359 lines
9.1 KiB
C
359 lines
9.1 KiB
C
/*-
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* Copyright (c) 1982, 1986 The Regents of the University of California.
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* Copyright (c) 1989, 1990 William Jolitz
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* Copyright (c) 1994 John Dyson
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* the Systems Programming Group of the University of Utah Computer
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* Science Department, and William Jolitz.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)vm_machdep.c 7.3 (Berkeley) 5/13/91
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* Utah $Hdr: vm_machdep.c 1.16.1.1 89/06/23$
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* $FreeBSD$
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*/
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/*
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* Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Author: Chris G. Demetriou
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/malloc.h>
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#include <sys/bio.h>
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#include <sys/buf.h>
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#include <sys/ktr.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/vnode.h>
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#include <sys/vmmeter.h>
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#include <sys/kernel.h>
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#include <sys/sysctl.h>
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#include <sys/unistd.h>
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#include <machine/clock.h>
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#include <machine/cpu.h>
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#include <machine/fpu.h>
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#include <machine/md_var.h>
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#include <dev/ofw/openfirm.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <vm/vm_kern.h>
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#include <vm/vm_page.h>
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#include <vm/vm_map.h>
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#include <vm/vm_extern.h>
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#include <sys/user.h>
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/*
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* quick version of vm_fault
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*/
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int
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vm_fault_quick(v, prot)
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caddr_t v;
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int prot;
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{
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int r;
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if (prot & VM_PROT_WRITE)
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r = subyte(v, fubyte(v));
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else
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r = fubyte(v);
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return(r);
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}
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/*
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* Finish a fork operation, with process p2 nearly set up.
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* Copy and update the pcb, set up the stack so that the child
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* ready to run and return to user mode.
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*/
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void
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cpu_fork(struct thread *td1, struct proc *p2, struct thread *td2, int flags)
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{
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struct proc *p1;
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struct trapframe *tf;
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struct callframe *cf;
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struct switchframe *sf;
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struct pcb *pcb;
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KASSERT(td1 == curthread || td1 == &thread0,
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("cpu_fork: p1 not curproc and not proc0"));
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CTR3(KTR_PROC, "cpu_fork: called td1=%08x p2=%08x flags=%x", (u_int)td1, (u_int)p2, flags);
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if ((flags & RFPROC) == 0)
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return;
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p1 = td1->td_proc;
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pcb = (struct pcb *)((td2->td_kstack + KSTACK_PAGES * PAGE_SIZE -
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sizeof(struct pcb)) & ~0x2fU);
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td2->td_pcb = pcb;
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/* Copy the pcb */
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bcopy(td1->td_pcb, pcb, sizeof(struct pcb));
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/*
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* Create a fresh stack for the new process.
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* Copy the trap frame for the return to user mode as if from a
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* syscall. This copies most of the user mode register values.
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*/
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tf = (struct trapframe *)pcb - 1;
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bcopy(td1->td_frame, tf, sizeof(*tf));
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/* XXX: Set up trap frame? */
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td2->td_frame = tf;
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cf = (struct callframe *)tf - 1;
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cf->cf_func = (register_t)fork_return;
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cf->cf_arg0 = (register_t)td2;
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cf->cf_arg1 = (register_t)tf;
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pcb->pcb_sp = (register_t)cf;
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pcb->pcb_lr = (register_t)fork_trampoline;
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/*
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* Now cpu_switch() can schedule the new process.
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*/
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}
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/*
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* Intercept the return address from a freshly forked process that has NOT
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* been scheduled yet.
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*
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* This is needed to make kernel threads stay in kernel mode.
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*/
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void
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cpu_set_fork_handler(td, func, arg)
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struct thread *td;
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void (*func) __P((void *));
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void *arg;
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{
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struct callframe *cf;
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CTR3(KTR_PROC, "cpu_set_fork_handler: called with td=%08x func=%08x arg=%08x",
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(u_int)td, (u_int)func, (u_int)arg);
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cf = (struct callframe *)td->td_pcb->pcb_sp;
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cf->cf_func = (register_t)func;
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cf->cf_arg0 = (register_t)arg;
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}
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/*
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* cpu_exit is called as the last action during exit.
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* We release the address space of the process, block interrupts,
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* and call switch_exit. switch_exit switches to proc0's PCB and stack,
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* then jumps into the middle of cpu_switch, as if it were switching
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* from proc0.
