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| author | alc <alc@FreeBSD.org> | 2012-06-16 18:56:19 +0000 |
|---|---|---|
| committer | alc <alc@FreeBSD.org> | 2012-06-16 18:56:19 +0000 |
| commit | 6eeaee04e4175a3faa0ce3f7778a3abce0d8d9a2 (patch) | |
| tree | ebf0376a21131a0f41835773afe0ddda56d3efbe /sys/powerpc/include | |
| parent | ca31dfb2b475f8026e45a8b10673993068ebc000 (diff) | |
| download | FreeBSD-src-6eeaee04e4175a3faa0ce3f7778a3abce0d8d9a2.zip FreeBSD-src-6eeaee04e4175a3faa0ce3f7778a3abce0d8d9a2.tar.gz | |
The page flag PGA_WRITEABLE is set and cleared exclusively by the pmap
layer, but it is read directly by the MI VM layer. This change introduces
pmap_page_is_write_mapped() in order to completely encapsulate all direct
access to PGA_WRITEABLE in the pmap layer.
Aesthetics aside, I am making this change because amd64 will likely begin
using an alternative method to track write mappings, and having
pmap_page_is_write_mapped() in place allows me to make such a change
without further modification to the MI VM layer.
As an added bonus, tidy up some nearby comments concerning page flags.
Reviewed by: kib
MFC after: 6 weeks
Diffstat (limited to 'sys/powerpc/include')
| -rw-r--r-- | sys/powerpc/include/pmap.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/sys/powerpc/include/pmap.h b/sys/powerpc/include/pmap.h index 2f0e5b0..f50ff11 100644 --- a/sys/powerpc/include/pmap.h +++ b/sys/powerpc/include/pmap.h @@ -223,6 +223,8 @@ extern struct pmap kernel_pmap_store; #define PMAP_TRYLOCK(pmap) mtx_trylock(&(pmap)->pm_mtx) #define PMAP_UNLOCK(pmap) mtx_unlock(&(pmap)->pm_mtx) +#define pmap_page_is_write_mapped(m) (((m)->aflags & PGA_WRITEABLE) != 0) + void pmap_bootstrap(vm_offset_t, vm_offset_t); void pmap_kenter(vm_offset_t va, vm_paddr_t pa); void pmap_kenter_attr(vm_offset_t va, vm_offset_t pa, vm_memattr_t); |
