/****************************************************************************
*
* SciTech OS Portability Manager Library
*
* ========================================================================
*
* The contents of this file are subject to the SciTech MGL Public
* License Version 1.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.scitechsoft.com/mgl-license.txt
*
* Software distributed under the License is distributed on an
* "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is Copyright (C) 1991-1998 SciTech Software, Inc.
*
* The Initial Developer of the Original Code is SciTech Software, Inc.
* All Rights Reserved.
*
* ========================================================================
*
* Language: ANSI C
* Environment: 32-bit SMX embedded systems development
*
* Description: Implementation for the OS Portability Manager Library, which
* contains functions to implement OS specific services in a
* generic, cross platform API. Porting the OS Portability
* Manager library is the first step to porting any SciTech
* products to a new platform.
*
****************************************************************************/
#include "pmapi.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <dos.h>
#include "smx/ps2mouse.h"
/*--------------------------- Global variables ----------------------------*/
static int globalDataStart;
PM_criticalHandler _VARAPI _PM_critHandler = NULL;
PM_breakHandler _VARAPI _PM_breakHandler = NULL;
PM_intHandler _VARAPI _PM_timerHandler = NULL;
PM_intHandler _VARAPI _PM_rtcHandler = NULL;
PM_intHandler _VARAPI _PM_keyHandler = NULL;
PM_key15Handler _VARAPI _PM_key15Handler = NULL;
PM_mouseHandler _VARAPI _PM_mouseHandler = NULL;
PM_intHandler _VARAPI _PM_int10Handler = NULL;
int _VARAPI _PM_mouseMask;
uchar * _VARAPI _PM_ctrlCPtr; /* Location of Ctrl-C flag */
uchar * _VARAPI _PM_ctrlBPtr; /* Location of Ctrl-Break flag */
uchar * _VARAPI _PM_critPtr; /* Location of Critical error Bf*/
PMFARPTR _VARAPI _PM_prevTimer = PMNULL; /* Previous timer handler */
PMFARPTR _VARAPI _PM_prevRTC = PMNULL; /* Previous RTC handler */
PMFARPTR _VARAPI _PM_prevKey = PMNULL; /* Previous key handler */
PMFARPTR _VARAPI _PM_prevKey15 = PMNULL; /* Previous key15 handler */
PMFARPTR _VARAPI _PM_prevBreak = PMNULL; /* Previous break handler */
PMFARPTR _VARAPI _PM_prevCtrlC = PMNULL; /* Previous CtrlC handler */
PMFARPTR _VARAPI _PM_prevCritical = PMNULL; /* Previous critical handler */
long _VARAPI _PM_prevRealTimer; /* Previous real mode timer */
long _VARAPI _PM_prevRealRTC; /* Previous real mode RTC */
long _VARAPI _PM_prevRealKey; /* Previous real mode key */
long _VARAPI _PM_prevRealKey15; /* Previous real mode key15 */
long _VARAPI _PM_prevRealInt10; /* Previous real mode int 10h */
static uchar _PM_oldCMOSRegA; /* CMOS register A contents */
static uchar _PM_oldCMOSRegB; /* CMOS register B contents */
static uchar _PM_oldRTCPIC2; /* Mask value for RTC IRQ8 */
/*----------------------------- Implementation ----------------------------*/
/* Globals for locking interrupt handlers in _pmsmx.asm */
extern int _ASMAPI _PM_pmsmxDataStart;
extern int _ASMAPI _PM_pmsmxDataEnd;
void _ASMAPI _PM_pmsmxCodeStart(void);
