/* * (C) Copyright 2007 Semihalf * * Written by: Rafal Jaworowski <raj@semihalf.com> * * 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 <config.h> #include <command.h> #include <common.h> #include <malloc.h> #include <environment.h> #include <linux/types.h> #include <api_public.h> #include "api_private.h" #define DEBUG #undef DEBUG /***************************************************************************** * * This is the API core. * * API_ functions are part of U-Boot code and constitute the lowest level * calls: * * - they know what values they need as arguments * - their direct return value pertains to the API_ "shell" itself (0 on * success, some error code otherwise) * - if the call returns a value it is buried within arguments * ****************************************************************************/ #ifdef DEBUG #define debugf(fmt, args...) do { printf("%s(): ", __func__); printf(fmt, ##args); } while (0) #else #define debugf(fmt, args...) #endif typedef int (*cfp_t)(va_list argp); static int calls_no; /* * pseudo signature: * * int API_getc(int *c) */ static int API_getc(va_list ap) { int *c; if ((c = (int *)va_arg(ap, u_int32_t)) == NULL) return API_EINVAL; *c = getc(); return 0; } /* * pseudo signature: * * int API_tstc(int *c) */ static int API_tstc(va_list ap) { int *t; if ((t = (int *)va_arg(ap, u_int32_t)) == NULL) return API_EINVAL; *t = tstc(); return 0; } /* * pseudo signature: * * int API_putc(char *ch) */ static int API_putc(va_list ap) { char *c; if ((c = (char *)va_arg(ap, u_int32_t)) == NULL) return API_EINVAL; putc(*c); return 0; } /* * pseudo signature: * * int API_puts(char **s) */ static int API_puts(va_list ap) { char *s; if ((s = (char *)va_arg(ap, u_int32_t)) == NULL) return API_EINVAL; puts(s); return 0; } /* * pseudo signature: * * int API_reset(void) */ static int API_reset(va_list ap) { do_reset(NULL, 0, 0, NULL); /* NOT REACHED */ return 0; } /* * pseudo signature: * * int API_get_sys_info(struct sys_info *si) * * fill out the sys_info struct containing selected parameters about the * machine */ static int API_get_sys_info(va_list ap) { struct sys_info *si; si = (struct sys_info *)va_arg(ap, u_int32_t); if (si == NULL) return API_ENOMEM; return (platform_sys_info(si)) ? 0 : API_ENODEV; } /* * pseudo signature: * * int API_udelay(unsigned long *udelay) */ static int API_udelay(va_list ap) { unsigned long *d; if ((d = (unsigned long *)va_arg(ap, u_int32_t)) == NULL) return API_EINVAL; udelay(*d); return 0; } /* * pseudo signature: * * int API_get_timer(unsigned long *current, unsigned long *base) */ static int API_get_timer(va_list ap) { unsigned long *base, *cur; cur = (unsigned long *)va_arg(ap, u_int32_t); if (cur == NULL) return API_EINVAL; base = (unsigned long *)va_arg(ap, u_int32_t); if (base == NULL) return API_EINVAL; *cur = get_timer(*base); return 0; } /***************************************************************************** * * pseudo signature: * * int API_dev_enum(struct device_info *) * * * cookies uniqely identify the previously enumerated device instance and * provide a hint for what to inspect in current enum iteration: * * - net: ð_device struct address from list pointed to by eth_devices * * - storage: block_dev_desc_t struct address from &ide_dev_desc[n], * &scsi_dev_desc[n] and similar tables * ****************************************************************************/ static int API_dev_enum(va_list ap) { struct device_info *di; /* arg is ptr to the device_info struct we are going to fill out */ di = (struct device_info *)va_arg(ap, u_int32_t); if (di == NULL) return API_EINVAL; if (di->cookie == NULL) { /* start over - clean up enumeration */ dev_enum_reset(); /* XXX shouldn't the name contain 'stor'? */ debugf("RESTART ENUM\n"); /* net device enumeration first */ if (dev_enum_net(di)) return 0; } /* * The hidden assumption is there can only be one active network * device and it is identified upon enumeration (re)start, so there's * no point in trying to find network devices in other cases than the * (re)start and hence the 'next' device can only be storage */ if (!dev_enum_storage(di)) /* make sure we mark there are no more devices */ di->cookie = NULL; return 