1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
98 lines
1.9 KiB
C
98 lines
1.9 KiB
C
#ifndef _ASM_IA64_DELAY_H
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#define _ASM_IA64_DELAY_H
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/*
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* Delay routines using a pre-computed "cycles/usec" value.
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*
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* Copyright (C) 1998, 1999 Hewlett-Packard Co
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* David Mosberger-Tang <davidm@hpl.hp.com>
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* Copyright (C) 1999 VA Linux Systems
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* Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
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* Copyright (C) 1999 Asit Mallick <asit.k.mallick@intel.com>
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* Copyright (C) 1999 Don Dugger <don.dugger@intel.com>
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*/
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#include <linux/config.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/compiler.h>
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#include <asm/intrinsics.h>
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#include <asm/processor.h>
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static __inline__ void
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ia64_set_itm (unsigned long val)
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{
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ia64_setreg(_IA64_REG_CR_ITM, val);
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ia64_srlz_d();
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}
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static __inline__ unsigned long
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ia64_get_itm (void)
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{
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unsigned long result;
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result = ia64_getreg(_IA64_REG_CR_ITM);
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ia64_srlz_d();
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return result;
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}
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static __inline__ void
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ia64_set_itv (unsigned long val)
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{
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ia64_setreg(_IA64_REG_CR_ITV, val);
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ia64_srlz_d();
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}
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static __inline__ unsigned long
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ia64_get_itv (void)
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{
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return ia64_getreg(_IA64_REG_CR_ITV);
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}
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static __inline__ void
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ia64_set_itc (unsigned long val)
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{
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ia64_setreg(_IA64_REG_AR_ITC, val);
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ia64_srlz_d();
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}
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static __inline__ unsigned long
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ia64_get_itc (void)
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{
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unsigned long result;
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result = ia64_getreg(_IA64_REG_AR_ITC);
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ia64_barrier();
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#ifdef CONFIG_ITANIUM
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while (unlikely((__s32) result == -1)) {
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result = ia64_getreg(_IA64_REG_AR_ITC);
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ia64_barrier();
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}
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#endif
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return result;
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}
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extern void ia64_delay_loop (unsigned long loops);
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static __inline__ void
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__delay (unsigned long loops)
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{
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if (unlikely(loops < 1))
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return;
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ia64_delay_loop (loops - 1);
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}
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static __inline__ void
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udelay (unsigned long usecs)
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{
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unsigned long start = ia64_get_itc();
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unsigned long cycles = usecs*local_cpu_data->cyc_per_usec;
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while (ia64_get_itc() - start < cycles)
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cpu_relax();
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}
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#endif /* _ASM_IA64_DELAY_H */
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