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| author | Christophe Leroy <christophe.leroy@c-s.fr> | 2018-01-12 13:45:29 +0100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-01-16 13:47:14 +0100 |
| commit | 351750331fc1580cdb60d2efef04238f5faa89fe (patch) | |
| tree | fab5ee5e236ff91fd63640f27f142bee3b691cbb /arch/powerpc/include/asm/pte-common.h | |
| parent | powerpc/mm: extend _PAGE_PRIVILEGED to all CPUs (diff) | |
| download | linux-351750331fc1580cdb60d2efef04238f5faa89fe.tar.xz linux-351750331fc1580cdb60d2efef04238f5faa89fe.zip | |
powerpc/mm: Introduce _PAGE_NA
Today, PAGE_NONE is defined as a page not having _PAGE_USER.
In some circunstances, when the CPU supports it, it might be
better to be able to flag a page with NO ACCESS.
In a following patch, the 8xx will switch user access being flagged
in the PMD, therefore it will not be possible anymore to use
_PAGE_USER as a way to flag a page with no access.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/include/asm/pte-common.h')
| -rw-r--r-- | arch/powerpc/include/asm/pte-common.h | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/arch/powerpc/include/asm/pte-common.h b/arch/powerpc/include/asm/pte-common.h index 0e6595a1b9d8..426a902816c5 100644 --- a/arch/powerpc/include/asm/pte-common.h +++ b/arch/powerpc/include/asm/pte-common.h @@ -50,6 +50,9 @@ #define _PAGE_USER 0 #endif #endif +#ifndef _PAGE_NA +#define _PAGE_NA 0 +#endif #ifndef _PMD_PRESENT_MASK #define _PMD_PRESENT_MASK _PMD_PRESENT @@ -122,7 +125,7 @@ static inline bool pte_user(pte_t pte) /* Mask of bits returned by pte_pgprot() */ #define PAGE_PROT_BITS (_PAGE_GUARDED | _PAGE_COHERENT | _PAGE_NO_CACHE | \ _PAGE_WRITETHRU | _PAGE_ENDIAN | _PAGE_4K_PFN | \ - _PAGE_USER | _PAGE_ACCESSED | _PAGE_RO | \ + _PAGE_USER | _PAGE_ACCESSED | _PAGE_RO | _PAGE_NA | \ _PAGE_PRIVILEGED | \ _PAGE_RW | _PAGE_HWWRITE | _PAGE_DIRTY | _PAGE_EXEC) @@ -150,7 +153,7 @@ static inline bool pte_user(pte_t pte) * * Note due to the way vm flags are laid out, the bits are XWR */ -#define PAGE_NONE __pgprot(_PAGE_BASE) +#define PAGE_NONE __pgprot(_PAGE_BASE | _PAGE_NA) #define PAGE_SHARED __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW) #define PAGE_SHARED_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW | \ _PAGE_EXEC) |