diff options
| -rw-r--r-- | src/Kconfig | 11 | ||||
| -rw-r--r-- | src/drivers/efi/option.c | 43 |
2 files changed, 54 insertions, 0 deletions
diff --git a/src/Kconfig b/src/Kconfig index 16f788154f..e35df43c9e 100644 --- a/src/Kconfig +++ b/src/Kconfig @@ -142,6 +142,8 @@ choice prompt "Option backend to use" default USE_MAINBOARD_SPECIFIC_OPTION_BACKEND if HAVE_MAINBOARD_SPECIFIC_OPTION_BACKEND default USE_OPTION_TABLE if NVRAMCUI_SECONDARY_PAYLOAD + default USE_UEFI_VARIABLE_STORE if DRIVERS_EFI_VARIABLE_STORE && \ + PAYLOAD_EDK2 && SMMSTORE_V2 config OPTION_BACKEND_NONE bool "None" @@ -153,6 +155,15 @@ config USE_OPTION_TABLE Enable this option if coreboot shall read options from the "CMOS" NVRAM instead of using hard-coded values. +config USE_UEFI_VARIABLE_STORE + bool "Use UEFI variable-store in SPI flash as option backend" + depends on DRIVERS_EFI_VARIABLE_STORE + depends on SMMSTORE_V2 + help + Enable this option if coreboot shall read/write options from the + SMMSTORE region within the SPI flash. The region must be formatted + by the payload first before it can be used. + config USE_MAINBOARD_SPECIFIC_OPTION_BACKEND bool "Use mainboard-specific option backend" depends on HAVE_MAINBOARD_SPECIFIC_OPTION_BACKEND diff --git a/src/drivers/efi/option.c b/src/drivers/efi/option.c new file mode 100644 index 0000000000..3960cfc76b --- /dev/null +++ b/src/drivers/efi/option.c @@ -0,0 +1,43 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ + +#include <stdlib.h> +#include <string.h> +#include <option.h> +#include <smmstore.h> + +#include <Uefi/UefiBaseType.h> + +#include "efivars.h" + +static const EFI_GUID EficorebootNvDataGuid = { + 0xceae4c1d, 0x335b, 0x4685, { 0xa4, 0xa0, 0xfc, 0x4a, 0x94, 0xee, 0xa0, 0x85 } }; + +unsigned int get_uint_option(const char *name, const unsigned int fallback) +{ + struct region_device rdev; + enum cb_err ret; + uint32_t var; + uint32_t size; + + if (smmstore_lookup_region(&rdev)) + return fallback; + + var = 0; + size = sizeof(var); + ret = efi_fv_get_option(&rdev, &EficorebootNvDataGuid, name, &var, &size); + if (ret != CB_SUCCESS) + return fallback; + + return var; +} + +enum cb_err set_uint_option(const char *name, unsigned int value) +{ + struct region_device rdev; + uint32_t var = value; + + if (smmstore_lookup_region(&rdev)) + return CB_CMOS_OTABLE_DISABLED; + + return efi_fv_set_option(&rdev, &EficorebootNvDataGuid, name, &var, sizeof(var)); +} |