read_pubek addr count\n" +" - Read bytes of the public endorsement key to memory\n" +" address \n" +"Integrity Collection and Reporting Commands:\n" +" extend index digest_hex_string\n" +" - Add a new measurement to a PCR. Update PCR with the 20-bytes\n" +" \n" +" pcr_read index addr count\n" +" - Read bytes from PCR to memory address .\n" +"Non-volatile Storage Commands:\n" +" nv_define_space index permission size\n" +" - Establish a space at index with of bytes.\n" +" nv_read_value index addr count\n" +" - Read bytes from space to memory address .\n" +" nv_write_value index addr count\n" +" - Write bytes from memory address to space .\n" +"Miscellaneous helper functions:\n" +" raw_transfer byte_string\n" +" - Send a byte string to TPM and print the response.\n" +" Non-volatile storage helper functions:\n" +" These helper functions treat a non-volatile space as a non-padded\n" +" sequence of integer values. These integer values are defined by a type\n" +" string, which is a text string of 'bwd' characters: 'b' means a 8-bit\n" +" value, 'w' 16-bit value, 'd' 32-bit value. All helper functions take\n" +" a type string as their first argument.\n" +" nv_define type_string index perm\n" +" - Define a space with permission .\n" +" nv_read types_string index vars...\n" +" - Read from space to environment variables .\n" +" nv_write types_string index values...\n" +" - Write to space from values .\n" ); diff --git a/include/tis.h b/include/tis.h new file mode 100644 index 0000000..89e5730 --- /dev/null +++ b/include/tis.h @@ -0,0 +1,73 @@ +/* + * Copyright (c) 2011 The Chromium OS Authors. + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#ifndef __TIS_H +#define __TIS_H + +#include + +/* Low-level interface to access TPM */ + +/* + * tis_init() + * + * Initialize the TPM device. Returns 0 on success or -1 on + * failure (in case device probing did not succeed). + */ +int tis_init(void); + +/* + * tis_open() + * + * Requests access to locality 0 for the caller. After all commands have been + * completed the caller is supposed to call tis_close(). + * + * Returns 0 on success, -1 on failure. + */ +int tis_open(void); + +/* + * tis_close() + * + * terminate the currect session with the TPM by releasing the locked + * locality. Returns 0 on success of -1 on failure (in case lock + * removal did not succeed). + */ +int tis_close(void); + +/* + * tis_sendrecv() + * + * Send the requested data to the TPM and then try to get its response + * + * @sendbuf - buffer of the data to send + * @send_size size of the data to send + * @recvbuf - memory to save the response to + * @recv_len - pointer to the size of the response buffer + * + * Returns 0 on success (and places the number of response bytes at recv_len) + * or -1 on failure. + */ +int tis_sendrecv(const uint8_t *sendbuf, size_t send_size, uint8_t *recvbuf, + size_t *recv_len); + +#endif /* __TIS_H */ diff --git a/include/tpm.h b/include/tpm.h index 6b21e9c..7219b73 100644 --- a/include/tpm.h +++ b/include/tpm.h @@ -1,5 +1,5 @@ /* - * Copyright (c) 2011 The Chromium OS Authors. + * Copyright (c) 2013 The Chromium OS Authors. * * See file CREDITS for list of people who contributed to this * project. @@ -20,52 +20,185 @@ * MA 02111-1307 USA */ -#ifndef _INCLUDE_TPM_H_ -#define _INCLUDE_TPM_H_ +#ifndef __TPM_H +#define __TPM_H -#include +#include /* - * tis_init() + * Here is a partial implementation of TPM commands. Please consult TCG Main + * Specification for definitions of TPM commands. + */ + +enum tpm_startup_type { + TPM_ST_CLEAR = 0x0001, + TPM_ST_STATE = 0x0002, + TPM_ST_DEACTIVATED = 0x0003, +}; + +enum tpm_physical_presence { + TPM_PHYSICAL_PRESENCE_HW_DISABLE = 0x0200, + TPM_PHYSICAL_PRESENCE_CMD_DISABLE = 0x0100, + TPM_PHYSICAL_PRESENCE_LIFETIME_LOCK = 0x0080, + TPM_PHYSICAL_PRESENCE_HW_ENABLE = 0x0040, + TPM_PHYSICAL_PRESENCE_CMD_ENABLE = 0x0020, + TPM_PHYSICAL_PRESENCE_NOTPRESENT = 0x0010, + TPM_PHYSICAL_PRESENCE_PRESENT = 0x0008, + TPM_PHYSICAL_PRESENCE_LOCK = 0x0004, +}; + +enum tpm_nv_index { + TPM_NV_INDEX_LOCK = 0xffffffff, + TPM_NV_INDEX_0 = 0x00000000, + TPM_NV_INDEX_DIR = 0x10000001, +}; + +/** + * Initialize TPM device. It must be called before any TPM commands. * - * Initialize the TPM device. Returns 0 on success or -1 on - * failure (in case device probing did not succeed). + * @return 0 on success, non-0 on error. */ -int tis_init(void); +uint32_t tpm_init(void); -/* - * tis_open() +/** + * Issue a TPM_Startup command. * - * Requests access to locality 0 for the caller. After all commands have been - * completed the caller is supposed to call tis_close(). + * @param mode TPM startup mode + * @return return code of the operation + */ +uint32_t tpm_startup(enum tpm_startup_type mode); + +/** + * Issue a TPM_SelfTestFull command. * - * Returns 0 on success, -1 on failure. + * @return return code of the operation */ -int tis_open(void); +uint32_t tpm_self_test_full(void); -/* - * tis_close() +/** + * Issue a TPM_ContinueSelfTest command. * - * terminate the currect session with the TPM by releasing the locked - * locality. Returns 0 on success of -1 on failure (in case lock - * removal did not succeed). + * @return return code of the operation */ -int tis_close(void); +uint32_t tpm_continue_self_test(void); -/* - * tis_sendrecv() +/** + * Issue a TPM_NV_DefineSpace command. The implementation is limited + * to specify TPM_NV_ATTRIBUTES and size of the area. The area index + * could be one of the special value listed in enum tpm_nv_index. * - * Send the requested data to the TPM and then try to get its response + * @param index index of the area + * @param perm TPM_NV_ATTRIBUTES of the area + * @param size size of the area + * @return return code of the operation + */ +uint32_t tpm_nv_define_space(uint32_t index, uint32_t perm, uint32_t size); + +/** + * Issue a TPM_NV_ReadValue command. This implementation is limited + * to read the area from offset 0. The area index could be one of + * the special value listed in enum tpm_nv_index. + * + * @param index index of the area + * @param data output buffer of the area contents + * @param count size of output buffer + * @return return code of the operation + */ +uint32_t tpm_nv_read_value(uint32_t index, void *data, uint32_t count); + +/** + * Issue a TPM_NV_WriteValue command. This implementation is limited + * to write the area from offset 0. The area index could be one of + * the special value listed in enum tpm_nv_index. + * + * @param index index of the area + * @param data input buffer to be wrote to the area + * @param length length of data bytes of input buffer + * @return return code of the operation + */ +uint32_t tpm_nv_write_value(uint32_t index, const void *data, uint32_t length); + +/** + * Issue a TPM_Extend command. + * + * @param index index of the PCR + * @param in_digest 160-bit value representing the event to be + * recorded + * @param out_digest 160-bit PCR value after execution of the + * command + * @return return code of the