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https://github.com/edk2-porting/linux-next.git
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de6b03456e
The compiler get's sometimes to smart and doesn't reread the counter registers and the kernel doesn't schedule until the counter wraps around. Signed-off-by: Chris Zankel <chris@zankel.net>
97 lines
2.4 KiB
C
97 lines
2.4 KiB
C
/*
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* include/asm-xtensa/timex.h
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2001 - 2005 Tensilica Inc.
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*/
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#ifndef _XTENSA_TIMEX_H
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#define _XTENSA_TIMEX_H
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#ifdef __KERNEL__
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#include <asm/processor.h>
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#include <linux/stringify.h>
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#define _INTLEVEL(x) XCHAL_INT ## x ## _LEVEL
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#define INTLEVEL(x) _INTLEVEL(x)
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#if INTLEVEL(XCHAL_TIMER0_INTERRUPT) == 1
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# define LINUX_TIMER 0
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# define LINUX_TIMER_INT XCHAL_TIMER0_INTERRUPT
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#elif INTLEVEL(XCHAL_TIMER1_INTERRUPT) == 1
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# define LINUX_TIMER 1
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# define LINUX_TIMER_INT XCHAL_TIMER1_INTERRUPT
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#elif INTLEVEL(XCHAL_TIMER2_INTERRUPT) == 1
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# define LINUX_TIMER 2
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# define LINUX_TIMER_INT XCHAL_TIMER2_INTERRUPT
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#else
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# error "Bad timer number for Linux configurations!"
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#endif
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#define LINUX_TIMER_MASK (1L << LINUX_TIMER_INT)
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#define CLOCK_TICK_RATE 1193180 /* (everyone is using this value) */
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#define CLOCK_TICK_FACTOR 20 /* Factor of both 10^6 and CLOCK_TICK_RATE */
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#ifdef CONFIG_XTENSA_CALIBRATE_CCOUNT
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extern unsigned long ccount_per_jiffy;
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extern unsigned long ccount_nsec;
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#define CCOUNT_PER_JIFFY ccount_per_jiffy
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#define NSEC_PER_CCOUNT ccount_nsec
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#else
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#define CCOUNT_PER_JIFFY (CONFIG_XTENSA_CPU_CLOCK*(1000000UL/HZ))
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#define NSEC_PER_CCOUNT (1000UL / CONFIG_XTENSA_CPU_CLOCK)
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#endif
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typedef unsigned long long cycles_t;
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/*
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* Only used for SMP.
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*/
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extern cycles_t cacheflush_time;
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#define get_cycles() (0)
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/*
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* Register access.
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*/
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#define WSR_CCOUNT(r) asm volatile ("wsr %0,"__stringify(CCOUNT) :: "a" (r))
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#define RSR_CCOUNT(r) asm volatile ("rsr %0,"__stringify(CCOUNT) : "=a" (r))
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#define WSR_CCOMPARE(x,r) asm volatile ("wsr %0,"__stringify(CCOMPARE)"+"__stringify(x) :: "a"(r))
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#define RSR_CCOMPARE(x,r) asm volatile ("rsr %0,"__stringify(CCOMPARE)"+"__stringify(x) : "=a"(r))
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static inline unsigned long get_ccount (void)
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{
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unsigned long ccount;
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RSR_CCOUNT(ccount);
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return ccount;
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}
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static inline void set_ccount (unsigned long ccount)
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{
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WSR_CCOUNT(ccount);
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}
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static inline unsigned long get_linux_timer (void)
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{
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unsigned ccompare;
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RSR_CCOMPARE(LINUX_TIMER, ccompare);
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return ccompare;
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}
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static inline void set_linux_timer (unsigned long ccompare)
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{
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WSR_CCOMPARE(LINUX_TIMER, ccompare);
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}
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#endif /* __KERNEL__ */
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#endif /* _XTENSA_TIMEX_H */
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