275 lines
6.4 KiB
ArmAsm
275 lines
6.4 KiB
ArmAsm
/* $NetBSD: bcopy_page.S,v 1.8 2005/12/11 12:16:41 christos Exp $ */
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/*
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* Copyright (c) 1995 Scott Stevens
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Scott Stevens.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* RiscBSD kernel project
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*
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* bcopy_page.S
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*
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* page optimised bcopy and bzero routines
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*
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* Created : 08/04/95
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*/
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#include <machine/asm.h>
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#include "assym.h"
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#ifndef __XSCALE__
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/* #define BIG_LOOPS */
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/*
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* bcopy_page(src, dest)
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*
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* Optimised copy page routine.
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*
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* On entry:
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* r0 - src address
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* r1 - dest address
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*
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* Requires:
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* number of bytes per page (PAGE_SIZE) is a multiple of 512 (BIG_LOOPS), 128
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* otherwise.
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*/
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#define CHUNK_SIZE 32
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#define PREFETCH_FIRST_CHUNK /* nothing */
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#define PREFETCH_NEXT_CHUNK /* nothing */
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#ifndef COPY_CHUNK
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#define COPY_CHUNK \
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PREFETCH_NEXT_CHUNK ; \
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ldmia r0!, {r3-r8,ip,lr} ; \
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stmia r1!, {r3-r8,ip,lr}
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#endif /* ! COPY_CHUNK */
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#ifndef SAVE_REGS
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#define SAVE_REGS stmfd sp!, {r4-r8, lr}
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#define RESTORE_REGS ldmfd sp!, {r4-r8, pc}
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#endif
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ENTRY(bcopy_page)
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PREFETCH_FIRST_CHUNK
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SAVE_REGS
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#ifdef BIG_LOOPS
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mov r2, #(PAGE_SIZE >> 9)
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#else
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mov r2, #(PAGE_SIZE >> 7)
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#endif
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1:
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COPY_CHUNK
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COPY_CHUNK
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COPY_CHUNK
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COPY_CHUNK
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#ifdef BIG_LOOPS
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/* There is little point making the loop any larger; unless we are
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running with the cache off, the load/store overheads will
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completely dominate this loop. */
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COPY_CHUNK
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COPY_CHUNK
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COPY_CHUNK
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COPY_CHUNK
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COPY_CHUNK
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COPY_CHUNK
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COPY_CHUNK
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COPY_CHUNK
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COPY_CHUNK
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COPY_CHUNK
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COPY_CHUNK
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COPY_CHUNK
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#endif
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subs r2, r2, #1
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bne 1b
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RESTORE_REGS /* ...and return. */
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/*
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* bzero_page(dest)
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*
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* Optimised zero page routine.
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*
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* On entry:
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* r0 - dest address
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*
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* Requires:
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* number of bytes per page (PAGE_SIZE) is a multiple of 512 (BIG_LOOPS), 128
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* otherwise
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*/
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ENTRY(bzero_page)
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stmfd sp!, {r4-r8, lr}
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#ifdef BIG_LOOPS
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mov r2, #(PAGE_SIZE >> 9)
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#else
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mov r2, #(PAGE_SIZE >> 7)
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#endif
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mov r3, #0
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mov r4, #0
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mov r5, #0
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mov r6, #0
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mov r7, #0
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mov r8, #0
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mov ip, #0
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mov lr, #0
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1:
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stmia r0!, {r3-r8,ip,lr}
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stmia r0!, {r3-r8,ip,lr}
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stmia r0!, {r3-r8,ip,lr}
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stmia r0!, {r3-r8,ip,lr}
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#ifdef BIG_LOOPS
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/* There is little point making the loop any larger; unless we are
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running with the cache off, the load/store overheads will
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completely dominate this loop. */
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stmia r0!, {r3-r8,ip,lr}
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stmia r0!, {r3-r8,ip,lr}
