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/*
* VBMouse - PCI BIOS communication routines
* Copyright (C) 2022 Javier S. Pedro
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#ifndef PCI_H
#define PCI_H
typedef unsigned char pcierr;
enum {
PCI_SUCCESSFUL = 0,
PCI_GENERIC_ERROR = 1,
PCI_FUNC_NOT_SUPPORTED = 0x81,
PCI_BAD_VENDOR_ID = 0x83,
PCI_DEVICE_NOT_FOUND = 0x86,
PCI_BAD_REGISTER_NUMBER = 0x87,
PCI_SET_FAILED = 0x88,
PCI_BUFFER_TOO_SMALL = 0x89
};
typedef unsigned short pcisel;
static pcierr pci_init_bios(void);
#pragma aux pci_init_bios = \
"mov ax, 0xB101" \
"int 0x1A" \
"jc not_found" \
"cmp ah, 0" \
"jne not_found" \
"cmp edx, ' ICP'" \
"jne not_found" \
"mov ah, 0" \
"jmp end" \
"not_found: mov ah, 1" \
"end:" \
__value [ah] \
__modify [ax bx cx dx]
static pcierr pci_find_device(pcisel *sel, unsigned short vendor_id, unsigned short dev_id, unsigned short index);
#pragma aux pci_find_device = \
"mov ax, 0xB102" \
"int 0x1A" \
"jnc success" \
"mov ah, 1" \
"success: mov [es:di], bx" \
__parm [es di] [dx] [cx] [si] \
__value [ah] \
__modify [ax bx]
/* Reading from configuration space */
static pcierr pci_read_config_byte(pcisel sel, unsigned char reg, unsigned char *data);
#pragma aux pci_read_config_byte = \
"mov ax, 0xB108" \
"int 0x1A" \
"mov [es:si], cl" \
__parm [bx] [di] [es si] \
__value [ah] \
__modify [ax cx]
static pcierr pci_read_config_word(pcisel sel, unsigned char reg, unsigned short *data);
#pragma aux pci_read_config_word = \
"mov ax, 0xB109" \
"int 0x1A" \
"mov [es:si], cx" \
__parm [bx] [di] [es si] \
__value [ah] \
__modify [ax cx]
static pcierr pci_read_config_dword(pcisel sel, unsigned char reg, unsigned long *data);
#pragma aux pci_read_config_dword = \
"mov ax, 0xB10A" \
"int 0x1A" \
"mov [es:si], ecx" \
__parm [bx] [di] [es si] \
__value [ah] \
__modify [ax cx]
/* Writing to configuration space */
static pcierr pci_write_config_byte(pcisel sel, unsigned char reg, unsigned char data);
#pragma aux pci_write_config_byte = \
"mov ax, 0xB10B" \
"int 0x1A" \
__parm [bx] [di] [cl] \
__value [ah] \
__modify [ax]
static pcierr pci_write_config_word(pcisel sel, unsigned char reg, unsigned short data);
#pragma aux pci_write_config_word = \
"mov ax, 0xB10C" \
"int 0x1A" \
__parm [bx] [di] [cx] \
__value [ah] \
__modify [ax cx]
static pcierr pci_write_config_dword(pcisel sel, unsigned char reg, unsigned long data);
#pragma aux pci_write_config_dword = \
"mov ax, 0xB10D" \
"shl esi, 16" \
"and ecx, 0xFFFF" \
"or ecx, esi" \
"int 0x1A" \
__parm [bx] [di] [si cx] \
__value [ah] \
__modify [ax cx]
#endif
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