f4ef9cec40
the last action of kern_exit(). Instead, it is a MD callout to cleanup per-process state during exit. - Add notes of concern to Alpha and ia64 about the possible need to drop fp state in cpu_thread_exit() rather than in cpu_exit() since it is per-thread state rather than per-process.
348 lines
8.9 KiB
C
348 lines
8.9 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/mbuf.h>
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#include <sys/sf_buf.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/frame.h>
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#include <machine/md_var.h>
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#include <machine/pcb.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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/*
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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 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 +
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td2->td_kstack_pages * PAGE_SIZE - 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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/* Set up trap frame. */
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tf->fixreg[FIRSTARG] = 0;
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tf->fixreg[FIRSTARG + 1] = 0;
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tf->cr &= ~0x10000000;
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td2->td_frame = tf;
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cf = (struct callframe *)tf - 1;
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memset(cf, 0, sizeof(struct callframe));
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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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pcb->pcb_usr = kernel_pmap->pm_sr[USER_SR];
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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)(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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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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/* Temporary helper */
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void
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cpu_throw(struct thread *old, struct thread *new)
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{
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cpu_switch(old, new);
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panic("cpu_throw() didn't");
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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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/*
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* Allocate an sf_buf for the given vm_page. On this machine, however, there
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* is no sf_buf object. Instead, an opaque pointer to the given vm_page is
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* returned.
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*/
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struct sf_buf *
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sf_buf_alloc(struct vm_page *m, int pri)
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{
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return ((struct sf_buf *)m);
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}
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/*
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* Free the sf_buf. In fact, do nothing because there are no resources
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* associated with the sf_buf.
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*/
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void
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sf_buf_free(struct sf_buf *sf)
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{
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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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/*
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* KSE functions
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*/
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void
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cpu_thread_exit(struct thread *td)
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{
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}
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void
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cpu_thread_clean(struct thread *td)
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{
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}
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void
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cpu_thread_setup(struct thread *td)
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{
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struct pcb *pcb;
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pcb = (struct pcb *)((td->td_kstack + td->td_kstack_pages * PAGE_SIZE -
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sizeof(struct pcb)) & ~0x2fU);
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td->td_pcb = pcb;
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td->td_frame = (struct trapframe *)pcb - 1;
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}
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void
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cpu_thread_swapin(struct thread *td)
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{
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}
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void
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cpu_thread_swapout(struct thread *td)
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{
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}
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void
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cpu_set_upcall(struct thread *td, struct thread *td0)
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{
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struct pcb *pcb2;
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struct trapframe *tf;
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struct callframe *cf;
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pcb2 = td->td_pcb;
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/* Copy the upcall pcb */
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bcopy(td0->td_pcb, pcb2, sizeof(*pcb2));
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/* Create a stack for the new thread */
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tf = td->td_frame;
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bcopy(td0->td_frame, tf, sizeof(struct trapframe));
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tf->fixreg[FIRSTARG] = 0;
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tf->fixreg[FIRSTARG + 1] = 0;
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tf->cr &= ~0x10000000;
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/* Set registers for trampoline to user mode. */
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cf = (struct callframe *)tf - 1;
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memset(cf, 0, sizeof(struct callframe));
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cf->cf_func = (register_t)fork_return;
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cf->cf_arg0 = (register_t)td;
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cf->cf_arg1 = (register_t)tf;
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pcb2->pcb_sp = (register_t)cf;
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pcb2->pcb_lr = (register_t)fork_trampoline;
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pcb2->pcb_usr = kernel_pmap->pm_sr[USER_SR];
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}
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void
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cpu_set_upcall_kse(struct thread *td, struct kse_upcall *ku)
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{
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struct trapframe *tf;
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uint32_t sp;
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tf = td->td_frame;
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/* align stack and alloc space for frame ptr and saved LR */
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sp = ((uint32_t)ku->ku_stack.ss_sp + ku->ku_stack.ss_size
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- 2*sizeof(u_int32_t)) & ~0x1f;
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bzero(tf, sizeof(struct trapframe));
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tf->fixreg[1] = (register_t)sp;
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tf->fixreg[3] = (register_t)ku->ku_mailbox;
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tf->srr0 = (register_t)ku->ku_func;
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tf->srr1 = PSL_MBO | PSL_USERSET | PSL_FE_DFLT;
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td->td_pcb->pcb_flags = 0;
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td->td_retval[0] = (register_t)ku->ku_func;
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td->td_retval[1] = 0;
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}
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