/
clock.c
1250 lines (1001 loc) · 36.6 KB
/
clock.c
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/* CLOCK.C (c) Copyright Jan Jaeger, 2000-2012 */
/* TOD Clock functions */
/* The emulated hardware clock is based on the host clock, adjusted */
/* by means of an offset and a steering rate. */
/*
Hercules Clock and Timer Formats
64-bit Clock/Timer Format
+------------------------------+--+
| | |
+------------------------------+--+
0 59 63
128-bit Clock Format
+------------------------------+--+------------------------------+
| | | |
+------------------------------+--+------------------------------+
0 59 63 127
where:
- Bit-59 represents one microsecond
- Bit-63 represents 62.5 nanoseconds
Usage Notes:
- Bits 0-63 of the 64-bit clock format are identical to bits 0-63
of the 128-bit clock format
- The 128-bit clock format extends the 64-bit clock format by an
additional 64-bits to the right (low-order) of the 64-bit clock
format.
- Hercules timers only use the 64-bit clock/timer format.
- The Hercules clock format has a period of over 36,533 years.
- With masking, the 128-bit clock format may be used for extended TOD clock
operations.
- The ETOD2TOD() call may be used to convert a Hercules 128-bit clock value
to a standard TOD clock value.
*/
#include "hstdinc.h"
#if !defined(_HENGINE_DLL_)
#define _HENGINE_DLL_
#endif
#include "hercules.h"
#include "opcode.h"
#include "inline.h"
#include "sr.h"
#if !defined(_CLOCK_C_)
#define _CLOCK_C_
#include "clock.h"
/*----------------------------------------------------------------------------*/
/* Define clock_gettime for systems not supporting nanosecond clocks, */
/* other than Windows. */
/*----------------------------------------------------------------------------*/
#if !defined(_MSVC_) && !defined(CLOCK_REALTIME)
typedef int clockid_t;
/* IDs for various POSIX.1b interval timers and system clocks */
#define CLOCK_REALTIME 0
#define CLOCK_MONOTONIC 1
#define CLOCK_PROCESS_CPUTIME_ID 2
#define CLOCK_THREAD_CPUTIME_ID 3
#define CLOCK_MONOTONIC_RAW 4
#define CLOCK_REALTIME_COARSE 5
#define CLOCK_MONOTONIC_COARSE 6
#define CLOCK_BOOTTIME 7
#define CLOCK_REALTIME_ALARM 8
#define CLOCK_BOOTTIME_ALARM 9
static INLINE int
clock_gettime ( clockid_t clk_id, struct timespec *ts )
{
register int result;
/* Validate parameters... */
if ( unlikely ( (clk_id > CLOCK_REALTIME) ||
!ts ) )
{
errno = EINVAL;
return ( -1 );
}
#if defined(__APPLE__) && 0
{
/* FIXME: mach/mach.h include is generating invalid storage
* class errors. Default to gettimeofday until resolved.
*/
#include <mach/mach.h>
/* FIXME: This sequence is slower than gettimeofday call per OS
* X Developer Library. Recommend converting to use the
* mach_absolute_time call, but that will have to wait
* until CLOCK_MONOTONIC support and review of steering
* support to avoid double steering.
*/
mach_timespec_t mts;
static clock_serv_t cserv = 0;
if (!cserv)
{
/* Get clock service port */
result = host_get_clock_service(mach_host_self(),
CALENDAR_CLOCK,
&cserv);
if (result != KERN_SUCCESS)
return ( result );
}
result = clock_get_time(cserv, &mts);
if (result == KERN_SUCCESS)
{
ts->tv_sec = mts.tv_sec;
ts->tv_nsec = mts.tv_nsec;
}
// result = mach_port_deallocate(mach_task_self(), cserv); /* Can this be ignored until shutdown of Hercules? */
}
#else /* Convert standard gettimeofday call */
{
struct timeval tv;
result = gettimeofday(&tv, NULL);
/* Handle microsecond overflow */
if ( unlikely (tv.tv_usec >= 1000000) )
{
register U32 temp = tv.tv_usec / 1000000;
tv.tv_sec += temp;
tv.tv_usec -= temp * 1000000;
}
/* Convert timeval to timespec */
ts->tv_sec = tv.tv_sec;
ts->tv_nsec = tv.tv_usec * 1000;
/* Reset clock precision and force host_ETOD to use minimum
* precision algorithm.
