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[fallback] For HD() device paths, use just the media node and later.
UEFI 2.x section 3.1.2 provides for "short-form device path", where the first element specified is a "hard drive media device path", so that you can move a disk around on different buses without invalidating your device path. Fallback has not been using this option, though in most cases efibootmgr has. Note that we still keep the full device path, because LoadImage() isn't necessarily the layer where HD() works - one some systems BDS is responsible for resolving the full path and passes that to LoadImage() instead. So we have to do LoadImage() with the full path.
This commit is contained in:
Peter Jones
parent
1762111831
commit
6edc6ec0a3
103
fallback.c
103
fallback.c
@ -14,6 +14,27 @@
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EFI_LOADED_IMAGE *this_image = NULL;
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static EFI_STATUS
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FindSubDevicePath(EFI_DEVICE_PATH *In, UINT8 Type, UINT8 SubType,
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EFI_DEVICE_PATH **Out)
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{
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EFI_DEVICE_PATH *dp = In;
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if (!In || !Out)
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return EFI_INVALID_PARAMETER;
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for (dp = In; !IsDevicePathEnd(dp); dp = NextDevicePathNode(dp)) {
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if (DevicePathType(dp) == Type &&
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DevicePathSubType(dp) == SubType) {
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*Out = DuplicateDevicePath(dp);
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if (!*Out)
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return EFI_OUT_OF_RESOURCES;
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return EFI_SUCCESS;
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}
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}
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*Out = NULL;
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return EFI_NOT_FOUND;
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}
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static EFI_STATUS
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get_file_size(EFI_FILE_HANDLE fh, UINTN *retsize)
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{
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@ -93,7 +114,9 @@ make_full_path(CHAR16 *dirname, CHAR16 *filename, CHAR16 **out, UINT64 *outlen)
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{
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UINT64 len;
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len = StrLen(dirname) + StrLen(filename) + StrLen(L"\\EFI\\\\") + 2;
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len = StrLen(L"\\EFI\\") + StrLen(dirname)
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+ StrLen(L"\\") + StrLen(filename)
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+ 2;
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CHAR16 *fullpath = AllocateZeroPool(len*sizeof(CHAR16));
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if (!fullpath) {
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@ -119,7 +142,8 @@ VOID *first_new_option_args = NULL;
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UINTN first_new_option_size = 0;
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EFI_STATUS
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add_boot_option(EFI_DEVICE_PATH *dp, CHAR16 *filename, CHAR16 *label, CHAR16 *arguments)
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add_boot_option(EFI_DEVICE_PATH *hddp, EFI_DEVICE_PATH *fulldp,
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CHAR16 *filename, CHAR16 *label, CHAR16 *arguments)
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{
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static int i = 0;
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CHAR16 varname[] = L"Boot0000";
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@ -136,24 +160,31 @@ add_boot_option(EFI_DEVICE_PATH *dp, CHAR16 *filename, CHAR16 *label, CHAR16 *ar
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void *var = LibGetVariable(varname, &global);
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if (!var) {
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int size = sizeof(UINT32) + sizeof (UINT16) +
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StrLen(label)*2 + 2 + DevicePathSize(dp) +
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StrLen(arguments) * 2 + 2;
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StrLen(label)*2 + 2 + DevicePathSize(hddp) +
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StrLen(arguments) * 2;
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CHAR8 *data = AllocateZeroPool(size);
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CHAR8 *cursor = data;
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*(UINT32 *)cursor = LOAD_OPTION_ACTIVE;
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cursor += sizeof (UINT32);
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*(UINT16 *)cursor = DevicePathSize(dp);
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*(UINT16 *)cursor = DevicePathSize(hddp);
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cursor += sizeof (UINT16);
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StrCpy((CHAR16 *)cursor, label);
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cursor += StrLen(label)*2 + 2;
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CopyMem(cursor, dp, DevicePathSize(dp));
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cursor += DevicePathSize(dp);
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CopyMem(cursor, hddp, DevicePathSize(hddp));
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cursor += DevicePathSize(hddp);
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StrCpy((CHAR16 *)cursor, arguments);
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Print(L"Creating boot entry \"%s\" with label \"%s\" "
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L"for file \"%s\"\n",
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varname, label, filename);
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if (!first_new_option) {
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first_new_option = DuplicateDevicePath(fulldp);
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first_new_option_args = arguments;
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first_new_option_size = StrLen(arguments) * sizeof (CHAR16);
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}
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rc = uefi_call_wrapper(RT->SetVariable, 5, varname,
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&global, EFI_VARIABLE_NON_VOLATILE |
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EFI_VARIABLE_BOOTSERVICE_ACCESS |
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@ -254,7 +285,10 @@ add_to_boot_list(EFI_FILE_HANDLE fh, CHAR16 *dirname, CHAR16 *filename, CHAR16 *
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if (EFI_ERROR(rc))
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return rc;
