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

     /*
      * Copyright (C) 1995, 1996 Wolfgang Solfrank.
      * Copyright (C) 1995, 1996 TooLs GmbH.
      * All rights reserved.
      *
      * 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.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by TooLs GmbH.
     * 4. The name of TooLs GmbH may not be used to endorse or promote products
     *    derived from this software without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``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 TOOLS GMBH 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.
     */
    /*
     * Copyright (C) 2001 Benno Rice
     * All rights reserved.
     *
     * 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.
     *
     * THIS SOFTWARE IS PROVIDED BY Benno Rice ``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 TOOLS GMBH 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.
     *      $NetBSD: machdep.c,v 1.74.2.1 2000/11/01 16:13:48 tv Exp $
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/5.1/sys/powerpc/powerpc/machdep.c 114983 2003-05-13 20:36:02Z jhb $");
    
    #include "opt_ddb.h"
    #include "opt_compat.h"
    #include "opt_msgbuf.h"
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/eventhandler.h>
    #include <sys/imgact.h>
    #include <sys/sysproto.h>
    #include <sys/lock.h>
    #include <sys/mutex.h>
    #include <sys/ktr.h>
    #include <sys/signalvar.h>
    #include <sys/kernel.h>
    #include <sys/proc.h>
    #include <sys/malloc.h>
    #include <sys/reboot.h>
    #include <sys/bio.h>
    #include <sys/buf.h>
    #include <sys/bus.h>
    #include <sys/mbuf.h>
    #include <sys/vmmeter.h>
    #include <sys/msgbuf.h>
    #include <sys/exec.h>
    #include <sys/sysctl.h>
    #include <sys/uio.h>
    #include <sys/linker.h>
    #include <sys/cons.h>
    #include <sys/ucontext.h>
    #include <sys/sysent.h>
    #include <net/netisr.h>
    #include <vm/vm.h>
    #include <vm/vm_kern.h>
    #include <vm/vm_page.h>
    #include <vm/vm_map.h>
    #include <vm/vm_extern.h>
    #include <vm/vm_object.h>
    #include <vm/vm_pager.h>
    #include <sys/user.h>
    #include <sys/ptrace.h>
   #include <machine/bat.h>
   #include <machine/clock.h>
   #include <machine/md_var.h>
   #include <machine/metadata.h>
   #include <machine/reg.h>
   #include <machine/fpu.h>
   #include <machine/vmparam.h>
   #include <machine/elf.h>
   #include <machine/trap.h>
   #include <machine/powerpc.h>
   #include <dev/ofw/openfirm.h>
   #include <ddb/ddb.h>
   #include <sys/vnode.h>
   #include <machine/sigframe.h>
   
   int cold = 1;
   
   char            pcpu0[PAGE_SIZE];
   char            uarea0[UAREA_PAGES * PAGE_SIZE];
   struct          trapframe frame0;
   
   vm_offset_t     kstack0;
   vm_offset_t     kstack0_phys;
   
   char            machine[] = "powerpc";
   SYSCTL_STRING(_hw, HW_MACHINE, machine, CTLFLAG_RD, machine, 0, "");
   
   static char     model[128];
   SYSCTL_STRING(_hw, HW_MODEL, model, CTLFLAG_RD, model, 0, "");
   
   static int cacheline_size = CACHELINESIZE;
   SYSCTL_INT(_machdep, CPU_CACHELINE, cacheline_size,
              CTLFLAG_RD, &cacheline_size, 0, "");
   
   char            bootpath[256];
   
   #ifdef DDB
   /* start and end of kernel symbol table */
   void            *ksym_start, *ksym_end;
   #endif /* DDB */
   
   static void     cpu_startup(void *);
   SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL)
   
   void            powerpc_init(u_int, u_int, u_int, void *);
   
   int             save_ofw_mapping(void);
   int             restore_ofw_mapping(void);
   
   void            install_extint(void (*)(void));
   
   int             setfault(faultbuf);             /* defined in locore.S */
   
   long            Maxmem = 0;
   
   struct pmap     ofw_pmap;
   extern int      ofmsr;
   
   struct bat      battable[16];
   
   struct kva_md_info kmi;
   
   static void
   powerpc_ofw_shutdown(void *junk, int howto)
   {
           if (howto & RB_HALT) {
                   OF_exit();
           }
   }
   
   static void
   cpu_startup(void *dummy)
   {
   
           /*
            * Initialise the decrementer-based clock.
            */
           decr_init();
   
