xref: /illumos-gate/usr/src/uts/i86pc/os/mp_machdep.c (revision 3db86aab)

/*
 * 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 2006 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident	"%Z%%M%	%I%	%E% SMI"

#define	PSMI_1_5
#include <sys/smp_impldefs.h>
#include <sys/psm.h>
#include <sys/psm_modctl.h>
#include <sys/pit.h>
#include <sys/cmn_err.h>
#include <sys/strlog.h>
#include <sys/clock.h>
#include <sys/debug.h>
#include <sys/rtc.h>
#include <sys/x86_archext.h>
#include <sys/cpupart.h>
#include <sys/cpuvar.h>
#include <sys/chip.h>
#include <sys/disp.h>
#include <sys/cpu.h>
#include <sys/archsystm.h>
#include <sys/mach_intr.h>

#define	OFFSETOF(s, m)		(size_t)(&(((s *)0)->m))

/*
 *	Local function prototypes
 */
static int mp_disable_intr(processorid_t cpun);
static void mp_enable_intr(processorid_t cpun);
static void mach_init();
static void mach_picinit();
static uint64_t mach_calchz(uint32_t pit_counter, uint64_t *processor_clks);
static int machhztomhz(uint64_t cpu_freq_hz);
static uint64_t mach_getcpufreq(void);
static void mach_fixcpufreq(void);
static int mach_clkinit(int, int *);
static void mach_smpinit(void);
static void mach_set_softintr(int ipl, struct av_softinfo *);
static void mach_cpu_start(int cpun);
static int mach_softlvl_to_vect(int ipl);
static void mach_get_platform(int owner);
static void mach_construct_info();
static int mach_translate_irq(dev_info_t *dip, int irqno);
static int mach_intr_ops(dev_info_t *, ddi_intr_handle_impl_t *,
    psm_intr_op_t, int *);
static timestruc_t mach_tod_get(void);
static void mach_tod_set(timestruc_t ts);
static void mach_notify_error(int level, char *errmsg);
static hrtime_t dummy_hrtime(void);
static void dummy_scalehrtime(hrtime_t *);
static void cpu_halt(void);
static void cpu_wakeup(cpu_t *, int);
/*
 *	External reference functions
 */
extern void return_instr();
extern timestruc_t (*todgetf)(void);
extern void (*todsetf)(timestruc_t);
extern long gmt_lag;
extern uint64_t freq_tsc(uint32_t *);
#if defined(__i386)
extern uint64_t freq_notsc(uint32_t *);
#endif
extern void pc_gethrestime(timestruc_t *);

/*
 *	PSM functions initialization
 */
void (*psm_shutdownf)(int, int)	= return_instr;
void (*psm_preshutdownf)(int, int) = return_instr;
void (*psm_notifyf)(int)	= return_instr;
void (*psm_set_idle_cpuf)(int)	= return_instr;
void (*psm_unset_idle_cpuf)(int) = return_instr;
void (*psminitf)()		= mach_init;
void (*picinitf)() 		= return_instr;
int (*clkinitf)(int, int *) 	= (int (*)(int, int *))return_instr;
void (*cpu_startf)() 		= return_instr;
int (*ap_mlsetup)() 		= (int (*)(void))return_instr;
void (*send_dirintf)() 		= return_instr;
void (*setspl)(int)		= return_instr;
int (*addspl)(int, int, int, int) = (int (*)(int, int, int, int))return_instr;
int (*delspl)(int, int, int, int) = (int (*)(int, int, int, int))return_instr;
void (*setsoftint)(int, struct av_softinfo *)=
	(void (*)(int, struct av_softinfo *))return_instr;
int (*slvltovect)(int)		= (int (*)(int))return_instr;
int (*setlvl)(int, int *)	= (int (*)(int, int *))return_instr;
void (*setlvlx)(int, int)	= (void (*)(int, int))return_instr;
int (*psm_disable_intr)(int)	= mp_disable_intr;
void (*psm_enable_intr)(int)	= mp_enable_intr;
hrtime_t (*gethrtimef)(void)	= dummy_hrtime;
hrtime_t (*gethrtimeunscaledf)(void)	= dummy_hrtime;
void (*scalehrtimef)(hrtime_t *)	= dummy_scalehrtime;
int (*psm_translate_irq)(dev_info_t *, int) = mach_translate_irq;
void (*gethrestimef)(timestruc_t *) = pc_gethrestime;
int (*psm_todgetf)(todinfo_t *) = (int (*)(todinfo_t *))return_instr;
int (*psm_todsetf)(todinfo_t *) = (int (*)(todinfo_t *))return_instr;
void (*psm_notify_error)(int, char *) = (void (*)(int, char *))NULL;
int (*psm_get_clockirq)(int) = NULL;
int (*psm_get_ipivect)(int, int) = NULL;

int (*psm_clkinit)(int) = NULL;
void (*psm_timer_reprogram)(hrtime_t) = NULL;
void (*psm_timer_enable)(void) = NULL;
void (*psm_timer_disable)(void) = NULL;
void (*psm_post_cyclic_setup)(void *arg) = NULL;
int (*psm_intr_ops)(dev_info_t *, ddi_intr_handle_impl_t *, psm_intr_op_t,
    int *) = mach_intr_ops;

void (*notify_error)(int, char *) = (void (*)(int, char *))return_instr;
void (*hrtime_tick)(void)	= return_instr;

int tsc_gethrtime_enable = 1;
int tsc_gethrtime_initted = 0;

