Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.

===================================================================
RCS file: /ftp/cvs/cvsroot/src/sys/arch/i386/i386/locore.S,v
rcsdiff: /ftp/cvs/cvsroot/src/sys/arch/i386/i386/locore.S,v: warning: Unknown phrases like `commitid ...;' are present.
retrieving revision 1.94.2.1
retrieving revision 1.101
diff -u -p -r1.94.2.1 -r1.101
--- src/sys/arch/i386/i386/locore.S	2011/06/06 09:05:49	1.94.2.1
+++ src/sys/arch/i386/i386/locore.S	2012/06/27 00:37:08	1.101
@@ -1,4 +1,4 @@
-/*	$NetBSD: locore.S,v 1.94.2.1 2011/06/06 09:05:49 jruoho Exp $	*/
+/*	$NetBSD: locore.S,v 1.101 2012/06/27 00:37:08 jym Exp $	*/
 
 /*
  * Copyright-o-rama!
@@ -129,7 +129,7 @@
  */
 
 #include <machine/asm.h>
-__KERNEL_RCSID(0, "$NetBSD: locore.S,v 1.94.2.1 2011/06/06 09:05:49 jruoho Exp $");
+__KERNEL_RCSID(0, "$NetBSD: locore.S,v 1.101 2012/06/27 00:37:08 jym Exp $");
 
 #include "opt_compat_oldboot.h"
 #include "opt_ddb.h"
@@ -169,18 +169,11 @@ __KERNEL_RCSID(0, "$NetBSD: locore.S,v 1
  */
 .section __xen_guest
 	.ascii	"GUEST_OS=netbsd,GUEST_VER=3.0,XEN_VER=xen-3.0"
-#if defined(DOM0OPS) || !defined(XEN_COMPAT_030001)
 	.ascii  ",VIRT_BASE=0xc0000000" /* KERNBASE */
 	.ascii  ",ELF_PADDR_OFFSET=0xc0000000" /* KERNBASE */
-#else
-	.ascii  ",VIRT_BASE=0xc0100000" /* KERNTEXTOFF */
-	.ascii  ",ELF_PADDR_OFFSET=0xc0100000" /* KERNTEXTOFF */
-#endif
 	.ascii  ",VIRT_ENTRY=0xc0100000" /* KERNTEXTOFF */
-#if !defined(XEN_COMPAT_030001)
 	.ascii  ",HYPERCALL_PAGE=0x00000101"
 		/* (???+HYPERCALL_PAGE_OFFSET)/PAGE_SIZE) */
-#endif
 #ifdef PAE
 	.ascii  ",PAE=yes[extended-cr3]"
 #endif
@@ -196,7 +189,7 @@ __KERNEL_RCSID(0, "$NetBSD: locore.S,v 1
  */
 	.data
 
-	.globl	_C_LABEL(cpu)
+	.globl	_C_LABEL(cputype)
 	.globl	_C_LABEL(cpuid_level)
 	.globl	_C_LABEL(esym)
 	.globl	_C_LABEL(eblob)
@@ -229,7 +222,7 @@ _C_LABEL(lapic_tpr):
 	.long 0
 #endif
 
-_C_LABEL(cpu):		.long	0	# are we 80486, Pentium, or..
+_C_LABEL(cputype):	.long	0	# are we 80486, Pentium, or..
 _C_LABEL(cpuid_level):	.long	0
 _C_LABEL(atdevbase):	.long	0	# location of start of iomem in virtual
 _C_LABEL(lwp0uarea):	.long	0
@@ -238,7 +231,12 @@ _C_LABEL(tablesize):	.long	0
 
 	.space 512
 tmpstk:
-
+#ifdef XEN
+	.align 		PAGE_SIZE, 0x0	# Align on page boundary
+_C_LABEL(tmpgdt):
+	.space 		PAGE_SIZE	# Xen expects a page
+#endif /* XEN */
+	.globl tmpgdt
 #ifndef XEN
 #define	_RELOC(x)	((x) - KERNBASE)
 #else
@@ -341,11 +339,11 @@ isnx586:
 	 * Don't try cpuid, as Nx586s reportedly don't support the
 	 * PSL_ID bit.
 	 */
-	movl	$CPU_NX586,RELOC(cpu)
+	movl	$CPU_NX586,RELOC(cputype)
 	jmp	2f
 
 is386:
-	movl	$CPU_386,RELOC(cpu)
+	movl	$CPU_386,RELOC(cputype)
 	jmp	2f
 
 try486:	/* Try to toggle identification flag; does not exist on early 486s. */
@@ -364,7 +362,7 @@ try486:	/* Try to toggle identification 
 