           /*
            * Good {morning,afternoon,evening,night}.
            */
           cpu_setup(PCPU_GET(cpuid));
   
           /* startrtclock(); */
   #ifdef PERFMON
           perfmon_init();
   #endif
           printf("real memory  = %ld (%ld MB)\n", ptoa(Maxmem),
               ptoa(Maxmem) / 1048576);
   
           /*
            * Display any holes after the first chunk of extended memory.
            */
           if (bootverbose) {
                   int indx;
   
                   printf("Physical memory chunk(s):\n");
                   for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) {
                           int size1 = phys_avail[indx + 1] - phys_avail[indx];
   
                           printf("0x%08x - 0x%08x, %d bytes (%d pages)\n",
                               phys_avail[indx], phys_avail[indx + 1] - 1, size1,
                               size1 / PAGE_SIZE);
                   }
           }
   
           vm_ksubmap_init(&kmi);
   
           printf("avail memory = %ld (%ld MB)\n", ptoa(cnt.v_free_count),
               ptoa(cnt.v_free_count) / 1048576);
   
           /*
            * Set up buffers, so they can be used to read disk labels.
            */
           bufinit();
           vm_pager_bufferinit();
   
           EVENTHANDLER_REGISTER(shutdown_final, powerpc_ofw_shutdown, 0,
               SHUTDOWN_PRI_LAST);
   
   #ifdef SMP
           /*
            * OK, enough kmem_alloc/malloc state should be up, lets get on with it!
            */
           mp_start();                     /* fire up the secondaries */
           mp_announce();
   #endif  /* SMP */
   }
   
   extern char     kernel_text[], _end[];
   
   extern void     *trapcode, *trapsize;
   extern void     *alitrap, *alisize;
   extern void     *dsitrap, *dsisize;
   extern void     *isitrap, *isisize;
   extern void     *decrint, *decrsize;
   extern void     *tlbimiss, *tlbimsize;
   extern void     *tlbdlmiss, *tlbdlmsize;
   extern void     *tlbdsmiss, *tlbdsmsize;
   extern void     *extint, *extsize;
   
   #if 0 /* XXX: interrupt handler.  We'll get to this later */
   extern void     ext_intr(void);
   #endif
   
   #ifdef DDB
   extern          ddblow, ddbsize;
   #endif
   #ifdef IPKDB
   extern          ipkdblow, ipkdbsize;
   #endif
   
   void
   powerpc_init(u_int startkernel, u_int endkernel, u_int basekernel, void *mdp)
   {
           struct          pcpu *pc;
           vm_offset_t     end, off;
           void            *kmdp;
   
           end = 0;
           kmdp = NULL;
   
           /*
            * Parse metadata if present and fetch parameters.  Must be done
            * before 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);
                   }
           }
   
           /*
            * Initialize the console before printing anything.
            */
           cninit();
   
           /*
            * Complain if there is no metadata.
            */
           if (mdp == NULL || kmdp == NULL) {
                   printf("powerpc_init: no loader metadata.\n");
           }
   
   #ifdef DDB
           kdb_init();
   #endif
           /*
            * XXX: Initialize the interrupt tables.
            */
           bcopy(&trapcode, (void *)EXC_MCHK, (size_t)&trapsize);
           bcopy(&dsitrap,  (void *)EXC_DSI,  (size_t)&dsisize);
           bcopy(&isitrap,  (void *)EXC_ISI,  (size_t)&isisize);
           bcopy(&trapcode, (void *)EXC_EXI,  (size_t)&trapsize);
           bcopy(&trapcode, (void *)EXC_ALI,  (size_t)&trapsize);
           bcopy(&trapcode, (void *)EXC_PGM,  (size_t)&trapsize);
           bcopy(&trapcode, (void *)EXC_FPU,  (size_t)&trapsize);
           bcopy(&trapcode, (void *)EXC_DECR, (size_t)&trapsize);
           bcopy(&trapcode, (void *)EXC_SC,   (size_t)&trapsize);
           bcopy(&trapcode, (void *)EXC_TRC,  (size_t)&trapsize);
           __syncicache(EXC_RSVD, EXC_LAST - EXC_RSVD);
   