operation + */ +uint32_t tpm_extend(uint32_t index, const void *in_digest, void *out_digest); + +/** + * Issue a TPM_PCRRead command. * - * @sendbuf - buffer of the data to send - * @send_size size of the data to send - * @recvbuf - memory to save the response to - * @recv_len - pointer to the size of the response buffer + * @param index index of the PCR + * @param data output buffer for contents of the named PCR + * @param count size of output buffer + * @return return code of the operation + */ +uint32_t tpm_pcr_read(uint32_t index, void *data, size_t count); + +/** + * Issue a TSC_PhysicalPresence command. TPM physical presence flag + * is bit-wise OR'ed of flags listed in enum tpm_physical_presence. + * + * @param presence TPM physical presence flag + * @return return code of the operation + */ +uint32_t tpm_tsc_physical_presence(uint16_t presence); + +/** + * Issue a TPM_ReadPubek command. + * + * @param data output buffer for the public endorsement key + * @param count size of ouput buffer + * @return return code of the operation + */ +uint32_t tpm_read_pubek(void *data, size_t count); + +/** + * Issue a TPM_ForceClear command. + * + * @return return code of the operation + */ +uint32_t tpm_force_clear(void); + +/** + * Issue a TPM_PhysicalEnable command. + * + * @return return code of the operation + */ +uint32_t tpm_physical_enable(void); + +/** + * Issue a TPM_PhysicalDisable command. + * + * @return return code of the operation + */ +uint32_t tpm_physical_disable(void); + +/** + * Issue a TPM_PhysicalSetDeactivated command. + * + * @param state boolean state of the deactivated flag + * @return return code of the operation + */ +uint32_t tpm_physical_set_deactivated(uint8_t state); + +/** + * Issue a TPM_GetCapability command. This implementation is limited + * to query sub_cap index that is 4-byte wide. * - * Returns 0 on success (and places the number of response bytes at recv_len) - * or -1 on failure. + * @param cap_area partition of capabilities + * @param sub_cap further definition of capability, which is + * limited to be 4-byte wide + * @param cap output buffer for capability information + * @param count size of ouput buffer + * @return return code of the operation */ -int tis_sendrecv(const uint8_t *sendbuf, size_t send_size, uint8_t *recvbuf, - size_t *recv_len); +uint32_t tpm_get_capability(uint32_t cap_area, uint32_t sub_cap, + void *cap, size_t count); -#endif /* _INCLUDE_TPM_H_ */ +#endif /* __TPM_H */ diff --git a/lib/Makefile b/lib/Makefile index 1bfd3ee..d57775d 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -54,6 +54,7 @@ COBJS-y += qsort.o COBJS-$(CONFIG_SHA1) += sha1.o COBJS-$(CONFIG_SHA256) += sha256.o COBJS-y += strmhz.o +COBJS-$(CONFIG_TPM) += tpm.o COBJS-$(CONFIG_RBTREE) += rbtree.o endif diff --git a/lib/tpm.c b/lib/tpm.c new file mode 100644 index 0000000..42c9bea --- /dev/null +++ b/lib/tpm.c @@ -0,0 +1,581 @@ +/* + * Copyright (c) 2013 The Chromium OS Authors. + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#include +#include +#include +#include + +/* Internal error of TPM command library */ +#define TPM_LIB_ERROR ((uint32_t)~0u) + +/* Useful constants */ +enum { + COMMAND_BUFFER_SIZE = 256, + TPM_PUBEK_SIZE = 256, + TPM_REQUEST_HEADER_LENGTH = 10, + TPM_RESPONSE_HEADER_LENGTH = 10, + PCR_DIGEST_LENGTH = 20, +}; + +/** + * Pack data into a byte string. The data types are specified in + * the format string: 'b' means unsigned byte, 'w' unsigned word, + * 'd' unsigned double word, and 's' byte