vm_machdep.c revision 132520
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 132520 2004-07-22 01:28:51Z grehan $ 4236865Sdfr */ 4336865Sdfr/* 4436865Sdfr * Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University. 4536865Sdfr * All rights reserved. 4636865Sdfr * 4736865Sdfr * Author: Chris G. Demetriou 48126474Sgrehan * 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. 54126474Sgrehan * 55126474Sgrehan * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 56126474Sgrehan * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 5736865Sdfr * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 58126474Sgrehan * 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> 82119563Salc#include <sys/mbuf.h> 83122780Salc#include <sys/sf_buf.h> 8436865Sdfr#include <sys/sysctl.h> 8554207Speter#include <sys/unistd.h> 8636865Sdfr 8736865Sdfr#include <machine/clock.h> 8836865Sdfr#include <machine/cpu.h> 8941499Sdfr#include <machine/fpu.h> 9097397Sbenno#include <machine/frame.h> 9136865Sdfr#include <machine/md_var.h> 9236865Sdfr 9378342Sbenno#include <dev/ofw/openfirm.h> 9478342Sbenno 9536865Sdfr#include <vm/vm.h> 9636865Sdfr#include <vm/vm_param.h> 9736865Sdfr#include <vm/vm_kern.h> 9836865Sdfr#include <vm/vm_page.h> 9936865Sdfr#include <vm/vm_map.h> 10036865Sdfr#include <vm/vm_extern.h> 10136865Sdfr 10236865Sdfr#include <sys/user.h> 10336865Sdfr 10436865Sdfr/* 10536865Sdfr * Finish a fork operation, with process p2 nearly set up. 10636865Sdfr * Copy and update the pcb, set up the stack so that the child 10736865Sdfr * ready to run and return to user mode. 10836865Sdfr */ 10936865Sdfrvoid 11090361Sjuliancpu_fork(struct thread *td1, struct proc *p2, struct thread *td2, int flags) 11136865Sdfr{ 11284977Sbenno struct proc *p1; 11384977Sbenno struct trapframe *tf; 11484977Sbenno struct callframe *cf; 11590643Sbenno struct pcb *pcb; 11684977Sbenno 11791467Sbenno KASSERT(td1 == curthread || td1 == &thread0, 11890643Sbenno ("cpu_fork: p1 not curproc and not proc0")); 11984977Sbenno CTR3(KTR_PROC, "cpu_fork: called td1=%08x p2=%08x flags=%x", (u_int)td1, (u_int)p2, flags); 12084977Sbenno 12184977Sbenno if ((flags & RFPROC) == 0) 12284977Sbenno return; 12384977Sbenno 12484977Sbenno p1 = td1->td_proc; 12584977Sbenno 126127582Speter pcb = (struct pcb *)((td2->td_kstack + 127127582Speter td2->td_kstack_pages * PAGE_SIZE - sizeof(struct pcb)) & ~0x2fU); 12890643Sbenno td2->td_pcb = pcb; 12984977Sbenno 13090643Sbenno /* Copy the pcb */ 13190643Sbenno bcopy(td1->td_pcb, pcb, sizeof(struct pcb)); 13284977Sbenno 13384977Sbenno /* 13490643Sbenno * Create a fresh stack for the new process. 13584977Sbenno * Copy the trap frame for the return to user mode as if from a 13684977Sbenno * syscall. This copies most of the user mode register values. 13784977Sbenno */ 13890643Sbenno tf = (struct trapframe *)pcb - 1; 13990643Sbenno bcopy(td1->td_frame, tf, sizeof(*tf)); 14084977Sbenno 14197397Sbenno /* Set up trap frame. */ 14297397Sbenno tf->fixreg[FIRSTARG] = 0; 14397397Sbenno tf->fixreg[FIRSTARG + 1] = 0; 14497397Sbenno tf->cr &= ~0x10000000; 14590643Sbenno 14690643Sbenno td2->td_frame = tf; 14790643Sbenno 14890643Sbenno cf = (struct callframe *)tf - 1; 149132520Sgrehan memset(cf, 0, sizeof(struct callframe)); 15091467Sbenno cf->cf_func = (register_t)fork_return; 15191467Sbenno cf->cf_arg0 = (register_t)td2; 15291467Sbenno cf->cf_arg1 = (register_t)tf; 15384977Sbenno 15491467Sbenno pcb->pcb_sp = (register_t)cf; 15591467Sbenno pcb->pcb_lr = (register_t)fork_trampoline; 156105611Sgrehan pcb->pcb_usr = kernel_pmap->pm_sr[USER_SR]; 15784977Sbenno 15890643Sbenno /* 15990643Sbenno * Now cpu_switch() can schedule the new process. 