Adding upstream version 0.0~git20221206.8b7148f.upstream/0.0_git20221206.8b7148f

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 50 insertions, 0 deletions

diff --git a/libc-top-half/musl/src/linux/cache.c b/libc-top-half/musl/src/linux/cache.c
new file mode 100644
index 0000000..0eb051c
--- /dev/null
+++ b/libc-top-half/musl/src/linux/cache.c
@@ -0,0 +1,50 @@
+#include <errno.h>
+#include "syscall.h"
+#include "atomic.h"
+
+#ifdef SYS_cacheflush
+int _flush_cache(void *addr, int len, int op)
+{
+	return syscall(SYS_cacheflush, addr, len, op);
+}
+weak_alias(_flush_cache, cacheflush);
+#endif
+
+#ifdef SYS_cachectl
+int __cachectl(void *addr, int len, int op)
+{
+	return syscall(SYS_cachectl, addr, len, op);
+}
+weak_alias(__cachectl, cachectl);
+#endif
+
+#ifdef SYS_riscv_flush_icache
+
+#define VDSO_FLUSH_ICACHE_SYM "__vdso_flush_icache"
+#define VDSO_FLUSH_ICACHE_VER "LINUX_4.5"
+
+static void *volatile vdso_func;
+
+static int flush_icache_init(void *start, void *end, unsigned long int flags)
+{
+	void *p = __vdsosym(VDSO_FLUSH_ICACHE_VER, VDSO_FLUSH_ICACHE_SYM);
+	int (*f)(void *, void *, unsigned long int) =
+		(int (*)(void *, void *, unsigned long int))p;
+	a_cas_p(&vdso_func, (void *)flush_icache_init, p);
+	return f ? f(start, end, flags) : -ENOSYS;
+}
+
+static void *volatile vdso_func = (void *)flush_icache_init;
+
+int __riscv_flush_icache(void *start, void *end, unsigned long int flags) 
+{
+	int (*f)(void *, void *, unsigned long int) =
+		(int (*)(void *, void *, unsigned long int))vdso_func;
+	if (f) {
+		int r = f(start, end, flags);
+		if (!r) return r;
+		if (r != -ENOSYS) return __syscall_ret(r);
+	}
+}
+weak_alias(__riscv_flush_icache, riscv_flush_icache);
+#endif