ref: ca4cc1cb602c098dba51bb9f8e5da6b9a2827a7a
dir: /u/sys_dos.c/
/*
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 <errno.h>
#include <unistd.h>
#include <signal.h>
#include <stdlib.h>
#include <limits.h>
#include <sys/time.h>
#include <sys/types.h>
#include <dir.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdarg.h>
#include <stdio.h>
#include <sys/stat.h>
#include <string.h>
#include <dpmi.h>
#include <sys/nearptr.h>
#include <conio.h>
#include "quakedef.h"
#include "dosisms.h"
#define MINIMUM_WIN_MEMORY 0x800000
#define MINIMUM_WIN_MEMORY_LEVELPAK (MINIMUM_WIN_MEMORY + 0x100000)
int end_of_memory;
qboolean lockmem, lockunlockmem, unlockmem;
static int win95;
#define STDOUT 1
#define KEYBUF_SIZE 256
static unsigned char keybuf[KEYBUF_SIZE];
static int keybuf_head=0;
static int keybuf_tail=0;
static quakeparms_t quakeparms;
int sys_checksum;
static double curtime = 0.0;
static double lastcurtime = 0.0;
static double oldtime = 0.0;
static qboolean isDedicated;
static int minmem;
float fptest_temp;
extern char start_of_memory __asm__("start");
//=============================================================================
// this is totally dependent on cwsdpmi putting the stack right after tge
// global data
// This does evil things in a Win95 DOS box!!!
#if 0
extern byte end;
#define CHECKBYTE 0xed
void Sys_InitStackCheck (void)
{
int i;
for (i=0 ; i<128*1024 ; i++)
(&end)[i] = CHECKBYTE;
}
void Sys_StackCheck (void)
{
int i;
for (i=0 ; i<128*1024 ; i++)
if ( (&end)[i] != CHECKBYTE )
break;
Con_Printf ("%i undisturbed stack bytes\n", i);
if (end != CHECKBYTE)
Sys_Error ("System stack overflow!");
}
#endif
//=============================================================================
byte scantokey[128] =
{
// 0 1 2 3 4 5 6 7
// 8 9 A B C D E F
0 , 27, '1', '2', '3', '4', '5', '6',
'7', '8', '9', '0', '-', '=', K_BACKSPACE, 9, // 0
'q', 'w', 'e', 'r', 't', 'y', 'u', 'i',
'o', 'p', '[', ']', 13 , K_CTRL,'a', 's', // 1
'd', 'f', 'g', 'h', 'j', 'k', 'l', ';',
'\'' , '`', K_SHIFT,'\\', 'z', 'x', 'c', 'v', // 2
'b', 'n', 'm', ',', '.', '/', K_SHIFT,'*',
K_ALT,' ', 0 , K_F1, K_F2, K_F3, K_F4, K_F5, // 3
K_F6, K_F7, K_F8, K_F9, K_F10,0 , 0 , K_HOME,
K_UPARROW,K_PGUP,'-',K_LEFTARROW,'5',K_RIGHTARROW,'+',K_END, //4
K_DOWNARROW,K_PGDN,K_INS,K_DEL,0,0, 0, K_F11,
K_F12,0 , 0 , 0 , 0 , 0 , 0 , 0, // 5
0 , 0 , 0 , 0 , 0 , 0 , 0 , 0,
0 , 0 , 0 , 0 , 0 , 0 , 0 , 0, // 6
0 , 0 , 0 , 0 , 0 , 0 , 0 , 0,
0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 // 7
};
byte shiftscantokey[128] =
{
// 0 1 2 3 4 5 6 7
// 8 9 A B C D E F
0 , 27, '!', '@', '#', '$', '%', '^',
'&', '*', '(', ')', '_', '+', K_BACKSPACE, 9, // 0
'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I',
'O', 'P', '{', '}', 13 , K_CTRL,'A', 'S', // 1
'D', 'F', 'G', 'H', 'J', 'K', 'L', ':',
'"' , '~', K_SHIFT,'|', 'Z', 'X', 'C', 'V', // 2
'B', 'N', 'M', '<', '>', '?', K_SHIFT,'*',
K_ALT,' ', 0 , K_F1, K_F2, K_F3, K_F4, K_F5, // 3
K_F6, K_F7, K_F8, K_F9, K_F10,0 , 0 , K_HOME,
K_UPARROW,K_PGUP,'_',K_LEFTARROW,'%',K_RIGHTARROW,'+',K_END, //4
K_DOWNARROW,K_PGDN,K_INS,K_DEL,0,0, 0, K_F11,
K_F12,0 , 0 , 0 , 0 , 0 , 0 , 0, // 5
0 , 0 , 0 , 0 , 0 , 0 , 0 , 0,
0 , 0 , 0 , 0 , 0 , 0 , 0 , 0, // 6
0 , 0 , 0 , 0 , 0 , 0 , 0 , 0,
0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 // 7
};
void TrapKey(void)
{
// static int ctrl=0;
keybuf[keybuf_head] = dos_inportb(0x60);
dos_outportb(0x20, 0x20);
/*