*/
#if defined(TOD_FULL_PRECISION)
#undef TOD_FULL_PRECISION
#endif
#if defined(TOD_120BIT_PRECISION)
#undef TOD_120BIT_PRECISION
#endif
#if defined(TOD_95BIT_PRECISION)
#undef TOD_95BIT_PRECISION)
#endif
#if defined(TOD_64BIT_PRECISION)
#undef TOD_64BIT_PRECISION)
#endif
#if !defined(TOD_MIN_PRECISION)
#define TOD_MIN_PRECISION
#endif
}
#endif
return ( result );
}
#elif !(defined(TOD_FULL_PRECISION) || \
defined(TOD_120BIT_PRECISION) || \
defined(TOD_64BIT_PRECISION) || \
defined(TOD_MIN_PRECISION) || \
defined(TOD_95BIT_PRECISION))
/* Define default clock precision as 95-bits (only one division required) */
#define TOD_95BIT_PRECISION
#endif
/*----------------------------------------------------------------------------*/
/* host_ETOD - Primary high-resolution clock fetch and conversion */
/*----------------------------------------------------------------------------*/
ETOD*
host_ETOD (ETOD* ETOD)
{
struct timespec time;
/* Should use CLOCK_MONOTONIC + adjustment, but host sleep/hibernate
* destroys consistent monotonic clock.
*/
clock_gettime(CLOCK_REALTIME, &time);
/* This conversion, assuming a nanosecond host clock resolution,
* yields a TOD clock resolution of 120-bits, 95-bits, or 64-bits,
* with a period of over 36,533 years.
*
*
* Original 128-bit code:
*
* register U128 result;
* result = ((((U128)time.tvsec * ETOD_SEC) + ETOD_1970) << 64) +
* (((U128)time.tv_nsec << 68) / 1000);
*
*
* In the 64-bit translation of the routine, bits 121-127 are not
* calculated as a third division is required.
*
* It is not necessary to normalize the clock_gettime return value,
* ensuring that the tv_nsec field is less than 1 second, as tv_nsec
* is a 32-bit field and 64-bit registers are in use.
*
*/
ETOD->high = time.tv_sec; /* Convert seconds to microseconds, */
ETOD->high *= ETOD_SEC; /* adjusted to bit-59; truncate above */
/* extended TOD clock resolution */
ETOD->high += ETOD_1970; /* Adjust for open source epoch of 1970 */
ETOD->low = time.tv_nsec; /* Copy nanoseconds */
#if defined(TOD_FULL_PRECISION) || \
defined(TOD_120BIT_PRECISION) || \
defined(TOD_64BIT_PRECISION) || \
defined(TOD_MIN_PRECISION) || \
!defined(TOD_95BIT_PRECISION)
{
register U64 temp;
temp = ETOD->low; /* Adjust nanoseconds to bit-59 for */
temp <<= 1; /* division by 1000 (shift compressed), */
temp /= 125; /* calculating microseconds and the top */
/* nibble of the remainder */
/* (us*16 = ns*16/1000 = ns*2/125) */
ETOD->high += temp; /* Add to upper 64-bits */
#if defined(TOD_MIN_PRECISION) || \
defined(TOD_64BIT_PRECISION)
ETOD->low = 0; /* Set lower 64-bits to zero */
/* (gettimeofday or other microsecond */
/* clock used as clock source) */
#else /* Calculate full precision fractional clock value */
temp >>= 1; /* Calculate remainder */
temp *= 125; /* ... */
ETOD->low -= temp; /* ... */
ETOD->low <<= 57; /* Divide remainder by 1000 and adjust */
ETOD->low /= 125; /* to proper position, shifting out high- */
ETOD->low <<= 8; /* order byte */
#endif
}
#else /* 95-bit resolution */
{
ETOD->low <<= 32; /* Place nanoseconds in high-order word */
ETOD->low /= 125; /* Divide by 1000 (125 * 2^3) */
ETOD->high += ETOD->low >> 31; /* Adjust and add microseconds and */
/* first nibble of nanosecond remainder */
/* to bits 0-63 */
ETOD->low <<= 33; /* Adjust remaining nanosecond fraction */
/* to bits 64-93 */
}
#endif
return ( ETOD ); /* Return address of result */
}
// static int clock_state = CC_CLOCK_SET;
static CSR episode_old;
static CSR episode_new;
