405 lines
11 KiB
C
405 lines
11 KiB
C
/* $NetBSD: vm_machdep.c,v 1.26 1998/01/06 07:49:44 thorpej Exp $ */
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/*
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* Copyright (c) 1988 University of Utah.
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* Copyright (c) 1982, 1986, 1990, 1993
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* The Regents of the University of California. 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.
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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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/*
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* from: Utah $Hdr: vm_machdep.c 1.21 91/04/06$
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*
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* @(#)vm_machdep.c 8.6 (Berkeley) 1/12/94
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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/buf.h>
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#include <sys/user.h>
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#include <sys/vnode.h>
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#include <sys/core.h>
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#include <sys/exec.h>
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#include <vm/vm.h>
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#include <vm/vm_kern.h>
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#include <vm/vm_map.h>
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#include <machine/cpu.h>
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#include <machine/pmap.h>
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#include <machine/pte.h>
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#include <machine/reg.h>
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void savectx __P((struct pcb *));
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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 kernel stack and pcb, making the child
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* ready to run, and marking it so that it can return differently
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* than the parent. Returns 1 in the child process, 0 in the parent.
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* We currently double-map the user area so that the stack is at the same
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* address in each process; in the future we will probably relocate
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* the frame pointers on the stack after copying.
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*/
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void
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cpu_fork(p1, p2)
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register struct proc *p1, *p2;
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{
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void child_return __P((struct proc *, struct frame)); /* XXX */
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register struct pcb *pcb = &p2->p_addr->u_pcb;
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register struct trapframe *tf;
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register struct switchframe *sf;
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extern struct pcb *curpcb;
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p2->p_md.md_flags = p1->p_md.md_flags;
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/* Sync curpcb (which is presumably p1's PCB) and copy it to p2. */
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savectx(curpcb);
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*pcb = p1->p_addr->u_pcb;
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/*
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* Copy the trap frame and arrange for the child to return directly
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* through return_to_user().
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*/
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tf = (struct trapframe *)((u_int)p2->p_addr + USPACE) -1;
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p2->p_md.md_regs = (int *)tf;
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*tf = *(struct trapframe *)p1->p_md.md_regs;
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sf = (struct switchframe *)tf - 1;
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sf->sf_pc = (u_int)proc_trampoline;
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pcb->pcb_regs[6] = (int)child_return; /* A2 */
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pcb->pcb_regs[7] = (int)p2; /* A3 */
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pcb->pcb_regs[11] = (int)sf; /* SSP */
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}
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/*
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* cpu_set_kpc
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* Arrange for in-kernel execution of a process to continue at the
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* named PC as if the code at that address had been called as a function
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* with one argument--the named process's process pointer.
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*
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* Note that it's assumed that whne the named process returns, rei()
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* should be invoked to return to user mode.
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*/
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void
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cpu_set_kpc(p, pc)
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struct proc *p;
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void (*pc) __P((struct proc *));
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{
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struct pcb *pcbp;
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struct switchframe *sf;
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pcbp = &p->p_addr->u_pcb;
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sf = (struct switchframe *) pcbp->pcb_regs[11];
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sf->sf_pc = (u_int) proc_trampoline;
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pcbp->pcb_regs[6] = (int)pc; /* A2 */
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pcbp->pcb_regs[7] = (int)p; /* A3 */
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}
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void switch_exit __P((struct proc *));
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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 and machine-dependent resources,
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* block context switches and then call switch_exit() which will
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* free our stack and user area and switch to another process.
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* Thus, we never return.
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*/
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volatile void
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cpu_exit(p)
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struct proc *p;
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{
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vmspace_free(p->p_vmspace);
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(void) splhigh();
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cnt.v_swtch++;
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switch_exit(p);
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for(;;); /* Get rid of a compile warning */
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/* NOTREACHED */
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}
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/*
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* Dump the machine specific segment at the start of a core dump.
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* This means the CPU and FPU registers. The format used here is
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* the same one ptrace uses, so gdb can be machine independent.
