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

@@ -0,0 +1,50 @@
+/*  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
+
+
+
+
+#endif

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

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

linker.ld

@@ -4,7 +4,7 @@ ENTRY(start)
 SECTIONS
 {
     /*start me at 1Mb because below that is x86 essential stuff, which we dont want to be written on top of.*/
-	. = 2M;
+	. = 1M;
 
 	/* we're going to maintain 4K alignment - apparently useful for paging, and i'm not complaining about the lost space anyway. */
 
@@ -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)
 	}
 }

src/kdtables.c

@@ -0,0 +1,7 @@
+/*  kdtables.c
+*   Kernel Descriptor Tables
+*   
+*   Contains GDT, LDT, and any relevant functions and structs pertaining to them
+*/
+
+

src/main.c

@@ -10,7 +10,6 @@ void kern_main(uint32_t multiboot_magic, multiboot_info_t* multiboot_info)
 {
     //wipe the screen
 	vga_clear();
-
 	//We're going to use this buffer as our 8char hex representation for reading mem
 
     vga_printf("Entry eax:%X\n", multiboot_magic);
@@ -24,6 +23,5 @@ void kern_main(uint32_t multiboot_magic, multiboot_info_t* multiboot_info)
 
     vga_printf("MEM_LOWER:%X\n", multiboot_info->mem_lower);
     vga_printf("MEM_UPPER:%X\n", multiboot_info->mem_upper);
-     
 }
 

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
  
@@ -28,6 +27,18 @@
 	//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!