/* Fill in active EC firmware information. */
static int set_active_ec_firmware(crossystem_data_t* cdata)
{
int in_rw = 0;
int rv;
/* If software sync is disabled, just leave this as original value. */
if (!cros_fdtdec_config_has_prop(gd->fdt_blob, "ec-software-sync")) {
cdata->active_ec_firmware = ACTIVE_EC_FIRMWARE_UNCHANGE;
return 0;
}
rv = VbExEcRunningRW(&in_rw);
if (rv != VBERROR_SUCCESS)
return rv;
cdata->active_ec_firmware = (in_rw ? ACTIVE_EC_FIRMWARE_RW :
ACTIVE_EC_FIRMWARE_RO);
return 0;
}
int crossystem_setup(void)
{
chromeos_acpi_t *acpi_table = (chromeos_acpi_t *)lib_sysinfo.vdat_addr;
VbSharedDataHeader *vboot_handoff_shared_data;
VbSharedDataHeader *vdat = (VbSharedDataHeader *)&acpi_table->vdat;
int size;
if (vdat->magic != VB_SHARED_DATA_MAGIC) {
printf("Bad magic value in vboot shared data header.\n");
return 1;
}
acpi_table->boot_reason = BOOT_REASON_OTHER;
int main_fw;
const char *fwid;
int fwid_size;
int fw_index = vdat->firmware_index;
fwid = get_fw_id(fw_index);
if (fwid == NULL) {
printf("Unrecognized firmware index %d.\n", fw_index);
return 1;
}
fwid_size = get_fw_size(fw_index);
const struct {
int vdat_fw_index;
int main_fw_index;
} main_fw_arr[] = {
{ VDAT_RW_A, BINF_RW_A },
{ VDAT_RW_B, BINF_RW_B },
{ VDAT_RECOVERY, BINF_RECOVERY },
};
int i;
for (i = 0; i < ARRAY_SIZE(main_fw_arr); i++) {
if (fw_index == main_fw_arr[i].vdat_fw_index) {
main_fw = main_fw_arr[i].main_fw_index;
break;
}
}
assert(i < ARRAY_SIZE(main_fw_arr));
acpi_table->main_fw = main_fw;
// Use the value set by coreboot if we don't want to change it.
if (CONFIG_EC_SOFTWARE_SYNC) {
int in_rw = 0;
if (VbExEcRunningRW(0, &in_rw)) {
printf("Couldn't tell if the EC firmware is RW.\n");
return 1;
}
acpi_table->ec_fw = in_rw ? ACTIVE_ECFW_RW : ACTIVE_ECFW_RO;
}
uint16_t chsw = 0;
if (flag_fetch(FLAG_WPSW))
chsw |= CHSW_FIRMWARE_WP_DIS;
if (flag_fetch(FLAG_RECSW))
chsw |= CHSW_RECOVERY_X86;
if (flag_fetch(FLAG_DEVSW))
chsw |= CHSW_DEVELOPER_SWITCH;
acpi_table->chsw = chsw;
GoogleBinaryBlockHeader *gbb = cparams.gbb_data;
if (memcmp(gbb->signature, GBB_SIGNATURE, GBB_SIGNATURE_SIZE)) {
printf("Bad signature on GBB.\n");
return 1;
}
char *hwid = (char *)((uintptr_t)cparams.gbb_data + gbb->hwid_offset);
size = MIN(gbb->hwid_size, sizeof(acpi_table->hwid));
memcpy(acpi_table->hwid, hwid, size);
size = MIN(fwid_size, sizeof(acpi_table->fwid));
memcpy(acpi_table->fwid, fwid, size);
size = get_ro_fw_size();
if (size) {
size = MIN(size, sizeof(acpi_table->frid));
memcpy(acpi_table->frid, get_ro_fw_id(), size);
}
if (main_fw == BINF_RECOVERY)
acpi_table->main_fw_type = FIRMWARE_TYPE_RECOVERY;
else if (vdat->flags & VBSD_BOOT_DEV_SWITCH_ON)
acpi_table->main_fw_type = FIRMWARE_TYPE_DEVELOPER;
else
acpi_table->main_fw_type = FIRMWARE_TYPE_NORMAL;
acpi_table->recovery_reason = vdat->recovery_reason;
acpi_table->fmap_base = (uintptr_t)fmap_base();
size = MIN(fwid_size, strnlen(fwid, ACPI_FWID_SIZE));
uint8_t *dest = (uint8_t *)(uintptr_t)acpi_table->fwid_ptr;
memcpy(dest, fwid, size);
dest[size] = 0;
// Synchronize the value in vboot_handoff back to acpi vdat.
