From dc3ca729e456d804021ad8a43be5aa0b52126f2c Mon Sep 17 00:00:00 2001
From: Alex <enderice2@users.noreply.github.com>
Date: Tue, 1 Nov 2022 01:55:47 +0200
Subject: [PATCH] Added Fex header

---
 Fex.hpp | 108 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 108 insertions(+)
 create mode 100644 Fex.hpp

diff --git a/Fex.hpp b/Fex.hpp
new file mode 100644
index 0000000..a93be34
--- /dev/null
+++ b/Fex.hpp
@@ -0,0 +1,108 @@
+#ifndef __FENNIX_FILE_FEX_H__
+#define __FENNIX_FILE_FEX_H__
+
+// TODO: EXPERIMENTAL
+
+/**
+ * @brief Fex file format (not finalized)
+ *
+ * @note Instead of HEAD, we can include everything in linker script like this:
+ * @example .header : { BYTE(0x46) BYTE(0x45) BYTE(0x58) BYTE(0x0) } for 'F' 'E' 'X' '\0'
+ *
+ */
+
+/** @brief This may change */
+#define EXTENDED_SECTION_ADDRESS 0x20
+
+enum FexFormatType
+{
+    FexFormatType_Unknown,
+    FexFormatType_Executable,
+    FexFormatType_Driver
+    /* ... */
+};
+
+enum FexOSType
+{
+    FexOSType_Unknown,
+    FexOSType_Fennix,
+    FexOSType_Linux
+    /* ... */
+};
+
+enum FexDriverType
+{
+    FexDriverType_Unknown,
+    FexDriverType_Generic,
+    FexDriverType_Display,
+    FexDriverType_Network,
+    FexDriverType_Storage,
+    FexDriverType_FileSystem,
+    FexDriverType_Input,
+    FexDriverType_Audio
+    /* ... */
+};
+
+struct Fex
+{
+    char Magic[4];
+    enum FexFormatType Type : 4;
+    enum FexOSType OS : 4;
+    int (*Pointer)(struct KernelAPI *);
+} __attribute__((packed));
+
+struct FexExtended
+{
+    struct
+    {
+
+    } Executable;
+
+    struct
+    {
+        char Name[64];
+        enum FexDriverType Type : 4;
+        int (*Callback)(struct KernelCallback *);
+
+        struct DriverBind
+        {
+            int Type;
+            struct
+            {
+                unsigned char Vector;
+            } Interrupt;
+
+            struct
+            {
+                unsigned int ProcessId;
+            } Process;
+
+            struct
+            {
+                unsigned short VendorID;
+                unsigned short DeviceID;
+                unsigned short Class;
+                unsigned short SubClass;
+                unsigned short ProgIF;
+            } PCI;
+        } Bind;
+    } Driver;
+} __attribute__((packed));
+
+/**
+ * @brief Add file header
+ *
+ * @param FormatType FexFormatType
+ * @param OperatingSystem FexOSType
+ * @param Address Pointer to the start function
+ *
+ * @note Must include ".header : { *(.header .header.*) }" in linker script
+ */
+#define HEAD(FormatType, OperatingSystem, Address)        \
+    __attribute__((section(".header"))) Fex FexHeader = { \
+        .Magic = {'F', 'E', 'X', '\0'},                   \
+        .Type = FormatType,                               \
+        .OS = OperatingSystem,                            \
+        .Pointer = Address}
+
+#endif // !__FENNIX_FILE_FEX_H__