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/6.1/sys/powerpc/powerpc/vm_machdep.c 147889 2005-07-10 23:31:11Z davidxu $
   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/sf_buf.h>
   84 #include <sys/sysctl.h>
   85 #include <sys/unistd.h>
   86 
   87 #include <machine/clock.h>
   88 #include <machine/cpu.h>
   89 #include <machine/fpu.h>
   90 #include <machine/frame.h>
   91 #include <machine/md_var.h>
   92 #include <machine/pcb.h>
   93 
   94 #include <dev/ofw/openfirm.h>
   95 
   96 #include <vm/vm.h>
   97 #include <vm/vm_param.h>
   98 #include <vm/vm_kern.h>
   99 #include <vm/vm_page.h>
  100 #include <vm/vm_map.h>
  101 #include <vm/vm_extern.h>
  102 
  103 /*
  104  * Finish a fork operation, with process p2 nearly set up.
  105  * Copy and update the pcb, set up the stack so that the child
  106  * ready to run and return to user mode.
  107  */
  108 void
  109 cpu_fork(struct thread *td1, struct proc *p2, struct thread *td2, int flags)
  110 {
  111         struct  proc *p1;
  112         struct  trapframe *tf;
  113         struct  callframe *cf;
  114         struct  pcb *pcb;
  115 
  116         KASSERT(td1 == curthread || td1 == &thread0,
  117             ("cpu_fork: p1 not curproc and not proc0"));
  118         CTR3(KTR_PROC, "cpu_fork: called td1=%08x p2=%08x flags=%x", (u_int)td1, (u_int)p2, flags);
  119 
  120         if ((flags & RFPROC) == 0)
  121                 return;
  122 
  123         p1 = td1->td_proc;
  124 
  125         pcb = (struct pcb *)((td2->td_kstack +
  126             td2->td_kstack_pages * PAGE_SIZE - sizeof(struct pcb)) & ~0x2fU);
  127         td2->td_pcb = pcb;
  128 
  129         /* Copy the pcb */
  130         bcopy(td1->td_pcb, pcb, sizeof(struct pcb));
  131 
  132         /*
  133          * Create a fresh stack for the new process.
  134          * Copy the trap frame for the return to user mode as if from a
  135          * syscall.  This copies most of the user mode register values.
  136          */
  137         tf = (struct trapframe *)pcb - 1;
  138         bcopy(td1->td_frame, tf, sizeof(*tf));
  139 
  140         /* Set up trap frame. */
  141         tf->fixreg[FIRSTARG] = 0;
  142         tf->fixreg[FIRSTARG + 1] = 0;
  143         tf->cr &= ~0x10000000;
  144 
  145         td2->td_frame = tf;
  146 
  147         cf = (struct callframe *)tf - 1;
  148         memset(cf, 0, sizeof(struct callframe));
  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         pcb->pcb_lr = (register_t)fork_trampoline;
  155         pcb->pcb_usr = kernel_pmap->pm_sr[USER_SR];
  156 
  157         /* Setup to release sched_lock in fork_exit(). */
  158         td2->td_md.md_spinlock_count = 1;
  159         td2->td_md.md_saved_msr = PSL_KERNSET;
  160 
  161         /*
  162          * Now cpu_switch() can schedule the new process.
  163          */
  164 }
  165 
  166 /*
  167  * Intercept the return address from a freshly forked process that has NOT
  168  * been scheduled yet.
  169  *
  170  * This is needed to make kernel threads stay in kernel mode.
  171  */
  172 void
  173 cpu_set_fork_handler(td, func, arg)
  174         struct thread *td;
  175         void (*func)(void *);
  176         void *arg;
  177 {
  178         struct  callframe *cf;
  179 
  180         CTR3(KTR_PROC, "cpu_set_fork_handler: called with td=%08x func=%08x arg=%08x",
  181             (u_int)td, (u_int)func, (u_int)arg);
  182 
  183         cf = (struct callframe *)td->td_pcb->pcb_sp;
  184 
  185         cf->cf_func = (register_t)func;
  186         cf->cf_arg0 = (register_t)arg;
  187 }
  188 
  189 void
  190 cpu_exit(td)
  191         register struct thread *td;
  192 {
  193 }
  194 
  195 /* Temporary helper */
  196 void
  197 cpu_throw(struct thread *old, struct thread *new)
  198 {
  199 
  200         cpu_switch(old, new);
  201         panic("cpu_throw() didn't");
  202 }
  203 
  204 /*
  205  * Reset back to firmware.
  206  */
  207 void
  208 cpu_reset()
  209 {
  210         OF_exit();
  211 }
  212 
  213 /*
  214  * Allocate an sf_buf for the given vm_page.  On this machine, however, there
  215  * is no sf_buf object.  Instead, an opaque pointer to the given vm_page is
  216  * returned.
