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/*
* Copyright (c) 2014 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include <console/console.h>
#include <cbmem.h>
#include <fmap.h>
#include <stdlib.h>
#include <string.h>
#include <timestamp.h>
#include "cros_vpd.h"
#include "lib_vpd.h"
#include "vpd_tables.h"
/* Currently we only support Google VPD 2.0, which has a fixed offset. */
enum {
GOOGLE_VPD_2_0_OFFSET = 0x600,
CROSVPD_CBMEM_MAGIC = 0x43524f53,
CROSVPD_CBMEM_VERSION = 0x0001,
};
struct vpd_gets_arg {
const uint8_t *key;
const uint8_t *value;
int32_t key_len, value_len;
int matched;
};
struct vpd_cbmem {
uint32_t magic;
uint32_t version;
uint32_t ro_size;
uint32_t rw_size;
uint8_t blob[0];
/* The blob contains both RO and RW data. It starts with RO (0 ..
* ro_size) and then RW (ro_size .. ro_size+rw_size).
*/
};
/* returns the size of data in a VPD 2.0 formatted fmap region, or 0 */
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 cbmem_add_cros_vpd(int is_recovery)
{
struct region_device vpd;
struct vpd_cbmem *cbmem;
int32_t ro_vpd_base = 0, rw_vpd_base = 0;
int32_t ro_vpd_size, rw_vpd_size;
timestamp_add_now(TS_START_COPYVPD);
ro_vpd_size = get_vpd_size("RO_VPD", &ro_vpd_base);
rw_vpd_size = get_vpd_size("RW_VPD", &rw_vpd_base);
/* no VPD at all? nothing to do then */
if ((ro_vpd_size == 0) && (rw_vpd_size == 0))
return;
cbmem = cbmem_add(CBMEM_ID_VPD, sizeof(*cbmem) + ro_vpd_size +
rw_vpd_size);
if (!cbmem) {
printk(BIOS_ERR, "%s: Failed to allocate CBMEM (%u+%u).\n",
__func__, ro_vpd_size, rw_vpd_size);
return;
}
cbmem->magic = CROSVPD_CBMEM_MAGIC;
cbmem->version = CROSVPD_CBMEM_VERSION;
cbmem->ro_size = 0;
cbmem->rw_size = 0;
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);
if (rdev_readat(&vpd, cbmem->blob, ro_vpd_base, ro_vpd_size) ==
ro_vpd_size) {
cbmem->ro_size = ro_vpd_size;
} else {
printk(BIOS_ERR,
"%s: Reading RO_VPD FMAP section failed.\n",
__func__);
ro_vpd_size = 0;
}
timestamp_add_now(TS_END_COPYVPD_RO);
}
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);
if (rdev_readat(&vpd, cbmem->blob + ro_vpd_size, rw_vpd_base,
rw_vpd_size) == rw_vpd_size) {
cbmem->rw_size = rw_vpd_size;
} else {
printk(BIOS_ERR,
"%s: Reading RW_VPD FMAP section failed.\n",
__func__);
}
timestamp_add_now(TS_END_COPYVPD_RW);
}
}
static int vpd_gets_callback(const uint8_t *key, int32_t key_len,
const uint8_t *value, int32_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_OK to continue parsing. */
return VPD_OK;
result->matched = 1;
result->value = value;
result->value_len = value_len;
/* Returns VPD_FAIL to stop parsing. */
return VPD_FAIL;
}
const void *cros_vpd_find(const char *key, int *size)
{
struct vpd_gets_arg arg = {0};
int consumed = 0;
const struct vpd_cbmem *vpd;
vpd = cbmem_find(CBMEM_ID_VPD);
if (!vpd || !vpd->ro_size)
return NULL;
arg.key = (const uint8_t *)key;
arg.key_len = strlen(key);
while (VPD_OK == decodeVpdString(vpd->ro_size, vpd->blob, &consumed,
vpd_gets_callback, &arg)) {
/* Iterate until found or no more entries. */
}
if (!arg.matched)
return NULL;
*size = arg.value_len;
return arg.value;
}
char *cros_vpd_gets(const char *key, char *buffer, int size)
{
const void *string_address;
int string_size;
string_address = cros_vpd_find(key, &string_size);
if (!string_address)
return NULL;
if (size > (string_size + 1)) {
memcpy(buffer, string_address, string_size);
buffer[string_size] = '\0';
} else {
memcpy(buffer, string_address, size - 1);
buffer[size - 1] = '\0';
}
return buffer;
}
RAMSTAGE_CBMEM_INIT_HOOK(cbmem_add_cros_vpd)
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