x86: Add SMBIOS table support

System Management BIOS (SMBIOS) is a specification for how
motherboard and system vendors present management information
about their products in a standard format by extending the BIOS
interface on Intel architecture systems. As of today the latest
spec is 3.0 and can be downloaded from DMTF website. This commit
adds a simple and minimum required implementation.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>

1 files changed, 236 insertions, 0 deletions

diff --git a/arch/x86/include/asm/smbios.h b/arch/x86/include/asm/smbios.h
new file mode 100644
index 0000000..623a703
--- /dev/null
+++ b/arch/x86/include/asm/smbios.h
@@ -0,0 +1,236 @@
+/*
+ * Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
+ *
+ * Adapted from coreboot src/include/smbios.h
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef _SMBIOS_H_
+#define _SMBIOS_H_
+
+/* SMBIOS spec version implemented */
+#define SMBIOS_MAJOR_VER	3
+#define SMBIOS_MINOR_VER	0
+
+/* SMBIOS structure types */
+enum {
+	SMBIOS_BIOS_INFORMATION = 0,
+	SMBIOS_SYSTEM_INFORMATION = 1,
+	SMBIOS_BOARD_INFORMATION = 2,
+	SMBIOS_SYSTEM_ENCLOSURE = 3,
+	SMBIOS_PROCESSOR_INFORMATION = 4,
+	SMBIOS_CACHE_INFORMATION = 7,
+	SMBIOS_SYSTEM_SLOTS = 9,
+	SMBIOS_PHYS_MEMORY_ARRAY = 16,
+	SMBIOS_MEMORY_DEVICE = 17,
+	SMBIOS_MEMORY_ARRAY_MAPPED_ADDRESS = 19,
+	SMBIOS_SYSTEM_BOOT_INFORMATION = 32,
+	SMBIOS_END_OF_TABLE = 127
+};
+
+#define SMBIOS_INTERMEDIATE_OFFSET	16
+#define SMBIOS_STRUCT_EOS_BYTES		2
+
+struct __packed smbios_entry {
+	u8 anchor[4];
+	u8 checksum;
+	u8 length;
+	u8 major_ver;
+	u8 minor_ver;
+	u16 max_struct_size;
+	u8 entry_point_rev;
+	u8 formatted_area[5];
+	u8 intermediate_anchor[5];
+	u8 intermediate_checksum;
+	u16 struct_table_length;
+	u32 struct_table_address;
+	u16 struct_count;
+	u8 bcd_rev;
+};
+
+/* BIOS characteristics */
+#define BIOS_CHARACTERISTICS_PCI_SUPPORTED	(1 << 7)
+#define BIOS_CHARACTERISTICS_UPGRADEABLE	(1 << 11)
+#define BIOS_CHARACTERISTICS_SELECTABLE_BOOT	(1 << 16)
+
+#define BIOS_CHARACTERISTICS_EXT1_ACPI		(1 << 0)
+#define BIOS_CHARACTERISTICS_EXT2_TARGET	(1 << 2)
+
+struct __packed smbios_type0 {
+	u8 type;
+	u8 length;
+	u16 handle;
+	u8 vendor;
+	u8 bios_ver;
+	u16 bios_start_segment;
+	u8 bios_release_date;
+	u8 bios_rom_size;
+	u64 bios_characteristics;
+	u8 bios_characteristics_ext1;
+	u8 bios_characteristics_ext2;
+	u8 bios_major_release;
+	u8 bios_minor_release;
+	u8 ec_major_release;
+	u8 ec_minor_release;
+	char eos[SMBIOS_STRUCT_EOS_BYTES];
+};
+
+struct __packed smbios_type1 {
+	u8 type;
+	u8 length;
+	u16 handle;
+	u8 manufacturer;
+	u8 product_name;
+	u8 version;
+	u8 serial_number;
+	u8 uuid[16];
+	u8 wakeup_type;
+	u8 sku_number;
+	u8 family;
+	char eos[SMBIOS_STRUCT_EOS_BYTES];
+};
+
+#define SMBIOS_BOARD_FEATURE_HOSTING	(1 << 0)
+#define SMBIOS_BOARD_MOTHERBOARD	10
+
+struct __packed smbios_type2 {
+	u8 type;
+	u8 length;
+	u16 handle;
+	u8 manufacturer;
+	u8 product_name;
