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efi: Add a command to display the memory map
The EFI memory map is passed from the stub to U-Boot in a table. Add a command to display it in a vaguely readable fashion. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com> Tested on QEMU Tested-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass
parent
16c220d0a7
commit
f1a0bafb58
@ -90,6 +90,7 @@ obj-$(CONFIG_CMD_DTT) += cmd_dtt.o
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obj-$(CONFIG_CMD_ECHO) += cmd_echo.o
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obj-$(CONFIG_ENV_IS_IN_EEPROM) += cmd_eeprom.o
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obj-$(CONFIG_CMD_EEPROM) += cmd_eeprom.o
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obj-$(CONFIG_EFI_STUB) += cmd_efi.o
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obj-$(CONFIG_CMD_ELF) += cmd_elf.o
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obj-$(CONFIG_SYS_HUSH_PARSER) += cmd_exit.o
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obj-$(CONFIG_CMD_EXT4) += cmd_ext4.o
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257
common/cmd_efi.c
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257
common/cmd_efi.c
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@ -0,0 +1,257 @@
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/*
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* (C) Copyright 2015 Google, Inc
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* Written by Simon Glass <sjg@chromium.org>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <command.h>
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#include <efi.h>
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#include <errno.h>
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#include <malloc.h>
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static const char *const type_name[] = {
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"reserved",
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"loader_code",
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"loader_data",
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"bs_code",
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"bs_data",
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"rt_code",
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"rt_data",
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"conv",
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"unusable",
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"acpi_reclaim",
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"acpi_nvs",
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"io",
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"io_port",
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"pal_code",
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};
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static struct attr_info {
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int shift;
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const char *name;
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} mem_attr[] = {
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{ EFI_MEMORY_UC_SHIFT, "uncached" },
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{ EFI_MEMORY_WC_SHIFT, "write-coalescing" },
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{ EFI_MEMORY_WT_SHIFT, "write-through" },
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{ EFI_MEMORY_WB_SHIFT, "write-back" },
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{ EFI_MEMORY_UCE_SHIFT, "uncached & exported" },
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{ EFI_MEMORY_WP_SHIFT, "write-protect" },
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{ EFI_MEMORY_RP_SHIFT, "read-protect" },
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{ EFI_MEMORY_XP_SHIFT, "execute-protect" },
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{ EFI_MEMORY_RUNTIME_SHIFT, "needs runtime mapping" }
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};
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/* Maximum different attribute values we can track */
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#define ATTR_SEEN_MAX 30
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static inline bool is_boot_services(int type)
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{
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return type == EFI_LOADER_CODE || type == EFI_LOADER_DATA ||
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type == EFI_BOOT_SERVICES_CODE ||
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type == EFI_BOOT_SERVICES_DATA;
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}
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static int h_cmp_entry(const void *v1, const void *v2)
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{
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const struct efi_mem_desc *desc1 = v1;
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const struct efi_mem_desc *desc2 = v2;
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int64_t diff = desc1->physical_start - desc2->physical_start;
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/*
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* Manually calculate the difference to avoid sign loss in the 64-bit
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* to 32-bit conversion
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*/
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return diff < 0 ? -1 : diff > 0 ? 1 : 0;
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}
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void *efi_build_mem_table(struct efi_entry_memmap *map, int size, bool skip_bs)
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{
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struct efi_mem_desc *desc, *end, *base, *dest, *prev;
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int count;
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u64 addr;
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base = malloc(size + sizeof(*desc));
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if (!base) {
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debug("%s: Cannot allocate %#x bytes\n", __func__, size);
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return NULL;
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}
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end = (struct efi_mem_desc *)((ulong)map + size);
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count = ((ulong)end - (ulong)map->desc) / map->desc_size;
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memcpy(base, map->desc, (ulong)end - (ulong)map->desc);
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qsort(base, count, map->desc_size, h_cmp_entry);
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prev = NULL;
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addr = 0;
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dest = base;
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end = base + count;
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for (desc = base; desc < end; desc = efi_get_next_mem_desc(map, desc)) {
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bool merge = true;
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int type = desc->type;
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if (skip_bs && is_boot_services(desc->type))
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type = EFI_CONVENTIONAL_MEMORY;
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memcpy(dest, desc, map->desc_size);
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dest->type = type;
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if (!skip_bs || !prev)
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merge = false;
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else if (desc->physical_start != addr)
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merge = false;
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else if (type != EFI_CONVENTIONAL_MEMORY)
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merge = false;
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else if (prev->type != EFI_CONVENTIONAL_MEMORY)
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merge = false;
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if (merge) {
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prev->num_pages += desc->num_pages;
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} else {
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prev = dest;
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dest = efi_get_next_mem_desc(map, dest);
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}
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addr = desc->physical_start + (desc->num_pages <<
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EFI_PAGE_SHIFT);
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}
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/* Mark the end */
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dest->type = EFI_TABLE_END;
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return base;
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}
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static void efi_print_mem_table(struct efi_entry_memmap *map,
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struct efi_mem_desc *desc, bool skip_bs)
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{
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u64 attr_seen[ATTR_SEEN_MAX];
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int attr_seen_count;
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int upto, i;
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u64 addr;
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printf(" # %-14s %10s %10s %10s %s\n", "Type", "Physical",
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"Virtual", "Size", "Attributes");
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/* Keep track of all the different attributes we have seen */
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attr_seen_count = 0;
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addr = 0;
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for (upto = 0; desc->type != EFI_TABLE_END;
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upto++, desc = efi_get_next_mem_desc(map, desc)) {
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const char *name;
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u64 size;
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if (skip_bs && is_boot_services(desc->type))
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continue;
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if (desc->physical_start != addr) {
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printf(" %-14s %010llx %10s %010llx\n", "<gap>",
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addr, "", desc->physical_start - addr);
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}
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size = desc->num_pages << EFI_PAGE_SHIFT;
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name = desc->type < ARRAY_SIZE(type_name) ?