string. The data are a + * series of offsets and values (for type byte string there are also + * lengths). The data values are packed into the byte string + * sequentially, and so a latter value could over-write a former + * value. + * + * @param str output string + * @param size size of output string + * @param format format string + * @param ... data points + * @return 0 on success, non-0 on error + */ +int pack_byte_string(uint8_t *str, size_t size, const char *format, ...) +{ + va_list args; + size_t offset = 0, length = 0; + uint8_t *data = NULL; + uint32_t value = 0; + + va_start(args, format); + for (; *format; format++) { + switch (*format) { + case 'b': + offset = va_arg(args, size_t); + value = va_arg(args, int); + length = 1; + break; + case 'w': + offset = va_arg(args, size_t); + value = va_arg(args, int); + length = 2; + break; + case 'd': + offset = va_arg(args, size_t); + value = va_arg(args, uint32_t); + length = 4; + break; + case 's': + offset = va_arg(args, size_t); + data = va_arg(args, uint8_t *); + length = va_arg(args, uint32_t); + break; + default: + debug("Couldn't recognize format string\n"); + return -1; + } + + if (offset + length > size) + return -1; + + switch (*format) { + case 'b': + str[offset] = value; + break; + case 'w': + put_unaligned_be16(value, str + offset); + break; + case 'd': + put_unaligned_be32(value, str + offset); + break; + case 's': + memcpy(str + offset, data, length); + break; + } + } + va_end(args); + + return 0; +} + +/** + * Unpack data from a byte string. The data types are specified in + * the format string: 'b' means unsigned byte, 'w' unsigned word, + * 'd' unsigned double word, and 's' byte string. The data are a + * series of offsets and pointers (for type byte string there are also + * lengths). + * + * @param str output string + * @param size size of output string + * @param format format string + * @param ... data points + * @return 0 on success, non-0 on error + */ +int unpack_byte_string(const uint8_t *str, size_t size, const char *format, ...) +{ + va_list args; + size_t offset = 0, length = 0; + uint8_t *ptr8 = NULL; + uint16_t *ptr16 = NULL; + uint32_t *ptr32 = NULL; + + va_start(args, format); + for (; *format; format++) { + switch (*format) { + case 'b': + offset = va_arg(args, size_t); + ptr8 = va_arg(args, uint8_t *); + length = 1; + break; + case 'w': + offset = va_arg(args, size_t); + ptr16 = va_arg(args, uint16_t *); + length = 2; + break; + case 'd': + offset = va_arg(args, size_t); + ptr32 = va_arg(args, uint32_t *); + length = 4; + break; + case 's': + offset = va_arg(args, size_t); + ptr8 = va_arg(args, uint8_t *); + length = va_arg(args, uint32_t); + break; + default: + debug("Couldn't recognize format string\n"); + return -1; + } + + if (offset + length > size) + return -1; + + switch (*format) { + case 'b': + *ptr8 = str[offset]; + break; + case 'w': + *ptr16 = get_unaligned_be16(str + offset); + break; + case 'd': + *ptr32 = get_unaligned_be32(str + offset); + break; + case 's': + memcpy(ptr8, str + offset, length); + break; + } + } + va_end(args); + + return 0; +} + +/** + * Get TPM command size. + * + * @param command byte string of TPM command + * @return command size of the TPM command + */ +static uint32_t tpm_command_size(const void *command) +{ + const size_t command_size_offset = 2; + return get_unaligned_be32(command + command_size_offset); +} + +/** + * Get TPM response return code, which is one of TPM_RESULT values. + * + * @param