if (scantokey[keybuf[keybuf_head]&0x7f] == K_CTRL)
ctrl=keybuf[keybuf_head]&0x80;
if (ctrl && scantokey[keybuf[keybuf_head]&0x7f] == 'c')
Sys_Error("ctrl-c hit\n");
*/
keybuf_head = (keybuf_head + 1) & (KEYBUF_SIZE-1);
}
#define SC_UPARROW 0x48
#define SC_DOWNARROW 0x50
#define SC_LEFTARROW 0x4b
#define SC_RIGHTARROW 0x4d
#define SC_LEFTSHIFT 0x2a
#define SC_RIGHTSHIFT 0x36
#define SC_RIGHTARROW 0x4d
void MaskExceptions (void);
void Sys_InitFloatTime (void);
void Sys_PushFPCW_SetHigh (void);
void Sys_PopFPCW (void);
#define LEAVE_FOR_CACHE (512*1024) //FIXME: tune
#define LOCKED_FOR_MALLOC (128*1024) //FIXME: tune
void Sys_DetectWin95 (void)
{
__dpmi_regs r;
r.x.ax = 0x160a; /* Get Windows Version */
__dpmi_int(0x2f, &r);
if(r.x.ax || r.h.bh < 4) /* Not windows or earlier than Win95 */
{
win95 = 0;
lockmem = true;
lockunlockmem = false;
unlockmem = true;
}
else
{
win95 = 1;
lockunlockmem = COM_CheckParm ("-winlockunlock");
if (lockunlockmem)
lockmem = true;
else
lockmem = COM_CheckParm ("-winlock");
unlockmem = lockmem && !lockunlockmem;
}
}
void *dos_getmaxlockedmem(int *size)
{
__dpmi_free_mem_info meminfo;
__dpmi_meminfo info;
int working_size;
void *working_memory;
int last_locked;
int extra, i, j, allocsize;
static char *msg = "Locking data...";
int m, n;
byte *x;
// first lock all the current executing image so the locked count will
// be accurate. It doesn't hurt to lock the memory multiple times
last_locked = __djgpp_selector_limit + 1;
info.size = last_locked - 4096;
info.address = __djgpp_base_address + 4096;
if (lockmem)
{
if(__dpmi_lock_linear_region(&info))
{
Sys_Error ("Lock of current memory at 0x%lx for %ldKb failed!\n",
info.address, info.size/1024);
}
}
__dpmi_get_free_memory_information(&meminfo);
if (!win95) /* Not windows or earlier than Win95 */
{
working_size = meminfo.maximum_locked_page_allocation_in_pages * 4096;
}
else
{
working_size = meminfo.largest_available_free_block_in_bytes -
LEAVE_FOR_CACHE;
}
working_size &= ~0xffff; /* Round down to 64K */
working_size += 0x10000;
do
{
working_size -= 0x10000; /* Decrease 64K and try again */
working_memory = sbrk(working_size);
} while (working_memory == (void *)-1);
extra = 0xfffc - ((unsigned)sbrk(0) & 0xffff);
if (extra > 0)
{
sbrk(extra);
working_size += extra;
}
// now grab the memory
info.address = last_locked + __djgpp_base_address;
if (!win95)
{
info.size = __djgpp_selector_limit + 1 - last_locked;
while (info.size > 0 && __dpmi_lock_linear_region(&info))
{
info.size -= 0x1000;
working_size -= 0x1000;
sbrk(-0x1000);
}
}
else
{ /* Win95 section */
j = COM_CheckParm("-winmem");
if (standard_quake)
minmem = MINIMUM_WIN_MEMORY;
else
minmem = MINIMUM_WIN_MEMORY_LEVELPAK;
if (j)
{
allocsize = ((int)(Q_atoi(com_argv[j+1]))) * 0x100000 +
LOCKED_FOR_MALLOC;
if (allocsize < (minmem + LOCKED_FOR_MALLOC))
allocsize = minmem + LOCKED_FOR_MALLOC;
}
else
{
allocsize = minmem + LOCKED_FOR_MALLOC;
}
if (!lockmem)
{
// we won't lock, just sbrk the memory
info.size = allocsize;
goto UpdateSbrk;
}
// lock the memory down
write (STDOUT, msg, strlen (msg));
for (j=allocsize ; j>(minmem + LOCKED_FOR_MALLOC) ;
j -= 0x100000)
{
info.size = j;
if (!__dpmi_lock_linear_region(&info))
goto Locked;
write (STDOUT, ".", 1);
}
// finally, try with the absolute minimum amount
for (i=0 ; i<10 ; i++)
{
info.size = minmem + LOCKED_FOR_MALLOC;
if (!__dpmi_lock_linear_region(&info))
goto Locked;
}
Sys_Error ("Can't lock memory; %d Mb lockable RAM required. "
