diff options
| author | Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | 2017-03-28 15:21:12 +1100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-03-31 23:09:52 +1100 |
| commit | 6aa59f5162fcca09c7dcc84d64e2ebd1e7449884 (patch) | |
| tree | 24dbc563140706a59e6f4702af671b7e54847d74 /arch/powerpc/include/asm/book3s/64/pgtable.h | |
| parent | 2f18d533757da3899f4bedab0b2c051b080079dc (diff) | |
powerpc/mm: Move hash specific pte bits to be top bits of RPN
We don't support the full 57 bits of physical address and hence can
overload the top bits of RPN as hash specific pte bits.
Add a BUILD_BUG_ON() to enforce the relationship between H_PAGE_F_SECOND
and H_PAGE_F_GIX.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Reviewed-by: Paul Mackerras <paulus@ozlabs.org>
[mpe: Move the BUILD_BUG_ON() into hash_utils_64.c and comment it]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/include/asm/book3s/64/pgtable.h')
| -rw-r--r-- | arch/powerpc/include/asm/book3s/64/pgtable.h | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h index 1f9e9848bbd5..fb72ff6b98e6 100644 --- a/arch/powerpc/include/asm/book3s/64/pgtable.h +++ b/arch/powerpc/include/asm/book3s/64/pgtable.h @@ -36,8 +36,21 @@ #define _RPAGE_RSV2 0x0800000000000000UL #define _RPAGE_RSV3 0x0400000000000000UL #define _RPAGE_RSV4 0x0200000000000000UL + +#define _PAGE_PTE 0x4000000000000000UL /* distinguishes PTEs from pointers */ +#define _PAGE_PRESENT 0x8000000000000000UL /* pte contains a translation */ + +/* + * Top and bottom bits of RPN which can be used by hash + * translation mode, because we expect them to be zero + * otherwise. + */ #define _RPAGE_RPN0 0x01000 #define _RPAGE_RPN1 0x02000 +#define _RPAGE_RPN44 0x0100000000000000UL +#define _RPAGE_RPN43 0x0080000000000000UL +#define _RPAGE_RPN42 0x0040000000000000UL +#define _RPAGE_RPN41 0x0020000000000000UL /* Max physical address bit as per radix table */ #define _RPAGE_PA_MAX 57 @@ -65,9 +78,6 @@ #define _PAGE_SOFT_DIRTY _RPAGE_SW3 /* software: software dirty tracking */ #define _PAGE_SPECIAL _RPAGE_SW2 /* software: special page */ - -#define _PAGE_PTE 0x4000000000000000UL /* distinguishes PTEs from pointers */ -#define _PAGE_PRESENT 0x8000000000000000UL /* pte contains a translation */ /* * Drivers request for cache inhibited pte mapping using _PAGE_NO_CACHE * Instead of fixing all of them, add an alternate define which |