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| author | Nicolas Pitre <nicolas.pitre@linaro.org> | 2011-09-16 09:14:23 +0400 |
|---|---|---|
| committer | Nicolas Pitre <nico@fluxnic.net> | 2011-11-27 04:21:28 +0400 |
| commit | 576d2f2525612ecb5af029a76f21f22a3b82563d (patch) | |
| tree | 81f9564c432ceeb4068dd3a5de204134a32c98f3 /arch/arm/mm/mm.h | |
| parent | 6ee723a6570a897208b76ab3e9a495e9106b2f8c (diff) | |
| download | linux-576d2f2525612ecb5af029a76f21f22a3b82563d.tar.xz | |
ARM: add generic ioremap optimization by reusing static mappings
Now that we have all the static mappings from iotable_init() located
in the vmalloc area, it is trivial to optimize ioremap by reusing those
static mappings when the requested physical area fits in one of them,
and so in a generic way for all platforms.
Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Tested-by: Stephen Warren <swarren@nvidia.com>
Tested-by: Kevin Hilman <khilman@ti.com>
Tested-by: Jamie Iles <jamie@jamieiles.com>
Diffstat (limited to 'arch/arm/mm/mm.h')
| -rw-r--r-- | arch/arm/mm/mm.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/arm/mm/mm.h b/arch/arm/mm/mm.h index ad7cce3bc431..70f6d3ea4834 100644 --- a/arch/arm/mm/mm.h +++ b/arch/arm/mm/mm.h @@ -21,6 +21,20 @@ const struct mem_type *get_mem_type(unsigned int type); extern void __flush_dcache_page(struct address_space *mapping, struct page *page); +/* + * ARM specific vm_struct->flags bits. + */ + +/* (super)section-mapped I/O regions used by ioremap()/iounmap() */ +#define VM_ARM_SECTION_MAPPING 0x80000000 + +/* permanent static mappings from iotable_init() */ +#define VM_ARM_STATIC_MAPPING 0x40000000 + +/* mapping type (attributes) for permanent static mappings */ +#define VM_ARM_MTYPE(mt) ((mt) << 20) +#define VM_ARM_MTYPE_MASK (0x1f << 20) + #endif #ifdef CONFIG_ZONE_DMA |