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/*- * Copyright (c) 2000, 2001 Benno Rice * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * $FreeBSD: release/9.1.0/sys/powerpc/powerpc/atomic.S 231907 2012-02-19 08:58:31Z andreast $ */ #include <machine/asm.h> .text ASENTRY_NOPROF(atomic_set_8) 0: lwarx 0, 0, 3 /* load old value */ slwi 4, 4, 24 /* shift the byte so it's in the right place */ or 0, 0, 4 /* generate new value */ stwcx. 0, 0, 3 /* attempt to store */ bne- 0 /* loop if failed */ eieio /* synchronise */ sync blr /* return */ ASENTRY_NOPROF(atomic_clear_8) 0: lwarx 0, 0, 3 /* load old value */ slwi 4, 4, 24 /* shift the byte so it's in the right place */ andc 0, 0, 4 /* generate new value */ stwcx. 0, 0, 3 /* attempt to store */ bne- 0 /* loop if failed */ eieio /* synchronise */ sync blr /* return */ ASENTRY_NOPROF(atomic_add_8) 0: lwarx 9, 0, 3 /* load old value */ srwi 0, 9, 24 /* byte alignment */ add 0, 4, 0 /* calculate new value */ slwi 0, 9, 24 /* byte alignment */ clrlwi 9, 9, 8 /* clear the byte in the original word */ or 9, 9, 0 /* copy back in to the original word */ stwcx. 9, 0, 3 /* attempt to store */ bne- 0 /* loop if failed */ eieio /* synchronise */ sync blr /* return */ ASENTRY_NOPROF(atomic_subtract_8) 0: lwarx 9, 0, 3 /* load old value */ srwi 0, 9, 24 /* byte alignment */ subf 0, 4, 0 /* calculate new value */ slwi 0, 9, 24 /* byte alignment */ clrlwi 9, 9, 8 /* clear the byte in the original word */ or 9, 9, 0 /* copy back in to the original word */ stwcx. 9, 0, 3 /* attempt to store */ bne- 0 /* loop if failed */ eieio /* synchronise */ sync blr /* return */ ASENTRY_NOPROF(atomic_set_16) li 11, 3 /* mask to test for alignment */ andc. 11, 3, 11 /* force address to be word-aligned */ 0: lwarx 12, 0, 11 /* load old value */ bne 1f /* no realignment needed if it's aligned */ slwi 4, 4, 16 /* realign operand */ 1: or 12, 12, 4 /* calculate new value */ stwcx. 12, 0, 11 /* attempt to store */ bne- 0b /* loop if failed */ eieio /* synchronise */ sync blr /* return */ ASENTRY_NOPROF(atomic_clear_16) li 11, 3 /* mask to test for alignment */ andc. 11, 3, 11 /* force address to be word-aligned */ 0: lwarx 12, 0, 11 /* load old value */ bne 1f /* no realignment needed if it's aligned */ slwi 4, 4, 16 /* realign operand */ 1: andc 12, 12, 4 /* calculate new value */ stwcx. 12, 0, 11 /* attempt to store */ bne- 0b /* loop if failed */ eieio /* synchronise */ sync blr /* return */ ASENTRY_NOPROF(atomic_add_16) li 11, 3 /* mask to test for alignment */ andc. 11, 3, 11 /* force address to be word-aligned */ 0: lwarx 12, 0, 11 /* load old value */ bne 1f /* no realignment needed if it's aligned */ srwi 12, 9, 16 /* realign */ 1: add 12, 4, 12 /* calculate new value */ bne 2f /* no realignment needed if it's aligned */ slwi 12, 12, 16 /* realign */ 2: clrlwi 9, 9, 16 /* clear old value */ or 9, 9, 12 /* copy in new value */ stwcx. 12, 0, 11 /* attempt to store */ bne- 0b /* loop if failed */ eieio /* synchronise */ sync blr /* return */ ASENTRY_NOPROF(atomic_subtract_16) li 11, 3 /* mask to test for alignment */ andc. 11, 3, 11 /* force address to be word-aligned */ 0: lwarx 12, 0, 11 /* load old value */ bne 1f /* no realignment needed if it's aligned */ srwi 12, 9, 16 /* realign */ 1: subf 12, 4, 12 /* calculate new value */ bne 2f /* no realignment needed if it's aligned */ slwi 12, 12, 16 /* realign */ 2: clrlwi 9, 9, 16 /* clear old value */ or 9, 9, 12 /* copy in new value */ stwcx. 12, 0, 11 /* attempt to store */ bne- 0 /* loop if failed */ eieio /* synchronise */ sync blr /* return */