"Try shrinking smartdrv.", info.size / 0x100000);
Locked:
UpdateSbrk:
info.address += info.size;
info.address -= __djgpp_base_address + 4; // ending point, malloc align
working_size = info.address - (int)working_memory;
sbrk(info.address-(int)sbrk(0)); // negative adjustment
}
if (lockunlockmem)
{
__dpmi_unlock_linear_region (&info);
printf ("Locked and unlocked %d Mb data\n", working_size / 0x100000);
}
else if (lockmem)
{
printf ("Locked %d Mb data\n", working_size / 0x100000);
}
else
{
printf ("Allocated %d Mb data\n", working_size / 0x100000);
}
// touch all the memory to make sure it's there. The 16-page skip is to
// keep Win 95 from thinking we're trying to page ourselves in (we are
// doing that, of course, but there's no reason we shouldn't)
x = (byte *)working_memory;
for (n=0 ; n<4 ; n++)
{
for (m=0 ; m<(working_size - 16 * 0x1000) ; m += 4)
{
sys_checksum += *(int *)&x[m];
sys_checksum += *(int *)&x[m + 16 * 0x1000];
}
}
// give some of what we locked back for malloc before returning. Done
// by cheating and passing a negative value to sbrk
working_size -= LOCKED_FOR_MALLOC;
sbrk( -(LOCKED_FOR_MALLOC));
*size = working_size;
return working_memory;
}
/*
============
Sys_FileTime
returns -1 if not present
============
*/
int Sys_FileTime (char *path)
{
struct stat buf;
if (stat (path,&buf) == -1)
return -1;
return buf.st_mtime;
}
void Sys_mkdir (char *path)
{
mkdir (path, 0777);
}
void Sys_Sleep(void)
{
}
char *Sys_ConsoleInput(void)
{
static char text[256];
static int len = 0;
char ch;
if (!isDedicated)
return NULL;
if (! kbhit())
return NULL;
ch = getche();
switch (ch)
{
case '\r':
putch('\n');
if (len)
{
text[len] = 0;
len = 0;
return text;
}
break;
case '\b':
putch(' ');
if (len)
{
len--;
putch('\b');
}
break;
default:
text[len] = ch;
len = (len + 1) & 0xff;
break;
}
return NULL;
}
void Sys_Init(void)
{
MaskExceptions ();
Sys_SetFPCW ();
dos_outportb(0x43, 0x34); // set system timer to mode 2
dos_outportb(0x40, 0); // for the Sys_FloatTime() function
dos_outportb(0x40, 0);
Sys_InitFloatTime ();
_go32_interrupt_stack_size = 4 * 1024;;
_go32_rmcb_stack_size = 4 * 1024;
}
void Sys_Shutdown(void)
{
if (!isDedicated)
dos_restoreintr(9);
if (unlockmem)
{
dos_unlockmem (&start_of_memory,
end_of_memory - (int)&start_of_memory);
dos_unlockmem (quakeparms.membase, quakeparms.memsize);
}
}
#define SC_RSHIFT 0x36
#define SC_LSHIFT 0x2a
void Sys_SendKeyEvents (void)
{
int k, next;
int outkey;
// get key events
while (keybuf_head != keybuf_tail)
{
k = keybuf[keybuf_tail++];
keybuf_tail &= (KEYBUF_SIZE-1);
if (k==0xe0)
continue; // special / pause keys
next = keybuf[(keybuf_tail-2)&(KEYBUF_SIZE-1)];
if (next == 0xe1)
continue; // pause key bullshit
if (k==0xc5 && next == 0x9d)
{
Key_Event (K_PAUSE, true);
continue;
}
// extended keyboard shift key bullshit
if ( (k&0x7f)==SC_LSHIFT || (k&0x7f)==SC_RSHIFT )
{
if ( keybuf[(keybuf_tail-2)&(KEYBUF_SIZE-1)]==0xe0 )
continue;
k &= 0x80;
k |= SC_RSHIFT;
}
if (k==0xc5 && keybuf[(keybuf_tail-2)&(KEYBUF_SIZE-1)] == 0x9d)
continue; // more pause bullshit
outkey = scantokey[k & 0x7f];
if (k & 0x80)
Key_Event (outkey, false);
else
Key_Event (outkey, true);
}
}
// =======================================================================
// General routines
// =======================================================================
/*
================
Sys_Printf
================
*/
void Sys_Printf (char *fmt, ...)
