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MIPS: Refactor 'clear_page' and 'copy_page' functions.
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
Ralf Baechle
parent
78d4803f75
commit
c022630633
@ -5,7 +5,7 @@
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1996, 97, 98, 99, 2000, 01, 03, 04, 05 by Ralf Baechle
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* Copyright (C) 1996, 97, 98, 99, 2000, 01, 03, 04, 05, 12 by Ralf Baechle
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* Copyright (C) 1999, 2000, 01 Silicon Graphics, Inc.
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*/
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#include <linux/interrupt.h>
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@ -34,6 +34,12 @@ EXPORT_SYMBOL(memmove);
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EXPORT_SYMBOL(kernel_thread);
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/*
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* Functions that operate on entire pages. Mostly used by memory management.
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*/
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EXPORT_SYMBOL(clear_page);
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EXPORT_SYMBOL(copy_page);
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/*
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* Userspace access stuff.
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*/
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@ -3,8 +3,8 @@
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#
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obj-y += cache.o dma-default.o extable.o fault.o \
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gup.o init.o mmap.o page.o tlbex.o \
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tlbex-fault.o uasm.o
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gup.o init.o mmap.o page.o page-funcs.o \
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tlbex.o tlbex-fault.o uasm.o
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obj-$(CONFIG_32BIT) += ioremap.o pgtable-32.o
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obj-$(CONFIG_64BIT) += pgtable-64.o
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50
arch/mips/mm/page-funcs.S
Normal file
50
arch/mips/mm/page-funcs.S
Normal file
@ -0,0 +1,50 @@
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/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Micro-assembler generated clear_page/copy_page functions.
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*
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* Copyright (C) 2012 MIPS Technologies, Inc.
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* Copyright (C) 2012 Ralf Baechle <ralf@linux-mips.org>
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*/
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#include <asm/asm.h>
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#include <asm/regdef.h>
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#ifdef CONFIG_SIBYTE_DMA_PAGEOPS
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#define cpu_clear_page_function_name clear_page_cpu
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#define cpu_copy_page_function_name copy_page_cpu
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#else
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#define cpu_clear_page_function_name clear_page
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#define cpu_copy_page_function_name copy_page
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#endif
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/*
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* Maximum sizes:
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*
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* R4000 128 bytes S-cache: 0x058 bytes
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* R4600 v1.7: 0x05c bytes
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* R4600 v2.0: 0x060 bytes
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* With prefetching, 16 word strides 0x120 bytes
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*/
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EXPORT(__clear_page_start)
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LEAF(cpu_clear_page_function_name)
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1: j 1b /* Dummy, will be replaced. */
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.space 288
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END(cpu_clear_page_function_name)
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EXPORT(__clear_page_end)
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/*
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* Maximum sizes:
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*
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* R4000 128 bytes S-cache: 0x11c bytes
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* R4600 v1.7: 0x080 bytes
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* R4600 v2.0: 0x07c bytes
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* With prefetching, 16 word strides 0x540 bytes
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*/
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EXPORT(__copy_page_start)
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LEAF(cpu_copy_page_function_name)
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1: j 1b /* Dummy, will be replaced. */
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.space 1344
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END(cpu_copy_page_function_name)
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EXPORT(__copy_page_end)
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@ -6,6 +6,7 @@
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* Copyright (C) 2003, 04, 05 Ralf Baechle (ralf@linux-mips.org)
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* Copyright (C) 2007 Maciej W. Rozycki
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* Copyright (C) 2008 Thiemo Seufer
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* Copyright (C) 2012 MIPS Technologies, Inc.
