diff options
| author | Aaron Durbin <adurbin@chromium.org> | 2014-08-12 17:40:38 -0500 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2015-03-26 00:27:07 +0100 |
| commit | 4633dc1887057ac0b27502c6c719b332b46eb352 (patch) | |
| tree | a34a85834605684cde26ddf5aff910fe587f37f6 /src/arch/arm64 | |
| parent | 4185f9b9f2b67dc34fb2cd54b0752944cfa1e222 (diff) | |
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>
Diffstat (limited to 'src/arch/arm64')
| -rw-r--r-- | src/arch/arm64/armv8/mmu.c | 12 | ||||
| -rw-r--r-- | src/arch/arm64/include/armv8/arch/mmu.h | 3 |
2 files changed, 13 insertions, 2 deletions
diff --git a/src/arch/arm64/armv8/mmu.c b/src/arch/arm64/armv8/mmu.c index e1f088e102..cba1e4d4eb 100644 --- a/src/arch/arm64/armv8/mmu.c +++ b/src/arch/arm64/armv8/mmu.c @@ -67,8 +67,16 @@ static uint64_t get_block_attr(unsigned long tag) attr = (tag & MA_NS)? BLOCK_NS : 0; attr |= (tag & MA_RO)? BLOCK_AP_RO : BLOCK_AP_RW; 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; } diff --git a/src/arch/arm64/include/armv8/arch/mmu.h b/src/arch/arm64/include/armv8/arch/mmu.h index f5f60a100c..7639bd52a1 100644 --- a/src/arch/arm64/include/armv8/arch/mmu.h +++ b/src/arch/arm64/include/armv8/arch/mmu.h @@ -47,6 +47,9 @@ #define MA_RO (1 << 2) #define MA_RW (0 << 2) +/* Non-cacheable memory. */ +#define MA_MEM_NC (1 << 3) + /* Descriptor attributes */ #define INVALID_DESC 0x0 |