Removed DS, ES, FS and GS registers from task switch routines

arch/x86/include/asm/stddef.h

@@ -70,18 +70,6 @@ typedef unsigned int wint_t;
  * All the interrupt handler routines use this type for their only parameter.
  */
 struct state {
-	/// GS register
-	unsigned short gs;
-	unsigned short __gs;
-	/// FS register
-	unsigned short fs;
-	unsigned short __fs;
-	/// ES register
-	unsigned short es;
-	unsigned short __es;
-	/// ds register
-	unsigned short ds;
-	unsigned short __ds;
 	/// EDI register
 	unsigned int edi;
 	/// ESI register

arch/x86/kernel/entry.asm

@@ -515,25 +515,16 @@ sw_switch_context:
     push DWORD 0
     push DWORD 0xc0edbabe
     pusha
-    push ds
-    push es
-    push fs
-    push gs
     pushf
     pop eax
-    mov [esp+64], eax
+    mov [esp+48], eax
 
-    mov ecx, [esp+68]
+    mov ecx, [esp+52]
     mov [ecx], esp
-    mov ecx, [esp+72]
+    mov ecx, [esp+56]
     mov esp, [ecx]
 
 sw_rollback:
-
-    pop gs
-    pop fs
-    pop es
-    pop ds
     popa
 
     add esp, 8
@@ -800,22 +791,13 @@ extern irq_handler
 
 common_stub:
     pusha
-    push ds
-    push es
-    push fs
-    push gs
 
     ; use the same handler for interrupts and exceptions
     push esp
     call irq_handler
     add esp, 4
 
-    pop gs
-    pop fs
-    pop es
-    pop ds
     popa
-
     add esp, 8
     iret
 

arch/x86/kernel/gdt.c

@@ -157,7 +157,6 @@ int create_default_frame(task_t* task, internal_entry_point_t ep, void* arg)
 
 	stptr = stack;
 	memset(stptr, 0x00, short_state_size*sizeof(uint32_t));
-	stptr->gs = stptr->fs = stptr->es = stptr->ds = ds;
 	stptr->esp = stack +short_state_size;
 	stptr->int_no = 0xB16B00B5;
 	stptr->error =  0xC03DB4B3;