u-boot/cmd/efi.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * (C) Copyright 2015 Google, Inc
 * Written by Simon Glass <sjg@chromium.org>
 */

#include <command.h>
#include <efi.h>
#include <efi_api.h>
#include <efi_stub.h>
#include <errno.h>
#include <log.h>
#include <malloc.h>
#include <sort.h>
#include <u-boot/uuid.h>
#include <asm/global_data.h>

DECLARE_GLOBAL_DATA_PTR;

static bool is_app(void)
{
	if (!IS_ENABLED(CONFIG_EFI_APP)) {
		printf("This command is only available in the app\n");
		return false;
	}

	return true;
}

static int do_efi_image(struct cmd_tbl *cmdtp, int flag, int argc,
			char *const argv[])
{
	struct efi_loaded_image *lim;
	struct efi_priv *priv;
	u16 *path;

	if (!is_app())
		return CMD_RET_FAILURE;

	priv = efi_get_priv();
	lim = priv->loaded_image;
	path = efi_dp_str(lim->file_path);
	printf("Loaded-image path: %ls\n", path);

	return 0;
}

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;
}

/**
 * efi_build_mem_table() - make a sorted copy of the memory table
 *
 * @desc_base:	Pointer to EFI memory map table
 * @size:	Size of table in bytes
 * @desc_size:	Size of each @desc_base record
 * @skip_bs:	True to skip boot-time memory and merge it with conventional
 *		memory. This will significantly reduce the number of table
 *		entries.
 * Return:	pointer to the new table. It should be freed with free() by the
 *		caller.
 */
static void *efi_build_mem_table(struct efi_mem_desc *desc_base, int size,
				 int desc_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 = (void *)desc_base + size;
	count = ((ulong)end - (ulong)desc_base) / desc_size;
	memcpy(base, desc_base, (ulong)end - (ulong)desc_base);
	qsort(base, count, desc_size, h_cmp_entry);
	prev = NULL;
	addr = 0;
	dest = base;
	end = (struct efi_mem_desc *)((ulong)base + count * desc_size);
	for (desc = base; desc < end;
	     desc = efi_get_next_mem_desc(desc, desc_size)) {
		bool merge = true;
		u32 type = desc->type;

		if (type >= EFI_MAX_MEMORY_TYPE) {
			printf("Memory map contains invalid entry type %u\n",
			       type);
			continue;
		}

		if (skip_bs && efi_mem_is_boot_services(desc->type))
			type = EFI_CONVENTIONAL_MEMORY;

		memcpy(dest, desc, 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(dest, desc_size);
		}
		addr = desc->physical_start + (desc->num_pages <<
				EFI_PAGE_SHIFT);
	}

	/* Mark the end */
	dest->type = EFI_MAX_MEMORY_TYPE;

	return base;
}

static int do_efi_mem(struct cmd_tbl *cmdtp, int flag, int argc,
		      char *const argv[])
{
	struct efi_mem_desc *orig, *desc;
	uint version, key = 0;
	int desc_size;
	int size, ret;
	bool skip_bs;

	skip_bs = !argc || *argv[0] != 'a';
	if (IS_ENABLED(CONFIG_EFI_APP)) {
		ret = efi_get_mmap(&orig, &size, &key, &desc_size, &version);
		if (ret) {
			printf("Cannot read memory map (err=%d)\n", ret);
			return CMD_RET_FAILURE;
		}
	} else {
		struct efi_entry_memmap *map;

		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;
		}
		orig = map->desc;
		desc_size = map->desc_size;
		version = map->version;
	}
	printf("EFI table at %lx, memory map %p, size %x, key %x, version %x, descr. size %#x\n",
	       gd->arch.table, orig, size, key, version, desc_size);
	if (version != EFI_MEM_DESC_VERSION) {
		printf("Incorrect memory map version\n");
		ret = -EPROTONOSUPPORT;
		goto done;
	}

	desc = efi_build_mem_table(orig, size, desc_size, skip_bs);
	if (!desc) {
		ret = -ENOMEM;
		goto done;
	}

	efi_dump_mem_table(desc, size, desc_size, skip_bs);
	free(desc);
	if (IS_ENABLED(CONFIG_EFI_APP))
		free(orig);
done:
	if (ret)
		printf("Error: %d\n", ret);

	return ret ? CMD_RET_FAILURE : 0;
}

static int do_efi_tables(struct cmd_tbl *cmdtp, int flag, int argc,
			 char *const argv[])
{
	struct efi_system_table *systab;

	if (IS_ENABLED(CONFIG_EFI_APP)) {
		systab = efi_get_sys_table();
		if (!systab) {
			printf("Cannot read system table\n");
			return CMD_RET_FAILURE;
		}
	} else {
		int size;
		int ret;

		ret = efi_info_get(EFIET_SYS_TABLE, (void **)&systab, &size);
		if (ret)  /* this should not happen */
			return CMD_RET_FAILURE;
	}

	efi_show_tables(systab);

	return 0;
}

static int do_efi_memsync(struct cmd_tbl *cmdtp, int flag, int argc,
			  char *const argv[])
{
	bool verbose = false;
	int ret;

	if (!is_app() || IS_ENABLED(CONFIG_X86))
		return CMD_RET_FAILURE;
	if (argc > 1 && !strcmp(argv[1], "-v"))
		verbose = true;
	if (!working_fdt) {
		printf("No working FDT set\n");
		return CMD_RET_FAILURE;
	}

	ret = efi_mem_reserved_sync(working_fdt, verbose);
	if (ret < 0)
		return CMD_RET_FAILURE;

	return 0;
}

static struct cmd_tbl efi_commands[] = {
	U_BOOT_CMD_MKENT(image, 1, 1, do_efi_image, "", ""),
	U_BOOT_CMD_MKENT(mem, 1, 1, do_efi_mem, "", ""),
	U_BOOT_CMD_MKENT(memsync, 2, 1, do_efi_memsync, "", ""),
	U_BOOT_CMD_MKENT(tables, 1, 1, do_efi_tables, "", ""),
};

static int do_efi(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
{
	struct cmd_tbl *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,     4,      1,      do_efi,
	"EFI access",
	"image            Dump loaded-image info\n"
	"mem [all]        Dump memory information [include boot services]\n"
	"memsync [-v]     Sync EFI memory map with DT reserved-memory\n"
	"tables           Dump tables"
);