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>master
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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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