  217  */
  218 struct sf_buf *
  219 sf_buf_alloc(struct vm_page *m, int pri)
  220 {
  221 
  222         return ((struct sf_buf *)m);
  223 }
  224 
  225 /*
  226  * Free the sf_buf.  In fact, do nothing because there are no resources
  227  * associated with the sf_buf.
  228  */
  229 void
  230 sf_buf_free(struct sf_buf *sf)
  231 {
  232 }
  233 
  234 /*
  235  * Software interrupt handler for queued VM system processing.
  236  */
  237 void
  238 swi_vm(void *dummy)
  239 {
  240 #if 0 /* XXX: Don't have busdma stuff yet */
  241         if (busdma_swi_pending != 0)
  242                 busdma_swi();
  243 #endif
  244 }
  245 
  246 /*
  247  * Tell whether this address is in some physical memory region.
  248  * Currently used by the kernel coredump code in order to avoid
  249  * dumping the ``ISA memory hole'' which could cause indefinite hangs,
  250  * or other unpredictable behaviour.
  251  */
  252 
  253 
  254 int
  255 is_physical_memory(addr)
  256         vm_offset_t addr;
  257 {
  258         /*
  259          * stuff other tests for known memory-mapped devices (PCI?)
  260          * here
  261          */
  262 
  263         return 1;
  264 }
  265 
  266 /*
  267  * KSE functions
  268  */
  269 void
  270 cpu_thread_exit(struct thread *td)
  271 {
  272 }
  273 
  274 void
  275 cpu_thread_clean(struct thread *td)
  276 {
  277 }
  278 
  279 void
  280 cpu_thread_setup(struct thread *td)
  281 {
  282         struct pcb *pcb;
  283 
  284         pcb = (struct pcb *)((td->td_kstack + td->td_kstack_pages * PAGE_SIZE -
  285             sizeof(struct pcb)) & ~0x2fU);
  286         td->td_pcb = pcb;
  287         td->td_frame = (struct trapframe *)pcb - 1;
  288 }
  289 
  290 void
  291 cpu_thread_swapin(struct thread *td)
  292 {
  293 }
  294 
  295 void
  296 cpu_thread_swapout(struct thread *td)
  297 {
  298 }
  299 
  300 void
  301 cpu_set_upcall(struct thread *td, struct thread *td0)
  302 {
  303         struct pcb *pcb2;
  304         struct trapframe *tf;
  305         struct callframe *cf;
  306 
  307         pcb2 = td->td_pcb;
  308 
  309         /* Copy the upcall pcb */
  310         bcopy(td0->td_pcb, pcb2, sizeof(*pcb2));
  311 
  312         /* Create a stack for the new thread */
  313         tf = td->td_frame;
  314         bcopy(td0->td_frame, tf, sizeof(struct trapframe));
  315         tf->fixreg[FIRSTARG] = 0;
  316         tf->fixreg[FIRSTARG + 1] = 0;
  317         tf->cr &= ~0x10000000;
  318 
  319         /* Set registers for trampoline to user mode. */
  320         cf = (struct callframe *)tf - 1;
  321         memset(cf, 0, sizeof(struct callframe));
  322         cf->cf_func = (register_t)fork_return;
  323         cf->cf_arg0 = (register_t)td;
  324         cf->cf_arg1 = (register_t)tf;
  325 
  326         pcb2->pcb_sp = (register_t)cf;
  327         pcb2->pcb_lr = (register_t)fork_trampoline;
  328         pcb2->pcb_usr = kernel_pmap->pm_sr[USER_SR];
  329 
  330         /* Setup to release sched_lock in fork_exit(). */
  331         td->td_md.md_spinlock_count = 1;
  332         td->td_md.md_saved_msr = PSL_KERNSET;
  333 }
  334 
  335 void
  336 cpu_set_upcall_kse(struct thread *td, void (*entry)(void *), void *arg,
  337         stack_t *stack)
  338 {
  339         struct trapframe *tf;
  340         uint32_t sp;
  341 
  342         tf = td->td_frame;
  343         /* align stack and alloc space for frame ptr and saved LR */
  344         sp = ((uint32_t)stack->ss_sp + stack->ss_size
  345                 - 2*sizeof(u_int32_t)) & ~0x1f;
  346         bzero(tf, sizeof(struct trapframe));
  347 
  348         tf->fixreg[1] = (register_t)sp;
  349         tf->fixreg[3] = (register_t)arg;
  350         tf->srr0 = (register_t)entry;
  351         tf->srr1 = PSL_MBO | PSL_USERSET | PSL_FE_DFLT;
  352         td->td_pcb->pcb_flags = 0;
  353 
  354         td->td_retval[0] = (register_t)entry;
  355         td->td_retval[1] = 0;
  356 }
  357 
  358 int
  359 cpu_set_user_tls(struct thread *td, void *tls_base)
  360 {
  361 
  362         td->td_frame->fixreg[2] = (register_t)tls_base;
  363         return (0);
  364 }

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