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/* SPDX-License-Identifier: BSD-3-Clause */
#include <assert.h>
#include <console/console.h>
#include <cbmem.h>
#include <fmap.h>
#include <string.h>
#include <timestamp.h>
#include "vpd.h"
#include "vpd_decode.h"
#include "vpd_tables.h"
struct vpd_gets_arg {
const uint8_t *key;
const uint8_t *value;
int32_t key_len, value_len;
int matched;
};
struct vpd_blob vpd_blob;
/*
* returns the size of data in a VPD 2.0 formatted fmap region, or 0.
* Also sets *base as the region's base address.
*/
static int32_t get_vpd_size(const char *fmap_name, int32_t *base)
{
struct google_vpd_info info;
struct region_device vpd;
int32_t size;
if (fmap_locate_area_as_rdev(fmap_name, &vpd)) {
printk(BIOS_ERR, "%s: No %s FMAP section.\n", __func__,
fmap_name);
return 0;
}
size = region_device_sz(&vpd);
if ((size < GOOGLE_VPD_2_0_OFFSET + sizeof(info)) ||
rdev_chain(&vpd, &vpd, GOOGLE_VPD_2_0_OFFSET,
size - GOOGLE_VPD_2_0_OFFSET)) {
printk(BIOS_ERR, "%s: Too small (%d) for Google VPD 2.0.\n",
__func__, size);
return 0;
}
/* Try if we can find a google_vpd_info, otherwise read whole VPD. */
if (rdev_readat(&vpd, &info, *base, sizeof(info)) != sizeof(info)) {
printk(BIOS_ERR, "ERROR: Failed to read %s header.\n",
fmap_name);
return 0;
}
if (memcmp(info.header.magic, VPD_INFO_MAGIC, sizeof(info.header.magic))
== 0 && size >= info.size + sizeof(info)) {
*base += sizeof(info);
size = info.size;
} else if (info.header.tlv.type == VPD_TYPE_TERMINATOR ||
info.header.tlv.type == VPD_TYPE_IMPLICIT_TERMINATOR) {
printk(BIOS_WARNING, "WARNING: %s is uninitialized or empty.\n",
fmap_name);
size = 0;
} else {
size -= GOOGLE_VPD_2_0_OFFSET;
}
return size;
}
static void vpd_get_blob(void)
{
int32_t ro_vpd_base = 0;
int32_t rw_vpd_base = 0;
int32_t ro_vpd_size = get_vpd_size("RO_VPD", &ro_vpd_base);
int32_t rw_vpd_size = get_vpd_size("RW_VPD", &rw_vpd_base);
/* Return if no VPD at all */
if (ro_vpd_size == 0 && rw_vpd_size == 0)
return;
vpd_blob.ro_base = NULL;
vpd_blob.ro_size = 0;
vpd_blob.rw_base = NULL;
vpd_blob.rw_size = 0;
struct region_device vpd;
if (ro_vpd_size) {
if (fmap_locate_area_as_rdev("RO_VPD", &vpd)) {
/* shouldn't happen, but let's be extra defensive */
printk(BIOS_ERR, "%s: No RO_VPD FMAP section.\n",
__func__);
return;
}
rdev_chain(&vpd, &vpd, GOOGLE_VPD_2_0_OFFSET,
region_device_sz(&vpd) - GOOGLE_VPD_2_0_OFFSET);
vpd_blob.ro_base = (uint8_t *)(rdev_mmap_full(&vpd) +
sizeof(struct google_vpd_info));
vpd_blob.ro_size = ro_vpd_size;
}
if (rw_vpd_size) {
if (fmap_locate_area_as_rdev("RW_VPD", &vpd)) {
/* shouldn't happen, but let's be extra defensive */
printk(BIOS_ERR, "%s: No RW_VPD FMAP section.\n",
__func__);
return;
}
rdev_chain(&vpd, &vpd, GOOGLE_VPD_2_0_OFFSET,
region_device_sz(&vpd) - GOOGLE_VPD_2_0_OFFSET);
vpd_blob.rw_base = (uint8_t *)(rdev_mmap_full(&vpd) +
sizeof(struct google_vpd_info));
vpd_blob.rw_size = rw_vpd_size;
}
vpd_blob.initialized = true;
}
const struct vpd_blob *vpd_load_blob(void)
{
if (vpd_blob.initialized == false)
vpd_get_blob();
return &vpd_blob;
}
static int vpd_gets_callback(const uint8_t *key, uint32_t key_len,
const uint8_t *value, uint32_t value_len,
void *arg)
{
struct vpd_gets_arg *result = (struct vpd_gets_arg *)arg;
if (key_len != result->key_len ||
memcmp(key, result->key, key_len) != 0)
/* Returns VPD_DECODE_OK to continue parsing. */
return VPD_DECODE_OK;
result->matched = 1;
result->value = value;
result->value_len = value_len;
/* Returns VPD_DECODE_FAIL to stop parsing. */
return VPD_DECODE_FAIL;
}
const void *vpd_find(const char *key, int *size, enum vpd_region region)
{
struct vpd_blob blob = {0};
vpd_get_buffers(&blob);
if (blob.ro_size == 0 && blob.rw_size == 0)
return NULL;
struct vpd_gets_arg arg = {0};
uint32_t consumed = 0;
arg.key = (const uint8_t *)key;
arg.key_len = strlen(key);
if ((region == VPD_ANY || region == VPD_RO) && blob.ro_size != 0) {
while (vpd_decode_string(blob.ro_size, blob.ro_base,
&consumed, vpd_gets_callback, &arg) == VPD_DECODE_OK) {
/* Iterate until found or no more entries. */
}
}
if ((!arg.matched && region != VPD_RO) && blob.rw_size != 0) {
while (vpd_decode_string(blob.rw_size, blob.rw_base,
&consumed, vpd_gets_callback, &arg) == VPD_DECODE_OK) {
/* Iterate until found or no more entries. */
}
}
if (!arg.matched)
return NULL;
*size = arg.value_len;
return arg.value;
}
char *vpd_gets(const char *key, char *buffer, int size, enum vpd_region region)
{
const void *string_address;
int string_size;
string_address = vpd_find(key, &string_size, region);
if (!string_address)
return NULL;
assert(size > 0);
int copy_size = MIN(size - 1, string_size);
memcpy(buffer, string_address, copy_size);
buffer[copy_size] = '\0';
return buffer;
}
/*
* Find value of boolean type vpd key.
*
* During the process, necessary checking is done, such as making
* sure the value length is 1, and value is either '1' or '0'.
*/
bool vpd_get_bool(const char *key, enum vpd_region region, uint8_t *val)
{
int size;
const char *value;
value = vpd_find(key, &size, region);
if (!value) {
printk(BIOS_CRIT, "problem returning from vpd_find.\n");
return false;
}
if (size != 1)
return false;
/* Make sure the value is either '1' or '0' */
if (*value == '1') {
*val = 1;
return true;
} else if (*value == '0') {
*val = 0;
return true;
} else
return false;
}
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