FreeBSD/Linux Kernel Cross Reference
sys/sparc64/sparc64/machdep.c

     /*-
      * 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
     * $FreeBSD: releng/5.3/sys/sparc64/sparc64/machdep.c 136241 2004-10-07 22:18:35Z kensmith $
     */
    
    #include "opt_compat.h"
    #include "opt_ddb.h"
    #include "opt_kstack_pages.h"
    #include "opt_msgbuf.h"
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/cons.h>
    #include <sys/imgact.h>
    #include <sys/kdb.h>
    #include <sys/kernel.h>
    #include <sys/ktr.h>
    #include <sys/linker.h>
    #include <sys/lock.h>
    #include <sys/malloc.h>
    #include <sys/msgbuf.h>
    #include <sys/mutex.h>
    #include <sys/pcpu.h>
    #include <sys/proc.h>
    #include <sys/reboot.h>
    #include <sys/bio.h>
    #include <sys/buf.h>
    #include <sys/bus.h>
    #include <sys/eventhandler.h>
    #include <sys/interrupt.h>
    #include <sys/ptrace.h>
    #include <sys/signalvar.h>
    #include <sys/smp.h>
    #include <sys/sysent.h>
    #include <sys/sysproto.h>
    #include <sys/timetc.h>
    #include <sys/user.h>
    #include <sys/ucontext.h>
    #include <sys/user.h>
    #include <sys/ucontext.h>
    #include <sys/exec.h>
    
    #include <dev/ofw/openfirm.h>
    
    #include <vm/vm.h>
    #include <vm/vm_param.h>
    #include <vm/vm_kern.h>
    #include <vm/vm_object.h>
    #include <vm/vm_page.h>
    #include <vm/vm_map.h>
    #include <vm/vm_pager.h>
    #include <vm/vm_extern.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/smp.h>
   #include <machine/pmap.h>
   #include <machine/pstate.h>
   #include <machine/reg.h>
   #include <machine/sigframe.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;
   
   char pcpu0[PCPU_PAGES * PAGE_SIZE];
   char uarea0[UAREA_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));
   
           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;
           }
   }
   
   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);
           }
   
           /*
            * Disable tick for now.
            */
           tick_stop();
   
           /*
            * 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;
           proc0.p_uarea = (struct user *)uarea0;
           proc0.p_stats = &proc0.p_uarea->u_stats;
           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, int sig, sigset_t *mask, u_long code)
   {
           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;
   
           oonstack = 0;
           td = curthread;
           p = td->td_proc;
           PROC_LOCK_ASSERT(p, MA_OWNED);
           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.si_signo = sig;
           sf.sf_si.si_code = code;
           sf.sf_si.si_addr = (void *)tf->tf_sfar;
   
           /* 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);
   }
   
   /*
    * Build siginfo_t for SA thread
    */
   void
   cpu_thread_siginfo(int sig, u_long code, siginfo_t *si)
   {
           struct proc *p;
           struct thread *td;
   
           td = curthread;
           p = td->td_proc;
           PROC_LOCK_ASSERT(p, MA_OWNED);
   
           bzero(si, sizeof(*si));
           si->si_signo = sig;
           si->si_code = code;
           /* XXXKSE fill other fields */
   }
   
   #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;
           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);
   }
   
   /*
    * 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 md_utrap *ut;
           struct pcb *pcb;
           struct proc *p;
           u_long sp;
   
           /* XXX no cpu_exec */
           p = td->td_proc;
           p->p_md.md_sigtramp = NULL;
           if ((ut = p->p_md.md_utrap) != NULL) {
                   ut->ut_refcnt--;
                   if (ut->ut_refcnt == 0)
                           free(ut, M_SUBPROC);
                   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);
   }

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