mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-27 20:38:52 +09:00
![Simon Glass](/assets/img/avatar_default.png)
When U-Boot is booted from coreboot the SMBIOS tables are written by coreboot, not U-Boot. The existing method of updating the BIOS version string does not work in that case, since gd->smbios_version is only set when U-Boot writes the tables. Add a new function which allows the version to be updated by parsing the tables and writing the string in the correct place. Since coreboot provides a pointer to the SMBIOS tables in its sysinfo structure, this makes it easy to do the update. Signed-off-by: Simon Glass <sjg@chromium.org>
135 lines
2.9 KiB
C
135 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Copyright (C) 2020, Bachmann electronic GmbH
|
|
*/
|
|
|
|
#define LOG_CATEGORY LOGC_BOOT
|
|
|
|
#include <common.h>
|
|
#include <smbios.h>
|
|
|
|
static inline int verify_checksum(const struct smbios_entry *e)
|
|
{
|
|
/*
|
|
* Checksums for SMBIOS tables are calculated to have a value, so that
|
|
* the sum over all bytes yields zero (using unsigned 8 bit arithmetic).
|
|
*/
|
|
u8 *byte = (u8 *)e;
|
|
u8 sum = 0;
|
|
|
|
for (int i = 0; i < e->length; i++)
|
|
sum += byte[i];
|
|
|
|
return sum;
|
|
}
|
|
|
|
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 (verify_checksum(entry))
|
|
return NULL;
|
|
|
|
return entry;
|
|
}
|
|
|
|
static const struct smbios_header *next_header(const struct smbios_header *curr)
|
|
{
|
|
u8 *pos = ((u8 *)curr) + curr->length;
|
|
|
|
/* search for _double_ NULL bytes */
|
|
while (!((*pos == 0) && (*(pos + 1) == 0)))
|
|
pos++;
|
|
|
|
/* step behind the double NULL bytes */
|
|
pos += 2;
|
|
|
|
return (struct smbios_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 *)entry->struct_table_address;
|
|
|
|
for (unsigned int i = 0; i < num_header; i++) {
|
|
if (header->type == type)
|
|
return header;
|
|
|
|
header = next_header(header);
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static const 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 (const char *)pos;
|
|
}
|
|
|
|
const 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 = (char *)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;
|
|
}
|