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 1.140
retrieving revision 1.151
diff -u -p -r1.140 -r1.151
--- src/sys/arch/i386/i386/locore.S	2016/11/11 11:34:51	1.140
+++ src/sys/arch/i386/i386/locore.S	2017/08/12 07:21:57	1.151
@@ -1,4 +1,4 @@
-/*	$NetBSD: locore.S,v 1.140 2016/11/11 11:34:51 maxv Exp $	*/
+/*	$NetBSD: locore.S,v 1.151 2017/08/12 07:21:57 maxv Exp $	*/
 
 /*
  * Copyright-o-rama!
@@ -128,15 +128,13 @@
  */
 
 #include <machine/asm.h>
-__KERNEL_RCSID(0, "$NetBSD: locore.S,v 1.140 2016/11/11 11:34:51 maxv Exp $");
+__KERNEL_RCSID(0, "$NetBSD: locore.S,v 1.151 2017/08/12 07:21:57 maxv Exp $");
 
-#include "opt_compat_oldboot.h"
 #include "opt_copy_symtab.h"
 #include "opt_ddb.h"
 #include "opt_modular.h"
 #include "opt_multiboot.h"
 #include "opt_realmem.h"
-#include "opt_vm86.h"
 #include "opt_xen.h"
 
 #include "assym.h"
@@ -270,16 +268,6 @@ __KERNEL_RCSID(0, "$NetBSD: locore.S,v 1
  */
 	.data
 
-#if NLAPIC > 0
-	.align	PAGE_SIZE
-	.globl	_C_LABEL(local_apic)
-
-	.type	_C_LABEL(local_apic), @object
-LABEL(local_apic)
-	.space	PAGE_SIZE
-END(local_apic)
-#endif
-
 	.globl	_C_LABEL(tablesize)
 	.globl	_C_LABEL(nox_flag)
 	.globl	_C_LABEL(cputype)
@@ -353,11 +341,13 @@ _C_LABEL(Multiboot_Header):
 	jne	1f
 
 	/*
-	 * Indeed, a multiboot-compliant boot loader executed us.  We copy
-	 * the received Multiboot information structure into kernel's data
-	 * space to process it later -- after we are relocated.  It will
-	 * be safer to run complex C code than doing it at this point.
+	 * Indeed, a multiboot-compliant boot loader executed us. We switch
+	 * to the temporary stack, and copy the received Multiboot information
+	 * structure into kernel's data space to process it later -- after we
+	 * are relocated. It will be safer to run complex C code than doing it
+	 * at this point.
 	 */
+	movl	$_RELOC(tmpstk),%esp
 	pushl	%ebx		/* Address of Multiboot information */
 	call	_C_LABEL(multiboot_pre_reloc)
 	addl	$4,%esp
@@ -611,7 +601,7 @@ no_NOX:
  */
 
 	/* Find end of kernel image; brings us on (1). */
-	movl	$RELOC(end),%edi
+	movl	$RELOC(__kernel_end),%edi
 
 #if (NKSYMS || defined(DDB) || defined(MODULAR)) && !defined(makeoptions_COPY_SYMTAB)
 	/* Save the symbols (if loaded); brinds us on (2). */
@@ -643,7 +633,7 @@ no_NOX:
 	incl	%eax		/* one more PTP for VAs stolen by bootstrap */
 1:	movl	%eax,RELOC(nkptp)+1*4
 
-	/* tablesize = (PDP_SIZE + UPAGES + nkptp) << PGSHIFT; */
+	/* tablesize = (PDP_SIZE + UPAGES + nkptp[1]) << PGSHIFT; */
 	addl	$(PDP_SIZE+UPAGES),%eax
 #ifdef PAE
 	incl	%eax 		/* one more page for L3 */
@@ -653,7 +643,8 @@ no_NOX:
 #endif
 	movl	%eax,RELOC(tablesize)
 
-	/* Ensure that nkptp covers BOOTSTRAP TABLES. */
+	/* Ensure that nkptp[1] covers BOOTSTRAP TABLES, ie:
+	 * (esi + tablesize) >> L2_SHIFT + 1 < nkptp[1] */
 	addl	%esi,%eax
 	addl	$~L2_FRAME,%eax
 	shrl	$L2_SHIFT,%eax
@@ -680,7 +671,7 @@ no_NOX:
 	 */
 	leal	(PROC0_PTP1_OFF)(%esi),%ebx
 
