syscall: add lots of syscalls

syscall/config.c

@@ -0,0 +1,30 @@
+#include <kernel/sched.h>
+#include <kernel/syscall.h>
+#include <kernel/vm-region.h>
+
+kern_status_t sys_kern_config_get(kern_config_key_t key, void *ptr, size_t len)
+{
+	struct task *self = current_task();
+
+	switch (key) {
+	case KERN_CFG_PAGE_SIZE:
+		if (!validate_access_w(self, ptr, sizeof(uintptr_t))) {
+			return KERN_MEMORY_FAULT;
+		}
+
+		*(uint32_t *)ptr = VM_PAGE_SIZE;
+		return KERN_OK;
+	default:
+		return KERN_INVALID_ARGUMENT;
+	}
+
+	return KERN_UNSUPPORTED;
+}
+
+kern_status_t sys_kern_config_set(
+	kern_config_key_t key,
+	const void *ptr,
+	size_t len)
+{
+	return KERN_ACCESS_DENIED;
+}