kernel: refactor syscall dispatch system

syscall/dispatch.c

@@ -0,0 +1,21 @@
+#include <mango/machine/cpu.h>
+#include <mango/printk.h>
+#include <mango/syscall.h>
+
+#define SYSCALL_TABLE_ENTRY(id, p) [SYS_##id] = (virt_addr_t)(sys_##p)
+
+static const virt_addr_t syscall_table[] = {
+	SYSCALL_TABLE_ENTRY(EXIT, exit),
+	SYSCALL_TABLE_ENTRY(VM_OBJECT_CREATE, vm_object_create),
+};
+static const size_t syscall_table_count
+	= sizeof syscall_table / sizeof syscall_table[0];
+
+virt_addr_t syscall_get_function(unsigned int sysid)
+{
+	if (sysid >= syscall_table_count) {
+		return 0;
+	}
+
+	return syscall_table[sysid];
+}