/*
 * Local Static Data
 */
static struct psm_ops mach_ops;
static struct psm_ops *mach_set[4] = {&mach_ops, NULL, NULL, NULL};
static ushort_t mach_ver[4] = {0, 0, 0, 0};

/*
 * If non-zero, idle cpus will "halted" when there's
 * no work to do.
 */
int	halt_idle_cpus = 1;

#if defined(__amd64)
/*
 * If non-zero, will use cr8 for interrupt priority masking
 * We declare this here since install_spl is called from here
 * (where this is checked).
 */
int	intpri_use_cr8 = 0;
#endif	/* __amd64 */

#ifdef	_SIMULATOR_SUPPORT

int simulator_run = 0;	/* patch to non-zero if running under simics */

#endif	/* _SIMULATOR_SUPPORT */

/* ARGSUSED */
void
chip_plat_define_chip(cpu_t *cp, chip_def_t *cd)
{
	if ((x86_feature & (X86_HTT|X86_CMP)) == X86_HTT) {
		/*
		 * Single-core Pentiums with Hyper-Threading enabled.
		 */
		cd->chipd_type = CHIP_SMT;
	} else if ((x86_feature & (X86_HTT|X86_CMP)) == X86_CMP) {
		/*
		 * Multi-core Opterons or Multi-core Pentiums with
		 * Hyper-Threading disabled.
		 */
		cd->chipd_type = CHIP_CMP_SPLIT_CACHE;
	} else if ((x86_feature & (X86_HTT|X86_CMP)) == (X86_HTT|X86_CMP)) {
		/*
		 * Multi-core Pentiums with Hyper-Threading enabled.
		 */
		cd->chipd_type = CHIP_CMT;
	} else {
		/*
		 * Single-core/single-threaded chips.
		 */
		cd->chipd_type = CHIP_DEFAULT;
	}

	cd->chipd_rechoose_adj = 0;
	cd->chipd_nosteal = 100000ULL; /* 100 usec */
}

/*
 * Routine to ensure initial callers to hrtime gets 0 as return
 */
static hrtime_t
dummy_hrtime(void)
{
	return (0);
}

/* ARGSUSED */
static void
dummy_scalehrtime(hrtime_t *ticks)
{}

/*
 * Halt the present CPU until awoken via an interrupt
 */
static void
cpu_halt(void)
{
	cpu_t		*cpup = CPU;
	processorid_t	cpun = cpup->cpu_id;
	cpupart_t	*cp = cpup->cpu_part;
	int		hset_update = 1;

	/*
	 * If this CPU is online, and there's multiple CPUs
	 * in the system, then we should notate our halting
	 * by adding ourselves to the partition's halted CPU
	 * bitmap. This allows other CPUs to find/awaken us when
	 * work becomes available.
	 */
	if (cpup->cpu_flags & CPU_OFFLINE || ncpus == 1)
		hset_update = 0;

	/*
	 * Add ourselves to the partition's halted CPUs bitmask
	 * and set our HALTED flag, if necessary.
	 *
	 * When a thread becomes runnable, it is placed on the queue
	 * and then the halted cpuset is checked to determine who
	 * (if anyone) should be awoken. We therefore need to first
	 * add ourselves to the halted cpuset, and and then check if there
	 * is any work available.
	 *
	 * Note that memory barriers after updating the HALTED flag
	 * are not necessary since an atomic operation (updating the bitmap)
	 * immediately follows. On x86 the atomic operation acts as a
	 * memory barrier for the update of cpu_disp_flags.
	 */
	if (hset_update) {
		cpup->cpu_disp_flags |= CPU_DISP_HALTED;
		CPUSET_ATOMIC_ADD(cp->cp_haltset, cpun);
	}

	/*
	 * Check to make sure there's really nothing to do.
	 * Work destined for this CPU may become available after
	 * this check. We'll be notified through the clearing of our
	 * bit in the halted CPU bitmask, and a poke.
	 */
	if (disp_anywork()) {
		if (hset_update) {
			cpup->cpu_disp_flags &= ~CPU_DISP_HALTED;
			CPUSET_ATOMIC_DEL(cp->cp_haltset, cpun);
		}
		return;
	}

