| /* |
| * This file is part of the coreboot project. |
| * |
| * Copyright (C) 2012 ChromeOS Authors |
| * |
| * 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. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include <stdint.h> |
| #include <string.h> |
| #include <cbmem.h> |
| #include <console/console.h> |
| #include <arch/cpu.h> |
| #include <cpu/x86/bist.h> |
| #include <cpu/x86/msr.h> |
| #include <cpu/x86/mtrr.h> |
| #include <halt.h> |
| #include <lib.h> |
| #include <timestamp.h> |
| #include <arch/io.h> |
| #include <arch/stages.h> |
| #include <device/pci_def.h> |
| #include <cpu/x86/lapic.h> |
| #include <cbfs.h> |
| #include <ramstage_cache.h> |
| #include <romstage_handoff.h> |
| #include <reset.h> |
| #include <vendorcode/google/chromeos/chromeos.h> |
| #if CONFIG_EC_GOOGLE_CHROMEEC |
| #include <ec/google/chromeec/ec.h> |
| #endif |
| #include "haswell.h" |
| #include "northbridge/intel/haswell/haswell.h" |
| #include "northbridge/intel/haswell/raminit.h" |
| #include "southbridge/intel/lynxpoint/pch.h" |
| #include "southbridge/intel/lynxpoint/me.h" |
| |
| |
| static inline void reset_system(void) |
| { |
| hard_reset(); |
| halt(); |
| } |
| |
| /* The cache-as-ram assembly file calls romstage_main() after setting up |
| * cache-as-ram. romstage_main() will then call the mainboards's |
| * mainboard_romstage_entry() function. That function then calls |
| * romstage_common() below. The reason for the back and forth is to provide |
| * common entry point from cache-as-ram while still allowing for code sharing. |
| * Because we can't use global variables the stack is used for allocations -- |
| * thus the need to call back and forth. */ |
| |
| |
| static inline u32 *stack_push(u32 *stack, u32 value) |
| { |
| stack = &stack[-1]; |
| *stack = value; |
| return stack; |
| } |
| |
| /* Romstage needs quite a bit of stack for decompressing images since the lzma |
| * lib keeps its state on the stack during romstage. */ |
| #define ROMSTAGE_RAM_STACK_SIZE 0x5000 |
| static unsigned long choose_top_of_stack(void) |
| { |
| unsigned long stack_top; |
| #if CONFIG_DYNAMIC_CBMEM |
| /* cbmem_add() does a find() before add(). */ |
| stack_top = (unsigned long)cbmem_add(CBMEM_ID_ROMSTAGE_RAM_STACK, |
| ROMSTAGE_RAM_STACK_SIZE); |
| stack_top += ROMSTAGE_RAM_STACK_SIZE; |
| #else |
| stack_top = CONFIG_RAMTOP; |
| #endif |
| return stack_top; |
| } |
| |
| /* setup_romstage_stack_after_car() determines the stack to use after |
| * cache-as-ram is torn down as well as the MTRR settings to use. */ |
| static void *setup_romstage_stack_after_car(void) |
| { |
| unsigned long top_of_stack; |
| int num_mtrrs; |
| u32 *slot; |
| u32 mtrr_mask_upper; |
| u32 top_of_ram; |
| |
| /* Top of stack needs to be aligned to a 4-byte boundary. */ |
| top_of_stack = choose_top_of_stack() & ~3; |
| slot = (void *)top_of_stack; |
| num_mtrrs = 0; |
| |
| /* The upper bits of the MTRR mask need to set according to the number |
| * of physical address bits. */ |
| mtrr_mask_upper = (1 << ((cpuid_eax(0x80000008) & 0xff) - 32)) - 1; |
| |
| /* The order for each MTRR is value then base with upper 32-bits of |
| * each value coming before the lower 32-bits. The reasoning for |
| * this ordering is to create a stack layout like the following: |
