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/* $OpenBSD: aperture.c,v 1.5 2000/03/02 01:49:09 todd Exp $ */
/*
* Copyright 1994 the XFree86 Project Inc.
*/
/*
* linear framebuffer aperture driver for OpenBSD
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/errno.h>
#define VGA_START 0xA0000
#ifdef PC98
#define VGA_END 0xFFFFF
#define HOLE16M_START 0xF00000
#define HOLE16M_END 0xFFFFFF
#else
#define VGA_END 0xBFFFF
#endif
/* open counter */
static int ap_open_count = 0;
/*
* Open the device
*/
int
apopen(dev_t dev, int oflags, int devtype, struct proc *p)
{
if (suser(p->p_ucred, &p->p_acflag) != 0) {
return(EPERM);
}
/* authorize only one simultaneous open() */
if (ap_open_count > 0) {
return(EPERM);
}
ap_open_count++;
return(0);
}
/*
* Close the device
*/
int
apclose(dev_t dev, int cflags, int devtype, struct proc *p)
{
ap_open_count--;
return(0);
}
/*
* mmap() physical memory sections
*
* allow only section in the vga framebuffer and above main memory
* to be mapped
*/
int
apmmap(dev_t dev, int offset, int length)
{
#ifdef AP_DEBUG
printf("apmmap: addr 0x%x\n", offset);
#endif
if ((minor(dev) == 0)
&& ((offset >= VGA_START && offset <= VGA_END )
|| (unsigned)offset > (unsigned)ctob(physmem)
#ifdef PC98
|| ((unsigned)offset >=HOLE16M_START
&& (unsigned)offset <= HOLE16M_END)
#endif
)) {
return i386_btop(offset);
} else {
return(-1);
}
}
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