pvcopy.S revision 1.2
1 1.2 martin /* $NetBSD: pvcopy.S,v 1.2 2008/04/28 20:23:25 martin Exp $ */ 2 1.1 dsl 3 1.1 dsl /*- 4 1.1 dsl * Copyright (c) 2003 The NetBSD Foundation, Inc. 5 1.1 dsl * All rights reserved. 6 1.1 dsl * 7 1.1 dsl * This code is derived from software contributed to The NetBSD Foundation 8 1.1 dsl * by David Laight. 9 1.1 dsl * 10 1.1 dsl * Redistribution and use in source and binary forms, with or without 11 1.1 dsl * modification, are permitted provided that the following conditions 12 1.1 dsl * are met: 13 1.1 dsl * 1. Redistributions of source code must retain the above copyright 14 1.1 dsl * notice, this list of conditions and the following disclaimer. 15 1.1 dsl * 2. Redistributions in binary form must reproduce the above copyright 16 1.1 dsl * notice, this list of conditions and the following disclaimer in the 17 1.1 dsl * documentation and/or other materials provided with the distribution. 18 1.1 dsl * 19 1.1 dsl * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 1.1 dsl * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 1.1 dsl * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 1.1 dsl * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 1.1 dsl * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 1.1 dsl * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 1.1 dsl * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 1.1 dsl * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 1.1 dsl * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 1.1 dsl * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 1.1 dsl * POSSIBILITY OF SUCH DAMAGE. 30 1.1 dsl */ 31 1.1 dsl 32 1.1 dsl #include <machine/asm.h> 33 1.1 dsl 34 1.1 dsl /* 35 1.1 dsl * Routines to copy to/from absolute virtual addresses. 36 1.1 dsl * Needed because the boot code runs with %ds having a 64k offset 37 1.1 dsl * whereas Unix runs with a zero offset. 38 1.1 dsl * 39 1.1 dsl * These routines are optimised for code space, not execution speed. 40 1.1 dsl */ 41 1.1 dsl 42 1.1 dsl /* 43 1.1 dsl * pbzero(void *dst, int cnt) 44 1.1 dsl * zero absolute virtual memory 45 1.1 dsl */ 46 1.1 dsl ENTRY(pbzero) 47 1.1 dsl .code32 48 1.1 dsl push %edi 49 1.1 dsl push %es 50 1.1 dsl mov 12(%esp),%edi 51 1.1 dsl mov 16(%esp),%ecx 52 1.1 dsl 53 1.1 dsl mov $flatdataseg, %ax /* selector with offset == 0 */ 54 1.1 dsl mov %ax, %es 55 1.1 dsl xor %eax,%eax 56 1.1 dsl 57 1.1 dsl cld 58 1.1 dsl rep 59 1.1 dsl stosb 60 1.1 dsl 61 1.1 dsl pop %es 62 1.1 dsl pop %edi 63 1.1 dsl ret 64 1.1 dsl 65 1.1 dsl /* 66 1.1 dsl * vpbcopy(const void *src, void *dst, int cnt) 67 1.1 dsl * Copy to absolute virtual address 68 1.1 dsl */ 69 1.1 dsl ENTRY(vpbcopy) 70 1.1 dsl .code32 71 1.1 dsl push %esi 72 1.1 dsl push %edi 73 1.1 dsl push %es 74 1.1 dsl mov 16(%esp),%esi 75 1.1 dsl mov 20(%esp),%edi 76 1.1 dsl mov 24(%esp),%ecx 77 1.1 dsl 78 1.1 dsl mov $flatdataseg, %ax /* selector with offset == 0 */ 79 1.1 dsl mov %ax, %es 80 1.1 dsl xor %eax,%eax 81 1.1 dsl 82 1.1 dsl cld 83 1.1 dsl rep 84 1.1 dsl movsb 85 1.1 dsl 86 1.1 dsl popl %es 87 1.1 dsl popl %edi 88 1.1 dsl popl %esi 89 1.1 dsl ret 90 1.1 dsl 91 1.1 dsl /* 92 1.1 dsl * pvbcopy(const void *src, void *dst, int cnt) 93 1.1 dsl * Copy from absolute virtual address 94 1.1 dsl */ 95 1.1 dsl ENTRY(pvbcopy) 96 1.1 dsl .code32 97 1.1 dsl push %esi 98 1.1 dsl push %edi 99 1.1 dsl push %ds 100 1.1 dsl mov 16(%esp),%esi 101 1.1 dsl mov 20(%esp),%edi 102 1.1 dsl mov 24(%esp),%ecx 103 1.1 dsl 104 1.1 dsl mov $flatdataseg, %ax /* selector with offset == 0 */ 105 1.1 dsl mov %ax, %ds 106 1.1 dsl xor %eax,%eax 107 1.1 dsl 108 1.1 dsl cld 109 1.1 dsl rep 110 1.1 dsl movsb 111 1.1 dsl 112 1.1 dsl popl %ds 113 1.1 dsl popl %edi 114 1.1 dsl popl %esi 115 1.1 dsl ret 116
Indexes created Mon Sep 29 21:09:56 GMT 2025