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 * $FreeBSD$ 4236865Sdfr */ 43139825Simp/*- 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> 8336865Sdfr#include <sys/sysctl.h> 84199135Skib#include <sys/sysent.h> 8554207Speter#include <sys/unistd.h> 8636865Sdfr 8736865Sdfr#include <machine/cpu.h> 8841499Sdfr#include <machine/fpu.h> 8997397Sbenno#include <machine/frame.h> 9036865Sdfr#include <machine/md_var.h> 91138129Sdas#include <machine/pcb.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 102190681Snwhitehorn/* 10336865Sdfr * Finish a fork operation, with process p2 nearly set up. 10436865Sdfr * Copy and update the pcb, set up the stack so that the child 10536865Sdfr * ready to run and return to user mode. 10636865Sdfr */ 10736865Sdfrvoid 10890361Sjuliancpu_fork(struct thread *td1, struct proc *p2, struct thread *td2, int flags) 10936865Sdfr{ 11084977Sbenno struct trapframe *tf; 11184977Sbenno struct callframe *cf; 11290643Sbenno struct pcb *pcb; 11384977Sbenno 11491467Sbenno KASSERT(td1 == curthread || td1 == &thread0, 11590643Sbenno ("cpu_fork: p1 not curproc and not proc0")); 116209975Snwhitehorn CTR3(KTR_PROC, "cpu_fork: called td1=%p p2=%p flags=%x", 117209975Snwhitehorn td1, p2, flags); 11884977Sbenno 11984977Sbenno if ((flags & RFPROC) == 0) 12084977Sbenno return; 12184977Sbenno 122127582Speter pcb = (struct pcb *)((td2->td_kstack + 123209975Snwhitehorn td2->td_kstack_pages * PAGE_SIZE - sizeof(struct pcb)) & ~0x2fUL); 12490643Sbenno td2->td_pcb = pcb; 12584977Sbenno 12690643Sbenno /* Copy the pcb */ 12790643Sbenno bcopy(td1->td_pcb, pcb, sizeof(struct pcb)); 12884977Sbenno 12984977Sbenno /* 13090643Sbenno * Create a fresh stack for the new process. 13184977Sbenno * Copy the trap frame for the return to user mode as if from a 13284977Sbenno * syscall. This copies most of the user mode register values. 13384977Sbenno */ 13490643Sbenno tf = (struct trapframe *)pcb - 1; 13590643Sbenno bcopy(td1->td_frame, tf, sizeof(*tf)); 13684977Sbenno 13797397Sbenno /* Set up trap frame. */ 13897397Sbenno tf->fixreg[FIRSTARG] = 0; 13997397Sbenno tf->fixreg[FIRSTARG + 1] = 0; 14097397Sbenno tf->cr &= ~0x10000000; 14190643Sbenno 14290643Sbenno td2->td_frame = tf; 14390643Sbenno 14490643Sbenno cf = (struct callframe *)tf - 1; 145132520Sgrehan memset(cf, 0, sizeof(struct callframe)); 146291442Snwhitehorn #if defined(__powerpc64__) && (!defined(_CALL_ELF) || _CALL_ELF == 1) 147277334Snwhitehorn cf->cf_toc = ((register_t *)fork_return)[1]; 148209975Snwhitehorn #endif 14991467Sbenno cf->cf_func = (register_t)fork_return; 15091467Sbenno cf->cf_arg0 = (register_t)td2; 15191467Sbenno cf->cf_arg1 = (register_t)tf; 15284977Sbenno 15391467Sbenno pcb->pcb_sp = (register_t)cf; 154255273Snwhitehorn KASSERT(pcb->pcb_sp % 16 == 0, ("stack misaligned")); 155291442Snwhitehorn #if defined(__powerpc64__) && (!defined(_CALL_ELF) || _CALL_ELF == 1) 156209975Snwhitehorn pcb->pcb_lr = ((register_t *)fork_trampoline)[0]; 157209975Snwhitehorn pcb->pcb_toc = ((register_t *)fork_trampoline)[1]; 158209975Snwhitehorn #else 15991467Sbenno pcb->pcb_lr = (register_t)fork_trampoline; 160291442Snwhitehorn pcb->pcb_context[0] = pcb->pcb_lr; 161209975Snwhitehorn #endif 162256792Snwhitehorn #ifdef AIM 163209975Snwhitehorn pcb->pcb_cpu.aim.usr_vsid = 0; 164256792Snwhitehorn #endif 16584977Sbenno 166170305Sjeff /* Setup to release spin count in fork_exit(). */ 167144637Sjhb td2->td_md.md_spinlock_count = 1; 168144637Sjhb td2->td_md.md_saved_msr = PSL_KERNSET; 169144637Sjhb 17090643Sbenno /* 17190643Sbenno * Now cpu_switch() can schedule the new process. 17290643Sbenno */ 17336865Sdfr} 17436865Sdfr 17536865Sdfr/* 17636865Sdfr * Intercept the return address from a freshly forked process that has NOT 17736865Sdfr * been scheduled yet. 17836865Sdfr * 17936865Sdfr * This is needed to make kernel threads stay in kernel mode. 18036865Sdfr */ 18136865Sdfrvoid 182301961Skibcpu_fork_kthread_handler(struct thread *td, void (*func)(void *), void *arg) 18336865Sdfr{ 184256792Snwhitehorn struct callframe *cf; 18584977Sbenno 186209975Snwhitehorn CTR4(KTR_PROC, "%s called with td=%p func=%p arg=%p", 187209975Snwhitehorn __func__, td, func, arg); 18884977Sbenno 18991467Sbenno cf = (struct callframe *)td->td_pcb->pcb_sp; 19084977Sbenno 19191467Sbenno cf->cf_func = (register_t)func; 19291467Sbenno cf->cf_arg0 = (register_t)arg; 19336865Sdfr} 19436865Sdfr 19536865Sdfrvoid 196256792Snwhitehorncpu_exit(struct thread *td) 19736865Sdfr{ 198256792Snwhitehorn 19936865Sdfr} 20036865Sdfr 20136865Sdfr/* 20236865Sdfr * Software interrupt handler for queued VM system processing. 203126474Sgrehan */ 204126474Sgrehanvoid 205126474Sgrehanswi_vm(void *dummy) 206126474Sgrehan{ 207209950Snwhitehorn 20836865Sdfr if (busdma_swi_pending != 0) 20936865Sdfr busdma_swi(); 21036865Sdfr} 21136865Sdfr 21236865Sdfr/* 21336865Sdfr * Tell whether this address is in some physical memory region. 21436865Sdfr * Currently used by the kernel coredump code in order to avoid 21536865Sdfr * dumping the ``ISA memory hole'' which could cause indefinite hangs, 21636865Sdfr * or other unpredictable behaviour. 21736865Sdfr */ 21836865Sdfrint 219256792Snwhitehornis_physical_memory(vm_offset_t addr) 22036865Sdfr{ 221256792Snwhitehorn 22236865Sdfr /* 22336865Sdfr * stuff other tests for known memory-mapped devices (PCI?) 22436865Sdfr * here 22536865Sdfr */ 226256792Snwhitehorn return (1); 22736865Sdfr} 22899659Sbenno 22999659Sbenno/* 230209975Snwhitehorn * CPU threading functions related to the VM layer. These could be used 231209975Snwhitehorn * to map the SLB bits required for the kernel stack instead of forcing a 232209975Snwhitehorn * fixed-size KVA. 23399659Sbenno */ 23499659Sbenno 23599659Sbennovoid 236119004Smarcelcpu_thread_swapin(struct thread *td) 237119004Smarcel{ 238256792Snwhitehorn 23999659Sbenno} 24099659Sbenno 24199659Sbennovoid 242119004Smarcelcpu_thread_swapout(struct thread *td) 243119004Smarcel{ 244256792Snwhitehorn 245119004Smarcel} 246119004Smarcel 247