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*/
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void
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cpu_exit(td)
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register struct thread *td;
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{
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}
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void
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cpu_wait(td)
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struct proc *td;
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{
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}
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/* Temporary helper */
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void
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cpu_throw(void)
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{
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cpu_switch();
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panic("cpu_throw() didn't");
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}
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/*
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* Dump the machine specific header information at the start of a core dump.
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*/
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int
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cpu_coredump(td, vp, cred)
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struct thread *td;
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struct vnode *vp;
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struct ucred *cred;
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{
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return (vn_rdwr(UIO_WRITE, vp, (caddr_t)td->td_proc->p_uarea,
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ctob(UAREA_PAGES), (off_t)0, UIO_SYSSPACE, IO_UNIT, cred,
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(int *)NULL, td));
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}
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/*
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* Map an IO request into kernel virtual address space.
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*
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* All requests are (re)mapped into kernel VA space.
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* Notice that we use b_bufsize for the size of the buffer
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* to be mapped. b_bcount might be modified by the driver.
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*/
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void
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vmapbuf(bp)
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register struct buf *bp;
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{
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register caddr_t addr, v, kva;
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vm_offset_t pa;
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GIANT_REQUIRED;
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if ((bp->b_flags & B_PHYS) == 0)
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panic("vmapbuf");
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for (v = bp->b_saveaddr, addr = (caddr_t)trunc_page(bp->b_data);
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addr < bp->b_data + bp->b_bufsize;
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addr += PAGE_SIZE, v += PAGE_SIZE) {
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/*
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* Do the vm_fault if needed; do the copy-on-write thing
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* when reading stuff off device into memory.
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*/
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vm_fault_quick((addr >= bp->b_data) ? addr : bp->b_data,
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(bp->b_iocmd == BIO_READ)?(VM_PROT_READ|VM_PROT_WRITE):VM_PROT_READ);
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pa = trunc_page(pmap_kextract((vm_offset_t) addr));
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if (pa == 0)
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panic("vmapbuf: page not present");
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vm_page_hold(PHYS_TO_VM_PAGE(pa));
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pmap_kenter((vm_offset_t) v, pa);
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}
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kva = bp->b_saveaddr;
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bp->b_saveaddr = bp->b_data;
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bp->b_data = kva + (((vm_offset_t) bp->b_data) & PAGE_MASK);
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}
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/*
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* Free the io map PTEs associated with this IO operation.
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* We also invalidate the TLB entries and restore the original b_addr.
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*/
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void
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vunmapbuf(bp)
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register struct buf *bp;
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{
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register caddr_t addr;
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vm_offset_t pa;
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GIANT_REQUIRED;
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if ((bp->b_flags & B_PHYS) == 0)
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panic("vunmapbuf");
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for (addr = (caddr_t)trunc_page(bp->b_data);
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addr < bp->b_data + bp->b_bufsize;
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addr += PAGE_SIZE) {
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pa = trunc_page(pmap_kextract((vm_offset_t) addr));
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pmap_kremove((vm_offset_t) addr);
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vm_page_unhold(PHYS_TO_VM_PAGE(pa));
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}
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bp->b_data = bp->b_saveaddr;
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}
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/*
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* Reset back to firmware.
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*/
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void
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cpu_reset()
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{
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OF_exit();
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}
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int
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grow_stack(p, sp)
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struct proc *p;
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size_t sp;
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{
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int rv;
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rv = vm_map_growstack (p, sp);
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if (rv != KERN_SUCCESS)
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return (0);
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return (1);
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}
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/*
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* Software interrupt handler for queued VM system processing.
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*/
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void
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swi_vm(void *dummy)
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{
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#if 0 /* XXX: Don't have busdma stuff yet */
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if (busdma_swi_pending != 0)
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busdma_swi();
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#endif
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}
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/*
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* Tell whether this address is in some physical memory region.
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* Currently used by the kernel coredump code in order to avoid
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* dumping the ``ISA memory hole'' which could cause indefinite hangs,
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* or other unpredictable behaviour.
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*/
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int
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is_physical_memory(addr)
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vm_offset_t addr;
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{
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/*
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* stuff other tests for known memory-mapped devices (PCI?)
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* here
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*/
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return 1;
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}
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