response byte string of TPM response + * @return return code of the TPM response + */ +static uint32_t tpm_return_code(const void *response) +{ + const size_t return_code_offset = 6; + return get_unaligned_be32(response + return_code_offset); +} + +/** + * Send a TPM command and return response's return code, and optionally + * return response to caller. + * + * @param command byte string of TPM command + * @param response output buffer for TPM response, or NULL if the + * caller does not care about it + * @param size_ptr output buffer size (input parameter) and TPM + * response length (output parameter); this parameter + * is a bidirectional + * @return return code of the TPM response + */ +static uint32_t tpm_sendrecv_command(const void *command, + void *response, size_t *size_ptr) +{ + uint8_t response_buffer[COMMAND_BUFFER_SIZE]; + size_t response_length; + uint32_t err; + + if (response) { + response_length = *size_ptr; + } else { + response = response_buffer; + response_length = sizeof(response_buffer); + } + err = tis_sendrecv(command, tpm_command_size(command), + response, &response_length); + if (err) + return TPM_LIB_ERROR; + if (response) + *size_ptr = response_length; + + return tpm_return_code(response); +} + +uint32_t tpm_init(void) +{ + uint32_t err; + + err = tis_init(); + if (err) + return err; + + return tis_open(); +} + +uint32_t tpm_startup(enum tpm_startup_type mode) +{ + const uint8_t command[12] = { + 0x0, 0xc1, 0x0, 0x0, 0x0, 0xc, 0x0, 0x0, 0x0, 0x99, 0x0, 0x0, + }; + const size_t mode_offset = 10; + uint8_t buf[COMMAND_BUFFER_SIZE]; + + if (pack_byte_string(buf, sizeof(buf), "sw", + 0, command, sizeof(command), + mode_offset, mode)) + return TPM_LIB_ERROR; + + return tpm_sendrecv_command(buf, NULL, NULL); +} + +uint32_t tpm_self_test_full(void) +{ + const uint8_t command[10] = { + 0x0, 0xc1, 0x0, 0x0, 0x0, 0xa, 0x0, 0x0, 0x0, 0x50, + }; + return tpm_sendrecv_command(command, NULL, NULL); +} + +uint32_t tpm_continue_self_test(void) +{ + const uint8_t command[10] = { + 0x0, 0xc1, 0x0, 0x0, 0x0, 0xa, 0x0, 0x0, 0x0, 0x53, + }; + return tpm_sendrecv_command(command, NULL, NULL); +} + +uint32_t tpm_nv_define_space(uint32_t index, uint32_t perm, uint32_t size) +{ + const uint8_t command[101] = { + 0x0, 0xc1, /* TPM_TAG */ + 0x0, 0x0, 0x0, 0x65, /* parameter size */ + 0x0, 0x0, 0x0, 0xcc, /* TPM_COMMAND_CODE */ + /* TPM_NV_DATA_PUBLIC->... */ + 0x0, 0x18, /* ...->TPM_STRUCTURE_TAG */ + 0, 0, 0, 0, /* ...->TPM_NV_INDEX */ + /* TPM_NV_DATA_PUBLIC->TPM_PCR_INFO_SHORT */ + 0x0, 0x3, + 0, 0, 0, + 0x1f, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + /* TPM_NV_DATA_PUBLIC->TPM_PCR_INFO_SHORT */ + 0x0, 0x3, + 0, 0, 0, + 0x1f, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + /* TPM_NV_ATTRIBUTES->... */ + 0x0, 0x17, /* ...->TPM_STRUCTURE_TAG */ + 0, 0, 0, 0, /* ...->attributes */ + /* End of TPM_NV_ATTRIBUTES */ + 0, /* bReadSTClear */ + 0, /* bWriteSTClear */ + 0, /* bWriteDefine */ + 0, 0, 0, 0, /* size */ + }; + const size_t index_offset = 12; + const size_t perm_offset = 70; + const size_t size_offset = 77; + uint8_t buf[COMMAND_BUFFER_SIZE]; + + if (pack_byte_string(buf, sizeof(buf), "sddd", + 0, command, sizeof(command), + index_offset, index, + perm_offset, perm, + size_offset, size)) + return TPM_LIB_ERROR; + + return tpm_sendrecv_command(buf, NULL, NULL); +} + +uint32_t tpm_nv_read_value(uint32_t index, void *data, uint32_t count) +{ + const uint8_t command[22] = { + 0x0, 0xc1, 0x0, 0x0, 0x0, 0x16, 0x0, 0x0, 