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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/vm/pmap.h | |
| 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/vm/pmap.h')
| -rw-r--r-- | sys/vm/pmap.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/sys/vm/pmap.h b/sys/vm/pmap.h index a4f1e70..d06c22b 100644 --- a/sys/vm/pmap.h +++ b/sys/vm/pmap.h @@ -80,10 +80,11 @@ struct pmap_statistics { typedef struct pmap_statistics *pmap_statistics_t; /* - * Each machine dependent implementation is expected to provide: + * Each machine-dependent implementation is required to provide: * * vm_memattr_t pmap_page_get_memattr(vm_page_t); * boolean_t pmap_page_is_mapped(vm_page_t); + * boolean_t pmap_page_is_write_mapped(vm_page_t); * void pmap_page_set_memattr(vm_page_t, vm_memattr_t); */ #include <machine/pmap.h> |
