| /* |
| * This file is part of the coreboot project. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; version 2 of the License. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| */ |
| |
| #include <bootblock_common.h> |
| #include <console/console.h> |
| #include <cpu/intel/romstage.h> |
| #include <cpu/x86/mtrr.h> |
| #include <cpu/x86/smm.h> |
| #include <arch/symbols.h> |
| #include <commonlib/helpers.h> |
| #include <program_loading.h> |
| #include <timestamp.h> |
| |
| /* If we do not have a constrained _car_stack region size, use the |
| following as a guideline for acceptable stack usage. */ |
| #define DCACHE_RAM_ROMSTAGE_STACK_SIZE 0x2000 |
| |
| static struct postcar_frame early_mtrrs; |
| |
| /* prepare_and_run_postcar() determines the stack to use after |
| * cache-as-ram is torn down as well as the MTRR settings to use. */ |
| static void prepare_and_run_postcar(struct postcar_frame *pcf) |
| { |
| if (postcar_frame_init(pcf, 0)) |
| 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. */ |
| } |
| |
| static void romstage_main(unsigned long bist) |
| { |
| int i; |
| const int num_guards = 64; |
| const u32 stack_guard = 0xdeadbeef; |
| u32 *stack_base; |
| u32 size; |
| const size_t stack_size = MAX(CONFIG_DCACHE_BSP_STACK_SIZE, |
| DCACHE_RAM_ROMSTAGE_STACK_SIZE); |
| |
| /* Size of unallocated CAR. */ |
| size = ALIGN_DOWN(_car_stack_size, 16); |
| |
| size = MIN(size, stack_size); |
| if (size < stack_size) |
| printk(BIOS_DEBUG, "Romstage stack size limited to 0x%x!\n", |
| size); |
| |
| stack_base = (u32 *) (_car_stack_end - size); |
| |
| for (i = 0; i < num_guards; i++) |
| stack_base[i] = stack_guard; |
| |
| mainboard_romstage_entry(); |
| |
| /* Check the stack. */ |
| for (i = 0; i < num_guards; i++) { |
| if (stack_base[i] == stack_guard) |
| continue; |
| printk(BIOS_DEBUG, "Smashed stack detected in romstage!\n"); |
| } |
| |
| if (CONFIG(SMM_TSEG)) |
| smm_list_regions(); |
| |
| prepare_and_run_postcar(&early_mtrrs); |
| /* We do not return here. */ |
| } |
| |
| #if !CONFIG(C_ENVIRONMENT_BOOTBLOCK) |
| /* This wrapper enables easy transition towards C_ENVIRONMENT_BOOTBLOCK, |
| * keeping changes in cache_as_ram.S easy to manage. |
| */ |
| asmlinkage void bootblock_c_entry_bist(uint64_t base_timestamp, uint32_t bist) |
| { |
| timestamp_init(base_timestamp); |
| timestamp_add_now(TS_START_ROMSTAGE); |
| romstage_main(bist); |
| } |
| #endif |
| |
| |
| /* We don't carry BIST from bootblock in a good location to read from. |
| * Any error should have been reported in bootblock already. |
| */ |
| #define NO_BIST 0 |
| |
| asmlinkage void car_stage_entry(void) |
| { |
| /* Assumes the hardware was set up during the bootblock */ |
| console_init(); |
| |
| romstage_main(NO_BIST); |
| } |