| * +0: Number of MTRRs |
| * +4: MTRR base 0 31:0 |
| * +8: MTRR base 0 63:32 |
| * +12: MTRR mask 0 31:0 |
| * +16: MTRR mask 0 63:32 |
| * +20: MTRR base 1 31:0 |
| * +24: MTRR base 1 63:32 |
| * +28: MTRR mask 1 31:0 |
| * +32: MTRR mask 1 63:32 |
| */ |
| |
| /* Cache the ROM as WP just below 4GiB. */ |
| slot = stack_push(slot, mtrr_mask_upper); /* upper mask */ |
| slot = stack_push(slot, ~(CACHE_ROM_SIZE - 1) | MTRRphysMaskValid); |
| slot = stack_push(slot, 0); /* upper base */ |
| slot = stack_push(slot, ~(CACHE_ROM_SIZE - 1) | MTRR_TYPE_WRPROT); |
| num_mtrrs++; |
| |
| /* Cache RAM as WB from 0 -> CONFIG_RAMTOP. */ |
| slot = stack_push(slot, mtrr_mask_upper); /* upper mask */ |
| slot = stack_push(slot, ~(CONFIG_RAMTOP - 1) | MTRRphysMaskValid); |
| slot = stack_push(slot, 0); /* upper base */ |
| slot = stack_push(slot, 0 | MTRR_TYPE_WRBACK); |
| num_mtrrs++; |
| |
| top_of_ram = (uint32_t)cbmem_top(); |
| /* Cache 8MiB below the top of ram. On haswell systems the top of |
| * ram under 4GiB is the start of the TSEG region. It is required to |
| * be 8MiB aligned. Set this area as cacheable so it can be used later |
| * for ramstage before setting up the entire RAM as cacheable. */ |
| slot = stack_push(slot, mtrr_mask_upper); /* upper mask */ |
| slot = stack_push(slot, ~((8 << 20) - 1) | MTRRphysMaskValid); |
| slot = stack_push(slot, 0); /* upper base */ |
| slot = stack_push(slot, (top_of_ram - (8 << 20)) | MTRR_TYPE_WRBACK); |
| num_mtrrs++; |
| |
| /* Cache 8MiB at the top of ram. Top of ram on haswell systems |
| * is where the TSEG region resides. However, it 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. */ |
| slot = stack_push(slot, mtrr_mask_upper); /* upper mask */ |
| slot = stack_push(slot, ~((8 << 20) - 1) | MTRRphysMaskValid); |
| slot = stack_push(slot, 0); /* upper base */ |
| slot = stack_push(slot, top_of_ram | MTRR_TYPE_WRBACK); |
| num_mtrrs++; |
| |
| /* Save the number of MTRRs to setup. Return the stack location |
| * pointing to the number of MTRRs. */ |
| slot = stack_push(slot, num_mtrrs); |
| |
| return slot; |
| } |
| |
| void * asmlinkage romstage_main(unsigned long bist) |
| { |
| int i; |
| void *romstage_stack_after_car; |
| const int num_guards = 4; |
| const u32 stack_guard = 0xdeadbeef; |
| u32 *stack_base = (void *)(CONFIG_DCACHE_RAM_BASE + |
| CONFIG_DCACHE_RAM_SIZE - |
| CONFIG_DCACHE_RAM_ROMSTAGE_STACK_SIZE); |
| |
| printk(BIOS_DEBUG, "Setting up stack guards.\n"); |
| for (i = 0; i < num_guards; i++) |
| stack_base[i] = stack_guard; |
| |
| mainboard_romstage_entry(bist); |
| |
| /* 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"); |
| } |
| |
| /* Get the stack to use after cache-as-ram is torn down. */ |
| romstage_stack_after_car = setup_romstage_stack_after_car(); |
| |
| return romstage_stack_after_car; |
| } |
| |
| void romstage_common(const struct romstage_params *params) |
| { |
| int boot_mode; |
| int wake_from_s3; |
| struct romstage_handoff *handoff; |
| |
| timestamp_init(get_initial_timestamp()); |
| timestamp_add_now(TS_START_ROMSTAGE); |
| |
| if (params->bist == 0) |
| enable_lapic(); |
| |
| wake_from_s3 = early_pch_init(params->gpio_map, params->rcba_config); |
| |
| #if CONFIG_EC_GOOGLE_CHROMEEC |
