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ARM: move iotable mappings within the vmalloc region

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In order to remove the build time variation between different SOCs with
regards to VMALLOC_END, the iotable mappings are now allocated inside
the vmalloc region.  This allows for VMALLOC_END to be identical across
all machines.

The value for VMALLOC_END is now set to 0xff000000 which is right where
the consistent DMA area starts.

To accommodate all static mappings on machines with possible highmem usage,
the default vmalloc area size is changed to 240 MB so that VMALLOC_START
is no higher than 0xf0000000 by default.

Signed-off-by: Nicolas Pitre <[email protected]>
Tested-by: Stephen Warren <[email protected]>
Tested-by: Kevin Hilman <[email protected]>
Tested-by: Jamie Iles <[email protected]>
This commit is contained in:
Nicolas Pitre 2011-08-25 00:35:59 -04:00 • committed by Nicolas Pitre
commit 0536bdf33f
3 changed files with 41 additions and 27 deletions
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11
Documentation/arm/memory.txt
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@ -51,15 +51,14 @@ ffc00000 ffefffff DMA memory mapping region. Memory returned
ff000000 ffbfffff Reserved for future expansion of DMA
mapping region.
VMALLOC_END feffffff Free for platform use, recommended.
VMALLOC_END must be aligned to a 2MB
boundary.
VMALLOC_START VMALLOC_END-1 vmalloc() / ioremap() space.
Memory returned by vmalloc/ioremap will
be dynamically placed in this region.
VMALLOC_START may be based upon the value
of the high_memory variable.
Machine specific static mappings are also
located here through iotable_init().
VMALLOC_START is based upon the value
of the high_memory variable, and VMALLOC_END
is equal to 0xff000000.
PAGE_OFFSET high_memory-1 Kernel direct-mapped RAM region.
This maps the platforms RAM, and typically