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| author | Sascha Hauer <s.hauer@pengutronix.de> | 2011-07-29 11:20:11 +0200 |
|---|---|---|
| committer | Sascha Hauer <s.hauer@pengutronix.de> | 2011-08-03 09:11:10 +0200 |
| commit | 3100ea14668853aeedae85ec83e3536b59ba7728 (patch) | |
| tree | 0fa218f88a470a9948eec79aa9aa0d65017d5c16 /include/common.h | |
| parent | f9f35ee93821048bbace895c5c688bafbda2c3f3 (diff) | |
| download | barebox-3100ea14668853aeedae85ec83e3536b59ba7728.tar.gz barebox-3100ea14668853aeedae85ec83e3536b59ba7728.tar.xz | |
ARM: rework MMU support
In barebox we used 1MiB sections to map our SDRAM cachable. This
has the drawback that we have to map our sdram twice: cached for
normal sdram and uncached for DMA operations. As address space gets
sparse on newer systems we are sometines unable to find a suitably
big enough area for the dma coherent space.
This patch changes the MMU code to use second level page tables.
With it we can implement dma_alloc_coherent as normal malloc, we
just have to remap the allocated area uncached afterwards and map
it cached again after free().
This makes arm_create_section(), setup_dma_coherent() and mmu_enable()
noops.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'include/common.h')
| -rw-r--r-- | include/common.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/common.h b/include/common.h index f3353c8643..0ce4a70b56 100644 --- a/include/common.h +++ b/include/common.h @@ -221,6 +221,7 @@ int run_shell(void); #define ULLONG_MAX (~0ULL) #define PAGE_SIZE 4096 +#define PAGE_SHIFT 12 int memory_display(char *addr, ulong offs, ulong nbytes, int size); |