if (find_common_params((void**)(&vboot_handoff_shared_data), &size) == 0)
memcpy(vdat, vboot_handoff_shared_data, size);
else {
printf("Can't find common params.\n");
return 1;
}
return 0;
}
VbError_t VbEcSoftwareSync(int devidx, VbCommonParams *cparams)
{
VbSharedDataHeader *shared =
(VbSharedDataHeader *)cparams->shared_data_blob;
int in_rw = 0;
int rv;
const uint8_t *ec_hash = NULL;
int ec_hash_size;
const uint8_t *rw_hash = NULL;
int rw_hash_size;
const uint8_t *expected = NULL;
int expected_size;
uint8_t expected_hash[SHA256_DIGEST_SIZE];
int need_update = 0;
int i;
VBDEBUG(("VbEcSoftwareSync(devidx=%d)\n", devidx));
/* Determine whether the EC is in RO or RW */
rv = VbExEcRunningRW(devidx, &in_rw);
if (shared->recovery_reason) {
/* Recovery mode; just verify the EC is in RO code */
if (rv == VBERROR_SUCCESS && in_rw == 1) {
/*
* EC is definitely in RW firmware. We want it in
* read-only code, so preserve the current recovery
* reason and reboot.
*
* We don't reboot on error or unknown EC code, because
* we could end up in an endless reboot loop. If we
* had some way to track that we'd already rebooted for
* this reason, we could retry only once.
*/
VBDEBUG(("VbEcSoftwareSync() - "
"want recovery but got EC-RW\n"));
VbSetRecoveryRequest(shared->recovery_reason);
return VBERROR_EC_REBOOT_TO_RO_REQUIRED;
}
VBDEBUG(("VbEcSoftwareSync() in recovery; EC-RO\n"));
return VBERROR_SUCCESS;
}
/*
* Not in recovery. If we couldn't determine where the EC was,
* reboot to recovery.
*/
if (rv != VBERROR_SUCCESS) {
VBDEBUG(("VbEcSoftwareSync() - "
"VbExEcRunningRW() returned %d\n", rv));
VbSetRecoveryRequest(VBNV_RECOVERY_EC_UNKNOWN_IMAGE);
return VBERROR_EC_REBOOT_TO_RO_REQUIRED;
}
/* If AP is read-only normal, EC should be in its RO code also. */
if (shared->flags & VBSD_LF_USE_RO_NORMAL) {
/* If EC is in RW code, request reboot back to RO */
if (in_rw == 1) {
VBDEBUG(("VbEcSoftwareSync() - "
"want RO-normal but got EC-RW\n"));
return VBERROR_EC_REBOOT_TO_RO_REQUIRED;
}
/* Protect the RW flash and stay in EC-RO */
rv = EcProtectRW(devidx);
if (rv != VBERROR_SUCCESS)
return rv;
rv = VbExEcDisableJump(devidx);
if (rv != VBERROR_SUCCESS) {
VBDEBUG(("VbEcSoftwareSync() - "
"VbExEcDisableJump() returned %d\n", rv));
VbSetRecoveryRequest(VBNV_RECOVERY_EC_SOFTWARE_SYNC);
return VBERROR_EC_REBOOT_TO_RO_REQUIRED;
}
VBDEBUG(("VbEcSoftwareSync() in RO-Normal; EC-RO\n"));
return VBERROR_SUCCESS;
}
/* Get hash of EC-RW */
rv = VbExEcHashRW(devidx, &ec_hash, &ec_hash_size);
if (rv) {
VBDEBUG(("VbEcSoftwareSync() - "
"VbExEcHashRW() returned %d\n", rv));
VbSetRecoveryRequest(VBNV_RECOVERY_EC_HASH_FAILED);
return VBERROR_EC_REBOOT_TO_RO_REQUIRED;
}
if (ec_hash_size != SHA256_DIGEST_SIZE) {
VBDEBUG(("VbEcSoftwareSync() - "
"VbExEcHashRW() says size %d, not %d\n",
ec_hash_size, SHA256_DIGEST_SIZE));
VbSetRecoveryRequest(VBNV_RECOVERY_EC_HASH_SIZE);
return VBERROR_EC_REBOOT_TO_RO_REQUIRED;
}
VBDEBUG(("EC hash:"));
for (i = 0; i < SHA256_DIGEST_SIZE; i++)
VBDEBUG(("%02x", ec_hash[i]));
VBDEBUG(("\n"));
/*
* Get expected EC-RW hash. Note that we've already checked for
* RO_NORMAL, so we know that the BIOS must be RW-A or RW-B, and
* therefore the EC must match.