           /*
            * Start initializing proc0 and thread0.
            */
           proc_linkup(&proc0, &ksegrp0, &kse0, &thread0);
           proc0.p_uarea = (struct user *)uarea0;
           proc0.p_stats = &proc0.p_uarea->u_stats;
           thread0.td_frame = &frame0;
   
           /*
            * Set up per-cpu data.
            */
           pc = (struct pcpu *)(pcpu0 + PAGE_SIZE) - 1;
           pcpu_init(pc, 0, sizeof(struct pcpu));
           pc->pc_curthread = &thread0;
           pc->pc_curpcb = thread0.td_pcb;
           pc->pc_cpuid = 0;
           /* pc->pc_mid = mid; */
   
           __asm __volatile("mtsprg 0, %0" :: "r"(pc));
   
           mutex_init();
   
           /*
            * Make sure translation has been enabled
            */
           mtmsr(mfmsr() | PSL_IR|PSL_DR|PSL_ME|PSL_RI);
   
           /*
            * Initialise virtual memory.
            */
           pmap_bootstrap(startkernel, endkernel);
   
           /*
            * Initialize tunables.
            */
           init_param1();
           init_param2(physmem);
   
           /*
            * Finish setting up thread0.
            */
           thread0.td_kstack = kstack0;
           thread0.td_pcb = (struct pcb *)
               (thread0.td_kstack + KSTACK_PAGES * PAGE_SIZE) - 1;
   
           /*
            * Map and initialise the message buffer.
            */
           for (off = 0; off < round_page(MSGBUF_SIZE); off += PAGE_SIZE)
                   pmap_kenter((vm_offset_t)msgbufp + off, msgbuf_phys + off);
           msgbufinit(msgbufp, MSGBUF_SIZE);
   }
   
   void
   bzero(void *buf, size_t len)
   {
           caddr_t p;
   
           p = buf;
   
           while (((vm_offset_t) p & (sizeof(u_long) - 1)) && len) {
                   *p++ = 0;
                   len--;
           }
   
           while (len >= sizeof(u_long) * 8) {
                   *(u_long*) p = 0;
                   *((u_long*) p + 1) = 0;
                   *((u_long*) p + 2) = 0;
                   *((u_long*) p + 3) = 0;
                   len -= sizeof(u_long) * 8;
                   *((u_long*) p + 4) = 0;
                   *((u_long*) p + 5) = 0;
                   *((u_long*) p + 6) = 0;
                   *((u_long*) p + 7) = 0;
                   p += sizeof(u_long) * 8;
           }
   
           while (len >= sizeof(u_long)) {
                   *(u_long*) p = 0;
                   len -= sizeof(u_long);
                   p += sizeof(u_long);
           }
   
           while (len) {
                   *p++ = 0;
                   len--;
           }
   }
   
   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 proc *p;
           int oonstack, rndfsize;
   
           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;
           oonstack = sigonstack(tf->fixreg[1]);
   
           rndfsize = ((sizeof(sf) + 15) / 16) * 16;
   
           CTR4(KTR_SIG, "sendsig: td=%p (%s) catcher=%p sig=%d", td, p->p_comm,
                catcher, sig);
   
           /*
            * Save user context
            */
           memset(&sf, 0, sizeof(sf));
           sf.sf_uc.uc_sigmask = *mask;
           sf.sf_uc.uc_stack = p->p_sigstk;
           sf.sf_uc.uc_stack.ss_flags = (p->p_flag & P_ALTSTACK)
               ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
   
           sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0;
           memcpy(&sf.sf_uc.uc_mcontext.mc_frame, tf, sizeof(struct trapframe));
   
           /*
            * Allocate and validate space for the signal handler context. 
            */
           if ((p->p_flag & P_ALTSTACK) != 0 && !oonstack &&
               SIGISMEMBER(psp->ps_sigonstack, sig)) {
                   sfp = (struct sigframe *)((caddr_t)p->p_sigstk.ss_sp +
                      p->p_sigstk.ss_size - rndfsize);
           } else {
                   sfp = (struct sigframe *)(tf->fixreg[1] - rndfsize);
           }
   
           /* 
            * Translate the signal if appropriate (Linux emu ?)
            */
           if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize)
                   sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];       
   
           /*
            * Save the floating-point state, if necessary, then copy it. 
            */
           /* XXX */
   
