From 351750331fc1580cdb60d2efef04238f5faa89fe Mon Sep 17 00:00:00 2001 From: Christophe Leroy Date: Fri, 12 Jan 2018 13:45:29 +0100 Subject: 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 Signed-off-by: Michael Ellerman --- arch/powerpc/include/asm/pte-common.h | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) (limited to 'arch/powerpc/include/asm/pte-common.h') 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) -- cgit