diff options
| author | Aaron Durbin <adurbin@chromium.org> | 2014-07-17 13:08:06 -0500 |
|---|---|---|
| committer | Marc Jones <marc.jones@se-eng.com> | 2015-03-13 00:02:54 +0100 |
| commit | 01dde90eb9c070018fc11b007159c8d130b2809d (patch) | |
| tree | 4a76a7efc98b6ad469b463091b0bbb53c9b27193 /src/arch | |
| parent | b397f011497e9ea3fa06ed8d3bf29947e55a2677 (diff) | |
armv8: correct dcache line size calculation
The CCSIDR_EL1 register has cache attribute information
for a given cache selection in CSSELR_EL1. However, the
cache isn't being selected before reading CCSIDR_EL1.
Instead use CTR_EL0 which better fits with the semantics
of dcache_line_bytes(). CTR_EL0 has the minimum data cache
line size of all caches in the system encoded in 19:16 encoded
as lg(line size in words).
BUG=None
TEST=Built.
Original-Change-Id: I2cbf888a93031736e668918de928c3a99c26bedd
Original-Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/208720
Original-Reviewed-by: Furquan Shaikh <furquan@chromium.org>
Original-Commit-Queue: Furquan Shaikh <furquan@chromium.org>
(cherry picked from commit 8d5dfba35d74fc4c6ee14365a2e9d9ed9f43115d)
Signed-off-by: Marc Jones <marc.jones@se-eng.com>
Change-Id: I1db47ff5850c276d0246ac67e8b96f7ed19016c0
Reviewed-on: http://review.coreboot.org/8642
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Diffstat (limited to 'src/arch')
| -rw-r--r-- | src/arch/arm64/armv8/cache.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/src/arch/arm64/armv8/cache.c b/src/arch/arm64/armv8/cache.c index 97822ffdbd..c1dba9259a 100644 --- a/src/arch/arm64/armv8/cache.c +++ b/src/arch/arm64/armv8/cache.c @@ -46,16 +46,17 @@ void tlb_invalidate_all(void) unsigned int dcache_line_bytes(void) { - uint32_t ccsidr; + uint32_t ctr_el0; static unsigned int line_bytes = 0; if (line_bytes) return line_bytes; - ccsidr = raw_read_ccsidr_el1(); - /* [2:0] - Indicates (Log2(number of words in cache line)) - 4 */ - line_bytes = 1 << ((ccsidr & 0x7) + 4); /* words per line */ - line_bytes *= sizeof(uint32_t); /* bytes per word */ + ctr_el0 = raw_read_ctr_el0(); + /* [19:16] - Indicates (Log2(number of words in cache line) */ + line_bytes = 1 << ((ctr_el0 >> 16) & 0xf); + /* Bytes in a word (32-bit) */ + line_bytes *= sizeof(uint32_t); return line_bytes; } |