cmd: efidebug: add memmap command

"memmap" command prints uefi-specific memory map information.
=> efi memmap
Type             Start            End              Attributes
================ ================ ================ ==========
CONVENTIONAL     0000000040000000-000000007de27000 WB
RUNTIME DATA     000000007de27000-000000007de28000 WB|RT
RESERVED         000000007de28000-000000007de2a000 WB
RUNTIME DATA     000000007de2a000-000000007de2b000 WB|RT
RESERVED         000000007de2b000-000000007de2c000 WB
RUNTIME DATA     000000007de2c000-000000007de2d000 WB|RT
LOADER DATA      000000007de2d000-000000007ff37000 WB
RUNTIME CODE     000000007ff37000-000000007ff38000 WB|RT
LOADER DATA      000000007ff38000-0000000080000000 WB

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>

1 files changed, 126 insertions, 1 deletions

diff --git a/cmd/efidebug.c b/cmd/efidebug.c
index e3a2d093fb..5072a7b39b 100644
--- a/cmd/efidebug.c
+++ b/cmd/efidebug.c
@@ -335,6 +335,127 @@ static int do_efi_show_images(cmd_tbl_t *cmdtp, int flag,
 	return CMD_RET_SUCCESS;
 }
 
+static const char * const efi_mem_type_string[] = {
+	[EFI_RESERVED_MEMORY_TYPE] = "RESERVED",
+	[EFI_LOADER_CODE] = "LOADER CODE",
+	[EFI_LOADER_DATA] = "LOADER DATA",
+	[EFI_BOOT_SERVICES_CODE] = "BOOT CODE",
+	[EFI_BOOT_SERVICES_DATA] = "BOOT DATA",
+	[EFI_RUNTIME_SERVICES_CODE] = "RUNTIME CODE",
+	[EFI_RUNTIME_SERVICES_DATA] = "RUNTIME DATA",
+	[EFI_CONVENTIONAL_MEMORY] = "CONVENTIONAL",
+	[EFI_UNUSABLE_MEMORY] = "UNUSABLE MEM",
+	[EFI_ACPI_RECLAIM_MEMORY] = "ACPI RECLAIM MEM",
+	[EFI_ACPI_MEMORY_NVS] = "ACPI NVS",
+	[EFI_MMAP_IO] = "IO",
+	[EFI_MMAP_IO_PORT] = "IO PORT",
+	[EFI_PAL_CODE] = "PAL",
+};
+
+static const struct efi_mem_attrs {
+	const u64 bit;
+	const char *text;
+} efi_mem_attrs[] = {
+	{EFI_MEMORY_UC, "UC"},
+	{EFI_MEMORY_UC, "UC"},
+	{EFI_MEMORY_WC, "WC"},
+	{EFI_MEMORY_WT, "WT"},
+	{EFI_MEMORY_WB, "WB"},
+	{EFI_MEMORY_UCE, "UCE"},
+	{EFI_MEMORY_WP, "WP"},
+	{EFI_MEMORY_RP, "RP"},
+	{EFI_MEMORY_XP, "WP"},
+	{EFI_MEMORY_NV, "NV"},
+	{EFI_MEMORY_MORE_RELIABLE, "REL"},
+	{EFI_MEMORY_RO, "RO"},
+	{EFI_MEMORY_RUNTIME, "RT"},
+};
+
+/**
+ * print_memory_attributes() - print memory map attributes
+ * @attributes:	Attribute value
+ *
+ * Print memory map attributes
+ */
+static void print_memory_attributes(u64 attributes)
+{
+	int sep, i;
+
+	for (sep = 0, i = 0; i < ARRAY_SIZE(efi_mem_attrs); i++)
+		if (attributes & efi_mem_attrs[i].bit) {
+			if (sep) {
+				putc('|');
+			} else {
+				putc(' ');
+				sep = 1;
+			}
+			puts(efi_mem_attrs[i].text);
+		}
+}
+
+#define EFI_PHYS_ADDR_WIDTH (int)(sizeof(efi_physical_addr_t) * 2)
+
+/**
+ * do_efi_show_memmap() - show UEFI memory map
+ *
+ * @cmdtp:	Command table
+ * @flag:	Command flag
+ * @argc:	Number of arguments
+ * @argv:	Argument array
+ * Return:	CMD_RET_SUCCESS on success, CMD_RET_RET_FAILURE on failure
+ *
+ * Implement efidebug "memmap" sub-command.
+ * Show UEFI memory map.
+ */
+static int do_efi_show_memmap(cmd_tbl_t *cmdtp, int flag,
+			      int argc, char * const argv[])
+{
+	struct efi_mem_desc *memmap = NULL, *map;
+	efi_uintn_t map_size = 0;
+	const char *type;
+	int i;
+	efi_status_t ret;
+
+	ret = EFI_CALL(BS->get_memory_map(&map_size, memmap, NULL, NULL, NULL));
+	if (ret == EFI_BUFFER_TOO_SMALL) {
+		map_size += sizeof(struct efi_mem_desc); /* for my own */
+		ret = EFI_CALL(BS->allocate_pool(EFI_LOADER_DATA,
+						 map_size, (void *)&memmap));
+		if (ret != EFI_SUCCESS)
+			return CMD_RET_FAILURE;
+		ret = EFI_CALL(BS->get_memory_map(&map_size, memmap,
+						  NULL, NULL, NULL));
+	}
+	if (ret != EFI_SUCCESS) {
+		EFI_CALL(BS->free_pool(memmap));
+		return CMD_RET_FAILURE;
+	}
+
+	printf("Type             Start%.*s End%.*s Attributes\n",
+	       EFI_PHYS_ADDR_WIDTH - 5, spc, EFI_PHYS_ADDR_WIDTH - 3, spc);
+	printf("================ %.*s %.*s ==========\n",
+	       EFI_PHYS_ADDR_WIDTH, sep, EFI_PHYS_ADDR_WIDTH, sep);
+	for (i = 0, map = memmap; i < map_size / sizeof(*map); map++, i++) {
+		if (map->type < EFI_MAX_MEMORY_TYPE)
+			type = efi_mem_type_string[map->type];
+		else
+			type = "(unknown)";
+
+		printf("%-16s %.*llx-%.*llx", type,
+		       EFI_PHYS_ADDR_WIDTH,
+		       map->physical_start,
+		       EFI_PHYS_ADDR_WIDTH,
+		       map->physical_start + map->num_pages * EFI_PAGE_SIZE);
+
+		print_memory_attributes(map->attribute);
+		putc('\n');
+	}
+
+	EFI_CALL(BS->free_pool(memmap));
+
+	return CMD_RET_SUCCESS;
+}
+
 /**
  * do_efi_boot_add() - set UEFI load option
  *
@@ -845,6 +966,8 @@ static cmd_tbl_t cmd_efidebug_sub[] = {
 			 "", ""),
 	U_BOOT_CMD_MKENT(images, CONFIG_SYS_MAXARGS, 1, do_efi_show_images,
 			 "", ""),
+	U_BOOT_CMD_MKENT(memmap, CONFIG_SYS_MAXARGS, 1, do_efi_show_memmap,
+			 "", ""),
 };
 
 /**
@@ -911,7 +1034,9 @@ static char efidebug_help_text[] =
 	"efidebug dh\n"
 	"  - show uefi handles\n"
 	"efidebug images\n"
-	"  - show loaded images\n";
+	"  - show loaded images\n"
+	"efidebug memmap\n"
+	"  - show uefi memory map\n";
 #endif
 
 U_BOOT_CMD(