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Cleaned up mmmmap(). No point in trying to support mmap of /dev/kmem since 

physical addresses could be in transit.
This commit is contained in:
mark 1997-07-31 23:02:24 +00:00
parent 658656bb99
commit 4f2ae66cf0
1 changed files with 19 additions and 20 deletions
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37
sys/arch/arm32/arm32/mem.c
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@ -1,4 +1,4 @@
/* $NetBSD: mem.c,v 1.2 1996/03/27 22:42:24 mark Exp $ */
/* $NetBSD: mem.c,v 1.3 1997/07/31 23:02:24 mark Exp $ */
/*
* Copyright (c) 1988 University of Utah.
@ -116,7 +116,7 @@ mmrw(dev, uio, flags)
}
switch (minor(dev)) {
/* minor device 0 is physical memory */
/* minor device 0 is physical memory */
case 0:
v = uio->uio_offset;
pmap_enter(pmap_kernel(), (vm_offset_t)memhook,
@ -129,7 +129,7 @@ mmrw(dev, uio, flags)
(vm_offset_t)memhook + NBPG);
continue;
/* minor device 1 is kernel memory */
/* minor device 1 is kernel memory */
case 1:
v = uio->uio_offset;
c = min(iov->iov_len, MAXPHYS);
@ -139,13 +139,13 @@ mmrw(dev, uio, flags)
error = uiomove((caddr_t)v, c, uio);
continue;
/* minor device 2 is EOF/RATHOLE */
/* minor device 2 is EOF/RATHOLE */
case 2:
if (uio->uio_rw == UIO_WRITE)
uio->uio_resid = 0;
return (0);
/* minor device 3 (/dev/zero) is source of nulls on read, rathole on write */
/* minor device 3 (/dev/zero) is source of nulls on read, rathole on write */
case 3:
if (uio->uio_rw == UIO_WRITE) {
c = iov->iov_len;
@ -186,22 +186,21 @@ mmmmap(dev, off, prot)
{
struct proc *p = curproc; /* XXX */
switch (minor(dev)) {
/* minor device 0 is physical memory */
case 0:
/*
* /dev/mem is the only one that makes sense through this
* interface. For /dev/kmem any physaddr we return here
* could be transient and hence incorrect or invalid at
* a later time. /dev/null just doesn't make any sense
* and /dev/zero is a hack that is handled via the default
* pager in mmap().
*/
if (minor(dev) != 0)
return (-1);
/* minor device 0 is physical memory */
if (off > ctob(physmem) &&
suser(p->p_ucred, &p->p_acflag) != 0)
return -1;
return arm_byte_to_page(off);
/* minor device 1 is kernel memory */
case 1:
/* XXX - writability, executability checks? */
if (!kernacc((caddr_t)off, NBPG, B_READ))
return -1;
return arm_byte_to_page(vtophys(off));
default:
return -1;
}
}