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| author | Alan Cox <alc@FreeBSD.org> | 2012-06-16 18:56:19 +0000 |
|---|---|---|
| committer | Alan Cox <alc@FreeBSD.org> | 2012-06-16 18:56:19 +0000 |
| commit | 6031c68de4bcae8f608916a7df5885c9b9942d34 (patch) | |
| tree | ebf0376a21131a0f41835773afe0ddda56d3efbe /sys/ia64 | |
| parent | bc5116ba42aea2291f3c70ba46aba6ac677e997f (diff) | |
| download | src-6031c68de4bcae8f608916a7df5885c9b9942d34.tar.gz src-6031c68de4bcae8f608916a7df5885c9b9942d34.zip | |
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
Notes
Notes:
svn path=/head/; revision=237168
Diffstat (limited to 'sys/ia64')
| -rw-r--r-- | sys/ia64/include/pmap.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/sys/ia64/include/pmap.h b/sys/ia64/include/pmap.h index 2b89df0e2504..3c4539f6d143 100644 --- a/sys/ia64/include/pmap.h +++ b/sys/ia64/include/pmap.h @@ -118,6 +118,7 @@ extern int pmap_vhpt_log2size; #define pmap_page_get_memattr(m) ((m)->md.memattr) #define pmap_page_is_mapped(m) (!TAILQ_EMPTY(&(m)->md.pv_list)) +#define pmap_page_is_write_mapped(m) (((m)->aflags & PGA_WRITEABLE) != 0) #define pmap_mapbios(pa, sz) pmap_mapdev(pa, sz) #define pmap_unmapbios(va, sz) pmap_unmapdev(va, sz) |