vm_machdep.c revision 92842
136865Sdfr/*- 236865Sdfr * Copyright (c) 1982, 1986 The Regents of the University of California. 336865Sdfr * Copyright (c) 1989, 1990 William Jolitz 436865Sdfr * Copyright (c) 1994 John Dyson 536865Sdfr * All rights reserved. 636865Sdfr * 736865Sdfr * This code is derived from software contributed to Berkeley by 836865Sdfr * the Systems Programming Group of the University of Utah Computer 936865Sdfr * Science Department, and William Jolitz. 1036865Sdfr * 1136865Sdfr * Redistribution and use in source and binary forms, with or without 1236865Sdfr * modification, are permitted provided that the following conditions 1336865Sdfr * are met: 1436865Sdfr * 1. Redistributions of source code must retain the above copyright 1536865Sdfr * notice, this list of conditions and the following disclaimer. 1636865Sdfr * 2. Redistributions in binary form must reproduce the above copyright 1736865Sdfr * notice, this list of conditions and the following disclaimer in the 1836865Sdfr * documentation and/or other materials provided with the distribution. 1936865Sdfr * 3. All advertising materials mentioning features or use of this software 2036865Sdfr * must display the following acknowledgement: 2136865Sdfr * This product includes software developed by the University of 2236865Sdfr * California, Berkeley and its contributors. 2336865Sdfr * 4. Neither the name of the University nor the names of its contributors 2436865Sdfr * may be used to endorse or promote products derived from this software 2536865Sdfr * without specific prior written permission. 2636865Sdfr * 2736865Sdfr * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 2836865Sdfr * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2936865Sdfr * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 3036865Sdfr * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 3136865Sdfr * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 3236865Sdfr * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 3336865Sdfr * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 3436865Sdfr * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 3536865Sdfr * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3636865Sdfr * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3736865Sdfr * SUCH DAMAGE. 3836865Sdfr * 3936865Sdfr * from: @(#)vm_machdep.c 7.3 (Berkeley) 5/13/91 4036865Sdfr * Utah $Hdr: vm_machdep.c 1.16.1.1 89/06/23$ 4150477Speter * $FreeBSD: head/sys/powerpc/aim/vm_machdep.c 92842 2002-03-20 23:17:50Z alfred $ 4236865Sdfr */ 4336865Sdfr/* 4436865Sdfr * Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University. 4536865Sdfr * All rights reserved. 4636865Sdfr * 4736865Sdfr * Author: Chris G. Demetriou 4836865Sdfr * 4936865Sdfr * Permission to use, copy, modify and distribute this software and 5036865Sdfr * its documentation is hereby granted, provided that both the copyright 5136865Sdfr * notice and this permission notice appear in all copies of the 5236865Sdfr * software, derivative works or modified versions, and any portions 5336865Sdfr * thereof, and that both notices appear in supporting documentation. 