1 // SPDX-License-Identifier: GPL-2.0+
3 * (C) Copyright 2014 Google, Inc
13 static const char *const mtrr_type_name[MTRR_TYPE_COUNT] = {
23 static void read_mtrrs(void *arg)
25 struct mtrr_info *info = arg;
30 static int do_mtrr_list(int cpu_select)
32 struct mtrr_info info;
36 printf("Reg Valid Write-type %-16s %-16s %-16s\n", "Base ||",
37 "Mask ||", "Size ||");
38 memset(&info, '\0', sizeof(info));
39 ret = mp_run_on_cpus(cpu_select, read_mtrrs, &info);
41 return log_msg_ret("run", ret);
42 for (i = 0; i < MTRR_COUNT; i++) {
43 const char *type = "Invalid";
44 uint64_t base, mask, size;
47 base = info.mtrr[i].base;
48 mask = info.mtrr[i].mask;
49 size = ~mask & ((1ULL << CONFIG_CPU_ADDR_BITS) - 1);
50 size |= (1 << 12) - 1;
52 valid = mask & MTRR_PHYS_MASK_VALID;
53 type = mtrr_type_name[base & MTRR_BASE_TYPE_MASK];
54 printf("%d %-5s %-12s %016llx %016llx %016llx\n", i,
55 valid ? "Y" : "N", type, base & ~MTRR_BASE_TYPE_MASK,
56 mask & ~MTRR_PHYS_MASK_VALID, size);
62 static int do_mtrr_set(int cpu_select, uint reg, int argc, char *const argv[])
64 const char *typename = argv[0];
73 for (i = 0; i < MTRR_TYPE_COUNT; i++) {
74 if (*typename == *mtrr_type_name[i])
78 printf("Invalid type name %s\n", typename);
81 start = simple_strtoul(argv[1], NULL, 16);
82 size = simple_strtoul(argv[2], NULL, 16);
85 valid = native_read_msr(MTRR_PHYS_MASK_MSR(reg)) & MTRR_PHYS_MASK_VALID;
86 mask = ~((uint64_t)size - 1);
87 mask &= (1ULL << CONFIG_CPU_ADDR_BITS) - 1;
89 mask |= MTRR_PHYS_MASK_VALID;
91 ret = mtrr_set(cpu_select, reg, base, mask);
93 return CMD_RET_FAILURE;
98 static int do_mtrr(struct cmd_tbl *cmdtp, int flag, int argc,
106 cpu_select = MP_SELECT_BSP;
109 cmd = argv[0] ? *argv[0] : 0;
110 if (argc < 1 || !cmd) {
115 return CMD_RET_USAGE;
116 reg = simple_strtoul(argv[1], NULL, 16);
117 if (reg >= MTRR_COUNT) {
118 printf("Invalid register number\n");
119 return CMD_RET_USAGE;
123 return do_mtrr_list(cpu_select);
127 ret = mtrr_set_valid(cpu_select, reg, true);
130 ret = mtrr_set_valid(cpu_select, reg, false);
133 ret = do_mtrr_set(cpu_select, reg, argc - 2, argv + 2);
136 return CMD_RET_USAGE;
139 printf("Operation failed (err=%d)\n", ret);
140 return CMD_RET_FAILURE;
149 "Use x86 memory type range registers (32-bit only)",
150 "[list] - list current registers\n"
151 "set <reg> <type> <start> <size> - set a register\n"
152 "\t<type> is Uncacheable, Combine, Through, Protect, Back\n"
153 "disable <reg> - disable a register\n"
154 "enable <reg> - enable a register"