static CSR *episode_current = &episode_new;
void csr_reset()
{
episode_new.start_time = 0;
episode_new.base_offset = 0;
episode_new.fine_s_rate = 0;
episode_new.gross_s_rate = 0;
episode_current = &episode_new;
episode_old = episode_new;
}
static ETOD universal_tod;
static TOD universal_clock(void) /* really: any clock used as a base */
{
host_ETOD(&universal_tod);
return (universal_tod.high);
}
static TOD universal_clock_extended(ETOD* ETOD)
{
host_ETOD(ETOD);
return (ETOD->high);
}
/* The hercules hardware clock, based on the universal clock, but */
/* running at its own speed as optionally set by set_tod_steering() */
/* The hardware clock returns a unique value */
static double hw_steering = 0.0; /* Current TOD clock steering rate */
static TOD hw_episode; /* TOD of start of steering episode */
static S64 hw_offset = 0; /* Current offset between TOD and HW */
// static ETOD hw_tod = {0, 0}; /* Globally defined in clock.h */
static ETOD hw_unique_clock_tick = {0, 0};
static TOD hw_adjust(TOD base_tod);
static TOD
hw_calculate_unique_tick (void)
{
static const ETOD m1 = ETOD_init(0,65536);
ETOD temp;
register TOD result;
register int n;
temp.high = universal_tod.high;
temp.low = universal_tod.low;
hw_unique_clock_tick.low = 1;
for (n = 0; n < 65536; ++n)
result = hw_adjust(universal_clock());
ETOD_sub(&temp, universal_tod, temp);
ETOD_sub(&temp, temp, m1);
ETOD_shift(&hw_unique_clock_tick, temp, 16);
if (hw_unique_clock_tick.low == 0 &&
hw_unique_clock_tick.high == 0)
hw_unique_clock_tick.high = 1;
#if defined(TOD_95BIT_PRECISION) || \
defined(TOD_64BIT_PRECISION) || \
defined(TOD_MIN_PRECISION)
else
{
static const ETOD adj =
#if defined(TOD_95BIT_PRECISION)
ETOD_init(0,0x0000000100000000ULL);
#else
ETOD_init(0,0x8000000000000000ULL);
#endif
ETOD_add(&hw_unique_clock_tick, hw_unique_clock_tick, adj);
#if defined(TOD_95BIT_PRECISION)
hw_unique_clock_tick.low &= 0xFFFFFFFE00000000ULL;
#else
hw_unique_clock_tick.low = 0;
#endif
}
#endif
return ( result );
}
static TOD hw_adjust(TOD base_tod)
{
/* Apply hardware offset, this is the offset achieved by all
previous steering episodes */
base_tod += hw_offset;
/* Apply the steering offset from the current steering episode */
/* TODO: Shift resolution to permit adjustment by less than 62.5
* nanosecond increments (1/16 microsecond).
*/
base_tod += (S64)(base_tod - hw_episode) * hw_steering;
/* Ensure that the clock returns a unique value */
if (hw_tod.high < base_tod)
hw_tod.high = base_tod,
hw_tod.low = universal_tod.low;
else if (hw_unique_clock_tick.low == 0 &&
hw_unique_clock_tick.high == 0)
hw_calculate_unique_tick();
else
ETOD_add(&hw_tod, hw_tod, hw_unique_clock_tick);
return ( hw_tod.high );
}
static TOD hw_clock_l(void)
{
/* Get time of day (GMT); adjust speed and ensure uniqueness */
return ( hw_adjust(universal_clock()) );
}
TOD hw_clock(void)
{
register TOD temp_tod;
obtain_lock(&sysblk.todlock);
/* Get time of day (GMT); adjust speed and ensure uniqueness */
temp_tod = hw_clock_l();
release_lock(&sysblk.todlock);
return (temp_tod);
}
/* set_tod_steering(double) sets a new steering rate. */
/* When a new steering episode begins, the offset is adjusted, */
/* and the new steering rate takes effect */
void set_tod_steering(double steering)
{
obtain_lock(&sysblk.todlock);
/* Get current offset between hw_adjust and universal TOD value */
hw_offset = hw_clock_l() - universal_tod.high;
hw_episode = hw_tod.high;
hw_steering = steering;
release_lock(&sysblk.todlock);
}
