/*
Copyright (C) 1996-1997 Id Software, Inc.

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.

*/
#include <dpmi.h>

//#include "types.h"
typedef unsigned char BYTE;
typedef unsigned short WORD;
typedef unsigned long DWORD;

//#include "mgenord.h"
#define MGENVXD_REGISTER_ORD       1
#define MGENVXD_GETMEM_ORD         2
#define MGENVXD_DEREGISTER_ORD     3
#define MGENVXD_WAKEUP_ORD         4
#define MGENVXD_MAKEDQS_ORD        5


// Virtual 8086 API Ordinals
#define V86API_GETSELECTOR16_ORD (1)
#define V86API_GETSELECTOR32_ORD (2)
#define V86API_GETFLAT32_ORD (3)
#define V86API_MOVERP_ORD (6)
#define V86API_MOVEPR_ORD (7)
#define V86API_POST_ORD   (8)
#define V86API_INIT_ORD    (9)
#define V86API_UNINIT_ORD  (10)
#define V86API_INSERTKEY_ORD (11)
#define V86API_REMOVEHOTKEY_ORD  (12)
#define V86API_INSTALLHOTKEY_ORD (13)
#define V86API_HOOKINT48_ORD  (14)
#define V86API_WAKEUPDLL_ORD (15)

#define DPMIAPI_GETFLAT32_ORD (1)
#define DPMIAPI_POST_WINDOWS_ORD (2)
// these are DPMI functions.  Make sure they don't clash with the
// other MGENVXD_XXXX functions above, or the DPMI functions!
#define MGENVXD_GETQUEUECTR_ORD    6
#define MGENVXD_MOVENODE_ORD       7
#define MGENVXD_GETNODE_ORD        8
#define MGENVXD_FLUSHNODE_ORD      9
#define MGENVXD_MCOUNT_ORD         10
#define MGENVXD_MASTERNODE_ORD     11
#define MGENVXD_SANITYCHECK_ORD    12
#define MGENVXD_WAKEUPDLL_ORD       13
#define MGENVXD_WAIT_ORD           14

//
#define HWND_OFFSET (0)
#define UMSG_OFFSET (1)
#define SIZEREQUEST_OFFSET (2)
#define HVXD_OFFSET (3)
#define DATUM_OFFSET (4)
#define SLOT_OFFSET (5)
#define SIZEGIVEN_OFFSET (6)
#define SELECTOR32_OFFSET (7)
#define SELECTOR16_OFFSET (8)

//#include "magic.h"
#define MGENVXD_DEVICE_ID 0x18AA

//#include "rtq.h"
#define RTQ_NODE struct rtq_node

RTQ_NODE
   {
      RTQ_NODE *self; // Ring zero address of this node
      RTQ_NODE *left; // Ring zero address of preceding node
      RTQ_NODE *right; // Ring zero address of succeding node
      BYTE *      rtqDatum;  // Ring 3 Datum of Buffer (start of preface)
      BYTE *      rtqInsert; // Ring 3 insertion position
      WORD     rtqLen; // Length of buffer, excluding preface
      WORD     rtqUpCtr;  // Up Counter of bytes used so far
      WORD     rtqQCtr;   // number of nodes attached
      WORD     padding;   // DWORD alignment
   };

#define RTQ_PARAM_MOVENODE struct rtq_param_movenode
RTQ_PARAM_MOVENODE
   {
      WORD     rtqFromDQ;
      WORD     rtqToDQ;
   };

RTQ_NODE* rtq_fetch(RTQ_NODE*, RTQ_NODE*); // To, From

int _int86(int vector, __dpmi_regs *iregs, __dpmi_regs *oregs);

#define CHUNNEL_INT 0x48

#define int386		_int86
#define REGISTERS	__dpmi_regs

void
Yield(void)
{
	__dpmi_yield();
}

void
PostWindowsMessage(void)
{
   REGISTERS regs;

   regs.d.eax = DPMIAPI_POST_WINDOWS_ORD << 16 | MGENVXD_DEVICE_ID;
   regs.d.ebx = 0;
   regs.d.ecx = 0;
   int386(CHUNNEL_INT, &regs, &regs);
}

int
MGenWait(void)
{
   REGISTERS regs;

   regs.d.eax = MGENVXD_WAIT_ORD << 16 | MGENVXD_DEVICE_ID;
   int386(CHUNNEL_INT, &regs, &regs);
   return regs.d.eax;
}

int MGenGetQueueCtr(int qNo)
{
   REGISTERS   regs;

   regs.d.eax = MGENVXD_GETQUEUECTR_ORD << 16 | MGENVXD_DEVICE_ID;
   regs.d.ebx = qNo;
   int386(CHUNNEL_INT, &regs, &regs);

   return regs.d.eax;
}

RTQ_NODE *MGenMoveTo(int qFrom, int qTo)
{
   REGISTERS   regs;

   regs.d.eax = MGENVXD_MOVENODE_ORD << 16 | MGENVXD_DEVICE_ID;
   regs.d.ebx = qFrom;
   regs.d.ecx = qTo;
   int386(CHUNNEL_INT, &regs, &regs);

   return (RTQ_NODE *) regs.d.eax;
}

RTQ_NODE *MGenGetNode(int q)
{
   REGISTERS   regs;

   regs.d.eax = MGENVXD_GETNODE_ORD << 16 | MGENVXD_DEVICE_ID;
   regs.d.ebx = q;
   int386(CHUNNEL_INT, &regs, &regs);

   return (RTQ_NODE *) regs.d.eax;
}

RTQ_NODE *MGenGetMasterNode(unsigned *size)
{
   REGISTERS   regs;

   regs.d.eax = MGENVXD_MASTERNODE_ORD << 16 | MGENVXD_DEVICE_ID;
   int386(CHUNNEL_INT, &regs, &regs);
   *size = regs.d.ecx;

   return (RTQ_NODE *) regs.d.eax;
}

RTQ_NODE *MGenFlushNodes(int qFrom, int qTo)
{
   REGISTERS   regs;

   regs.d.eax = MGENVXD_FLUSHNODE_ORD << 16 | MGENVXD_DEVICE_ID;
   regs.d.ebx = qFrom;
   regs.d.ecx = qTo;
   int386(CHUNNEL_INT, &regs, &regs);

   return (RTQ_NODE *) regs.d.eax;
}

int MGenMCount(unsigned lowerOrderBits, unsigned upperOrderBits)
{
   REGISTERS   regs;

   regs.d.eax = MGENVXD_MCOUNT_ORD << 16 | MGENVXD_DEVICE_ID;
   regs.d.ebx = lowerOrderBits;
   regs.d.ecx = upperOrderBits;
   int386(CHUNNEL_INT, &regs, &regs);

   return regs.d.eax;
}

int MGenSanityCheck(void)
{
   REGISTERS   regs;

   regs.d.eax = MGENVXD_SANITYCHECK_ORD << 16 | MGENVXD_DEVICE_ID;
   int386(CHUNNEL_INT, &regs, &regs);

   return regs.d.eax;
}

void MGenWakeupDll(void)
{
   REGISTERS   regs;

   regs.d.eax = MGENVXD_WAKEUPDLL_ORD << 16 | MGENVXD_DEVICE_ID;
   int386(CHUNNEL_INT, &regs, &regs);
}