options/glibc: Add __riscv_flush_icache()

options/glibc/generic/sys-cachectl.cpp

@@ -0,0 +1,16 @@
+#include <bits/ensure.h>
+#include <errno.h>
+#include <mlibc/glibc-sysdeps.hpp>
+#include <sys/cachectl.h>
+
+#ifdef __riscv
+int __riscv_flush_icache(void *start, void *end, unsigned long flags) {
+	auto sysdep = MLIBC_CHECK_OR_ENOSYS(mlibc::sys_riscv_flush_icache, -1);
+
+	if(int e = sysdep(start, end, flags); e) {
+		errno = e;
+		return -1;
+	}
+	return 0;
+}
+#endif

options/glibc/include/mlibc/glibc-sysdeps.hpp

@@ -11,6 +11,10 @@ namespace  [[gnu::visibility("hidden")]] mlibc {
 [[gnu::weak]] int sys_ioperm(unsigned long int from, unsigned long int num, int turn_on);
 [[gnu::weak]] int sys_iopl(int level);
 
+#ifdef __riscv
+[[gnu::weak]] int sys_riscv_flush_icache(void *start, void *end, unsigned long flags);
+#endif
+
 } // namespace mlibc
 
 #endif // MLIBC_GLIBC_SYSDEPS

options/glibc/include/sys/cachectl.h

@@ -0,0 +1,16 @@
+#ifndef _SYS_CACHECTL_H
+#define _SYS_CACHECTL_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifdef __riscv
+int __riscv_flush_icache(void *, void *, unsigned long);
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

options/glibc/meson.build

@@ -18,6 +18,7 @@ libc_sources += files(
 	'generic/sys-timex.cpp',
 	'generic/glibc-assert.cpp',
 	'generic/malloc.cpp',
+	'generic/sys-cachectl.cpp',
 	'generic/sys-io.cpp',
 	'generic/search.cpp'
 )
@@ -41,6 +42,7 @@ if not no_headers
 		'include/features.h'
 	)
 	install_headers(
+		'include/sys/cachectl.h',
 		'include/sys/dir.h',
 		'include/sys/ioctl.h',
 		'include/sys/user.h',