Module: xenomai-2.5
Branch: master
Commit: 8e59e3be96a87022d06e222bb7256ce338f90bcc
URL:
http://git.xenomai.org/?p=xenomai-2.5.git;a=commit;h=8e59e3be96a87022d06e222bb7256ce338f90bcc
Author: Philippe Gerum <r...@xenomai.org>
Date: Sun Oct 31 12:28:34 2010 +0100
hal/blackfin: remove redundant stack clean up
---
include/asm-blackfin/bits/pod.h | 23 ++++++++++++-----------
1 files changed, 12 insertions(+), 11 deletions(-)
diff --git a/include/asm-blackfin/bits/pod.h b/include/asm-blackfin/bits/pod.h
index 9feda93..2ad4584 100644
--- a/include/asm-blackfin/bits/pod.h
+++ b/include/asm-blackfin/bits/pod.h
@@ -138,17 +138,18 @@ static inline void xnarch_init_thread(xnarchtcb_t * tcb,
int imask,
struct xnthread *thread, char *name)
{
- unsigned long *ksp;
+ unsigned long ksp, *switchregs;
- ksp =
- (unsigned long
- *)(((unsigned long)tcb->stackbase + tcb->stacksize - 40) & ~0xf);
- ksp[0] = (unsigned long)tcb; /* r0 */
- memset(&ksp[1], 0, sizeof(long) * 7); /* ( R7:4, P5:3 ) */
- ksp[8] = 0; /* fp */
- ksp[9] = (unsigned long)&xnarch_thread_trampoline; /* rets */
+ ksp = (((unsigned long)tcb->stackbase + tcb->stacksize - 40) & ~0xf);
+ switchregs = (unsigned long *)ksp;
+ /*
+ * Stack space is guaranteed to be clear, so R7:4, P5:3, fp
+ * are already zero. We only need to set r0 and rets.
+ */
+ switchregs[0] = (unsigned long)tcb; /* r0 */
+ switchregs[9] = (unsigned long)&xnarch_thread_trampoline; /* rets */
- tcb->ts.ksp = (unsigned long)ksp;
+ tcb->ts.ksp = ksp;
tcb->ts.pc = (unsigned long)&rthal_thread_trampoline;
tcb->ts.usp = 0;
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