| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #include <arch/romstage.h> |
| #include <cbmem.h> |
| #include <console/console.h> |
| #include <cpu/x86/msr.h> |
| #include <cpu/x86/mtrr.h> |
| #include <cpu/x86/smm.h> |
| #include <program_loading.h> |
| #include <reset.h> |
| #include <rmodule.h> |
| #include <security/vboot/vboot_common.h> |
| #include <stage_cache.h> |
| #include <timestamp.h> |
| #include <types.h> |
| |
| static size_t var_mtrr_ctx_size(void) |
| { |
| int mtrr_count = get_var_mtrr_count(); |
| return sizeof(struct var_mtrr_context) + mtrr_count * 2 * sizeof(msr_t); |
| } |
| |
| static int postcar_frame_init(struct postcar_frame *pcf) |
| { |
| memset(pcf, 0, sizeof(*pcf)); |
| |
| struct var_mtrr_context *ctx; |
| |
| ctx = cbmem_add(CBMEM_ID_ROMSTAGE_RAM_STACK, var_mtrr_ctx_size()); |
| if (ctx == NULL) { |
| printk(BIOS_ERR, "Couldn't add var_mtrr_ctx setup in cbmem.\n"); |
| return -1; |
| } |
| |
| pcf->mtrr = ctx; |
| var_mtrr_context_init(pcf->mtrr); |
| |
| return 0; |
| } |
| |
| void postcar_frame_add_mtrr(struct postcar_frame *pcf, |
| uintptr_t addr, size_t size, int type) |
| { |
| var_mtrr_set(pcf->mtrr, addr, size, type); |
| } |
| |
| void postcar_frame_add_romcache(struct postcar_frame *pcf, int type) |
| { |
| if (!CONFIG(BOOT_DEVICE_MEMORY_MAPPED)) |
| return; |
| postcar_frame_add_mtrr(pcf, CACHE_ROM_BASE, CACHE_ROM_SIZE, type); |
| } |
| |
| static void postcar_frame_common_mtrrs(struct postcar_frame *pcf) |
| { |
| if (pcf->skip_common_mtrr) |
| return; |
| |
| /* Cache the ROM as WP just below 4GiB. */ |
| postcar_frame_add_romcache(pcf, MTRR_TYPE_WRPROT); |
| } |
| |
| static void run_postcar_phase(struct postcar_frame *pcf); |
| |
| /* prepare_and_run_postcar() determines the stack to use after |
| * cache-as-ram is torn down as well as the MTRR settings to use. */ |
| void __noreturn prepare_and_run_postcar(void) |
| { |
| struct postcar_frame pcf; |
| |
| if (postcar_frame_init(&pcf)) |
| die("Unable to initialize postcar frame.\n"); |
| |
| fill_postcar_frame(&pcf); |
| |
| postcar_frame_common_mtrrs(&pcf); |
| |
| run_postcar_phase(&pcf); |
| /* We do not return here. */ |
| die("Failed to load postcar\n!"); |
| } |
| |
| static void finalize_load(uintptr_t *reloc_params, uintptr_t mtrr_frame_ptr) |
| { |
| *reloc_params = mtrr_frame_ptr; |
| /* |
| * Signal to rest of system that another update was made to the |
| * postcar program prior to running it. |
| */ |
| prog_segment_loaded((uintptr_t)reloc_params, sizeof(uintptr_t), SEG_FINAL); |
| prog_segment_loaded((uintptr_t)mtrr_frame_ptr, var_mtrr_ctx_size(), SEG_FINAL); |
| } |
| |
| static void load_postcar_cbfs(struct prog *prog, struct postcar_frame *pcf) |
| { |
| struct rmod_stage_load rsl = { |
| .cbmem_id = CBMEM_ID_AFTER_CAR, |
| .prog = prog, |
| }; |
| |
| vboot_run_logic(); |
| |
| if (rmodule_stage_load(&rsl)) |
| die_with_post_code(POST_INVALID_ROM, |
| "Failed to load after CAR program.\n"); |
| |
| /* Set the stack pointer within parameters of the program loaded. */ |
| if (rsl.params == NULL) |
| die_with_post_code(POST_INVALID_ROM, |
| "No parameters found in after CAR program.\n"); |
| |
| finalize_load(rsl.params, (uintptr_t)pcf->mtrr); |
| |
| stage_cache_add(STAGE_POSTCAR, prog); |
| } |
| |
| /* |
| * Cache the TSEG region at the top of ram. This region is |
| * not restricted to SMM mode until SMM has been relocated. |
| * By setting the region to cacheable it provides faster access |
| * when relocating the SMM handler as well as using the TSEG |
| * region for other purposes. |
| */ |
| void postcar_enable_tseg_cache(struct postcar_frame *pcf) |
| { |
| uintptr_t smm_base; |
| size_t smm_size; |
| |
| smm_region(&smm_base, &smm_size); |
| postcar_frame_add_mtrr(pcf, smm_base, smm_size, |
| MTRR_TYPE_WRBACK); |
| } |
| |
| static void postcar_cache_invalid(void) |
| { |
| printk(BIOS_ERR, "postcar cache invalid.\n"); |
| board_reset(); |
| } |
| |
| static void run_postcar_phase(struct postcar_frame *pcf) |
| { |
| struct prog prog = |
| PROG_INIT(PROG_POSTCAR, CONFIG_CBFS_PREFIX "/postcar"); |
| |
| if (resume_from_stage_cache()) { |
| stage_cache_load_stage(STAGE_POSTCAR, &prog); |
| /* This is here to allow platforms to pass different stack |
| parameters between S3 resume and normal boot. On the |
| platforms where the values are the same it's a nop. */ |
| finalize_load(prog.arg, (uintptr_t)pcf->mtrr); |
| |
| if (prog_entry(&prog) == NULL) |
| postcar_cache_invalid(); |
| } else |
| load_postcar_cbfs(&prog, pcf); |
| |
| /* As postcar exist, it's end of romstage here */ |
| timestamp_add_now(TS_ROMSTAGE_END); |
| |
| console_time_report(); |
| |
| prog_set_arg(&prog, cbmem_top()); |
| |
| prog_run(&prog); |
| } |