void _ASMAPI _PM_pmsmxCodeEnd(void);
/* Protected mode interrupt handlers, also called by PM callbacks below */
void _ASMAPI _PM_timerISR(void);
void _ASMAPI _PM_rtcISR(void);
void _ASMAPI _PM_keyISR(void);
void _ASMAPI _PM_key15ISR(void);
void _ASMAPI _PM_breakISR(void);
void _ASMAPI _PM_ctrlCISR(void);
void _ASMAPI _PM_criticalISR(void);
void _ASMAPI _PM_mouseISR(void);
void _ASMAPI _PM_int10PMCB(void);
/* Protected mode DPMI callback handlers */
void _ASMAPI _PM_mousePMCB(void);
/* Routine to install a mouse handler function */
void _ASMAPI _PM_setMouseHandler(int mask);
/* Routine to allocate DPMI real mode callback routines */
void _ASMAPI _DPMI_allocateCallback(void (_ASMAPI *pmcode)(),void *rmregs,long *RMCB);
void _ASMAPI _DPMI_freeCallback(long RMCB);
/* DPMI helper functions in PMLITE.C */
ulong PMAPI DPMI_mapPhysicalToLinear(ulong physAddr,ulong limit);
int PMAPI DPMI_setSelectorBase(ushort sel,ulong linAddr);
ulong PMAPI DPMI_getSelectorBase(ushort sel);
int PMAPI DPMI_setSelectorLimit(ushort sel,ulong limit);
uint PMAPI DPMI_createSelector(ulong base,ulong limit);
void PMAPI DPMI_freeSelector(uint sel);
int PMAPI DPMI_lockLinearPages(ulong linear,ulong len);
int PMAPI DPMI_unlockLinearPages(ulong linear,ulong len);
/* Functions to read and write CMOS registers */
uchar PMAPI _PM_readCMOS(int index);
void PMAPI _PM_writeCMOS(int index,uchar value);
/*-------------------------------------------------------------------------*/
/* Generic routines common to all environments */
/*-------------------------------------------------------------------------*/
void PMAPI PM_resetMouseDriver(int hardReset)
{
ps2MouseReset();
}
void PMAPI PM_setRealTimeClockFrequency(int frequency)
{
static short convert[] = {
8192,
4096,
2048,
1024,
512,
256,
128,
64,
32,
16,
8,
4,
2,
-1,
};
int i;
/* First clear any pending RTC timeout if not cleared */
_PM_readCMOS(0x0C);
if (frequency == 0) {
/* Disable RTC timout */
_PM_writeCMOS(0x0A,_PM_oldCMOSRegA);
_PM_writeCMOS(0x0B,_PM_oldCMOSRegB & 0x0F);
}
else {
/* Convert frequency value to RTC clock indexes */
for (i = 0; convert[i] != -1; i++) {
if (convert[i] == frequency)
break;
}
/* Set RTC timout value and enable timeout */
_PM_writeCMOS(0x0A,(_PM_oldCMOSRegA & 0xF0) | (i+3));
_PM_writeCMOS(0x0B,(_PM_oldCMOSRegB & 0x0F) | 0x40);
}
}
static void PMAPI lockPMHandlers(void)
{
static int locked = 0;
int stat = 0;
PM_lockHandle lh;
/* Lock all of the code and data used by our protected mode interrupt
* handling routines, so that it will continue to work correctly
* under real mode.
*/
if (!locked) {
PM_saveDS();
stat = !PM_lockDataPages(&globalDataStart-2048,4096,&lh);
stat |= !PM_lockDataPages(&_PM_pmsmxDataStart,(int)&_PM_pmsmxDataEnd - (int)&_PM_pmsmxDataStart,&lh);
stat |= !PM_lockCodePages((__codePtr)_PM_pmsmxCodeStart,(int)_PM_pmsmxCodeEnd-(int)_PM_pmsmxCodeStart,&lh);
if (stat) {
printf("Page locking services failed - interrupt handling not safe!\n");
exit(1);
}
locked = 1;
}
}
void PMAPI PM_getPMvect(int intno, PMFARPTR *isr)
{
PMREGS regs;
regs.x.ax = 0x204;
regs.h.bl = intno;
PM_int386(0x31,®s,®s);
isr->sel = regs.x.cx;
isr->off = regs.e.edx;
}
void PMAPI PM_setPMvect(int intno, PM_intHandler isr)
{
PMSREGS sregs;
