From 62a09ad53b7cb18bb47dc3c77155f56b894a6df5 Mon Sep 17 00:00:00 2001 From: Lukas Auer Date: Thu, 22 Nov 2018 11:26:23 +0100 Subject: [PATCH] riscv: implement the invalidate_icache_* functions Implement the functions invalidate_icache_range() and invalidate_icache_all(). RISC-V does not have instructions for explicit cache-control. The functions in this patch are implemented with the memory ordering instruction for synchronizing the instruction and data streams. This may be implemented as a cache flush or invalidate on simple processors, others may only invalidate the relevant cache lines. Signed-off-by: Lukas Auer Reviewed-by: Bin Meng Reviewed-by: Rick Chen --- arch/riscv/lib/cache.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/arch/riscv/lib/cache.c b/arch/riscv/lib/cache.c index 1d67c49c2c..d642a38a07 100644 --- a/arch/riscv/lib/cache.c +++ b/arch/riscv/lib/cache.c @@ -12,6 +12,16 @@ void flush_dcache_range(unsigned long start, unsigned long end) void invalidate_icache_range(unsigned long start, unsigned long end) { + /* + * RISC-V does not have an instruction for invalidating parts of the + * instruction cache. Invalidate all of it instead. + */ + invalidate_icache_all(); +} + +void invalidate_icache_all(void) +{ + asm volatile ("fence.i" ::: "memory"); } void invalidate_dcache_range(unsigned long start, unsigned long end)