blob: 9a62b3c760d3b41f790e28e157907466eeb8cb3f [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2020, Bachmann electronic GmbH
*/
#define LOG_CATEGORY LOGC_BOOT
#include <errno.h>
#include <smbios.h>
#include <string.h>
#include <tables_csum.h>
#include <linux/kernel.h>
const struct smbios_entry *smbios_entry(u64 address, u32 size)
{
const struct smbios_entry *entry = (struct smbios_entry *)(uintptr_t)address;
if (!address || !size)
return NULL;
if (memcmp(entry->anchor, "_SM_", 4))
return NULL;
if (table_compute_checksum(entry, entry->length))
return NULL;
return entry;
}
static u8 *find_next_header(u8 *pos)
{
/* search for _double_ NULL bytes */
while (!((*pos == 0) && (*(pos + 1) == 0)))
pos++;
/* step behind the double NULL bytes */
pos += 2;
return pos;
}
static struct smbios_header *get_next_header(const struct smbios_header *curr)
{
u8 *pos = ((u8 *)curr) + curr->length;
return (struct smbios_header *)find_next_header(pos);
}
const struct smbios_header *smbios_header(const struct smbios_entry *entry, int type)
{
const unsigned int num_header = entry->struct_count;
const struct smbios_header *header = (struct smbios_header *)((uintptr_t)entry->struct_table_address);
for (unsigned int i = 0; i < num_header; i++) {
if (header->type == type)
return header;
header = get_next_header(header);
}
return NULL;
}
static char *string_from_smbios_table(const struct smbios_header *header,
int idx)
{
unsigned int i = 1;
u8 *pos;
if (!header)
return NULL;
pos = ((u8 *)header) + header->length;
while (i < idx) {
if (*pos == 0x0)
i++;
pos++;
}
return (char *)pos;
}
char *smbios_string(const struct smbios_header *header, int index)
{
if (!header)
return NULL;
return string_from_smbios_table(header, index);
}
int smbios_update_version_full(void *smbios_tab, const char *version)
{
const struct smbios_header *hdr;
struct smbios_type0 *bios;
uint old_len, len;
char *ptr;
log_info("Updating SMBIOS table at %p\n", smbios_tab);
hdr = smbios_header(smbios_tab, SMBIOS_BIOS_INFORMATION);
if (!hdr)
return log_msg_ret("tab", -ENOENT);
bios = (struct smbios_type0 *)hdr;
ptr = smbios_string(hdr, bios->bios_ver);
if (!ptr)
return log_msg_ret("str", -ENOMEDIUM);
/*
* This string is supposed to have at least enough bytes and is
* padded with spaces. Update it, taking care not to move the
* \0 terminator, so that other strings in the string table
* are not disturbed. See smbios_add_string()
*/
old_len = strnlen(ptr, SMBIOS_STR_MAX);
len = strnlen(version, SMBIOS_STR_MAX);
if (len > old_len)
return log_ret(-ENOSPC);
log_debug("Replacing SMBIOS type 0 version string '%s'\n", ptr);
memcpy(ptr, version, len);
#ifdef LOG_DEBUG
print_buffer((ulong)ptr, ptr, 1, old_len + 1, 0);
#endif
return 0;
}
struct smbios_filter_param {
u32 offset;
u32 size;
bool is_string;
};
struct smbios_filter_table {
int type;
struct smbios_filter_param *params;
u32 count;
};
struct smbios_filter_param smbios_type1_filter_params[] = {
{offsetof(struct smbios_type1, serial_number),
FIELD_SIZEOF(struct smbios_type1, serial_number), true},
{offsetof(struct smbios_type1, uuid),
FIELD_SIZEOF(struct smbios_type1, uuid), false},
{offsetof(struct smbios_type1, wakeup_type),
FIELD_SIZEOF(struct smbios_type1, wakeup_type), false},
