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

     /*-
      * SPDX-License-Identifier: (BSD-4-Clause AND MIT-CMU)
      *
      * Copyright (c) 1982, 1986 The Regents of the University of California.
      * Copyright (c) 1989, 1990 William Jolitz
      * Copyright (c) 1994 John Dyson
      * All rights reserved.
      *
      * This code is derived from software contributed to Berkeley by
     * the Systems Programming Group of the University of Utah Computer
     * Science Department, and 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.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 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: @(#)vm_machdep.c  7.3 (Berkeley) 5/13/91
     *      Utah $Hdr: vm_machdep.c 1.16.1.1 89/06/23$
     * $FreeBSD$
     */
    /*-
     * Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
     * All rights reserved.
     *
     * Author: Chris G. Demetriou
     *
     * Permission to use, copy, modify and distribute this software and
     * its documentation is hereby granted, provided that both the copyright
     * notice and this permission notice appear in all copies of the
     * software, derivative works or modified versions, and any portions
     * thereof, and that both notices appear in supporting documentation.
     *
     * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
     * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     *
     * Carnegie Mellon requests users of this software to return to
     *
     *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
     *  School of Computer Science
     *  Carnegie Mellon University
     *  Pittsburgh PA 15213-3890
     *
     * any improvements or extensions that they make and grant Carnegie the
     * rights to redistribute these changes.
     */
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/proc.h>
    #include <sys/malloc.h>
    #include <sys/bio.h>
    #include <sys/buf.h>
    #include <sys/ktr.h>
    #include <sys/lock.h>
    #include <sys/mutex.h>
    #include <sys/vnode.h>
    #include <sys/vmmeter.h>
    #include <sys/kernel.h>
    #include <sys/mbuf.h>
    #include <sys/sysctl.h>
    #include <sys/sysent.h>
    #include <sys/unistd.h>
    
    #include <machine/cpu.h>
    #include <machine/fpu.h>
    #include <machine/frame.h>
    #include <machine/md_var.h>
    #include <machine/pcb.h>
    #include <machine/reg.h>
    
    #include <dev/ofw/openfirm.h>
    
    #include <vm/vm.h>
    #include <vm/vm_param.h>
   #include <vm/vm_kern.h>
   #include <vm/vm_page.h>
   #include <vm/vm_map.h>
   #include <vm/vm_extern.h>
   
   /*
    * Finish a fork operation, with process p2 nearly set up.
    * Copy and update the pcb, set up the stack so that the child
    * ready to run and return to user mode.
    */
   void
   cpu_fork(struct thread *td1, struct proc *p2, struct thread *td2, int flags)
   {
           struct  trapframe *tf;
           struct  callframe *cf;
           struct  pcb *pcb;
   
           KASSERT(td1 == curthread || td1 == &thread0,
               ("cpu_fork: p1 not curproc and not proc0"));
           CTR3(KTR_PROC, "cpu_fork: called td1=%p p2=%p flags=%x",
               td1, p2, flags);
   
           if ((flags & RFPROC) == 0)
                   return;
   
           /* Ensure td1 is up to date before copy. */
           if (td1 == curthread)
                   cpu_save_thread_regs(td1);
   
           pcb = (struct pcb *)((td2->td_kstack +
               td2->td_kstack_pages * PAGE_SIZE - sizeof(struct pcb)) & ~0x2fUL);
           td2->td_pcb = pcb;
   
           /* Copy the pcb */
           bcopy(td1->td_pcb, pcb, sizeof(struct pcb));
   
           /*
            * Create a fresh stack for the new process.
            * Copy the trap frame for the return to user mode as if from a
            * syscall.  This copies most of the user mode register values.
            */
           tf = (struct trapframe *)pcb - 1;
           bcopy(td1->td_frame, tf, sizeof(*tf));
   
           /* Set up trap frame. */
           tf->fixreg[FIRSTARG] = 0;
           tf->fixreg[FIRSTARG + 1] = 0;
           tf->cr &= ~0x10000000;
   
           td2->td_frame = tf;
   
           cf = (struct callframe *)tf - 1;
           memset(cf, 0, sizeof(struct callframe));
           #if defined(__powerpc64__) && (!defined(_CALL_ELF) || _CALL_ELF == 1)
           cf->cf_toc = ((register_t *)fork_return)[1];
           #endif
           cf->cf_func = (register_t)fork_return;
           cf->cf_arg0 = (register_t)td2;
           cf->cf_arg1 = (register_t)tf;
   
           pcb->pcb_sp = (register_t)cf;
           KASSERT(pcb->pcb_sp % 16 == 0, ("stack misaligned"));
           #if defined(__powerpc64__) && (!defined(_CALL_ELF) || _CALL_ELF == 1)
           pcb->pcb_lr = ((register_t *)fork_trampoline)[0];
           pcb->pcb_toc = ((register_t *)fork_trampoline)[1];
           #else
           pcb->pcb_lr = (register_t)fork_trampoline;
           pcb->pcb_context[0] = pcb->pcb_lr;
           #endif
           #ifdef AIM
           pcb->pcb_cpu.aim.usr_vsid = 0;
           #endif
   
           /* Setup to release spin count in fork_exit(). */
           td2->td_md.md_spinlock_count = 1;
           td2->td_md.md_saved_msr = psl_kernset;
   
           /*
            * Now cpu_switch() can schedule the new process.
            */
   }
   
   /*
    * Intercept the return address from a freshly forked process that has NOT
    * been scheduled yet.
    *
    * This is needed to make kernel threads stay in kernel mode.
    */
   void
   cpu_fork_kthread_handler(struct thread *td, void (*func)(void *), void *arg)
   {
           struct callframe *cf;
   
           CTR4(KTR_PROC, "%s called with td=%p func=%p arg=%p",
               __func__, td, func, arg);
   
           cf = (struct callframe *)td->td_pcb->pcb_sp;
   
           #if defined(__powerpc64__) && (!defined(_CALL_ELF) || _CALL_ELF == 1)
           cf->cf_toc = ((register_t *)func)[1];
           #endif
           cf->cf_func = (register_t)func;
           cf->cf_arg0 = (register_t)arg;
   }
   
   void
   cpu_exit(struct thread *td)
   {
   
   }
   
   /*
    * CPU threading functions related to the VM layer. These could be used
    * to map the SLB bits required for the kernel stack instead of forcing a
    * fixed-size KVA.
    */
   
   void
   cpu_thread_swapin(struct thread *td)
   {
   
   }
   
   void
   cpu_thread_swapout(struct thread *td)
   {
   
   }
   
   bool
   cpu_exec_vmspace_reuse(struct proc *p __unused, vm_map_t map __unused)
   {
   
           return (true);
   }
   
   int
   cpu_procctl(struct thread *td __unused, int idtype __unused, id_t id __unused,
       int com __unused, void *data __unused)
   {
   
           return (EINVAL);
   }

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