Lee Leahy | fba78bf | 2016-03-03 16:48:22 -0800 | [diff] [blame] | 1 | /* |
| 2 | * This file is part of the coreboot project. |
| 3 | * |
| 4 | * Copyright (C) 2013 Google Inc. |
| 5 | * Copyright (C) 2015-2016 Intel Corp. |
| 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, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | */ |
| 16 | |
| 17 | #include <console/console.h> |
| 18 | #include <cpu/x86/msr.h> |
| 19 | #include <cpu/x86/mtrr.h> |
| 20 | #include <soc/intel/common/util.h> |
| 21 | #include <soc/pci_devs.h> |
Lee Leahy | 01728bb | 2016-07-20 08:58:58 -0700 | [diff] [blame] | 22 | #include <soc/reg_access.h> |
Lee Leahy | fba78bf | 2016-03-03 16:48:22 -0800 | [diff] [blame] | 23 | |
Lee Leahy | fba78bf | 2016-03-03 16:48:22 -0800 | [diff] [blame] | 24 | asmlinkage void *soc_set_mtrrs(void *top_of_stack) |
| 25 | { |
| 26 | union { |
| 27 | uint32_t u32[2]; |
| 28 | uint64_t u64; |
| 29 | msr_t msr; |
| 30 | } data; |
| 31 | uint32_t mtrr_count; |
| 32 | uint32_t *mtrr_data; |
| 33 | uint32_t mtrr_reg; |
| 34 | |
| 35 | /* |
| 36 | * The stack contents are initialized in src/soc/intel/common/stack.c |
| 37 | * to be the following: |
| 38 | * |
| 39 | * * |
| 40 | * * |
| 41 | * * |
| 42 | * +36: MTRR mask 1 63:32 |
| 43 | * +32: MTRR mask 1 31:0 |
| 44 | * +28: MTRR base 1 63:32 |
| 45 | * +24: MTRR base 1 31:0 |
| 46 | * +20: MTRR mask 0 63:32 |
| 47 | * +16: MTRR mask 0 31:0 |
| 48 | * +12: MTRR base 0 63:32 |
| 49 | * +8: MTRR base 0 31:0 |
| 50 | * +4: Number of MTRRs to setup (described above) |
| 51 | * top_of_stack --> +0: Number of variable MTRRs to clear |
| 52 | * |
| 53 | * This routine: |
| 54 | * * Clears all of the variable MTRRs |
| 55 | * * Initializes the variable MTRRs with the data passed in |
| 56 | * * Returns the new top of stack after removing all of the |
| 57 | * data passed in. |
| 58 | */ |
| 59 | |
| 60 | /* Clear all of the variable MTRRs (base and mask). */ |
| 61 | mtrr_reg = MTRR_PHYS_BASE(0); |
| 62 | mtrr_data = top_of_stack; |
| 63 | mtrr_count = (*mtrr_data++) * 2; |
| 64 | data.u64 = 0; |
| 65 | while (mtrr_count-- > 0) |
Lee Leahy | ae738ac | 2016-07-24 08:03:37 -0700 | [diff] [blame] | 66 | soc_msr_write(mtrr_reg++, data.msr); |
Lee Leahy | fba78bf | 2016-03-03 16:48:22 -0800 | [diff] [blame] | 67 | |
| 68 | /* Setup the specified variable MTRRs */ |
| 69 | mtrr_reg = MTRR_PHYS_BASE(0); |
| 70 | mtrr_count = *mtrr_data++; |
| 71 | while (mtrr_count-- > 0) { |
| 72 | data.u32[0] = *mtrr_data++; |
| 73 | data.u32[1] = *mtrr_data++; |
Lee Leahy | ae738ac | 2016-07-24 08:03:37 -0700 | [diff] [blame] | 74 | soc_msr_write(mtrr_reg++, data.msr); /* Base */ |
Lee Leahy | fba78bf | 2016-03-03 16:48:22 -0800 | [diff] [blame] | 75 | data.u32[0] = *mtrr_data++; |
| 76 | data.u32[1] = *mtrr_data++; |
Lee Leahy | ae738ac | 2016-07-24 08:03:37 -0700 | [diff] [blame] | 77 | soc_msr_write(mtrr_reg++, data.msr); /* Mask */ |
Lee Leahy | fba78bf | 2016-03-03 16:48:22 -0800 | [diff] [blame] | 78 | } |
| 79 | |
| 80 | /* Remove setup_stack_and_mtrrs data and return the new top_of_stack */ |
| 81 | top_of_stack = mtrr_data; |
| 82 | return top_of_stack; |
| 83 | } |
| 84 | |
| 85 | asmlinkage void soc_enable_mtrrs(void) |
| 86 | { |
| 87 | union { |
| 88 | uint32_t u32[2]; |
| 89 | uint64_t u64; |
| 90 | msr_t msr; |
| 91 | } data; |
| 92 | |
| 93 | /* Enable MTRR. */ |
Lee Leahy | ae738ac | 2016-07-24 08:03:37 -0700 | [diff] [blame] | 94 | data.msr = soc_msr_read(MTRR_DEF_TYPE_MSR); |
Lee Leahy | fba78bf | 2016-03-03 16:48:22 -0800 | [diff] [blame] | 95 | data.u32[0] |= MTRR_DEF_TYPE_EN; |
Lee Leahy | ae738ac | 2016-07-24 08:03:37 -0700 | [diff] [blame] | 96 | soc_msr_write(MTRR_DEF_TYPE_MSR, data.msr); |
Lee Leahy | fba78bf | 2016-03-03 16:48:22 -0800 | [diff] [blame] | 97 | } |