linux-vybrid_public/arch/arm/mach-msm/idle.S

/* arch/arm/mach-msm/include/mach/idle.S
 *
 * Idle processing for MSM7K - work around bugs with SWFI.
 *
 * Copyright (c) 2007 QUALCOMM Incorporated.
 * Copyright (C) 2007 Google, Inc. 
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 */ 
		
#include <linux/linkage.h>
#include <asm/assembler.h>

ENTRY(arch_idle)
#ifdef CONFIG_MSM7X00A_IDLE
	mrc     p15, 0, r1, c1, c0, 0    /* read current CR    */
	bic     r0, r1, #(1 << 2)        /* clear dcache bit   */
	bic     r0, r0, #(1 << 12)       /* clear icache bit   */
	mcr     p15, 0, r0, c1, c0, 0    /* disable d/i cache  */

	mov     r0, #0                   /* prepare wfi value  */
	mcr     p15, 0, r0, c7, c10, 0   /* flush the cache    */
	mcr     p15, 0, r0, c7, c10, 4   /* memory barrier     */
	mcr     p15, 0, r0, c7, c0, 4    /* wait for interrupt */

	mcr     p15, 0, r1, c1, c0, 0    /* restore d/i cache  */
#endif
	mov     pc, lr