           /*
            * Set up the registers to return to sigcode.
            *
            *   r1/sp - sigframe ptr
            *   lr    - sig function, dispatched to by blrl in trampoline
            *   r3    - sig number
            *   r4    - SIGINFO ? &siginfo : exception code
            *   r5    - user context
            *   srr0  - trampoline function addr
            */
           tf->lr = (register_t)catcher;
           tf->fixreg[1] = (register_t)sfp;
           tf->fixreg[FIRSTARG] = sig;
           tf->fixreg[FIRSTARG+2] = (register_t)&sfp->sf_uc;
           if (SIGISMEMBER(psp->ps_siginfo, sig)) {
                   /* 
                    * Signal handler installed with SA_SIGINFO.
                    */
                   tf->fixreg[FIRSTARG+1] = (register_t)&sfp->sf_si;
   
                   /*
                    * Fill siginfo structure.
                    */
                   sf.sf_si.si_signo = sig;
                   sf.sf_si.si_code = code;
                   sf.sf_si.si_addr = (void *)tf->srr0;
           } else {
                   /* Old FreeBSD-style arguments. */
                   tf->fixreg[FIRSTARG+1] = code;
           }
           mtx_unlock(&psp->ps_mtx);
           PROC_UNLOCK(p);
   
           tf->srr0 = (register_t)(PS_STRINGS - *(p->p_sysent->sv_szsigcode));
   
           /*
            * copy the frame out to userland.
            */
           if (copyout((caddr_t)&sf, (caddr_t)sfp, sizeof(sf)) != 0) {
                   /*
                    * Process has trashed its stack. Kill it.
                    */
                   CTR2(KTR_SIG, "sendsig: sigexit td=%p sfp=%p", td, sfp);
                   PROC_LOCK(p);
                   sigexit(td, SIGILL);
           }
   
           CTR3(KTR_SIG, "sendsig: return td=%p pc=%#x sp=%#x", td, 
                tf->srr0, tf->fixreg[1]);
   
           PROC_LOCK(p);
           mtx_lock(&psp->ps_mtx);
   }
   
   int
   sigreturn(struct thread *td, struct sigreturn_args *uap)
   {
           struct trapframe *tf;
           struct proc *p;
           ucontext_t uc;
   
           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);
           }
   
           /*
            * Don't let the user set privileged MSR bits
            */
           tf = td->td_frame;
           if ((uc.uc_mcontext.mc_frame.srr1 & PSL_USERSTATIC) != 
               (tf->srr1 & PSL_USERSTATIC)) {
                   return (EINVAL);
           }
   
           /*
            * Restore the user-supplied context
            */
           memcpy(tf, &uc.uc_mcontext.mc_frame, sizeof(struct trapframe));
   
           p = td->td_proc;
           PROC_LOCK(p);
           td->td_sigmask = uc.uc_sigmask;
           SIG_CANTMASK(td->td_sigmask);
           signotify(td);
           PROC_UNLOCK(p);
   
           /*
            * Restore FP state
            */
           /* XXX */
   
           CTR3(KTR_SIG, "sigreturn: return td=%p pc=%#x sp=%#x",
                td, tf->srr0, tf->fixreg[1]);
   
           return (EJUSTRETURN);
   }
   
   #ifdef COMPAT_FREEBSD4
   int
   freebsd4_sigreturn(struct thread *td, struct freebsd4_sigreturn_args *uap)
   {
   
           return sigreturn(td, (struct sigreturn_args *)uap);
   }
   #endif
   
   int
   get_mcontext(struct thread *td, mcontext_t *mcp, int clear_ret)
   {
   
           return (ENOSYS);
   }
   
   int
   set_mcontext(struct thread *td, const mcontext_t *mcp)
   {
   
           return (ENOSYS);
   }
   
   void
   cpu_boot(int howto)
   {
   }
   
   /*
    * Shutdown the CPU as much as possible.
    */
   void
   cpu_halt(void)
   {
   
           OF_exit();
   }
   
   /*
    * Set set up registers on exec.
    */
   void
   exec_setregs(struct thread *td, u_long entry, u_long stack, u_long ps_strings)
   {
           struct trapframe        *tf;
           struct ps_strings       arginfo;
   
           tf = trapframe(td);
           bzero(tf, sizeof *tf);
           tf->fixreg[1] = -roundup(-stack + 8, 16);
   
