summaryrefslogtreecommitdiff
path: root/src/cpu/x86/mtrr/debug.c
blob: 09ffa9f9775758b06a9fad51bcb389cc5b2f6f4b (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
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
/*
 * This file is part of the coreboot project.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <console/console.h>
#include <cpu/cpu.h>
#include <cpu/x86/mtrr.h>
#include <stdint.h>

static const char *display_mtrr_type(uint32_t type)
{
	switch (type) {
	default: return "reserved";
	case 0: return "UC";
	case 1: return "WC";
	case 4: return "WT";
	case 5: return "WP";
	case 6: return "WB";
	case 7: return "UC-";
	}
}

static void display_mtrr_fixed_types(uint64_t msr,
	uint32_t starting_address, uint32_t memory_size)
{
	uint32_t base_address;
	uint32_t index;
	uint32_t next_address;
	uint32_t next_type;
	uint32_t type;

	type = msr & MTRR_DEF_TYPE_MASK;
	base_address = starting_address;
	next_address = base_address;
	for (index = 0; index < 64; index += 8) {
		next_address = starting_address + (memory_size *
			((index >> 3) + 1));
		next_type = (msr >> index) & MTRR_DEF_TYPE_MASK;
		if (next_type != type) {
			printk(BIOS_DEBUG, "    0x%08x - 0x%08x: %s\n",
				base_address, next_address - 1,
				display_mtrr_type(type));
			base_address = next_address;
			type = next_type;
		}
	}
	if (base_address != next_address)
		printk(BIOS_DEBUG, "    0x%08x - 0x%08x: %s\n",
			base_address, next_address - 1,
			display_mtrr_type(type));
}

static void display_4k_mtrr(uint32_t msr_reg, uint32_t starting_address,
	const char *name)
{
	union {
		uint64_t u64;
		msr_t s;
	} msr;

	msr.s = rdmsr(msr_reg);
	printk(BIOS_DEBUG, "0x%016llx: %s\n", msr.u64, name);
	display_mtrr_fixed_types(msr.u64, starting_address, 0x1000);
}

static void display_16k_mtrr(uint32_t msr_reg, uint32_t starting_address,
	const char *name)
{
	union {
		uint64_t u64;
		msr_t s;
	} msr;

	msr.s = rdmsr(msr_reg);
	printk(BIOS_DEBUG, "0x%016llx: %s\n", msr.u64, name);
	display_mtrr_fixed_types(msr.u64, starting_address, 0x4000);
}

static void display_64k_mtrr(void)
{
	union {
		uint64_t u64;
		msr_t s;
	} msr;

	msr.s = rdmsr(MTRR_FIX_64K_00000);
	printk(BIOS_DEBUG, "0x%016llx: IA32_MTRR_FIX64K_00000\n", msr.u64);
	display_mtrr_fixed_types(msr.u64, 0, 0x10000);
}

static void display_mtrrcap(void)
{
	msr_t msr;

	msr = rdmsr(MTRR_CAP_MSR);
	printk(BIOS_DEBUG,
		"0x%08x%08x: IA32_MTRRCAP: %s%s%s%u variable MTRRs\n",
		msr.hi, msr.lo,
		(msr.lo & MTRR_CAP_SMRR) ? "SMRR, " : "",
		(msr.lo & MTRR_CAP_WC) ? "WC, " : "",
		(msr.lo & MTRR_CAP_FIX) ? "FIX, " : "",
		msr.lo & MTRR_CAP_VCNT);
}

static void display_mtrr_def_type(void)
{
	union {
		uint64_t u64;
		msr_t s;
	} msr;

	msr.s = rdmsr(MTRR_DEF_TYPE_MSR);
	printk(BIOS_DEBUG, "0x%016llx: IA32_MTRR_DEF_TYPE:%s%s %s\n",
		msr.u64,
		(msr.u64 & MTRR_DEF_TYPE_EN) ? " E," : "",
		(msr.u64 & MTRR_DEF_TYPE_FIX_EN) ? " FE," : "",
		display_mtrr_type((uint32_t)(msr.u64 &
			MTRR_DEF_TYPE_MASK)));
}

static void display_variable_mtrr(int index, uint64_t address_mask)
{
	const uint32_t msr_reg = MTRR_PHYS_BASE(index);
	uint64_t base_address;
	uint64_t length;
	uint64_t mask;
	union {
		uint64_t u64;
		msr_t s;
	} msr_a;
	union {
		uint64_t u64;
		msr_t s;
	} msr_m;

	msr_a.s = rdmsr(msr_reg);
	msr_m.s = rdmsr(msr_reg + 1);
	if (msr_m.u64 & MTRR_PHYS_MASK_VALID) {
		base_address = (msr_a.u64 & 0xfffffffffffff000ULL)
			& address_mask;
		printk(BIOS_DEBUG,
			"0x%016llx: PHYBASE%d: Address = 0x%016llx, %s\n",
			msr_a.u64, index, base_address,
			display_mtrr_type(msr_a.u64 & MTRR_DEF_TYPE_MASK));
		mask = (msr_m.u64 & 0xfffffffffffff000ULL) & address_mask;
		length = (~mask & address_mask) + 1;
		printk(BIOS_DEBUG,
			"0x%016llx: PHYMASK%d: Length  = 0x%016llx, Valid\n",
			msr_m.u64, index, length);
	} else {
		printk(BIOS_DEBUG, "0x%016llx: PHYBASE%d\n", msr_a.u64, index);
		printk(BIOS_DEBUG, "0x%016llx: PHYMASK%d: Disabled\n",
			msr_m.u64, index);
	}
}

static void _display_mtrrs(void)
{
	uint32_t address_bits;
	uint64_t address_mask;
	int i;
	int variable_mtrrs;

	/* Display the fixed MTRRs */
	display_mtrrcap();
	display_mtrr_def_type();
	display_64k_mtrr();
	display_16k_mtrr(MTRR_FIX_16K_80000, 0x80000, "IA32_MTRR_FIX16K_80000");
	display_16k_mtrr(MTRR_FIX_16K_A0000, 0xa0000, "IA32_MTRR_FIX16K_A0000");
	display_4k_mtrr(MTRR_FIX_4K_C0000, 0xc0000, "IA32_MTRR_FIX4K_C0000");
	display_4k_mtrr(MTRR_FIX_4K_C8000, 0xc8000, "IA32_MTRR_FIX4K_C8000");
	display_4k_mtrr(MTRR_FIX_4K_D0000, 0xd0000, "IA32_MTRR_FIX4K_D0000");
	display_4k_mtrr(MTRR_FIX_4K_D8000, 0xd8000, "IA32_MTRR_FIX4K_D8000");
	display_4k_mtrr(MTRR_FIX_4K_E0000, 0xe0000, "IA32_MTRR_FIX4K_E0000");
	display_4k_mtrr(MTRR_FIX_4K_E8000, 0xe8000, "IA32_MTRR_FIX4K_E8000");
	display_4k_mtrr(MTRR_FIX_4K_F0000, 0xf0000, "IA32_MTRR_FIX4K_F0000");
	display_4k_mtrr(MTRR_FIX_4K_F8000, 0xf8000, "IA32_MTRR_FIX4K_F8000");
	address_bits = cpu_phys_address_size();
	address_mask = (1ULL << address_bits) - 1;

	/* Display the variable MTRRs */
	variable_mtrrs = get_var_mtrr_count();
	for (i = 0; i < variable_mtrrs; i++)
		display_variable_mtrr(i, address_mask);
}

asmlinkage void display_mtrrs(void)
{
	if (CONFIG(DISPLAY_MTRRS))
		_display_mtrrs();
}