xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

x86, pat: New i/f for driver to request memtype for IO regions

Browse Source 
Add new routines to request memtype for IO regions. This will currently
be a backend for io_mapping_* routines. But, it can also be made available
to drivers directly in future, in case it is needed.

reserve interface reserves the memory, makes sure we have a compatible
memory type available and keeps the identity map in sync when needed.

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
Venkatesh Pallipadi
2009-07-10 09:57:34 -07:00
committed by H. Peter Anvin
parent 279e669b3f
commit 9fd126bc74
2 changed files with 54 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
arch/x86/include/asm/pat.h
View File

@@ -19,4 +19,9 @@ extern int free_memtype(u64 start, u64 end);
extern int kernel_map_sync_memtype(u64 base, unsigned long size,
unsigned long flag);
int io_reserve_memtype(resource_size_t start, resource_size_t end,
unsigned long *type);
void io_free_memtype(resource_size_t start, resource_size_t end);
#endif /* _ASM_X86_PAT_H */