minix/sys/arch/i386/stand/lib/bios_pci.S

215 lines
4.4 KiB
ArmAsm
Raw Normal View History

/* $NetBSD: bios_pci.S,v 1.6 2005/12/11 12:17:48 christos Exp $ */
/*
* Copyright (c) 1996
* Matthias Drochner. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
/* minimal calls to PCI BIOS */
#include <machine/asm.h>
#define addr32 .byte 0x67
#define data32 .byte 0x66
#define PCI_FUNCTION_ID 0xb1
#define PCI_BIOS_PRESENT 0x01
#define FIND_PCI_DEVICE 0x02
#define READ_CONFIG_DWORD 0x0a
#define WRITE_CONFIG_DWORD 0x0d
/* int pcibios_present(int *signature)
return: AX from BIOS call, -1 on error
var param: EDX from BIOS call, must be signature "PCI "
*/
ENTRY(pcibios_present)
pushl %ebp
movl %esp, %ebp
pushl %ebx
pushl %ecx
pushl %edx
call _C_LABEL(prot_to_real) # enter real mode
.code16
movb $PCI_FUNCTION_ID, %ah
movb $PCI_BIOS_PRESENT, %al
int $0x1a
jnc ok1
movl $-1, %ebx
jmp err1
ok1:
xorl %ebx, %ebx
mov %ax, %bx
err1:
calll _C_LABEL(real_to_prot) # back to protected mode
.code32
movl 8(%ebp), %eax
movl %edx, (%eax)
movl %ebx, %eax # return value in %eax
popl %edx
popl %ecx
popl %ebx
popl %ebp
ret
/* int pcibios_finddev(int vendor, int device, int index, int *busdevfcn)
return: AH from BIOS call, -1 on error
var param: BX from BIOS call, contains bus/device/function
*/
ENTRY(pcibios_finddev)
pushl %ebp
movl %esp, %ebp
pushl %ebx
pushl %ecx
pushl %edx
pushl %esi
movl 8(%ebp), %edx
movl 12(%ebp), %ecx
movl 16(%ebp), %esi
call _C_LABEL(prot_to_real) # enter real mode
.code16
movb $PCI_FUNCTION_ID, %ah
movb $FIND_PCI_DEVICE, %al
int $0x1a
jnc ok2
movl $-1, %edx
jmp err2
ok2:
movl $0,%edx
movb %ah, %dl
err2:
calll _C_LABEL(real_to_prot) # back to protected mode
.code32
movl 20(%ebp), %eax
mov %bx, (%eax)
movl %edx, %eax # return value in %eax
popl %esi
popl %edx
popl %ecx
popl %ebx
popl %ebp
ret
/* int pcibios_cfgread(int busdevfcn, int offset, int *value)
return: AH from BIOS call, -1 on error
var param: ECX from BIOS call, contains value read
*/
ENTRY(pcibios_cfgread)
pushl %ebp
movl %esp, %ebp
pushl %ebx
pushl %ecx
pushl %edx
pushl %edi
movl 8(%ebp), %ebx
movl 12(%ebp), %edi
call _C_LABEL(prot_to_real) # enter real mode
.code16
movb $PCI_FUNCTION_ID, %ah
movb $READ_CONFIG_DWORD, %al
int $0x1a
jnc ok3
movl $-1, %edx
jmp err3
ok3:
movl $0,%edx
movb %ah, %dl
err3:
calll _C_LABEL(real_to_prot) # back to protected mode
.code32
movl 16(%ebp), %eax
movl %ecx, (%eax)
movl %edx, %eax # return value in %eax
popl %edi
popl %edx
popl %ecx
popl %ebx
popl %ebp
ret
/* int pcibios_cfgwrite(int busdevfcn, int offset, int value)
return: AH from BIOS call, -1 on error
var param: ECX from BIOS call, contains value read
*/
ENTRY(pcibios_cfgwrite)
pushl %ebp
movl %esp, %ebp
pushl %ebx
pushl %ecx
pushl %edx
pushl %edi
movl 8(%ebp), %ebx
movl 12(%ebp), %edi
movl 16(%ebp), %ecx
call _C_LABEL(prot_to_real) # enter real mode
.code16
movb $PCI_FUNCTION_ID, %ah
movb $WRITE_CONFIG_DWORD, %al
int $0x1a
jnc ok4
movl $-1, %edx
jmp err4
ok4:
movl $0,%edx
movb %ah, %dl
err4:
calll _C_LABEL(real_to_prot) # back to protected mode
.code32
movl %edx, %eax # return value in %eax
popl %edi
popl %edx
popl %ecx
popl %ebx
popl %ebp
ret