| /* |
| * This file is part of the coreboot project. |
| * |
| * Copyright (C) 2013 Google Inc. |
| * Copyright (C) 2015 Intel Corp. |
| * |
| * 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. |
| */ |
| |
| #include <cbmem.h> |
| #include <console/console.h> |
| #include <cpu/x86/mtrr.h> |
| #include "memmap.h" |
| #include "romstage.h" |
| #include <soc/intel/common/util.h> |
| #include "stack.h" |
| #include <stdlib.h> |
| |
| const unsigned long romstage_ram_stack_size = CONFIG_ROMSTAGE_RAM_STACK_SIZE; |
| |
| /* |
| * Romstage needs quite a bit of stack for decompressing images since the lzma |
| * lib keeps its state on the stack during romstage. |
| */ |
| static unsigned long choose_top_of_stack(void) |
| { |
| unsigned long stack_top; |
| |
| /* 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; |
| return stack_top; |
| } |
| |
| /* |
| * setup_stack_and_mtrrs() determines the stack to use after |
| * cache-as-ram is torn down as well as the MTRR settings to use. |
| */ |
| void *setup_stack_and_mtrrs(void) |
| { |
| size_t alignment; |
| uint32_t aligned_ram; |
| uint32_t mtrr_mask_upper; |
| uint32_t max_mtrrs; |
| uint32_t num_mtrrs; |
| uint32_t *slot; |
| unsigned long top_of_stack; |
| |
| /* Display the MTTRs */ |
| soc_display_mtrrs(); |
| |
| /* Top of stack needs to be aligned to a 8-byte boundary. */ |
| top_of_stack = choose_top_of_stack(); |
| slot = (void *)top_of_stack; |
| num_mtrrs = 0; |
| max_mtrrs = soc_get_variable_mtrr_count(NULL); |
| |
| /* |
| * 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; |
| alignment = mmap_region_granluarity(); |
| aligned_ram = ALIGN_DOWN(top_of_stack - romstage_ram_stack_size, |
| alignment); |
| |
| /* |
| * 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: |
| * |
| * +36: MTRR mask 1 63:32 |
| * +32: MTRR mask 1 31:0 |
| * +28: MTRR base 1 63:32 |
| * +24: MTRR base 1 31:0 |
| * +20: MTRR mask 0 63:32 |
| * +16: MTRR mask 0 31:0 |
| * +12: MTRR base 0 63:32 |
| * +8: MTRR base 0 31:0 |
| * +4: Number of MTRRs to setup (described above) |
| * +0: Number of variable MTRRs to clear |
| */ |
| |
| /* Cache RAM as WB from 0 -> CONFIG_RAMTOP. */ |
| slot = stack_push32(slot, mtrr_mask_upper); /* upper mask */ |
| slot = stack_push32(slot, ~(CONFIG_RAMTOP - 1) | MTRRphysMaskValid); |
| slot = stack_push32(slot, 0); /* upper base */ |
| slot = stack_push32(slot, 0 | MTRR_TYPE_WRBACK); |
| num_mtrrs++; |
| |
| /* |
| * +-------------------------+ Top of RAM (aligned) |
| * | System Management Mode | |
| * | code and data | Length: CONFIG_TSEG_SIZE |
| * | (TSEG) | |
| * +-------------------------+ SMM base (aligned) |
| * | | |
| * | Chipset Reserved Memory | Length: Multiple of CONFIG_TSEG_SIZE |
| * | | |
| * +-------------------------+ top_of_ram (aligned) |
| * | | |
| * | CBMEM Root | |
| * | | |
| * +-------------------------+ |
| * | | |
| * | FSP Reserved Memory | |
| * | | |
| * +-------------------------+ |
| * | | |
| * | Various CBMEM Entries | |
| * | | |
| * +-------------------------+ top_of_stack (8 byte aligned) |
| * | | |
| * | stack (CBMEM Entry) | |
| * | | |
| * +-------------------------+ |
| */ |
| |
| /* |
| * Cache the stack and the other CBMEM entries as well as part or all |
| * of the FSP reserved memory region. |
| */ |
| slot = stack_push32(slot, mtrr_mask_upper); /* upper mask */ |
| slot = stack_push32(slot, ~(alignment - 1) | MTRRphysMaskValid); |
| slot = stack_push32(slot, 0); /* upper base */ |
| slot = stack_push32(slot, aligned_ram | MTRR_TYPE_WRBACK); |
| num_mtrrs++; |
| |
| #if IS_ENABLED(CONFIG_HAVE_SMI_HANDLER) |
| void *smm_base; |
| size_t smm_size; |
| uint32_t tseg_base; |
| |
| /* |
| * 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. |
| */ |
| smm_region(&smm_base, &smm_size); |
| tseg_base = (uint32_t)smm_base; |
| slot = stack_push32(slot, mtrr_mask_upper); /* upper mask */ |
| slot = stack_push32(slot, ~(alignment - 1) | MTRRphysMaskValid); |
| slot = stack_push32(slot, 0); /* upper base */ |
| slot = stack_push32(slot, tseg_base | MTRR_TYPE_WRBACK); |
| num_mtrrs++; |
| #endif |
| |
| /* Cache the ROM as WP just below 4GiB. */ |
| slot = stack_push32(slot, mtrr_mask_upper); /* upper mask */ |
| slot = stack_push32(slot, ~(CONFIG_ROM_SIZE - 1) | MTRRphysMaskValid); |
| slot = stack_push32(slot, 0); /* upper base */ |
| slot = stack_push32(slot, ~(CONFIG_ROM_SIZE - 1) | MTRR_TYPE_WRPROT); |
| num_mtrrs++; |
| |
| /* Validate the MTRR usage */ |
| if (num_mtrrs > max_mtrrs) { |
| printk(BIOS_ERR, "MTRRs: max = %d, used = %d, available=%d", |
| max_mtrrs, num_mtrrs, max_mtrrs - num_mtrrs); |
| die("ERROR - MTRR use count incorrect!\n"); |
| } |
| |
| /* |
| * Save the number of MTRRs to setup and clear. Return the stack |
| * location pointing to the number of MTRRs. |
| */ |
| slot = stack_push32(slot, num_mtrrs); |
| slot = stack_push32(slot, max_mtrrs); |
| return slot; |
| } |
| |