/* Start a new episode */
static INLINE void start_new_episode()
{
hw_offset = hw_tod.high - universal_tod.high;
hw_episode = hw_tod.high;
episode_new.start_time = hw_episode;
/* TODO: Convert to binary arithmetic to avoid floating point conversions */
hw_steering = ldexp(2,-44) *
(S32)(episode_new.fine_s_rate + episode_new.gross_s_rate);
episode_current = &episode_new;
}
/* Prepare for a new episode */
static INLINE void prepare_new_episode()
{
if(episode_current == &episode_new)
{
episode_old = episode_new;
episode_current = &episode_old;
}
}
/* Ajust the epoch for all active cpu's in the configuration */
static U64 adjust_epoch_cpu_all(U64 epoch)
{
int cpu;
/* Update the TOD clock of all CPU's in the configuration
as we simulate 1 shared TOD clock, and do not support the
TOD clock sync check */
for (cpu = 0; cpu < sysblk.maxcpu; cpu++)
{
obtain_lock(&sysblk.cpulock[cpu]);
if (IS_CPU_ONLINE(cpu))
sysblk.regs[cpu]->tod_epoch = epoch;
release_lock(&sysblk.cpulock[cpu]);
}
return epoch;
}
double get_tod_steering(void)
{
return hw_steering;
}
void set_tod_epoch(S64 epoch)
{
obtain_lock(&sysblk.todlock);
csr_reset();
tod_epoch = epoch;
release_lock(&sysblk.todlock);
adjust_epoch_cpu_all(epoch);
}
void adjust_tod_epoch(S64 epoch)
{
obtain_lock(&sysblk.todlock);
csr_reset();
tod_epoch += epoch;
release_lock(&sysblk.todlock);
adjust_epoch_cpu_all(tod_epoch);
}
void set_tod_clock(U64 tod)
{
set_tod_epoch(tod - hw_clock());
}
S64 get_tod_epoch()
{
return tod_epoch;
}
static void set_gross_steering_rate(S32 gsr)
{
obtain_lock(&sysblk.todlock);
prepare_new_episode();
episode_new.gross_s_rate = gsr;
release_lock(&sysblk.todlock);
}
static void set_fine_steering_rate(S32 fsr)
{
obtain_lock(&sysblk.todlock);
prepare_new_episode();
episode_new.fine_s_rate = fsr;
release_lock(&sysblk.todlock);
}
static void set_tod_offset(S64 offset)
{
obtain_lock(&sysblk.todlock);
prepare_new_episode();
episode_new.base_offset = offset;
release_lock(&sysblk.todlock);
}
static void adjust_tod_offset(S64 offset)
{
obtain_lock(&sysblk.todlock);
prepare_new_episode();
episode_new.base_offset = episode_old.base_offset + offset;
release_lock(&sysblk.todlock);
}
/* The cpu timer is internally kept as an offset to the hw_clock()
* the cpu timer counts down as the clock approaches the timer epoch
*/
void set_cpu_timer(REGS *regs, S64 timer)
{
regs->cpu_timer = (timer >> 8) + hw_clock();
}
S64 cpu_timer(REGS *regs)
{
S64 timer;
timer = (regs->cpu_timer - hw_clock()) << 8;
return timer;
}
TOD etod_clock(REGS *regs, ETOD* ETOD, ETOD_format format)
{
/* STORE CLOCK and STORE CLOCK EXTENDED values must be in ascending
* order for comparison. Consequently, swap delays for a subsequent
* STORE CLOCK, STORE CLOCK EXTENDED, or TRACE instruction may be
* introduced when a STORE CLOCK value is advanced due to the use of
* the CPU address in bits 66-71.
*
* If the regs pointer is null, then the request is a raw request,
* and the format operand should specify ETOD_raw or ETOD_fast. For
* raw and fast requests, the CPU address is not inserted into the
* returned value.
*
* A spin loop is used for the introduction of the delay, moderated
* by obtaining and releasing of the TOD lock. This permits raw and
* fast clock requests to complete without additional delay.
*/
U64 high;
U64 low;
U8 swapped = 0;
do
{
obtain_lock(&sysblk.todlock);
high = hw_clock_l();
low = hw_tod.low;
/* If we are in the old episode, and the new episode has arrived
* then we must take action to start the new episode.
