vm_machdep.c revision 90643
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 90643 2002-02-14 01:39:11Z benno $ 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; 12884977Sbenno struct switchframe *sf; 12990643Sbenno struct pcb *pcb; 13084977Sbenno 13190643Sbenno KASSERT(td1 == curthread || td1 == thread0, 13290643Sbenno ("cpu_fork: p1 not curproc and not proc0")); 13384977Sbenno CTR3(KTR_PROC, "cpu_fork: called td1=%08x p2=%08x flags=%x", (u_int)td1, (u_int)p2, flags); 13484977Sbenno 13584977Sbenno if ((flags & RFPROC) == 0) 13684977Sbenno return; 13784977Sbenno 13884977Sbenno p1 = td1->td_proc; 13984977Sbenno 14090643Sbenno pcb = (struct pcb *)(td2->td_kstack + KSTACK_PAGES * PAGE_SIZE - 14190643Sbenno sizeof(struct pcb)); 14290643Sbenno td2->td_pcb = pcb; 14384977Sbenno 14490643Sbenno /* Copy the pcb */ 14590643Sbenno bcopy(td1->td_pcb, pcb, sizeof(struct pcb)); 14684977Sbenno 14784977Sbenno /* 14890643Sbenno * Create a fresh stack for the new process. 14984977Sbenno * Copy the trap frame for the return to user mode as if from a 15084977Sbenno * syscall. This copies most of the user mode register values. 15184977Sbenno */ 15284977Sbenno 15390643Sbenno tf = (struct trapframe *)pcb - 1; 15490643Sbenno bcopy(td1->td_frame, tf, sizeof(*tf)); 15584977Sbenno 15690643Sbenno /* XXX: Set up trap frame? */ 15790643Sbenno 15890643Sbenno td2->td_frame = tf; 15990643Sbenno 16090643Sbenno /* 16190643Sbenno * There happens to be a callframe, too. 16290643Sbenno */ 16390643Sbenno cf = (struct callframe *)tf - 1; 16484977Sbenno cf->lr = (int)fork_trampoline; 16584977Sbenno 16690643Sbenno /* 16790643Sbenno * Below that, we allocate the switch frame. 16890643Sbenno */ 16990643Sbenno sf = (struct switchframe *)cf - 1; 17090643Sbenno sf->sp = (int)cf; 17190643Sbenno pcb->pcb_sp = (int)sf; 17284977Sbenno 17390643Sbenno /* 17490643Sbenno * Now cpu_switch() can schedule the new process. 17590643Sbenno */ 17636865Sdfr} 17736865Sdfr 17836865Sdfr/* 17936865Sdfr * Intercept the return address from a freshly forked process that has NOT 18036865Sdfr * been scheduled yet. 18136865Sdfr * 18236865Sdfr * This is needed to make kernel threads stay in kernel mode. 18336865Sdfr */ 18436865Sdfrvoid 18583682Smpcpu_set_fork_handler(td, func, arg) 18683682Smp struct thread *td; 18748391Speter void (*func) __P((void *)); 18848391Speter void *arg; 18936865Sdfr{ 19084977Sbenno struct switchframe *sf; 19184977Sbenno struct callframe *cf; 19284977Sbenno 19384977Sbenno CTR3(KTR_PROC, "cpu_set_fork_handler: called with td=%08x func=%08x arg=%08x", 19484977Sbenno (u_int)td, (u_int)func, (u_int)arg); 19584977Sbenno 19684977Sbenno sf = (struct switchframe *)td->td_pcb->pcb_sp; 19784977Sbenno cf = (struct callframe *)sf->sp; 19884977Sbenno 19984977Sbenno cf->r31 = (register_t)func; 20084977Sbenno cf->r30 = (register_t)arg; 20136865Sdfr} 20236865Sdfr 20336865Sdfr/* 20436865Sdfr * cpu_exit is called as the last action during exit. 20536865Sdfr * We release the address space of the process, block interrupts, 20636865Sdfr * and call switch_exit. switch_exit switches to proc0's PCB and stack, 20736865Sdfr * then jumps into the middle of cpu_switch, as if it were switching 20836865Sdfr * from proc0. 20936865Sdfr */ 21036865Sdfrvoid 21183682Smpcpu_exit(td) 21283682Smp register struct thread *td; 21336865Sdfr{ 21436865Sdfr} 21536865Sdfr 21636865Sdfrvoid 21783682Smpcpu_wait(td) 21883682Smp struct proc *td; 21936865Sdfr{ 22083276Speter} 22136865Sdfr 22283276Speter/* Temporary helper */ 22383276Spetervoid 22483276Spetercpu_throw(void) 22583276Speter{ 22683276Speter 22783276Speter cpu_switch(); 22883276Speter panic("cpu_throw() didn't"); 22936865Sdfr} 23036865Sdfr 23136865Sdfr/* 23236865Sdfr * Dump the machine specific header information at the start of a core dump. 23336865Sdfr */ 23436865Sdfrint 23583682Smpcpu_coredump(td, vp, cred) 23683682Smp struct thread *td; 23736865Sdfr struct vnode *vp; 23836865Sdfr struct ucred *cred; 23936865Sdfr{ 24036865Sdfr 24190643Sbenno return (vn_rdwr(UIO_WRITE, vp, (caddr_t)td->td_proc->p_uarea, 24290643Sbenno ctob(UAREA_PAGES), (off_t)0, UIO_SYSSPACE, IO_UNIT, cred, 24390643Sbenno (int *)NULL, td)); 24436865Sdfr} 24536865Sdfr 24636865Sdfr/* 24736865Sdfr * Map an IO request into kernel virtual address space. 