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vendorcode/google/chromeos: Add API to read factory config

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This code leverages the TPM vendor-specific function
tlcl_cr50_get_factory_config() to fetch the device's factory
configuration.

BUG=b:317880956
TEST=Able to retrieve the factory config from google/screebo.

Change-Id: I34f47c9a94972534cda656ef624ef12ed5ddeb06
Signed-off-by: Subrata Banik <subratabanik@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/79737
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kapil Porwal <kapilporwal@google.com>
This commit is contained in:
Subrata Banik
2023-12-27 21:13:25 +05:30
parent 0f90c5d5f9
commit 73505f1f9e
3 changed files with 38 additions and 0 deletions
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1
src/vendorcode/google/chromeos/Makefile.inc
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@@ -9,6 +9,7 @@ ramstage-$(CONFIG_CHROMEOS_DISABLE_PLATFORM_HIERARCHY_ON_RESUME) += tpm2.c
ramstage-$(CONFIG_HAVE_REGULATORY_DOMAIN) += wrdd.c ramstage-$(CONFIG_HAVE_REGULATORY_DOMAIN) += wrdd.c
ramstage-$(CONFIG_USE_SAR) += sar.c ramstage-$(CONFIG_USE_SAR) += sar.c
ramstage-$(CONFIG_TPM_GOOGLE) += cr50_enable_update.c ramstage-$(CONFIG_TPM_GOOGLE) += cr50_enable_update.c
ramstage-$(CONFIG_TPM_GOOGLE) += tpm_factory_config.c
romstage-$(CONFIG_CHROMEOS_CSE_BOARD_RESET_OVERRIDE) += cse_board_reset.c romstage-$(CONFIG_CHROMEOS_CSE_BOARD_RESET_OVERRIDE) += cse_board_reset.c
ramstage-$(CONFIG_CHROMEOS_CSE_BOARD_RESET_OVERRIDE) += cse_board_reset.c ramstage-$(CONFIG_CHROMEOS_CSE_BOARD_RESET_OVERRIDE) += cse_board_reset.c

6
src/vendorcode/google/chromeos/chromeos.h
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@@ -26,6 +26,12 @@ void mainboard_prepare_cr50_reset(void);
void cbmem_add_vpd_calibration_data(void); void cbmem_add_vpd_calibration_data(void);
void chromeos_set_me_hash(u32*, int); void chromeos_set_me_hash(u32*, int);
void chromeos_set_ramoops(void *ram_oops, size_t size); void chromeos_set_ramoops(void *ram_oops, size_t size);
/*
* The factory config space is a one-time programmable info page.
* For the unprovisioned one, the read will be 0x0.
* Return `-1` in case of error.
*/
int64_t chromeos_get_factory_config(void);
/* /*
* Declaration for mainboards to use to generate ACPI-specific ChromeOS needs. * Declaration for mainboards to use to generate ACPI-specific ChromeOS needs.

31
src/vendorcode/google/chromeos/tpm_factory_config.c Normal file
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@@ -0,0 +1,31 @@
/* SPDX-License-Identifier: GPL-2.0-only */
#include <console/console.h>
#include <security/tpm/tss.h>
#include <vendorcode/google/chromeos/chromeos.h>
int64_t chromeos_get_factory_config(void)
{
static int64_t factory_config = -1;
if (factory_config >= 0)
return factory_config;
/* Initialize TPM driver. */
tpm_result_t rc = tlcl_lib_init();
if (rc != TPM_SUCCESS) {
printk(BIOS_ERR, "%s:%d - tlcl_lib_init() failed: %#x\n",
__func__, __LINE__, rc);
return -1;
}
rc = tlcl_cr50_get_factory_config((uint64_t *)&factory_config);
if (rc != TPM_SUCCESS) {
printk(BIOS_ERR, "%s:%d - tlcl_cr50_get_factory_config() failed: %#x\n",
__func__, __LINE__, rc);
return -1;
}
return factory_config;
}