From 49533df72ec8ed97083fba80561fdfb9e04e8409 Mon Sep 17 00:00:00 2001
From: Jacek Galowicz <jacek.galowicz@rwth-aachen.de>
Date: Wed, 11 Apr 2012 08:41:58 +0200
Subject: [PATCH] Made the interrupt entry also safe the registers DS to GS.

This may be removed in the future for speed purposes.
---
 arch/x86/include/asm/stddef.h | 12 ++++++++++++
 arch/x86/kernel/entry.asm     |  9 +++++++++
 2 files changed, 21 insertions(+)

diff --git a/arch/x86/include/asm/stddef.h b/arch/x86/include/asm/stddef.h
index f3ef4468..581c72ab 100644
--- a/arch/x86/include/asm/stddef.h
+++ b/arch/x86/include/asm/stddef.h
@@ -70,6 +70,18 @@ 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
diff --git a/arch/x86/kernel/entry.asm b/arch/x86/kernel/entry.asm
index 8d34dff9..8f9a3973 100644
--- a/arch/x86/kernel/entry.asm
+++ b/arch/x86/kernel/entry.asm
@@ -767,13 +767,22 @@ 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 gs
     popa
+
     add esp, 8
     iret