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util/cacheflush: fix cache on windows-arm64

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ctr_el0 access is privileged on this platform and fails as an illegal
instruction.

Windows does not offer a way to flush data cache from userspace, and
only FlushInstructionCache is available in Windows API.

The generic implementation of flush_idcache_range uses,
__builtin___clear_cache, which already use the FlushInstructionCache
function. So we rely on that.

Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20230221153006.20300-2-pierrick.bouvier@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Pierrick Bouvier 2023-02-21 16:30:03 +01:00 committed by Richard Henderson
parent c3bef3b4de
commit b3c3260295
1 changed files with 11 additions and 3 deletions
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14
util/cacheflush.c
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@ -121,8 +121,12 @@ static void sys_cache_info(int *isize, int *dsize)
static bool have_coherent_icache;
#endif
#if defined(__aarch64__) && !defined(CONFIG_DARWIN)
/* Apple does not expose CTR_EL0, so we must use system interfaces. */
#if defined(__aarch64__) && !defined(CONFIG_DARWIN) && !defined(CONFIG_WIN32)
/*
* Apple does not expose CTR_EL0, so we must use system interfaces.
* Windows neither, but we use a generic implementation of flush_idcache_range
* in this case.
*/
static uint64_t save_ctr_el0;
static void arch_cache_info(int *isize, int *dsize)
{
@ -225,7 +229,11 @@ static void __attribute__((constructor)) init_cache_info(void)
/* Caches are coherent and do not require flushing; symbol inline. */
#elif defined(__aarch64__)
#elif defined(__aarch64__) && !defined(CONFIG_WIN32)
/*
* For Windows, we use generic implementation of flush_idcache_range, that
* performs a call to FlushInstructionCache, through __builtin___clear_cache.
*/
#ifdef CONFIG_DARWIN
/* Apple does not expose CTR_EL0, so we must use system interfaces. */