diff options
Diffstat (limited to 'arch/arm64/include/asm/assembler.h')
| -rw-r--r-- | arch/arm64/include/asm/assembler.h | 24 |
1 files changed, 22 insertions, 2 deletions
diff --git a/arch/arm64/include/asm/assembler.h b/arch/arm64/include/asm/assembler.h index a4bb3f5..f09a5ae 100644 --- a/arch/arm64/include/asm/assembler.h +++ b/arch/arm64/include/asm/assembler.h @@ -216,6 +216,20 @@ lr .req x30 // link register .macro mmid, rd, rn ldr \rd, [\rn, #MM_CONTEXT_ID] .endm +/* + * read_ctr - read CTR_EL0. If the system has mismatched + * cache line sizes, provide the system wide safe value + * from arm64_ftr_reg_ctrel0.sys_val + */ + .macro read_ctr, reg +alternative_if_not ARM64_MISMATCHED_CACHE_LINE_SIZE + mrs \reg, ctr_el0 // read CTR + nop +alternative_else + ldr_l \reg, arm64_ftr_reg_ctrel0 + ARM64_FTR_SYSVAL +alternative_endif + .endm + /* * raw_dcache_line_size - get the minimum D-cache line size on this CPU @@ -232,7 +246,10 @@ lr .req x30 // link register * dcache_line_size - get the safe D-cache line size across all CPUs */ .macro dcache_line_size, reg, tmp - raw_dcache_line_size \reg, \tmp + read_ctr \tmp + ubfm \tmp, \tmp, #16, #19 // cache line size encoding + mov \reg, #4 // bytes per word + lsl \reg, \reg, \tmp // actual cache line size .endm /* @@ -250,7 +267,10 @@ lr .req x30 // link register * icache_line_size - get the safe I-cache line size across all CPUs */ .macro icache_line_size, reg, tmp - raw_icache_line_size \reg, \tmp + read_ctr \tmp + and \tmp, \tmp, #0xf // cache line size encoding + mov \reg, #4 // bytes per word + lsl \reg, \reg, \tmp // actual cache line size .endm /* |
