mirror of
https://github.com/joncampbell123/dosbox-x.git
synced 2025-05-09 03:41:10 +08:00
106 lines
3.1 KiB
C++
106 lines
3.1 KiB
C++
/*
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* Copyright (C) 2002-2015 The DOSBox Team
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifndef DOSBOX_PCI_H
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#define DOSBOX_PCI_H
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#define PCI_MAX_PCIBUSSES 255
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#define PCI_MAX_PCIDEVICES 32
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#define PCI_MAX_PCIFUNCTIONS 8
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class PCI_Device {
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public:
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/* configuration space */
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unsigned char config[256];
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unsigned char config_writemask[256];
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PCI_Device(Bit16u vendor, Bit16u device);
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virtual ~PCI_Device();
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/* configuration space assistant functions */
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Bit16u getDeviceID() {
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return host_readw(config + 0x02);
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}
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void setDeviceID(const Bit16u device) {
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return host_writew(config + 0x02,device);
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}
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Bit16u getVendorID() {
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return host_readw(config + 0x00);
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}
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void setVendorID(const Bit16u vendor) {
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return host_writew(config + 0x00,vendor);
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}
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/* configuration space I/O */
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virtual void config_write(Bit8u regnum,Bitu iolen,Bit32u value) {
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if (iolen == 1) {
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const unsigned char mask = config_writemask[regnum];
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const unsigned char nmask = ~mask;
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/* only allow writing to the bits marked off as writeable */
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config[regnum] = (config[regnum] & nmask) + ((unsigned char)value & mask);
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}
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else if (iolen == 4 && (regnum&3) == 2) { /* unaligned DWORD write (subdividable into two WORD writes) */
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config_write(regnum,2,value&0xFFFF);
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config_write(regnum+2,2,value>>16);
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}
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else {
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/* subdivide into 8-bit I/O */
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/* NTS: If I recall, this virtual function call means that we'll call the
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* C++ subclass's config_write() NOT our own--right? */
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for (Bitu i=0;i < iolen;i++) {
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config_write(regnum+i,1,value&0xFF);
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value >>= 8U;
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}
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}
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}
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virtual Bit32u config_read(Bit8u regnum,Bitu iolen) {
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/* subdivide into 8-bit I/O */
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Bit32u v=0;
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if (iolen == 1)
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return config[regnum];
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else if (iolen == 4 && (regnum&3) == 2) { /* unaligned DWORD read (subdividable into two WORD reads) */
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v = config_read(regnum,2);
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v += config_read(regnum+2,2) << 16;
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}
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else {
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/* NTS: If I recall, this virtual function call means that we'll call the
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* C++ subclass's config_read() NOT our own--right? */
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for (Bitu i=0;i < iolen;i++)
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v += ((config_read(regnum+i,1)&0xFF) << ((iolen-i-1)*8));
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}
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return v;
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}
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};
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bool PCI_IsInitialized();
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void PCI_AddSVGAS3_Device(void);
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void PCI_RemoveSVGAS3_Device(void);
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void PCI_AddSST_Device(Bitu type);
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void PCI_RemoveSST_Device(void);
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RealPt PCI_GetPModeInterface(void);
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#endif
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