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efi_loader: Add exit support

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Some times you may want to exit an EFI payload again, for example
to default boot into a PXE installation and decide that you would
rather want to boot from the local disk instead.

This patch adds exit functionality to the EFI implementation, allowing
EFI payloads to exit.

Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Alexander Graf
2016-05-20 23:28:23 +02:00
committed by Tom Rini
parent 97d44b1f5c
commit a86aeaf228
3 changed files with 32 additions and 5 deletions
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21
lib/efi_loader/efi_boottime.c
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@@ -458,19 +458,30 @@ static efi_status_t EFIAPI efi_start_image(efi_handle_t image_handle,
efi_is_direct_boot = false;
/* call the image! */
if (setjmp(&info->exit_jmp)) {
/* We returned from the child image */
return EFI_EXIT(info->exit_status);
}
entry(image_handle, &systab);
/* Should usually never get here */
return EFI_EXIT(EFI_SUCCESS);
}
static efi_status_t EFIAPI efi_exit(void *image_handle, long exit_status,
unsigned long exit_data_size,
uint16_t *exit_data)
static efi_status_t EFIAPI efi_exit(efi_handle_t image_handle,
efi_status_t exit_status, unsigned long exit_data_size,
int16_t *exit_data)
{
struct efi_loaded_image *loaded_image_info = (void*)image_handle;
EFI_ENTRY("%p, %ld, %ld, %p", image_handle, exit_status,
exit_data_size, exit_data);
return EFI_EXIT(efi_unsupported(__func__));
loaded_image_info->exit_status = exit_status;
longjmp(&loaded_image_info->exit_jmp);
panic("EFI application exited");
}
static struct efi_object *efi_search_obj(void *handle)
@@ -746,7 +757,7 @@ static const struct efi_boot_services efi_boot_services = {
.install_configuration_table = efi_install_configuration_table,
.load_image = efi_load_image,
.start_image = efi_start_image,
.exit = (void*)efi_exit,
.exit = efi_exit,
.unload_image = efi_unload_image,
.exit_boot_services = efi_exit_boot_services,
.get_next_monotonic_count = efi_get_next_monotonic_count,