	/*
	 * We're on our way to being halted.
	 *
	 * Disable interrupts now, so that we'll awaken immediately
	 * after halting if someone tries to poke us between now and
	 * the time we actually halt.
	 *
	 * We check for the presence of our bit after disabling interrupts.
	 * If it's cleared, we'll return. If the bit is cleared after
	 * we check then the poke will pop us out of the halted state.
	 *
	 * This means that the ordering of the poke and the clearing
	 * of the bit by cpu_wakeup is important.
	 * cpu_wakeup() must clear, then poke.
	 * cpu_halt() must disable interrupts, then check for the bit.
	 */
	cli();

	if (hset_update && !CPU_IN_SET(cp->cp_haltset, cpun)) {
		cpup->cpu_disp_flags &= ~CPU_DISP_HALTED;
		sti();
		return;
	}

	/*
	 * The check for anything locally runnable is here for performance
	 * and isn't needed for correctness. disp_nrunnable ought to be
	 * in our cache still, so it's inexpensive to check, and if there
	 * is anything runnable we won't have to wait for the poke.
	 */
	if (cpup->cpu_disp->disp_nrunnable != 0) {
		if (hset_update) {
			cpup->cpu_disp_flags &= ~CPU_DISP_HALTED;
			CPUSET_ATOMIC_DEL(cp->cp_haltset, cpun);
		}
		sti();
		return;
	}

	/*
	 * Call the halt sequence:
	 * sti
	 * hlt
	 */
	i86_halt();

	/*
	 * We're no longer halted
	 */
	if (hset_update) {
		cpup->cpu_disp_flags &= ~CPU_DISP_HALTED;
		CPUSET_ATOMIC_DEL(cp->cp_haltset, cpun);
	}
}


/*
 * If "cpu" is halted, then wake it up clearing its halted bit in advance.
 * Otherwise, see if other CPUs in the cpu partition are halted and need to
 * be woken up so that they can steal the thread we placed on this CPU.
 * This function is only used on MP systems.
 */
static void
cpu_wakeup(cpu_t *cpu, int bound)
{
	uint_t		cpu_found;
	int		result;
	cpupart_t	*cp;

	cp = cpu->cpu_part;
	if (CPU_IN_SET(cp->cp_haltset, cpu->cpu_id)) {
		/*
		 * Clear the halted bit for that CPU since it will be
		 * poked in a moment.
		 */
		CPUSET_ATOMIC_DEL(cp->cp_haltset, cpu->cpu_id);
		/*
		 * We may find the current CPU present in the halted cpuset
		 * if we're in the context of an interrupt that occurred
		 * before we had a chance to clear our bit in cpu_halt().
		 * Poking ourself is obviously unnecessary, since if
		 * we're here, we're not halted.
		 */
		if (cpu != CPU)
			poke_cpu(cpu->cpu_id);
		return;
	} else {
		/*
		 * This cpu isn't halted, but it's idle or undergoing a
		 * context switch. No need to awaken anyone else.
		 */
		if (cpu->cpu_thread == cpu->cpu_idle_thread ||
		    cpu->cpu_disp_flags & CPU_DISP_DONTSTEAL)
			return;
	}

	/*
	 * No need to wake up other CPUs if the thread we just enqueued
	 * is bound.
	 */
	if (bound)
		return;


	/*
	 * See if there's any other halted CPUs. If there are, then
	 * select one, and awaken it.
	 * It's possible that after we find a CPU, somebody else
	 * will awaken it before we get the chance.
	 * In that case, look again.
	 */
	do {
		CPUSET_FIND(cp->cp_haltset, cpu_found);
		if (cpu_found == CPUSET_NOTINSET)
			return;

		ASSERT(cpu_found >= 0 && cpu_found < NCPU);
		CPUSET_ATOMIC_XDEL(cp->cp_haltset, cpu_found, result);
	} while (result < 0);

	if (cpu_found != CPU->cpu_id)
		poke_cpu(cpu_found);
}

static int
mp_disable_intr(int cpun)
{
	/*
	 * switch to the offline cpu
	 */
	affinity_set(cpun);
	/*
	 * raise ipl to just below cross call
	 */
	splx(XC_MED_PIL-1);
	/*
	 *	set base spl to prevent the next swtch to idle from
	 *	lowering back to ipl 0
	 */
	CPU->cpu_intr_actv |= (1 << (XC_MED_PIL-1));
	set_base_spl();
	affinity_clear();
	return (DDI_SUCCESS);
}

static void
mp_enable_intr(int cpun)
{
	/*
	 * switch to the online cpu
	 */
	affinity_set(cpun);
	/*
	 * clear the interrupt active mask
	 */
	CPU->cpu_intr_actv &= ~(1 << (XC_MED_PIL-1));
	set_base_spl();
	(void) spl0();
	affinity_clear();
}

static void
mach_get_platform(int owner)
{
	void		**srv_opsp;
	void		**clt_opsp;
	int		i;
	int		total_ops;