*/
rv = VbExEcGetExpectedRWHash(devidx, shared->firmware_index ?
VB_SELECT_FIRMWARE_B : VB_SELECT_FIRMWARE_A,
&rw_hash, &rw_hash_size);
if (rv == VBERROR_EC_GET_EXPECTED_HASH_FROM_IMAGE) {
/*
* BIOS has verified EC image but doesn't have a precomputed
* hash for it, so we must compute the hash ourselves.
*/
rw_hash = NULL;
} else if (rv) {
VBDEBUG(("VbEcSoftwareSync() - "
"VbExEcGetExpectedRWHash() returned %d\n", rv));
VbSetRecoveryRequest(VBNV_RECOVERY_EC_EXPECTED_HASH);
return VBERROR_EC_REBOOT_TO_RO_REQUIRED;
} else if (rw_hash_size != SHA256_DIGEST_SIZE) {
VBDEBUG(("VbEcSoftwareSync() - "
"VbExEcGetExpectedRWHash() says size %d, not %d\n",
rw_hash_size, SHA256_DIGEST_SIZE));
VbSetRecoveryRequest(VBNV_RECOVERY_EC_EXPECTED_HASH);
return VBERROR_EC_REBOOT_TO_RO_REQUIRED;
} else {
VBDEBUG(("Expected hash:"));
for (i = 0; i < SHA256_DIGEST_SIZE; i++)
VBDEBUG(("%02x", rw_hash[i]));
VBDEBUG(("\n"));
need_update = SafeMemcmp(ec_hash, rw_hash, SHA256_DIGEST_SIZE);
}
/*
* Get expected EC-RW image if we're sure we need to update (because the
* expected hash didn't match the EC) or we still don't know (because
* there was no expected hash and we need the image to compute one
* ourselves).
*/
if (need_update || !rw_hash) {
/* Get expected EC-RW image */
rv = VbExEcGetExpectedRW(devidx, shared->firmware_index ?
VB_SELECT_FIRMWARE_B :
VB_SELECT_FIRMWARE_A,
&expected, &expected_size);
if (rv) {
VBDEBUG(("VbEcSoftwareSync() - "
"VbExEcGetExpectedRW() returned %d\n", rv));
VbSetRecoveryRequest(VBNV_RECOVERY_EC_EXPECTED_IMAGE);
return VBERROR_EC_REBOOT_TO_RO_REQUIRED;
}
VBDEBUG(("VbEcSoftwareSync() - expected len = %d\n",
expected_size));
/* Hash expected image */
internal_SHA256(expected, expected_size, expected_hash);
VBDEBUG(("Computed hash of expected image:"));
for (i = 0; i < SHA256_DIGEST_SIZE; i++)
VBDEBUG(("%02x", expected_hash[i]));
VBDEBUG(("\n"));
}
if (!rw_hash) {
/*
* BIOS didn't have expected EC hash, so check if we need
* update by comparing EC hash to the one we just computed.
*/
need_update = SafeMemcmp(ec_hash, expected_hash,
SHA256_DIGEST_SIZE);
} else if (need_update &&
SafeMemcmp(rw_hash, expected_hash, SHA256_DIGEST_SIZE)) {
/*
* We need to update, but the expected EC image doesn't match
* the expected EC hash we were given.
*/
VBDEBUG(("VbEcSoftwareSync() - "
"VbExEcGetExpectedRW() returned %d\n", rv));
VbSetRecoveryRequest(VBNV_RECOVERY_EC_HASH_MISMATCH);
return VBERROR_EC_REBOOT_TO_RO_REQUIRED;
}
/*
* TODO: GBB flag to override whether we need update; needed for EC
* development.
*/
if (in_rw) {
if (need_update) {
/*
* Check if BIOS should also load VGA Option ROM when
* rebooting to save another reboot if possible.
*/
if ((shared->flags & VBSD_EC_SLOW_UPDATE) &&
(shared->flags & VBSD_OPROM_MATTERS) &&
!(shared->flags & VBSD_OPROM_LOADED)) {
VBDEBUG(("VbEcSoftwareSync() - Reboot to "
"load VGA Option ROM\n"));
VbNvSet(&vnc, VBNV_OPROM_NEEDED, 1);
}
/*
* EC is running the wrong RW image. Reboot the EC to
* RO so we can update it on the next boot.