0; } static int API_dev_open(va_list ap) { struct device_info *di; int err = 0; /* arg is ptr to the device_info struct */ di = (struct device_info *)va_arg(ap, u_int32_t); if (di == NULL) return API_EINVAL; /* Allow only one consumer of the device at a time */ if (di->state == DEV_STA_OPEN) return API_EBUSY; if (di->cookie == NULL) return API_ENODEV; if (di->type & DEV_TYP_STOR) err = dev_open_stor(di->cookie); else if (di->type & DEV_TYP_NET) err = dev_open_net(di->cookie); else err = API_ENODEV; if (!err) di->state = DEV_STA_OPEN; return err; } static int API_dev_close(va_list ap) { struct device_info *di; int err = 0; /* arg is ptr to the device_info struct */ di = (struct device_info *)va_arg(ap, u_int32_t); if (di == NULL) return API_EINVAL; if (di->state == DEV_STA_CLOSED) return 0; if (di->cookie == NULL) return API_ENODEV; if (di->type & DEV_TYP_STOR) err = dev_close_stor(di->cookie); else if (di->type & DEV_TYP_NET) err = dev_close_net(di->cookie); else /* * In case of unknown device we cannot change its state, so * only return error code */ err = API_ENODEV; if (!err) di->state = DEV_STA_CLOSED; return err; } /* * Notice: this is for sending network packets only, as U-Boot does not * support writing to storage at the moment (12.2007) * * pseudo signature: * * int API_dev_write( * struct device_info *di, * void *buf, * int *len * ) * * buf: ptr to buffer from where to get the data to send * * len: length of packet to be sent (in bytes) * */ static int API_dev_write(va_list ap) { struct device_info *di; void *buf; int *len; int err = 0; /* 1. arg is ptr to the device_info struct */ di = (struct device_info *)va_arg(ap, u_int32_t); if (di == NULL) return API_EINVAL; /* XXX should we check if device is open? i.e. the ->state ? */ if (di->cookie == NULL) return API_ENODEV; /* 2. arg is ptr to buffer from where to get data to write */ buf = (void *)va_arg(ap, u_int32_t); if (buf == NULL) return API_EINVAL; /* 3. arg is length of buffer */ len = (int *)va_arg(ap, u_int32_t); if (len == NULL) return API_EINVAL; if (*len <= 0) return API_EINVAL; if (di->type & DEV_TYP_STOR) /* * write to storage is currently not supported by U-Boot: * no storage device implements block_write() method */ return API_ENODEV; else if (di->type & DEV_TYP_NET) err = dev_write_net(di->cookie, buf, *len); else err = API_ENODEV; return err; } /* * pseudo signature: * * int API_dev_read( * struct device_info *di, * void *buf, * size_t *len, * unsigned long *start * size_t *act_len * ) * * buf: ptr to buffer where to put the read data * * len: ptr to length to be read * - network: len of packet to read (in bytes) * - storage: # of blocks to read (can vary in size depending on define) * * start: ptr to start block (only used for storage devices, ignored for * network) * * act_len: ptr to where to put the len actually read */ static int API_dev_read(va_list ap) { struct device_info *di; void *buf; lbasize_t *len_stor, *act_len_stor; lbastart_t *start; int *len_net, *act_len_net; /* 1. arg is ptr to the device_info struct */ di = (struct device_info *)va_arg(ap, u_int32_t); if (di == NULL) return API_EINVAL; /* XXX should we check if device is open? i.e. the ->state ? */ if (di->cookie == NULL) return API_ENODEV; /* 2. arg is ptr to buffer from where to put the read data */ buf = (void *)va_arg(ap, u_int32_t); if (buf == NULL) return API_EINVAL; if (di->type & DEV_TYP_STOR) { /* 3. arg - ptr to var with # of blocks to read */ len_stor = (lbasize_t *)va_arg(ap, u_int32_t); if (!len_stor) return API_EINVAL; if (*len_stor <= 0) return API_EINVAL; /* 4. arg - ptr to var with start block */ start = (lbastart_t *)va_arg(ap, u_int32_t); /* 5. arg - ptr to var where to put the len actually read */ act_len_stor = (lbasize_t *)va_arg(ap, u_int32_t); if (!act_len_stor) return API_EINVAL; *act_len_stor = dev_read_stor(di->cookie, buf, *len_stor, *start); } else if (di->type & DEV_TYP_NET) { /* 3. arg points to the var with length of packet to read */ len_net = (int *)va_arg(ap, u_int32_t); if (!len_net) return API_EINVAL; if (*len_net <= 0) return API_EINVAL; /* 4. - ptr to var where to put the len actually read */ act_len_net = (int *)va_arg(ap, u_int32_t); if (!act_len_net) return API_EINVAL; *act_len_net = dev_read_net(di->cookie, buf, *len_net); } else return API_ENODEV; return 0; } /* * pseudo signature: * * int API_env_get(const char *name, char **value) * * name: ptr to name of env var */ static int API_env_get(va_list ap) { char *name, **value; if ((name = (char *)va_arg(ap, u_int32_t)) == NULL) return API_EINVAL; if ((value = (char **)va_arg(ap, u_int32_t)) == NULL) return API_EINVAL; *value = getenv(name); return 0; } /* * pseudo signature: * * int API_env_set(const char *name, const char *value) * * name: ptr to name of env var * * value: ptr to value to be set */ static int API_env_set(va_list ap) { char *name, *value; if ((name = (char *)va_arg(ap, u_int32_t)) == NULL) return API_EINVAL; if ((value = (char *)va_arg(ap, u_int32_t)) == NULL) return API_EINVAL; setenv(name, value); return 0; } /* * pseudo signature: * * int API_env_enum(const char *last, char **next) * * last: ptr to name of env var found in last iteration */ static int API_env_enum(va_list ap) { int i, n; char *last, **next; last = (char *)va_arg(ap, u_int32_t); if ((next = (char **)va_arg(ap, u_int32_t)) == NULL) return API_EINVAL; if (last == NULL) /* start over */ *next = ((char *)env_get_addr(0)); else { *next = last; for (i = 0; env_get_char(i) != '\0'; i = n + 1) { for (n = i; env_get_char(n) != '\0'; ++n) { if (n >= CONFIG_ENV_SIZE) { /* XXX shouldn't we set *next = NULL?? */ return 0; } } if (envmatch((uchar *)last, i) < 0) continue; /* try to get next name */ i = n + 1; if (env_get_char(i) == '\0') { /* no more left */ *next = NULL; return 0; } *next = ((char *)env_get_addr(i)); return 0; } } return 0; } static cfp_t calls_table[API_MAXCALL] = { NULL, }; /* * The main syscall entry point - this is not reentrant, only one call is * serviced until finished. * * e.g. syscall(1, int *, u_int32_t, u_int32_t, u_int32_t, u_int32_t); * * call: syscall number * * retval: points to the return value placeholder, this is the place the * syscall puts its return value, if NULL the caller does not * expect a return value * * ... syscall arguments (variable number) * * returns: 0 if the call not found, 1 if serviced */ int syscall(int call, int *retval, ...) { va_list ap; int rv; if (call < 0 || call >= calls_no) { debugf("invalid call #%d\n", call); return 0; } if (calls_table[call] == NULL) { debugf("syscall #%d does not have a handler\n", call); return 0; } va_start(ap, retval); rv = calls_table[call](ap); if (retval != NULL) *retval = rv; return 1; } void api_init(void) { struct api_signature *sig = NULL; /* TODO put this into linker set one day... */ calls_table[API_RSVD] = NULL; calls_table[API_GETC] = &API_getc; calls_table[API_PUTC] = &API_putc; calls_table[API_TSTC] = &API_tstc; calls_table[API_PUTS] = &API_puts; calls_table[API_RESET] = &API_reset; calls_table[API_GET_SYS_INFO] = &API_get_sys_info; calls_table[API_UDELAY] = &API_udelay; calls_table[API_GET_TIMER] = &API_get_timer; calls_table[API_DEV_ENUM] = &API_dev_enum; calls_table[API_DEV_OPEN] = &API_dev_open; calls_table[API_DEV_CLOSE] = &API_dev_close; calls_table[API_DEV_READ] = &API_dev_read; calls_table[API_DEV_WRITE] = &API_dev_write; calls_table[API_ENV_GET] = &API_env_get; calls_table[API_ENV_SET] = &API_env_set; calls_table[API_ENV_ENUM] = &API_env_enum; calls_no = API_MAXCALL; debugf("API initialized with %d calls\n", calls_no); dev_stor_init(); /* * Produce the signature so the API consumers can find it */ sig = malloc(sizeof(struct api_signature)); if (sig == NULL) { printf("API: could not allocate memory for the signature!\n"); return; } debugf("API sig @ 0x%08x\n", sig); memcpy(sig->magic, API_SIG_MAGIC, 8); sig->version = API_SIG_VERSION; sig->syscall = &syscall; sig->checksum = 0; sig->checksum = crc32(0, (unsigned char *)sig, sizeof(struct api_signature)); debugf("syscall entry: 0x%08x\n", sig->syscall); } void platform_set_mr(struct sys_info *si, unsigned long start, unsigned long size, int flags) { int i; if (!si->mr || !size || (flags == 0)) return; /* find free slot */ for (i = 0; i < si->mr_no; i++) if (si->mr[i].flags == 0) { /* insert new mem region */ si->mr[i].start = start; si->mr[i].size = size; si->mr[i].flags = flags; return; } }