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*
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* XXX - Generate Sun format core dumps for Sun executables?
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*/
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struct md_core {
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struct reg intreg;
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struct fpreg freg;
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};
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int
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cpu_coredump(p, vp, cred, chdr)
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struct proc *p;
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struct vnode *vp;
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struct ucred *cred;
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struct core *chdr;
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{
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int error;
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struct md_core md_core;
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struct coreseg cseg;
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register struct user *up = p->p_addr;
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register i;
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CORE_SETMAGIC(*chdr, COREMAGIC, MID_M68K, 0);
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chdr->c_hdrsize = ALIGN(sizeof(*chdr));
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chdr->c_seghdrsize = ALIGN(sizeof(cseg));
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chdr->c_cpusize = sizeof(md_core);
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/* Save integer registers. */
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{
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register struct frame *f;
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f = (struct frame*) p->p_md.md_regs;
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for (i = 0; i < 16; i++) {
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md_core.intreg.r_regs[i] = f->f_regs[i];
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}
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md_core.intreg.r_sr = f->f_sr;
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md_core.intreg.r_pc = f->f_pc;
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}
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if (fputype) {
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register struct fpframe *f;
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f = &up->u_pcb.pcb_fpregs;
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m68881_save(f);
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for (i = 0; i < (8*3); i++) {
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md_core.freg.r_regs[i] = f->fpf_regs[i];
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}
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md_core.freg.r_fpcr = f->fpf_fpcr;
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md_core.freg.r_fpsr = f->fpf_fpsr;
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md_core.freg.r_fpiar = f->fpf_fpiar;
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} else {
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bzero((caddr_t)&md_core.freg, sizeof(md_core.freg));
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}
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CORE_SETMAGIC(cseg, CORESEGMAGIC, MID_M68K, CORE_CPU);
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cseg.c_addr = 0;
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cseg.c_size = chdr->c_cpusize;
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error = vn_rdwr(UIO_WRITE, vp, (caddr_t)&cseg, chdr->c_seghdrsize,
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(off_t)chdr->c_hdrsize, UIO_SYSSPACE,
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IO_NODELOCKED|IO_UNIT, cred, (int *)NULL, p);
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if (error)
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return error;
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error = vn_rdwr(UIO_WRITE, vp, (caddr_t)&md_core, sizeof(md_core),
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(off_t)(chdr->c_hdrsize + chdr->c_seghdrsize), UIO_SYSSPACE,
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IO_NODELOCKED|IO_UNIT, cred, (int *)NULL, p);
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if (!error)
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chdr->c_nseg++;
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return error;
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}
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/*
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* Move pages from one kernel virtual address to another.
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* Both addresses are assumed to reside in the Sysmap,
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* and size must be a multiple of CLSIZE.
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*/
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void
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pagemove(from, to, size)
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register caddr_t from, to;
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size_t size;
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{
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register vm_offset_t pa;
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#ifdef DEBUG
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if (size % PAGE_SIZE)
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panic("pagemove");
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#endif
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while (size > 0) {
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pa = pmap_extract(pmap_kernel(), (vm_offset_t) from);
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#ifdef DEBUG
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if (pa == 0)
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panic("pagemove 2");
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if (pmap_extract(pmap_kernel(), (vm_offset_t) to) != 0)
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panic("pagemove 3");
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#endif
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pmap_remove(pmap_kernel(),
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(vm_offset_t)from, (vm_offset_t) from + PAGE_SIZE);
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pmap_enter(pmap_kernel(),
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(vm_offset_t)to, pa, VM_PROT_READ|VM_PROT_WRITE, 1);
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from += PAGE_SIZE;
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to += PAGE_SIZE;
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size -= PAGE_SIZE;
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}
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}
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/*
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* Map `size' bytes of physical memory starting at `paddr' into
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* kernel VA space at `vaddr'. Read/write and cache-inhibit status
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* are specified by `prot'.
