diff options
| author | Becky Bruce <beckyb@kernel.crashing.org> | 2009-08-24 10:15:36 +0400 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2009-08-28 08:24:12 +0400 |
| commit | e3e1d15855206c85f4c9ed82746e81acfe13e5aa (patch) | |
| tree | a44794ac7c0e2ed11b805c61be0ff86c1d60b40c | |
| parent | 948c28fe3001f2c9d852dff2a0b2c69fe7cec91b (diff) | |
| download | linux-e3e1d15855206c85f4c9ed82746e81acfe13e5aa.tar.xz | |
powerpc: Name xpn & x fields in HW Hash PTE format
Previously, the 36-bit code was using these bits, but they had
never been named in the pte format definition. This patch just
gives those fields their proper names and adds a comment that
they are only present on some processors.
There is no functional code change.
Signed-off-by: Becky Bruce <beckyb@kernel.crashing.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
| -rw-r--r-- | arch/powerpc/include/asm/mmu-hash32.h | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/arch/powerpc/include/asm/mmu-hash32.h b/arch/powerpc/include/asm/mmu-hash32.h index 382fc689f204..16f513e5cbd7 100644 --- a/arch/powerpc/include/asm/mmu-hash32.h +++ b/arch/powerpc/include/asm/mmu-hash32.h @@ -55,21 +55,25 @@ struct ppc_bat { #ifndef __ASSEMBLY__ -/* Hardware Page Table Entry */ +/* + * Hardware Page Table Entry + * Note that the xpn and x bitfields are used only by processors that + * support extended addressing; otherwise, those bits are reserved. + */ struct hash_pte { unsigned long v:1; /* Entry is valid */ unsigned long vsid:24; /* Virtual segment identifier */ unsigned long h:1; /* Hash algorithm indicator */ unsigned long api:6; /* Abbreviated page index */ unsigned long rpn:20; /* Real (physical) page number */ - unsigned long :3; /* Unused */ + unsigned long xpn:3; /* Real page number bits 0-2, optional */ unsigned long r:1; /* Referenced */ unsigned long c:1; /* Changed */ unsigned long w:1; /* Write-thru cache mode */ unsigned long i:1; /* Cache inhibited */ unsigned long m:1; /* Memory coherence */ unsigned long g:1; /* Guarded */ - unsigned long :1; /* Unused */ + unsigned long x:1; /* Real page number bit 3, optional */ unsigned long pp:2; /* Page protection */ }; |