| /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| |
| #include <acpi/acpi.h> |
| #include <assert.h> |
| #include <boot_device.h> |
| #include <commonlib/region.h> |
| #include <console/console.h> |
| #include <fmap.h> |
| #include <soc/mrc_cache.h> |
| #include <spi_flash.h> |
| #include <stdint.h> |
| #include <string.h> |
| |
| #define DEFAULT_MRC_CACHE "RW_MRC_CACHE" |
| /* PSP requires this value to be 64KiB */ |
| #define DEFAULT_MRC_CACHE_SIZE 0x10000 |
| |
| #if !CONFIG_PSP_APOB_DRAM_ADDRESS |
| #error Incorrect APOB configuration setting(s) |
| #endif |
| |
| #define APOB_SIGNATURE 0x424F5041 /* 'APOB' */ |
| |
| /* APOB_BASE_HEADER from AGESA */ |
| struct apob_base_header { |
| uint32_t signature; /* APOB signature */ |
| uint32_t version; /* Version */ |
| uint32_t size; /* APOB Size */ |
| uint32_t offset_of_first_entry; /* APOB Header Size */ |
| }; |
| |
| static bool apob_header_valid(const struct apob_base_header *apob_header_ptr, const char *where) |
| { |
| if (apob_header_ptr->signature != APOB_SIGNATURE) { |
| printk(BIOS_WARNING, "Invalid %s APOB signature %x\n", |
| where, apob_header_ptr->signature); |
| return false; |
| } |
| |
| if (apob_header_ptr->size == 0 || apob_header_ptr->size > DEFAULT_MRC_CACHE_SIZE) { |
| printk(BIOS_WARNING, "%s APOB data is too large %x > %x\n", |
| where, apob_header_ptr->size, DEFAULT_MRC_CACHE_SIZE); |
| return false; |
| } |
| |
| return true; |
| } |
| |
| static void *get_apob_dram_address(void) |
| { |
| /* |
| * TODO: Find the APOB destination by parsing the PSP's tables |
| * (once vboot is implemented). |
| */ |
| void *apob_src_ram = (void *)(uintptr_t)CONFIG_PSP_APOB_DRAM_ADDRESS; |
| |
| if (apob_header_valid(apob_src_ram, "RAM") == false) |
| return NULL; |
| |
| return apob_src_ram; |
| } |
| |
| static int get_nv_region(struct region *r) |
| { |
| if (fmap_locate_area(DEFAULT_MRC_CACHE, r) < 0) { |
| printk(BIOS_ERR, "Error: No APOB NV region is found in flash\n"); |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| static void *get_apob_from_nv_region(struct region *region) |
| { |
| struct region_device read_rdev; |
| struct apob_base_header apob_header; |
| |
| if (boot_device_ro_subregion(region, &read_rdev) < 0) { |
| printk(BIOS_ERR, "Failed boot_device_ro_subregion\n"); |
| return NULL; |
| } |
| |
| if (rdev_readat(&read_rdev, &apob_header, 0, sizeof(apob_header)) < 0) { |
| printk(BIOS_ERR, "Couldn't read APOB header!\n"); |
| return NULL; |
| } |
| |
| if (apob_header_valid(&apob_header, "ROM") == false) { |
| printk(BIOS_ERR, "No APOB NV data!\n"); |
| return NULL; |
| } |
| |
| assert(CONFIG(BOOT_DEVICE_MEMORY_MAPPED)); |
| return rdev_mmap_full(&read_rdev); |
| } |
| |
| /* Save APOB buffer to flash */ |
| void soc_update_mrc_cache(void) |
| { |
| struct apob_base_header *apob_rom; |
| struct region_device write_rdev; |
| struct region region; |
| bool update_needed = false; |
| const struct apob_base_header *apob_src_ram; |
| |
| /* Nothing to update in case of S3 resume. */ |
| if (acpi_is_wakeup_s3()) |
| return; |
| |
| apob_src_ram = get_apob_dram_address(); |
| if (apob_src_ram == NULL) |
| return; |
| |
| if (get_nv_region(®ion) != 0) |
| return; |
| |
| apob_rom = get_apob_from_nv_region(®ion); |
| if (apob_rom == NULL) { |
| update_needed = true; |
| } else if (memcmp(apob_src_ram, apob_rom, apob_src_ram->size)) { |
| printk(BIOS_INFO, "APOB RAM copy differs from flash\n"); |
| update_needed = true; |
| } else |
| printk(BIOS_DEBUG, "APOB valid copy is already in flash\n"); |
| |
| if (!update_needed) |
| return; |
| |
| printk(BIOS_SPEW, "Copy APOB from RAM 0x%p/0x%x to flash 0x%zx/0x%zx\n", |
| apob_src_ram, apob_src_ram->size, |
| region_offset(®ion), region_sz(®ion)); |
| |
| if (boot_device_rw_subregion(®ion, &write_rdev) < 0) { |
| printk(BIOS_ERR, "Failed boot_device_rw_subregion\n"); |
| return; |
| } |
| |
| /* write data to flash region */ |
| if (rdev_eraseat(&write_rdev, 0, DEFAULT_MRC_CACHE_SIZE) < 0) { |
| printk(BIOS_ERR, "Error: APOB flash region erase failed\n"); |
| return; |
| } |
| |
| if (rdev_writeat(&write_rdev, apob_src_ram, 0, apob_src_ram->size) < 0) { |
| printk(BIOS_ERR, "Error: APOB flash region update failed\n"); |
| return; |
| } |
| |
| printk(BIOS_INFO, "Updated APOB in flash\n"); |
| } |
| |
| static void *get_apob_nv_address(void) |
| { |
| struct region region; |
| |
| if (get_nv_region(®ion) != 0) |
| return NULL; |
| |
| return get_apob_from_nv_region(®ion); |
| } |
| |
| void *soc_fill_mrc_cache(void) |
| { |
| /* If this is non-S3 boot, then use the APOB data placed by PSP in DRAM. */ |
| if (!acpi_is_wakeup_s3()) |
| return get_apob_dram_address(); |
| |
| /* |
| * In case of S3 resume, PSP does not copy APOB data to DRAM. Thus, coreboot needs to |
| * provide the APOB NV data from RW_MRC_CACHE on SPI flash so that FSP can use it |
| * without having to traverse the BIOS directory table. |
| */ |
| return get_apob_nv_address(); |
| } |