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*/
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void
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physaccess(vaddr, paddr, size, prot)
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caddr_t vaddr, paddr;
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register int size, prot;
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{
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register pt_entry_t *pte;
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register u_int page;
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pte = kvtopte(vaddr);
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page = (u_int)paddr & PG_FRAME;
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for (size = btoc(size); size; size--) {
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*pte++ = PG_V | prot | page;
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page += NBPG;
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}
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TBIAS();
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}
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void
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physunaccess(vaddr, size)
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caddr_t vaddr;
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register int size;
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{
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register pt_entry_t *pte;
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pte = kvtopte(vaddr);
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for (size = btoc(size); size; size--)
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*pte++ = PG_NV;
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TBIAS();
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}
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void setredzone __P((void *, caddr_t));
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/*
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* Set a red zone in the kernel stack after the u. area.
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* We don't support a redzone right now. It really isn't clear
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* that it is a good idea since, if the kernel stack were to roll
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* into a write protected page, the processor would lock up (since
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* it cannot create an exception frame) and we would get no useful
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* post-mortem info. Currently, under the DEBUG option, we just
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* check at every clock interrupt to see if the current k-stack has
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* gone too far (i.e. into the "redzone" page) and if so, panic.
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* Look at _lev6intr in locore.s for more details.
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*/
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/*ARGSUSED*/
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void
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setredzone(pte, vaddr)
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void *pte;
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caddr_t vaddr;
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{
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}
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int kvtop __P((register caddr_t addr));
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/*
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* Convert kernel VA to physical address
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*/
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int
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kvtop(addr)
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register caddr_t addr;
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{
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vm_offset_t va;
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va = pmap_extract(pmap_kernel(), (vm_offset_t)addr);
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if (va == 0)
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panic("kvtop: zero page frame");
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return((int)va);
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}
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extern vm_map_t phys_map;
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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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* XXX we allocate KVA space by using kmem_alloc_wait which we know
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* allocates space without backing physical memory. This implementation
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* is a total crock, the multiple mappings of these physical pages should
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* be reflected in the higher-level VM structures to avoid problems.
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*/
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void
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vmapbuf(bp, len)
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struct buf *bp;
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vm_size_t len;
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{
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struct pmap *upmap, *kpmap;
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vm_offset_t uva; /* User VA (map from) */
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vm_offset_t kva; /* Kernel VA (new to) */
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vm_offset_t pa; /* physical address */
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vm_size_t off;
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if ((bp->b_flags & B_PHYS) == 0)
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panic("vmapbuf");
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uva = m68k_trunc_page(bp->b_saveaddr = bp->b_data);
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off = (vm_offset_t)bp->b_data - uva;
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len = m68k_round_page(off + len);
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kva = kmem_alloc_wait(phys_map, len);
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bp->b_data = (caddr_t)(kva + off);
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upmap = vm_map_pmap(&bp->b_proc->p_vmspace->vm_map);
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kpmap = vm_map_pmap(phys_map);
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do {
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pa = pmap_extract(upmap, uva);
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if (pa == 0)
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panic("vmapbuf: null page frame");
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pmap_enter(kpmap, kva, pa, VM_PROT_READ|VM_PROT_WRITE, TRUE);
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uva += PAGE_SIZE;
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kva += PAGE_SIZE;
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len -= PAGE_SIZE;
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} while (len);
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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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*/
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void
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vunmapbuf(bp, len)
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struct buf *bp;
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vm_size_t len;
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{
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vm_offset_t kva;
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vm_size_t off;
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if ((bp->b_flags & B_PHYS) == 0)
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panic("vunmapbuf");
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kva = m68k_trunc_page(bp->b_data);
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off = (vm_offset_t)bp->b_data - kva;
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len = m68k_round_page(off + len);
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/*
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* pmap_remove() is unnecessary here, as kmem_free_wakeup()
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* will do it for us.
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*/
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kmem_free_wakeup(phys_map, kva, len);
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bp->b_data = bp->b_saveaddr;
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bp->b_saveaddr = 0;
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}
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