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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@ -71,45 +72,6 @@ static struct uasm_reloc __cpuinitdata relocs[5];
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#define cpu_is_r4600_v1_x() ((read_c0_prid() & 0xfffffff0) == 0x00002010)
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#define cpu_is_r4600_v2_x() ((read_c0_prid() & 0xfffffff0) == 0x00002020)
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/*
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* Maximum sizes:
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*
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* R4000 128 bytes S-cache: 0x058 bytes
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* R4600 v1.7: 0x05c bytes
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* R4600 v2.0: 0x060 bytes
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* With prefetching, 16 word strides 0x120 bytes
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*/
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static u32 clear_page_array[0x120 / 4];
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#ifdef CONFIG_SIBYTE_DMA_PAGEOPS
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void clear_page_cpu(void *page) __attribute__((alias("clear_page_array")));
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#else
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void clear_page(void *page) __attribute__((alias("clear_page_array")));
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#endif
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EXPORT_SYMBOL(clear_page);
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/*
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* Maximum sizes:
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*
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* R4000 128 bytes S-cache: 0x11c bytes
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* R4600 v1.7: 0x080 bytes
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* R4600 v2.0: 0x07c bytes
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* With prefetching, 16 word strides 0x540 bytes
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*/
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static u32 copy_page_array[0x540 / 4];
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#ifdef CONFIG_SIBYTE_DMA_PAGEOPS
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void
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copy_page_cpu(void *to, void *from) __attribute__((alias("copy_page_array")));
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#else
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void copy_page(void *to, void *from) __attribute__((alias("copy_page_array")));
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#endif
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EXPORT_SYMBOL(copy_page);
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static int pref_bias_clear_store __cpuinitdata;
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static int pref_bias_copy_load __cpuinitdata;
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static int pref_bias_copy_store __cpuinitdata;
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@ -282,10 +244,15 @@ static inline void __cpuinit build_clear_pref(u32 **buf, int off)
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}
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}
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extern u32 __clear_page_start;
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extern u32 __clear_page_end;
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extern u32 __copy_page_start;
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extern u32 __copy_page_end;
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void __cpuinit build_clear_page(void)
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{
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int off;
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u32 *buf = (u32 *)&clear_page_array;
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u32 *buf = &__clear_page_start;
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struct uasm_label *l = labels;
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struct uasm_reloc *r = relocs;
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int i;
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@ -356,17 +323,17 @@ void __cpuinit build_clear_page(void)
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uasm_i_jr(&buf, RA);
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uasm_i_nop(&buf);
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BUG_ON(buf > clear_page_array + ARRAY_SIZE(clear_page_array));
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BUG_ON(buf > &__clear_page_end);
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uasm_resolve_relocs(relocs, labels);
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pr_debug("Synthesized clear page handler (%u instructions).\n",
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(u32)(buf - clear_page_array));
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(u32)(buf - &__clear_page_start));
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pr_debug("\t.set push\n");
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pr_debug("\t.set noreorder\n");
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for (i = 0; i < (buf - clear_page_array); i++)
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pr_debug("\t.word 0x%08x\n", clear_page_array[i]);
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for (i = 0; i < (buf - &__clear_page_start); i++)
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pr_debug("\t.word 0x%08x\n", (&__clear_page_start)[i]);
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pr_debug("\t.set pop\n");
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}
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@ -427,7 +394,7 @@ static inline void build_copy_store_pref(u32 **buf, int off)
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void __cpuinit build_copy_page(void)
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{
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int off;
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u32 *buf = (u32 *)©_page_array;
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u32 *buf = &__copy_page_start;
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struct uasm_label *l = labels;
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struct uasm_reloc *r = relocs;
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int i;
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@ -595,21 +562,23 @@ void __cpuinit build_copy_page(void)
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uasm_i_jr(&buf, RA);
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uasm_i_nop(&buf);
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BUG_ON(buf > copy_page_array + ARRAY_SIZE(copy_page_array));
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BUG_ON(buf > &__copy_page_end);
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uasm_resolve_relocs(relocs, labels);
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pr_debug("Synthesized copy page handler (%u instructions).\n",
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(u32)(buf - copy_page_array));
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(u32)(buf - &__copy_page_start));
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pr_debug("\t.set push\n");
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pr_debug("\t.set noreorder\n");
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for (i = 0; i < (buf - copy_page_array); i++)
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pr_debug("\t.word 0x%08x\n", copy_page_array[i]);
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for (i = 0; i < (buf - &__copy_page_start); i++)
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pr_debug("\t.word 0x%08x\n", (&__copy_page_start)[i]);
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pr_debug("\t.set pop\n");
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}
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#ifdef CONFIG_SIBYTE_DMA_PAGEOPS
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extern void clear_page_cpu(void *page);
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extern void copy_page_cpu(void *to, void *from);
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/*
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* Pad descriptors to cacheline, since each is exclusively owned by a
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