	/* fix up psm ops */
	srv_opsp = (void **)mach_set[0];
	clt_opsp = (void **)mach_set[owner];
	if (mach_ver[owner] == (ushort_t)PSM_INFO_VER01)
		total_ops = sizeof (struct psm_ops_ver01) /
				sizeof (void (*)(void));
	else if (mach_ver[owner] == (ushort_t)PSM_INFO_VER01_1)
		/* no psm_notify_func */
		total_ops = OFFSETOF(struct psm_ops, psm_notify_func) /
		    sizeof (void (*)(void));
	else if (mach_ver[owner] == (ushort_t)PSM_INFO_VER01_2)
		/* no psm_timer funcs */
		total_ops = OFFSETOF(struct psm_ops, psm_timer_reprogram) /
		    sizeof (void (*)(void));
	else if (mach_ver[owner] == (ushort_t)PSM_INFO_VER01_3)
		/* no psm_preshutdown function */
		total_ops = OFFSETOF(struct psm_ops, psm_preshutdown) /
		    sizeof (void (*)(void));
	else if (mach_ver[owner] == (ushort_t)PSM_INFO_VER01_4)
		/* no psm_preshutdown function */
		total_ops = OFFSETOF(struct psm_ops, psm_intr_ops) /
		    sizeof (void (*)(void));
	else
		total_ops = sizeof (struct psm_ops) / sizeof (void (*)(void));

	/*
	 * Save the version of the PSM module, in case we need to
	 * bahave differently based on version.
	 */
	mach_ver[0] = mach_ver[owner];

	for (i = 0; i < total_ops; i++)
		if (clt_opsp[i] != NULL)
			srv_opsp[i] = clt_opsp[i];
}

static void
mach_construct_info()
{
	register struct psm_sw *swp;
	int	mach_cnt[PSM_OWN_OVERRIDE+1] = {0};
	int	conflict_owner = 0;

	if (psmsw->psw_forw == psmsw)
		panic("No valid PSM modules found");
	mutex_enter(&psmsw_lock);
	for (swp = psmsw->psw_forw; swp != psmsw; swp = swp->psw_forw) {
		if (!(swp->psw_flag & PSM_MOD_IDENTIFY))
			continue;
		mach_set[swp->psw_infop->p_owner] = swp->psw_infop->p_ops;
		mach_ver[swp->psw_infop->p_owner] = swp->psw_infop->p_version;
		mach_cnt[swp->psw_infop->p_owner]++;
	}
	mutex_exit(&psmsw_lock);

	mach_get_platform(PSM_OWN_SYS_DEFAULT);

	/* check to see are there any conflicts */
	if (mach_cnt[PSM_OWN_EXCLUSIVE] > 1)
		conflict_owner = PSM_OWN_EXCLUSIVE;
	if (mach_cnt[PSM_OWN_OVERRIDE] > 1)
		conflict_owner = PSM_OWN_OVERRIDE;
	if (conflict_owner) {
		/* remove all psm modules except uppc */
		cmn_err(CE_WARN,
			"Conflicts detected on the following PSM modules:");
		mutex_enter(&psmsw_lock);
		for (swp = psmsw->psw_forw; swp != psmsw; swp = swp->psw_forw) {
			if (swp->psw_infop->p_owner == conflict_owner)
				cmn_err(CE_WARN, "%s ",
					swp->psw_infop->p_mach_idstring);
		}
		mutex_exit(&psmsw_lock);
		cmn_err(CE_WARN,
			"Setting the system back to SINGLE processor mode!");
		cmn_err(CE_WARN,
		    "Please edit /etc/mach to remove the invalid PSM module.");
		return;
	}

	if (mach_set[PSM_OWN_EXCLUSIVE])
		mach_get_platform(PSM_OWN_EXCLUSIVE);

	if (mach_set[PSM_OWN_OVERRIDE])
		mach_get_platform(PSM_OWN_OVERRIDE);
}

static void
mach_init()
{
	register struct psm_ops  *pops;

	mach_construct_info();

	pops = mach_set[0];

	/* register the interrupt and clock initialization rotuines */
	picinitf = mach_picinit;
	clkinitf = mach_clkinit;
	psm_get_clockirq = pops->psm_get_clockirq;

	/* register the interrupt setup code */
	slvltovect = mach_softlvl_to_vect;
	addspl	= pops->psm_addspl;
	delspl	= pops->psm_delspl;

	if (pops->psm_translate_irq)
		psm_translate_irq = pops->psm_translate_irq;
	if (pops->psm_intr_ops)
		psm_intr_ops = pops->psm_intr_ops;
	if (pops->psm_tod_get) {
		todgetf = mach_tod_get;
		psm_todgetf = pops->psm_tod_get;
	}
	if (pops->psm_tod_set) {
		todsetf = mach_tod_set;
		psm_todsetf = pops->psm_tod_set;
	}
	if (pops->psm_notify_error) {
		psm_notify_error = mach_notify_error;
		notify_error = pops->psm_notify_error;
	}

	(*pops->psm_softinit)();

