svn commit: r246597 - projects/amd64_xen_pv/sys/amd64/xen
Cherry G. Mathew
cherry at FreeBSD.org
Sat Feb 9 17:34:49 UTC 2013
Author: cherry
Date: Sat Feb 9 17:34:48 2013
New Revision: 246597
URL: http://svnweb.freebsd.org/changeset/base/246597
Log:
Remove unnecessary sign extension (48bit upward) masking on va.
This is relevant only for the pml4t offset calculation.
Approved by: gibbs (implicit)
Modified:
projects/amd64_xen_pv/sys/amd64/xen/mmu_map.c
Modified: projects/amd64_xen_pv/sys/amd64/xen/mmu_map.c
==============================================================================
--- projects/amd64_xen_pv/sys/amd64/xen/mmu_map.c Sat Feb 9 17:32:00 2013 (r246596)
+++ projects/amd64_xen_pv/sys/amd64/xen/mmu_map.c Sat Feb 9 17:34:48 2013 (r246597)
@@ -71,20 +71,12 @@ pml4t_index(uintptr_t va)
static int
pdpt_index(uintptr_t va)
{
- /* amd64 sign extends 48th bit and upwards */
- const uint64_t SIGNMASK = (1UL << 48) - 1;
- va &= SIGNMASK; /* Remove sign extension */
-
return ((va & PML4MASK) >> PDPSHIFT);
}
static int
pdt_index(uintptr_t va)
{
- /* amd64 sign extends 48th bit and upwards */
- const uint64_t SIGNMASK = (1UL << 48) - 1;
- va &= SIGNMASK; /* Remove sign extension */
-
return ((va & PDPMASK) >> PDRSHIFT);
}
@@ -92,10 +84,6 @@ pdt_index(uintptr_t va)
static int
pt_index(uintptr_t va)
{
- /* amd64 sign extends 48th bit and upwards */
- const uint64_t SIGNMASK = (1UL << 48) - 1;
- va &= SIGNMASK; /* Remove sign extension */
-
return ((va & PDRMASK) >> PAGE_SHIFT);
}
#endif
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