From d97ec36f8c86036b0378e9e900a2c93286b08cd5 Mon Sep 17 00:00:00 2001
From: lordtet <lordtet@foxcarries.me>
Date: Tue, 10 Jun 2025 09:17:21 -0400
Subject: [PATCH] Half-baked commit, but i added a struct type for the tss and
 allocated some memory for it in bss. Also put some space in for the gdt in
 rodata. Need to leave now, so this broken build goes to the repo!

---
 include/kdtables.h   | 44 ++++++++++++++++++++++++++++++++++++++++++++
 include/kio.h        |  5 +++++
 include/kmultiboot.h |  6 ++++--
 linker.ld            |  2 ++
 src/kdtables.c       |  7 +++++++
 src/start.s          | 13 ++++++++++++-
 6 files changed, 74 insertions(+), 3 deletions(-)

diff --git a/include/kdtables.h b/include/kdtables.h
index fbb6be1..92edd20 100644
--- a/include/kdtables.h
+++ b/include/kdtables.h
@@ -1,5 +1,49 @@
+/*  kdtables.h
+*   Kernel Discriptor Tables
+*
+*   Contains GDT, IDT, and any relevant functions and structs pertaining to them
+*   
+*/
 #ifndef KDTABLES_H
 #define KDTABLES_H
+#include <stdint.h>
+
+// TSS
+typedef struct tss_s {
+    uint32_t LINK;
+    uint32_t ESP0;
+    uint32_t SS0;
+    uint32_t ESP1;
+    uint32_t SS1;
+    uint32_t ESP2;
+    uint32_t SS2;
+    uint32_t CR3;
+    uint32_t EIP;
+    uint32_t EFLAGS;
+    uint32_t EAX;
+    uint32_t ECX;
+    uint32_t EDX;
+    uint32_t EBX;
+    uint32_t ESP;
+    uint32_t ESI;
+    uint32_t EDI;
+    uint32_t ES;
+    uint32_t CS;
+    uint32_t SS;
+    uint32_t DS;
+    uint32_t FS;
+    uint32_t GS;
+    uint32_t LDTR;
+    uint32_t IOPB;
+    uint32_t SSP;
+} __attribute__((packed)) tss_t; 
+
+extern tss_t tss;
+
+void clear_tss(); 
+
+// GDT
+
 
 
 
diff --git a/include/kio.h b/include/kio.h
index ff1cc13..cf2286c 100644
--- a/include/kio.h
+++ b/include/kio.h
@@ -1,3 +1,8 @@
+/*  kio.h
+ *  Kernel I/O
+ *
+ *  Handles any in/output
+ */
 #ifndef KIO_H
 #define KIO_H
 #define VGA_GRID_COLS 80
diff --git a/include/kmultiboot.h b/include/kmultiboot.h
index 9997d53..a8e6f91 100644
--- a/include/kmultiboot.h
+++ b/include/kmultiboot.h
@@ -1,6 +1,8 @@
 #ifndef KMULTIBOOT_H
 #define KMULTIBOOT_H
 
+#include <stdint.h>
+
 typedef struct {
     uint32_t flags;
     uint32_t mem_lower;
@@ -9,13 +11,13 @@ typedef struct {
     uint32_t cmdline;
     uint32_t mods_count;
     uint32_t mods_addr;
-} multiboot_info_t;
+} mb_info_t;
 
 typedef struct multiboot_mmap_entry {
     uint32_t ssize; //size of the entry
     uint64_t addr; //physical location of memory
     uint64_t msize;
     uint32_t type;
-} __attribute__((packed));
+} __attribute__((packed)) mb_mmap_entry_t;
 
 #endif
diff --git a/linker.ld b/linker.ld
index 78a5f6d..85dda0f 100644
--- a/linker.ld
+++ b/linker.ld
@@ -20,6 +20,7 @@ SECTIONS
 	.rodata BLOCK(4K) : ALIGN(4K)
 	{
 		*(.rodata*)
+        *(.gdt_sect)
 	}
 
 	/*initialized rw data. */
@@ -33,5 +34,6 @@ SECTIONS
 	{
 		*(COMMON)
 		*(.bss)
+        *(.tss_sect)
 	}
 }
diff --git a/src/kdtables.c b/src/kdtables.c
index e69de29..046bcf2 100644
--- a/src/kdtables.c
+++ b/src/kdtables.c
@@ -0,0 +1,7 @@
+/*  kdtables.c
+*   Kernel Descriptor Tables
+*   
+*   Contains GDT, LDT, and any relevant functions and structs pertaining to them
+*/
+
+
diff --git a/src/start.s b/src/start.s
index 5f2dbaa..14322da 100644
--- a/src/start.s
+++ b/src/start.s
@@ -1,7 +1,6 @@
 //C main function for our kernel
 //See: kernel.c
 .extern kern_main
-
 //This will be our entrypoint function name - gotta initialize it now as global so the linker knows later.
 .global start
  
@@ -28,7 +27,19 @@
 	//Remember, stack grows DOWNWARD! So the last thing in the section -> the highest memory address -> the very first thing on the stack!
     //Therefore, we put a label here to represent the top of our stack for later.
     stack_top:
+    //Allocation of some space for our TSS.
+    
+
+.section .tss_sect:
+    .align 8
+    tss:
+        .skip 104
  
+.section .gdt_sect:
+    .align 8
+    gdt:
+        .skip 48
+
 
 //Actual code. Entry point goes here!
 .section .text