| Message ID | 20230220111215.27471-2-pierrick.bouvier@linaro.org |
|---|---|
| State | New |
| Headers | show |
| Series | Adds support for running QEMU natively on windows-arm64 | expand |
Reviewed-by: Richard Henderson <richard.henderson@linaro.org> On 2/20/23 12:12, Pierrick Bouvier wrote: > 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> > --- > util/cacheflush.c | 14 +++++++++++--- > 1 file changed, 11 insertions(+), 3 deletions(-) > > diff --git a/util/cacheflush.c b/util/cacheflush.c > index 2c2c73e085..06c2333a60 100644 > --- a/util/cacheflush.c > +++ b/util/cacheflush.c > @@ -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. */
diff --git a/util/cacheflush.c b/util/cacheflush.c index 2c2c73e085..06c2333a60 100644 --- a/util/cacheflush.c +++ b/util/cacheflush.c @@ -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. */
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> --- util/cacheflush.c | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-)