116 lines
2.7 KiB
ArmAsm
116 lines
2.7 KiB
ArmAsm
/* $NetBSD: pvcopy.S,v 1.2 2008/04/28 20:23:25 martin Exp $ */
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/*-
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* Copyright (c) 2003 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by David Laight.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <machine/asm.h>
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/*
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* Routines to copy to/from absolute virtual addresses.
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* Needed because the boot code runs with %ds having a 64k offset
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* whereas Unix runs with a zero offset.
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*
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* These routines are optimised for code space, not execution speed.
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*/
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/*
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* pbzero(void *dst, int cnt)
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* zero absolute virtual memory
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*/
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ENTRY(pbzero)
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.code32
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push %edi
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push %es
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mov 12(%esp),%edi
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mov 16(%esp),%ecx
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mov $flatdataseg, %ax /* selector with offset == 0 */
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mov %ax, %es
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xor %eax,%eax
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cld
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rep
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stosb
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pop %es
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pop %edi
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ret
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/*
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* vpbcopy(const void *src, void *dst, int cnt)
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* Copy to absolute virtual address
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*/
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ENTRY(vpbcopy)
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.code32
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push %esi
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push %edi
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push %es
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mov 16(%esp),%esi
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mov 20(%esp),%edi
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mov 24(%esp),%ecx
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mov $flatdataseg, %ax /* selector with offset == 0 */
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mov %ax, %es
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xor %eax,%eax
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cld
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rep
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movsb
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popl %es
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popl %edi
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popl %esi
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ret
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/*
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* pvbcopy(const void *src, void *dst, int cnt)
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* Copy from absolute virtual address
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*/
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ENTRY(pvbcopy)
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.code32
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push %esi
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push %edi
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push %ds
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mov 16(%esp),%esi
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mov 20(%esp),%edi
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mov 24(%esp),%ecx
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mov $flatdataseg, %ax /* selector with offset == 0 */
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mov %ax, %ds
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xor %eax,%eax
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cld
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rep
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movsb
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popl %ds
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popl %edi
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popl %esi
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ret
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