text: /*-
   * Copyright (c) 2001 Jake Burkholder.
   * Copyright (c) 1992 Terrence R. Lambert.
   * Copyright (c) 1982, 1987, 1990 The Regents of the University of California.
   * All rights reserved.
   *
   * This code is derived from software contributed to Berkeley by
   * William Jolitz.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 4. Neither the name of the University nor the names of its contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   *
   *	from: @(#)machdep.c	7.4 (Berkeley) 6/3/91
   * 	from: FreeBSD: src/sys/i386/i386/machdep.c,v 1.477 2001/08/27
   */
  
  #include <sys/cdefs.h>
  __FBSDID("$FreeBSD: src/sys/sparc64/sparc64/machdep.c,v 1.127 2006/02/14 14:50:11 jhb Exp $");
  
  #include "opt_compat.h"
  #include "opt_ddb.h"
  #include "opt_kstack_pages.h"
  #include "opt_msgbuf.h"
  
  #include <sys/param.h>
  #include <sys/malloc.h>
  #include <sys/proc.h>
  #include <sys/systm.h>
  #include <sys/bio.h>
  #include <sys/buf.h>
  #include <sys/bus.h>
  #include <sys/cpu.h>
  #include <sys/cons.h>
  #include <sys/eventhandler.h>
  #include <sys/exec.h>
  #include <sys/imgact.h>
  #include <sys/interrupt.h>
  #include <sys/kdb.h>
  #include <sys/kernel.h>
  #include <sys/ktr.h>
  #include <sys/linker.h>
  #include <sys/lock.h>
  #include <sys/msgbuf.h>
  #include <sys/mutex.h>
  #include <sys/pcpu.h>
  #include <sys/ptrace.h>
  #include <sys/reboot.h>
  #include <sys/signalvar.h>
  #include <sys/smp.h>
  #include <sys/sysent.h>
  #include <sys/sysproto.h>
  #include <sys/timetc.h>
  #include <sys/ucontext.h>
  
  #include <dev/ofw/openfirm.h>
  
  #include <vm/vm.h>
  #include <vm/vm_extern.h>
  #include <vm/vm_kern.h>
  #include <vm/vm_page.h>
  #include <vm/vm_map.h>
  #include <vm/vm_object.h>
  #include <vm/vm_pager.h>
  #include <vm/vm_param.h>
  
  #include <ddb/ddb.h>
  
  #include <machine/bus.h>
  #include <machine/cache.h>
  #include <machine/clock.h>
  #include <machine/cpu.h>
  #include <machine/fp.h>
  #include <machine/fsr.h>
  #include <machine/intr_machdep.h>
  #include <machine/md_var.h>
  #include <machine/metadata.h>
  #include <machine/ofw_machdep.h>
  #include <machine/ofw_mem.h>
  #include <machine/pcb.h>
  #include <machine/pmap.h>
  #include <machine/pstate.h>
  #include <machine/reg.h>
  #include <machine/sigframe.h>
  #include <machine/smp.h>
  #include <machine/tick.h>
  #include <machine/tlb.h>
  #include <machine/tstate.h>
  #include <machine/upa.h>
  #include <machine/ver.h>
  
  typedef int ofw_vec_t(void *);
  
  #ifdef DDB
  extern vm_offset_t ksym_start, ksym_end;
  #endif
  
  struct tlb_entry *kernel_tlbs;
  int kernel_tlb_slots;
  
  int cold = 1;
  long Maxmem;
  long realmem;
  
  char pcpu0[PCPU_PAGES * PAGE_SIZE];
  struct trapframe frame0;
  
  vm_offset_t kstack0;
  vm_paddr_t kstack0_phys;
  
  struct kva_md_info kmi;
  
  u_long ofw_vec;
  u_long ofw_tba;
  
  /*
   * Note: timer quality for CPU's is set low to try and prevent them from
   * being chosen as the primary timecounter.  The CPU counters are not
   * synchronized among the CPU's so in MP machines this causes problems
   * when calculating the time.  With this value the CPU's should only be
   * chosen as the primary timecounter as a last resort.
   */
  