*/
if (episode_current == &episode_old)
start_new_episode();
/* Set the clock to the new updated value with offset applied */
high += episode_current->base_offset;
/* Place CPU stamp into clock value for Standard and Extended
* formats (raw or fast requests fall through)
*/
if (regs)
{
register U64 cpuad;
register U64 amask;
register U64 lmask;
/* Set CPU address masks */
if (sysblk.maxcpu <= 64)
amask = 0x3F, lmask = 0xFFFFFFFFFFC00000ULL;
else if (sysblk.maxcpu <= 128)
amask = 0x7F, lmask = 0xFFFFFFFFFF800000ULL;
else /* sysblk.maxcpu <= 256) */
amask = 0xFF, lmask = 0xFFFFFFFFFF000000ULL;
/* Clean CPU address */
cpuad = (U64)regs->cpuad & amask;
switch (format)
{
/* Standard TOD format */
case ETOD_standard:
low &= lmask << 40;
low |= cpuad << 56;
break;
/* Extended TOD format */
case ETOD_extended:
low &= lmask;
low |= cpuad << 16;
if (low == 0)
low = (amask + 1) << 16;
low |= regs->todpr;
break;
}
}
if (/* New clock value > Old clock value */
high > tod_value.high ||
(high == tod_value.high &&
low > tod_value.low) ||
/* or Clock Wrap */
unlikely(unlikely((tod_value.high & 0x8000000000000000ULL) == 0x8000000000000000ULL &&
( high & 0x8000000000000000ULL) == 0)))
{
tod_value.high = high;
tod_value.low = low;
swapped = 1;
}
else if (format <= ETOD_fast)
{
high = tod_value.high;
low = tod_value.low;
swapped = 1;
}
if (swapped)
{
ETOD->high = high += regs->tod_epoch;
ETOD->low = low;
}
release_lock(&sysblk.todlock);
} while (!swapped);
return ( high );
}
TOD
tod_clock (REGS* regs)
{
ETOD ETOD;
return ( etod_clock(regs, &ETOD, ETOD_fast) );
}
#if defined(_FEATURE_INTERVAL_TIMER)
#if defined(_FEATURE_ECPSVM)
static INLINE S32 ecps_vtimer(REGS *regs)
{
return (S32)TOD_TO_ITIMER((S64)(regs->ecps_vtimer - hw_clock()));
}
static INLINE void set_ecps_vtimer(REGS *regs, S32 vtimer)
{
regs->ecps_vtimer = (U64)(hw_clock() + ITIMER_TO_TOD(vtimer));
regs->ecps_oldtmr = vtimer;
}
#endif /*defined(_FEATURE_ECPSVM)*/
static INLINE S32 int_timer(REGS *regs)
{
return (S32)TOD_TO_ITIMER((S64)(regs->int_timer - hw_clock()));
}
void set_int_timer(REGS *regs, S32 itimer)
{
regs->int_timer = (U64)(hw_clock() + ITIMER_TO_TOD(itimer));
regs->old_timer = itimer;
}
int chk_int_timer(REGS *regs)
{
S32 itimer;
int pending = 0;
itimer = int_timer(regs);
if(itimer < 0 && regs->old_timer >= 0)
{
ON_IC_ITIMER(regs);
pending = 1;
regs->old_timer=itimer;
}
#if defined(_FEATURE_ECPSVM)
if(regs->ecps_vtmrpt)
{
itimer = ecps_vtimer(regs);
if(itimer < 0 && regs->ecps_oldtmr >= 0)
{
ON_IC_ECPSVTIMER(regs);
pending += 2;
}
}
#endif /*defined(_FEATURE_ECPSVM)*/
return pending;
}
#endif /*defined(_FEATURE_INTERVAL_TIMER)*/
/*
* is_leapyear ( year )
*
* Returns:
*
* 0 - Specified year is NOT a leap year
* 1 - Specified year is a leap year
*
*
* Algorithm:
*
* if year modulo 400 is 0 then
* is_leap_year
* else if year modulo 100 is 0 then
* not_leap_year
* else if year modulo 4 is 0 then
* is_leap_year
* else
* not_leap_year
*
*
* Notes and Restrictions:
*
* 1) In reality, only valid for years 1582 and later. 1582 was the
* first year of Gregorian calendar; actual years are dependent upon
* year of acceptance by any given government and/or agency. For
* example, Britain and the British empire did not adopt the
* calendar until 1752; Alaska did not adopt the calendar until
* 1867. For our purposes however year 0 is treated as a leap year.
