summaryrefslogtreecommitdiff
path: root/cmd/x86/mtrr.c
blob: d8a7e56d5a48256a44cce370e11b8a1f0ddaf549 (plain)
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
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
// 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') {
		return do_mtrr_list(cpu_select);
	} 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"
);