+	u8 version;
+	u8 serial_number;
+	u8 asset_tag_number;
+	u8 feature_flags;
+	u8 chassis_location;
+	u16 chassis_handle;
+	u8 board_type;
+	char eos[SMBIOS_STRUCT_EOS_BYTES];
+};
+
+#define SMBIOS_ENCLOSURE_DESKTOP	3
+#define SMBIOS_STATE_SAFE		3
+#define SMBIOS_SECURITY_NONE		3
+
+struct __packed smbios_type3 {
+	u8 type;
+	u8 length;
+	u16 handle;
+	u8 manufacturer;
+	u8 chassis_type;
+	u8 version;
+	u8 serial_number;
+	u8 asset_tag_number;
+	u8 bootup_state;
+	u8 power_supply_state;
+	u8 thermal_state;
+	u8 security_status;
+	u32 oem_defined;
+	u8 height;
+	u8 number_of_power_cords;
+	u8 element_count;
+	u8 element_record_length;
+	char eos[SMBIOS_STRUCT_EOS_BYTES];
+};
+
+#define SMBIOS_PROCESSOR_TYPE_CENTRAL	3
+#define SMBIOS_PROCESSOR_STATUS_ENABLED	1
+#define SMBIOS_PROCESSOR_UPGRADE_NONE	6
+
+struct __packed smbios_type4 {
+	u8 type;
+	u8 length;
+	u16 handle;
+	u8 socket_designation;
+	u8 processor_type;
+	u8 processor_family;
+	u8 processor_manufacturer;
+	u32 processor_id[2];
+	u8 processor_version;
+	u8 voltage;
+	u16 external_clock;
+	u16 max_speed;
+	u16 current_speed;
+	u8 status;
+	u8 processor_upgrade;
+	u16 l1_cache_handle;
+	u16 l2_cache_handle;
+	u16 l3_cache_handle;
+	u8 serial_number;
+	u8 asset_tag;
+	u8 part_number;
+	u8 core_count;
+	u8 core_enabled;
+	u8 thread_count;
+	u16 processor_characteristics;
+	u16 processor_family2;
+	u16 core_count2;
+	u16 core_enabled2;
+	u16 thread_count2;
+	char eos[SMBIOS_STRUCT_EOS_BYTES];
+};
+
+struct __packed smbios_type32 {
+	u8 type;
+	u8 length;
+	u16 handle;
+	u8 reserved[6];
+	u8 boot_status;
+	u8 eos[SMBIOS_STRUCT_EOS_BYTES];
+};
+
+struct __packed smbios_type127 {
+	u8 type;
+	u8 length;
+	u16 handle;
+	u8 eos[SMBIOS_STRUCT_EOS_BYTES];
+};
+
+struct __packed smbios_header {
+	u8 type;
+	u8 length;
+	u16 handle;
+};
+
+/**
+ * fill_smbios_header() - Fill the header of an SMBIOS table
+ *
+ * This fills the header of an SMBIOS table structure.
+ *
+ * @table:	start address of the structure
+ * @type:	the type of structure
+ * @length:	the length of the formatted area of the structure
+ * @handle:	the structure's handle, a unique 16-bit number
+ */
+static inline void fill_smbios_header(void *table, int type,
+				      int length, int handle)
+{
+	struct smbios_header *header = table;
+
+	header->type = type;
+	header->length = length - SMBIOS_STRUCT_EOS_BYTES;
+	header->handle = handle;
+}
+
+/**
+ * Function prototype to write a specific type of SMBIOS structure
+ *
+ * @addr:	start address to write the structure
+ * @handle:	the structure's handle, a unique 16-bit number
+ * @return:	size of the structure
+ */
+typedef int (*smbios_write_type)(u32 *addr, int handle);
+
+/**
+ * write_smbios_table() - Write SMBIOS table
+ *
+ * This writes SMBIOS table at a given address.
+ *
+ * @addr:	start address to write SMBIOS table
+ * @return:	end address of SMBIOS table
+ */
+u32 write_smbios_table(u32 addr);
+
+#endif /* _SMBIOS_H_ */