	/*
	 * Initialize the dispatcher's function hooks
	 * to enable CPU halting when idle
	 */
#if defined(_SIMULATOR_SUPPORT)
	if (halt_idle_cpus && !simulator_run)
		idle_cpu = cpu_halt;
#else
	if (halt_idle_cpus)
		idle_cpu = cpu_halt;
#endif	/* _SIMULATOR_SUPPORT */

	mach_smpinit();
}

static void
mach_smpinit(void)
{
	struct psm_ops  *pops;
	processorid_t cpu_id;
	int cnt;
	cpuset_t cpumask;

	pops = mach_set[0];

	cpu_id = -1;
	cpu_id = (*pops->psm_get_next_processorid)(cpu_id);
	for (cnt = 0, CPUSET_ZERO(cpumask); cpu_id != -1; cnt++) {
		CPUSET_ADD(cpumask, cpu_id);
		cpu_id = (*pops->psm_get_next_processorid)(cpu_id);
	}

	mp_cpus = cpumask;

	/* MP related routines */
	cpu_startf = mach_cpu_start;
	ap_mlsetup = pops->psm_post_cpu_start;
	send_dirintf = pops->psm_send_ipi;

	/* optional MP related routines */
	if (pops->psm_shutdown)
		psm_shutdownf = pops->psm_shutdown;
	if (pops->psm_preshutdown)
		psm_preshutdownf = pops->psm_preshutdown;
	if (pops->psm_notify_func)
		psm_notifyf = pops->psm_notify_func;
	if (pops->psm_set_idlecpu)
		psm_set_idle_cpuf = pops->psm_set_idlecpu;
	if (pops->psm_unset_idlecpu)
		psm_unset_idle_cpuf = pops->psm_unset_idlecpu;

	psm_clkinit = pops->psm_clkinit;

	if (pops->psm_timer_reprogram)
		psm_timer_reprogram = pops->psm_timer_reprogram;

	if (pops->psm_timer_enable)
		psm_timer_enable = pops->psm_timer_enable;

	if (pops->psm_timer_disable)
		psm_timer_disable = pops->psm_timer_disable;

	if (pops->psm_post_cyclic_setup)
		psm_post_cyclic_setup = pops->psm_post_cyclic_setup;

	/* check for multiple cpu's */
	if (cnt < 2)
		return;

	/* check for MP platforms */
	if (pops->psm_cpu_start == NULL)
		return;

	/*
	 * Set the dispatcher hook to enable cpu "wake up"
	 * when a thread becomes runnable.
	 */
#if defined(_SIMULATOR_SUPPORT)
	if (halt_idle_cpus && !simulator_run) {
		disp_enq_thread = cpu_wakeup;
	}
#else
	if (halt_idle_cpus) {
		disp_enq_thread = cpu_wakeup;
	}
#endif	/* _SIMULATOR_SUPPORT */

	if (pops->psm_disable_intr)
		psm_disable_intr = pops->psm_disable_intr;
	if (pops->psm_enable_intr)
		psm_enable_intr  = pops->psm_enable_intr;

	psm_get_ipivect = pops->psm_get_ipivect;

	(void) add_avintr((void *)NULL, XC_HI_PIL, xc_serv, "xc_hi_intr",
		(*pops->psm_get_ipivect)(XC_HI_PIL, PSM_INTR_IPI_HI),
		(caddr_t)X_CALL_HIPRI, NULL, NULL, NULL);
	(void) add_avintr((void *)NULL, XC_MED_PIL, xc_serv, "xc_med_intr",
		(*pops->psm_get_ipivect)(XC_MED_PIL, PSM_INTR_IPI_LO),
		(caddr_t)X_CALL_MEDPRI, NULL, NULL, NULL);

	(void) (*pops->psm_get_ipivect)(XC_CPUPOKE_PIL, PSM_INTR_POKE);
}

static void
mach_picinit()
{
	struct psm_ops  *pops;
	extern void install_spl(void);	/* XXX: belongs in a header file */
#if defined(__amd64) && defined(DEBUG)
	extern void *spl_patch, *slow_spl, *setsplhi_patch, *slow_setsplhi;
#endif

	pops = mach_set[0];

	/* register the interrupt handlers */
	setlvl = pops->psm_intr_enter;
	setlvlx = pops->psm_intr_exit;

	/* initialize the interrupt hardware */
	(*pops->psm_picinit)();

	/* set interrupt mask for current ipl */
	setspl = pops->psm_setspl;
	setspl(CPU->cpu_pri);

