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* implement unmapiodev(), make mapiodev() aware of ppc4xx_tlb_mapiodev()

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* we now don't rely on having console linear-mapped (that was terribly
  broken, really)
* also, this can be used as generic ibm4xx mapiodev()/unmapiodev()

OK by matt@
This commit is contained in:
freza 2006-08-31 22:53:40 +00:00
parent 3a3624455e
commit 8f274ce5a8
1 changed files with 31 additions and 8 deletions
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39
sys/arch/evbppc/evbppc/evbppc_machdep.c
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@ -1,4 +1,4 @@
/* $NetBSD: evbppc_machdep.c,v 1.7 2005/12/11 12:17:12 christos Exp $ */
/* $NetBSD: evbppc_machdep.c,v 1.8 2006/08/31 22:53:40 freza Exp $ */
/*
* Copyright 2001, 2002 Wasabi Systems, Inc.
@ -67,7 +67,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: evbppc_machdep.c,v 1.7 2005/12/11 12:17:12 christos Exp $");
__KERNEL_RCSID(0, "$NetBSD: evbppc_machdep.c,v 1.8 2006/08/31 22:53:40 freza Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -83,21 +83,30 @@ __KERNEL_RCSID(0, "$NetBSD: evbppc_machdep.c,v 1.7 2005/12/11 12:17:12 christos
int fake_mapiodev = 1;
/*
* Allocate vm space and mapin the I/O address
* mapiodev:
*
* Allocate vm space and mapin the I/O address. Use reserved TLB
* mapping if one is found.
*/
void *
mapiodev(paddr_t pa, psize_t len)
{
void *p;
paddr_t faddr;
vaddr_t taddr, va;
int off;
/*
* Initially we cannot use uvm_ functions, but we still have to map
* console..
/*
* See if we have reserved TLB entry for the pa. This needs to be
* true for console as we can't use uvm during early bootstrap.
*/
if (fake_mapiodev)
return (void *)(intptr_t)pa;
p = ppc4xx_tlb_mapiodev(pa, len);
if (p != NULL)
return (p);
if (fake_mapiodev)
panic("mapiodev: no TLB entry reserved for %llx+%llx",
(long long)pa, (long long)len);
faddr = trunc_page(pa);
off = pa - faddr;
@ -116,3 +125,17 @@ mapiodev(paddr_t pa, psize_t len)
pmap_update(pmap_kernel());
return (void *)(va + off);
}
void
unmapiodev(vaddr_t va, vsize_t sz)
{
/* Nothing to do for reserved (ie. not uvm_km_alloc'd) mappings. */
if (va < VM_MIN_KERNEL_ADDRESS || va > VM_MAX_KERNEL_ADDRESS)
return;
sz = round_page((va & PAGE_MASK) + sz);
va = trunc_page(va);
pmap_kremove(va, sz);
uvm_km_free(kernel_map, va, sz, UVM_KMF_VAONLY);
}