16090643Sbenno */ 16136865Sdfr} 16236865Sdfr 16336865Sdfr/* 16436865Sdfr * Intercept the return address from a freshly forked process that has NOT 16536865Sdfr * been scheduled yet. 16636865Sdfr * 16736865Sdfr * This is needed to make kernel threads stay in kernel mode. 16836865Sdfr */ 16936865Sdfrvoid 17083682Smpcpu_set_fork_handler(td, func, arg) 17183682Smp struct thread *td; 17292842Salfred void (*func)(void *); 17348391Speter void *arg; 17436865Sdfr{ 17584977Sbenno struct callframe *cf; 17684977Sbenno 17784977Sbenno CTR3(KTR_PROC, "cpu_set_fork_handler: called with td=%08x func=%08x arg=%08x", 17884977Sbenno (u_int)td, (u_int)func, (u_int)arg); 17984977Sbenno 18091467Sbenno cf = (struct callframe *)td->td_pcb->pcb_sp; 18184977Sbenno 18291467Sbenno cf->cf_func = (register_t)func; 18391467Sbenno cf->cf_arg0 = (register_t)arg; 18436865Sdfr} 18536865Sdfr 18636865Sdfr/* 18736865Sdfr * cpu_exit is called as the last action during exit. 18836865Sdfr * We release the address space of the process, block interrupts, 18936865Sdfr * and call switch_exit. switch_exit switches to proc0's PCB and stack, 19036865Sdfr * then jumps into the middle of cpu_switch, as if it were switching 19136865Sdfr * from proc0. 19236865Sdfr */ 19336865Sdfrvoid 19483682Smpcpu_exit(td) 19583682Smp register struct thread *td; 19636865Sdfr{ 19736865Sdfr} 19836865Sdfr 19983276Speter/* Temporary helper */ 20083276Spetervoid 201118893Sgrehancpu_throw(struct thread *old, struct thread *new) 20283276Speter{ 20383276Speter 204118893Sgrehan cpu_switch(old, new); 20583276Speter panic("cpu_throw() didn't"); 20636865Sdfr} 20736865Sdfr 20836865Sdfr/* 20965557Sjasone * Reset back to firmware. 21036865Sdfr */ 21136865Sdfrvoid 21236865Sdfrcpu_reset() 21336865Sdfr{ 21478342Sbenno OF_exit(); 21536865Sdfr} 21636865Sdfr 21736865Sdfr/* 218128395Salc * Allocate an sf_buf for the given vm_page. On this machine, however, there 219128395Salc * is no sf_buf object. Instead, an opaque pointer to the given vm_page is 220128395Salc * returned. 221119563Salc */ 222119563Salcstruct sf_buf * 223127788Salcsf_buf_alloc(struct vm_page *m, int pri) 224119563Salc{ 225119563Salc 226128395Salc return ((struct sf_buf *)m); 227119563Salc} 228119563Salc 229119563Salc/* 230128395Salc * Free the sf_buf. In fact, do nothing because there are no resources 231128395Salc * associated with the sf_buf. 232119563Salc */ 233119563Salcvoid 234127086Salcsf_buf_free(struct sf_buf *sf) 235119563Salc{ 236119563Salc} 237119563Salc 238119563Salc/* 23936865Sdfr * Software interrupt handler for queued VM system processing. 240126474Sgrehan */ 241126474Sgrehanvoid 242126474Sgrehanswi_vm(void *dummy) 243126474Sgrehan{ 24478342Sbenno#if 0 /* XXX: Don't have busdma stuff yet */ 24536865Sdfr if (busdma_swi_pending != 0) 24636865Sdfr busdma_swi(); 24778342Sbenno#endif 24836865Sdfr} 24936865Sdfr 25036865Sdfr/* 25136865Sdfr * Tell whether this address is in some physical memory region. 25236865Sdfr * Currently used by the kernel coredump code in order to avoid 25336865Sdfr * dumping the ``ISA memory hole'' which could cause indefinite hangs, 25436865Sdfr * or other unpredictable behaviour. 