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arm64: Relax the kernel cache requirements for boot

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With system caches for the host OS or architected caches for guest OS we
cannot easily guarantee that there are no dirty or stale cache lines for
the areas of memory written by the kernel during boot with the MMU off
(therefore non-cacheable accesses).

This patch adds the necessary cache maintenance during boot and relaxes
the booting requirements.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Catalin Marinas
2014-03-26 18:25:55 +00:00
parent 35a8697692
commit c218bca74e
3 changed files with 45 additions and 4 deletions
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9
arch/arm64/mm/cache.S
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@@ -167,6 +167,14 @@ ENTRY(__flush_dcache_area)
ret
ENDPROC(__flush_dcache_area)
/*
* __inval_cache_range(start, end)
* - start - start address of region
* - end - end address of region
*/
ENTRY(__inval_cache_range)
/* FALLTHROUGH */
/*
* __dma_inv_range(start, end)
* - start - virtual start address of region
@@ -183,6 +191,7 @@ __dma_inv_range:
b.lo 1b
dsb sy
ret
ENDPROC(__inval_cache_range)
ENDPROC(__dma_inv_range)
/*