1/* $NetBSD: pvcopy.S,v 1.1 2003/04/16 13:24:10 dsl Exp $ */ 2 3/*- 4 * Copyright (c) 2003 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by David Laight. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32#include <machine/asm.h> 33 34/* 35 * Routines to copy to/from absolute virtual addresses. 36 * Needed because the boot code runs with %ds having a 64k offset 37 * whereas Unix runs with a zero offset. 38 * 39 * These routines are optimised for code space, not execution speed. 40 */ 41 42/* 43 * pbzero(void *dst, int cnt) 44 * zero absolute virtual memory 45 */ 46ENTRY(pbzero) 47 .code32 48 push %edi 49 push %es 50 mov 12(%esp),%edi 51 mov 16(%esp),%ecx 52 53 mov $flatdataseg, %ax /* selector with offset == 0 */ 54 mov %ax, %es 55 xor %eax,%eax 56 57 cld 58 rep 59 stosb 60 61 pop %es 62 pop %edi 63 ret 64 65/* 66 * vpbcopy(const void *src, void *dst, int cnt) 67 * Copy to absolute virtual address 68 */ 69ENTRY(vpbcopy) 70 .code32 71 push %esi 72 push %edi 73 push %es 74 mov 16(%esp),%esi 75 mov 20(%esp),%edi 76 mov 24(%esp),%ecx 77 78 mov $flatdataseg, %ax /* selector with offset == 0 */ 79 mov %ax, %es 80 xor %eax,%eax 81 82 cld 83 rep 84 movsb 85 86 popl %es 87 popl %edi 88 popl %esi 89 ret 90 91/* 92 * pvbcopy(const void *src, void *dst, int cnt) 93 * Copy from absolute virtual address 94 */ 95ENTRY(pvbcopy) 96 .code32 97 push %esi 98 push %edi 99 push %ds 100 mov 16(%esp),%esi 101 mov 20(%esp),%edi 102 mov 24(%esp),%ecx 103 104 mov $flatdataseg, %ax /* selector with offset == 0 */ 105 mov %ax, %ds 106 xor %eax,%eax 107 108 cld 109 rep 110 movsb 111 112 popl %ds 113 popl %edi 114 popl %esi 115 ret 116