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MIPS: Refactor 'clear_page' and 'copy_page' functions.

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Remove usage of the '__attribute__((alias("...")))' hack that aliased
to integer arrays containing micro-assembled instructions. This hack
breaks when building a microMIPS kernel. It also makes the code much
easier to understand.

[ralf@linux-mips.org: Added back export of the clear_page and copy_page
symbols so certain modules will work again.  Also fixed build with
CONFIG_SIBYTE_DMA_PAGEOPS enabled.]

Signed-off-by: Steven J. Hill <sjhill@mips.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/3866/
Acked-by: David Daney <david.daney@cavium.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Steven J. Hill
2012-07-06 21:56:01 +02:00
committed by Ralf Baechle
vanhempi 78d4803f75
commit c022630633
4 muutettua tiedostoa jossa 77 lisäystä ja 52 poistoa
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50
arch/mips/mm/page-funcs.S Normal file
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@@ -0,0 +1,50 @@
/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Micro-assembler generated clear_page/copy_page functions.
*
* Copyright (C) 2012 MIPS Technologies, Inc.
* Copyright (C) 2012 Ralf Baechle <ralf@linux-mips.org>
*/
#include <asm/asm.h>
#include <asm/regdef.h>
#ifdef CONFIG_SIBYTE_DMA_PAGEOPS
#define cpu_clear_page_function_name clear_page_cpu
#define cpu_copy_page_function_name copy_page_cpu
#else
#define cpu_clear_page_function_name clear_page
#define cpu_copy_page_function_name copy_page
#endif
/*
* Maximum sizes:
*
* R4000 128 bytes S-cache: 0x058 bytes
* R4600 v1.7: 0x05c bytes
* R4600 v2.0: 0x060 bytes
* With prefetching, 16 word strides 0x120 bytes
*/
EXPORT(__clear_page_start)
LEAF(cpu_clear_page_function_name)
1: j 1b /* Dummy, will be replaced. */
.space 288
END(cpu_clear_page_function_name)
EXPORT(__clear_page_end)
/*
* Maximum sizes:
*
* R4000 128 bytes S-cache: 0x11c bytes
* R4600 v1.7: 0x080 bytes
* R4600 v2.0: 0x07c bytes
* With prefetching, 16 word strides 0x540 bytes
*/
EXPORT(__copy_page_start)
LEAF(cpu_copy_page_function_name)
1: j 1b /* Dummy, will be replaced. */
.space 1344
END(cpu_copy_page_function_name)
EXPORT(__copy_page_end)