pnpbioscall.S revision 1.1.2.2
1 1.1.2.2 thorpej /* $NetBSD: pnpbioscall.S,v 1.1.2.2 2002/12/11 06:01:04 thorpej Exp $ */ 2 1.1.2.2 thorpej /* 3 1.1.2.2 thorpej * Copyright (c) 1999 4 1.1.2.2 thorpej * Matthias Drochner. All rights reserved. 5 1.1.2.2 thorpej * 6 1.1.2.2 thorpej * Redistribution and use in source and binary forms, with or without 7 1.1.2.2 thorpej * modification, are permitted provided that the following conditions 8 1.1.2.2 thorpej * are met: 9 1.1.2.2 thorpej * 1. Redistributions of source code must retain the above copyright 10 1.1.2.2 thorpej * notice, this list of conditions, and the following disclaimer. 11 1.1.2.2 thorpej * 2. Redistributions in binary form must reproduce the above copyright 12 1.1.2.2 thorpej * notice, this list of conditions and the following disclaimer in the 13 1.1.2.2 thorpej * documentation and/or other materials provided with the distribution. 14 1.1.2.2 thorpej * 15 1.1.2.2 thorpej * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 1.1.2.2 thorpej * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 1.1.2.2 thorpej * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 1.1.2.2 thorpej * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 1.1.2.2 thorpej * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 1.1.2.2 thorpej * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 1.1.2.2 thorpej * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 1.1.2.2 thorpej * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 1.1.2.2 thorpej * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 1.1.2.2 thorpej * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 1.1.2.2 thorpej * SUCH DAMAGE. 26 1.1.2.2 thorpej */ 27 1.1.2.2 thorpej 28 1.1.2.2 thorpej #include "assym.h" 29 1.1.2.2 thorpej #include <machine/asm.h> 30 1.1.2.2 thorpej #include <machine/segments.h> 31 1.1.2.2 thorpej 32 1.1.2.2 thorpej .data 33 1.1.2.2 thorpej saveesp: 34 1.1.2.2 thorpej .space 4 35 1.1.2.2 thorpej 36 1.1.2.2 thorpej NENTRY(pnpbioscall) 37 1.1.2.2 thorpej pushl %ebp 38 1.1.2.2 thorpej movl %esp, %ebp 39 1.1.2.2 thorpej /* 40 1.1.2.2 thorpej * disable interrupts - our handlers can't deal with frames of the 41 1.1.2.2 thorpej * segment we are calling, and the BIOS can't use our IDT anyway 42 1.1.2.2 thorpej */ 43 1.1.2.2 thorpej pushfl 44 1.1.2.2 thorpej cli 45 1.1.2.2 thorpej 46 1.1.2.2 thorpej /* call pnpbiostramp() */ 47 1.1.2.2 thorpej lcall $GSEL(GPNPBIOSTRAMP_SEL, SEL_KPL), $0 48 1.1.2.2 thorpej 49 1.1.2.2 thorpej popfl 50 1.1.2.2 thorpej popl %ebp 51 1.1.2.2 thorpej ret 52 1.1.2.2 thorpej 53 1.1.2.2 thorpej NENTRY(pnpbiostramp) 54 1.1.2.2 thorpej pushl %ebx 55 1.1.2.2 thorpej 56 1.1.2.2 thorpej /* save current stack pointer */ 57 1.1.2.2 thorpej movl %esp, %eax 58 1.1.2.2 thorpej movl %eax, saveesp 59 1.1.2.2 thorpej 60 1.1.2.2 thorpej /* switch to new stack */ 61 1.1.2.2 thorpej movl 8(%ebp), %esp /* call argument */ 62 1.1.2.2 thorpej movl $GSEL(GPNPBIOSSCRATCH_SEL, SEL_KPL), %eax 63 1.1.2.2 thorpej mov %ax, %ss 64 1.1.2.2 thorpej 65 1.1.2.2 thorpej /* fake the call return address (16-bit frame) */ 66 1.1.2.2 thorpej mov %cs, %ax 67 1.1.2.2 thorpej push %ax 68 1.1.2.2 thorpej movl $(1f - _C_LABEL(pnpbiostramp)), %eax 69 1.1.2.2 thorpej push %ax 70 1.1.2.2 thorpej 71 1.1.2.2 thorpej /* do a long jump */ 72 1.1.2.2 thorpej pushl $GSEL(GPNPBIOSCODE_SEL, SEL_KPL) 73 1.1.2.2 thorpej pushl (_C_LABEL(pnpbios_entry)) 74 1.1.2.2 thorpej #if 1 75 1.1.2.2 thorpej /* paranoia: don't pass our ds */ 76 1.1.2.2 thorpej movl $GSEL(GPNPBIOSSCRATCH_SEL, SEL_KPL), %eax 77 1.1.2.2 thorpej mov %ax, %ds 78 1.1.2.2 thorpej #endif 79 1.1.2.2 thorpej lret 80 1.1.2.2 thorpej 81 1.1.2.2 thorpej 1: /* returned from BIOS call */ 82 1.1.2.2 thorpej movl $GSEL(GDATA_SEL, SEL_KPL), %ebx 83 1.1.2.2 thorpej #if 1 84 1.1.2.2 thorpej mov %bx, %ds 85 1.1.2.2 thorpej #endif 86 1.1.2.2 thorpej /* back to old stack */ 87 1.1.2.2 thorpej mov %bx, %ss 88 1.1.2.2 thorpej movl saveesp, %ebx 89 1.1.2.2 thorpej movl %ebx, %esp 90 1.1.2.2 thorpej 91 1.1.2.2 thorpej popl %ebx 92 1.1.2.2 thorpej lret 93 1.1.2.2 thorpej .globl _C_LABEL(epnpbiostramp) 94 1.1.2.2 thorpej _C_LABEL(epnpbiostramp): 95
Indexes created Mon Oct 27 15:09:58 GMT 2025