  #define	UP_TICK_QUALITY	1000
  #define	MP_TICK_QUALITY	-100
  static struct timecounter tick_tc;
  
  char sparc64_model[32];
  
  static int cpu_use_vis = 1;
  
  cpu_block_copy_t *cpu_block_copy;
  cpu_block_zero_t *cpu_block_zero;
  
  static timecounter_get_t tick_get_timecount;
  void sparc64_init(caddr_t mdp, u_long o1, u_long o2, u_long o3,
  		  ofw_vec_t *vec);
  void sparc64_shutdown_final(void *dummy, int howto);
  
  static void cpu_startup(void *);
  SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL);
  
  CTASSERT((1 << INT_SHIFT) == sizeof(int));
  CTASSERT((1 << PTR_SHIFT) == sizeof(char *));
  
  CTASSERT(sizeof(struct reg) == 256);
  CTASSERT(sizeof(struct fpreg) == 272);
  CTASSERT(sizeof(struct __mcontext) == 512);
  
  CTASSERT((sizeof(struct pcb) & (64 - 1)) == 0);
  CTASSERT((offsetof(struct pcb, pcb_kfp) & (64 - 1)) == 0);
  CTASSERT((offsetof(struct pcb, pcb_ufp) & (64 - 1)) == 0);
  CTASSERT(sizeof(struct pcb) <= ((KSTACK_PAGES * PAGE_SIZE) / 8));
  
  CTASSERT(sizeof(struct pcpu) <= ((PCPU_PAGES * PAGE_SIZE) / 2));
  
  static void
  cpu_startup(void *arg)
  {
  	vm_paddr_t physsz;
  	int i;
  
  	tick_tc.tc_get_timecount = tick_get_timecount;
  	tick_tc.tc_poll_pps = NULL;
  	tick_tc.tc_counter_mask = ~0u;
  	tick_tc.tc_frequency = tick_freq;
  	tick_tc.tc_name = "tick";
  	tick_tc.tc_quality = UP_TICK_QUALITY;
  #ifdef SMP
  	/*
  	 * We do not know if each CPU's tick counter is synchronized.
  	 */
  	if (cpu_mp_probe())
  		tick_tc.tc_quality = MP_TICK_QUALITY;
  #endif
  
  	tc_init(&tick_tc);
  
  	physsz = 0;
  	for (i = 0; i < sparc64_nmemreg; i++)
  		physsz += sparc64_memreg[i].mr_size;
  	printf("real memory  = %lu (%lu MB)\n", physsz,
  	    physsz / (1024 * 1024));
  	realmem = (long)physsz / PAGE_SIZE;
  
  	vm_ksubmap_init(&kmi);
  
  	bufinit();
  	vm_pager_bufferinit();
  
  	EVENTHANDLER_REGISTER(shutdown_final, sparc64_shutdown_final, NULL,
  	    SHUTDOWN_PRI_LAST);
  
  	printf("avail memory = %lu (%lu MB)\n", cnt.v_free_count * PAGE_SIZE,
  	    cnt.v_free_count / ((1024 * 1024) / PAGE_SIZE));
  
  	if (bootverbose)
  		printf("machine: %s\n", sparc64_model);
  
  	cpu_identify(rdpr(ver), tick_freq, PCPU_GET(cpuid));
  }
  
  void
  cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t size)
  {
  	struct intr_request *ir;
  	int i;
  
  	pcpu->pc_irtail = &pcpu->pc_irhead;
  	for (i = 0; i < IR_FREE; i++) {
  		ir = &pcpu->pc_irpool[i];
  		ir->ir_next = pcpu->pc_irfree;
  		pcpu->pc_irfree = ir;
  	}
  }
  
  void
  spinlock_enter(void)
  {
  	struct thread *td;
  	register_t pil;
  
  	td = curthread;
  	if (td->td_md.md_spinlock_count == 0) {
  		pil = rdpr(pil);
  		wrpr(pil, 0, PIL_TICK);
  		td->td_md.md_saved_pil = pil;
  	}
  	td->td_md.md_spinlock_count++;
  	critical_enter();
  }
  
  void
  spinlock_exit(void)
  {
  	struct thread *td;
  
  	td = curthread;
  	critical_exit();
  	td->td_md.md_spinlock_count--;
  	if (td->td_md.md_spinlock_count == 0)
  		wrpr(pil, td->td_md.md_saved_pil, 0);
  }
  
  unsigned
  tick_get_timecount(struct timecounter *tc)
  {
  	return ((unsigned)rd(tick));
  }
  
  void
  sparc64_init(caddr_t mdp, u_long o1, u_long o2, u_long o3, ofw_vec_t *vec)
  {
  	phandle_t child;
  	phandle_t root;
  	struct pcpu *pc;
  	vm_offset_t end;
  	caddr_t kmdp;
  	u_int clock;
  	char *env;
  	char type[8];
  
  	end = 0;
  	kmdp = NULL;
  
