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#ifndef COREBOOT_TABLES_H
#define COREBOOT_TABLES_H
#include <stdint.h>
/* The coreboot table information is for conveying information
* from the firmware to the loaded OS image. Primarily this
* is expected to be information that cannot be discovered by
* other means, such as quering the hardware directly.
*
* All of the information should be Position Independent Data.
* That is it should be safe to relocated any of the information
* without it's meaning/correctnes changing. For table that
* can reasonably be used on multiple architectures the data
* size should be fixed. This should ease the transition between
* 32 bit and 64 bit architectures etc.
*
* The completeness test for the information in this table is:
* - Can all of the hardware be detected?
* - Are the per motherboard constants available?
* - Is there enough to allow a kernel to run that was written before
* a particular motherboard is constructed? (Assuming the kernel
* has drivers for all of the hardware but it does not have
* assumptions on how the hardware is connected together).
*
* With this test it should be straight forward to determine if a
* table entry is required or not. This should remove much of the
* long term compatibility burden as table entries which are
* irrelevant or have been replaced by better alternatives may be
* dropped. Of course it is polite and expidite to include extra
* table entries and be backwards compatible, but it is not required.
*/
/* Since coreboot is usually compiled 32bit, gcc will align 64bit
* types to 32bit boundaries. If the coreboot table is dumped on a
* 64bit system, a uint64_t would be aligned to 64bit boundaries,
* breaking the table format.
*
* lb_uint64 will keep 64bit coreboot table values aligned to 32bit
* to ensure compatibility. They can be accessed with the two functions
* below: unpack_lb64() and pack_lb64()
*
* See also: util/lbtdump/lbtdump.c
*/
struct lb_uint64 {
uint32_t lo;
uint32_t hi;
};
static inline uint64_t unpack_lb64(struct lb_uint64 value)
{
uint64_t result;
result = value.hi;
result = (result << 32) + value.lo;
return result;
}
static inline struct lb_uint64 pack_lb64(uint64_t value)
{
struct lb_uint64 result;
result.lo = (value >> 0) & 0xffffffff;
result.hi = (value >> 32) & 0xffffffff;
return result;
}
struct lb_header
{
uint8_t signature[4]; /* LBIO */
uint32_t header_bytes;
uint32_t header_checksum;
uint32_t table_bytes;
uint32_t table_checksum;
uint32_t table_entries;
};
/* Every entry in the boot environment list will correspond to a boot
* info record. Encoding both type and size. The type is obviously
* so you can tell what it is. The size allows you to skip that
* boot environment record if you don't know what it easy. This allows
* forward compatibility with records not yet defined.
*/
struct lb_record {
uint32_t tag; /* tag ID */
uint32_t size; /* size of record (in bytes) */
};
#define LB_TAG_UNUSED 0x0000
#define LB_TAG_MEMORY 0x0001
struct lb_memory_range {
struct lb_uint64 start;
struct lb_uint64 size;
uint32_t type;
#define LB_MEM_RAM 1 /* Memory anyone can use */
#define LB_MEM_RESERVED 2 /* Don't use this memory region */
#define LB_MEM_ACPI 3 /* ACPI Tables */
#define LB_MEM_NVS 4 /* ACPI NVS Memory */
#define LB_MEM_UNUSABLE 5 /* Unusable address space */
#define LB_MEM_VENDOR_RSVD 6 /* Vendor Reserved */
#define LB_MEM_TABLE 16 /* Ram configuration tables are kept in */
};
struct lb_memory {
uint32_t tag;
uint32_t size;
struct lb_memory_range map[0];
};
#define LB_TAG_HWRPB 0x0002
struct lb_hwrpb {
uint32_t tag;
uint32_t size;
uint64_t hwrpb;
};
#define LB_TAG_MAINBOARD 0x0003
struct lb_mainboard {
uint32_t tag;
uint32_t size;
uint8_t vendor_idx;
uint8_t part_number_idx;
uint8_t strings[0];
};
#define LB_TAG_VERSION 0x0004
#define LB_TAG_EXTRA_VERSION 0x0005
#define LB_TAG_BUILD 0x0006
#define LB_TAG_COMPILE_TIME 0x0007
#define LB_TAG_COMPILE_BY 0x0008
#define LB_TAG_COMPILE_HOST 0x0009
#define LB_TAG_COMPILE_DOMAIN 0x000a
#define LB_TAG_COMPILER 0x000b
#define LB_TAG_LINKER 0x000c
#define LB_TAG_ASSEMBLER 0x000d
struct lb_string {
uint32_t tag;
uint32_t size;
uint8_t string[0];
};
/* 0xe is taken by v3 */
#define LB_TAG_SERIAL 0x000f
struct lb_serial {
uint32_t tag;
uint32_t size;
#define LB_SERIAL_TYPE_IO_MAPPED 1
#define LB_SERIAL_TYPE_MEMORY_MAPPED 2
uint32_t type;
uint32_t baseaddr;
uint32_t baud;
};
#define LB_TAG_CONSOLE 0x0010
struct lb_console {
uint32_t tag;
uint32_t size;
uint16_t type;
};
#define LB_TAG_CONSOLE_SERIAL8250 0
#define LB_TAG_CONSOLE_VGA 1 // OBSOLETE
