[PATCH] x86_64: Remove BIOS reboot code

Remove BIOS reboot code

Remove the never quite working BIOS reboot code.  This gets rid of a lot of
code.
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/x86_64/kernel/Makefile

@@ -7,7 +7,7 @@ EXTRA_AFLAGS	:= -traditional
 obj-y	:= process.o semaphore.o signal.o entry.o traps.o irq.o \
 		ptrace.o time.o ioport.o ldt.o setup.o i8259.o sys_x86_64.o \
 		x8664_ksyms.o i387.o syscall.o vsyscall.o \
-		setup64.o bootflag.o e820.o reboot.o warmreboot.o quirks.o
+		setup64.o bootflag.o e820.o reboot.o quirks.o
 
 obj-$(CONFIG_X86_MCE)         += mce.o
 obj-$(CONFIG_X86_MCE_INTEL)	+= mce_intel.o

arch/x86_64/kernel/reboot.c

@@ -22,14 +22,12 @@ void (*pm_power_off)(void);
 
 static long no_idt[3];
 static enum { 
-	BOOT_BIOS = 'b',
 	BOOT_TRIPLE = 't',
 	BOOT_KBD = 'k'
 } reboot_type = BOOT_KBD;
 static int reboot_mode = 0;
 
-/* reboot=b[ios] | t[riple] | k[bd] [, [w]arm | [c]old]
-   bios	  Use the CPU reboot vector for warm reset
+/* reboot=t[riple] | k[bd] [, [w]arm | [c]old]
    warm   Don't set the cold reboot flag
    cold   Set the cold reboot flag
    triple Force a triple fault (init)
@@ -63,34 +61,6 @@ static int __init reboot_setup(char *str)
 
 __setup("reboot=", reboot_setup);
 
-/* overwrites random kernel memory. Should not be kernel .text */
-#define WARMBOOT_TRAMP 0x1000UL
-
-static void reboot_warm(void)
-{
-	extern unsigned char warm_reboot[], warm_reboot_end[];
-	printk("warm reboot\n");
-
-	local_irq_disable(); 
-		
-	/* restore identity mapping */
-	init_level4_pgt[0] = __pgd(__pa(level3_ident_pgt) | 7); 
-	__flush_tlb_all(); 
-
-	/* Move the trampoline to low memory */
-	memcpy(__va(WARMBOOT_TRAMP), warm_reboot, warm_reboot_end - warm_reboot); 
-
-	/* Start it in compatibility mode. */
-	asm volatile( "   pushq $0\n" 		/* ss */
-		     "   pushq $0x2000\n" 	/* rsp */
-	             "   pushfq\n"		/* eflags */
-		     "   pushq %[cs]\n"
-		     "   pushq %[target]\n"
-		     "   iretq" :: 
-		      [cs] "i" (__KERNEL_COMPAT32_CS), 
-		      [target] "b" (WARMBOOT_TRAMP));
-}
-
 #ifdef CONFIG_SMP
 static void smp_halt(void)
 {
@@ -149,9 +119,6 @@ void machine_restart(char * __unused)
 	for (;;) {
 		/* Could also try the reset bit in the Hammer NB */
 		switch (reboot_type) { 
-		case BOOT_BIOS:
-			reboot_warm();
-
 		case BOOT_KBD:
 		for (i=0; i<100; i++) {
 			kb_wait();

arch/x86_64/kernel/warmreboot.S

-/*
- * Switch back to real mode and call the BIOS reboot vector.
- * This is a trampoline copied around in process.c 
- * Written 2003 by Andi Kleen, SuSE Labs.	 	
- */			
-	
-#include <asm/msr.h>
-
-#define R(x) x-warm_reboot(%ebx)
-#define R64(x) x-warm_reboot(%rbx)
-		
-	/* running in identity mapping and in the first 64k of memory
-	   and in compatibility mode. This must be position independent */
-
-	/* Follows 14.7 "Leaving Long Mode" in the AMD x86-64 manual, volume 2
-	   and 8.9.2 "Switching Back to Real-Address Mode" in the Intel IA32
-	   manual, volume 2 */
-
-	/* ebx:	self pointer to warm_reboot */
-
-	.globl warm_reboot
-warm_reboot:
-	addl  %ebx,  R64(real_mode_desc)	/* relocate tables */
-	addl  %ebx,2+R64(warm_gdt_desc)		
-
-	movq  %cr0,%rax
-	btr  $31,%rax		
-	movq %rax,%cr0		/* disable paging */
-	jmp  1f			/* flush prefetch queue */
-	
-	.code32	
-1:	movl $MSR_EFER,%ecx
-	rdmsr
-	andl $~((1<<_EFER_LME)|(1<<_EFER_SCE)|(1<<_EFER_NX)),%eax
-	wrmsr			/* disable long mode in EFER */
-		
-	xorl %eax,%eax
-	movl %eax,%cr3		/* flush tlb */
-
-	/* Running protected mode without paging now */
-	
-	wbinvd			/* flush caches. Needed? */
-
-	lidt R(warm_idt_desc)
-	lgdt R(warm_gdt_desc)
-	
-	movl $0x10,%ecx		/* load segment registers with real mode settings */
-	movl %ecx,%ds
-	movl %ecx,%es
-	movl %ecx,%fs
-	movl %ecx,%gs
-	movl %ecx,%ss
-	
-	lea  R(real_mode_desc),%eax		
-	ljmp *(%eax)
-
-	.code16:
-real_mode:
-	xorl %eax,%eax
-	movl %eax,%cr0
-	
-	/* some people claim $0xf000,0xfff0 is better. Use what 32bit linux uses. */
-	/* code as bytes because gas has problems with it */
-	.byte 	0xea,0xf0,0xff,0x00,0xf0	/* ljmp  0xf000:0xfff0 */
-
-real_mode_desc:
-	.long  real_mode - warm_reboot
-	.short 8	
-warm_gdt_desc:
-	.short 8*3
-	.long warm_gdt - warm_reboot
-warm_gdt:	
-	.quad   0
-	.quad 	0x00009a000000ffff	/* 16-bit real-mode 64k code at 0x00000000 */
-	.quad   0x000092000100ffff	/* 16-bit real-mode 64k data at 0x00000100 */
-	
-warm_idt_desc:
-	.short 0x3ff
-	.long  0
-				
-	.globl warm_reboot_end
-warm_reboot_end:
-