/* * 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)