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/*
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 <sys/segments.h>
#include <go32.h>
#include <unistd.h>
#include <sys/nearptr.h>
#include <dos.h>
#include <string.h>
#include <dpmi.h>
// #include <osfcn.h>
#include <bios.h>
#include "dosisms.h"
_go32_dpmi_registers hmm;
// globals
regs_t regs;
void (*dos_error_func)(char *msg, ...);
static unsigned conventional_memory = -1;
__dpmi_regs callback_regs;
void map_in_conventional_memory(void)
{
if (conventional_memory == -1)
{
if (__djgpp_nearptr_enable())
{
conventional_memory = __djgpp_conventional_base;
}
}
}
unsigned int ptr2real(void *ptr)
{
map_in_conventional_memory();
return (int)ptr - conventional_memory;
}
void *real2ptr(unsigned int real)
{
map_in_conventional_memory();
return (void *) (real + conventional_memory);
}
void *far2ptr(unsigned int farptr)
{
return real2ptr(((farptr & ~0xffff) >>12) + (farptr&0xffff));
}
unsigned int ptr2far(void *ptr)
{
return ((ptr2real(ptr)&~0xf) << 12) + (ptr2real(ptr) & 0xf);
}
int dos_inportb(int port)
{
return inportb(port);
}
int dos_inportw(int port)
{
return inportw(port);
}
void dos_outportb(int port, int val)
{
outportb(port, val);
}
void dos_outportw(int port, int val)
{
outportw(port, val);
}
void dos_irqenable(void)
{
enable();
}
void dos_irqdisable(void)
{
disable();
}
//
// Returns 0 on success
//
int dos_int86(int vec)
{
int rc;
regs.x.ss = regs.x.sp = 0;
rc = _go32_dpmi_simulate_int(vec, (_go32_dpmi_registers *) &regs);
return rc || (regs.x.flags & 1);
}
int dos_int386(int vec, regs_t *inregs, regs_t *outregs)
{
int rc;
memcpy(outregs, inregs, sizeof(regs_t));
outregs->x.ss = outregs->x.sp = 0;
rc = _go32_dpmi_simulate_int(vec, (_go32_dpmi_registers *) outregs);
return rc || (outregs->x.flags & 1);
}
//
// Because of a quirk in dj's alloc-dos-memory wrapper, you need to keep
// the seginfo structure around for when you free the mem.
//
static _go32_dpmi_seginfo seginfo[10];
void *dos_getmemory(int size)
{
int rc;
_go32_dpmi_seginfo info;
static int firsttime=1;
int i;
if (firsttime)
{
memset(seginfo, 0, sizeof(seginfo));
firsttime = 0;
}
info.size = (size+15) / 16;
rc = _go32_dpmi_allocate_dos_memory(&info);
if (rc)
return 0;
for (i=0;i<10;i++)
if (!seginfo[i].rm_segment) break;
seginfo[i] = info;
return real2ptr((int) info.rm_segment << 4);
}
void dos_freememory(void *ptr)
{
int i;
int segment;
segment = ptr2real(ptr) >> 4;
for (i=0 ; i<10 ; i++)
if (seginfo[i].rm_segment == segment)
{
_go32_dpmi_free_dos_memory(&seginfo[i]);
seginfo[i].rm_segment = 0;
break;
}
}
static struct handlerhistory_s
{
int intr;
_go32_dpmi_seginfo pm_oldvec;
} handlerhistory[4];
static int handlercount=0;
void dos_registerintr(int intr, void (*handler)(void))
{
_go32_dpmi_seginfo info;
struct handlerhistory_s *oldstuff;
oldstuff = &handlerhistory[handlercount];
// remember old handler
_go32_dpmi_get_protected_mode_interrupt_vector(intr, &oldstuff->pm_oldvec);
oldstuff->intr = intr;
info.pm_offset = (int) handler;
_go32_dpmi_allocate_iret_wrapper(&info);
// set new protected mode handler
_go32_dpmi_set_protected_mode_interrupt_vector(intr, &info);
handlercount++;
}
void dos_restoreintr(int intr)
{
int i;
struct handlerhistory_s *oldstuff;
// find and reinstall previous interrupt
for (i=0 ; i<handlercount ; i++)
{
oldstuff = &handlerhistory[i];
if (oldstuff->intr == intr)
{
_go32_dpmi_set_protected_mode_interrupt_vector(intr,
&oldstuff->pm_oldvec);
oldstuff->intr = -1;
break;
}
}
}
void dos_usleep(int usecs)
{
usleep(usecs);
}
int dos_getheapsize(void)
{
return _go32_dpmi_remaining_physical_memory();
}
int dos_lockmem(void *addr, int size)
{
__dpmi_meminfo info;
info.address = (long) addr + __djgpp_base_address;
info.size = size;
if (__dpmi_lock_linear_region(&info))
return __dpmi_error;
else
return 0;
}
int dos_unlockmem(void *addr, int size)
{
__dpmi_meminfo info;
info.address = (long) addr + __djgpp_base_address;
info.size = size;
if (__dpmi_unlock_linear_region(&info))
return __dpmi_error;
else
return 0;
}
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