  	/*
  	 * Find out what kind of cpu we have first, for anything that changes
  	 * behaviour.
  	 */
  	cpu_impl = VER_IMPL(rdpr(ver));
  
  	/*
  	 * Initialize Open Firmware (needed for console).
  	 */
  	OF_init(vec);
  
  	/*
  	 * Parse metadata if present and fetch parameters.  Must be before the
  	 * console is inited so cninit gets the right value of boothowto.
  	 */
  	if (mdp != NULL) {
  		preload_metadata = mdp;
  		kmdp = preload_search_by_type("elf kernel");
  		if (kmdp != NULL) {
  			boothowto = MD_FETCH(kmdp, MODINFOMD_HOWTO, int);
  			kern_envp = MD_FETCH(kmdp, MODINFOMD_ENVP, char *);
  			end = MD_FETCH(kmdp, MODINFOMD_KERNEND, vm_offset_t);
  			kernel_tlb_slots = MD_FETCH(kmdp, MODINFOMD_DTLB_SLOTS,
  			    int);
  			kernel_tlbs = (void *)preload_search_info(kmdp,
  			    MODINFO_METADATA | MODINFOMD_DTLB);
  		}
  	}
  
  	init_param1();
  
  	root = OF_peer(0);
  	for (child = OF_child(root); child != 0; child = OF_peer(child)) {
  		OF_getprop(child, "device_type", type, sizeof(type));
  		if (strcmp(type, "cpu") == 0)
  			break;
  	}
  
  	OF_getprop(child, "clock-frequency", &clock, sizeof(clock));
  	tick_init(clock);
  
  	/*
  	 * Initialize the console before printing anything.
  	 */
  	cninit();
  
  	/*
  	 * Panic is there is no metadata.  Most likely the kernel was booted
  	 * directly, instead of through loader(8).
  	 */
  	if (mdp == NULL || kmdp == NULL) {
  		printf("sparc64_init: no loader metadata.\n"
  		       "This probably means you are not using loader(8).\n");
  		panic("sparc64_init");
  	}
  
  	/*
  	 * Sanity check the kernel end, which is important.
  	 */
  	if (end == 0) {
  		printf("sparc64_init: warning, kernel end not specified.\n"
  		       "Attempting to continue anyway.\n");
  		end = (vm_offset_t)_end;
  	}
  
  	cache_init(child);
  
  	getenv_int("machdep.use_vis", &cpu_use_vis);
  	if (cpu_use_vis) {
  		cpu_block_copy = spitfire_block_copy;
  		cpu_block_zero = spitfire_block_zero;
  	} else {
  		cpu_block_copy = bcopy;
  		cpu_block_zero = bzero;
  	}
  
  #ifdef SMP
  	mp_tramp = mp_tramp_alloc();
  #endif
  
  	/*
  	 * Initialize virtual memory and calculate physmem.
  	 */
  	pmap_bootstrap(end);
  
  	/*
  	 * Initialize tunables.
  	 */
  	init_param2(physmem);
  	env = getenv("kernelname");
  	if (env != NULL) {
  		strlcpy(kernelname, env, sizeof(kernelname));
  		freeenv(env);
  	}
  
  	/*
  	 * Initialize the interrupt tables.
  	 */
  	intr_init1();
  
  	/*
  	 * Initialize proc0 stuff (p_contested needs to be done early).
  	 */
  	proc_linkup(&proc0, &ksegrp0, &thread0);
  	proc0.p_md.md_sigtramp = NULL;
  	proc0.p_md.md_utrap = NULL;
  	thread0.td_kstack = kstack0;
  	thread0.td_pcb = (struct pcb *)
  	    (thread0.td_kstack + KSTACK_PAGES * PAGE_SIZE) - 1;
  	frame0.tf_tstate = TSTATE_IE | TSTATE_PEF | TSTATE_PRIV;
  	thread0.td_frame = &frame0;
  
