mtrr.c
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/*
* (C) Copyright 2014 Google, Inc
*
* SPDX-License-Identifier: GPL-2.0+
*/
#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);
wrmsrl(MTRR_PHYS_BASE_MSR(reg), base);
wrmsrl(MTRR_PHYS_MASK_MSR(reg), mask);
mtrr_close(&state);
return 0;
}
static int mtrr_set_valid(int reg, bool valid)
{
struct mtrr_state state;
uint64_t mask;
mtrr_open(&state);
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);
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"
);