add PCI framework

Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@3723

include/pci_bus.h

@@ -0,0 +1,85 @@
+/*
+ *  Copyright (C) 2002-2011  The DOSBox Team
+ *
+ *  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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#ifndef DOSBOX_PCI_H
+#define DOSBOX_PCI_H
+
+//#define PCI_FUNCTIONALITY_ENABLED 0
+
+#if defined PCI_FUNCTIONALITY_ENABLED
+
+#define PCI_MAX_PCIDEVICES		10
+#define PCI_MAX_PCIFUNCTIONS	8
+
+
+class PCI_Device {
+private:
+	Bits pci_id, pci_subfunction;
+	Bit16u vendor_id, device_id;
+
+	// subdevices declarations, they will respond to pci functions 1 to 7
+	// (main device is attached to function 0)
+	Bitu num_subdevices;
+	PCI_Device* subdevices[PCI_MAX_PCIFUNCTIONS-1];
+
+public:
+	PCI_Device(Bit16u vendor, Bit16u device);
+
+	Bits PCIId(void) {
+		return pci_id;
+	}
+	Bits PCISubfunction(void) {
+		return pci_subfunction;
+	}
+	Bit16u VendorID(void) {
+		return vendor_id;
+	}
+	Bit16u DeviceID(void) {
+		return device_id;
+	}
+
+	void SetPCIId(Bitu number, Bits subfct);
+
+	bool AddSubdevice(PCI_Device* dev);
+	void RemoveSubdevice(Bits subfct);
+
+	PCI_Device* GetSubdevice(Bits subfct);
+
+	Bit16u NumSubdevices(void) {
+		if (num_subdevices>PCI_MAX_PCIFUNCTIONS-1) return PCI_MAX_PCIFUNCTIONS-1;
+		return num_subdevices;
+	}
+
+	Bits GetNextSubdeviceNumber(void) {
+		if (num_subdevices>=PCI_MAX_PCIFUNCTIONS-1) return -1;
+		return num_subdevices+1;
+	}
+
+	virtual Bits ParseReadRegister(Bit8u regnum)=0;
+	virtual Bits ParseWriteRegister(Bit8u regnum,Bit8u value)=0;
+	virtual bool InitializeRegisters(Bit8u registers[256])=0;
+
+};
+
+bool PCI_IsInitialized();
+
+RealPt PCI_GetPModeInterface(void);
+
+#endif
+
+#endif