The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*-
    2  * Copyright (c) 1982, 1986 The Regents of the University of California.
    3  * Copyright (c) 1989, 1990 William Jolitz
    4  * Copyright (c) 1994 John Dyson
    5  * All rights reserved.
    6  *
    7  * This code is derived from software contributed to Berkeley by
    8  * the Systems Programming Group of the University of Utah Computer
    9  * Science Department, and William Jolitz.
   10  *
   11  * Redistribution and use in source and binary forms, with or without
   12  * modification, are permitted provided that the following conditions
   13  * are met:
   14  * 1. Redistributions of source code must retain the above copyright
   15  *    notice, this list of conditions and the following disclaimer.
   16  * 2. Redistributions in binary form must reproduce the above copyright
   17  *    notice, this list of conditions and the following disclaimer in the
   18  *    documentation and/or other materials provided with the distribution.
   19  * 3. All advertising materials mentioning features or use of this software
   20  *    must display the following acknowledgement:
   21  *      This product includes software developed by the University of
   22  *      California, Berkeley and its contributors.
   23  * 4. Neither the name of the University nor the names of its contributors
   24  *    may be used to endorse or promote products derived from this software
   25  *    without specific prior written permission.
   26  *
   27  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   30  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   31  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   35  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   36  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   37  * SUCH DAMAGE.
   38  *
   39  *      from: @(#)vm_machdep.c  7.3 (Berkeley) 5/13/91
   40  *      Utah $Hdr: vm_machdep.c 1.16.1.1 89/06/23$
   41  * $FreeBSD: releng/11.2/sys/powerpc/powerpc/vm_machdep.c 331722 2018-03-29 02:50:57Z eadler $
   42  */
   43 /*-
   44  * Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
   45  * All rights reserved.
   46  *
   47  * Author: Chris G. Demetriou
   48  *
   49  * Permission to use, copy, modify and distribute this software and
   50  * its documentation is hereby granted, provided that both the copyright
   51  * notice and this permission notice appear in all copies of the
   52  * software, derivative works or modified versions, and any portions
   53  * thereof, and that both notices appear in supporting documentation.
   54  *
   55  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
   56  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
   57  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
   58  *
   59  * Carnegie Mellon requests users of this software to return to
   60  *
   61  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
   62  *  School of Computer Science
   63  *  Carnegie Mellon University
   64  *  Pittsburgh PA 15213-3890
   65  *
   66  * any improvements or extensions that they make and grant Carnegie the
   67  * rights to redistribute these changes.
   68  */
   69 
   70 #include <sys/param.h>
   71 #include <sys/systm.h>
   72 #include <sys/proc.h>
   73 #include <sys/malloc.h>
   74 #include <sys/bio.h>
   75 #include <sys/buf.h>
   76 #include <sys/ktr.h>
   77 #include <sys/lock.h>
   78 #include <sys/mutex.h>
   79 #include <sys/vnode.h>
   80 #include <sys/vmmeter.h>
   81 #include <sys/kernel.h>
   82 #include <sys/mbuf.h>
   83 #include <sys/sysctl.h>
   84 #include <sys/sysent.h>
   85 #include <sys/unistd.h>
   86 
   87 #include <machine/cpu.h>
   88 #include <machine/fpu.h>
   89 #include <machine/frame.h>
   90 #include <machine/md_var.h>
   91 #include <machine/pcb.h>
   92 
   93 #include <dev/ofw/openfirm.h>
   94 
   95 #include <vm/vm.h>
   96 #include <vm/vm_param.h>
   97 #include <vm/vm_kern.h>
   98 #include <vm/vm_page.h>
   99 #include <vm/vm_map.h>
  100 #include <vm/vm_extern.h>
  101 
  102 /*
  103  * Finish a fork operation, with process p2 nearly set up.
  104  * Copy and update the pcb, set up the stack so that the child
  105  * ready to run and return to user mode.
  106  */
  107 void
  108 cpu_fork(struct thread *td1, struct proc *p2, struct thread *td2, int flags)
  109 {
  110         struct  trapframe *tf;
  111         struct  callframe *cf;
  112         struct  pcb *pcb;
  113 
  114         KASSERT(td1 == curthread || td1 == &thread0,
  115             ("cpu_fork: p1 not curproc and not proc0"));
  116         CTR3(KTR_PROC, "cpu_fork: called td1=%p p2=%p flags=%x",
  117             td1, p2, flags);
  118 
  119         if ((flags & RFPROC) == 0)
  120                 return;
  121 
  122         pcb = (struct pcb *)((td2->td_kstack +
  123             td2->td_kstack_pages * PAGE_SIZE - sizeof(struct pcb)) & ~0x2fUL);
  124         td2->td_pcb = pcb;
  125 
  126         /* Copy the pcb */
  127         bcopy(td1->td_pcb, pcb, sizeof(struct pcb));
  128 
  129         /*
  130          * Create a fresh stack for the new process.
