From 0b0f61ae48bbd8827d6088feab6cf58e7837bf92 Mon Sep 17 00:00:00 2001
From: Amlal El Mahrouss <amlal@nekernel.org>
Date: Tue, 15 Apr 2025 17:04:45 +0200
Subject: dev, user: drafting a system call map.

Signed-off-by: Amlal El Mahrouss <amlal@nekernel.org>
---
 dev/user/Macros.h           | 34 +++++++++++++++++++++++++++++++-
 dev/user/src/SystemCalls.cc | 48 ++++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 80 insertions(+), 2 deletions(-)

(limited to 'dev')

diff --git a/dev/user/Macros.h b/dev/user/Macros.h
index 98beeb0d..556833ea 100644
--- a/dev/user/Macros.h
+++ b/dev/user/Macros.h
@@ -90,4 +90,36 @@ IMPORT_C void _rtl_assert(Bool expr, const Char* origin);
 #define ARRAY_SIZE(X)              \
 	(((sizeof(X) / sizeof(*(X))) / \
 	  (static_cast<SizeT>(!(sizeof(X) % sizeof(*(X)))))))
-#endif
\ No newline at end of file
+#endif
+
+#ifndef KIB
+#define KIB(X) (UInt64)((X) / 1024)
+#endif
+
+#ifndef kib_cast
+#define kib_cast(X) (UInt64)((X)*1024)
+#endif
+
+#ifndef MIB
+#define MIB(X) (UInt64)((UInt64)KIB(X) / 1024)
+#endif
+
+#ifndef mib_cast
+#define mib_cast(X) (UInt64)((UInt64)kib_cast(X) * 1024)
+#endif
+
+#ifndef GIB
+#define GIB(X) (UInt64)((UInt64)MIB(X) / 1024)
+#endif
+
+#ifndef gib_cast
+#define gib_cast(X) (UInt64)((UInt64)mib_cast(X) * 1024)
+#endif
+
+#ifndef TIB
+#define TIB(X) (UInt64)((UInt64)GIB(X) / 1024)
+#endif
+
+#ifndef tib_cast
+#define tib_cast(X) ((UInt64)gib_cast(X) * 1024)
+#endif
diff --git a/dev/user/src/SystemCalls.cc b/dev/user/src/SystemCalls.cc
index 2dd27dc0..7ad0fe6f 100644
--- a/dev/user/src/SystemCalls.cc
+++ b/dev/user/src/SystemCalls.cc
@@ -6,9 +6,14 @@
 
 #include <user/SystemCalls.h>
 
-/// @file libsci.cc
+/// @file SystemCalls.cc
 /// @brief Source file for the memory functions of the libsci.
 
+IMPORT_C VoidPtr sci_syscall_arg_1(SizeT id);
+IMPORT_C VoidPtr sci_syscall_arg_2(SizeT id, VoidPtr arg1);
+IMPORT_C VoidPtr sci_syscall_arg_3(SizeT id, VoidPtr arg1, VoidPtr arg3);
+IMPORT_C VoidPtr sci_syscall_arg_4(SizeT id, VoidPtr arg1, VoidPtr arg3, VoidPtr arg4);
+
 /// @brief Copy memory region.
 IMPORT_C VoidPtr MmCopyMemory(_Input VoidPtr dest, _Input VoidPtr src, _Input SizeT len)
 {
@@ -27,6 +32,21 @@ IMPORT_C VoidPtr MmCopyMemory(_Input VoidPtr dest, _Input VoidPtr src, _Input Si
 	return dest;
 }
 
+IMPORT_C SInt64 MmStrLen(const Char* in)
+{
+	if (!in)
+		return 0;
+
+	SizeT len{0};
+
+	do
+	{
+		++len;
+	} while (in[len] != '\0');
+
+	return len;
+}
+
 /// @brief Fill memory region **dest** with **value**.
 IMPORT_C VoidPtr MmFillMemory(_Input VoidPtr dest, _Input SizeT len, _Input UInt8 value)
 {
@@ -43,3 +63,29 @@ IMPORT_C VoidPtr MmFillMemory(_Input VoidPtr dest, _Input SizeT len, _Input UInt
 
 	return dest;
 }
+
+IMPORT_C Ref IoOpenFile(_Input const Char* path, _Input const Char* drv_letter)
+{
+	return sci_syscall_arg_3(1, reinterpret_cast<VoidPtr>(const_cast<Char*>(path)),
+							 reinterpret_cast<VoidPtr>(const_cast<Char*>(drv_letter)));
+}
+
+IMPORT_C Void IoCloseFile(_Input Ref desc)
+{
+	sci_syscall_arg_2(2, desc);
+}
+
+IMPORT_C UInt64 IoSeekFile(_Input Ref desc, _Input UInt64 off)
+{
+	auto ret = (UInt64*)sci_syscall_arg_3(3, reinterpret_cast<VoidPtr>(desc),
+										  reinterpret_cast<VoidPtr>(&off));
+
+	MUST_PASS((*ret) != ~0UL);
+	return *ret;
+}
+
+IMPORT_C UInt64 IoTellFile(_Input Ref desc)
+{
+	auto ret = (UInt64*)sci_syscall_arg_2(4, reinterpret_cast<VoidPtr>(desc));
+	return *ret;
+}
-- 
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