83 строки
1.2 KiB
ArmAsm
83 строки
1.2 KiB
ArmAsm
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/*
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* linux/arch/m32r/mm/page.S
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*
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* Clear/Copy page with CPU
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*
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* Copyright (C) 2004 The Free Software Initiative of Japan
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*
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* Written by Niibe Yutaka
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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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*/
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.text
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.global copy_page
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/*
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* copy_page (to, from)
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*
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* PAGE_SIZE = 4096-byte
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* Cache line = 16-byte
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* 16 * 256
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*/
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.align 4
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copy_page:
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ldi r2, #255
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ld r3, @r0 /* cache line allocate */
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ld r4, @r1+
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ld r5, @r1+
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ld r6, @r1+
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ld r7, @r1+
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.fillinsn
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0:
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st r4, @r0
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st r5, @+r0
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st r6, @+r0
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st r7, @+r0
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ld r4, @r1+
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addi r0, #4
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ld r5, @r1+
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ld r6, @r1+
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ld r7, @r1+
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ld r3, @r0 /* cache line allocate */
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addi r2, #-1
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bnez r2, 0b
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st r4, @r0
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st r5, @+r0
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st r6, @+r0
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st r7, @+r0
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jmp r14
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.text
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.global clear_page
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/*
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* clear_page (to)
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*
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* PAGE_SIZE = 4096-byte
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* Cache line = 16-byte
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* 16 * 256
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*/
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.align 4
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clear_page:
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ldi r2, #255
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ldi r4, #0
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ld r3, @r0 /* cache line allocate */
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.fillinsn
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0:
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st r4, @r0
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st r4, @+r0
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st r4, @+r0
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st r4, @+r0
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addi r0, #4
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ld r3, @r0 /* cache line allocate */
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addi r2, #-1
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bnez r2, 0b
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st r4, @r0
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st r4, @+r0
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st r4, @+r0
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st r4, @+r0
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jmp r14
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