*
* 2) Minimum validity period for algorithm is 3,300 years after 1582
* (4882), at which point the calendar may be off by one full day.
*
* 3) Most likely invalid for years after 8000 due to unpredictability
* in the earth's long-time rotational changes.
*
*
* References:
*
* http://scienceworld.wolfram.com/astronomy/LeapYear.html
* http://www.timeanddate.com/date/leapyear.html
* http://www.usno.navy.mil/USNO/astronomical-applications/
* astronomical-information-center/leap-years
* http://en.wikipedia.org/wiki/Leap_year
* http://en.wikipedia.org/wiki/0_(year)
* http://en.wikipedia.org/wiki/1_BC
* http://en.wikipedia.org/wiki/Proleptic_calendar
* http://en.wikipedia.org/wiki/Proleptic_Julian_calendar
* http://en.wikipedia.org/wiki/Proleptic_Gregorian_calendar
* http://dotat.at/tmp/ISO_8601-2004_E.pdf
* http://tools.ietf.org/html/rfc3339
*
*/
static INLINE unsigned int
is_leapyear ( const unsigned int year )
{
return (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0));
}
static INLINE S64 lyear_adjust(int epoch)
{
int year, leapyear;
TOD tod = hw_clock();
if(tod >= TOD_YEAR)
{
tod -= TOD_YEAR;
year = (tod / TOD_4YEARS * 4) + 1;
tod %= TOD_4YEARS;
if((leapyear = tod / TOD_YEAR) == 4)
year--;
year += leapyear;
}
else
year = 0;
if(epoch > 0)
return ( ((!is_leapyear(year)) && (((year % 4) - (epoch % 4)) <= 0)) ? -TOD_DAY : 0 );
else
return ( ((is_leapyear(year) && (-epoch % 4) != 0) || ((year % 4) + (-epoch % 4) > 4)) ? TOD_DAY : 0 );
}
int default_epoch = 1900;
int default_yroffset = 0;
int default_tzoffset = 0;
static INLINE void configure_time()
{
int epoch;
S64 ly1960;
/* Set up the system TOD clock offset: compute the number of
* microseconds offset to 0000 GMT, 1 January 1900.
*/
if( (epoch = default_epoch) == 1960 )
ly1960 = ETOD_DAY;
else
ly1960 = 0;
epoch -= 1900 + default_yroffset;
set_tod_epoch(((epoch*365+(epoch/4))*-ETOD_DAY)+lyear_adjust(epoch)+ly1960);
/* Set the timezone offset */
adjust_tod_epoch((((default_tzoffset / 100) * 60) + /* Hours -> Minutes */
(default_tzoffset % 100)) * /* Minutes */
ETOD_MIN); /* Convert to ETOD format */
}
/*-------------------------------------------------------------------*/
/* epoch 1900|1960 */
/*-------------------------------------------------------------------*/
int configure_epoch(int epoch)
{
if(epoch != 1900 && epoch != 1960)
return -1;
default_epoch = epoch;
configure_time();
return 0;
}
/*-------------------------------------------------------------------*/
/* yroffset +|-142 */
/*-------------------------------------------------------------------*/
int configure_yroffset(int yroffset)
{
if(yroffset < -142 || yroffset > 142)
return -1;
default_yroffset = yroffset;
configure_time();
return 0;
}
/*-------------------------------------------------------------------*/
/* tzoffset -2359..+2359 */
/*-------------------------------------------------------------------*/
int configure_tzoffset(int tzoffset)
{
if(tzoffset < -2359 || tzoffset > 2359)
return -1;
default_tzoffset = tzoffset;
configure_time();
return 0;
}
/*-------------------------------------------------------------------*/
/* Query current tzoffset value for reporting */
/*-------------------------------------------------------------------*/
int query_tzoffset(void)
{
return default_tzoffset;