  	/*
  	 * Prime our per-cpu data page for use.  Note, we are using it for our
  	 * stack, so don't pass the real size (PAGE_SIZE) to pcpu_init or
  	 * it'll zero it out from under us.
  	 */
  	pc = (struct pcpu *)(pcpu0 + (PCPU_PAGES * PAGE_SIZE)) - 1;
  	pcpu_init(pc, 0, sizeof(struct pcpu));
  	pc->pc_curthread = &thread0;
  	pc->pc_curpcb = thread0.td_pcb;
  	pc->pc_mid = UPA_CR_GET_MID(ldxa(0, ASI_UPA_CONFIG_REG));
  	pc->pc_addr = (vm_offset_t)pcpu0;
  	pc->pc_node = child;
  	pc->pc_tlb_ctx = TLB_CTX_USER_MIN;
  	pc->pc_tlb_ctx_min = TLB_CTX_USER_MIN;
  	pc->pc_tlb_ctx_max = TLB_CTX_USER_MAX;
  
  	/*
  	 * Initialize global registers.
  	 */
  	cpu_setregs(pc);
  
  	/*
  	 * Initialize the message buffer (after setting trap table).
  	 */
  	msgbufinit(msgbufp, MSGBUF_SIZE);
  
  	mutex_init();
  	intr_init2();
  
  	/*
  	 * Finish pmap initialization now that we're ready for mutexes.
  	 */
  	PMAP_LOCK_INIT(kernel_pmap);
  
  	OF_getprop(root, "name", sparc64_model, sizeof(sparc64_model) - 1);
  
  	kdb_init();
  
  #ifdef KDB
  	if (boothowto & RB_KDB)
  		kdb_enter("Boot flags requested debugger");
  #endif
  }
  
  void
  set_openfirm_callback(ofw_vec_t *vec)
  {
  	ofw_tba = rdpr(tba);
  	ofw_vec = (u_long)vec;
  }
  
  void
  sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
  {
  	struct trapframe *tf;
  	struct sigframe *sfp;
  	struct sigacts *psp;
  	struct sigframe sf;
  	struct thread *td;
  	struct frame *fp;
  	struct proc *p;
  	int oonstack;
  	u_long sp;
  	int sig;
  	int code;
  
  	oonstack = 0;
  	td = curthread;
  	p = td->td_proc;
  	PROC_LOCK_ASSERT(p, MA_OWNED);
  	sig = ksi->ksi_signo;
  	code = ksi->ksi_code;
  	psp = p->p_sigacts;
  	mtx_assert(&psp->ps_mtx, MA_OWNED);
  	tf = td->td_frame;
  	sp = tf->tf_sp + SPOFF;
  	oonstack = sigonstack(sp);
  
  	CTR4(KTR_SIG, "sendsig: td=%p (%s) catcher=%p sig=%d", td, p->p_comm,
  	    catcher, sig);
  
  	/* Make sure we have a signal trampoline to return to. */
  	if (p->p_md.md_sigtramp == NULL) {
  		/*
  		 * No signal tramoline... kill the process.
  		 */
  		CTR0(KTR_SIG, "sendsig: no sigtramp");
  		printf("sendsig: %s is too old, rebuild it\n", p->p_comm);
  		sigexit(td, sig);
  		/* NOTREACHED */
  	}
  
  	/* Save user context. */
  	bzero(&sf, sizeof(sf));
  	get_mcontext(td, &sf.sf_uc.uc_mcontext, 0);
  	sf.sf_uc.uc_sigmask = *mask;
  	sf.sf_uc.uc_stack = td->td_sigstk;
  	sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
  	    ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
  
  	/* Allocate and validate space for the signal handler context. */
  	if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
  	    SIGISMEMBER(psp->ps_sigonstack, sig)) {
  		sfp = (struct sigframe *)(td->td_sigstk.ss_sp +
  		    td->td_sigstk.ss_size - sizeof(struct sigframe));
  	} else
  		sfp = (struct sigframe *)sp - 1;
  	mtx_unlock(&psp->ps_mtx);
  	PROC_UNLOCK(p);
  
  	fp = (struct frame *)sfp - 1;
  
