| Kyösti Mälkki | 4913d8a | 2019-08-05 12:49:09 +0300 | [diff] [blame^] | 1 | /* |
| 2 | * This file is part of the coreboot project. |
| 3 | * |
| 4 | * Copyright 2013 Google Inc. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; version 2 of the License. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | */ |
| 15 | |
| 16 | #include <assert.h> |
| 17 | #include <commonlib/helpers.h> |
| 18 | #include <console/console.h> |
| 19 | #include <cpu/x86/smm.h> |
| 20 | #include <stage_cache.h> |
| 21 | #include <types.h> |
| 22 | |
| 23 | void __weak smm_region(uintptr_t *start, size_t *size) |
| 24 | { |
| 25 | *start = 0; |
| 26 | *size = 0; |
| 27 | } |
| 28 | |
| 29 | /* |
| 30 | * Subregions within SMM |
| 31 | * +-------------------------+ |
| 32 | * | IED | IED_REGION_SIZE |
| 33 | * +-------------------------+ |
| 34 | * | External Stage Cache | SMM_RESERVED_SIZE |
| 35 | * +-------------------------+ |
| 36 | * | code and data | |
| 37 | * | (TSEG) | |
| 38 | * +-------------------------+ TSEG |
| 39 | */ |
| 40 | int smm_subregion(int sub, uintptr_t *start, size_t *size) |
| 41 | { |
| 42 | uintptr_t sub_base; |
| 43 | size_t sub_size; |
| 44 | const size_t ied_size = CONFIG_IED_REGION_SIZE; |
| 45 | const size_t cache_size = CONFIG_SMM_RESERVED_SIZE; |
| 46 | |
| 47 | smm_region(&sub_base, &sub_size); |
| 48 | |
| 49 | ASSERT(IS_ALIGNED(sub_base, sub_size)); |
| 50 | ASSERT(sub_size > (cache_size + ied_size)); |
| 51 | |
| 52 | switch (sub) { |
| 53 | case SMM_SUBREGION_HANDLER: |
| 54 | /* Handler starts at the base of TSEG. */ |
| 55 | sub_size -= ied_size; |
| 56 | sub_size -= cache_size; |
| 57 | break; |
| 58 | case SMM_SUBREGION_CACHE: |
| 59 | /* External cache is in the middle of TSEG. */ |
| 60 | sub_base += sub_size - (ied_size + cache_size); |
| 61 | sub_size = cache_size; |
| 62 | break; |
| 63 | case SMM_SUBREGION_CHIPSET: |
| 64 | /* IED is at the top. */ |
| 65 | sub_base += sub_size - ied_size; |
| 66 | sub_size = ied_size; |
| 67 | break; |
| 68 | default: |
| 69 | *start = 0; |
| 70 | *size = 0; |
| 71 | return -1; |
| 72 | } |
| 73 | |
| 74 | *start = sub_base; |
| 75 | *size = sub_size; |
| 76 | return 0; |
| 77 | } |
| 78 | |
| 79 | void __weak stage_cache_external_region(void **base, size_t *size) |
| 80 | { |
| 81 | if (smm_subregion(SMM_SUBREGION_CACHE, (uintptr_t *)base, size)) { |
| 82 | printk(BIOS_ERR, "ERROR: No cache SMM subregion.\n"); |
| 83 | *base = NULL; |
| 84 | *size = 0; |
| 85 | } |
| 86 | } |