	/* Install proper spl routine now that we can Program the PIC   */
#if defined(__amd64)
	/*
	 * It would be better if we could check this at compile time
	 */
	ASSERT(((uintptr_t)&slow_setsplhi - (uintptr_t)&setsplhi_patch < 128) &&
		((uintptr_t)&slow_spl - (uintptr_t)&spl_patch < 128));
#endif
	install_spl();
}

uint_t	cpu_freq;	/* MHz */
uint64_t cpu_freq_hz;	/* measured (in hertz) */

#define	MEGA_HZ		1000000

static uint64_t
mach_calchz(uint32_t pit_counter, uint64_t *processor_clks)
{
	uint64_t cpu_hz;

	if ((pit_counter == 0) || (*processor_clks == 0) ||
	    (*processor_clks > (((uint64_t)-1) / PIT_HZ)))
		return (0);

	cpu_hz = ((uint64_t)PIT_HZ * *processor_clks) / pit_counter;

	return (cpu_hz);
}

static uint64_t
mach_getcpufreq(void)
{
	uint32_t pit_counter;
	uint64_t processor_clks;

	if (x86_feature & X86_TSC) {
		/*
		 * We have a TSC. freq_tsc() knows how to measure the number
		 * of clock cycles sampled against the PIT.
		 */
		processor_clks = freq_tsc(&pit_counter);
		return (mach_calchz(pit_counter, &processor_clks));
	} else if (x86_vendor == X86_VENDOR_Cyrix || x86_type == X86_TYPE_P5) {
#if defined(__amd64)
		panic("mach_getcpufreq: no TSC!");
#elif defined(__i386)
		/*
		 * We are a Cyrix based on a 6x86 core or an Intel Pentium
		 * for which freq_notsc() knows how to measure the number of
		 * elapsed clock cycles sampled against the PIT
		 */
		processor_clks = freq_notsc(&pit_counter);
		return (mach_calchz(pit_counter, &processor_clks));
#endif	/* __i386 */
	}

	/* We do not know how to calculate cpu frequency for this cpu. */
	return (0);
}

/*
 * If the clock speed of a cpu is found to be reported incorrectly, do not add
 * to this array, instead improve the accuracy of the algorithm that determines
 * the clock speed of the processor or extend the implementation to support the
 * vendor as appropriate. This is here only to support adjusting the speed on
 * older slower processors that mach_fixcpufreq() would not be able to account
 * for otherwise.
 */
static int x86_cpu_freq[] = { 60, 75, 80, 90, 120, 160, 166, 175, 180, 233 };

/*
 * On fast processors the clock frequency that is measured may be off by
 * a few MHz from the value printed on the part. This is a combination of
 * the factors that for such fast parts being off by this much is within
 * the tolerances for manufacture and because of the difficulties in the
 * measurement that can lead to small error. This function uses some
 * heuristics in order to tweak the value that was measured to match what
 * is most likely printed on the part.
 *
 * Some examples:
 * 	AMD Athlon 1000 mhz measured as 998 mhz
 * 	Intel Pentium III Xeon 733 mhz measured as 731 mhz
 * 	Intel Pentium IV 1500 mhz measured as 1495mhz
 *
 * If in the future this function is no longer sufficient to correct
 * for the error in the measurement, then the algorithm used to perform
 * the measurement will have to be improved in order to increase accuracy
 * rather than adding horrible and questionable kludges here.
 *
 * This is called after the cyclics subsystem because of the potential
 * that the heuristics within may give a worse estimate of the clock
 * frequency than the value that was measured.
 */
static void
mach_fixcpufreq(void)
{
	uint32_t freq, mul, near66, delta66, near50, delta50, fixed, delta, i;

	freq = (uint32_t)cpu_freq;

	/*
	 * Find the nearest integer multiple of 200/3 (about 66) MHz to the
	 * measured speed taking into account that the 667 MHz parts were
	 * the first to round-up.
	 */
	mul = (uint32_t)((3 * (uint64_t)freq + 100) / 200);
	near66 = (uint32_t)((200 * (uint64_t)mul + ((mul >= 10) ? 1 : 0)) / 3);
	delta66 = (near66 > freq) ? (near66 - freq) : (freq - near66);

	/* Find the nearest integer multiple of 50 MHz to the measured speed */
	mul = (freq + 25) / 50;
	near50 = mul * 50;
	delta50 = (near50 > freq) ? (near50 - freq) : (freq - near50);

	/* Find the closer of the two */
	if (delta66 < delta50) {
		fixed = near66;
		delta = delta66;
	} else {
		fixed = near50;
		delta = delta50;
	}

	if (fixed > INT_MAX)
		return;