};
struct smbios_filter_param smbios_type2_filter_params[] = {
{offsetof(struct smbios_type2, serial_number),
FIELD_SIZEOF(struct smbios_type2, serial_number), true},
{offsetof(struct smbios_type2, chassis_location),
FIELD_SIZEOF(struct smbios_type2, chassis_location), false},
};
struct smbios_filter_param smbios_type3_filter_params[] = {
{offsetof(struct smbios_type3, serial_number),
FIELD_SIZEOF(struct smbios_type3, serial_number), true},
{offsetof(struct smbios_type3, asset_tag_number),
FIELD_SIZEOF(struct smbios_type3, asset_tag_number), true},
};
struct smbios_filter_param smbios_type4_filter_params[] = {
{offsetof(struct smbios_type4, serial_number),
FIELD_SIZEOF(struct smbios_type4, serial_number), true},
{offsetof(struct smbios_type4, asset_tag),
FIELD_SIZEOF(struct smbios_type4, asset_tag), true},
{offsetof(struct smbios_type4, part_number),
FIELD_SIZEOF(struct smbios_type4, part_number), true},
{offsetof(struct smbios_type4, core_count),
FIELD_SIZEOF(struct smbios_type4, core_count), false},
{offsetof(struct smbios_type4, core_enabled),
FIELD_SIZEOF(struct smbios_type4, core_enabled), false},
{offsetof(struct smbios_type4, thread_count),
FIELD_SIZEOF(struct smbios_type4, thread_count), false},
{offsetof(struct smbios_type4, core_count2),
FIELD_SIZEOF(struct smbios_type4, core_count2), false},
{offsetof(struct smbios_type4, core_enabled2),
FIELD_SIZEOF(struct smbios_type4, core_enabled2), false},
{offsetof(struct smbios_type4, thread_count2),
FIELD_SIZEOF(struct smbios_type4, thread_count2), false},
{offsetof(struct smbios_type4, voltage),
FIELD_SIZEOF(struct smbios_type4, voltage), false},
};
struct smbios_filter_table smbios_filter_tables[] = {
{SMBIOS_SYSTEM_INFORMATION, smbios_type1_filter_params,
ARRAY_SIZE(smbios_type1_filter_params)},
{SMBIOS_BOARD_INFORMATION, smbios_type2_filter_params,
ARRAY_SIZE(smbios_type2_filter_params)},
{SMBIOS_SYSTEM_ENCLOSURE, smbios_type3_filter_params,
ARRAY_SIZE(smbios_type3_filter_params)},
{SMBIOS_PROCESSOR_INFORMATION, smbios_type4_filter_params,
ARRAY_SIZE(smbios_type4_filter_params)},
};
static void clear_smbios_table(struct smbios_header *header,
struct smbios_filter_param *filter,
u32 count)
{
u32 i;
char *str;
u8 string_id;
for (i = 0; i < count; i++) {
if (filter[i].is_string) {
string_id = *((u8 *)header + filter[i].offset);
if (string_id == 0) /* string is empty */
continue;
str = smbios_string(header, string_id);
if (!str)
continue;
/* string is cleared to space, keep '\0' terminator */
memset(str, ' ', strlen(str));
} else {
memset((void *)((u8 *)header + filter[i].offset),
0, filter[i].size);
}
}
}
void smbios_prepare_measurement(const struct smbios3_entry *entry,
struct smbios_header *smbios_copy)
{
u32 i, j;
void *table_end;
struct smbios_header *header;
table_end = (void *)((u8 *)smbios_copy + entry->table_maximum_size);
for (i = 0; i < ARRAY_SIZE(smbios_filter_tables); i++) {
header = smbios_copy;
for (j = 0; (void *)header < table_end; j++) {
if (header->type == smbios_filter_tables[i].type)
break;
header = get_next_header(header);
}
if ((void *)header >= table_end)
continue;
clear_smbios_table(header,
smbios_filter_tables[i].params,
smbios_filter_tables[i].count);
}
}