PMREGS regs;
PM_saveDS();
regs.x.ax = 0x205; /* Set protected mode vector */
regs.h.bl = intno;
PM_segread(&sregs);
regs.x.cx = sregs.cs;
regs.e.edx = (uint)isr;
PM_int386(0x31,®s,®s);
}
void PMAPI PM_restorePMvect(int intno, PMFARPTR isr)
{
PMREGS regs;
regs.x.ax = 0x205;
regs.h.bl = intno;
regs.x.cx = isr.sel;
regs.e.edx = isr.off;
PM_int386(0x31,®s,®s);
}
static long prevRealBreak; /* Previous real mode break handler */
static long prevRealCtrlC; /* Previous real mode CtrlC handler */
static long prevRealCritical; /* Prev real mode critical handler */
int PMAPI PM_setMouseHandler(int mask, PM_mouseHandler mh)
{
lockPMHandlers(); /* Ensure our handlers are locked */
_PM_mouseHandler = mh;
return 0;
}
void PMAPI PM_restoreMouseHandler(void)
{
if (_PM_mouseHandler)
_PM_mouseHandler = NULL;
}
static void getISR(int intno, PMFARPTR *pmisr, long *realisr)
{
PM_getPMvect(intno,pmisr);
}
static void restoreISR(int intno, PMFARPTR pmisr, long realisr)
{
PM_restorePMvect(intno,pmisr);
}
static void setISR(int intno, void (* PMAPI pmisr)())
{
lockPMHandlers(); /* Ensure our handlers are locked */
PM_setPMvect(intno,pmisr);
}
void PMAPI PM_setTimerHandler(PM_intHandler th)
{
getISR(PM_IRQ0, &_PM_prevTimer, &_PM_prevRealTimer);
_PM_timerHandler = th;
setISR(PM_IRQ0, _PM_timerISR);
}
void PMAPI PM_restoreTimerHandler(void)
{
if (_PM_timerHandler) {
restoreISR(PM_IRQ0, _PM_prevTimer, _PM_prevRealTimer);
_PM_timerHandler = NULL;
}
}
ibool PMAPI PM_setRealTimeClockHandler(PM_intHandler th,int frequency)
{
/* Save the old CMOS real time clock values */
_PM_oldCMOSRegA = _PM_readCMOS(0x0A);
_PM_oldCMOSRegB = _PM_readCMOS(0x0B);
/* Set the real time clock interrupt handler */
getISR(0x70, &_PM_prevRTC, &_PM_prevRealRTC);
_PM_rtcHandler = th;
setISR(0x70, _PM_rtcISR);
/* Program the real time clock default frequency */
PM_setRealTimeClockFrequency(frequency);
/* Unmask IRQ8 in the PIC2 */
_PM_oldRTCPIC2 = PM_inpb(0xA1);
PM_outpb(0xA1,_PM_oldRTCPIC2 & 0xFE);
return true;
}
void PMAPI PM_restoreRealTimeClockHandler(void)
{
if (_PM_rtcHandler) {
/* Restore CMOS registers and mask RTC clock */
_PM_writeCMOS(0x0A,_PM_oldCMOSRegA);
_PM_writeCMOS(0x0B,_PM_oldCMOSRegB);
PM_outpb(0xA1,(PM_inpb(0xA1) & 0xFE) | (_PM_oldRTCPIC2 & ~0xFE));
/* Restore the interrupt vector */
restoreISR(0x70, _PM_prevRTC, _PM_prevRealRTC);
_PM_rtcHandler = NULL;
}
}
void PMAPI PM_setKeyHandler(PM_intHandler kh)
{
getISR(PM_IRQ1, &_PM_prevKey, &_PM_prevRealKey);
_PM_keyHandler = kh;
setISR(PM_IRQ1, _PM_keyISR);
}
void PMAPI PM_restoreKeyHandler(void)
{
if (_PM_keyHandler) {
restoreISR(PM_IRQ1, _PM_prevKey, _PM_prevRealKey);
_PM_keyHandler = NULL;
}
}
void PMAPI PM_setKey15Handler(PM_key15Handler kh)
{
getISR(0x15, &_PM_prevKey15, &_PM_prevRealKey15);
_PM_key15Handler = kh;
setISR(0x15, _PM_key15ISR);
}
void PMAPI PM_restoreKey15Handler(void)
{
if (_PM_key15Handler) {
restoreISR(0x15, _PM_prevKey15, _PM_prevRealKey15);
_PM_key15Handler = NULL;
}
}
/* Real mode Ctrl-C and Ctrl-Break handler. This handler simply sets a
* flag in the real mode code segment and exit. We save the location
* of this flag in real mode memory so that both the real mode and
* protected mode code will be modifying the same flags.
