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smbios: Create a function to locate the tables

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The code in the smbios command is a nice implementation of finding the
tables. It supports both SMBIOS2 and SMBIOS3, which smbios-parser.c does
not.

Move this code over to the library, creating a struct to hold the
result.

Series-changes: 2
- Fix the return values on error

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass
2025-08-12 06:09:52 -06:00
parent 0ee25282d8
commit 40453163c8
3 changed files with 84 additions and 38 deletions
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45
lib/smbios-parser.c
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@@ -6,11 +6,15 @@
#define LOG_CATEGORY LOGC_BOOT
#include <errno.h>
#include <mapmem.h>
#include <smbios.h>
#include <string.h>
#include <tables_csum.h>
#include <asm/global_data.h>
#include <linux/kernel.h>
DECLARE_GLOBAL_DATA_PTR;
const char *smbios_get_string(void *table, int index)
{
const char *str = (char *)table +
@@ -277,3 +281,44 @@ void smbios_prepare_measurement(const struct smbios3_entry *entry,
smbios_filter_tables[i].count);
}
}
int smbios_locate(ulong addr, struct smbios_info *info)
{
static const char smbios3_sig[] = "_SM3_";
static const char smbios_sig[] = "_SM_";
void *entry;
uint size;
if (!addr)
return -EINVAL;
entry = map_sysmem(addr, 0);
if (!memcmp(entry, smbios3_sig, sizeof(smbios3_sig) - 1)) {
struct smbios3_entry *entry3 = entry;
info->table = (void *)(uintptr_t)entry3->struct_table_address;
info->version = entry3->major_ver << 16 |
entry3->minor_ver << 8 | entry3->doc_rev;
size = entry3->length;
info->max_size = entry3->table_maximum_size;
} else if (!memcmp(entry, smbios_sig, sizeof(smbios_sig) - 1)) {
struct smbios_entry *entry2 = entry;
info->version = entry2->major_ver << 16 |
entry2->minor_ver << 8;
info->table = (void *)(uintptr_t)entry2->struct_table_address;
size = entry2->length;
info->max_size = entry2->struct_table_length;
} else {
return -ENOENT;
}
if (table_compute_checksum(entry, size))
return -EIO;
info->count = 0;
for (struct smbios_header *pos = info->table; pos;
pos = smbios_next_table(pos))
info->count++;
return 0;
}