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>
This commit is contained in:
Gabe Black 2012-12-02 04:55:18 +00:00 committed by Simon Glass
parent ec516c4899
commit 40fef04906
4 changed files with 54 additions and 0 deletions

8
README
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@ -2200,6 +2200,14 @@ CBFS (Coreboot Filesystem) support
HERMES, IP860, RPXlite, LWMON,
FLAGADM, TQM8260
- Access to physical memory region (> 4GB)
Some basic support is provided for operations on memory not
normally accessible to U-Boot - e.g. some architectures
support access to more than 4GB of memory on 32-bit
machines using physical address extension or similar.
Define CONFIG_PHYSMEM to access this basic support, which
currently only supports clearing the memory.
- Error Recovery:
CONFIG_PANIC_HANG

21
include/physmem.h Normal file
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@ -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);

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@ -48,6 +48,7 @@ COBJS-$(CONFIG_LMB) += lmb.o
COBJS-y += ldiv.o
COBJS-$(CONFIG_MD5) += md5.o
COBJS-y += net_utils.o
COBJS-$(CONFIG_PHYSMEM) += physmem.o
COBJS-y += qsort.o
COBJS-$(CONFIG_SHA1) += sha1.o
COBJS-$(CONFIG_SHA256) += sha256.o

24
lib/physmem.c Normal file
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@ -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")));