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Fix another bug involving /dev/mem and the OEA64 scratchpage. When

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the scratchpage is updated, the PVO's physical address is updated as well.
This makes pmap_extract() begin returning non-zero values again, causing
the panic partially fixed in r204297. Fix this by excluding addresses
beyond virtual_end from consideration as KVA addresses, instead of allowing
addresses up to VM_MAX_KERNEL_ADDRESS.
This commit is contained in:
Nathan Whitehorn 2010-02-25 14:51:06 +00:00
parent 9fd69f37d2
commit f4a943617a
1 changed files with 2 additions and 4 deletions
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6
sys/powerpc/powerpc/mem.c
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@ -121,8 +121,7 @@ kmem_direct_mapped: v = uio->uio_offset;
else if (dev2unit(dev) == CDEV_MINOR_KMEM) {
va = uio->uio_offset;
if ((va < VM_MIN_KERNEL_ADDRESS)
|| (va > VM_MAX_KERNEL_ADDRESS))
if ((va < VM_MIN_KERNEL_ADDRESS) || (va > virtual_end))
goto kmem_direct_mapped;
va = trunc_page(uio->uio_offset);
@ -135,8 +134,7 @@ kmem_direct_mapped: v = uio->uio_offset;
*/
for (; va < eva; va += PAGE_SIZE)
if (pmap_extract(kernel_pmap, va)
== 0)
if (pmap_extract(kernel_pmap, va) == 0)
return (EFAULT);
prot = (uio->uio_rw == UIO_READ)