           /*
            * XXX Machine-independent code has already copied arguments and
            * XXX environment to userland.  Get them back here.
            */
           (void)copyin((char *)PS_STRINGS, &arginfo, sizeof(arginfo));
   
           /*
            * Set up arguments for _start():
            *      _start(argc, argv, envp, obj, cleanup, ps_strings);
            *
            * Notes:
            *      - obj and cleanup are the auxilliary and termination
            *        vectors.  They are fixed up by ld.elf_so.
            *      - ps_strings is a NetBSD extention, and will be
            *        ignored by executables which are strictly
            *        compliant with the SVR4 ABI.
            *
            * XXX We have to set both regs and retval here due to different
            * XXX calling convention in trap.c and init_main.c.
            */
           /*
            * XXX PG: these get overwritten in the syscall return code.
            * execve() should return EJUSTRETURN, like it does on NetBSD.
            * Emulate by setting the syscall return value cells. The
            * registers still have to be set for init's fork trampoline.
            */
           td->td_retval[0] = arginfo.ps_nargvstr;
           td->td_retval[1] = (register_t)arginfo.ps_argvstr;
           tf->fixreg[3] = arginfo.ps_nargvstr;
           tf->fixreg[4] = (register_t)arginfo.ps_argvstr;
           tf->fixreg[5] = (register_t)arginfo.ps_envstr;
           tf->fixreg[6] = 0;                      /* auxillary vector */
           tf->fixreg[7] = 0;                      /* termination vector */
           tf->fixreg[8] = (register_t)PS_STRINGS; /* NetBSD extension */
   
           tf->srr0 = entry;
           tf->srr1 = PSL_MBO | PSL_USERSET | PSL_FE_DFLT;
           td->td_pcb->pcb_flags = 0;
   }
   
   #if !defined(DDB)
   void
   Debugger(const char *msg)
   {
   
           printf("Debugger(\"%s\") called.\n", msg);
   }
   #endif /* !defined(DDB) */
   
   /* XXX: dummy {fill,set}_[fp]regs */
   int
   fill_regs(struct thread *td, struct reg *regs)
   {
   
           return (ENOSYS);
   }
   
   int
   fill_dbregs(struct thread *td, struct dbreg *dbregs)
   {
   
           return (ENOSYS);
   }
   
   int
   fill_fpregs(struct thread *td, struct fpreg *fpregs)
   {
   
           return (ENOSYS);
   }
   
   int
   set_regs(struct thread *td, struct reg *regs)
   {
   
           return (ENOSYS);
   }
   
   int
   set_dbregs(struct thread *td, struct dbreg *dbregs)
   {
   
           return (ENOSYS);
   }
   
   int
   set_fpregs(struct thread *td, struct fpreg *fpregs)
   {
   
           return (ENOSYS);
   }
   
   int
   ptrace_set_pc(struct thread *td, unsigned long addr)
   {
   
           /* XXX: coming soon... */
           return (ENOSYS);
   }
   
   int
   ptrace_single_step(struct thread *td)
   {
   
           /* XXX: coming soon... */
           return (ENOSYS);
   }
   
   /*
    * Initialise a struct pcpu.
    */
   void
   cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t sz)
   {
   
           pcpu->pc_current_asngen = 1;
   }
   
   /*
    * kcopy(const void *src, void *dst, size_t len);
    *
    * Copy len bytes from src to dst, aborting if we encounter a fatal
    * page fault.
    *
    * kcopy() _must_ save and restore the old fault handler since it is
    * called by uiomove(), which may be in the path of servicing a non-fatal
    * page fault.
    */
   int
   kcopy(const void *src, void *dst, size_t len)
   {
           struct thread   *td;
           faultbuf        env, *oldfault;
           int             rv;
   
           td = PCPU_GET(curthread);
           oldfault = td->td_pcb->pcb_onfault;
           if ((rv = setfault(env)) != 0) {
                   td->td_pcb->pcb_onfault = oldfault;
                   return rv;
           }
   
           memcpy(dst, src, len);
   
           td->td_pcb->pcb_onfault = oldfault;
           return (0);
   }
   
   
   intptr_t
   casuptr(intptr_t *p, intptr_t old, intptr_t new)
   {
           return (-1);
   }
   

Cache object: e48e1a26967bea72ac66df4d9f2162b4