projects / u-boot.git / blame
| Commit | Line | Data |
|---|---|---|
| 83d290c5 | 1 | // SPDX-License-Identifier: GPL-2.0+ |
| cb3b2e62 SG |
2 | /* |
| 3 | * (C) Copyright 2014 Google, Inc | |
| cb3b2e62 SG |
4 | */ |
| 5 | ||
| 6 | #include <common.h> | |
| 7 | #include <asm/msr.h> | |
| 8 | #include <asm/mtrr.h> | |
| 9 | ||
| 10 | static const char *const mtrr_type_name[MTRR_TYPE_COUNT] = { | |
| 11 | "Uncacheable", | |
| 12 | "Combine", | |
| 13 | "2", | |
| 14 | "3", | |
| 15 | "Through", | |
| 16 | "Protect", | |
| 17 | "Back", | |
| 18 | }; | |
| 19 | ||
| 20 | static int do_mtrr_list(void) | |
| 21 | { | |
| 22 | int i; | |
| 23 | ||
| 24 | printf("Reg Valid Write-type %-16s %-16s %-16s\n", "Base ||", | |
| 25 | "Mask ||", "Size ||"); | |
| 26 | for (i = 0; i < MTRR_COUNT; i++) { | |
| 27 | const char *type = "Invalid"; | |
| 28 | uint64_t base, mask, size; | |
| 29 | bool valid; | |
| 30 | ||
| 31 | base = native_read_msr(MTRR_PHYS_BASE_MSR(i)); | |
| 32 | mask = native_read_msr(MTRR_PHYS_MASK_MSR(i)); | |
| 33 | size = ~mask & ((1ULL << CONFIG_CPU_ADDR_BITS) - 1); | |
| 34 | size |= (1 << 12) - 1; | |
| 35 | size += 1; | |
| 36 | valid = mask & MTRR_PHYS_MASK_VALID; | |
| 37 | type = mtrr_type_name[base & MTRR_BASE_TYPE_MASK]; | |
| 38 | printf("%d %-5s %-12s %016llx %016llx %016llx\n", i, | |
| df07d919 BM |
39 | valid ? "Y" : "N", type, base & ~MTRR_BASE_TYPE_MASK, |
| 40 | mask & ~MTRR_PHYS_MASK_VALID, size); | |
| cb3b2e62 SG |
41 | } |
| 42 | ||
| 43 | return 0; | |
| 44 | } | |
| 45 | ||
| 46 | static int do_mtrr_set(uint reg, int argc, char * const argv[]) | |
| 47 | { | |
| 48 | const char *typename = argv[0]; | |
| 49 | struct mtrr_state state; | |
| 50 | uint32_t start, size; | |
| 51 | uint64_t base, mask; | |
| 52 | int i, type = -1; | |
| 53 | bool valid; | |
| 54 | ||
| 55 | if (argc < 3) | |
| 56 | return CMD_RET_USAGE; | |
| 57 | for (i = 0; i < MTRR_TYPE_COUNT; i++) { | |
| 58 | if (*typename == *mtrr_type_name[i]) | |
| 59 | type = i; | |
| 60 | } | |
| 61 | if (type == -1) { | |
| 62 | printf("Invalid type name %s\n", typename); | |
| 63 | return CMD_RET_USAGE; | |
| 64 | } | |
| 65 | start = simple_strtoul(argv[1], NULL, 16); | |
| 66 | size = simple_strtoul(argv[2], NULL, 16); | |
| 67 | ||
| 68 | base = start | type; | |
| 69 | valid = native_read_msr(MTRR_PHYS_MASK_MSR(reg)) & MTRR_PHYS_MASK_VALID; | |
| 70 | mask = ~((uint64_t)size - 1); | |
| 71 | mask &= (1ULL << CONFIG_CPU_ADDR_BITS) - 1; | |
| 72 | if (valid) | |
| 73 | mask |= MTRR_PHYS_MASK_VALID; | |
| 74 | ||
| 75 | printf("base=%llx, mask=%llx\n", base, mask); | |
| 76 | mtrr_open(&state); | |
| 77 | wrmsrl(MTRR_PHYS_BASE_MSR(reg), base); | |
| 78 | wrmsrl(MTRR_PHYS_MASK_MSR(reg), mask); | |
| 79 | mtrr_close(&state); | |
| 80 | ||
| 81 | return 0; | |
| 82 | } | |
| 83 | ||
| 84 | static int mtrr_set_valid(int reg, bool valid) | |
| 85 | { | |
| 86 | struct mtrr_state state; | |
| 87 | uint64_t mask; | |
| 88 | ||
| 89 | mtrr_open(&state); | |
| 90 | mask = native_read_msr(MTRR_PHYS_MASK_MSR(reg)); | |
| 91 | if (valid) | |
| 92 | mask |= MTRR_PHYS_MASK_VALID; | |
| 93 | else | |
| 94 | mask &= ~MTRR_PHYS_MASK_VALID; | |
| 95 | wrmsrl(MTRR_PHYS_MASK_MSR(reg), mask); | |
| 96 | mtrr_close(&state); | |
| 97 | ||
| 98 | return 0; | |
| 99 | } | |
| 100 | ||
| 101 | static int do_mtrr(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) | |
| 102 | { | |
| 103 | const char *cmd; | |
| 104 | uint reg; | |
| 105 | ||
| 106 | cmd = argv[1]; | |
| 107 | if (argc < 2 || *cmd == 'l') | |
| 108 | return do_mtrr_list(); | |
| 109 | argc -= 2; | |
| 110 | argv += 2; | |
| 111 | if (argc <= 0) | |
| 112 | return CMD_RET_USAGE; | |
| 113 | reg = simple_strtoul(argv[0], NULL, 16); | |
| 114 | if (reg >= MTRR_COUNT) { | |
| 115 | printf("Invalid register number\n"); | |
| 116 | return CMD_RET_USAGE; | |
| 117 | } | |
| 118 | if (*cmd == 'e') | |
| 119 | return mtrr_set_valid(reg, true); | |
| 120 | else if (*cmd == 'd') | |
| 121 | return mtrr_set_valid(reg, false); | |
| 122 | else if (*cmd == 's') | |
| 123 | return do_mtrr_set(reg, argc - 1, argv + 1); | |
| 124 | else | |
| 125 | return CMD_RET_USAGE; | |
| 126 | ||
| 127 | return 0; | |
| 128 | } | |
| 129 | ||
| 130 | U_BOOT_CMD( | |
| 131 | mtrr, 6, 1, do_mtrr, | |
| 132 | "Use x86 memory type range registers (32-bit only)", | |
| 133 | "[list] - list current registers\n" | |
| 134 | "set <reg> <type> <start> <size> - set a register\n" | |
| 135 | "\t<type> is Uncacheable, Combine, Through, Protect, Back\n" | |
| 136 | "disable <reg> - disable a register\n" | |
| 137 | "ensable <reg> - enable a register" | |
| 138 | ); |