diff options
Diffstat (limited to 'pci.h')
| -rw-r--r-- | pci.h | 122 |
1 files changed, 122 insertions, 0 deletions
@@ -0,0 +1,122 @@ +/* + * 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 |