5436865Sdfr * 5536865Sdfr * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 5636865Sdfr * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 5736865Sdfr * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 5836865Sdfr * 5936865Sdfr * Carnegie Mellon requests users of this software to return to 6036865Sdfr * 6136865Sdfr * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 6236865Sdfr * School of Computer Science 6336865Sdfr * Carnegie Mellon University 6436865Sdfr * Pittsburgh PA 15213-3890 6536865Sdfr * 6636865Sdfr * any improvements or extensions that they make and grant Carnegie the 6736865Sdfr * rights to redistribute these changes. 6836865Sdfr */ 6936865Sdfr 7036865Sdfr#include <sys/param.h> 7136865Sdfr#include <sys/systm.h> 7236865Sdfr#include <sys/proc.h> 7336865Sdfr#include <sys/malloc.h> 7460041Sphk#include <sys/bio.h> 7536865Sdfr#include <sys/buf.h> 7685201Smp#include <sys/ktr.h> 7785201Smp#include <sys/lock.h> 7867365Sjhb#include <sys/mutex.h> 7936865Sdfr#include <sys/vnode.h> 8036865Sdfr#include <sys/vmmeter.h> 8136865Sdfr#include <sys/kernel.h> 8236865Sdfr#include <sys/sysctl.h> 8354207Speter#include <sys/unistd.h> 8436865Sdfr 8536865Sdfr#include <machine/clock.h> 8636865Sdfr#include <machine/cpu.h> 8741499Sdfr#include <machine/fpu.h> 8836865Sdfr#include <machine/md_var.h> 8936865Sdfr 9078342Sbenno#include <dev/ofw/openfirm.h> 9178342Sbenno 9236865Sdfr#include <vm/vm.h> 9336865Sdfr#include <vm/vm_param.h> 9436865Sdfr#include <vm/vm_kern.h> 9536865Sdfr#include <vm/vm_page.h> 9636865Sdfr#include <vm/vm_map.h> 9736865Sdfr#include <vm/vm_extern.h> 9836865Sdfr 9936865Sdfr#include <sys/user.h> 10036865Sdfr 10136865Sdfr/* 10236865Sdfr * quick version of vm_fault 10336865Sdfr */ 10451474Sdillonint 10536865Sdfrvm_fault_quick(v, prot) 10636865Sdfr caddr_t v; 10736865Sdfr int prot; 10836865Sdfr{ 10951474Sdillon int r; 11036865Sdfr if (prot & VM_PROT_WRITE) 11151474Sdillon r = subyte(v, fubyte(v)); 11236865Sdfr else 11351474Sdillon r = fubyte(v); 11451474Sdillon return(r); 11536865Sdfr} 11636865Sdfr 11736865Sdfr/* 11836865Sdfr * Finish a fork operation, with process p2 nearly set up. 11936865Sdfr * Copy and update the pcb, set up the stack so that the child 12036865Sdfr * ready to run and return to user mode. 12136865Sdfr */ 12236865Sdfrvoid 12390361Sjuliancpu_fork(struct thread *td1, struct proc *p2, struct thread *td2, int flags) 12436865Sdfr{ 12584977Sbenno struct proc *p1; 12684977Sbenno struct trapframe *tf; 12784977Sbenno struct callframe *cf; 12890643Sbenno struct pcb *pcb; 12984977Sbenno 13091467Sbenno KASSERT(td1 == curthread || td1 == &thread0, 13190643Sbenno ("cpu_fork: p1 not curproc and not proc0")); 13284977Sbenno CTR3(KTR_PROC, "cpu_fork: called td1=%08x p2=%08x flags=%x", (u_int)td1, (u_int)p2, flags); 13384977Sbenno 13484977Sbenno if ((flags & RFPROC) == 0) 13584977Sbenno return; 13684977Sbenno 13784977Sbenno p1 = td1->td_proc; 13884977Sbenno 13991467Sbenno pcb = (struct pcb *)((td2->td_kstack + KSTACK_PAGES * PAGE_SIZE - 14091467Sbenno sizeof(struct pcb)) & ~0x2fU); 14190643Sbenno td2->td_pcb = pcb; 14284977Sbenno 14390643Sbenno /* Copy the pcb */ 14490643Sbenno bcopy(td1->td_pcb, pcb, sizeof(struct pcb)); 14584977Sbenno 14684977Sbenno /* 14790643Sbenno * Create a fresh stack for the new process. 14884977Sbenno * Copy the trap frame for the return to user mode as if from a 14984977Sbenno * syscall. This copies most of the user mode register values. 