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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2014 Google, Inc
*/
#include <common.h>
#include <command.h>
#include <log.h>
#include <asm/msr.h>
#include <asm/mp.h>
#include <asm/mtrr.h>
static const char *const mtrr_type_name[MTRR_TYPE_COUNT] = {
"Uncacheable",
"Combine",
"2",
"3",
"Through",
"Protect",
"Back",
};
static void read_mtrrs(void *arg)
{
struct mtrr_info *info = arg;
mtrr_read_all(info);
}
static int do_mtrr_list(int cpu_select)
{
struct mtrr_info info;
int ret;
int i;
printf("Reg Valid Write-type %-16s %-16s %-16s\n", "Base ||",
"Mask ||", "Size ||");
memset(&info, '\0', sizeof(info));
ret = mp_run_on_cpus(cpu_select, read_mtrrs, &info);
if (ret)
return log_msg_ret("run", ret);
for (i = 0; i < MTRR_COUNT; i++) {
const char *type = "Invalid";
uint64_t base, mask, size;
bool valid;
base = info.mtrr[i].base;
mask = info.mtrr[i].mask;
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(int cpu_select, uint reg, int argc, char *const argv[])
{
const char *typename = argv[0];
uint32_t start, size;
uint64_t base, mask;
int i, type = -1;
bool valid;
int ret;
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;
ret = mtrr_set(cpu_select, reg, base, mask);
if (ret)
return CMD_RET_FAILURE;
return 0;
}
static int do_mtrr(struct cmd_tbl *cmdtp, int flag, int argc,
char *const argv[])
{
int cmd;
int cpu_select;
uint reg;
int ret;
cpu_select = MP_SELECT_BSP;
if (argc >= 3 && !strcmp("-c", argv[1])) {
const char *cpustr;
cpustr = argv[2];
if (*cpustr == 'a')
cpu_select = MP_SELECT_ALL;
else
cpu_select = simple_strtol(cpustr, NULL, 16);
argc -= 2;
argv += 2;
}
argc--;
argv++;
cmd = argv[0] ? *argv[0] : 0;
if (argc < 1 || !cmd) {
cmd = 'l';
reg = 0;
} else {
if (argc < 2)
return CMD_RET_USAGE;
reg = simple_strtoul(argv[1], NULL, 16);
if (reg >= MTRR_COUNT) {
printf("Invalid register number\n");
return CMD_RET_USAGE;
}
}
if (cmd == 'l') {
bool first;
int i;
i = mp_first_cpu(cpu_select);
if (i < 0) {
printf("Invalid CPU (err=%d)\n", i);
return CMD_RET_FAILURE;
}
first = true;
for (; i >= 0; i = mp_next_cpu(cpu_select, i)) {
if (!first)
printf("\n");
printf("CPU %d:\n", i);
ret = do_mtrr_list(i);
if (ret) {
printf("Failed to read CPU %d (err=%d)\n", i,
ret);
return CMD_RET_FAILURE;
}
first = false;
}
} else {
switch (cmd) {
case 'e':
ret = mtrr_set_valid(cpu_select, reg, true);
break;
case 'd':
ret = mtrr_set_valid(cpu_select, reg, false);
break;
case 's':
ret = do_mtrr_set(cpu_select, reg, argc - 2, argv + 2);
break;
default:
return CMD_RET_USAGE;
}
if (ret) {
printf("Operation failed (err=%d)\n", ret);
return CMD_RET_FAILURE;
}
}
return 0;
}
U_BOOT_CMD(
mtrr, 8, 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"
"enable <reg> - enable a register\n"
"\n"
"Precede command with '-c <n>|all' to access a particular hex CPU, e.g.\n"
" mtrr -c all list; mtrr -c 2e list"
);
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