  	/* Translate the signal if appropriate. */
  	if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize)
  		sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
  
  	/* Build the argument list for the signal handler. */
  	tf->tf_out[0] = sig;
  	tf->tf_out[1] = (register_t)&sfp->sf_si;
  	tf->tf_out[2] = (register_t)&sfp->sf_uc;
  	tf->tf_out[4] = (register_t)catcher;
  	/* Fill siginfo structure. */
  	sf.sf_si = ksi->ksi_info;
  	sf.sf_si.si_addr = (void *)tf->tf_sfar; /* XXX */
  
  	/* Copy the sigframe out to the user's stack. */
  	if (rwindow_save(td) != 0 || copyout(&sf, sfp, sizeof(*sfp)) != 0 ||
  	    suword(&fp->fr_in[6], tf->tf_out[6]) != 0) {
  		/*
  		 * Something is wrong with the stack pointer.
  		 * ...Kill the process.
  		 */
  		CTR2(KTR_SIG, "sendsig: sigexit td=%p sfp=%p", td, sfp);
  		PROC_LOCK(p);
  		sigexit(td, SIGILL);
  		/* NOTREACHED */
  	}
  
  	tf->tf_tpc = (u_long)p->p_md.md_sigtramp;
  	tf->tf_tnpc = tf->tf_tpc + 4;
  	tf->tf_sp = (u_long)fp - SPOFF;
  
  	CTR3(KTR_SIG, "sendsig: return td=%p pc=%#lx sp=%#lx", td, tf->tf_tpc,
  	    tf->tf_sp);
  
  	PROC_LOCK(p);
  	mtx_lock(&psp->ps_mtx);
  }
  
  #ifndef	_SYS_SYSPROTO_H_
  struct sigreturn_args {
  	ucontext_t *ucp;
  };
  #endif
  
  /*
   * MPSAFE
   */
  int
  sigreturn(struct thread *td, struct sigreturn_args *uap)
  {
  	struct proc *p;
  	mcontext_t *mc;
  	ucontext_t uc;
  	int error;
  
  	p = td->td_proc;
  	if (rwindow_save(td)) {
  		PROC_LOCK(p);
  		sigexit(td, SIGILL);
  	}
  
  	CTR2(KTR_SIG, "sigreturn: td=%p ucp=%p", td, uap->sigcntxp);
  	if (copyin(uap->sigcntxp, &uc, sizeof(uc)) != 0) {
  		CTR1(KTR_SIG, "sigreturn: efault td=%p", td);
  		return (EFAULT);
  	}
  
  	mc = &uc.uc_mcontext;
  	error = set_mcontext(td, mc);
  	if (error != 0)
  		return (error);
  
  	PROC_LOCK(p);
  	td->td_sigmask = uc.uc_sigmask;
  	SIG_CANTMASK(td->td_sigmask);
  	signotify(td);
  	PROC_UNLOCK(p);
  
  	CTR4(KTR_SIG, "sigreturn: return td=%p pc=%#lx sp=%#lx tstate=%#lx",
  	    td, mc->mc_tpc, mc->mc_sp, mc->mc_tstate);
  	return (EJUSTRETURN);
  }
  
  #ifdef COMPAT_FREEBSD4
  int
  freebsd4_sigreturn(struct thread *td, struct freebsd4_sigreturn_args *uap)
  {
  
  	return sigreturn(td, (struct sigreturn_args *)uap);
  }
  #endif
  
  /*
   * Construct a PCB from a trapframe. This is called from kdb_trap() where
   * we want to start a backtrace from the function that caused us to enter
   * the debugger. We have the context in the trapframe, but base the trace
   * on the PCB. The PCB doesn't have to be perfect, as long as it contains
   * enough for a backtrace.
   */
  void
  makectx(struct trapframe *tf, struct pcb *pcb)
  {
  
