[src/trunk]: src/sys/arch/sparc64/sparc64 remove the final uses of DATA_START.

[mrg <mrg%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/a598d95fc2a0
branches:  trunk
changeset: 751074:a598d95fc2a0
user:      mrg <mrg%NetBSD.org@localhost>
date:      Sat Jan 23 23:39:27 2010 +0000

description:
remove the final uses of DATA_START.

now we can remove the 16KB space reserved at the start of the data segment,
and i now understand why i wrote this now removed comment 3.5 years ago:
"this shouldn't be needed... but kernel usually hangs without it"

diffstat:

 sys/arch/sparc64/sparc64/locore.s |  20 +-------------------
 1 files changed, 1 insertions(+), 19 deletions(-)

diffs (50 lines):

diff -r c9a6233ef216 -r a598d95fc2a0 sys/arch/sparc64/sparc64/locore.s
--- a/sys/arch/sparc64/sparc64/locore.s Sat Jan 23 23:06:27 2010 +0000
+++ b/sys/arch/sparc64/sparc64/locore.s Sat Jan 23 23:39:27 2010 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: locore.s,v 1.304 2010/01/23 23:06:27 mrg Exp $ */
+/*     $NetBSD: locore.s,v 1.305 2010/01/23 23:39:27 mrg Exp $ */
 
 /*
  * Copyright (c) 1996-2002 Eduardo Horvath
@@ -383,12 +383,6 @@
        .data
        .globl  _C_LABEL(data_start)
 _C_LABEL(data_start):                                  ! Start of data segment
-#define DATA_START     _C_LABEL(data_start)
-
-#if 1
-/* XXX this shouldn't be needed... but kernel usually hangs without it */
-       .space  USPACE
-#endif
 
 #ifdef KGDB
 /*
@@ -1848,13 +1842,7 @@
        set     0x0800000, %g6                          ! 8MB
        sub     %g3, %g7, %g7
        cmp     %g7, %g6
-       sethi   %hi(DATA_START), %g7
-       mov     6, %g6          ! debug
-       stb     %g6, [%g7+0x20] ! debug
        tlu     %xcc, 1; nop
-       blu,pn  %xcc, winfix                            ! Next insn in delay slot is unimportant
-        mov    7, %g6          ! debug
-       stb     %g6, [%g7+0x20] ! debug
 1:     
 #endif
        srlx    %g3, STSHIFT, %g6
@@ -2626,13 +2614,7 @@
        set     0x0800000, %g6                          ! 8MB
        sub     %g3, %g7, %g7
        cmp     %g7, %g6
-       mov     6, %g6          ! debug
-       sethi   %hi(DATA_START), %g7
-       stb     %g6, [%g7+0x30] ! debug
        tlu     %xcc, 1; nop
-       blu,pn  %xcc, textfault                         ! Next insn in delay slot is unimportant
-        mov    7, %g6          ! debug
-       stb     %g6, [%g7+0x30] ! debug
 1:     
 #endif
        srlx    %g3, STSHIFT, %g6