/** Load an EFI executable.
* @param _loader Pointer to loader data. */
static __noreturn void efi_loader_load(void *_loader) {
efi_loader_t *loader = _loader;
void *buf;
efi_handle_t image_handle;
efi_loaded_image_t *image;
efi_char16_t *str;
efi_uintn_t str_size;
efi_status_t status;
status_t ret;
/* Allocate a buffer to read the image into. */
buf = malloc_large(loader->handle->size);
/* Read it in. */
ret = fs_read(loader->handle, buf, loader->handle->size, 0);
if (ret != STATUS_SUCCESS)
boot_error("Error reading EFI image: %pS", ret);
/* Ask the firmware to load the image. */
status = efi_call(
efi_boot_services->load_image,
false, efi_image_handle, NULL, buf, loader->handle->size, &image_handle);
if (status != EFI_SUCCESS)
boot_error("Error loading EFI image (0x%zx)", status);
/* Get the loaded image protocol. */
status = efi_get_loaded_image(image_handle, &image);
if (status != EFI_SUCCESS)
boot_error("Error getting loaded image protocol (0x%zx)", status);
/* Try to identify the handle of the device the image was on. */
image->device_handle = efi_device_get_handle(loader->handle->mount->device);
image->file_path = loader->efi_path;
fs_close(loader->handle);
/* Convert the arguments to UTF-16. FIXME: UTF-8 internally? */
str_size = (strlen(loader->args.string) + 1) * sizeof(*str);
str = malloc(str_size);
for (size_t i = 0; i < str_size / sizeof(*str); i++)
str[i] = loader->args.string[i];
image->load_options = str;
image->load_options_size = str_size;
loader_preboot();
/* Free up extra memory we've allocated. */
efi_memory_cleanup();
/* Start the image. */
status = efi_call(efi_boot_services->start_image, image_handle, &str_size, &str);
if (status != EFI_SUCCESS)
dprintf("efi: loaded image returned status 0x%zx\n", status);
/* We can't do anything here - the loaded image may have done things making
* our internal state invalid. Just pass through the error to whatever
* loaded us. */
efi_exit(status, str, str_size);
}
static s64 __uv_bios_call(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3,
u64 a4, u64 a5)
{
struct uv_systab *tab = uv_systab;
s64 ret;
if (!tab || !tab->function)
/*
* BIOS does not support UV systab
*/
return BIOS_STATUS_UNIMPLEMENTED;
/*
* If EFI_OLD_MEMMAP is set, we need to fall back to using our old EFI
* callback method, which uses efi_call() directly, with the kernel page tables:
*/
if (unlikely(test_bit(EFI_OLD_MEMMAP, &efi.flags)))
ret = efi_call((void *)__va(tab->function), (u64)which, a1, a2, a3, a4, a5);
else
ret = efi_call_virt_pointer(tab, function, (u64)which, a1, a2, a3, a4, a5);
return ret;
}
