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| author | alc <alc@FreeBSD.org> | 2003-09-08 02:45:03 +0000 |
|---|---|---|
| committer | alc <alc@FreeBSD.org> | 2003-09-08 02:45:03 +0000 |
| commit | a81d9ad0b98e80387ddd4e42ca6d4d3a2e30c1ec (patch) | |
| tree | b2790809d73f520fb71ebb6aa2acc4efb7933854 /sys/vm/pmap.h | |
| parent | ce0ede96f1c4135dba204423dccf8e16f7dc1dbd (diff) | |
| download | FreeBSD-src-a81d9ad0b98e80387ddd4e42ca6d4d3a2e30c1ec.zip FreeBSD-src-a81d9ad0b98e80387ddd4e42ca6d4d3a2e30c1ec.tar.gz | |
Introduce a new pmap function, pmap_extract_and_hold(). This function
atomically extracts and holds the physical page that is associated with the
given pmap and virtual address. Such a function is needed to make the
memory mapping optimizations used by, for example, pipes and raw disk I/O
MP-safe.
Reviewed by: tegge
Diffstat (limited to 'sys/vm/pmap.h')
| -rw-r--r-- | sys/vm/pmap.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/sys/vm/pmap.h b/sys/vm/pmap.h index af809bb..29f20c2 100644 --- a/sys/vm/pmap.h +++ b/sys/vm/pmap.h @@ -106,6 +106,7 @@ void pmap_enter(pmap_t, vm_offset_t, vm_page_t, vm_prot_t, vm_page_t pmap_enter_quick(pmap_t pmap, vm_offset_t va, vm_page_t m, vm_page_t mpte); vm_paddr_t pmap_extract(pmap_t pmap, vm_offset_t va); +vm_page_t pmap_extract_and_hold(pmap_t pmap, vm_offset_t va); void pmap_growkernel(vm_offset_t); void pmap_init(vm_paddr_t, vm_paddr_t); boolean_t pmap_is_modified(vm_page_t m); |
