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/*-
* Copyright (C) 1999 Egbert Eich
*
* Permission to use, copy, modify, distribute, and sell this software and
* its documentation for any purpose is hereby granted without fee,
* provided that the above copyright notice appear in all copies and that
* both that copyright notice and this permission notice appear in
* supporting documentation, and that the name of the authors not be used
* in advertising or publicity pertaining to distribution of the software
* without specific, written prior permission. The authors makes no
* representations about the suitability of this software for any purpose.
* It is provided "as is" without express or implied warranty.
*
* THE AUTHORS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL THE AUTHORS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
* USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*
* xserver/hw/xfree86/int10/generic.c
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <compat/x86bios/x86bios.h>
extern u_char *pbiosMem;
extern int busySegMap[5];
void *
x86biosAlloc(int count, int *segs)
{
int i;
int j;
/* find the free segblock of page */
for (i = 0; i < (PAGE_RESERV - count); i++)
{
if (busySegMap[i] == 0)
{
/* find the capacity of segblock */
for (j = i; j < (i + count); j++)
{
if (busySegMap[j] == 1)
break;
}
if (j == (i + count))
break;
i += count;
}
}
if (i == (PAGE_RESERV - count))
return NULL;
/* make the segblock is used */
for (j = i; j < (i + count); j++)
busySegMap[i] = 1;
*segs = i * 4096;
return (pbiosMem + *segs);
}
void
x86biosFree(void *pbuf, int count)
{
int i;
int busySeg;
busySeg = ((u_char *)pbuf - pbiosMem) / 4096;
for (i = busySeg; i < (busySeg + count); i++)
busySegMap[i] = 0;
}
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