1 #ifndef _ASM_IA64_DELAY_H
2 #define _ASM_IA64_DELAY_H
5 * Delay routines using a pre-computed "cycles/usec" value.
7 * Copyright (C) 1998, 1999 Hewlett-Packard Co
8 * David Mosberger-Tang <davidm@hpl.hp.com>
9 * Copyright (C) 1999 VA Linux Systems
10 * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
11 * Copyright (C) 1999 Asit Mallick <asit.k.mallick@intel.com>
12 * Copyright (C) 1999 Don Dugger <don.dugger@intel.com>
15 #include <linux/config.h>
16 #include <linux/kernel.h>
17 #include <linux/sched.h>
18 #include <linux/compiler.h>
20 #include <asm/intrinsics.h>
21 #include <asm/processor.h>
23 static __inline__ void
24 ia64_set_itm (unsigned long val)
26 ia64_setreg(_IA64_REG_CR_ITM, val);
30 static __inline__ unsigned long
35 result = ia64_getreg(_IA64_REG_CR_ITM);
40 static __inline__ void
41 ia64_set_itv (unsigned long val)
43 ia64_setreg(_IA64_REG_CR_ITV, val);
47 static __inline__ void
48 ia64_set_itc (unsigned long val)
50 ia64_setreg(_IA64_REG_AR_ITC, val);
54 static __inline__ unsigned long
59 result = ia64_getreg(_IA64_REG_AR_ITC);
62 while (unlikely((__s32) result == -1)) {
63 result = ia64_getreg(_IA64_REG_AR_ITC);
70 extern void ia64_delay_loop (unsigned long loops);
72 static __inline__ void
73 __delay (unsigned long loops)
75 if (unlikely(loops < 1))
78 ia64_delay_loop (loops - 1);
81 static __inline__ void
82 udelay (unsigned long usecs)
84 unsigned long start = ia64_get_itc();
85 unsigned long cycles = usecs*local_cpu_data->cyc_per_usec;
87 while (ia64_get_itc() - start < cycles)
91 #endif /* _ASM_IA64_DELAY_H */