summaryrefslogtreecommitdiff
path: root/cmd/efi.c
blob: 6c1eb88424be054c56d26b90da72f3e637acc2c0 (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
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
// SPDX-License-Identifier: GPL-2.0+
/*
 * (C) Copyright 2015 Google, Inc
 * Written by Simon Glass <sjg@chromium.org>
 */

#include <common.h>
#include <command.h>
#include <efi.h>
#include <errno.h>
#include <malloc.h>

static const char *const type_name[] = {
	"reserved",
	"loader_code",
	"loader_data",
	"bs_code",
	"bs_data",
	"rt_code",
	"rt_data",
	"conv",
	"unusable",
	"acpi_reclaim",
	"acpi_nvs",
	"io",
	"io_port",
	"pal_code",
};

static struct attr_info {
	int shift;
	const char *name;
} mem_attr[] = {
	{ EFI_MEMORY_UC_SHIFT, "uncached" },
	{ EFI_MEMORY_WC_SHIFT, "write-coalescing" },
	{ EFI_MEMORY_WT_SHIFT, "write-through" },
	{ EFI_MEMORY_WB_SHIFT, "write-back" },
	{ EFI_MEMORY_UCE_SHIFT, "uncached & exported" },
	{ EFI_MEMORY_WP_SHIFT, "write-protect" },
	{ EFI_MEMORY_RP_SHIFT, "read-protect" },
	{ EFI_MEMORY_XP_SHIFT, "execute-protect" },
	{ EFI_MEMORY_RUNTIME_SHIFT, "needs runtime mapping" }
};

/* Maximum different attribute values we can track */
#define ATTR_SEEN_MAX	30

static inline bool is_boot_services(int type)
{
	return type == EFI_LOADER_CODE || type == EFI_LOADER_DATA ||
		type == EFI_BOOT_SERVICES_CODE ||
		type == EFI_BOOT_SERVICES_DATA;
}

static int h_cmp_entry(const void *v1, const void *v2)
{
	const struct efi_mem_desc *desc1 = v1;
	const struct efi_mem_desc *desc2 = v2;
	int64_t diff = desc1->physical_start - desc2->physical_start;

	/*
	 * Manually calculate the difference to avoid sign loss in the 64-bit
	 * to 32-bit conversion
	 */
	return diff < 0 ? -1 : diff > 0 ? 1 : 0;
}

void *efi_build_mem_table(struct efi_entry_memmap *map, int size, bool skip_bs)
{
	struct efi_mem_desc *desc, *end, *base, *dest, *prev;
	int count;
	u64 addr;

	base = malloc(size + sizeof(*desc));
	if (!base) {
		debug("%s: Cannot allocate %#x bytes\n", __func__, size);
		return NULL;
	}
	end = (struct efi_mem_desc *)((ulong)map + size);
	count = ((ulong)end - (ulong)map->desc) / map->desc_size;
	memcpy(base, map->desc, (ulong)end - (ulong)map->desc);
	qsort(base, count, map->desc_size, h_cmp_entry);
	prev = NULL;
	addr = 0;
	dest = base;
	end = (struct efi_mem_desc *)((ulong)base + count * map->desc_size);
	for (desc = base; desc < end; desc = efi_get_next_mem_desc(map, desc)) {
		bool merge = true;
		int type = desc->type;

		if (skip_bs && is_boot_services(desc->type))
			type = EFI_CONVENTIONAL_MEMORY;

		memcpy(dest, desc, map->desc_size);
		dest->type = type;
		if (!skip_bs || !prev)
			merge = false;
		else if (desc->physical_start != addr)
			merge = false;
		else if (type != EFI_CONVENTIONAL_MEMORY)
			merge = false;
		else if (prev->type != EFI_CONVENTIONAL_MEMORY)
			merge = false;

		if (merge) {
			prev->num_pages += desc->num_pages;
		} else {
			prev = dest;
			dest = efi_get_next_mem_desc(map, dest);
		}
		addr = desc->physical_start + (desc->num_pages <<
				EFI_PAGE_SHIFT);
	}

	/* Mark the end */
	dest->type = EFI_TABLE_END;

	return base;
}

static void efi_print_mem_table(struct efi_entry_memmap *map,
				struct efi_mem_desc *desc, bool skip_bs)
{
	u64 attr_seen[ATTR_SEEN_MAX];
	int attr_seen_count;
	int upto, i;
	u64 addr;

	printf(" #  %-14s  %10s  %10s  %10s  %s\n", "Type", "Physical",
	       "Virtual", "Size", "Attributes");

