Patchwork [U-Boot,14/15] Introduce arch_phys_memset which works like memset but on physical memory

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Submitter Simon Glass
Date Oct. 24, 2012, 4:04 a.m.
Message ID <1351051486-6980-15-git-send-email-sjg@chromium.org>
Download mbox | patch
Permalink /patch/193658/
State Superseded, archived
Delegated to: Simon Glass
Headers show

Comments

Simon Glass - Oct. 24, 2012, 4:04 a.m.
From: Gabe Black <gabeblack@chromium.org>

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: Simon Glass <sjg@chromium.org>
---
 include/physmem.h |   21 +++++++++++++++++++++
 lib/physmem.c     |   24 ++++++++++++++++++++++++
 2 files changed, 45 insertions(+), 0 deletions(-)
 create mode 100644 include/physmem.h
 create mode 100644 lib/physmem.c

Patch

diff --git a/include/physmem.h b/include/physmem.h
new file mode 100644
index 0000000..03d3a78
--- /dev/null
+++ b/include/physmem.h
@@ -0,0 +1,21 @@ 
+/*
+ * 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.
+ */
+
+/*
+ * These functions work like memset but operate on physical memory which may
+ * not be accessible directly.
+ *
+ * @param s	The physical address to start setting memory at.
+ * @param c	The character to set each byte of the region to.
+ * @param n	The number of bytes to set.
+ *
+ * @return	The physical address of the memory which was set.
+ */
+phys_addr_t arch_phys_memset(phys_addr_t s, int c, phys_size_t n);
diff --git a/lib/physmem.c b/lib/physmem.c
new file mode 100644
index 0000000..0f035ed
--- /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")));