Include liburing in static build

src/liburing/arch/riscv64/lib.h

@@ -0,0 +1,48 @@
+/* SPDX-License-Identifier: MIT */
+
+#ifndef LIBURING_ARCH_RISCV64_LIB_H
+#define LIBURING_ARCH_RISCV64_LIB_H
+
+#include <elf.h>
+#include <sys/auxv.h>
+#include "../../syscall.h"
+
+static inline long __get_page_size(void)
+{
+	Elf64_Off buf[2];
+	long ret = 4096;
+	int fd;
+
+	fd = __sys_open("/proc/self/auxv", O_RDONLY, 0);
+	if (fd < 0)
+		return ret;
+
+	while (1) {
+		ssize_t x;
+
+		x = __sys_read(fd, buf, sizeof(buf));
+		if (x < (long) sizeof(buf))
+			break;
+
+		if (buf[0] == AT_PAGESZ) {
+			ret = buf[1];
+			break;
+		}
+	}
+
+	__sys_close(fd);
+	return ret;
+}
+
+static inline long get_page_size(void)
+{
+	static long cache_val;
+
+	if (cache_val)
+		return cache_val;
+
+	cache_val = __get_page_size();
+	return cache_val;
+}
+
+#endif /* #ifndef LIBURING_ARCH_RISCV64_LIB_H */