-	/* Skip the first MB. */
+	/* Skip the area below the kernel text. */
 	movl	$(KERNTEXTOFF - KERNBASE),%ecx
 	shrl	$PGSHIFT,%ecx
 	fillkpt_blank
@@ -851,24 +842,6 @@ begin:
 	addl	$PDE_SIZE,%esp		/* pop paddr_t */
 	addl	$NGDT*8,%esp		/* pop temporary gdt */
 
-#ifdef SAFARI_FIFO_HACK
-	movb	$5,%al
-	movw	$0x37b,%dx
-	outb	%al,%dx
-	movw	$0x37f,%dx
-	inb	%dx,%al
-	movb	%al,%cl
-
-	orb	$1,%cl
-
-	movb	$5,%al
-	movw	$0x37b,%dx
-	outb	%al,%dx
-	movw	$0x37f,%dx
-	movb	%cl,%al
-	outb	%al,%dx
-#endif /* SAFARI_FIFO_HACK */
-
 	call 	_C_LABEL(main)
 #else /* XEN */
 	/* First, reset the PSL. */
@@ -928,8 +901,8 @@ begin:
 	leal	(USPACE-FRAMESIZE)(%eax),%esp
 	xorl	%ebp,%ebp		/* mark end of frames */
 
-	/* Set first_avail after the UAREA. */
-	addl	$USPACE,%esi
+	/* Set first_avail after the DUMMY PAGE (see xen_locore). */
+	addl	$(USPACE+PAGE_SIZE),%esi
 	subl	$KERNBASE,%esi		/* init386 wants a physical address */
 
 #ifdef PAE
@@ -1248,30 +1221,12 @@ ENTRY(savectx)
 END(savectx)
 
 /*
- * osyscall()
- *
- * Old call gate entry for syscall
- */
-IDTVEC(osyscall)
-#ifndef XEN
-	/* XXX we are in trouble! interrupts be off here. */
-	cli			/* must be first instruction */
-#endif
-	pushfl			/* set eflags in trap frame */
-	popl	8(%esp)
-	orl	$PSL_I,8(%esp)	/* re-enable ints on return to user */
-	pushl	$7		/* size of instruction for restart */
-	jmp	syscall1
-IDTVEC_END(osyscall)
-
-/*
  * syscall()
  *
  * Trap gate entry for syscall
  */
 IDTVEC(syscall)
 	pushl	$2		/* size of instruction for restart */
-syscall1:
 	pushl	$T_ASTFLT	/* trap # for doing ASTs */
 	INTRENTRY
 	STI(%eax)
@@ -1358,39 +1313,6 @@ syscall1:
 	jmp	.Lsyscall_checkast	/* re-check ASTs */
 IDTVEC_END(syscall)
 
-IDTVEC(svr4_fasttrap)
-	pushl	$2		/* size of instruction for restart */
-	pushl	$T_ASTFLT	/* trap # for doing ASTs */
-	INTRENTRY
-	STI(%eax)
-	pushl	$RW_READER
-	pushl	$_C_LABEL(svr4_fasttrap_lock)
-	call	_C_LABEL(rw_enter)
-	addl	$8,%esp
-	call	*_C_LABEL(svr4_fasttrap_vec)
-	pushl	$_C_LABEL(svr4_fasttrap_lock)
-	call	_C_LABEL(rw_exit)
-	addl	$4,%esp
-2:	/* Check for ASTs on exit to user mode. */
-	cli
-	CHECK_ASTPENDING(%eax)
-	je	1f
-	/* Always returning to user mode here. */
-	CLEAR_ASTPENDING(%eax)
-	sti
-	/* Pushed T_ASTFLT into tf_trapno on entry. */
-	pushl	%esp
-	call	_C_LABEL(trap)
-	addl	$4,%esp
-	jmp	2b
-1:	CHECK_DEFERRED_SWITCH
-	jnz	9f
-	INTRFASTEXIT
-9:	sti
-	call	_C_LABEL(pmap_load)
-	cli
-	jmp	2b
-
 /*
  * int npx586bug1(int a, int b)
  * Used when checking for the FDIV bug on first generations pentiums.