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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39#include <machine/asm.h> 40 41/* 42 * Routines to copy to/from absolute virtual addresses. 43 * Needed because the boot code runs with %ds having a 64k offset 44 * whereas Unix runs with a zero offset. 45 * 46 * These routines are optimised for code space, not execution speed. 47 */ 48 49/* 50 * pbzero(void *dst, int cnt) 51 * zero absolute virtual memory 52 */ 53ENTRY(pbzero) 54 .code32 55 push %edi 56 push %es 57 mov 12(%esp),%edi 58 mov 16(%esp),%ecx 59 60 mov $flatdataseg, %ax /* selector with offset == 0 */ 61 mov %ax, %es 62 xor %eax,%eax 63 64 cld 65 rep 66 stosb 67 68 pop %es 69 pop %edi 70 ret 71 72/* 73 * vpbcopy(const void *src, void *dst, int cnt) 74 * Copy to absolute virtual address 75 */ 76ENTRY(vpbcopy) 77 .code32 78 push %esi 79 push %edi 80 push %es 81 mov 16(%esp),%esi 82 mov 20(%esp),%edi 83 mov 24(%esp),%ecx 84 85 mov $flatdataseg, %ax /* selector with offset == 0 */ 86 mov %ax, %es 87 xor %eax,%eax 88 89 cld 90 rep 91 movsb 92 93 popl %es 94 popl %edi 95 popl %esi 96 ret 97 98/* 99 * pvbcopy(const void *src, void *dst, int cnt) 100 * Copy from absolute virtual address 101 */ 102ENTRY(pvbcopy) 103 .code32 104 push %esi 105 push %edi 106 push %ds 107 mov 16(%esp),%esi 108 mov 20(%esp),%edi 109 mov 24(%esp),%ecx 110 111 mov $flatdataseg, %ax /* selector with offset == 0 */ 112 mov %ax, %ds 113 xor %eax,%eax 114 115 cld 116 rep 117 movsb 118 119 popl %ds 120 popl %edi 121 popl %esi 122 ret 123