305573cb29
a group of dos emulator developers. Submitted by: Jonathan Lemon <jlemon@americantv.com> Obtained from: BSDI
326 lines
6.6 KiB
C
326 lines
6.6 KiB
C
/*
|
|
* Copyright (c) 1992, 1993, 1996
|
|
* Berkeley Software Design, Inc. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by Berkeley Software
|
|
* Design, Inc.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY Berkeley Software Design, Inc. ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL Berkeley Software Design, Inc. BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* BSDI mem.c,v 2.2 1996/04/08 19:32:57 bostic Exp
|
|
*
|
|
* $Id: mem.c,v 1.4 1996/09/22 15:42:57 miff Exp $
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include "doscmd.h"
|
|
|
|
#define Mark(x) (*(char *) (x))
|
|
#define Owner(x) (*(u_short *) ((char *)(x)+1))
|
|
#define Size(x) (*(u_short *) ((char *)(x)+3))
|
|
#define Next(x) ((char *)(x) + (Size(x)+1)*16)
|
|
|
|
/* exports */
|
|
char *dosmem;
|
|
|
|
/* locals */
|
|
static int dosmem_size;
|
|
|
|
static char *next_p = (char *)0;
|
|
static char *end_p = (char *)0xB0000L;
|
|
|
|
static char *
|
|
core_alloc(int *size)
|
|
{
|
|
char *ret;
|
|
if (*size) {
|
|
if (*size & 0xfff) {
|
|
*size = (*size & ~0xfff) + 0x1000;
|
|
}
|
|
} else {
|
|
*size = end_p - next_p;
|
|
}
|
|
|
|
if (next_p + *size > end_p) {
|
|
return NULL;
|
|
}
|
|
|
|
ret = next_p;
|
|
next_p += *size;
|
|
return ret;
|
|
}
|
|
|
|
void
|
|
mem_free_owner(int owner)
|
|
{
|
|
char *mp;
|
|
|
|
debug(D_MEMORY, " : freeow(%04x)\n", owner);
|
|
|
|
for (mp = dosmem; ; mp = Next(mp)) {
|
|
if (Owner(mp) == owner)
|
|
Owner(mp) = 0;
|
|
|
|
if (Mark(mp) != 'M')
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void
|
|
mem_print(void)
|
|
{
|
|
char *mp;
|
|
|
|
for (mp = dosmem; ; mp = Next(mp)) {
|
|
debug(D_ALWAYS, "%05x: mark %c owner %04x size %04x\n",
|
|
mp, Mark(mp), Owner(mp), Size(mp));
|
|
|
|
if (Mark(mp) != 'M')
|
|
break;
|
|
}
|
|
}
|
|
|
|
void
|
|
mem_change_owner(int addr, int owner)
|
|
{
|
|
char *mp;
|
|
|
|
debug(D_MEMORY, "%04x: owner (%04x)\n", addr, owner);
|
|
addr <<= 4;
|
|
|
|
for (mp = dosmem; ; mp = Next(mp)) {
|
|
if ((int)(mp + 16) == addr)
|
|
goto found;
|
|
|
|
if (Mark(mp) != 'M')
|
|
break;
|
|
}
|
|
|
|
debug(D_ALWAYS, "%05x: illegal block in change owner\n", addr);
|
|
mem_print();
|
|
return;
|
|
|
|
found:
|
|
Owner(mp) = owner;
|
|
}
|
|
|
|
void
|
|
mem_init(void)
|
|
{
|
|
int base, avail_memory;
|
|
|
|
base = 0x600;
|
|
core_alloc(&base);
|
|
|
|
avail_memory = MAX_AVAIL_SEG * 16 - base;
|
|
dosmem = core_alloc(&avail_memory);
|
|
|
|
if (!dosmem || dosmem != (char *)base)
|
|
fatal("internal memory error\n");
|
|
|
|
dosmem_size = avail_memory / 16;
|
|
|
|
debug(D_MEMORY, "dosmem = 0x%x base = 0x%x avail = 0x%x (%dK)\n",
|
|
dosmem, base, dosmem_size, avail_memory / 1024);
|
|
|
|
Mark(dosmem) = 'Z';
|
|
Owner(dosmem) = 0;
|
|
Size(dosmem) = dosmem_size - 1;
|
|
}
|
|
|
|
static void
|
|
mem_unsplit(char *mp, int size)
|
|
{
|
|
char *nmp;
|
|
|
|
while (Mark(mp) == 'M' && Size(mp) < size) {
|
|
nmp = Next(mp);
|
|
|
|
if (Owner(nmp) != 0)
