mirror of https://gitee.com/openkylin/linux.git
35 lines
1.0 KiB
C
35 lines
1.0 KiB
C
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#ifndef _ASM_POWERPC_DELAY_H
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#define _ASM_POWERPC_DELAY_H
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#ifdef __KERNEL__
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/*
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* Copyright 1996, Paul Mackerras.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* PPC64 Support added by Dave Engebretsen, Todd Inglett, Mike Corrigan,
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* Anton Blanchard.
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*/
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extern void __delay(unsigned long loops);
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extern void udelay(unsigned long usecs);
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/*
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* On shared processor machines the generic implementation of mdelay can
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* result in large errors. While each iteration of the loop inside mdelay
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* is supposed to take 1ms, the hypervisor could sleep our partition for
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* longer (eg 10ms). With the right timing these errors can add up.
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*
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* Since there is no 32bit overflow issue on 64bit kernels, just call
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* udelay directly.
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*/
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#ifdef CONFIG_PPC64
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#define mdelay(n) udelay((n) * 1000)
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#endif
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#endif /* __KERNEL__ */
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#endif /* _ASM_POWERPC_DELAY_H */
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