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