[src/trunk]: src/sys/arch/arm/arm32 If possible, use strd to clear .bss

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

details:   https://anonhg.NetBSD.org/src/rev/146b95fda9fa
branches:  trunk
changeset: 787425:146b95fda9fa
user:      matt <matt%NetBSD.org@localhost>
date:      Mon Jun 17 04:41:30 2013 +0000

description:
If possible, use strd to clear .bss

diffstat:

 sys/arch/arm/arm32/locore.S |  20 +++++++++++++-------
 1 files changed, 13 insertions(+), 7 deletions(-)

diffs (49 lines):

diff -r 3b450539f9af -r 146b95fda9fa sys/arch/arm/arm32/locore.S
--- a/sys/arch/arm/arm32/locore.S       Mon Jun 17 04:41:12 2013 +0000
+++ b/sys/arch/arm/arm32/locore.S       Mon Jun 17 04:41:30 2013 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: locore.S,v 1.31 2013/02/27 17:52:44 matt Exp $ */
+/*     $NetBSD: locore.S,v 1.32 2013/06/17 04:41:30 matt Exp $ */
 
 /*
  * Copyright (C) 1994-1997 Mark Brinicombe
@@ -41,7 +41,7 @@
 /* What size should this really be ? It is only used by init_arm() */
 #define INIT_ARM_STACK_SIZE    2048
 
-       RCSID("$NetBSD: locore.S,v 1.31 2013/02/27 17:52:44 matt Exp $")
+       RCSID("$NetBSD: locore.S,v 1.32 2013/06/17 04:41:30 matt Exp $")
 
 /*
  * This is for kvm_mkdb, and should be the address of the beginning
@@ -59,7 +59,6 @@
 
        adr     r1, .Lstart
        ldmia   r1, {r1, r2, r8, sp}    /* Set initial stack and */
-       sub     r2, r2, r1              /* get zero init data and cpu_info_store */
 
 #if defined(TPIDRPRW_IS_CURCPU) || defined(TPIDRPRW_IS_CURLWP)
        mcr     p15, 0, r8, c13, c0, 4
@@ -68,11 +67,18 @@
        ldr     r8, [r8, #L_CPU]        /* r8 needs curcpu in it */
 #endif
 
-       mov     r3, #0
+       mov     r4, #0
+#ifdef _ARM_ARCH_DWORD_OK
+       mov     r5, #0
+#endif
 .L1:
-       str     r3, [r1], #0x0004       /* Zero the bss */
-       subs    r2, r2, #4
-       bgt     .L1
+#ifdef _ARM_ARCH_DWORD_OK
+       strd    r4, [r1], #0x0008       /* Zero the bss */
+#else
+       str     r4, [r1], #0x0004       /* Zero the bss */
+#endif
+       cmp     r1, r2
+       blt     .L1
 
        mrc     p15, 0, r3, c0, c0, 0   /* get our cpuid and save it early */
        str     r3, [r8, #CI_ARM_CPUID]