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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
*/
#ifndef _SYS_MACHCLOCK_H
#define _SYS_MACHCLOCK_H
#ifdef __cplusplus
extern "C" {
#endif
#ifdef _ASM
/*
* Macro to clear the NPT (non-privileged trap) bit in the %tick/%stick
* register. Uses %g1-%g4.
*/
#define CLEARTICKNPT \
sethi %hi(cpu_clearticknpt), %g1; \
jmp %g1 + %lo(cpu_clearticknpt); \
rd %pc, %g4
#define RD_TICK_NO_SUSPEND_CHECK(out, scr1) \
rdpr %tick, out; \
sllx out, 1, out; \
srlx out, 1, out;
#define RD_TICK(out, scr1, scr2, label) \
RD_TICK_NO_SUSPEND_CHECK(out, scr1);
/*
* These macros on sun4u read the %tick register, due to :
* - %stick does not have enough precision, it's very low frequency
* - %stick accesses are very slow on UltraSPARC IIe
* Instead, consumers read %tick and scale it by the current stick/tick ratio.
* This only works because all cpus in a system change clock ratios
* synchronously and the changes are all initiated by the kernel.
*/
#define RD_CLOCK_TICK(out, scr1, scr2, label) \
/* CSTYLED */ \
RD_TICK(out,scr1,scr2,label)
#define RD_CLOCK_TICK_NO_SUSPEND_CHECK(out, scr1) \
/* CSTYLED */ \
RD_TICK_NO_SUSPEND_CHECK(out,scr1)
#endif /* _ASM */
#if defined(CPU_MODULE)
/*
* Constants used to convert hi-res timestamps into nanoseconds
* (see <sys/clock.h> file for more information)
*/
#if defined(CHEETAH) || defined(HUMMINGBIRD) || defined(OLYMPUS_C)
/*
* At least 3.9MHz, for slower %stick-based systems.
*/
#define NSEC_SHIFT 8
#elif defined(SPITFIRE)
/*
* At least 62.5 MHz, for faster %tick-based systems.
*/
#define NSEC_SHIFT 4
#define VTRACE_SHIFT 4
#else
#error "Compiling for CPU_MODULE but no CPU specified"
#endif
/*
* NOTE: the macros below assume that the various time-related variables
* (hrestime, hrestime_adj, hres_last_tick, timedelta, nsec_scale, etc)
* are all stored together on a 64-byte boundary. The primary motivation
* is cache performance, but we also take advantage of a convenient side
* effect: these variables all have the same high 22 address bits, so only
* one sethi is needed to access them all.
*/
/*
* GET_HRESTIME() returns the value of hrestime, hrestime_adj and the
* number of nanoseconds since the last clock tick ('nslt'). It also
* sets 'nano' to the value NANOSEC (one billion).
*
* This macro assumes that all registers are globals or outs so they can
* safely contain 64-bit data, and that it's safe to use the label "5:".
* Further, this macro calls the NATIVE_TIME_TO_NSEC_SCALE which in turn
* uses the labels "6:" and "7:"; labels "5:", "6:" and "7:" must not
* be used across invocations of this macro.
*/
#define GET_HRESTIME(hrestsec, hrestnsec, adj, nslt, nano, scr, hrlock, \
gnt1, gnt2) \
5: sethi %hi(hres_lock), scr; \
lduw [scr + %lo(hres_lock)], hrlock; /* load clock lock */ \
lduw [scr + %lo(nsec_scale)], nano; /* tick-to-ns factor */ \
andn hrlock, 1, hrlock; /* see comments above! */ \
ldx [scr + %lo(hres_last_tick)], nslt; \
ldn [scr + %lo(hrestime)], hrestsec; /* load hrestime.sec */\
add scr, %lo(hrestime), hrestnsec; \
ldn [hrestnsec + CLONGSIZE], hrestnsec; \
GET_NATIVE_TIME(adj, gnt1, gnt2); /* get current %tick */ \
subcc adj, nslt, nslt; /* nslt = ticks since last clockint */ \
movneg %xcc, %g0, nslt; /* ignore neg delta from tick skew */ \
ldx [scr + %lo(hrestime_adj)], adj; /* load hrestime_adj */ \
/* membar #LoadLoad; (see comment (2) above) */ \
lduw [scr + %lo(hres_lock)], scr; /* load clock lock */ \
NATIVE_TIME_TO_NSEC_SCALE(nslt, nano, gnt1, NSEC_SHIFT); \
sethi %hi(NANOSEC), nano; \
xor hrlock, scr, scr; \
/* CSTYLED */ \
brnz,pn scr, 5b; \
or nano, %lo(NANOSEC), nano;
/*
* Similar to above, but returns current gethrtime() value in 'base'.
*/
#define GET_HRTIME(base, now, nslt, scale, scr, hrlock, gnt1, gnt2) \
5: sethi %hi(hres_lock), scr; \
lduw [scr + %lo(hres_lock)], hrlock; /* load clock lock */ \
lduw [scr + %lo(nsec_scale)], scale; /* tick-to-ns factor */ \
andn hrlock, 1, hrlock; /* see comments above! */ \
ldx [scr + %lo(hres_last_tick)], nslt; \
ldx [scr + %lo(hrtime_base)], base; /* load hrtime_base */ \
GET_NATIVE_TIME(now, gnt1, gnt2); /* get current %tick */ \
subcc now, nslt, nslt; /* nslt = ticks since last clockint */ \
movneg %xcc, %g0, nslt; /* ignore neg delta from tick skew */ \
/* membar #LoadLoad; (see comment (2) above) */ \
ld [scr + %lo(hres_lock)], scr; /* load clock lock */ \
NATIVE_TIME_TO_NSEC_SCALE(nslt, scale, gnt1, NSEC_SHIFT); \
xor hrlock, scr, scr; \
/* CSTYLED */ \
brnz,pn scr, 5b; \
add base, nslt, base;
#endif /* CPU_MODULE */
#ifndef _ASM
#ifdef _KERNEL
/*
* Hardware watchdog variables and knobs
*/
#define CLK_WATCHDOG_DEFAULT 10 /* 10 seconds */
extern int watchdog_enable;
extern int watchdog_available;
extern int watchdog_activated;
extern uint_t watchdog_timeout_seconds;
/*
* tod module name and operations
*/
struct tod_ops {
timestruc_t (*tod_get)(void);
void (*tod_set)(timestruc_t);
uint_t (*tod_set_watchdog_timer)(uint_t);
uint_t (*tod_clear_watchdog_timer)(void);
void (*tod_set_power_alarm)(timestruc_t);
void (*tod_clear_power_alarm)(void);
uint64_t (*tod_get_cpufrequency)(void);
};
extern struct tod_ops tod_ops;
extern char *tod_module_name;
extern uint64_t gettick_counter(void);
#define CLOCK_TICK_COUNTER() gettick_counter()
/*
* These defines allow common code to use TOD functions independant
* of hardware platform.
*/
#define TODOP_GET(top) ((top).tod_get())
#define TODOP_SET(top, ts) ((top).tod_set(ts))
#define TODOP_SETWD(top, nsec) ((top).tod_set_watchdog_timer(nsec))
#define TODOP_CLRWD(top) ((top).tod_clear_watchdog_timer())
#define TODOP_SETWAKE(top, ts) ((top).tod_set_power_alarm(ts))
#define TODOP_CLRWAKE(top) ((top).tod_clear_power_alarm())
#endif /* _KERNEL */
#endif /* _ASM */
#ifdef __cplusplus
}
#endif
#endif /* !_SYS_MACHCLOCK_H */
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