diff options
| author | sigsegv7 <ian@vegaa.systems> | 2023-09-28 15:36:22 -0400 |
|---|---|---|
| committer | sigsegv7 <ian@vegaa.systems> | 2023-09-28 15:36:22 -0400 |
| commit | 215efd60900f28bb543ffab400306fbd01a4f76c (patch) | |
| tree | e0852a5e27249d91b1817dd256445f5a085ed295 | |
| parent | 6acd23f6e758bddc2b204baeafc7885e837f002d (diff) | |
kernel: cdefs: Add memory barrier helper
Signed-off-by: sigsegv7 <ian@vegaa.systems>
| -rw-r--r-- | sys/include/sys/cdefs.h | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/sys/include/sys/cdefs.h b/sys/include/sys/cdefs.h index 56d1f87..bec4431 100644 --- a/sys/include/sys/cdefs.h +++ b/sys/include/sys/cdefs.h @@ -38,6 +38,9 @@ #define __used __attr(used) #define __naked __attr(naked) +/* Wrapper for inline asm */ +#define __ASMV __asm__ __volatile__ + /* Pack a structure */ #define __packed __attribute__((__packed__)) @@ -54,6 +57,12 @@ #define __cacheline_aligned __aligned(64) /* + * Memory barrier, ensure compiler doesn't reorder + * memory accesses. + */ +#define __mem_barrier() __ASMV("" ::: "memory") + +/* * To be used when an empty body is required like: * * #ifdef DEBUG @@ -106,9 +115,6 @@ /* Computes 2^x i.e 2 to the power of 'x' */ #define __POW2(x) (1ULL << x) -/* Wrapper for inline asm */ -#define __ASMV __asm__ __volatile__ - /* * Used to give metadata to * a specific module. Example |