24836865Sdfr * 24936865Sdfr * All requests are (re)mapped into kernel VA space. 25036865Sdfr * Notice that we use b_bufsize for the size of the buffer 25136865Sdfr * to be mapped. b_bcount might be modified by the driver. 25236865Sdfr */ 25336865Sdfrvoid 25436865Sdfrvmapbuf(bp) 25536865Sdfr register struct buf *bp; 25636865Sdfr{ 25736865Sdfr register caddr_t addr, v, kva; 25836865Sdfr vm_offset_t pa; 25936865Sdfr 26079224Sdillon GIANT_REQUIRED; 26179224Sdillon 26236865Sdfr if ((bp->b_flags & B_PHYS) == 0) 26336865Sdfr panic("vmapbuf"); 26436865Sdfr 26536865Sdfr for (v = bp->b_saveaddr, addr = (caddr_t)trunc_page(bp->b_data); 26636865Sdfr addr < bp->b_data + bp->b_bufsize; 26736865Sdfr addr += PAGE_SIZE, v += PAGE_SIZE) { 26836865Sdfr /* 26936865Sdfr * Do the vm_fault if needed; do the copy-on-write thing 27036865Sdfr * when reading stuff off device into memory. 27136865Sdfr */ 27284381Smjacob vm_fault_quick((addr >= bp->b_data) ? addr : bp->b_data, 27358345Sphk (bp->b_iocmd == BIO_READ)?(VM_PROT_READ|VM_PROT_WRITE):VM_PROT_READ); 27436865Sdfr pa = trunc_page(pmap_kextract((vm_offset_t) addr)); 27536865Sdfr if (pa == 0) 27636865Sdfr panic("vmapbuf: page not present"); 27736865Sdfr vm_page_hold(PHYS_TO_VM_PAGE(pa)); 27836865Sdfr pmap_kenter((vm_offset_t) v, pa); 27936865Sdfr } 28036865Sdfr 28136865Sdfr kva = bp->b_saveaddr; 28236865Sdfr bp->b_saveaddr = bp->b_data; 28336865Sdfr bp->b_data = kva + (((vm_offset_t) bp->b_data) & PAGE_MASK); 28436865Sdfr} 28536865Sdfr 28636865Sdfr/* 28736865Sdfr * Free the io map PTEs associated with this IO operation. 28836865Sdfr * We also invalidate the TLB entries and restore the original b_addr. 28936865Sdfr */ 29036865Sdfrvoid 29136865Sdfrvunmapbuf(bp) 29236865Sdfr register struct buf *bp; 29336865Sdfr{ 29436865Sdfr register caddr_t addr; 29536865Sdfr vm_offset_t pa; 29636865Sdfr 29779224Sdillon GIANT_REQUIRED; 29879224Sdillon 29936865Sdfr if ((bp->b_flags & B_PHYS) == 0) 30036865Sdfr panic("vunmapbuf"); 30136865Sdfr 30236865Sdfr for (addr = (caddr_t)trunc_page(bp->b_data); 30336865Sdfr addr < bp->b_data + bp->b_bufsize; 30436865Sdfr addr += PAGE_SIZE) { 30536865Sdfr pa = trunc_page(pmap_kextract((vm_offset_t) addr)); 30636865Sdfr pmap_kremove((vm_offset_t) addr); 30736865Sdfr vm_page_unhold(PHYS_TO_VM_PAGE(pa)); 30836865Sdfr } 30936865Sdfr 31036865Sdfr bp->b_data = bp->b_saveaddr; 31136865Sdfr} 31236865Sdfr 31336865Sdfr/* 31465557Sjasone * Reset back to firmware. 31536865Sdfr */ 31636865Sdfrvoid 31736865Sdfrcpu_reset() 31836865Sdfr{ 31978342Sbenno OF_exit(); 32036865Sdfr} 32136865Sdfr 32236865Sdfrint 32343209Sjuliangrow_stack(p, sp) 32443209Sjulian struct proc *p; 32543209Sjulian size_t sp; 32643209Sjulian{ 32743209Sjulian int rv; 32836865Sdfr 32943209Sjulian rv = vm_map_growstack (p, sp); 33043209Sjulian if (rv != KERN_SUCCESS) 33143209Sjulian return (0); 33243209Sjulian 33343209Sjulian return (1); 33443209Sjulian} 33543209Sjulian 33636865Sdfr/* 33736865Sdfr * Software interrupt handler for queued VM system processing. 33836865Sdfr */ 33936865Sdfrvoid 34067551Sjhbswi_vm(void *dummy) 34136865Sdfr{ 34278342Sbenno#if 0 /* XXX: Don't have busdma stuff yet */ 34336865Sdfr if (busdma_swi_pending != 0) 34436865Sdfr busdma_swi(); 34578342Sbenno#endif 34636865Sdfr} 34736865Sdfr 34836865Sdfr/* 34936865Sdfr * Tell whether this address is in some physical memory region. 35036865Sdfr * Currently used by the kernel coredump code in order to avoid 35136865Sdfr * dumping the ``ISA memory hole'' which could cause indefinite hangs, 35236865Sdfr * or other unpredictable behaviour. 35336865Sdfr */ 35436865Sdfr 35536865Sdfr 35636865Sdfrint 35736865Sdfris_physical_memory(addr) 35836865Sdfr vm_offset_t addr; 35936865Sdfr{ 36036865Sdfr /* 36136865Sdfr * stuff other tests for known memory-mapped devices (PCI?) 36236865Sdfr * here 36336865Sdfr */ 36436865Sdfr 36536865Sdfr return 1; 36636865Sdfr} 367