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: Che-Liang Chiou clchiou@chromium.org Signed-off-by: Simon Glass sjg@chromium.org --- Changes in v2: - Update README and add to Makefile
README | 8 ++++++++ include/physmem.h | 21 +++++++++++++++++++++ lib/Makefile | 1 + lib/physmem.c | 24 ++++++++++++++++++++++++ 4 files changed, 54 insertions(+), 0 deletions(-) create mode 100644 include/physmem.h create mode 100644 lib/physmem.c
diff --git a/README b/README index ed7d270..c7aab18 100644 --- a/README +++ b/README @@ -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
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/Makefile b/lib/Makefile index e44e045..f83f6e8 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -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 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")));