Introduce arch_phys_memset which works like memset but on physical memory

The default implementation of this function is just memset, but other
implementations will be needed when physical memory isn't accessible by
U-Boot using normal addressing mechanisms.

Signed-off-by: Gabe Black <gabeblack@chromium.org>
Signed-off-by: Che-Liang Chiou <clchiou@chromium.org>
Signed-off-by: Simon Glass <sjg@chromium.org>

1 files changed, 24 insertions, 0 deletions

diff --git a/lib/physmem.c b/lib/physmem.c
new file mode 100644
index 0000000000..0f035edcbe
--- /dev/null
+++ b/lib/physmem.c
@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ */
+
+#include <common.h>
+#include <physmem.h>
+
+static phys_addr_t __arch_phys_memset(phys_addr_t s, int c, phys_size_t n)
+{
+	void *s_ptr = (void *)(uintptr_t)s;
+
+	assert(((phys_addr_t)(uintptr_t)s) == s);
+	assert(((phys_addr_t)(uintptr_t)(s + n)) == s + n);
+	return (phys_addr_t)(uintptr_t)memset(s_ptr, c, n);
+}
+
+phys_addr_t arch_phys_memset(phys_addr_t s, int c, phys_size_t n)
+	__attribute__((weak, alias("__arch_phys_memset")));