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      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 
     46 8:
     47 #include "i386/bioscall/biostramp.inc"
     48 9:
     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) */
     66 ENTRY(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