{
va_list argptr;
char text[1024];
va_start (argptr,fmt);
vsprintf (text,fmt,argptr);
va_end (argptr);
if (cls.state == ca_dedicated)
fprintf(stderr, "%s", text);
}
void Sys_AtExit (void)
{
// shutdown only once (so Sys_Error can call this function to shutdown, then
// print the error message, then call exit without exit calling this function
// again)
Sys_Shutdown();
}
void Sys_Quit (void)
{
byte screen[80*25*2];
byte *d;
char ver[6];
int i;
// load the sell screen before shuting everything down
if (registered.value)
d = COM_LoadHunkFile ("end2.bin");
else
d = COM_LoadHunkFile ("end1.bin");
if (d)
memcpy (screen, d, sizeof(screen));
// write the version number directly to the end screen
sprintf (ver, " v%4.2f", VERSION);
for (i=0 ; i<6 ; i++)
screen[0*80*2 + 72*2 + i*2] = ver[i];
Host_Shutdown();
// do the text mode sell screen
if (d)
{
memcpy ((void *)real2ptr(0xb8000), screen,80*25*2);
// set text pos
regs.x.ax = 0x0200;
regs.h.bh = 0;
regs.h.dl = 0;
regs.h.dh = 22;
dos_int86 (0x10);
}
else
printf ("couldn't load endscreen.\n");
exit(0);
}
void Sys_Error (char *error, ...)
{
va_list argptr;
char string[1024];
va_start (argptr,error);
vsprintf (string,error,argptr);
va_end (argptr);
Host_Shutdown();
fprintf(stderr, "Error: %s\n", string);
// Sys_AtExit is called by exit to shutdown the system
exit(0);
}
int Sys_FileOpenRead (char *path, int *handle)
{
int h;
struct stat fileinfo;
h = open (path, O_RDONLY|O_BINARY, 0666);
*handle = h;
if (h == -1)
return -1;
if (fstat (h,&fileinfo) == -1)
Sys_Error ("Error fstating %s", path);
return fileinfo.st_size;
}
int Sys_FileOpenWrite (char *path)
{
int handle;
umask (0);
handle = open(path,O_RDWR | O_BINARY | O_CREAT | O_TRUNC
, 0666);
if (handle == -1)
Sys_Error ("Error opening %s: %s", path,strerror(errno));
return handle;
}
void Sys_FileClose (int handle)
{
close (handle);
}
void Sys_FileSeek (int handle, int position)
{
lseek (handle, position, SEEK_SET);
}
int Sys_FileRead (int handle, void *dest, int count)
{
return read (handle, dest, count);
}
int Sys_FileWrite (int handle, void *data, int count)
{
return write (handle, data, count);
}
/*
================
Sys_MakeCodeWriteable
================
*/
void Sys_MakeCodeWriteable (unsigned long startaddr, unsigned long length)
{
// it's always writeable
}
/*
================
Sys_FloatTime
================
*/
double Sys_FloatTime (void)
{
int r;
unsigned t, tick;
double ft, time;
static int sametimecount;
Sys_PushFPCW_SetHigh ();
//{static float t = 0; t=t+0.05; return t;} // DEBUG
t = *(unsigned short*)real2ptr(0x46c) * 65536;
dos_outportb(0x43, 0); // latch time
r = dos_inportb(0x40);
r |= dos_inportb(0x40) << 8;
r = (r-1) & 0xffff;
tick = *(unsigned short*)real2ptr(0x46c) * 65536;
if ((tick != t) && (r & 0x8000))
t = tick;
ft = (double) (t+(65536-r)) / 1193200.0;
time = ft - oldtime;
oldtime = ft;
if (time < 0)
{
if (time > -3000.0)
time = 0.0;
else
time += 3600.0;
}
curtime += time;
if (curtime == lastcurtime)
{
sametimecount++;
if (sametimecount > 100000)
{
curtime += 1.0;
sametimecount = 0;
}
}
else
{
sametimecount = 0;
}
lastcurtime = curtime;
Sys_PopFPCW ();
return curtime;
}
/*
================
Sys_InitFloatTime
================
*/
void Sys_InitFloatTime (void)
{
int j;
Sys_FloatTime ();
oldtime = curtime;
j = COM_CheckParm("-starttime");
if (j)
{
curtime = (double) (Q_atof(com_argv[j+1]));
}
else
{
curtime = 0.0;
}
lastcurtime = curtime;
}
/*
================
Sys_GetMemory
================
*/
void Sys_GetMemory(void)
{
int j, tsize;
j = COM_CheckParm("-mem");
if (j)
{
quakeparms.memsize = (int) (Q_atof(com_argv[j+1]) * 1024 * 1024);
quakeparms.membase = malloc (quakeparms.memsize);
}
else
{
quakeparms.membase = dos_getmaxlockedmem (&quakeparms.memsize);
}
fprintf(stderr, "malloc'd: %d\n", quakeparms.memsize);
if (COM_CheckParm ("-heapsize"))
{
tsize = Q_atoi (com_argv[COM_CheckParm("-heapsize") + 1]) * 1024;
if (tsize < quakeparms.memsize)
quakeparms.memsize = tsize;
}
}
/*
================
Sys_PageInProgram
walks the text, data, and bss to make sure it's all paged in so that the
actual physical memory detected by Sys_GetMemory is correct.
