Lee Leahy | 77ff0b1 | 2015-05-05 15:07:29 -0700 | [diff] [blame] | 1 | /* |
| 2 | * This file is part of the coreboot project. |
| 3 | * |
| 4 | * Copyright (C) 2013 Google, Inc. |
Lee Leahy | e0918bb | 2016-01-29 14:28:43 -0800 | [diff] [blame] | 5 | * Copyright (C) 2015-2016 Intel Corp. |
Lee Leahy | 77ff0b1 | 2015-05-05 15:07:29 -0700 | [diff] [blame] | 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; version 2 of the License. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
Lee Leahy | e0918bb | 2016-01-29 14:28:43 -0800 | [diff] [blame] | 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
Lee Leahy | 77ff0b1 | 2015-05-05 15:07:29 -0700 | [diff] [blame] | 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
Lee Leahy | 77ff0b1 | 2015-05-05 15:07:29 -0700 | [diff] [blame] | 15 | */ |
| 16 | |
Lee Leahy | 77ff0b1 | 2015-05-05 15:07:29 -0700 | [diff] [blame] | 17 | #include <cbmem.h> |
Kyösti Mälkki | b2a5f0b | 2019-08-04 19:54:32 +0300 | [diff] [blame] | 18 | #include <cpu/x86/smm.h> |
Lee Leahy | 77ff0b1 | 2015-05-05 15:07:29 -0700 | [diff] [blame] | 19 | #include <soc/iosf.h> |
| 20 | #include <soc/smm.h> |
| 21 | |
Lee Leahy | 3247172 | 2015-04-20 15:20:28 -0700 | [diff] [blame] | 22 | static size_t smm_region_size(void) |
Lee Leahy | 77ff0b1 | 2015-05-05 15:07:29 -0700 | [diff] [blame] | 23 | { |
Lee Leahy | 3247172 | 2015-04-20 15:20:28 -0700 | [diff] [blame] | 24 | u32 smm_size; |
| 25 | smm_size = iosf_bunit_read(BUNIT_SMRRH) & 0xFFFF; |
| 26 | smm_size -= iosf_bunit_read(BUNIT_SMRRL) & 0xFFFF; |
| 27 | smm_size = (smm_size + 1) << 20; |
| 28 | return smm_size; |
| 29 | } |
| 30 | |
| 31 | void smm_region(void **start, size_t *size) |
| 32 | { |
| 33 | *start = (void *)((iosf_bunit_read(BUNIT_SMRRL) & 0xFFFF) << 20); |
| 34 | *size = smm_region_size(); |
| 35 | } |
| 36 | |
Aaron Durbin | c43d417 | 2015-08-05 14:51:48 -0500 | [diff] [blame] | 37 | /* |
| 38 | * Subregions within SMM |
| 39 | * +-------------------------+ BUNIT_SMRRH |
| 40 | * | External Stage Cache | SMM_RESERVED_SIZE |
| 41 | * +-------------------------+ |
| 42 | * | code and data | |
| 43 | * | (TSEG) | |
| 44 | * +-------------------------+ BUNIT_SMRRL |
| 45 | */ |
| 46 | int smm_subregion(int sub, void **start, size_t *size) |
| 47 | { |
| 48 | uintptr_t sub_base; |
| 49 | void *sub_ptr; |
| 50 | size_t sub_size; |
| 51 | const size_t cache_size = CONFIG_SMM_RESERVED_SIZE; |
| 52 | |
| 53 | smm_region(&sub_ptr, &sub_size); |
| 54 | sub_base = (uintptr_t)sub_ptr; |
| 55 | |
| 56 | switch (sub) { |
| 57 | case SMM_SUBREGION_HANDLER: |
| 58 | /* Handler starts at the base of TSEG. */ |
| 59 | sub_size -= cache_size; |
| 60 | break; |
| 61 | case SMM_SUBREGION_CACHE: |
| 62 | /* External cache is in the middle of TSEG. */ |
| 63 | sub_base += sub_size - cache_size; |
| 64 | sub_size = cache_size; |
| 65 | break; |
| 66 | default: |
| 67 | return -1; |
| 68 | } |
| 69 | |
| 70 | *start = (void *)sub_base; |
| 71 | *size = sub_size; |
| 72 | |
| 73 | return 0; |
| 74 | } |
| 75 | |
Lee Leahy | 77ff0b1 | 2015-05-05 15:07:29 -0700 | [diff] [blame] | 76 | void *cbmem_top(void) |
| 77 | { |
Lee Leahy | 3247172 | 2015-04-20 15:20:28 -0700 | [diff] [blame] | 78 | char *smm_base; |
| 79 | size_t smm_size; |
| 80 | |
| 81 | /* |
| 82 | * +-------------------------+ Top of RAM (aligned) |
| 83 | * | System Management Mode | |
| 84 | * | code and data | Length: CONFIG_TSEG_SIZE |
| 85 | * | (TSEG) | |
| 86 | * +-------------------------+ SMM base (aligned) |
| 87 | * | | |
| 88 | * | Chipset Reserved Memory | Length: Multiple of CONFIG_TSEG_SIZE |
| 89 | * | | |
| 90 | * +-------------------------+ top_of_ram (aligned) |
| 91 | * | | |
| 92 | * | CBMEM Root | |
| 93 | * | | |
| 94 | * +-------------------------+ |
| 95 | * | | |
| 96 | * | FSP Reserved Memory | |
| 97 | * | | |
| 98 | * +-------------------------+ |
| 99 | * | | |
| 100 | * | Various CBMEM Entries | |
| 101 | * | | |
| 102 | * +-------------------------+ top_of_stack (8 byte aligned) |
| 103 | * | | |
| 104 | * | stack (CBMEM Entry) | |
| 105 | * | | |
| 106 | * +-------------------------+ |
| 107 | */ |
| 108 | |
| 109 | smm_region((void **)&smm_base, &smm_size); |
Aaron Durbin | bbbfbf2 | 2015-07-13 16:55:28 -0500 | [diff] [blame] | 110 | return (void *)smm_base; |
Lee Leahy | 77ff0b1 | 2015-05-05 15:07:29 -0700 | [diff] [blame] | 111 | } |