Linux Virtualization - Apr 2007 - [PATCH 10/21] i386 Use protected segment for 16bit stack

Use prepare_protected_segment macro to set up the 16-bit stack.

Whee!! This code is almost readable now.

Signed-off-by: Zachary Amsden <zach@vmware.com>
Index: linux-2.6.14-zach-work/arch/i386/kernel/cpu/common.c
==================================================================---
linux-2.6.14-zach-work.orig/arch/i386/kernel/cpu/common.c	2005-11-04
16:54:45.000000000 -0800
+++ linux-2.6.14-zach-work/arch/i386/kernel/cpu/common.c	2005-11-05
00:28:08.000000000 -0800
@@ -607,10 +607,8 @@ void __devinit cpu_init(void)
 	set_base(gdt[GDT_ENTRY_BAD_BIOS_CACHE], __va(BAD_BIOS_AREA));
 
 	/* Set up GDT entry for 16bit stack */
- 	*(__u64 *)(&gdt[GDT_ENTRY_ESPFIX_SS]) |-		((((__u64)stk16_off) <<
16) & 0x000000ffffff0000ULL) |
-		((((__u64)stk16_off) << 32) & 0xff00000000000000ULL) |
-		(CPU_16BIT_STACK_SIZE - 1);
+	prepare_protected_segment(cpu, GDT_ENTRY_ESPFIX_SS, (void *) stk16_off,
+				  CPU_16BIT_STACK_SIZE);
 
 	cpu_gdt_descr[cpu].size = GDT_SIZE - 1;
  	cpu_gdt_descr[cpu].address = (unsigned long)gdt;