*/
VBDEBUG(("VbEcSoftwareSync() - "
"in RW, need to update RW, so reboot\n"));
return VBERROR_EC_REBOOT_TO_RO_REQUIRED;
}
VBDEBUG(("VbEcSoftwareSync() in EC-RW and it matches\n"));
return VBERROR_SUCCESS;
}
/* Update EC if necessary */
if (need_update) {
VBDEBUG(("VbEcSoftwareSync() updating EC-RW...\n"));
if (shared->flags & VBSD_EC_SLOW_UPDATE) {
VBDEBUG(("VbEcSoftwareSync() - "
"EC is slow. Show WAIT screen.\n"));
/* Ensure the VGA Option ROM is loaded */
if ((shared->flags & VBSD_OPROM_MATTERS) &&
!(shared->flags & VBSD_OPROM_LOADED)) {
VBDEBUG(("VbEcSoftwareSync() - Reboot to "
"load VGA Option ROM\n"));
VbNvSet(&vnc, VBNV_OPROM_NEEDED, 1);
return VBERROR_VGA_OPROM_MISMATCH;
}
VbDisplayScreen(cparams, VB_SCREEN_WAIT, 0, &vnc);
}
rv = VbExEcUpdateRW(devidx, expected, expected_size);
if (rv != VBERROR_SUCCESS) {
VBDEBUG(("VbEcSoftwareSync() - "
"VbExEcUpdateRW() returned %d\n", rv));
/*
* The EC may know it needs a reboot. It may need to
* unprotect RW before updating, or may need to reboot
* after RW updated. Either way, it's not an error
* requiring recovery mode.
*
* If we fail for any other reason, trigger recovery
* mode.
*/
if (rv != VBERROR_EC_REBOOT_TO_RO_REQUIRED)
VbSetRecoveryRequest(VBNV_RECOVERY_EC_UPDATE);
return VBERROR_EC_REBOOT_TO_RO_REQUIRED;
}
/*
* TODO: should ask EC to recompute its hash to verify it's
* correct before continuing?
*/
}
/* Protect EC-RW flash */
rv = EcProtectRW(devidx);
if (rv != VBERROR_SUCCESS)
return rv;
/* Tell EC to jump to its RW image */
VBDEBUG(("VbEcSoftwareSync() jumping to EC-RW\n"));
rv = VbExEcJumpToRW(devidx);
if (rv != VBERROR_SUCCESS) {
VBDEBUG(("VbEcSoftwareSync() - "
"VbExEcJumpToRW() returned %d\n", rv));
/*
* If the EC booted RO-normal and a previous AP boot has called
* VbExEcStayInRO(), we need to reboot the EC to unlock the
* ability to jump to the RW firmware.
*
* All other errors trigger recovery mode.
*/
if (rv != VBERROR_EC_REBOOT_TO_RO_REQUIRED)
VbSetRecoveryRequest(VBNV_RECOVERY_EC_JUMP_RW);
return VBERROR_EC_REBOOT_TO_RO_REQUIRED;
}
VBDEBUG(("VbEcSoftwareSync() jumped to EC-RW\n"));
rv = VbExEcDisableJump(devidx);
if (rv != VBERROR_SUCCESS) {
VBDEBUG(("VbEcSoftwareSync() - "
"VbExEcDisableJump() returned %d\n", rv));
VbSetRecoveryRequest(VBNV_RECOVERY_EC_SOFTWARE_SYNC);
return VBERROR_EC_REBOOT_TO_RO_REQUIRED;
}
/*
* Reboot to unload VGA Option ROM if:
* - RW update was done
* - the system is NOT in developer mode
* - the system has slow EC update flag set
* - the VGA Option ROM was needed and loaded
*/
if (need_update &&
!(shared->flags & VBSD_BOOT_DEV_SWITCH_ON) &&
(shared->flags & VBSD_EC_SLOW_UPDATE) &&
(shared->flags & VBSD_OPROM_MATTERS) &&
(shared->flags & VBSD_OPROM_LOADED)) {
VBDEBUG(("VbEcSoftwareSync() - Reboot to "
"unload VGA Option ROM\n"));
return VBERROR_VGA_OPROM_MISMATCH;
}
VBDEBUG(("VbEcSoftwareSync() in RW; done\n"));
return VBERROR_SUCCESS;
}