diff options
| author | venkatesh.pallipadi@intel.com <venkatesh.pallipadi@intel.com> | 2008-03-19 01:00:20 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-04-24 23:40:47 +0200 |
| commit | f0970c13b6a5b01189aeb196ebb573cf87d95839 (patch) | |
| tree | c33836b693ca066c19dc8986165aee5849fbcdd9 /include | |
| parent | x86: PAT avoid aliasing in /dev/mem read/write (diff) | |
| download | linux-f0970c13b6a5b01189aeb196ebb573cf87d95839.tar.xz linux-f0970c13b6a5b01189aeb196ebb573cf87d95839.zip | |
x86: PAT phys_mem_access_prot_allowed for dev/mem mmap
Introduce phys_mem_access_prot_allowed(), which checks whether the mapping
is possible, without any conflicts and returns success or failure based on that.
phys_mem_access_prot() by itself does not allow failure case. This ability
to return error is needed for PAT where we may have aliasing conflicts.
x86 setup __HAVE_PHYS_MEM_ACCESS_PROT and move x86 specific code out of
/dev/mem into arch specific area.
Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include')
| -rw-r--r-- | include/asm-x86/pgtable.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/include/asm-x86/pgtable.h b/include/asm-x86/pgtable.h index f1d9f4a03f6f..1902f0aed6c1 100644 --- a/include/asm-x86/pgtable.h +++ b/include/asm-x86/pgtable.h @@ -289,6 +289,15 @@ static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) #define canon_pgprot(p) __pgprot(pgprot_val(p) & __supported_pte_mask) +#ifndef __ASSEMBLY__ +#define __HAVE_PHYS_MEM_ACCESS_PROT +struct file; +pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, + unsigned long size, pgprot_t vma_prot); +int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn, + unsigned long size, pgprot_t *vma_prot); +#endif + #ifdef CONFIG_PARAVIRT #include <asm/paravirt.h> #else /* !CONFIG_PARAVIRT */ |