 	testl	%eax,%eax
 	jnz	try586
-is486:	movl	$CPU_486,RELOC(cpu)
+is486:	movl	$CPU_486,RELOC(cputype)
 	/*
 	 * Check Cyrix CPU
 	 * Cyrix CPUs do not change the undefined flags following
@@ -382,7 +380,7 @@ is486:	movl	$CPU_486,RELOC(cpu)
 	popfl
 	jmp 2f
 trycyrix486:
-	movl	$CPU_6x86,RELOC(cpu) 	# set CPU type
+	movl	$CPU_6x86,RELOC(cputype)	# set CPU type
 	/*
 	 * Check for Cyrix 486 CPU by seeing if the flags change during a
 	 * divide. This is documented in the Cx486SLC/e SMM Programmer's
@@ -400,7 +398,7 @@ trycyrix486:
 	xorl	%ecx,%eax		# are the flags different?
 	testl	$0x8d5,%eax		# only check C|PF|AF|Z|N|V
 	jne	2f			# yes; must be Cyrix 6x86 CPU
-	movl	$CPU_486DLC,RELOC(cpu) 	# set CPU type
+	movl	$CPU_486DLC,RELOC(cputype) 	# set CPU type
 
 #ifndef CYRIX_CACHE_WORKS
 	/* Disable caching of the ISA hole only. */
@@ -677,7 +675,7 @@ try586:	/* Use the `cpuid' instruction. 
  	 */
 	movl	%cr0,%eax		# get control word
 					# enable paging & NPX emulation
-	orl	$(CR0_PE|CR0_PG|CR0_NE|CR0_TS|CR0_EM|CR0_MP),%eax
+	orl	$(CR0_PE|CR0_PG|CR0_NE|CR0_TS|CR0_EM|CR0_MP|CR0_WP|CR0_AM),%eax
 	movl	%eax,%cr0		# and page NOW!
 
 	pushl	$begin			# jump to high mem
@@ -787,6 +785,15 @@ start:
 	cpuid
 	movl	%eax,RELOC(cpuid_level)
 
+	/*
+	 * Use a temp page. We'll re- add it to uvm(9) once we're
+	 * done using it.
+	 */
+	movl	$RELOC(tmpgdt), %eax
+	pushl	%eax		# start of temporary gdt
+	call	_C_LABEL(initgdt)
+	addl	$4,%esp
+
 	call	xen_pmap_bootstrap
 
 	/*
@@ -810,13 +817,13 @@ start:
 	addl	$PDE_SIZE,%esp		# pop paddr_t
 	call 	_C_LABEL(main)
 
-#if defined(XEN) && !defined(XEN_COMPAT_030001)
+#if defined(XEN)
 /* space for the hypercall call page */
 #define HYPERCALL_PAGE_OFFSET 0x1000
 .org HYPERCALL_PAGE_OFFSET
 ENTRY(hypercall_page)
 .skip 0x1000
-#endif /* defined(XEN) && !defined(XEN_COMPAT_030001) */
+#endif /* defined(XEN) */
 
 /*
  * void lgdt_finish(void);
@@ -999,15 +1006,17 @@ ENTRY(cpu_switchto)
 	pushl	%edi
 	call	_C_LABEL(i386_switch_context)
 	addl	$4,%esp
-#else /* XEN */
+#else /* !XEN */
 	/* Switch ring0 esp */
 	movl	PCB_ESP0(%ebx),%eax
 	movl	%eax,CPUVAR(ESP0)
+#endif /* !XEN */
 
 	/* Don't bother with the rest if switching to a system process. */
 	testl	$LW_SYSTEM,L_FLAG(%edi)
 	jnz	4f
 
+#ifndef XEN
 	/* Restore thread-private %fs/%gs descriptors. */
 	movl	CPUVAR(GDT),%ecx
 	movl	PCB_FSD(%ebx), %eax
@@ -1018,7 +1027,7 @@ ENTRY(cpu_switchto)
 	movl	PCB_GSD+4(%ebx), %edx
 	movl	%eax, (GUGS_SEL*8)(%ecx)
 	movl	%edx, (GUGS_SEL*8+4)(%ecx)
-#endif /* XEN */
+#endif /* !XEN */
 
 	/* Switch I/O bitmap */
 	movl	PCB_IOMAP(%ebx),%eax
@@ -1038,7 +1047,11 @@ ENTRY(cpu_switchto)
 	 * is deferred until mi_switch(), when cpu_switchto() returns.
 	 */
 2:
-#ifndef XEN
+#ifdef XEN
+	pushl	%edi
+	call	_C_LABEL(i386_tls_switch)
+	addl	$4,%esp
+#else /* !XEN */
 	movl	$IPL_HIGH,CPUVAR(ILEVEL)
 	movl	PCB_CR0(%ebx),%ecx		/* has CR0_TS clear */
 	movl	%cr0,%edx
@@ -1055,7 +1068,7 @@ ENTRY(cpu_switchto)
 3:	cmpl	%edx,%ecx
 	je	4f
 	movl	%ecx,%cr0
-#endif /* XEN */
+#endif /* !XEN */
 
 	/* Return to the new LWP, returning 'oldlwp' in %eax. */
 4:	movl	%esi,%eax