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allow mmaping of /dev/mem and /dev/kmem. The former for folks with 

buff vid boards which map at high physical addrs, the latter for fun,
since it's possible.
This commit is contained in:
cgd 1994-03-23 05:09:45 +00:00
parent e1b5312609
commit feacc618e1
1 changed files with 8 additions and 8 deletions
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16
sys/arch/i386/i386/mem.c
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@ -38,7 +38,7 @@
* *
* from: Utah Hdr: mem.c 1.13 89/10/08 * from: Utah Hdr: mem.c 1.13 89/10/08
* from: @(#)mem.c 7.2 (Berkeley) 5/9/91 * from: @(#)mem.c 7.2 (Berkeley) 5/9/91
* $Id: mem.c,v 1.11 1994/03/18 19:08:28 mycroft Exp $ * $Id: mem.c,v 1.12 1994/03/23 05:09:45 cgd Exp $
*/ */
/* /*
@ -235,24 +235,24 @@ mmmmap(dev, offset)
dev_t dev; dev_t dev;
int offset; int offset;
{ {
struct proc *p = curproc; /* XXX */
struct pcred *pc = p->p_cred;
#ifdef notyet
switch (minor(dev)) { switch (minor(dev)) {
/* minor device 0 is physical memory */ /* minor device 0 is physical memory */
case 0: case 0:
if (offset > ctob(physmem)) if (offset > ctob(physmem) &&
suser(pc->pc_ucred, &p->p_acflag) != 0)
return -1; return -1;
return i386_btop(offset); return i386_btop(offset);
/* minor device 1 is kernel memory */ /* minor device 1 is kernel memory */
case 1: case 1:
/* kernacc() doesn't check executable permissions. */ /* XXX - writability, executability checks? */
if (!kerncheckprot((caddr_t)offset, NBPG, nprot)) if (!kernacc((caddr_t)offset, NBPG, B_READ))
return -1; return -1;
return i386_btop(vtophys(offset)); return i386_btop(vtophys(offset));
default: default:
return -1; return -1;
} }
#else
return -1;
#endif
} }