	/*
	 * Some older parts have a core clock frequency that is not an
	 * integral multiple of 50 or 66 MHz. Check if one of the old
	 * clock frequencies is closer to the measured value than any
	 * of the integral multiples of 50 an 66, and if so set fixed
	 * and delta appropriately to represent the closest value.
	 */
	i = sizeof (x86_cpu_freq) / sizeof (int);
	while (i > 0) {
		i--;

		if (x86_cpu_freq[i] <= freq) {
			mul = freq - x86_cpu_freq[i];

			if (mul < delta) {
				fixed = x86_cpu_freq[i];
				delta = mul;
			}

			break;
		}

		mul = x86_cpu_freq[i] - freq;

		if (mul < delta) {
			fixed = x86_cpu_freq[i];
			delta = mul;
		}
	}

	/*
	 * Set a reasonable maximum for how much to correct the measured
	 * result by. This check is here to prevent the adjustment made
	 * by this function from being more harm than good. It is entirely
	 * possible that in the future parts will be made that are not
	 * integral multiples of 66 or 50 in clock frequency or that
	 * someone may overclock a part to some odd frequency. If the
	 * measured value is farther from the corrected value than
	 * allowed, then assume the corrected value is in error and use
	 * the measured value.
	 */
	if (6 < delta)
		return;

	cpu_freq = (int)fixed;
}


static int
machhztomhz(uint64_t cpu_freq_hz)
{
	uint64_t cpu_mhz;

	/* Round to nearest MHZ */
	cpu_mhz = (cpu_freq_hz + (MEGA_HZ / 2)) / MEGA_HZ;

	if (cpu_mhz > INT_MAX)
		return (0);

	return ((int)cpu_mhz);

}


static int
mach_clkinit(int preferred_mode, int *set_mode)
{
	register struct psm_ops  *pops;
	int resolution;

	pops = mach_set[0];

#ifdef	_SIMULATOR_SUPPORT
	if (!simulator_run)
		cpu_freq_hz = mach_getcpufreq();
	else
		cpu_freq_hz = 40000000; /* use 40 Mhz (hack for simulator) */
#else
	cpu_freq_hz = mach_getcpufreq();
#endif	/* _SIMULATOR_SUPPORT */

	cpu_freq = machhztomhz(cpu_freq_hz);

	if (!(x86_feature & X86_TSC) || (cpu_freq == 0))
		tsc_gethrtime_enable = 0;

	if (tsc_gethrtime_enable) {
		tsc_hrtimeinit(cpu_freq_hz);
		gethrtimef = tsc_gethrtime;
		gethrtimeunscaledf = tsc_gethrtimeunscaled;
		scalehrtimef = tsc_scalehrtime;
		hrtime_tick = tsc_tick;
		tsc_gethrtime_initted = 1;
	} else {
		if (pops->psm_hrtimeinit)
			(*pops->psm_hrtimeinit)();
		gethrtimef = pops->psm_gethrtime;
		gethrtimeunscaledf = gethrtimef;
		/* scalehrtimef will remain dummy */
	}

	mach_fixcpufreq();

	if (mach_ver[0] >= PSM_INFO_VER01_3) {
		if ((preferred_mode == TIMER_ONESHOT) &&
		    (tsc_gethrtime_enable)) {

			resolution = (*pops->psm_clkinit)(0);
			if (resolution != 0)  {
				*set_mode = TIMER_ONESHOT;
				return (resolution);
			}

		}

		/*
		 * either periodic mode was requested or could not set to
		 * one-shot mode
		 */
		resolution = (*pops->psm_clkinit)(hz);
		/*
		 * psm should be able to do periodic, so we do not check
		 * for return value of psm_clkinit here.
		 */
		*set_mode = TIMER_PERIODIC;
		return (resolution);
	} else {
		/*
		 * PSMI interface prior to PSMI_3 does not define a return
		 * value for psm_clkinit, so the return value is ignored.
		 */
		(void) (*pops->psm_clkinit)(hz);
		*set_mode = TIMER_PERIODIC;
		return (nsec_per_tick);
	}
}

/*ARGSUSED*/
static void
mach_psm_set_softintr(int ipl, struct av_softinfo *pending)
{
	register struct psm_ops  *pops;

	/* invoke hardware interrupt					*/
	pops = mach_set[0];
	(*pops->psm_set_softintr)(ipl);
}

static int
mach_softlvl_to_vect(register int ipl)
{
	register int softvect;
	register struct psm_ops  *pops;

	pops = mach_set[0];

	/* check for null handler for set soft interrupt call		*/
	if (pops->psm_set_softintr == NULL) {
		setsoftint = av_set_softint_pending;
		return (PSM_SV_SOFTWARE);
	}

	softvect = (*pops->psm_softlvl_to_irq)(ipl);
	/* check for hardware scheme					*/
	if (softvect > PSM_SV_SOFTWARE) {
		setsoftint = mach_psm_set_softintr;
		return (softvect);
	}

	if (softvect == PSM_SV_SOFTWARE)
		setsoftint = av_set_softint_pending;
	else	/* hardware and software mixed scheme			*/
		setsoftint = mach_set_softintr;

	return (PSM_SV_SOFTWARE);
}

static void
mach_set_softintr(register int ipl, struct av_softinfo *pending)
{
	register struct psm_ops  *pops;

	/* set software pending bits					*/
	av_set_softint_pending(ipl, pending);

	/*	check if dosoftint will be called at the end of intr	*/
	if (CPU_ON_INTR(CPU) || (curthread->t_intr))
		return;

