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chainload: EFI workarounds

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This commit is contained in:
mintsuki 2021-05-12 12:53:06 +02:00
parent f650e4b41b
commit 12ec203f46
1 changed files with 27 additions and 4 deletions
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31
stage23/protos/chainload.c
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@ -116,6 +116,7 @@ void chainload(char *config) {
panic("chainload: Could not open image");
void *ptr = freadall(image, MEMMAP_EFI_LOADER);
size_t image_size = image->size;
term_deinit();
@ -140,21 +141,43 @@ void chainload(char *config) {
memdev_path[0].MemoryType = EfiLoaderData;
memdev_path[0].StartingAddress = (uintptr_t)ptr;
memdev_path[0].EndingAddress = (uintptr_t)ptr + image->size;
memdev_path[0].EndingAddress = (uintptr_t)ptr + image_size;
memdev_path[1].Header.Type = END_DEVICE_PATH_TYPE;
memdev_path[1].Header.SubType = END_ENTIRE_DEVICE_PATH_SUBTYPE;
memdev_path[1].Header.Length[0] = sizeof(MEMMAP_DEVICE_PATH);
memdev_path[1].Header.Length[1] = sizeof(MEMMAP_DEVICE_PATH) >> 8;
memdev_path[1].Header.Length[0] = sizeof(EFI_DEVICE_PATH);
memdev_path[1].Header.Length[1] = sizeof(EFI_DEVICE_PATH) >> 8;
EFI_HANDLE new_handle = 0;
status = uefi_call_wrapper(gBS->LoadImage, 6, 0, efi_image_handle, memdev_path,
ptr, image->size, &new_handle);
ptr, image_size, &new_handle);
if (status) {
panic("chainload: LoadImage failure (%x)", status);
}
// Apparently we need to make sure that the DeviceHandle field is the same
// as us (the loader) for some EFI images to properly work (Windows for instance)
EFI_GUID loaded_img_prot_guid = EFI_LOADED_IMAGE_PROTOCOL_GUID;
EFI_LOADED_IMAGE_PROTOCOL *loader_loaded_image = NULL;
status = uefi_call_wrapper(gBS->HandleProtocol, 3,
efi_image_handle, &loaded_img_prot_guid,
&loader_loaded_image);
if (status) {
panic("HandleProtocol failure (%x)\n", status);
}
EFI_LOADED_IMAGE_PROTOCOL *new_handle_loaded_image = NULL;
status = uefi_call_wrapper(gBS->HandleProtocol, 3,
new_handle, &loaded_img_prot_guid,
&new_handle_loaded_image);
if (status) {
panic("HandleProtocol failure (%x)\n", status);
}
new_handle_loaded_image->DeviceHandle = loader_loaded_image->DeviceHandle;
status = uefi_call_wrapper(gBS->StartImage, 3, new_handle, NULL, NULL);
if (status) {
panic("chainload: StartImage failure (%x)", status);