| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #include <bootstate.h> |
| #include <intelblocks/cfg.h> |
| #include <intelblocks/dmi.h> |
| #include <intelblocks/fast_spi.h> |
| #include <intelblocks/pcr.h> |
| #include <intelpch/lockdown.h> |
| #include <soc/pci_devs.h> |
| #include <soc/pcr_ids.h> |
| #include <soc/soc_chip.h> |
| |
| /* |
| * This function will get lockdown config specific to soc. |
| * |
| * Return values: |
| * 0 = CHIPSET_LOCKDOWN_FSP = use FSP's lockdown functionality to lockdown IPs |
| * 1 = CHIPSET_LOCKDOWN_COREBOOT = Use coreboot to lockdown IPs |
| */ |
| int get_lockdown_config(void) |
| { |
| const struct soc_intel_common_config *common_config; |
| common_config = chip_get_common_soc_structure(); |
| |
| return common_config->chipset_lockdown; |
| } |
| |
| static void dmi_lockdown_cfg(void) |
| { |
| /* |
| * GCS reg of DMI |
| * |
| * When set, prevents GCS.BBS from being changed |
| * GCS.BBS: (Boot BIOS Strap) This field determines the destination |
| * of accesses to the BIOS memory range. |
| * Bits Description |
| * "0b": SPI |
| * "1b": LPC/eSPI |
| */ |
| pcr_or8(PID_DMI, PCR_DMI_GCS, PCR_DMI_GCS_BILD); |
| |
| /* |
| * Set Secure Register Lock (SRL) bit in DMI control register to lock |
| * DMI configuration. |
| */ |
| pcr_or32(PID_DMI, PCR_DMI_DMICTL, PCR_DMI_DMICTL_SRLOCK); |
| } |
| |
| static void fast_spi_lockdown_cfg(int chipset_lockdown) |
| { |
| if (!CONFIG(SOC_INTEL_COMMON_BLOCK_FAST_SPI)) |
| return; |
| |
| /* Set FAST_SPI opcode menu */ |
| fast_spi_set_opcode_menu(); |
| |
| /* Discrete Lock Flash PR registers */ |
| fast_spi_pr_dlock(); |
| |
| /* Lock FAST_SPIBAR */ |
| fast_spi_lock_bar(); |
| |
| /* Set BIOS Interface Lock, BIOS Lock */ |
| if (chipset_lockdown == CHIPSET_LOCKDOWN_COREBOOT) { |
| /* BIOS Interface Lock */ |
| fast_spi_set_bios_interface_lock_down(); |
| |
| /* Only allow writes in SMM */ |
| if (CONFIG(BOOTMEDIA_SMM_BWP)) { |
| fast_spi_set_eiss(); |
| fast_spi_enable_wp(); |
| } |
| |
| /* BIOS Lock */ |
| fast_spi_set_lock_enable(); |
| |
| /* EXT BIOS Lock */ |
| fast_spi_set_ext_bios_lock_enable(); |
| } |
| } |
| |
| /* |
| * platform_lockdown_config has 2 major part. |
| * 1. Common SoC lockdown configuration. |
| * 2. SoC specific lockdown configuration as per Silicon |
| * guideline. |
| */ |
| static void platform_lockdown_config(void *unused) |
| { |
| int chipset_lockdown; |
| chipset_lockdown = get_lockdown_config(); |
| |
| /* SPI lock down configuration */ |
| fast_spi_lockdown_cfg(chipset_lockdown); |
| |
| /* DMI lock down configuration */ |
| dmi_lockdown_cfg(); |
| |
| /* SoC lock down configuration */ |
| soc_lockdown_config(chipset_lockdown); |
| } |
| |
| BOOT_STATE_INIT_ENTRY(BS_DEV_RESOURCES, BS_ON_EXIT, platform_lockdown_config, |
| NULL); |