0x0, 0xcf, + }; + const size_t index_offset = 10; + const size_t length_offset = 18; + const size_t data_size_offset = 10; + const size_t data_offset = 14; + uint8_t buf[COMMAND_BUFFER_SIZE], response[COMMAND_BUFFER_SIZE]; + size_t response_length = sizeof(response); + uint32_t data_size; + uint32_t err; + + if (pack_byte_string(buf, sizeof(buf), "sdd", + 0, command, sizeof(command), + index_offset, index, + length_offset, count)) + return TPM_LIB_ERROR; + err = tpm_sendrecv_command(buf, response, &response_length); + if (err) + return err; + if (unpack_byte_string(response, response_length, "d", + data_size_offset, &data_size)) + return TPM_LIB_ERROR; + if (data_size > count) + return TPM_LIB_ERROR; + if (unpack_byte_string(response, response_length, "s", + data_offset, data, data_size)) + return TPM_LIB_ERROR; + + return 0; +} + +uint32_t tpm_nv_write_value(uint32_t index, const void *data, uint32_t length) +{ + const uint8_t command[256] = { + 0x0, 0xc1, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xcd, + }; + const size_t command_size_offset = 2; + const size_t index_offset = 10; + const size_t length_offset = 18; + const size_t data_offset = 22; + const size_t write_info_size = 12; + const uint32_t total_length = + TPM_REQUEST_HEADER_LENGTH + write_info_size + length; + uint8_t buf[COMMAND_BUFFER_SIZE], response[COMMAND_BUFFER_SIZE]; + size_t response_length = sizeof(response); + uint32_t err; + + if (pack_byte_string(buf, sizeof(buf), "sddds", + 0, command, sizeof(command), + command_size_offset, total_length, + index_offset, index, + length_offset, length, + data_offset, data, length)) + return TPM_LIB_ERROR; + err = tpm_sendrecv_command(buf, response, &response_length); + if (err) + return err; + + return 0; +} + +uint32_t tpm_extend(uint32_t index, const void *in_digest, void *out_digest) +{ + const uint8_t command[34] = { + 0x0, 0xc1, 0x0, 0x0, 0x0, 0x22, 0x0, 0x0, 0x0, 0x14, + }; + const size_t index_offset = 10; + const size_t in_digest_offset = 14; + const size_t out_digest_offset = 10; + uint8_t buf[COMMAND_BUFFER_SIZE]; + uint8_t response[TPM_RESPONSE_HEADER_LENGTH + PCR_DIGEST_LENGTH]; + size_t response_length = sizeof(response); + uint32_t err; + + if (pack_byte_string(buf, sizeof(buf), "sds", + 0, command, sizeof(command), + index_offset, index, + in_digest_offset, in_digest, + PCR_DIGEST_LENGTH)) + return TPM_LIB_ERROR; + err = tpm_sendrecv_command(buf, response, &response_length); + if (err) + return err; + + if (unpack_byte_string(response, response_length, "s", + out_digest_offset, out_digest, + PCR_DIGEST_LENGTH)) + return TPM_LIB_ERROR; + + return 0; +} + +uint32_t tpm_pcr_read(uint32_t index, void *data, size_t count) +{ + const uint8_t command[14] = { + 0x0, 0xc1, 0x0, 0x0, 0x0, 0xe, 0x0, 0x0, 0x0, 0x15, + }; + const size_t index_offset = 10; + const size_t out_digest_offset = 10; + uint8_t buf[COMMAND_BUFFER_SIZE], response[COMMAND_BUFFER_SIZE]; + size_t response_length = sizeof(response); + uint32_t err; + + if (count < PCR_DIGEST_LENGTH) + return TPM_LIB_ERROR; + + if (pack_byte_string(buf, sizeof(buf), "sd", + 0, command, sizeof(command), + index_offset, index)) + return TPM_LIB_ERROR; + err = tpm_sendrecv_command(buf, response, &response_length); + if (err) + return err; + if (unpack_byte_string(response, response_length, "s", + out_digest_offset, data, PCR_DIGEST_LENGTH)) + return TPM_LIB_ERROR; + + return 0; +} + +uint32_t tpm_tsc_physical_presence(uint16_t presence) +{ + const uint8_t