[U-Boot] [PATCH v3 21/28] efi: Add a command to display the memory map
Simon Glass
sjg at chromium.org
Tue Aug 4 20:33:59 CEST 2015
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>
Reviewed-by: Bin Meng <bmeng.cn at gmail.com>
Tested on QEMU
Tested-by: Bin Meng <bmeng.cn at gmail.com>
---
Changes in v3: None
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]"
+);
--
2.5.0.rc2.392.g76e840b
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