From 031e5cce385d3f96b1caa1d53495332a7eb03749 Mon Sep 17 00:00:00 2001
From: Steve McIntyre <steve@einval.com>
Date: Tue, 23 Mar 2021 23:49:46 +0000
Subject: New upstream version 15.3

---
 gnu-efi/lib/runtime/rtlock.c | 102 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 102 insertions(+)
 create mode 100644 gnu-efi/lib/runtime/rtlock.c

(limited to 'gnu-efi/lib/runtime/rtlock.c')

diff --git a/gnu-efi/lib/runtime/rtlock.c b/gnu-efi/lib/runtime/rtlock.c
new file mode 100644
index 00000000..2eafdca1
--- /dev/null
+++ b/gnu-efi/lib/runtime/rtlock.c
@@ -0,0 +1,102 @@
+/*++
+
+Copyright (c) 1998  Intel Corporation
+
+Module Name:
+
+    lock.c
+
+Abstract:
+
+    Implements FLOCK
+
+
+
+Revision History
+
+--*/
+
+
+#include "lib.h"
+
+
+
+#ifndef __GNUC__
+#pragma RUNTIME_CODE(RtAcquireLock)
+#endif
+VOID
+RtAcquireLock (
+    IN FLOCK    *Lock
+    )
+/*++
+
+Routine Description:
+
+    Raising to the task priority level of the mutual exclusion
+    lock, and then acquires ownership of the lock.
+    
+Arguments:
+
+    Lock        - The lock to acquire
+    
+Returns:
+
+    Lock owned
+
+--*/
+{
+    if (BS) {
+        if (BS->RaiseTPL != NULL) {
+            Lock->OwnerTpl = uefi_call_wrapper(BS->RaiseTPL, 1, Lock->Tpl);
+        } 
+    }
+    else {
+        if (LibRuntimeRaiseTPL != NULL) {
+            Lock->OwnerTpl = LibRuntimeRaiseTPL(Lock->Tpl);
+        }
+    }
+    Lock->Lock += 1;
+    ASSERT (Lock->Lock == 1);
+}
+
+
+#ifndef __GNUC__
+#pragma RUNTIME_CODE(RtAcquireLock)
+#endif
+VOID
+RtReleaseLock (
+    IN FLOCK    *Lock
+    )
+/*++
+
+Routine Description:
+
+    Releases ownership of the mutual exclusion lock, and
+    restores the previous task priority level.
+    
+Arguments:
+
+    Lock        - The lock to release
+    
+Returns:
+
+    Lock unowned
+
+--*/
+{
+    EFI_TPL     Tpl;
+
+    Tpl = Lock->OwnerTpl;
+    ASSERT(Lock->Lock == 1);
+    Lock->Lock -= 1;
+    if (BS) {
+        if (BS->RestoreTPL != NULL) {
+            uefi_call_wrapper(BS->RestoreTPL, 1, Tpl);
+        } 
+    }
+    else {
+        if (LibRuntimeRestoreTPL != NULL) {
+            LibRuntimeRestoreTPL(Tpl);
+        }
+    }
+}
-- 
cgit v1.2.3