vm_machdep.c revision 86147
1/*- 2 * Copyright (c) 1982, 1986 The Regents of the University of California. 3 * Copyright (c) 1989, 1990 William Jolitz 4 * Copyright (c) 1994 John Dyson 5 * Copyright (c) 2001 Jake Burkholder. 6 * All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * the Systems Programming Group of the University of Utah Computer 10 * Science Department, and William Jolitz. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the University of 23 * California, Berkeley and its contributors. 24 * 4. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 * 40 * from: @(#)vm_machdep.c 7.3 (Berkeley) 5/13/91 41 * Utah $Hdr: vm_machdep.c 1.16.1.1 89/06/23$ 42 * from: FreeBSD: src/sys/i386/i386/vm_machdep.c,v 1.167 2001/07/12 43 * $FreeBSD: head/sys/sparc64/sparc64/vm_machdep.c 86147 2001-11-06 20:22:18Z tmm $ 44 */ 45 46#include <sys/param.h> 47#include <sys/systm.h> 48#include <sys/proc.h> 49#include <sys/bio.h> 50#include <sys/buf.h> 51#include <sys/unistd.h> 52#include <sys/user.h> 53#include <sys/vmmeter.h> 54 55#include <dev/ofw/openfirm.h> 56 57#include <vm/vm.h> 58#include <vm/vm_extern.h> 59#include <vm/pmap.h> 60 61#include <machine/cpu.h> 62#include <machine/frame.h> 63#include <machine/md_var.h> 64#include <machine/ofw_machdep.h> 65#include <machine/tstate.h> 66 67void 68cpu_exit(struct thread *td) 69{ 70} 71 72/* 73 * Finish a fork operation, with process p2 nearly set up. 74 * Copy and update the pcb, set up the stack so that the child 75 * ready to run and return to user mode. 76 */ 77void 78cpu_fork(struct thread *td1, struct proc *p2, int flags) 79{ 80 struct thread *td2; 81 struct trapframe *tf; 82 struct frame *fp; 83 struct pcb *pcb; 84 85 KASSERT(td1 == curthread || td1 == thread0, 86 ("cpu_fork: p1 not curproc and not proc0")); 87 88 if ((flags & RFPROC) == 0) 89 return; 90 91 td2 = &p2->p_thread; 92 /* The pcb must be aligned on a 64-byte boundary. */ 93 pcb = (struct pcb *)((td2->td_kstack + KSTACK_PAGES * PAGE_SIZE - 94 sizeof(struct pcb)) & ~0x3fUL); 95 td2->td_pcb = pcb; 96 97 /* 98 * Ensure that p1's pcb is up to date. 99 */ 100 td1->td_pcb->pcb_y = rd(y); 101 td1->td_pcb->pcb_fpstate.fp_fprs = rd(fprs); 102 if ((td1->td_frame->tf_tstate & TSTATE_PEF) != 0) { 103 mtx_lock_spin(&sched_lock); 104 savefpctx(&td1->td_pcb->pcb_fpstate); 105 mtx_unlock_spin(&sched_lock); 106 } 107 /* Make sure the copied windows are spilled. */ 108 __asm __volatile("flushw"); 109 /* Copy the pcb (this will copy the windows saved in the pcb, too). */ 110 bcopy(td1->td_pcb, pcb, sizeof(*pcb)); 111 pcb->pcb_cwp = 2; 112 113 /* 114 * Create a new fresh stack for the new process. 115 * Copy the trap frame for the return to user mode as if from a 116 * syscall. This copies most of the user mode register values. 117 */ 118 tf = (struct trapframe *)pcb - 1; 119 bcopy(td1->td_frame, tf, sizeof(*tf)); 120 121 tf->tf_out[0] = 0; /* Child returns zero */ 122 tf->tf_out[1] = 1; /* XXX i386 returns 1 in %edx */ 123 tf->tf_tstate &= ~(TSTATE_XCC_C | TSTATE_CWP_MASK); /* success */ 124 125 td2->td_frame = tf; 126 fp = (struct frame *)tf - 1; 127 fp->f_local[0] = (u_long)fork_return; 128 fp->f_local[1] = (u_long)td2; 129 fp->f_local[2] = (u_long)tf; 130 pcb->pcb_cwp = 0; 131 pcb->pcb_fp = (u_long)fp - SPOFF; 132 pcb->pcb_pc = (u_long)fork_trampoline - 8; 133 134 /* 135 * Now, cpu_switch() can schedule the new process. 136 */ 137} 138 139void 140cpu_reset(void) 141{ 142 static char bspec[64] = ""; 143 phandle_t chosen; 144 static struct { 145 cell_t name; 146 cell_t nargs; 147 cell_t nreturns; 148 cell_t bootspec; 149 } args = { 150 (cell_t)"boot", 151 1, 152 0, 153 (cell_t)bspec 154 }; 155 if ((chosen = OF_finddevice("/chosen")) != 0) { 156 if (OF_getprop(chosen, "bootpath", bspec, sizeof(bspec)) == -1) 157 bspec[0] = '\0'; 158 bspec[sizeof(bspec) - 1] = '\0'; 159 } 160 161 openfirmware_exit(&args); 162} 163 164/* 165 * Intercept the return address from a freshly forked process that has NOT 166 * been scheduled yet. 167 * 168 * This is needed to make kernel threads stay in kernel mode. 169 */ 170void 171cpu_set_fork_handler(struct thread *td, void (*func)(void *), void *arg) 172{ 173 struct frame *fp; 174 struct pcb *pcb; 175 176 pcb = td->td_pcb; 177 fp = (struct frame *)(pcb->pcb_fp + SPOFF); 178 fp->f_local[0] = (u_long)func; 179 fp->f_local[1] = (u_long)arg; 180} 181 182void 183cpu_wait(struct proc *p) 184{ 185} 186 187int 188is_physical_memory(vm_offset_t addr) 189{ 190 191 TODO; 192} 193 194void 195swi_vm(void *v) 196{ 197 TODO; 198} 199 200int 201vm_fault_quick(caddr_t v, int prot) 202{ 203 TODO; 204 return (0); 205} 206 207void 208vmapbuf(struct buf *bp) 209{ 210 TODO; 211} 212 213void 214vunmapbuf(struct buf *bp) 215{ 216 TODO; 217} 218