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/*
* linux/include/asm-arm/arch-ebsa110/system.h
*
* Copyright (C) 1996-2000 Russell King.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef __ASM_ARCH_SYSTEM_H
#define __ASM_ARCH_SYSTEM_H
/*
* EBSA110 idling methodology:
*
* We can not execute the "wait for interrupt" instruction since that
* will stop our MCLK signal (which provides the clock for the glue
* logic, and therefore the timer interrupt).
*
* Instead, we spin, waiting for either hlt_counter or need_resched
* to be set. If we have been spinning for 2cs, then we drop the
* core clock down to the memory clock.
*/
static void arch_idle(void)
{
unsigned long start_idle;
start_idle = jiffies;
do {
if (current->need_resched || hlt_counter)
goto slow_out;
} while (time_before(jiffies, start_idle + HZ/50));
cpu_do_idle(IDLE_CLOCK_SLOW);
while (!current->need_resched && !hlt_counter) {
/* do nothing slowly */
}
cpu_do_idle(IDLE_CLOCK_FAST);
slow_out:
}
#define arch_reset(mode) cpu_reset(0x80000000)
#endif
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