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type_name[desc->type] : "<invalid>";
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printf("%2d %x:%-12s %010llx %010llx %010llx ", upto,
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desc->type, name, desc->physical_start,
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desc->virtual_start, size);
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if (desc->attribute & EFI_MEMORY_RUNTIME)
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putc('r');
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printf("%llx", desc->attribute & ~EFI_MEMORY_RUNTIME);
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putc('\n');
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for (i = 0; i < attr_seen_count; i++) {
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if (attr_seen[i] == desc->attribute)
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break;
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}
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if (i == attr_seen_count && i < ATTR_SEEN_MAX)
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attr_seen[attr_seen_count++] = desc->attribute;
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addr = desc->physical_start + size;
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}
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printf("\nAttributes key:\n");
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for (i = 0; i < attr_seen_count; i++) {
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u64 attr = attr_seen[i];
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bool first;
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int j;
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printf("%c%llx: ", attr & EFI_MEMORY_RUNTIME ? 'r' : ' ',
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attr & ~EFI_MEMORY_RUNTIME);
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for (j = 0, first = true; j < ARRAY_SIZE(mem_attr); j++) {
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if (attr & (1ULL << mem_attr[j].shift)) {
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if (first)
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first = false;
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else
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printf(", ");
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printf("%s", mem_attr[j].name);
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}
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}
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putc('\n');
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}
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if (skip_bs)
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printf("*Some areas are merged (use 'all' to see)\n");
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}
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static int do_efi_mem(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
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{
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struct efi_mem_desc *desc;
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struct efi_entry_memmap *map;
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int size, ret;
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bool skip_bs;
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skip_bs = !argc || *argv[0] != 'a';
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ret = efi_info_get(EFIET_MEMORY_MAP, (void **)&map, &size);
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switch (ret) {
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case -ENOENT:
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printf("No EFI table available\n");
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goto done;
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case -EPROTONOSUPPORT:
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printf("Incorrect EFI table version\n");
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goto done;
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}
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printf("EFI table at %lx, memory map %p, size %x, version %x, descr. size %#x\n",
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gd->arch.table, map, size, map->version, map->desc_size);
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if (map->version != EFI_MEM_DESC_VERSION) {
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printf("Incorrect memory map version\n");
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ret = -EPROTONOSUPPORT;
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goto done;
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}
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desc = efi_build_mem_table(map, size, skip_bs);
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if (!desc) {
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ret = -ENOMEM;
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goto done;
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}
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efi_print_mem_table(map, desc, skip_bs);
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free(desc);
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done:
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if (ret)
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printf("Error: %d\n", ret);
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return ret ? CMD_RET_FAILURE : 0;
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}
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static cmd_tbl_t efi_commands[] = {
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U_BOOT_CMD_MKENT(mem, 1, 1, do_efi_mem, "", ""),
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};
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static int do_efi(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
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{
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cmd_tbl_t *efi_cmd;
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int ret;
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if (argc < 2)
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return CMD_RET_USAGE;
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efi_cmd = find_cmd_tbl(argv[1], efi_commands, ARRAY_SIZE(efi_commands));
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argc -= 2;
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argv += 2;
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if (!efi_cmd || argc > efi_cmd->maxargs)
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return CMD_RET_USAGE;
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ret = efi_cmd->cmd(efi_cmd, flag, argc, argv);
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return cmd_process_error(efi_cmd, ret);
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}
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U_BOOT_CMD(
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efi, 3, 1, do_efi,
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"EFI access",
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"mem [all] Dump memory information [include boot services]"
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);
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