From patchwork Wed Oct 24 04:04:45 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [U-Boot, 14/15] Introduce arch_phys_memset which works like memset but on physical memory Date: Tue, 23 Oct 2012 18:04:45 -0000 From: Simon Glass X-Patchwork-Id: 193658 Message-Id: <1351051486-6980-15-git-send-email-sjg@chromium.org> To: U-Boot Mailing List From: Gabe Black 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 Signed-off-by: Simon Glass --- 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 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 +#include + +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")));