  	pcb->pcb_pc = tf->tf_tpc;
  	pcb->pcb_sp = tf->tf_sp;
  }
  
  int
  get_mcontext(struct thread *td, mcontext_t *mc, int flags)
  {
  	struct trapframe *tf;
  	struct pcb *pcb;
  
  	tf = td->td_frame;
  	pcb = td->td_pcb;
  	bcopy(tf, mc, sizeof(*tf));
  	if (flags & GET_MC_CLEAR_RET) {
  		mc->mc_out[0] = 0;
  		mc->mc_out[1] = 0;
  	}
  	mc->mc_flags = _MC_VERSION;
  	critical_enter();
  	if ((tf->tf_fprs & FPRS_FEF) != 0) {
  		savefpctx(pcb->pcb_ufp);
  		tf->tf_fprs &= ~FPRS_FEF;
  		pcb->pcb_flags |= PCB_FEF;
  	}
  	if ((pcb->pcb_flags & PCB_FEF) != 0) {
  		bcopy(pcb->pcb_ufp, mc->mc_fp, sizeof(mc->mc_fp));
  		mc->mc_fprs |= FPRS_FEF;
  	}
  	critical_exit();
  	return (0);
  }
  
  int
  set_mcontext(struct thread *td, const mcontext_t *mc)
  {
  	struct trapframe *tf;
  	struct pcb *pcb;
  	uint64_t wstate;
  
  	if (!TSTATE_SECURE(mc->mc_tstate) ||
  	    (mc->mc_flags & ((1L << _MC_VERSION_BITS) - 1)) != _MC_VERSION)
  		return (EINVAL);
  	tf = td->td_frame;
  	pcb = td->td_pcb;
  	/* Make sure the windows are spilled first. */
  	flushw();
  	wstate = tf->tf_wstate;
  	bcopy(mc, tf, sizeof(*tf));
  	tf->tf_wstate = wstate;
  	if ((mc->mc_fprs & FPRS_FEF) != 0) {
  		tf->tf_fprs = 0;
  		bcopy(mc->mc_fp, pcb->pcb_ufp, sizeof(pcb->pcb_ufp));
  		pcb->pcb_flags |= PCB_FEF;
  	}
  	return (0);
  }
  
  /*
   * Exit the kernel and execute a firmware call that will not return, as
   * specified by the arguments.
   */
  void
  cpu_shutdown(void *args)
  {
  
  #ifdef SMP
  	cpu_mp_shutdown();
  #endif
  	openfirmware_exit(args);
  }
  
  /* Get current clock frequency for the given cpu id. */
  int
  cpu_est_clockrate(int cpu_id, uint64_t *rate)
  {
  
  	return (ENXIO);
  }
  
  /*
   * Duplicate OF_exit() with a different firmware call function that restores
   * the trap table, otherwise a RED state exception is triggered in at least
   * some firmware versions.
   */
  void
  cpu_halt(void)
  {
  	static struct {
  		cell_t name;
  		cell_t nargs;
  		cell_t nreturns;
  	} args = {
  		(cell_t)"exit",
  		0,
  		0
  	};
  
  	cpu_shutdown(&args);
  }
  
  void
  sparc64_shutdown_final(void *dummy, int howto)
  {
  	static struct {
  		cell_t name;
  		cell_t nargs;
  		cell_t nreturns;
  	} args = {
  		(cell_t)"SUNW,power-off",
  		0,
  		0
  	};
  
  	/* Turn the power off? */
  	if ((howto & RB_POWEROFF) != 0)
  		cpu_shutdown(&args);
  	/* In case of halt, return to the firmware */
  	if ((howto & RB_HALT) != 0)
  		cpu_halt();
  }
  
  void
  cpu_idle(void)
  {
  	/* Insert code to halt (until next interrupt) for the idle loop */
  }
  
  int
  ptrace_set_pc(struct thread *td, u_long addr)
  {
  
  	td->td_frame->tf_tpc = addr;
  	td->td_frame->tf_tnpc = addr + 4;
  	return (0);
  }
  
  int
  ptrace_single_step(struct thread *td)
  {
  	/* TODO; */
  	return (0);
  }
  
  int
  ptrace_clear_single_step(struct thread *td)
  {
  	/* TODO; */
  	return (0);
  }
  
  void
  exec_setregs(struct thread *td, u_long entry, u_long stack, u_long ps_strings)
  {
  	struct trapframe *tf;
  	struct pcb *pcb;
  	struct proc *p;
  	u_long sp;
  