================
*/
void Sys_PageInProgram(void)
{
int i, j;
end_of_memory = (int)sbrk(0);
if (lockmem)
{
if (dos_lockmem ((void *)&start_of_memory,
end_of_memory - (int)&start_of_memory))
Sys_Error ("Couldn't lock text and data");
}
if (lockunlockmem)
{
dos_unlockmem((void *)&start_of_memory,
end_of_memory - (int)&start_of_memory);
printf ("Locked and unlocked %d Mb image\n",
(end_of_memory - (int)&start_of_memory) / 0x100000);
}
else if (lockmem)
{
printf ("Locked %d Mb image\n",
(end_of_memory - (int)&start_of_memory) / 0x100000);
}
else
{
printf ("Loaded %d Mb image\n",
(end_of_memory - (int)&start_of_memory) / 0x100000);
}
// touch the entire image, doing the 16-page skip so Win95 doesn't think we're
// trying to page ourselves in
for (j=0 ; j<4 ; j++)
{
for(i=(int)&start_of_memory ; i<(end_of_memory - 16 * 0x1000) ; i += 4)
{
sys_checksum += *(int *)i;
sys_checksum += *(int *)(i + 16 * 0x1000);
}
}
}
/*
================
Sys_NoFPUExceptionHandler
================
*/
void Sys_NoFPUExceptionHandler(int whatever)
{
printf ("\nError: Quake requires a floating-point processor\n");
exit (0);
}
/*
================
Sys_DefaultExceptionHandler
================
*/
void Sys_DefaultExceptionHandler(int whatever)
{
}
/*
================
main
================
*/
int main (int c, char **v)
{
double time, oldtime, newtime;
extern void (*dos_error_func)(char *, ...);
static char cwd[1024];
printf ("Quake v%4.2f\n", VERSION);
// make sure there's an FPU
signal(SIGNOFP, Sys_NoFPUExceptionHandler);
signal(SIGABRT, Sys_DefaultExceptionHandler);
signal(SIGALRM, Sys_DefaultExceptionHandler);
signal(SIGKILL, Sys_DefaultExceptionHandler);
signal(SIGQUIT, Sys_DefaultExceptionHandler);
signal(SIGINT, Sys_DefaultExceptionHandler);
if (fptest_temp >= 0.0)
fptest_temp += 0.1;
COM_InitArgv (c, v);
quakeparms.argc = com_argc;
quakeparms.argv = com_argv;
dos_error_func = Sys_Error;
Sys_DetectWin95 ();
Sys_PageInProgram ();
Sys_GetMemory ();
atexit (Sys_AtExit); // in case we crash
getwd (cwd);
if (cwd[Q_strlen(cwd)-1] == '/') cwd[Q_strlen(cwd)-1] = 0;
quakeparms.basedir = cwd; //"f:/quake";
isDedicated = (COM_CheckParm ("-dedicated") != 0);
Sys_Init ();
if (!isDedicated)
dos_registerintr(9, TrapKey);
//Sys_InitStackCheck ();
Host_Init(&quakeparms);
//Sys_StackCheck ();
//Con_Printf ("Top of stack: 0x%x\n", &time);
oldtime = Sys_FloatTime ();
while (1)
{
newtime = Sys_FloatTime ();
time = newtime - oldtime;
if (cls.state == ca_dedicated && (time<sys_ticrate.value))
continue;
Host_Frame (time);
//Sys_StackCheck ();
oldtime = newtime;
}
}