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51 lines (42 loc) · 1.34 KB
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/* ----------------------------------------------------------------------- *
*
* Copyright 2008 H. Peter Anvin - All Rights Reserved
* Copyright 2009-2010 Intel Corporation; author: H. Peter Anvin
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston MA 02110-1301, USA; either version 2 of the License, or
* (at your option) any later version; incorporated herein by reference.
*
* ----------------------------------------------------------------------- */
/*
* idle.c:
*
* This function provided protected-mode access to the idle handling.
* It needs to be carefully coordinated with idle.inc, which provides
* idle services to real-mode code.
*/
#include "core.h"
#include <x86/cpu.h>
#define TICKS_TO_IDLE 4 /* Also in idle.inc */
static jiffies_t _IdleTimer;
__export uint16_t NoHalt = 0;
int (*idle_hook_func)(void);
void reset_idle(void)
{
_IdleTimer = jiffies();
sti(); /* Guard against BIOS/PXE brokenness... */
}
__export void __idle(void)
{
if (jiffies() - _IdleTimer < TICKS_TO_IDLE)
return;
if (idle_hook_func && idle_hook_func())
return; /* Nonzero return = do not idle */
sti();
if (NoHalt)
cpu_relax();
else
hlt();
}