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arm64: Fix memblock current_limit with 64K pages and 48-bit VA 

With 48-bit VA space, the 64K page configuration uses 3 levels instead
of 2 and PUD_SIZE != PMD_SIZE. Since with 64K pages we only cover
PMD_SIZE with the initial swapper_pg_dir populated in head.S, the
memblock current_limit needs to be set accordingly in map_mem() to avoid
allocating unmapped memory. The memblock current_limit is progressively
increased as more blocks are mapped.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Catalin Marinas 2014-10-24 18:16:47 +01:00
parent 92980405f3
commit 3dec0fe48a
1 changed files with 8 additions and 4 deletions
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12
arch/arm64/mm/mmu.c
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@ -297,11 +297,15 @@ static void __init map_mem(void)
* create_mapping requires puds, pmds and ptes to be allocated from
* memory addressable from the initial direct kernel mapping.
*
* The initial direct kernel mapping, located at swapper_pg_dir,
* gives us PUD_SIZE memory starting from PHYS_OFFSET (which must be
* aligned to 2MB as per Documentation/arm64/booting.txt).
* The initial direct kernel mapping, located at swapper_pg_dir, gives
* us PUD_SIZE (4K pages) or PMD_SIZE (64K pages) memory starting from
* PHYS_OFFSET (which must be aligned to 2MB as per
* Documentation/arm64/booting.txt).
*/
limit = PHYS_OFFSET + PUD_SIZE;
if (IS_ENABLED(CONFIG_ARM64_64K_PAGES))
limit = PHYS_OFFSET + PMD_SIZE;
else
limit = PHYS_OFFSET + PUD_SIZE;
memblock_set_current_limit(limit);
/* map all the memory banks */