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stmia r0!, {r3-r8,ip,lr}
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stmia r0!, {r3-r8,ip,lr}
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stmia r0!, {r3-r8,ip,lr}
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stmia r0!, {r3-r8,ip,lr}
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stmia r0!, {r3-r8,ip,lr}
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stmia r0!, {r3-r8,ip,lr}
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stmia r0!, {r3-r8,ip,lr}
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stmia r0!, {r3-r8,ip,lr}
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stmia r0!, {r3-r8,ip,lr}
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stmia r0!, {r3-r8,ip,lr}
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#endif
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subs r2, r2, #1
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bne 1b
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ldmfd sp!, {r4-r8, pc}
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#else /* __XSCALE__ */
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/*
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* XSCALE version of bcopy_page
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*/
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ENTRY(bcopy_page)
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pld [r0]
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stmfd sp!, {r4, r5}
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mov ip, #32
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ldr r2, [r0], #0x04 /* 0x00 */
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ldr r3, [r0], #0x04 /* 0x04 */
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1: pld [r0, #0x18] /* Prefetch 0x20 */
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ldr r4, [r0], #0x04 /* 0x08 */
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ldr r5, [r0], #0x04 /* 0x0c */
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strd r2, [r1], #0x08
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ldr r2, [r0], #0x04 /* 0x10 */
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ldr r3, [r0], #0x04 /* 0x14 */
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strd r4, [r1], #0x08
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ldr r4, [r0], #0x04 /* 0x18 */
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ldr r5, [r0], #0x04 /* 0x1c */
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strd r2, [r1], #0x08
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ldr r2, [r0], #0x04 /* 0x20 */
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ldr r3, [r0], #0x04 /* 0x24 */
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pld [r0, #0x18] /* Prefetch 0x40 */
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strd r4, [r1], #0x08
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ldr r4, [r0], #0x04 /* 0x28 */
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ldr r5, [r0], #0x04 /* 0x2c */
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strd r2, [r1], #0x08
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ldr r2, [r0], #0x04 /* 0x30 */
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ldr r3, [r0], #0x04 /* 0x34 */
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strd r4, [r1], #0x08
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ldr r4, [r0], #0x04 /* 0x38 */
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ldr r5, [r0], #0x04 /* 0x3c */
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strd r2, [r1], #0x08
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ldr r2, [r0], #0x04 /* 0x40 */
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ldr r3, [r0], #0x04 /* 0x44 */
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pld [r0, #0x18] /* Prefetch 0x60 */
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strd r4, [r1], #0x08
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ldr r4, [r0], #0x04 /* 0x48 */
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ldr r5, [r0], #0x04 /* 0x4c */
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strd r2, [r1], #0x08
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ldr r2, [r0], #0x04 /* 0x50 */
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ldr r3, [r0], #0x04 /* 0x54 */
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strd r4, [r1], #0x08
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ldr r4, [r0], #0x04 /* 0x58 */
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ldr r5, [r0], #0x04 /* 0x5c */
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strd r2, [r1], #0x08
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ldr r2, [r0], #0x04 /* 0x60 */
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ldr r3, [r0], #0x04 /* 0x64 */
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pld [r0, #0x18] /* Prefetch 0x80 */
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strd r4, [r1], #0x08
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ldr r4, [r0], #0x04 /* 0x68 */
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ldr r5, [r0], #0x04 /* 0x6c */
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strd r2, [r1], #0x08
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ldr r2, [r0], #0x04 /* 0x70 */
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ldr r3, [r0], #0x04 /* 0x74 */
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strd r4, [r1], #0x08
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ldr r4, [r0], #0x04 /* 0x78 */
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ldr r5, [r0], #0x04 /* 0x7c */
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strd r2, [r1], #0x08
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subs ip, ip, #0x01
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ldrgt r2, [r0], #0x04 /* 0x80 */
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ldrgt r3, [r0], #0x04 /* 0x84 */
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strd r4, [r1], #0x08
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bgt 1b
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ldmfd sp!, {r4, r5}
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mov pc, lr
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/*
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* XSCALE version of bzero_page
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*/
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ENTRY(bzero_page)
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mov r1, #PAGE_SIZE
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mov r2, #0
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mov r3, #0
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1: strd r2, [r0], #8 /* 32 */
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strd r2, [r0], #8
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strd r2, [r0], #8
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strd r2, [r0], #8
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strd r2, [r0], #8 /* 64 */
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strd r2, [r0], #8
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strd r2, [r0], #8
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strd r2, [r0], #8
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strd r2, [r0], #8 /* 96 */
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strd r2, [r0], #8
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strd r2, [r0], #8
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strd r2, [r0], #8
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strd r2, [r0], #8 /* 128 */
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strd r2, [r0], #8
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strd r2, [r0], #8
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strd r2, [r0], #8
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subs r1, r1, #128
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bne 1b
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mov pc, lr
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#endif /* __XSCALE__ */
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