diff options
Diffstat (limited to 'bsps/powerpc/qoriq/mpci/lock.S')
| -rw-r--r-- | bsps/powerpc/qoriq/mpci/lock.S | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/bsps/powerpc/qoriq/mpci/lock.S b/bsps/powerpc/qoriq/mpci/lock.S new file mode 100644 index 0000000000..c6e72a7533 --- /dev/null +++ b/bsps/powerpc/qoriq/mpci/lock.S @@ -0,0 +1,52 @@ +/** + * @file + * + * @ingroup QorIQInterCom + * + * @brief qoriq_spin_lock() and qoriq_spin_unlock() implementation. + */ + +/* + * Copyright (c) 2011 embedded brains GmbH. All rights reserved. + * + * embedded brains GmbH + * Obere Lagerstr. 30 + * 82178 Puchheim + * Germany + * <rtems@embedded-brains.de> + * + * The license and distribution terms for this file may be + * found in the file LICENSE in this distribution or at + * http://www.rtems.org/license/LICENSE. + */ + +#include <libcpu/powerpc-utility.h> + + .global qoriq_spin_lock + .global qoriq_spin_unlock + +qoriq_spin_lock: + li r0, 1 + mfmsr r4 + GET_INTERRUPT_MASK r5 + andc r5, r4, r5 + b 2f +1: + mtmsr r4 +2: + lwarx r6, r0, r3 + cmpwi r6, 0 + bne 2b + mtmsr r5 + stwcx. r0, r0, r3 + bne 1b + isync + mr r3, r4 + blr + +qoriq_spin_unlock: + msync + li r0, 0 + stw r0, 0(r3) + mtmsr r4 + blr |