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authorPaul Mundt <lethal@linux-sh.org>2008-12-17 15:33:43 +0900
committerPaul Mundt <lethal@linux-sh.org>2008-12-22 18:44:47 +0900
commit740a3e677b70181d5e2b1458a27891209e3bf635 (patch)
tree9b5de2213f9a6ca036398bbc411a9982444d4351 /arch/sh/kernel
parent8a655053ca1593dd160dac2a4ee638fdec037d86 (diff)
sh: Enable skipping of bss on debug platforms for sh32 also.
This enables the same functionality that sh64 has for sh32. When running on simulated hardware or via remote memory via the debug interface, memory is gauranteed to be zero on boot already, and skipping the zeroing of BSS has measurable boot time benefits. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh/kernel')
-rw-r--r--arch/sh/kernel/head_32.S12
1 files changed, 10 insertions, 2 deletions
diff --git a/arch/sh/kernel/head_32.S b/arch/sh/kernel/head_32.S
index ae0a382a82e..788605ff708 100644
--- a/arch/sh/kernel/head_32.S
+++ b/arch/sh/kernel/head_32.S
@@ -80,8 +80,14 @@ ENTRY(_stext)
mov.l 7f, r0
ldc r0, r7_bank ! ... and initial thread_info
#endif
-
- ! Clear BSS area
+
+#ifndef CONFIG_SH_NO_BSS_INIT
+ /*
+ * Don't clear BSS if running on slow platforms such as an RTL simulation,
+ * remote memory via SHdebug link, etc. For these the memory can be guaranteed
+ * to be all zero on boot anyway.
+ */
+ ! Clear BSS area
#ifdef CONFIG_SMP
mov.l 3f, r0
cmp/eq #0, r0 ! skip clear if set to zero
@@ -97,6 +103,8 @@ ENTRY(_stext)
mov.l r0,@-r2
10:
+#endif
+
! Additional CPU initialization
mov.l 6f, r0
jsr @r0