15084977Sbenno */ 15190643Sbenno tf = (struct trapframe *)pcb - 1; 15290643Sbenno bcopy(td1->td_frame, tf, sizeof(*tf)); 15384977Sbenno 15490643Sbenno /* XXX: Set up trap frame? */ 15590643Sbenno 15690643Sbenno td2->td_frame = tf; 15790643Sbenno 15890643Sbenno cf = (struct callframe *)tf - 1; 15991467Sbenno cf->cf_func = (register_t)fork_return; 16091467Sbenno cf->cf_arg0 = (register_t)td2; 16191467Sbenno cf->cf_arg1 = (register_t)tf; 16284977Sbenno 16391467Sbenno pcb->pcb_sp = (register_t)cf; 16491467Sbenno pcb->pcb_lr = (register_t)fork_trampoline; 16584977Sbenno 16690643Sbenno /* 16790643Sbenno * Now cpu_switch() can schedule the new process. 16890643Sbenno */ 16936865Sdfr} 17036865Sdfr 17136865Sdfr/* 17236865Sdfr * Intercept the return address from a freshly forked process that has NOT 17336865Sdfr * been scheduled yet. 17436865Sdfr * 17536865Sdfr * This is needed to make kernel threads stay in kernel mode. 17636865Sdfr */ 17736865Sdfrvoid 17883682Smpcpu_set_fork_handler(td, func, arg) 17983682Smp struct thread *td; 18092842Salfred void (*func)(void *); 18148391Speter void *arg; 18236865Sdfr{ 18384977Sbenno struct callframe *cf; 18484977Sbenno 18584977Sbenno CTR3(KTR_PROC, "cpu_set_fork_handler: called with td=%08x func=%08x arg=%08x", 18684977Sbenno (u_int)td, (u_int)func, (u_int)arg); 18784977Sbenno 18891467Sbenno cf = (struct callframe *)td->td_pcb->pcb_sp; 18984977Sbenno 19091467Sbenno cf->cf_func = (register_t)func; 19191467Sbenno cf->cf_arg0 = (register_t)arg; 19236865Sdfr} 19336865Sdfr 19436865Sdfr/* 19536865Sdfr * cpu_exit is called as the last action during exit. 19636865Sdfr * We release the address space of the process, block interrupts, 19736865Sdfr * and call switch_exit. switch_exit switches to proc0's PCB and stack, 19836865Sdfr * then jumps into the middle of cpu_switch, as if it were switching 19936865Sdfr * from proc0. 20036865Sdfr */ 20136865Sdfrvoid 20283682Smpcpu_exit(td) 20383682Smp register struct thread *td; 20436865Sdfr{ 20536865Sdfr} 20636865Sdfr 20736865Sdfrvoid 20883682Smpcpu_wait(td) 20983682Smp struct proc *td; 21036865Sdfr{ 21183276Speter} 21236865Sdfr 21383276Speter/* Temporary helper */ 21483276Spetervoid 21583276Spetercpu_throw(void) 21683276Speter{ 21783276Speter 21883276Speter cpu_switch(); 21983276Speter panic("cpu_throw() didn't"); 22036865Sdfr} 22136865Sdfr 22236865Sdfr/* 22336865Sdfr * Dump the machine specific header information at the start of a core dump. 22436865Sdfr */ 22536865Sdfrint 22683682Smpcpu_coredump(td, vp, cred) 22783682Smp struct thread *td; 22836865Sdfr struct vnode *vp; 22936865Sdfr struct ucred *cred; 23036865Sdfr{ 23136865Sdfr 23290643Sbenno return (vn_rdwr(UIO_WRITE, vp, (caddr_t)td->td_proc->p_uarea, 23390643Sbenno ctob(UAREA_PAGES), (off_t)0, UIO_SYSSPACE, IO_UNIT, cred, 23490643Sbenno (int *)NULL, td)); 23536865Sdfr} 23636865Sdfr 23736865Sdfr/* 23836865Sdfr * Map an IO request into kernel virtual address space. 23936865Sdfr * 24036865Sdfr * All requests are (re)mapped into kernel VA space. 24136865Sdfr * Notice that we use b_bufsize for the size of the buffer 24236865Sdfr * to be mapped. b_bcount might be modified by the driver. 