[U-Boot] [PATCH v2 41/47] efi: Add a command to display the memory map
Bin Meng
bmeng.cn at gmail.com
Tue Aug 4 09:51:23 CEST 2015
On Fri, Jul 31, 2015 at 11:31 PM, Simon Glass <sjg at chromium.org> wrote:
> 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 at chromium.org>
> ---
>
> Changes in v2:
> - Drop a left-over debug printf()
> - Fix alignment of region index field in the output
> - Fix efi_mem_desc_VERSION typo
> - Output the region index in decimal
>
> common/Makefile | 1 +
> common/cmd_efi.c | 257 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
> 2 files changed, 258 insertions(+)
> create mode 100644 common/cmd_efi.c
>
> diff --git a/common/Makefile b/common/Makefile
> index d6c1d48..6dc4c89 100644
> --- a/common/Makefile
> +++ b/common/Makefile
> @@ -90,6 +90,7 @@ obj-$(CONFIG_CMD_DTT) += cmd_dtt.o
> obj-$(CONFIG_CMD_ECHO) += cmd_echo.o
> obj-$(CONFIG_ENV_IS_IN_EEPROM) += cmd_eeprom.o
> obj-$(CONFIG_CMD_EEPROM) += cmd_eeprom.o
> +obj-$(CONFIG_EFI_STUB) += cmd_efi.o
> obj-$(CONFIG_CMD_ELF) += cmd_elf.o
> obj-$(CONFIG_SYS_HUSH_PARSER) += cmd_exit.o
> obj-$(CONFIG_CMD_EXT4) += cmd_ext4.o
> diff --git a/common/cmd_efi.c b/common/cmd_efi.c
> new file mode 100644
> index 0000000..c76296e
> --- /dev/null
> +++ b/common/cmd_efi.c
> @@ -0,0 +1,257 @@
> +/*
> + * (C) Copyright 2015 Google, Inc
> + * Written by Simon Glass <sjg at chromium.org>
> + *
> + * SPDX-License-Identifier: GPL-2.0+
> + */
> +
> +#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 = base + count;
> + 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]"
> +);
> --
Reviewed-by: Bin Meng <bmeng.cn at gmail.com>
Tested on QEMU
Tested-by: Bin Meng <bmeng.cn at gmail.com>
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