	/* invoke hardware interrupt					*/
	pops = mach_set[0];
	(*pops->psm_set_softintr)(ipl);
}

static void
mach_cpu_start(register int cpun)
{
	register struct psm_ops  *pops;
	int	i;

	pops = mach_set[0];

	(*pops->psm_cpu_start)(cpun, rm_platter_va);

	/* wait for the auxillary cpu to be ready			*/
	for (i = 20000; i; i--) {
		if (cpu[cpun]->cpu_flags & CPU_READY)
			return;
		drv_usecwait(100);
	}
}

/*ARGSUSED*/
static int
mach_translate_irq(dev_info_t *dip, int irqno)
{
	return (irqno);	/* default to NO translation */
}

static timestruc_t
mach_tod_get(void)
{
	timestruc_t ts;
	todinfo_t tod;
	static int mach_range_warn = 1;	/* warn only once */

	ASSERT(MUTEX_HELD(&tod_lock));

	/* The year returned from is the last 2 digit only */
	if ((*psm_todgetf)(&tod)) {
		ts.tv_sec = 0;
		ts.tv_nsec = 0;
		tod_fault_reset();
		return (ts);
	}

	/* assume that we wrap the rtc year back to zero at 2000 */
	if (tod.tod_year < 69) {
		if (mach_range_warn && tod.tod_year > 38) {
			cmn_err(CE_WARN, "hardware real-time clock is out "
				"of range -- time needs to be reset");
			mach_range_warn = 0;
		}
		tod.tod_year += 100;
	}

	/* tod_to_utc uses 1900 as base for the year */
	ts.tv_sec = tod_to_utc(tod) + gmt_lag;
	ts.tv_nsec = 0;

	return (ts);
}

static void
mach_tod_set(timestruc_t ts)
{
	todinfo_t tod = utc_to_tod(ts.tv_sec - gmt_lag);

	ASSERT(MUTEX_HELD(&tod_lock));

	if (tod.tod_year >= 100)
		tod.tod_year -= 100;

	(*psm_todsetf)(&tod);
}

static void
mach_notify_error(int level, char *errmsg)
{
	/*
	 * SL_FATAL is pass in once panicstr is set, deliver it
	 * as CE_PANIC.  Also, translate SL_ codes back to CE_
	 * codes for the psmi handler
	 */
	if (level & SL_FATAL)
		(*notify_error)(CE_PANIC, errmsg);
	else if (level & SL_WARN)
		(*notify_error)(CE_WARN, errmsg);
	else if (level & SL_NOTE)
		(*notify_error)(CE_NOTE, errmsg);
	else if (level & SL_CONSOLE)
		(*notify_error)(CE_CONT, errmsg);
}

/*
 * It provides the default basic intr_ops interface for the new DDI
 * interrupt framework if the PSM doesn't have one.
 *
 * Input:
 * dip     - pointer to the dev_info structure of the requested device
 * hdlp    - pointer to the internal interrupt handle structure for the
 *	     requested interrupt
 * intr_op - opcode for this call
 * result  - pointer to the integer that will hold the result to be
 *	     passed back if return value is PSM_SUCCESS
 *
 * Output:
 * return value is either PSM_SUCCESS or PSM_FAILURE
 */
static int
mach_intr_ops(dev_info_t *dip, ddi_intr_handle_impl_t *hdlp,
    psm_intr_op_t intr_op, int *result)
{
	struct intrspec *ispec;

	switch (intr_op) {
	case PSM_INTR_OP_CHECK_MSI:
		*result = hdlp->ih_type & ~(DDI_INTR_TYPE_MSI |
			    DDI_INTR_TYPE_MSIX);
		break;
	case PSM_INTR_OP_ALLOC_VECTORS:
		if (hdlp->ih_type == DDI_INTR_TYPE_FIXED)
			*result = 1;
		else
			*result = 0;
		break;
	case PSM_INTR_OP_FREE_VECTORS:
		break;
	case PSM_INTR_OP_NAVAIL_VECTORS:
		if (hdlp->ih_type == DDI_INTR_TYPE_FIXED)
			*result = 1;
		else
			*result = 0;
		break;
	case PSM_INTR_OP_XLATE_VECTOR:
		ispec = ((ihdl_plat_t *)hdlp->ih_private)->ip_ispecp;
		*result = psm_translate_irq(dip, ispec->intrspec_vec);
		break;
	case PSM_INTR_OP_GET_CAP:
		*result = 0;
		break;
	case PSM_INTR_OP_GET_PENDING:
	case PSM_INTR_OP_CLEAR_MASK:
	case PSM_INTR_OP_SET_MASK:
	case PSM_INTR_OP_GET_SHARED:
	case PSM_INTR_OP_SET_PRI:
	case PSM_INTR_OP_SET_CAP:
	case PSM_INTR_OP_SET_CPU:
	case PSM_INTR_OP_GET_INTR:
	default:
		return (PSM_FAILURE);
	}
	return (PSM_SUCCESS);
}