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efi_loader: bootmgr: support BootNext and BootCurrent variable behavior

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See UEFI v2.7, section 3.1.2 for details of the specification.

With efidebug command, you can run any EFI boot option as follows:
  => efi boot add 1 SHELL ...
  => efi boot add 2 HELLO ...
  => efi boot order 1 2
  => efi bootmgr
     (starting SHELL ...)

  => efi boot next 2
  => efi bootmgr
     (starting HELLO ...)
  => env print -e
  <snip ...>
  BootCurrent: {boot,run}(blob)
  00000000:  02 00                    ..
  BootOrder: {boot,run}(blob)
  00000000:  01 00 02 00              ....

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
AKASHI Takahiro 2019-03-20 09:07:55 +09:00 • committed by Heinrich Schuchardt
parent b0c3c346c6
commit 37279ad3ee
1 changed files with 47 additions and 4 deletions
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51
lib/efi_loader/efi_bootmgr.c
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@ -141,6 +141,7 @@ static void *try_load_entry(uint16_t n, struct efi_device_path **device_path,
efi_deserialize_load_option(&lo, load_option);
if (lo.attributes & LOAD_OPTION_ACTIVE) {
u32 attributes;
efi_status_t ret;
debug("%s: trying to load \"%ls\" from %pD\n",
@ -151,6 +152,16 @@ static void *try_load_entry(uint16_t n, struct efi_device_path **device_path,
if (ret != EFI_SUCCESS)
goto error;
attributes = EFI_VARIABLE_BOOTSERVICE_ACCESS |
EFI_VARIABLE_RUNTIME_ACCESS;
size = sizeof(n);
ret = EFI_CALL(efi_set_variable(
L"BootCurrent",
(efi_guid_t *)&efi_global_variable_guid,
attributes, size, &n));
if (ret != EFI_SUCCESS)
goto error;
printf("Booting: %ls\n", lo.label);
efi_dp_split_file_path(lo.file_path, device_path, file_path);
}
@ -162,21 +173,53 @@ error:
}
/*
* Attempt to load, in the order specified by BootOrder EFI variable, the
* available load-options, finding and returning the first one that can
* be loaded successfully.
* Attempt to load from BootNext or in the order specified by BootOrder
* EFI variable, the available load-options, finding and returning
* the first one that can be loaded successfully.
*/
void *efi_bootmgr_load(struct efi_device_path **device_path,
struct efi_device_path **file_path)
{
uint16_t *bootorder;
u16 bootnext, *bootorder;
efi_uintn_t size;
void *image = NULL;
int i, num;
efi_status_t ret;
bs = systab.boottime;
rs = systab.runtime;
/* BootNext */
bootnext = 0;
size = sizeof(bootnext);
ret = EFI_CALL(efi_get_variable(L"BootNext",
(efi_guid_t *)&efi_global_variable_guid,
NULL, &size, &bootnext));
if (ret == EFI_SUCCESS || ret == EFI_BUFFER_TOO_SMALL) {
/* BootNext does exist here */
if (ret == EFI_BUFFER_TOO_SMALL || size != sizeof(u16))
printf("BootNext must be 16-bit integer\n");
/* delete BootNext */
ret = EFI_CALL(efi_set_variable(
L"BootNext",
(efi_guid_t *)&efi_global_variable_guid,
0, 0, &bootnext));
/* load BootNext */
if (ret == EFI_SUCCESS) {
if (size == sizeof(u16)) {
image = try_load_entry(bootnext, device_path,
file_path);
if (image)
return image;
}
} else {
printf("Deleting BootNext failed\n");
}
}
/* BootOrder */
bootorder = get_var(L"BootOrder", &efi_global_variable_guid, &size);
if (!bootorder) {
printf("BootOrder not defined\n");