25536865Sdfr */ 25636865Sdfr 25736865Sdfr 25836865Sdfrint 25936865Sdfris_physical_memory(addr) 26036865Sdfr vm_offset_t addr; 26136865Sdfr{ 26236865Sdfr /* 26336865Sdfr * stuff other tests for known memory-mapped devices (PCI?) 26436865Sdfr * here 26536865Sdfr */ 26636865Sdfr 26736865Sdfr return 1; 26836865Sdfr} 26999659Sbenno 27099659Sbenno/* 27199659Sbenno * KSE functions 27299659Sbenno */ 27399659Sbennovoid 274126474Sgrehancpu_thread_exit(struct thread *td) 27599659Sbenno{ 27699659Sbenno} 27799659Sbenno 27899659Sbennovoid 279126474Sgrehancpu_thread_clean(struct thread *td) 280107180Smux{ 281107180Smux} 282107180Smux 283107180Smuxvoid 28499659Sbennocpu_thread_setup(struct thread *td) 28599659Sbenno{ 286126474Sgrehan struct pcb *pcb; 287126474Sgrehan 288127618Sbenno pcb = (struct pcb *)((td->td_kstack + td->td_kstack_pages * PAGE_SIZE - 289126474Sgrehan sizeof(struct pcb)) & ~0x2fU); 290126474Sgrehan td->td_pcb = pcb; 291126474Sgrehan td->td_frame = (struct trapframe *)pcb - 1; 292119004Smarcel} 29399659Sbenno 294119004Smarcelvoid 295119004Smarcelcpu_thread_swapin(struct thread *td) 296119004Smarcel{ 29799659Sbenno} 29899659Sbenno 29999659Sbennovoid 300119004Smarcelcpu_thread_swapout(struct thread *td) 301119004Smarcel{ 302119004Smarcel} 303119004Smarcel 304119004Smarcelvoid 305115858Smarcelcpu_set_upcall(struct thread *td, struct thread *td0) 30699659Sbenno{ 307126474Sgrehan struct pcb *pcb2; 308126474Sgrehan struct trapframe *tf; 309126474Sgrehan struct callframe *cf; 310126474Sgrehan 311126474Sgrehan pcb2 = td->td_pcb; 312126474Sgrehan 313126474Sgrehan /* Copy the upcall pcb */ 314126474Sgrehan bcopy(td0->td_pcb, pcb2, sizeof(*pcb2)); 315126474Sgrehan 316126474Sgrehan /* Create a stack for the new thread */ 317126474Sgrehan tf = td->td_frame; 318126474Sgrehan bcopy(td0->td_frame, tf, sizeof(struct trapframe)); 319126474Sgrehan tf->fixreg[FIRSTARG] = 0; 320126474Sgrehan tf->fixreg[FIRSTARG + 1] = 0; 321126474Sgrehan tf->cr &= ~0x10000000; 322126474Sgrehan 323126474Sgrehan /* Set registers for trampoline to user mode. */ 324126474Sgrehan cf = (struct callframe *)tf - 1; 325132520Sgrehan memset(cf, 0, sizeof(struct callframe)); 326126474Sgrehan cf->cf_func = (register_t)fork_return; 327126474Sgrehan cf->cf_arg0 = (register_t)td; 328126474Sgrehan cf->cf_arg1 = (register_t)tf; 329126474Sgrehan 330126474Sgrehan pcb2->pcb_sp = (register_t)cf; 331126474Sgrehan pcb2->pcb_lr = (register_t)fork_trampoline; 332126474Sgrehan pcb2->pcb_usr = kernel_pmap->pm_sr[USER_SR]; 33399659Sbenno} 33499659Sbenno 33599659Sbennovoid 336111028Sjeffcpu_set_upcall_kse(struct thread *td, struct kse_upcall *ku) 33799659Sbenno{ 338126474Sgrehan struct trapframe *tf; 339126474Sgrehan uint32_t sp; 340126474Sgrehan 341126474Sgrehan tf = td->td_frame; 342126474Sgrehan /* align stack and alloc space for frame ptr and saved LR */ 343126474Sgrehan sp = ((uint32_t)ku->ku_stack.ss_sp + ku->ku_stack.ss_size 344126474Sgrehan - 2*sizeof(u_int32_t)) & ~0x1f; 345126474Sgrehan bzero(tf, sizeof(struct trapframe)); 346126474Sgrehan 347126474Sgrehan tf->fixreg[1] = (register_t)sp; 348126474Sgrehan tf->fixreg[3] = (register_t)ku->ku_mailbox; 349126474Sgrehan tf->srr0 = (register_t)ku->ku_func; 350126474Sgrehan tf->srr1 = PSL_MBO | PSL_USERSET | PSL_FE_DFLT; 351126474Sgrehan td->td_pcb->pcb_flags = 0; 352126474Sgrehan 353126474Sgrehan td->td_retval[0] = (register_t)ku->ku_func; 354126474Sgrehan td->td_retval[1] = 0; 35599659Sbenno} 356