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arm64: handle non-cacheable normal memory 

Non-cacheable normal memory is needed when one wants an easy way
to have a DMA region. That way all the reads and writes will be
picked up by the CPU and the device without any cache management
operations.

BUG=chrome-os-partner:31293
BRANCH=None
TEST=With a bevy of other patches can use a carved out DMA region
     for talking to USB.

Change-Id: I8172f4b7510dee250aa561d040b27af3080764d7
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: a5bc7ab1709edd97d8795aa9687e6a0edf26ffc6
Original-Change-Id: I36b7fc276467fe3e9cec4d602652d6fa8098c133
Original-Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/212160
Original-Reviewed-by: Furquan Shaikh <furquan@chromium.org>
Original-Commit-Queue: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: http://review.coreboot.org/8924
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
This commit is contained in:
Aaron Durbin 2014-08-12 17:40:38 -05:00 committed by Patrick Georgi
parent 4185f9b9f2
commit 4633dc1887
2 changed files with 13 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
src/arch/arm64/armv8/mmu.c
View File

@ -67,8 +67,16 @@ static uint64_t get_block_attr(unsigned long tag)
attr = (tag & MA_NS)? BLOCK_NS : 0; attr = (tag & MA_NS)? BLOCK_NS : 0;
attr |= (tag & MA_RO)? BLOCK_AP_RO : BLOCK_AP_RW; attr |= (tag & MA_RO)? BLOCK_AP_RO : BLOCK_AP_RW;
attr |= BLOCK_ACCESS; attr |= BLOCK_ACCESS;
attr |= (tag & MA_MEM)? (BLOCK_INDEX_MEM_NORMAL << BLOCK_INDEX_SHIFT) :
(BLOCK_INDEX_MEM_DEV_NGNRNE << BLOCK_INDEX_SHIFT); if (tag & MA_MEM) {
if (tag & MA_MEM_NC)
attr |= BLOCK_INDEX_MEM_NORMAL_NC << BLOCK_INDEX_SHIFT;
else
attr |= BLOCK_INDEX_MEM_NORMAL << BLOCK_INDEX_SHIFT;
} else {
attr |= BLOCK_INDEX_MEM_DEV_NGNRNE << BLOCK_INDEX_SHIFT;
}
return attr; return attr;
} }

3
src/arch/arm64/include/armv8/arch/mmu.h
View File

@ -47,6 +47,9 @@
#define MA_RO (1 << 2) #define MA_RO (1 << 2)
#define MA_RW (0 << 2) #define MA_RW (0 << 2)
/* Non-cacheable memory. */
#define MA_MEM_NC (1 << 3)
/* Descriptor attributes */ /* Descriptor attributes */
#define INVALID_DESC 0x0 #define INVALID_DESC 0x0