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