|
|
break;
|
|
|
|
Size(mp) += Size(nmp) + 1;
|
|
Mark(mp) = Mark(nmp);
|
|
}
|
|
}
|
|
|
|
static void
|
|
mem_split(char *mp, int size)
|
|
{
|
|
char *nmp;
|
|
int rest;
|
|
|
|
rest = Size(mp) - size;
|
|
Size(mp) = size;
|
|
nmp = Next(mp);
|
|
Mark(nmp) = Mark(mp);
|
|
Mark(mp) = 'M';
|
|
Owner(nmp) = 0;
|
|
Size(nmp) = rest - 1;
|
|
}
|
|
|
|
int
|
|
mem_alloc(int size, int owner, int *biggestp)
|
|
{
|
|
char *mp;
|
|
int biggest;
|
|
|
|
biggest = 0;
|
|
for (mp = dosmem; ; mp = Next(mp)) {
|
|
if (Owner(mp) == 0) {
|
|
if (Size(mp) < size)
|
|
mem_unsplit(mp, size);
|
|
if (Size(mp) >= size)
|
|
goto got;
|
|
|
|
if (Size(mp) > biggest)
|
|
biggest = Size(mp);
|
|
}
|
|
|
|
if (Mark(mp) != 'M')
|
|
break;
|
|
}
|
|
|
|
debug(D_MEMORY, "%04x: alloc(%04x, owner %04x) failed -> %d\n",
|
|
0, size, owner, biggest);
|
|
|
|
if (biggestp)
|
|
*biggestp = biggest;
|
|
return 0;
|
|
|
|
got:
|
|
if (Size(mp) > size)
|
|
mem_split(mp, size);
|
|
Owner(mp) = owner;
|
|
debug(D_MEMORY, "%04x: alloc(%04x, owner %04x)\n",
|
|
(int)mp/16 + 1, size, owner);
|
|
|
|
if (biggestp)
|
|
*biggestp = size;
|
|
return (int)mp/16 + 1;
|
|
}
|
|
|
|
int
|
|
mem_adjust(int addr, int size, int *availp)
|
|
{
|
|
char *mp;
|
|
int delta, nxtsiz;
|
|
|
|
debug(D_MEMORY, "%04x: adjust(%05x)\n", addr, size);
|
|
addr <<= 4;
|
|
|
|
for (mp = dosmem; ; mp = Next(mp)) {
|
|
if ((int)(mp + 16) == addr)
|
|
goto found;
|
|
|
|
if (Mark(mp) != 'M')
|
|
break;
|
|
}
|
|
|
|
debug(D_ALWAYS, "%05x: illegal block in adjust\n", addr);
|
|
mem_print();
|
|
return -2;
|
|
|
|
found:
|
|
if (Size(mp) < size)
|
|
mem_unsplit(mp, size);
|
|
if (Size(mp) >= size)
|
|
goto got;
|
|
|
|
debug(D_MEMORY, "%04x: adjust(%04x) failed -> %d\n",
|
|
(int)mp/16 + 1, size, Size(mp));
|
|
|
|
if (availp)
|
|
*availp = Size(mp);
|
|
return -1;
|
|
|
|
got:
|
|
if (Size(mp) > size)
|
|
mem_split(mp, size);
|
|
debug(D_MEMORY, "%04x: adjust(%04x)\n",
|
|
(int)mp/16 + 1, size);
|
|
|
|
if (availp)
|
|
*availp = size;
|
|
return 0;
|
|
}
|
|
|
|
|
|
|
|
#ifdef MEM_TEST
|
|
mem_check ()
|
|
{
|
|
struct mem_block *mp;
|
|
for (mp = mem_blocks.next; mp != &mem_blocks; mp = mp->next) {
|
|
if (mp->addr + mp->size != mp->next->addr)
|
|
break;
|
|
if (mp->inuse && mp->size == 0)
|
|
return (-1);
|
|
}
|
|
|
|
if (mp->next != &mem_blocks)
|
|
return (-1);
|
|
return (0);
|
|
}
|
|
|
|
char *blocks[10];
|
|
|
|
main ()
|
|
{
|
|
int i;
|
|
int n;
|
|
int newsize;
|
|
|
|
mem_init (0, 300);
|
|
|
|
for (i = 0; i < 100000; i++) {
|
|
n = random () % 10;
|
|
|
|
if (blocks[n]) {
|
|
newsize = random () % 20;
|
|
if ((newsize & 1) == 0)
|
|
newsize = 0;
|
|
|
|
if (0)
|
|
printf ("adjust %d %x %d\n",
|
|
n, blocks[n], newsize);
|
|
mem_adjust (blocks[n], newsize, NULL);
|
|
if (newsize == 0)
|
|
blocks[n] = NULL;
|
|
} else {
|
|
while ((newsize = random () % 20) == 0)
|
|
;
|
|
if (0)
|
|
printf ("alloc %d %d\n", n, newsize);
|
|
blocks[n] = mem_alloc (newsize, NULL);
|
|
}
|
|
if (mem_check () < 0) {
|
|
printf ("==== %d\n", i);
|
|
mem_print ();
|
|
}
|
|
}
|
|
|
|
mem_print ();
|
|
}
|
|
#endif /* MEM_TEST */
|