}
/*-------------------------------------------------------------------*/
/* Update TOD clock */
/* */
/* This function updates the TOD clock. */
/* */
/* This function is called by timer_update_thread and by cpu_thread */
/* instructions that manipulate any of the timer related entities */
/* (clock comparator, cpu timer and interval timer). */
/* */
/* Internal function `check_timer_event' is called which will signal */
/* any timer related interrupts to the appropriate cpu_thread. */
/* */
/* Callers *must* own the todlock and *must not* own the intlock. */
/* */
/* update_tod_clock() returns the tod delta, by which the cpu timer */
/* has been adjusted. */
/* */
/*-------------------------------------------------------------------*/
// static ETOD tod_value;
TOD update_tod_clock(void)
{
TOD new_clock;
obtain_lock(&sysblk.todlock);
new_clock = hw_clock_l();
/* If we are in the old episode, and the new episode has arrived
then we must take action to start the new episode */
if (episode_current == &episode_old)
start_new_episode();
/* Set the clock to the new updated value with offset applied */
new_clock += episode_current->base_offset;
tod_value.high = new_clock;
tod_value.low = hw_tod.low;
release_lock(&sysblk.todlock);
/* Update the timers and check if either a clock related event has
become pending */
update_cpu_timer();
return new_clock;
}
#define SR_SYS_CLOCK_CURRENT_CSR ( SR_SYS_CLOCK | 0x001 )
#define SR_SYS_CLOCK_UNIVERSAL_TOD ( SR_SYS_CLOCK | 0x002 )
#define SR_SYS_CLOCK_HW_STEERING ( SR_SYS_CLOCK | 0x004 )
#define SR_SYS_CLOCK_HW_EPISODE ( SR_SYS_CLOCK | 0x005 )
#define SR_SYS_CLOCK_HW_OFFSET ( SR_SYS_CLOCK | 0x006 )
#define SR_SYS_CLOCK_OLD_CSR ( SR_SYS_CLOCK | 0x100 )
#define SR_SYS_CLOCK_OLD_CSR_START_TIME ( SR_SYS_CLOCK | 0x101 )
#define SR_SYS_CLOCK_OLD_CSR_BASE_OFFSET ( SR_SYS_CLOCK | 0x102 )
#define SR_SYS_CLOCK_OLD_CSR_FINE_S_RATE ( SR_SYS_CLOCK | 0x103 )
#define SR_SYS_CLOCK_OLD_CSR_GROSS_S_RATE ( SR_SYS_CLOCK | 0x104 )
#define SR_SYS_CLOCK_NEW_CSR ( SR_SYS_CLOCK | 0x200 )
#define SR_SYS_CLOCK_NEW_CSR_START_TIME ( SR_SYS_CLOCK | 0x201 )
#define SR_SYS_CLOCK_NEW_CSR_BASE_OFFSET ( SR_SYS_CLOCK | 0x202 )
#define SR_SYS_CLOCK_NEW_CSR_FINE_S_RATE ( SR_SYS_CLOCK | 0x203 )
#define SR_SYS_CLOCK_NEW_CSR_GROSS_S_RATE ( SR_SYS_CLOCK | 0x204 )
int clock_hsuspend(void *file)
{
int i;
char buf[SR_MAX_STRING_LENGTH];
i = (episode_current == &episode_new);
SR_WRITE_VALUE(file, SR_SYS_CLOCK_CURRENT_CSR, i, sizeof(i));
SR_WRITE_VALUE(file, SR_SYS_CLOCK_UNIVERSAL_TOD, universal_tod.high, sizeof(universal_tod.high));
MSGBUF(buf, "%f", hw_steering);
SR_WRITE_STRING(file, SR_SYS_CLOCK_HW_STEERING, buf);
SR_WRITE_VALUE(file, SR_SYS_CLOCK_HW_EPISODE, hw_episode, sizeof(hw_episode));
SR_WRITE_VALUE(file, SR_SYS_CLOCK_HW_OFFSET, hw_offset, sizeof(hw_offset));
SR_WRITE_VALUE(file, SR_SYS_CLOCK_OLD_CSR_START_TIME, episode_old.start_time, sizeof(episode_old.start_time));
SR_WRITE_VALUE(file, SR_SYS_CLOCK_OLD_CSR_BASE_OFFSET, episode_old.base_offset, sizeof(episode_old.base_offset));
SR_WRITE_VALUE(file, SR_SYS_CLOCK_OLD_CSR_FINE_S_RATE, episode_old.fine_s_rate, sizeof(episode_old.fine_s_rate));
SR_WRITE_VALUE(file, SR_SYS_CLOCK_OLD_CSR_GROSS_S_RATE, episode_old.gross_s_rate, sizeof(episode_old.gross_s_rate));