*/
static uchar ctrlHandler[] = {
0x00,0x00,0x00,0x00, /* ctrlBFlag */
0x66,0x2E,0xC7,0x06,0x00,0x00,
0x01,0x00,0x00,0x00, /* mov [cs:ctrlBFlag],1 */
0xCF, /* iretf */
};
void PMAPI PM_installAltBreakHandler(PM_breakHandler bh)
{
uint rseg,roff;
getISR(0x1B, &_PM_prevBreak, &prevRealBreak);
getISR(0x23, &_PM_prevCtrlC, &prevRealCtrlC);
_PM_breakHandler = bh;
setISR(0x1B, _PM_breakISR);
setISR(0x23, _PM_ctrlCISR);
/* Hook the real mode vectors for these handlers, as these are not
* normally reflected by the DPMI server up to protected mode
*/
_PM_ctrlBPtr = PM_allocRealSeg(sizeof(ctrlHandler)*2, &rseg, &roff);
memcpy(_PM_ctrlBPtr,ctrlHandler,sizeof(ctrlHandler));
memcpy(_PM_ctrlBPtr+sizeof(ctrlHandler),ctrlHandler,sizeof(ctrlHandler));
_PM_ctrlCPtr = _PM_ctrlBPtr + sizeof(ctrlHandler);
_PM_setRMvect(0x1B,((long)rseg << 16) | (roff+4));
_PM_setRMvect(0x23,((long)rseg << 16) | (roff+sizeof(ctrlHandler)+4));
}
void PMAPI PM_installBreakHandler(void)
{
PM_installAltBreakHandler(NULL);
}
void PMAPI PM_restoreBreakHandler(void)
{
if (_PM_prevBreak.sel) {
restoreISR(0x1B, _PM_prevBreak, prevRealBreak);
restoreISR(0x23, _PM_prevCtrlC, prevRealCtrlC);
_PM_prevBreak.sel = 0;
_PM_breakHandler = NULL;
PM_freeRealSeg(_PM_ctrlBPtr);
}
}
/* Real mode Critical Error handler. This handler simply saves the AX and
* DI values in the real mode code segment and exits. We save the location
* of this flag in real mode memory so that both the real mode and
* protected mode code will be modifying the same flags.
*/
static uchar criticalHandler[] = {
0x00,0x00, /* axCode */
0x00,0x00, /* diCode */
0x2E,0xA3,0x00,0x00, /* mov [cs:axCode],ax */
0x2E,0x89,0x3E,0x02,0x00, /* mov [cs:diCode],di */
0xB8,0x03,0x00, /* mov ax,3 */
0xCF, /* iretf */
};
void PMAPI PM_installAltCriticalHandler(PM_criticalHandler ch)
{
uint rseg,roff;
getISR(0x24, &_PM_prevCritical, &prevRealCritical);
_PM_critHandler = ch;
setISR(0x24, _PM_criticalISR);
/* Hook the real mode vector, as this is not normally reflected by the
* DPMI server up to protected mode.
*/
_PM_critPtr = PM_allocRealSeg(sizeof(criticalHandler)*2, &rseg, &roff);
memcpy(_PM_critPtr,criticalHandler,sizeof(criticalHandler));
_PM_setRMvect(0x24,((long)rseg << 16) | (roff+4));
}
void PMAPI PM_installCriticalHandler(void)
{
PM_installAltCriticalHandler(NULL);
}
void PMAPI PM_restoreCriticalHandler(void)
{
if (_PM_prevCritical.sel) {
restoreISR(0x24, _PM_prevCritical, prevRealCritical);
PM_freeRealSeg(_PM_critPtr);
_PM_prevCritical.sel = 0;
_PM_critHandler = NULL;
}
}
int PMAPI PM_lockDataPages(void *p,uint len,PM_lockHandle *lh)
{
PMSREGS sregs;
PM_segread(&sregs);
return DPMI_lockLinearPages((uint)p + DPMI_getSelectorBase(sregs.ds),len);
}
int PMAPI PM_unlockDataPages(void *p,uint len,PM_lockHandle *lh)
{
PMSREGS sregs;
PM_segread(&sregs);
return DPMI_unlockLinearPages((uint)p + DPMI_getSelectorBase(sregs.ds),len);
}
int PMAPI PM_lockCodePages(void (*p)(),uint len,PM_lockHandle *lh)
{
PMSREGS sregs;
PM_segread(&sregs);
/*AM: causes minor glitch with */
/*AM: older versions pmEasy which don't allow DPMI 06 on */
/*AM: Code selector 0x0C -- assume base is 0 which it should be. */
return DPMI_lockLinearPages((uint)p,len);
}
int PMAPI PM_unlockCodePages(void (*p)(),uint len,PM_lockHandle *lh)
{
PMSREGS sregs;
PM_segread(&sregs);
return DPMI_unlockLinearPages((uint)p,len);
}