  131          * Copy the trap frame for the return to user mode as if from a
  132          * syscall.  This copies most of the user mode register values.
  133          */
  134         tf = (struct trapframe *)pcb - 1;
  135         bcopy(td1->td_frame, tf, sizeof(*tf));
  136 
  137         /* Set up trap frame. */
  138         tf->fixreg[FIRSTARG] = 0;
  139         tf->fixreg[FIRSTARG + 1] = 0;
  140         tf->cr &= ~0x10000000;
  141 
  142         td2->td_frame = tf;
  143 
  144         cf = (struct callframe *)tf - 1;
  145         memset(cf, 0, sizeof(struct callframe));
  146         #if defined(__powerpc64__) && (!defined(_CALL_ELF) || _CALL_ELF == 1)
  147         cf->cf_toc = ((register_t *)fork_return)[1];
  148         #endif
  149         cf->cf_func = (register_t)fork_return;
  150         cf->cf_arg0 = (register_t)td2;
  151         cf->cf_arg1 = (register_t)tf;
  152 
  153         pcb->pcb_sp = (register_t)cf;
  154         KASSERT(pcb->pcb_sp % 16 == 0, ("stack misaligned"));
  155         #if defined(__powerpc64__) && (!defined(_CALL_ELF) || _CALL_ELF == 1)
  156         pcb->pcb_lr = ((register_t *)fork_trampoline)[0];
  157         pcb->pcb_toc = ((register_t *)fork_trampoline)[1];
  158         #else
  159         pcb->pcb_lr = (register_t)fork_trampoline;
  160         pcb->pcb_context[0] = pcb->pcb_lr;
  161         #endif
  162         #ifdef AIM
  163         pcb->pcb_cpu.aim.usr_vsid = 0;
  164         #endif
  165 
  166         /* Setup to release spin count in fork_exit(). */
  167         td2->td_md.md_spinlock_count = 1;
  168         td2->td_md.md_saved_msr = PSL_KERNSET;
  169 
  170         /*
  171          * Now cpu_switch() can schedule the new process.
  172          */
  173 }
  174 
  175 /*
  176  * Intercept the return address from a freshly forked process that has NOT
  177  * been scheduled yet.
  178  *
  179  * This is needed to make kernel threads stay in kernel mode.
  180  */
  181 void
  182 cpu_fork_kthread_handler(struct thread *td, void (*func)(void *), void *arg)
  183 {
  184         struct callframe *cf;
  185 
  186         CTR4(KTR_PROC, "%s called with td=%p func=%p arg=%p",
  187             __func__, td, func, arg);
  188 
  189         cf = (struct callframe *)td->td_pcb->pcb_sp;
  190 
  191         cf->cf_func = (register_t)func;
  192         cf->cf_arg0 = (register_t)arg;
  193 }
  194 
  195 void
  196 cpu_exit(struct thread *td)
  197 {
  198 
  199 }
  200 
  201 /*
  202  * Software interrupt handler for queued VM system processing.
  203  */
  204 void
  205 swi_vm(void *dummy)
  206 {
  207 
  208         if (busdma_swi_pending != 0)
  209                 busdma_swi();
  210 }
  211 
  212 /*
  213  * Tell whether this address is in some physical memory region.
  214  * Currently used by the kernel coredump code in order to avoid
  215  * dumping the ``ISA memory hole'' which could cause indefinite hangs,
  216  * or other unpredictable behaviour.
  217  */
  218 int
  219 is_physical_memory(vm_offset_t addr)
  220 {
  221 
  222         /*
  223          * stuff other tests for known memory-mapped devices (PCI?)
  224          * here
  225          */
  226         return (1);
  227 }
  228 
  229 /*
  230  * CPU threading functions related to the VM layer. These could be used
  231  * to map the SLB bits required for the kernel stack instead of forcing a
  232  * fixed-size KVA.
  233  */
  234 
  235 void
  236 cpu_thread_swapin(struct thread *td)
  237 {
  238 
  239 }
  240 
  241 void
  242 cpu_thread_swapout(struct thread *td)
  243 {
  244 
  245 }
  246 

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