command[12] = { + 0x0, 0xc1, 0x0, 0x0, 0x0, 0xc, 0x40, 0x0, 0x0, 0xa, 0x0, 0x0, + }; + const size_t presence_offset = 10; + uint8_t buf[COMMAND_BUFFER_SIZE]; + + if (pack_byte_string(buf, sizeof(buf), "sw", + 0, command, sizeof(command), + presence_offset, presence)) + return TPM_LIB_ERROR; + + return tpm_sendrecv_command(buf, NULL, NULL); +} + +uint32_t tpm_read_pubek(void *data, size_t count) +{ + const uint8_t command[30] = { + 0x0, 0xc1, 0x0, 0x0, 0x0, 0x1e, 0x0, 0x0, 0x0, 0x7c, + }; + const size_t response_size_offset = 2; + const size_t data_offset = 10; + const size_t header_and_checksum_size = TPM_RESPONSE_HEADER_LENGTH + 20; + uint8_t response[COMMAND_BUFFER_SIZE + TPM_PUBEK_SIZE]; + size_t response_length = sizeof(response); + uint32_t data_size; + uint32_t err; + + err = tpm_sendrecv_command(command, response, &response_length); + if (err) + return err; + if (unpack_byte_string(response, response_length, "d", + response_size_offset, &data_size)) + return TPM_LIB_ERROR; + if (data_size < header_and_checksum_size) + return TPM_LIB_ERROR; + data_size -= header_and_checksum_size; + if (data_size > count) + return TPM_LIB_ERROR; + if (unpack_byte_string(response, response_length, "s", + data_offset, data, data_size)) + return TPM_LIB_ERROR; + + return 0; +} + +uint32_t tpm_force_clear(void) +{ + const uint8_t command[10] = { + 0x0, 0xc1, 0x0, 0x0, 0x0, 0xa, 0x0, 0x0, 0x0, 0x5d, + }; + + return tpm_sendrecv_command(command, NULL, NULL); +} + +uint32_t tpm_physical_enable(void) +{ + const uint8_t command[10] = { + 0x0, 0xc1, 0x0, 0x0, 0x0, 0xa, 0x0, 0x0, 0x0, 0x6f, + }; + + return tpm_sendrecv_command(command, NULL, NULL); +} + +uint32_t tpm_physical_disable(void) +{ + const uint8_t command[10] = { + 0x0, 0xc1, 0x0, 0x0, 0x0, 0xa, 0x0, 0x0, 0x0, 0x70, + }; + + return tpm_sendrecv_command(command, NULL, NULL); +} + +uint32_t tpm_physical_set_deactivated(uint8_t state) +{ + const uint8_t command[11] = { + 0x0, 0xc1, 0x0, 0x0, 0x0, 0xb, 0x0, 0x0, 0x0, 0x72, + }; + const size_t state_offset = 10; + uint8_t buf[COMMAND_BUFFER_SIZE]; + + if (pack_byte_string(buf, sizeof(buf), "sb", + 0, command, sizeof(command), + state_offset, state)) + return TPM_LIB_ERROR; + + return tpm_sendrecv_command(buf, NULL, NULL); +} + +uint32_t tpm_get_capability(uint32_t cap_area, uint32_t sub_cap, + void *cap, size_t count) +{ + const uint8_t command[22] = { + 0x0, 0xc1, /* TPM_TAG */ + 0x0, 0x0, 0x0, 0x16, /* parameter size */ + 0x0, 0x0, 0x0, 0x65, /* TPM_COMMAND_CODE */ + 0x0, 0x0, 0x0, 0x0, /* TPM_CAPABILITY_AREA */ + 0x0, 0x0, 0x0, 0x4, /* subcap size */ + 0x0, 0x0, 0x0, 0x0, /* subcap value */ + }; + const size_t cap_area_offset = 10; + const size_t sub_cap_offset = 18; + const size_t cap_offset = 14; + const size_t cap_size_offset = 10; + uint8_t buf[COMMAND_BUFFER_SIZE], response[COMMAND_BUFFER_SIZE]; + size_t response_length = sizeof(response); + uint32_t cap_size; + uint32_t err; + + if (pack_byte_string(buf, sizeof(buf), "sdd", + 0, command, sizeof(command), + cap_area_offset, cap_area, + sub_cap_offset, sub_cap)) + return TPM_LIB_ERROR; + err = tpm_sendrecv_command(buf, response, &response_length); + if (err) + return err; + if (unpack_byte_string(response, response_length, "d", + cap_size_offset, &cap_size)) + return TPM_LIB_ERROR; + if (cap_size > response_length || cap_size > count) + return TPM_LIB_ERROR; + if (unpack_byte_string(response, response_length, "s", + cap_offset, cap, cap_size)) + return TPM_LIB_ERROR; + + return 0; +} -- cgit v1.1