/* SPDX-License-Identifier: BSD-3-Clause */ #include <assert.h> #include <console/console.h> #include <cbmem.h> #include <ctype.h> #include <fmap.h> #include <program_loading.h> #include <string.h> #include <timestamp.h> #include <types.h> #include "vpd.h" #include "vpd_decode.h" #include "vpd_tables.h" /* Currently we only support Google VPD 2.0, which has a fixed offset. */ enum { CROSVPD_CBMEM_MAGIC = 0x43524f53, CROSVPD_CBMEM_VERSION = 0x0001, }; 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). */ }; struct vpd_gets_arg { const uint8_t *key; const uint8_t *value; int32_t key_len, value_len; int matched; }; static struct region_device ro_vpd, rw_vpd; /* * Initializes a region_device to represent the requested VPD 2.0 formatted * region on flash. On errors rdev->size will be set to 0. */ static void init_vpd_rdev(const char *fmap_name, struct region_device *rdev) { struct google_vpd_info info; int32_t size; if (fmap_locate_area_as_rdev(fmap_name, rdev)) { printk(BIOS_WARNING, "%s: No %s FMAP section.\n", __func__, fmap_name); goto fail; } size = region_device_sz(rdev); if ((size < GOOGLE_VPD_2_0_OFFSET + sizeof(info)) || rdev_chain(rdev, rdev, 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); goto fail; } /* Try if we can find a google_vpd_info, otherwise read whole VPD. */ if (rdev_readat(rdev, &info, 0, sizeof(info)) != sizeof(info)) { printk(BIOS_ERR, "Failed to read %s header.\n", fmap_name); goto fail; } if (memcmp(info.header.magic, VPD_INFO_MAGIC, sizeof(info.header.magic)) == 0) { if (rdev_chain(rdev, rdev, sizeof(info), info.size)) { printk(BIOS_ERR, "%s info size too large.\n", fmap_name); goto fail; } } else if (info.header.tlv.type == VPD_TYPE_TERMINATOR || info.header.tlv.type == VPD_TYPE_IMPLICIT_TERMINATOR) { printk(BIOS_WARNING, "%s is uninitialized or empty.\n", fmap_name); goto fail; } return; fail: memset(rdev, 0, sizeof(*rdev)); } static int init_vpd_rdevs_from_cbmem(void) { if (!cbmem_possibly_online()) return -1; struct vpd_cbmem *cbmem = cbmem_find(CBMEM_ID_VPD); if (!cbmem) return -1; rdev_chain_mem(&ro_vpd, cbmem->blob, cbmem->ro_size); rdev_chain_mem(&rw_vpd, cbmem->blob + cbmem->ro_size, cbmem->rw_size); return 0; } static void init_vpd_rdevs(void) { static bool done = false; if (done) return; if (init_vpd_rdevs_from_cbmem() != 0) { init_vpd_rdev("RO_VPD", &ro_vpd); init_vpd_rdev("RW_VPD", &rw_vpd); } done = true; } static void cbmem_add_cros_vpd(int is_recovery) { struct vpd_cbmem *cbmem; timestamp_add_now(TS_COPYVPD_START); init_vpd_rdevs(); /* Return if no VPD at all */ if (region_device_sz(&ro_vpd) == 0 && region_device_sz(&rw_vpd) == 0) return; size_t ro_size = region_device_sz(&ro_vpd); size_t rw_size = region_device_sz(&rw_vpd); cbmem = cbmem_add(CBMEM_ID_VPD, sizeof(*cbmem) + ro_size + rw_size); if (!cbmem) { printk(BIOS_ERR, "%s: Failed to allocate CBMEM (%zu+%zu).\n", __func__, ro_size, rw_size); return; } cbmem->magic = CROSVPD_CBMEM_MAGIC; cbmem->version = CROSVPD_CBMEM_VERSION; cbmem->ro_size = ro_size; cbmem->rw_size = rw_size; if (ro_size) { if (rdev_readat(&ro_vpd, cbmem->blob, 0, ro_size) != ro_size) { printk(BIOS_ERR, "Couldn't read RO VPD\n"); cbmem->ro_size = ro_size = 0; } timestamp_add_now(TS_COPYVPD_RO_END); } if (rw_size) { if (rdev_readat(&rw_vpd, cbmem->blob + ro_size, 0, rw_size) != rw_size) { printk(BIOS_ERR, "Couldn't read RW VPD\n"); cbmem->rw_size = rw_size = 0; } timestamp_add_now(TS_COPYVPD_RW_END); } init_vpd_rdevs_from_cbmem(); } 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; } static void vpd_find_in(struct region_device *rdev, struct vpd_gets_arg *arg) { if (region_device_sz(rdev) == 0) return; uint32_t consumed = 0; void *mapping = rdev_mmap_full(rdev); while (vpd_decode_string(region_device_sz(rdev), mapping, &consumed, vpd_gets_callback, arg) == VPD_DECODE_OK) { /* Iterate until found or no more entries. */ } rdev_munmap(rdev, mapping); } const void *vpd_find(const char *key, int *size, enum vpd_region region) { struct vpd_gets_arg arg = {0}; arg.key = (const uint8_t *)key; arg.key_len = strlen(key); init_vpd_rdevs(); if (region == VPD_RW_THEN_RO) vpd_find_in(&rw_vpd, &arg); if (!arg.matched && (region == VPD_RO || region == VPD_RO_THEN_RW || region == VPD_RW_THEN_RO)) vpd_find_in(&ro_vpd, &arg); if (!arg.matched && (region == VPD_RW || region == VPD_RO_THEN_RW)) vpd_find_in(&rw_vpd, &arg); 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; } /* * Find value of integer type by vpd key. * * Expects to find a decimal string, trailing chars are ignored. * Returns true if the key is found and the value is not too long and * starts with a decimal digit. Leaves `val` untouched if unsuccessful. */ bool vpd_get_int(const char *const key, const enum vpd_region region, int *const val) { char value[11]; if (!vpd_gets(key, value, sizeof(value), region)) return false; if (!isdigit(*value)) return false; *val = (int)atol(value); return true; } CBMEM_CREATION_HOOK(cbmem_add_cros_vpd);