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EFI_DEVICE_PATH *dph = NULL, *dpf = NULL, *dp = NULL;
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EFI_DEVICE_PATH *dph = NULL;
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EFI_DEVICE_PATH *file = NULL;
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EFI_DEVICE_PATH *full_device_path = NULL;
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EFI_DEVICE_PATH *dp = NULL;
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dph = DevicePathFromHandle(this_image->DeviceHandle);
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if (!dph) {
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@ -262,19 +296,31 @@ add_to_boot_list(EFI_FILE_HANDLE fh, CHAR16 *dirname, CHAR16 *filename, CHAR16 *
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goto err;
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}
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dpf = FileDevicePath(fh, fullpath);
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if (!dpf) {
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file = FileDevicePath(fh, fullpath);
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if (!file) {
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rc = EFI_OUT_OF_RESOURCES;
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goto err;
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}
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dp = AppendDevicePath(dph, dpf);
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if (!dp) {
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full_device_path = AppendDevicePath(dph, file);
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if (!full_device_path) {
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rc = EFI_OUT_OF_RESOURCES;
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goto err;
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}
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rc = FindSubDevicePath(full_device_path,
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MEDIA_DEVICE_PATH, MEDIA_HARDDRIVE_DP, &dp);
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if (EFI_ERROR(rc)) {
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if (rc == EFI_NOT_FOUND) {
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dp = full_device_path;
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} else {
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rc = EFI_OUT_OF_RESOURCES;
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goto err;
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}
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}
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#ifdef DEBUG_FALLBACK
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{
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UINTN s = DevicePathSize(dp);
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int i;
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UINT8 *dpv = (void *)dp;
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@ -287,20 +333,16 @@ add_to_boot_list(EFI_FILE_HANDLE fh, CHAR16 *dirname, CHAR16 *filename, CHAR16 *
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CHAR16 *dps = DevicePathToStr(dp);
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Print(L"device path: \"%s\"\n", dps);
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#endif
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if (!first_new_option) {
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CHAR16 *dps = DevicePathToStr(dp);
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Print(L"device path: \"%s\"\n", dps);
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first_new_option = DuplicateDevicePath(dp);
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first_new_option_args = arguments;
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first_new_option_size = StrLen(arguments) * sizeof (CHAR16);
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}
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#endif
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add_boot_option(dp, fullpath, label, arguments);
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add_boot_option(dp, full_device_path, fullpath, label, arguments);
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err:
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if (dpf)
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FreePool(dpf);
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if (file)
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FreePool(file);
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if (full_device_path)
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FreePool(full_device_path);
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if (dp)
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FreePool(dp);
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if (fullpath)
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@ -629,8 +671,19 @@ try_start_first_option(EFI_HANDLE parent_image_handle)
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first_new_option, NULL, 0,
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&image_handle);
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if (EFI_ERROR(rc)) {
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Print(L"LoadImage failed: %d\n", rc);
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uefi_call_wrapper(BS->Stall, 1, 2000000);
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CHAR16 *dps = DevicePathToStr(first_new_option);
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UINTN s = DevicePathSize(first_new_option);
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int i;
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UINT8 *dpv = (void *)first_new_option;
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Print(L"LoadImage failed: %d\nDevice path: \"%s\"\n", rc, dps);
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for (i = 0; i < s; i++) {
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if (i > 0 && i % 16 == 0)
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Print(L"\n");
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Print(L"%02x ", dpv[i]);
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}
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Print(L"\n");
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uefi_call_wrapper(BS->Stall, 1, 500000000);
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return rc;
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}
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@ -644,7 +697,7 @@ try_start_first_option(EFI_HANDLE parent_image_handle)
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rc = uefi_call_wrapper(BS->StartImage, 3, image_handle, NULL, NULL);
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if (EFI_ERROR(rc)) {
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Print(L"StartImage failed: %d\n", rc);
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uefi_call_wrapper(BS->Stall, 1, 2000000);
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uefi_call_wrapper(BS->Stall, 1, 500000000);
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}
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return rc;
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}
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