proxmox-mirrors/efi-boot-shim
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Make the image loading process more generic

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Gary Ching-Pang Lin 2012-09-07 17:43:21 +08:00
parent ffc0e2424b
commit 822d089e3d
1 changed files with 42 additions and 26 deletions
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68
shim.c
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@ -606,7 +606,7 @@ static EFI_STATUS read_header(void *data,
/*
* Once the image has been loaded it needs to be validated and relocated
*/
static EFI_STATUS handle_grub (void *data, int datasize, EFI_LOADED_IMAGE *li)
static EFI_STATUS handle_image (void *data, int datasize, EFI_LOADED_IMAGE *li)
{
EFI_STATUS efi_status;
char *buffer;
@ -684,7 +684,8 @@ static EFI_STATUS handle_grub (void *data, int datasize, EFI_LOADED_IMAGE *li)
return EFI_SUCCESS;
}
static EFI_STATUS generate_path(EFI_LOADED_IMAGE *li, EFI_DEVICE_PATH **grubpath, CHAR16 **PathName)
static EFI_STATUS generate_path(EFI_LOADED_IMAGE *li, CHAR16 *ImagePath,
EFI_DEVICE_PATH **grubpath, CHAR16 **PathName)
{
EFI_DEVICE_PATH *devpath;
EFI_HANDLE device;
@ -710,7 +711,7 @@ static EFI_STATUS generate_path(EFI_LOADED_IMAGE *li, EFI_DEVICE_PATH **grubpath
if (bootpath[i-i] == '\\')
bootpath[i] = '\0';
*PathName = AllocatePool(StrSize(bootpath) + StrSize(SECOND_STAGE));
*PathName = AllocatePool(StrSize(bootpath) + StrSize(ImagePath));
if (!*PathName) {
Print(L"Failed to allocate path buffer\n");
@ -720,7 +721,7 @@ static EFI_STATUS generate_path(EFI_LOADED_IMAGE *li, EFI_DEVICE_PATH **grubpath
*PathName[0] = '\0';
StrCat(*PathName, bootpath);
StrCat(*PathName, SECOND_STAGE);
StrCat(*PathName, ImagePath);
*grubpath = FileDevicePath(device, *PathName);
@ -731,8 +732,8 @@ error:
/*
* Locate the second stage bootloader and read it into a buffer
*/
static EFI_STATUS load_grub (EFI_LOADED_IMAGE *li, void **data,
int *datasize, CHAR16 *PathName)
static EFI_STATUS load_image (EFI_LOADED_IMAGE *li, void **data,
int *datasize, CHAR16 *PathName)
{
EFI_GUID simple_file_system_protocol = SIMPLE_FILE_SYSTEM_PROTOCOL;
EFI_GUID file_info_id = EFI_FILE_INFO_ID;
@ -853,16 +854,45 @@ EFI_STATUS shim_verify (void *buffer, UINT32 size)
return status;
}
EFI_STATUS start_image(EFI_HANDLE image_handle, EFI_LOADED_IMAGE *li, CHAR16 *PathName)
{
EFI_STATUS efi_status;
EFI_LOADED_IMAGE li_bak;
void *data = NULL;
int datasize;
efi_status = load_image(li, &data, &datasize, PathName);
if (efi_status != EFI_SUCCESS) {
Print(L"Failed to load image\n");
goto done;
}
CopyMem(&li_bak, li, sizeof(li_bak));
efi_status = handle_image(data, datasize, li);
if (efi_status != EFI_SUCCESS) {
Print(L"Failed to load image\n");
CopyMem(li, &li_bak, sizeof(li_bak));
goto done;
}
efi_status = uefi_call_wrapper(entry_point, 3, image_handle, systab);
CopyMem(li, &li_bak, sizeof(li_bak));
done:
return efi_status;
}
EFI_STATUS init_grub(EFI_HANDLE image_handle)
{
EFI_STATUS efi_status;
EFI_HANDLE grub_handle = NULL;
EFI_LOADED_IMAGE *li, li_bak;
EFI_LOADED_IMAGE *li;
EFI_DEVICE_PATH *grubpath;
CHAR16 *PathName;
EFI_GUID loaded_image_protocol = LOADED_IMAGE_PROTOCOL;
void *data = NULL;
int datasize;
efi_status = uefi_call_wrapper(BS->HandleProtocol, 3, image_handle,
&loaded_image_protocol, &li);
@ -872,7 +902,7 @@ EFI_STATUS init_grub(EFI_HANDLE image_handle)
return efi_status;
}
efi_status = generate_path(li, &grubpath, &PathName);
efi_status = generate_path(li, SECOND_STAGE, &grubpath, &PathName);
if (efi_status != EFI_SUCCESS) {
Print(L"Unable to generate grub path\n");
@ -892,26 +922,12 @@ EFI_STATUS init_grub(EFI_HANDLE image_handle)
goto done;
}
efi_status = load_grub(li, &data, &datasize, PathName);
efi_status = start_image(image_handle, li, PathName);
if (efi_status != EFI_SUCCESS) {
Print(L"Failed to load grub\n");
Print(L"Failed to start grub\n");
goto done;
}
CopyMem(&li_bak, li, sizeof(li_bak));
efi_status = handle_grub(data, datasize, li);
if (efi_status != EFI_SUCCESS) {
Print(L"Failed to load grub\n");
CopyMem(li, &li_bak, sizeof(li_bak));
goto done;
}
efi_status = uefi_call_wrapper(entry_point, 3, image_handle, systab);
CopyMem(li, &li_bak, sizeof(li_bak));
done:
return efi_status;