#define LB_TAG_CONSOLE_BTEXT 2 // OBSOLETE
#define LB_TAG_CONSOLE_LOGBUF 3
#define LB_TAG_CONSOLE_SROM 4 // OBSOLETE
#define LB_TAG_CONSOLE_EHCI 5
#define LB_TAG_CONSOLE_SERIAL8250MEM 6
#define LB_TAG_FORWARD 0x0011
struct lb_forward {
uint32_t tag;
uint32_t size;
uint64_t forward;
};
#define LB_TAG_FRAMEBUFFER 0x0012
struct lb_framebuffer {
uint32_t tag;
uint32_t size;
uint64_t physical_address;
uint32_t x_resolution;
uint32_t y_resolution;
uint32_t bytes_per_line;
uint8_t bits_per_pixel;
uint8_t red_mask_pos;
uint8_t red_mask_size;
uint8_t green_mask_pos;
uint8_t green_mask_size;
uint8_t blue_mask_pos;
uint8_t blue_mask_size;
uint8_t reserved_mask_pos;
uint8_t reserved_mask_size;
};
#define LB_TAG_GPIO 0x0013
struct lb_gpio {
uint32_t port;
uint32_t polarity;
uint32_t value;
#define GPIO_MAX_NAME_LENGTH 16
uint8_t name[GPIO_MAX_NAME_LENGTH];
};
struct lb_gpios {
uint32_t tag;
uint32_t size;
uint32_t count;
struct lb_gpio gpios[0];
};
#define LB_TAG_VDAT 0x0015
struct lb_vdat {
uint32_t tag;
uint32_t size;
void *vdat_addr;
uint32_t vdat_size;
};
#define LB_TAG_TIMESTAMPS 0x0016
#define LB_TAG_CBMEM_CONSOLE 0x0017
#define LB_TAG_MRC_CACHE 0x0018
struct lb_cbmem_ref {
uint32_t tag;
uint32_t size;
uint64_t cbmem_addr;
};
#define LB_TAG_VBNV 0x0019
struct lb_vbnv {
uint32_t tag;
uint32_t size;
uint32_t vbnv_start;
uint32_t vbnv_size;
};
#define LB_TAB_VBOOT_HANDOFF 0x0020
struct lb_vboot_handoff {
uint32_t tag;
uint32_t size;
void *vboot_handoff_addr;
uint32_t vboot_handoff_size;
};
/* The following structures are for the cmos definitions table */
#define LB_TAG_CMOS_OPTION_TABLE 200
/* cmos header record */
struct cmos_option_table {
uint32_t tag; /* CMOS definitions table type */
uint32_t size; /* size of the entire table */
uint32_t header_length; /* length of header */
};
/* cmos entry record
This record is variable length. The name field may be
shorter than CMOS_MAX_NAME_LENGTH. The entry may start
anywhere in the byte, but can not span bytes unless it
starts at the beginning of the byte and the length is
fills complete bytes.
*/
#define LB_TAG_OPTION 201
struct cmos_entries {
uint32_t tag; /* entry type */
uint32_t size; /* length of this record */
uint32_t bit; /* starting bit from start of image */
uint32_t length; /* length of field in bits */
uint32_t config; /* e=enumeration, h=hex, r=reserved */
uint32_t config_id; /* a number linking to an enumeration record */
#define CMOS_MAX_NAME_LENGTH 32
uint8_t name[CMOS_MAX_NAME_LENGTH]; /* name of entry in ascii,
variable length int aligned */
};
/* cmos enumerations record
This record is variable length. The text field may be
shorter than CMOS_MAX_TEXT_LENGTH.
*/
#define LB_TAG_OPTION_ENUM 202
struct cmos_enums {
uint32_t tag; /* enumeration type */
uint32_t size; /* length of this record */
uint32_t config_id; /* a number identifying the config id */
uint32_t value; /* the value associated with the text */
#define CMOS_MAX_TEXT_LENGTH 32
uint8_t text[CMOS_MAX_TEXT_LENGTH]; /* enum description in ascii,
variable length int aligned */
};
/* cmos defaults record
This record contains default settings for the cmos ram.
*/
#define LB_TAG_OPTION_DEFAULTS 203
struct cmos_defaults {
uint32_t tag; /* default type */
uint32_t size; /* length of this record */
uint32_t name_length; /* length of the following name field */
uint8_t name[CMOS_MAX_NAME_LENGTH]; /* name identifying the default */
#define CMOS_IMAGE_BUFFER_SIZE 256
uint8_t default_set[CMOS_IMAGE_BUFFER_SIZE]; /* default settings */
};
#define LB_TAG_OPTION_CHECKSUM 204
struct cmos_checksum {
uint32_t tag;
uint32_t size;
/* In practice everything is byte aligned, but things are measured
* in bits to be consistent.
*/
uint32_t range_start; /* First bit that is checksummed (byte aligned) */
uint32_t range_end; /* Last bit that is checksummed (byte aligned) */
uint32_t location; /* First bit of the checksum (byte aligned) */
uint32_t type; /* Checksum algorithm that is used */
#define CHECKSUM_NONE 0
#define CHECKSUM_PCBIOS 1
};
/* function prototypes for building the coreboot table */
unsigned long write_coreboot_table(
unsigned long low_table_start, unsigned long low_table_end,
unsigned long rom_table_start, unsigned long rom_table_end);
void lb_add_memory_range(struct lb_memory *mem,
uint32_t type, uint64_t start, uint64_t size);
/* Routines to extract part so the coreboot table or information
* from the coreboot table.
*/
struct lb_memory *get_lb_mem(void);
void fill_lb_gpios(struct lb_gpios *gpios);
#endif /* COREBOOT_TABLES_H */
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