| /* Ensure the EC is in the right mode for recovery */ |
| google_chromeec_early_init(); |
| #endif |
| |
| /* Halt if there was a built in self test failure */ |
| report_bist_failure(params->bist); |
| |
| /* Perform some early chipset initialization required |
| * before RAM initialization can work |
| */ |
| haswell_early_initialization(HASWELL_MOBILE); |
| printk(BIOS_DEBUG, "Back from haswell_early_initialization()\n"); |
| |
| if (wake_from_s3) { |
| #if CONFIG_HAVE_ACPI_RESUME |
| printk(BIOS_DEBUG, "Resume from S3 detected.\n"); |
| #else |
| printk(BIOS_DEBUG, "Resume from S3 detected, but disabled.\n"); |
| wake_from_s3 = 0; |
| #endif |
| } |
| |
| /* There are hard coded assumptions of 2 meaning s3 wake. Normalize |
| * the users of the 2 literal here based off wake_from_s3. */ |
| boot_mode = wake_from_s3 ? 2 : 0; |
| |
| /* Prepare USB controller early in S3 resume */ |
| if (wake_from_s3) |
| enable_usb_bar(); |
| |
| post_code(0x3a); |
| params->pei_data->boot_mode = boot_mode; |
| |
| timestamp_add_now(TS_BEFORE_INITRAM); |
| |
| report_platform_info(); |
| |
| if (params->copy_spd != NULL) |
| params->copy_spd(params->pei_data); |
| |
| sdram_initialize(params->pei_data); |
| |
| timestamp_add_now(TS_AFTER_INITRAM); |
| |
| post_code(0x3b); |
| |
| intel_early_me_status(); |
| |
| quick_ram_check(); |
| post_code(0x3e); |
| |
| if (!wake_from_s3) { |
| cbmem_initialize_empty(); |
| /* Save data returned from MRC on non-S3 resumes. */ |
| save_mrc_data(params->pei_data); |
| } else if (cbmem_initialize()) { |
| #if CONFIG_HAVE_ACPI_RESUME |
| /* Failed S3 resume, reset to come up cleanly */ |
| reset_system(); |
| #endif |
| } |
| |
| handoff = romstage_handoff_find_or_add(); |
| if (handoff != NULL) |
| handoff->s3_resume = wake_from_s3; |
| else |
| printk(BIOS_DEBUG, "Romstage handoff structure not added!\n"); |
| |
| post_code(0x3f); |
| #if CONFIG_CHROMEOS |
| init_chromeos(boot_mode); |
| #endif |
| timestamp_add_now(TS_END_ROMSTAGE); |
| } |
| |
| static inline void prepare_for_resume(struct romstage_handoff *handoff) |
| { |
| /* Only need to save memory when ramstage isn't relocatable. */ |
| #if !CONFIG_RELOCATABLE_RAMSTAGE |
| #if CONFIG_HAVE_ACPI_RESUME |
| /* Back up the OS-controlled memory where ramstage will be loaded. */ |
| if (handoff != NULL && handoff->s3_resume) { |
| void *src = (void *)CONFIG_RAMBASE; |
| void *dest = cbmem_find(CBMEM_ID_RESUME); |
| if (dest != NULL) |
| memcpy(dest, src, HIGH_MEMORY_SAVE); |
| } |
| #endif |
| #endif |
| } |
| |
| void romstage_after_car(void) |
| { |
| struct romstage_handoff *handoff; |
| |
| handoff = romstage_handoff_find_or_add(); |
| |
| prepare_for_resume(handoff); |
| |
| /* Load the ramstage. */ |
| copy_and_run(); |
| } |
| |
| |
| #if CONFIG_RELOCATABLE_RAMSTAGE |
| #include <ramstage_cache.h> |
| |
| struct ramstage_cache *ramstage_cache_location(long *size) |
| { |
| /* The ramstage cache lives in the TSEG region at RESERVED_SMM_OFFSET. |
| * The top of ram is defined to be the TSEG base address. */ |
| *size = RESERVED_SMM_SIZE; |
| return (void *)((uint32_t)cbmem_top() + RESERVED_SMM_OFFSET); |
| } |
| |
| void ramstage_cache_invalid(struct ramstage_cache *cache) |
| { |
| #if CONFIG_RESET_ON_INVALID_RAMSTAGE_CACHE |
| reset_system(); |
| #endif |
| } |
| #endif |