user: implement mlibc as the libc, finally.

It's finally done..

Signed-off-by: kaguya <vpshinomiya@protonmail.com>

user/include/mlibc/options/internal/x86_64-include/mlibc/arch-defs.hpp

@@ -0,0 +1,12 @@
+#ifndef MLIBC_ARCH_DEFS_HPP
+#define MLIBC_ARCH_DEFS_HPP
+
+#include <stddef.h>
+
+namespace mlibc {
+
+inline constexpr size_t page_size = 0x1000;
+
+} // namespace mlibc
+
+#endif // MLIBC_ARCH_DEFS_HPP

user/include/mlibc/options/internal/x86_64-include/mlibc/thread.hpp

@@ -0,0 +1,20 @@
+#pragma once
+
+#include <stdint.h>
+#include <mlibc/tcb.hpp>
+
+namespace mlibc {
+
+inline Tcb *get_current_tcb() {
+	uintptr_t ptr;
+	asm volatile ("movq %%fs:0, %0" : "=r"(ptr));
+	return reinterpret_cast<Tcb *>(ptr);
+}
+
+inline uintptr_t get_sp() {
+	uintptr_t rsp;
+	asm volatile ("mov %%rsp, %0" : "=r"(rsp));
+	return rsp;
+}
+
+} // namespace mlibc