1/* $NetBSD: bioscall.S,v 1.11 2023/02/25 13:52:09 riastradh Exp $ */ 2 3/*- 4 * Copyright (c) 1997 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by John Kohl. 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__KERNEL_RCSID(0, "$NetBSD: bioscall.S,v 1.11 2023/02/25 13:52:09 riastradh Exp $"); 34 35#include <machine/bioscall.h> 36 37#include "assym.h" 38 39/* LINTSTUB: include <sys/types.h> */ 40/* LINTSTUB: include <machine/bioscall.h> */ 41 42 .section ".rodata" 43_C_LABEL(biostramp_image): 44 .globl _C_LABEL(biostramp_image) 45 468: 47#include "i386/bioscall/biostramp.inc" 489: 49 50 .globl _C_LABEL(biostramp_image_size) 51_C_LABEL(biostramp_image_size): 52 .long 9b - 8b 53 54 .text 55/* 56 * void bioscall(int function, struct bioscallregs *regs): 57 * call the BIOS interrupt "function" from real mode with 58 * registers as specified in "regs" 59 * for the flags, though, only these flags are passed to the BIOS-- 60 * the remainder come from the flags register at the time of the call: 61 * (PSL_C|PSL_PF|PSL_AF|PSL_Z|PSL_N|PSL_D|PSL_V) 62 * 63 * Fills in *regs with registers as returned by BIOS. 64 */ 65/* LINTSTUB: Func: void bioscall(int function, struct bioscallregs *regs) */ 66ENTRY(bioscall) 67 pushl %ebp 68 movl %esp,%ebp /* set up frame ptr */ 69 70 call _C_LABEL(kpreempt_disable) 71 72 /* install lwp0 pmap */ 73 movl _C_LABEL(kernel_pmap_ptr),%eax 74 pushl %eax 75 call _C_LABEL(cpu_load_pmap) 76 addl $4,%esp 77 78 movl $(BIOSTRAMP_BASE),%eax /* address of trampoline area */ 79 pushl 12(%ebp) 80 pushl 8(%ebp) 81 call *%eax /* machdep.c initializes it */ 82 addl $8,%esp /* clear args from stack */ 83 84 /* restore pmap - saved value is in curcpu()->ci_pmap */ 85 movl %fs:(CPU_INFO_PMAP),%eax 86 pushl %eax 87 call _C_LABEL(cpu_load_pmap) 88 addl $4,%esp 89 90 call _C_LABEL(kpreempt_enable) 91 92 leave 93 ret 94