  	/* XXX no cpu_exec */
  	p = td->td_proc;
  	p->p_md.md_sigtramp = NULL;
  	if (p->p_md.md_utrap != NULL) {
  		utrap_free(p->p_md.md_utrap);
  		p->p_md.md_utrap = NULL;
  	}
  
  	pcb = td->td_pcb;
  	tf = td->td_frame;
  	sp = rounddown(stack, 16);
  	bzero(pcb, sizeof(*pcb));
  	bzero(tf, sizeof(*tf));
  	tf->tf_out[0] = stack;
  	tf->tf_out[3] = p->p_sysent->sv_psstrings;
  	tf->tf_out[6] = sp - SPOFF - sizeof(struct frame);
  	tf->tf_tnpc = entry + 4;
  	tf->tf_tpc = entry;
  	tf->tf_tstate = TSTATE_IE | TSTATE_PEF | TSTATE_MM_TSO;
  
  	td->td_retval[0] = tf->tf_out[0];
  	td->td_retval[1] = tf->tf_out[1];
  }
  
  int
  fill_regs(struct thread *td, struct reg *regs)
  {
  
  	bcopy(td->td_frame, regs, sizeof(*regs));
  	return (0);
  }
  
  int
  set_regs(struct thread *td, struct reg *regs)
  {
  	struct trapframe *tf;
  
  	if (!TSTATE_SECURE(regs->r_tstate))
  		return (EINVAL);
  	tf = td->td_frame;
  	regs->r_wstate = tf->tf_wstate;
  	bcopy(regs, tf, sizeof(*regs));
  	return (0);
  }
  
  int
  fill_dbregs(struct thread *td, struct dbreg *dbregs)
  {
  
  	return (ENOSYS);
  }
  
  int
  set_dbregs(struct thread *td, struct dbreg *dbregs)
  {
  
  	return (ENOSYS);
  }
  
  int
  fill_fpregs(struct thread *td, struct fpreg *fpregs)
  {
  	struct trapframe *tf;
  	struct pcb *pcb;
  
  	pcb = td->td_pcb;
  	tf = td->td_frame;
  	bcopy(pcb->pcb_ufp, fpregs->fr_regs, sizeof(fpregs->fr_regs));
  	fpregs->fr_fsr = tf->tf_fsr;
  	fpregs->fr_gsr = tf->tf_gsr;
  	return (0);
  }
  
  int
  set_fpregs(struct thread *td, struct fpreg *fpregs)
  {
  	struct trapframe *tf;
  	struct pcb *pcb;
  
  	pcb = td->td_pcb;
  	tf = td->td_frame;
  	tf->tf_fprs &= ~FPRS_FEF;
  	bcopy(fpregs->fr_regs, pcb->pcb_ufp, sizeof(pcb->pcb_ufp));
  	tf->tf_fsr = fpregs->fr_fsr;
  	tf->tf_gsr = fpregs->fr_gsr;
  	return (0);
  }
  
  struct md_utrap *
  utrap_alloc(void)
  {
  	struct md_utrap *ut;
  
  	ut = malloc(sizeof(struct md_utrap), M_SUBPROC, M_WAITOK | M_ZERO);
  	ut->ut_refcnt = 1;
  	return (ut);
  }
  
  void
  utrap_free(struct md_utrap *ut)
  {
  	int refcnt;
  
  	if (ut == NULL)
  		return;
  	mtx_pool_lock(mtxpool_sleep, ut);
  	ut->ut_refcnt--;
  	refcnt = ut->ut_refcnt;
  	mtx_pool_unlock(mtxpool_sleep, ut);
  	if (refcnt == 0)
  		free(ut, M_SUBPROC);
  }
  
  struct md_utrap *
  utrap_hold(struct md_utrap *ut)
  {
  
  	if (ut == NULL)
  		return (NULL);
  	mtx_pool_lock(mtxpool_sleep, ut);
  	ut->ut_refcnt++;
  	mtx_pool_unlock(mtxpool_sleep, ut);
  	return (ut);
  }
  