4 files changed, 121 insertions, 0 deletions
diff --git a/dev/user/src/GNUmakefile b/dev/user/src/GNUmakefile
new file mode 100644
index 00000000..471e22d1
--- /dev/null
+++ b/dev/user/src/GNUmakefile
@@ -0,0 +1,16 @@
+##################################################
+# (c) Amlal EL Mahrouss, all rights reserved.
+# This is the bootloader makefile.
+##################################################
+
+ASM=nasm
+FLAGS=-f win64
+
+.PHONY: error
+error:
+	@echo "==> Invalid rule."
+	@echo "==> Use sci_asm_io_<arch> instead."
+
+.PHONY: sci_asm_io_x64
+sci_asm_io_x64:
+	$(ASM) $(FLAGS) SystemCall+IO.asm -o SystemCall+IO.o
diff --git a/dev/user/src/LPC.cc b/dev/user/src/LPC.cc
new file mode 100644
index 00000000..f3f320b7
--- /dev/null
+++ b/dev/user/src/LPC.cc
@@ -0,0 +1,10 @@
+/* -------------------------------------------
+
+Copyright (C) 2024-2025, Amlal EL Mahrouss, all rights reserved.
+
+File: LPC.cc
+Purpose: Local Procedure Codes.
+
+------------------------------------------- */
+
+#include <user/LPC.h>
diff --git a/dev/user/src/SystemCall+IO.asm b/dev/user/src/SystemCall+IO.asm
new file mode 100644
index 00000000..769ae513
--- /dev/null
+++ b/dev/user/src/SystemCall+IO.asm
@@ -0,0 +1,50 @@
+;; /*
+;; *	========================================================
+;; *
+;; *	libsci
+;; * 	Copyright (C) 2024-2025, Amlal EL Mahrouss, all rights reserved.
+;; *
+;; * 	========================================================
+;; */
+
+[bits 64]
+
+section .text
+
+global sci_syscall_arg_1
+global sci_syscall_arg_2
+global sci_syscall_arg_3
+global sci_syscall_arg_4
+
+sci_syscall_arg_1:
+    mov r8, rcx
+    syscall
+    ret
+
+sci_syscall_arg_2:
+    mov r8, rcx
+    mov r9, rdx
+    syscall
+    ret
+
+sci_syscall_arg_3:
+    mov rbx, r8
+
+    mov r8, rcx
+    mov r9, rdx
+    mov r10, rbx
+
+    syscall
+    ret
+
+sci_syscall_arg_4:
+    mov rbx, r8
+    mov rax, r9
+
+    mov r8, rcx
+    mov r9, rdx
+    mov r10, rbx
+    mov r11, rax
+
+    syscall
+    ret
diff --git a/dev/user/src/SystemCalls.cc b/dev/user/src/SystemCalls.cc
new file mode 100644
index 00000000..eadb07ce
--- /dev/null
+++ b/dev/user/src/SystemCalls.cc
@@ -0,0 +1,45 @@
+/* -------------------------------------------
+
+	Copyright (C) 2024-2025, Amlal EL Mahrouss, all rights reserved.
+
+------------------------------------------- */
+
+#include <user/SystemCalls.h>
+
+/// @file libsci.cc
+/// @brief Source file for the memory functions of the libsci.
+
+/// @brief Copy memory region.
+IMPORT_C VoidPtr MmCopyMemory(_Input VoidPtr dest, _Input VoidPtr src, _Input SizeT len)
+{
+	if (!len ||
+		!dest ||
+		!src)
+	{
+		return nullptr;
+	}
+
+	for (SizeT i = 0; i < len; i++)
+	{
+		((Char*)dest)[i] = ((Char*)src)[i];
+	}
+
+	return dest;
+}
+
+/// @brief Fill memory region with **value**.
+IMPORT_C VoidPtr MmFillMemory(_Input VoidPtr dest, _Input SizeT len, _Input UInt8 value)
+{
+	if (!len ||
+		!dest)
+	{
+		return nullptr;
+	}
+
+	for (SizeT i = 0; i < len; i++)
+	{
+		((Char*)dest)[i] = value;
+	}
+
+	return dest;
+}