diff options
| author | LEROY Christophe <christophe.leroy@c-s.fr> | 2015-01-19 17:04:38 +0100 |
|---|---|---|
| committer | Scott Wood <scottwood@freescale.com> | 2015-01-29 20:11:51 -0600 |
| commit | a7b9f671f2d141528491c346e21e8a179cee9d21 (patch) | |
| tree | 963edf92d3bc966992c78c4fa94d368003f9b396 /arch/powerpc/include/asm/pgtable.h | |
| parent | d2caa3cebda8b626336e100b80a0ed6f909dccab (diff) | |
powerpc32: adds handling of _PAGE_RO
Some powerpc like the 8xx don't have a RW bit in PTE bits but a RO
(Read Only) bit. This patch implements the handling of a _PAGE_RO flag
to be used in place of _PAGE_RW
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
[scottwood@freescale.com: fix whitespace]
Signed-off-by: Scott Wood <scottwood@freescale.com>
Diffstat (limited to 'arch/powerpc/include/asm/pgtable.h')
| -rw-r--r-- | arch/powerpc/include/asm/pgtable.h | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/arch/powerpc/include/asm/pgtable.h b/arch/powerpc/include/asm/pgtable.h index a8805fee0df9..7e77f2ca5132 100644 --- a/arch/powerpc/include/asm/pgtable.h +++ b/arch/powerpc/include/asm/pgtable.h @@ -30,7 +30,8 @@ struct mm_struct; #include <asm/tlbflush.h> /* Generic accessors to PTE bits */ -static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_RW; } +static inline int pte_write(pte_t pte) +{ return (pte_val(pte) & (_PAGE_RW | _PAGE_RO)) != _PAGE_RO; } static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; } static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; } @@ -115,12 +116,14 @@ static inline unsigned long pte_pfn(pte_t pte) { /* Generic modifiers for PTE bits */ static inline pte_t pte_wrprotect(pte_t pte) { - pte_val(pte) &= ~(_PAGE_RW | _PAGE_HWWRITE); return pte; } + pte_val(pte) &= ~(_PAGE_RW | _PAGE_HWWRITE); + pte_val(pte) |= _PAGE_RO; return pte; } static inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~(_PAGE_DIRTY | _PAGE_HWWRITE); return pte; } static inline pte_t pte_mkold(pte_t pte) { pte_val(pte) &= ~_PAGE_ACCESSED; return pte; } static inline pte_t pte_mkwrite(pte_t pte) { + pte_val(pte) &= ~_PAGE_RO; pte_val(pte) |= _PAGE_RW; return pte; } static inline pte_t pte_mkdirty(pte_t pte) { pte_val(pte) |= _PAGE_DIRTY; return pte; } |