	/* Keep track of all the different attributes we have seen */
	attr_seen_count = 0;
	addr = 0;
	for (upto = 0; desc->type != EFI_TABLE_END;
	     upto++, desc = efi_get_next_mem_desc(map, desc)) {
		const char *name;
		u64 size;

		if (skip_bs && is_boot_services(desc->type))
			continue;
		if (desc->physical_start != addr) {
			printf("    %-14s  %010llx  %10s  %010llx\n", "<gap>",
			       addr, "", desc->physical_start - addr);
		}
		size = desc->num_pages << EFI_PAGE_SHIFT;

		name = desc->type < ARRAY_SIZE(type_name) ?
				type_name[desc->type] : "<invalid>";
		printf("%2d  %x:%-12s  %010llx  %010llx  %010llx  ", upto,
		       desc->type, name, desc->physical_start,
		       desc->virtual_start, size);
		if (desc->attribute & EFI_MEMORY_RUNTIME)
			putc('r');
		printf("%llx", desc->attribute & ~EFI_MEMORY_RUNTIME);
		putc('\n');

		for (i = 0; i < attr_seen_count; i++) {
			if (attr_seen[i] == desc->attribute)
				break;
		}
		if (i == attr_seen_count && i < ATTR_SEEN_MAX)
			attr_seen[attr_seen_count++] = desc->attribute;
		addr = desc->physical_start + size;
	}

	printf("\nAttributes key:\n");
	for (i = 0; i < attr_seen_count; i++) {
		u64 attr = attr_seen[i];
		bool first;
		int j;

		printf("%c%llx: ", attr & EFI_MEMORY_RUNTIME ? 'r' : ' ',
		       attr & ~EFI_MEMORY_RUNTIME);
		for (j = 0, first = true; j < ARRAY_SIZE(mem_attr); j++) {
			if (attr & (1ULL << mem_attr[j].shift)) {
				if (first)
					first = false;
				else
					printf(", ");
				printf("%s", mem_attr[j].name);
			}
		}
		putc('\n');
	}
	if (skip_bs)
		printf("*Some areas are merged (use 'all' to see)\n");
}

static int do_efi_mem(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
	struct efi_mem_desc *desc;
	struct efi_entry_memmap *map;
	int size, ret;
	bool skip_bs;

	skip_bs = !argc || *argv[0] != 'a';
	ret = efi_info_get(EFIET_MEMORY_MAP, (void **)&map, &size);
	switch (ret) {
	case -ENOENT:
		printf("No EFI table available\n");
		goto done;
	case -EPROTONOSUPPORT:
		printf("Incorrect EFI table version\n");
		goto done;
	}
	printf("EFI table at %lx, memory map %p, size %x, version %x, descr. size %#x\n",
	       gd->arch.table, map, size, map->version, map->desc_size);
	if (map->version != EFI_MEM_DESC_VERSION) {
		printf("Incorrect memory map version\n");
		ret = -EPROTONOSUPPORT;
		goto done;
	}

	desc = efi_build_mem_table(map, size, skip_bs);
	if (!desc) {
		ret = -ENOMEM;
		goto done;
	}

	efi_print_mem_table(map, desc, skip_bs);
	free(desc);
done:
	if (ret)
		printf("Error: %d\n", ret);

	return ret ? CMD_RET_FAILURE : 0;
}

static cmd_tbl_t efi_commands[] = {
	U_BOOT_CMD_MKENT(mem, 1, 1, do_efi_mem, "", ""),
};

static int do_efi(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
	cmd_tbl_t *efi_cmd;
	int ret;

	if (argc < 2)
		return CMD_RET_USAGE;
	efi_cmd = find_cmd_tbl(argv[1], efi_commands, ARRAY_SIZE(efi_commands));
	argc -= 2;
	argv += 2;
	if (!efi_cmd || argc > efi_cmd->maxargs)
		return CMD_RET_USAGE;

	ret = efi_cmd->cmd(efi_cmd, flag, argc, argv);

	return cmd_process_error(efi_cmd, ret);
}

U_BOOT_CMD(
	efi,     3,      1,      do_efi,
	"EFI access",
	"mem [all]        Dump memory information [include boot services]"
);