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

     /*-
      * 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: releng/5.0/sys/powerpc/powerpc/vm_machdep.c 107719 2002-12-10 02:33:45Z julian $
     */
    /*
     * 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/sysctl.h>
    #include <sys/unistd.h>
    
    #include <machine/clock.h>
    #include <machine/cpu.h>
    #include <machine/fpu.h>
    #include <machine/frame.h>
    #include <machine/md_var.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>
    
   #include <sys/user.h>
   
   /*
    * quick version of vm_fault
    */
   int
   vm_fault_quick(v, prot)
           caddr_t v;
           int prot;
   {
           int r;
           if (prot & VM_PROT_WRITE)
                   r = subyte(v, fubyte(v));
           else
                   r = fubyte(v);
           return(r);
   }
   
   /*
    * 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  proc *p1;
           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=%08x p2=%08x flags=%x", (u_int)td1, (u_int)p2, flags);
   
           if ((flags & RFPROC) == 0)
                   return;
   
           p1 = td1->td_proc;
   
           pcb = (struct pcb *)((td2->td_kstack + KSTACK_PAGES * PAGE_SIZE -
               sizeof(struct pcb)) & ~0x2fU);
           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;
           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;
           pcb->pcb_lr = (register_t)fork_trampoline;
           pcb->pcb_usr = kernel_pmap->pm_sr[USER_SR];
   
           /*
            * 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_set_fork_handler(td, func, arg)
           struct thread *td;
           void (*func)(void *);
           void *arg;
   {
           struct  callframe *cf;
   
           CTR3(KTR_PROC, "cpu_set_fork_handler: called with td=%08x func=%08x arg=%08x",
               (u_int)td, (u_int)func, (u_int)arg);
   
           cf = (struct callframe *)td->td_pcb->pcb_sp;
   
           cf->cf_func = (register_t)func;
           cf->cf_arg0 = (register_t)arg;
   }
   
   /*
    * cpu_exit is called as the last action during exit.
    * We release the address space of the process, block interrupts,
    * and call switch_exit.  switch_exit switches to proc0's PCB and stack,
    * then jumps into the middle of cpu_switch, as if it were switching
    * from proc0.
    */
   void
   cpu_exit(td)
           register struct thread *td;
   {
   }
   
   void
   cpu_sched_exit(td)
           register struct thread *td;
   {
   }
   
   void
   cpu_wait(td)
           struct proc *td;
   {
   }
   
   /* Temporary helper */
   void
   cpu_throw(void)
   {
   
           cpu_switch();
           panic("cpu_throw() didn't");
   }
   
   /*
    * Map an IO request into kernel virtual address space.
    *
    * All requests are (re)mapped into kernel VA space.
    * Notice that we use b_bufsize for the size of the buffer
    * to be mapped.  b_bcount might be modified by the driver.
    */
   void
   vmapbuf(struct buf *bp)
   {
           caddr_t addr, kva;
           vm_offset_t pa;
           int pidx;
           struct vm_page *m;
           pmap_t pmap;
   
           GIANT_REQUIRED;
   
           if ((bp->b_flags & B_PHYS) == 0)
                   panic("vmapbuf");
   
           pmap = &curproc->p_vmspace->vm_pmap;
           for (addr = (caddr_t)trunc_page(bp->b_data), pidx = 0;
               addr < bp->b_data + bp->b_bufsize;
               addr += PAGE_SIZE, pidx++) {
                   /*
                    * Do the vm_fault if needed; do the copy-on-write thing
                    * when reading stuff off device into memory.
                    */
                   vm_fault_quick((addr >= bp->b_data) ? addr : bp->b_data,
                           (bp->b_iocmd == BIO_READ)?(VM_PROT_READ|VM_PROT_WRITE):VM_PROT_READ);
                   pa = trunc_page(pmap_extract(pmap, (vm_offset_t) addr));
                   if (pa == 0)
                           panic("vmapbuf: page not present");
                   m = PHYS_TO_VM_PAGE(pa);
                   vm_page_hold(m);
                   bp->b_pages[pidx] = m;
           }
           if (pidx > btoc(MAXPHYS))
                   panic("vmapbuf: mapped more than MAXPHYS");
           pmap_qenter((vm_offset_t)bp->b_saveaddr, bp->b_pages, pidx);
   
           kva = bp->b_saveaddr;
           bp->b_npages = pidx;
           bp->b_saveaddr = bp->b_data;
           bp->b_data = kva + (((vm_offset_t) bp->b_data) & PAGE_MASK);
   }
   
   /*
    * Free the io map PTEs associated with this IO operation.
    * We also invalidate the TLB entries and restore the original b_addr.
    */
   void
   vunmapbuf(struct buf *bp)
   {
           int pidx;
           int npages;
   
           GIANT_REQUIRED;
   
           if ((bp->b_flags & B_PHYS) == 0)
                   panic("vunmapbuf");
   
           npages = bp->b_npages;
           pmap_qremove(trunc_page((vm_offset_t)bp->b_data),
               npages);
           for (pidx = 0; pidx < npages; pidx++)
                   vm_page_unhold(bp->b_pages[pidx]);
   
           bp->b_data = bp->b_saveaddr;
   }
   
   /*
    * Reset back to firmware.
    */
   void
   cpu_reset()
   {
           OF_exit();
   }
   
   /*
    * Software interrupt handler for queued VM system processing.
    */   
   void  
   swi_vm(void *dummy) 
   {     
   #if 0 /* XXX: Don't have busdma stuff yet */
           if (busdma_swi_pending != 0)
                   busdma_swi();
   #endif
   }
   
   /*
    * Tell whether this address is in some physical memory region.
    * Currently used by the kernel coredump code in order to avoid
    * dumping the ``ISA memory hole'' which could cause indefinite hangs,
    * or other unpredictable behaviour.
    */
   
   
   int
   is_physical_memory(addr)
           vm_offset_t addr;
   {
           /*
            * stuff other tests for known memory-mapped devices (PCI?)
            * here
            */
   
           return 1;
   }
   
   /*
    * KSE functions
    */
   void
   cpu_thread_exit(struct thread *td)     
   {
   
           return;
   }
   
   void
   cpu_thread_clean(struct thread *td)     
   {
   }
   
   void
   cpu_thread_setup(struct thread *td)
   {
   
           return;
   }
   
   void
   cpu_set_upcall(struct thread *td, void *pcb)
   {
   
           return;
   }
   
   void
   cpu_set_upcall_kse(struct thread *td, struct kse *ke)
   {
   
           return;
   }

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