24336865Sdfr */ 24436865Sdfrvoid 24536865Sdfrvmapbuf(bp) 24636865Sdfr register struct buf *bp; 24736865Sdfr{ 24836865Sdfr register caddr_t addr, v, kva; 24936865Sdfr vm_offset_t pa; 25036865Sdfr 25179224Sdillon GIANT_REQUIRED; 25279224Sdillon 25336865Sdfr if ((bp->b_flags & B_PHYS) == 0) 25436865Sdfr panic("vmapbuf"); 25536865Sdfr 25636865Sdfr for (v = bp->b_saveaddr, addr = (caddr_t)trunc_page(bp->b_data); 25736865Sdfr addr < bp->b_data + bp->b_bufsize; 25836865Sdfr addr += PAGE_SIZE, v += PAGE_SIZE) { 25936865Sdfr /* 26036865Sdfr * Do the vm_fault if needed; do the copy-on-write thing 26136865Sdfr * when reading stuff off device into memory. 26236865Sdfr */ 26384381Smjacob vm_fault_quick((addr >= bp->b_data) ? addr : bp->b_data, 26458345Sphk (bp->b_iocmd == BIO_READ)?(VM_PROT_READ|VM_PROT_WRITE):VM_PROT_READ); 26536865Sdfr pa = trunc_page(pmap_kextract((vm_offset_t) addr)); 26636865Sdfr if (pa == 0) 26736865Sdfr panic("vmapbuf: page not present"); 26836865Sdfr vm_page_hold(PHYS_TO_VM_PAGE(pa)); 26936865Sdfr pmap_kenter((vm_offset_t) v, pa); 27036865Sdfr } 27136865Sdfr 27236865Sdfr kva = bp->b_saveaddr; 27336865Sdfr bp->b_saveaddr = bp->b_data; 27436865Sdfr bp->b_data = kva + (((vm_offset_t) bp->b_data) & PAGE_MASK); 27536865Sdfr} 27636865Sdfr 27736865Sdfr/* 27836865Sdfr * Free the io map PTEs associated with this IO operation. 27936865Sdfr * We also invalidate the TLB entries and restore the original b_addr. 28036865Sdfr */ 28136865Sdfrvoid 28236865Sdfrvunmapbuf(bp) 28336865Sdfr register struct buf *bp; 28436865Sdfr{ 28536865Sdfr register caddr_t addr; 28636865Sdfr vm_offset_t pa; 28736865Sdfr 28879224Sdillon GIANT_REQUIRED; 28979224Sdillon 29036865Sdfr if ((bp->b_flags & B_PHYS) == 0) 29136865Sdfr panic("vunmapbuf"); 29236865Sdfr 29336865Sdfr for (addr = (caddr_t)trunc_page(bp->b_data); 29436865Sdfr addr < bp->b_data + bp->b_bufsize; 29536865Sdfr addr += PAGE_SIZE) { 29636865Sdfr pa = trunc_page(pmap_kextract((vm_offset_t) addr)); 29736865Sdfr pmap_kremove((vm_offset_t) addr); 29836865Sdfr vm_page_unhold(PHYS_TO_VM_PAGE(pa)); 29936865Sdfr } 30036865Sdfr 30136865Sdfr bp->b_data = bp->b_saveaddr; 30236865Sdfr} 30336865Sdfr 30436865Sdfr/* 30565557Sjasone * Reset back to firmware. 30636865Sdfr */ 30736865Sdfrvoid 30836865Sdfrcpu_reset() 30936865Sdfr{ 31078342Sbenno OF_exit(); 31136865Sdfr} 31236865Sdfr 31336865Sdfrint 31443209Sjuliangrow_stack(p, sp) 31543209Sjulian struct proc *p; 31643209Sjulian size_t sp; 31743209Sjulian{ 31843209Sjulian int rv; 31936865Sdfr 32043209Sjulian rv = vm_map_growstack (p, sp); 32143209Sjulian if (rv != KERN_SUCCESS) 32243209Sjulian return (0); 32343209Sjulian 32443209Sjulian return (1); 32543209Sjulian} 32643209Sjulian 32736865Sdfr/* 32836865Sdfr * Software interrupt handler for queued VM system processing. 32936865Sdfr */ 33036865Sdfrvoid 33167551Sjhbswi_vm(void *dummy) 33236865Sdfr{ 33378342Sbenno#if 0 /* XXX: Don't have busdma stuff yet */ 33436865Sdfr if (busdma_swi_pending != 0) 33536865Sdfr busdma_swi(); 33678342Sbenno#endif 33736865Sdfr} 33836865Sdfr 33936865Sdfr/* 34036865Sdfr * Tell whether this address is in some physical memory region. 34136865Sdfr * Currently used by the kernel coredump code in order to avoid 34236865Sdfr * dumping the ``ISA memory hole'' which could cause indefinite hangs, 34336865Sdfr * or other unpredictable behaviour. 34436865Sdfr */ 34536865Sdfr 34636865Sdfr 34736865Sdfrint 34836865Sdfris_physical_memory(addr) 34936865Sdfr vm_offset_t addr; 35036865Sdfr{ 35136865Sdfr /* 35236865Sdfr * stuff other tests for known memory-mapped devices (PCI?) 35336865Sdfr * here 35436865Sdfr */ 35536865Sdfr 35636865Sdfr return 1; 35736865Sdfr} 358