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#include <stdint.h>
#include "smbios.h"
#include "string.h"
#include "fw_cfg.h"
#define VERSION "0.1"
#define BIOS_NAME "qboot"
#define BIOS_DATE "11/11/2019"
struct smbios_entry_point {
uint32_t signature;
uint8_t checksum;
uint8_t length;
uint8_t smbios_major_version;
uint8_t smbios_minor_version;
uint16_t max_structure_size;
uint8_t entry_point_revision;
uint8_t formatted_area[5];
char intermediate_anchor_string[5];
uint8_t intermediate_checksum;
uint16_t structure_table_length;
uint32_t structure_table_address;
uint16_t number_of_structures;
uint8_t smbios_bcd_revision;
} __attribute__((packed));
struct smbios_structure_header {
uint8_t type;
uint8_t length;
uint16_t handle;
} __attribute__((packed));
struct smbios_type_0 {
struct smbios_structure_header header;
uint8_t vendor_str;
uint8_t bios_version_str;
uint16_t bios_starting_address_segment;
uint8_t bios_release_date_str;
uint8_t bios_rom_size;
uint8_t bios_characteristics[8];
uint8_t bios_characteristics_extension_bytes[2];
uint8_t system_bios_major_release;
uint8_t system_bios_minor_release;
uint8_t embedded_controller_major_release;
uint8_t embedded_controller_minor_release;
} __attribute__((packed));
#define set_str_field_or_skip(type, field, value) \
do { \
int size = (value != NULL) ? strlen(value) + 1 : 0; \
if (size > 1) { \
memcpy(end, value, size); \
end += size; \
p->field = ++str_index; \
} else { \
p->field = 0; \
} \
} while (0)
static void smbios_new_type_0(void *start, const char *vendor,
const char *version, const char *date)
{
struct smbios_type_0 *p = (struct smbios_type_0 *)start;
char *end = (char *)start + sizeof(struct smbios_type_0);
int str_index = 0;
p->header.type = 0;
p->header.length = sizeof(struct smbios_type_0);
p->header.handle = 0;
set_str_field_or_skip(0, vendor_str, vendor);
set_str_field_or_skip(0, bios_version_str, version);
p->bios_starting_address_segment = 0xe800;
set_str_field_or_skip(0, bios_release_date_str, date);
p->bios_rom_size = 0; /* FIXME */
/* BIOS characteristics not supported */
memset(p->bios_characteristics, 0, 8);
p->bios_characteristics[0] = 0x08;
/* Enable targeted content distribution (needed for SVVP) */
p->bios_characteristics_extension_bytes[0] = 0;
p->bios_characteristics_extension_bytes[1] = 4;
p->system_bios_major_release = 0;
p->system_bios_minor_release = 0;
p->embedded_controller_major_release = 0xFF;
p->embedded_controller_minor_release = 0xFF;
*end = 0;
end++;
if (!str_index) {
*end = 0;
end++;
}
}
static struct smbios_structure_header *smbios_next(struct smbios_entry_point *ep,
struct smbios_structure_header *hdr)
{
if (!ep)
return NULL;
void *start = (void *)ep->structure_table_address;
void *end = start + ep->structure_table_length;
void *ptr;
if (hdr == NULL)
ptr = start;
else {
ptr = hdr;
if (ptr + sizeof(*hdr) > end)
return NULL;
ptr += hdr->length + 2;
while (ptr < end &&
(*(uint8_t*)(ptr-1) != '\0' || *(uint8_t*)(ptr-2) != '\0'))
ptr++;
}
hdr = ptr;
if (ptr >= end || ptr + sizeof(*hdr) >= end || ptr + hdr->length >= end)
return NULL;
return hdr;
}
void extract_smbios(void)
{
int id;
struct smbios_entry_point *ep;
uint8_t *qtables;
uint16_t qtables_length;
struct smbios_structure_header *table_header = NULL;
int need_t0 = 1;
uint16_t t0_len = sizeof(struct smbios_type_0) + strlen(BIOS_NAME) +
strlen(VERSION) + strlen(BIOS_DATE) + 4;
id = fw_cfg_file_id("etc/smbios/smbios-anchor");
if (id == -1 || (sizeof(*ep) != fw_cfg_file_size(id)))
return ;
/* malloc_fseg is 16-byte alignment default */
if (!(ep = malloc_fseg(sizeof(*ep))))
return;
fw_cfg_read_file(id, ep, sizeof(*ep));
qtables_length = ep->structure_table_length;
id = fw_cfg_file_id("etc/smbios/smbios-tables");
if (id == -1 || qtables_length != fw_cfg_file_size(id))
return ;
if (!(qtables = malloc_fseg(qtables_length + t0_len)))
return ;
qtables += t0_len;
fw_cfg_read_file(id, qtables, qtables_length);
ep->structure_table_address = (uint32_t) qtables;
ep->structure_table_length = qtables_length;
while ((table_header = smbios_next(ep, table_header))) {
if (table_header->type == 0) {
need_t0 = 0;
break;
}
}
if (need_t0) {
smbios_new_type_0(qtables - t0_len, BIOS_NAME, VERSION, BIOS_DATE);
ep->number_of_structures++;
ep->structure_table_address -= t0_len;
ep->structure_table_length += t0_len;
if (t0_len > ep->max_structure_size)
ep->max_structure_size = t0_len;
}
ep->checksum -= csum8((void *) ep, 0x10);
ep->intermediate_checksum -= csum8((void *) ep + 0x10, ep->length - 0x10);
}
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