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efi: Support the efi command in the app

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At present the 'efi' command only works in the EFI payload. Update it to
work in the app too, so the memory map can be examined.

Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
This commit is contained in:
Simon Glass 2022-01-04 03:51:12 -07:00 committed by Heinrich Schuchardt
parent ce1dc0cc17
commit 25a326b006
4 changed files with 82 additions and 16 deletions
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2
cmd/Makefile
View File

@ -58,7 +58,7 @@ obj-$(CONFIG_CMD_EXTENSION) += extension_board.o
obj-$(CONFIG_CMD_ECHO) += echo.o
obj-$(CONFIG_ENV_IS_IN_EEPROM) += eeprom.o
obj-$(CONFIG_CMD_EEPROM) += eeprom.o
obj-$(CONFIG_EFI_STUB) += efi.o
obj-$(CONFIG_EFI) += efi.o
obj-$(CONFIG_CMD_EFIDEBUG) += efidebug.o
obj-$(CONFIG_CMD_ELF) += elf.o
obj-$(CONFIG_HUSH_PARSER) += exit.o

48
cmd/efi.c
View File

@ -13,6 +13,8 @@
#include <sort.h>
#include <asm/global_data.h>
DECLARE_GLOBAL_DATA_PTR;
static const char *const type_name[] = {
"reserved",
"loader_code",
@ -217,37 +219,53 @@ static void efi_print_mem_table(struct efi_mem_desc *desc, int desc_size,
static int do_efi_mem(struct cmd_tbl *cmdtp, int flag, int argc,
char *const argv[])
{
struct efi_mem_desc *desc;
struct efi_entry_memmap *map;
struct efi_mem_desc *orig, *desc;
uint version, key;
int desc_size;
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;
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, version %x, descr. size %#x\n",
gd->arch.table, map, size, map->version, map->desc_size);
if (map->version != EFI_MEM_DESC_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(map->desc, size, map->desc_size, skip_bs);
desc = efi_build_mem_table(orig, size, desc_size, skip_bs);
if (!desc) {
ret = -ENOMEM;
goto done;
}
efi_print_mem_table(desc, map->desc_size, skip_bs);
efi_print_mem_table(desc, desc_size, skip_bs);
free(desc);
if (IS_ENABLED(CONFIG_EFI_APP))
free(orig);
done:
if (ret)
printf("Error: %d\n", ret);

15
include/efi.h
View File

@ -610,4 +610,19 @@ int efi_store_memory_map(struct efi_priv *priv);
*/
int efi_call_exit_boot_services(void);
/**
* efi_get_mmap() - Get the memory map from EFI
*
* This is used in the app. The caller must free *@descp when done
*
* @descp: Returns allocated pointer to EFI memory map table
* @sizep: Returns size of table in bytes
* @keyp: Returns memory-map key
* @desc_sizep: Returns size of each @desc_base record
* @versionp: Returns version number of memory map
* @return 0 on success, -ve on error
*/
int efi_get_mmap(struct efi_mem_desc **descp, int *sizep, uint *keyp,
int *desc_sizep, uint *versionp);
#endif /* _LINUX_EFI_H */

33
lib/efi/efi_app.c
View File

@ -32,6 +32,39 @@ int efi_info_get(enum efi_entry_t type, void **datap, int *sizep)
return -ENOSYS;
}
int efi_get_mmap(struct efi_mem_desc **descp, int *sizep, uint *keyp,
int *desc_sizep, uint *versionp)
{
struct efi_priv *priv = efi_get_priv();
struct efi_boot_services *boot = priv->sys_table->boottime;
efi_uintn_t size, desc_size, key;
struct efi_mem_desc *desc;
efi_status_t ret;
u32 version;
/* Get the memory map so we can switch off EFI */
size = 0;
ret = boot->get_memory_map(&size, NULL, &key, &desc_size, &version);
if (ret != EFI_BUFFER_TOO_SMALL)
return log_msg_ret("get", -ENOMEM);
desc = malloc(size);
if (!desc)
return log_msg_ret("mem", -ENOMEM);
ret = boot->get_memory_map(&size, desc, &key, &desc_size, &version);
if (ret)
return log_msg_ret("get", -EINVAL);
*descp = desc;
*sizep = size;
*desc_sizep = desc_size;
*versionp = version;
*keyp = key;
return 0;
}
/**
* efi_bind_block() - bind a new block device to an EFI device
*