Added ability to boot the previously-booted loader if

[refind] / refind / lib.c

diff --git a/refind/lib.c b/refind/lib.c
index b4dc2ec888b6cc87a3a95e288cdd3228a1c147b9..057026589c502b104180d336c3a8cb2771b85b81 100644 (file)
--- a/refind/lib.c
+++ b/refind/lib.c
@@ -265,6 +265,43 @@ static EFI_STATUS FinishInitRefitLib(VOID)
     return EFI_SUCCESS;
 }
 
+//
+// EFI variable read and write functions
+//
+
+// From gummiboot: Retrieve a raw EFI variable.
+// Returns EFI status
+EFI_STATUS EfivarGetRaw(EFI_GUID *vendor, CHAR16 *name, CHAR8 **buffer, UINTN *size) {
+   CHAR8 *buf;
+   UINTN l;
+   EFI_STATUS err;
+
+   l = sizeof(CHAR16 *) * EFI_MAXIMUM_VARIABLE_SIZE;
+   buf = AllocatePool(l);
+   if (!buf)
+      return EFI_OUT_OF_RESOURCES;
+
+   err = refit_call5_wrapper(RT->GetVariable, name, vendor, NULL, &l, buf);
+   if (EFI_ERROR(err) == EFI_SUCCESS) {
+      *buffer = buf;
+      if (size)
+         *size = l;
+   } else
+      MyFreePool(buf);
+   return err;
+} // EFI_STATUS EfivarGetRaw()
+
+// From gummiboot: Set an EFI variable
+EFI_STATUS EfivarSetRaw(EFI_GUID *vendor, CHAR16 *name, CHAR8 *buf, UINTN size, BOOLEAN persistent) {
+   UINT32 flags;
+
+   flags = EFI_VARIABLE_BOOTSERVICE_ACCESS|EFI_VARIABLE_RUNTIME_ACCESS;
+   if (persistent)
+      flags |= EFI_VARIABLE_NON_VOLATILE;
+
+   return refit_call5_wrapper(RT->SetVariable, name, vendor, flags, size, buf);
+} // EFI_STATUS EfivarSetRaw()
+
 //
 // list functions
 //
@@ -2025,11 +2062,12 @@ BOOLEAN IsGuid(CHAR16 *UnknownString) {
 
    for (i = 0; i < Length; i++) {
       a = UnknownString[i];
-      if (((i == 8) || (i == 13) || (i == 18) || (i == 23)) && (a != '-')) {
-         retval = FALSE;
+      if ((i == 8) || (i == 13) || (i == 18) || (i == 23)) {
+         if (a != '-')
+            retval = FALSE;
       } else if (((a < 'a') || (a > 'f')) && ((a < 'A') || (a > 'F')) && ((a < '0') && (a > '9'))) {
          retval = FALSE;
-      } // if/else
+      } // if/else if
    } // for
    return retval;
 } // BOOLEAN IsGuid()