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 * All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * the Systems Programming Group of the University of Utah Computer 9 * Science Department, and William Jolitz. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the University of 22 * California, Berkeley and its contributors. 23 * 4. Neither the name of the University nor the names of its contributors 24 * may be used to endorse or promote products derived from this software 25 * without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 * 39 * from: @(#)vm_machdep.c 7.3 (Berkeley) 5/13/91 40 * Utah $Hdr: vm_machdep.c 1.16.1.1 89/06/23$ 41 * $FreeBSD$ 42 */ 43 /*- 44 * Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University. 45 * All rights reserved. 46 * 47 * Author: Chris G. Demetriou 48 * 49 * Permission to use, copy, modify and distribute this software and 50 * its documentation is hereby granted, provided that both the copyright 51 * notice and this permission notice appear in all copies of the 52 * software, derivative works or modified versions, and any portions 53 * thereof, and that both notices appear in supporting documentation. 54 * 55 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 56 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 57 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 58 * 59 * Carnegie Mellon requests users of this software to return to 60 * 61 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 62 * School of Computer Science 63 * Carnegie Mellon University 64 * Pittsburgh PA 15213-3890 65 * 66 * any improvements or extensions that they make and grant Carnegie the 67 * rights to redistribute these changes. 68 */ 69 70 #include <sys/param.h> 71 #include <sys/systm.h> 72 #include <sys/proc.h> 73 #include <sys/malloc.h> 74 #include <sys/bio.h> 75 #include <sys/buf.h> 76 #include <sys/ktr.h> 77 #include <sys/lock.h> 78 #include <sys/mutex.h> 79 #include <sys/vnode.h> 80 #include <sys/vmmeter.h> 81 #include <sys/kernel.h> 82 #include <sys/mbuf.h> 83 #include <sys/sysctl.h> 84 #include <sys/sysent.h> 85 #include <sys/unistd.h> 86 87 #include <machine/cpu.h> 88 #include <machine/fpu.h> 89 #include <machine/frame.h> 90 #include <machine/md_var.h> 91 #include <machine/pcb.h> 92 93 #include <dev/ofw/openfirm.h> 94 95 #include <vm/vm.h> 96 #include <vm/vm_param.h> 97 #include <vm/vm_kern.h> 98 #include <vm/vm_page.h> 99 #include <vm/vm_map.h> 100 #include <vm/vm_extern.h> 101 102 /* 103 * Finish a fork operation, with process p2 nearly set up. 104 * Copy and update the pcb, set up the stack so that the child 105 * ready to run and return to user mode. 106 */ 107 void 108 cpu_fork(struct thread *td1, struct proc *p2, struct thread *td2, int flags) 109 { 110 struct trapframe *tf; 111 struct callframe *cf; 112 struct pcb *pcb; 113 114 KASSERT(td1 == curthread || td1 == &thread0, 115 ("cpu_fork: p1 not curproc and not proc0")); 116 CTR3(KTR_PROC, "cpu_fork: called td1=%p p2=%p flags=%x", 117 td1, p2, flags); 118 119 if ((flags & RFPROC) == 0) 120 return; 121 122 pcb = (struct pcb *)((td2->td_kstack + 123 td2->td_kstack_pages * PAGE_SIZE - sizeof(struct pcb)) & ~0x2fUL); 124 td2->td_pcb = pcb; 125 126 /* Copy the pcb */ 127 bcopy(td1->td_pcb, pcb, sizeof(struct pcb)); 128 129 /* 130 * Create a fresh stack for the new process. 131 * Copy the trap frame for the return to user mode as if from a 132 * syscall. This copies most of the user mode register values. 133 */ 134 tf = (struct trapframe *)pcb - 1; 135 bcopy(td1->td_frame, tf, sizeof(*tf)); 136 137 /* Set up trap frame. */ 138 tf->fixreg[FIRSTARG] = 0; 139 tf->fixreg[FIRSTARG + 1] = 0; 140 tf->cr &= ~0x10000000; 141 142 td2->td_frame = tf; 143 144 cf = (struct callframe *)tf - 1; 145 memset(cf, 0, sizeof(struct callframe)); 146 #if defined(__powerpc64__) && (!defined(_CALL_ELF) || _CALL_ELF == 1) 147 cf->cf_toc = ((register_t *)fork_return)[1]; 148 #endif 149 cf->cf_func = (register_t)fork_return; 150 cf->cf_arg0 = (register_t)td2; 151 cf->cf_arg1 = (register_t)tf; 152 153 pcb->pcb_sp = (register_t)cf; 154 KASSERT(pcb->pcb_sp % 16 == 0, ("stack misaligned")); 155 #if defined(__powerpc64__) && (!defined(_CALL_ELF) || _CALL_ELF == 1) 156 pcb->pcb_lr = ((register_t *)fork_trampoline)[0]; 157 pcb->pcb_toc = ((register_t *)fork_trampoline)[1]; 158 #else 159 pcb->pcb_lr = (register_t)fork_trampoline; 160 pcb->pcb_context[0] = pcb->pcb_lr; 161 #endif 162 #ifdef AIM 163 pcb->pcb_cpu.aim.usr_vsid = 0; 164 #endif 165 166 /* Setup to release spin count in fork_exit(). */ 167 td2->td_md.md_spinlock_count = 1; 168 td2->td_md.md_saved_msr = PSL_KERNSET; 169 170 /* 171 * Now cpu_switch() can schedule the new process. 172 */ 173 } 174 175 /* 176 * Intercept the return address from a freshly forked process that has NOT 177 * been scheduled yet. 178 * 179 * This is needed to make kernel threads stay in kernel mode. 180 */ 181 void 182 cpu_fork_kthread_handler(struct thread *td, void (*func)(void *), void *arg) 183 { 184 struct callframe *cf; 185 186 CTR4(KTR_PROC, "%s called with td=%p func=%p arg=%p", 187 __func__, td, func, arg); 188 189 cf = (struct callframe *)td->td_pcb->pcb_sp; 190 191 cf->cf_func = (register_t)func; 192 cf->cf_arg0 = (register_t)arg; 193 } 194 195 void 196 cpu_exit(struct thread *td) 197 { 198 199 } 200 201 /* 202 * Software interrupt handler for queued VM system processing. 203 */ 204 void 205 swi_vm(void *dummy) 206 { 207 208 if (busdma_swi_pending != 0) 209 busdma_swi(); 210 } 211 212 /* 213 * Tell whether this address is in some physical memory region. 214 * Currently used by the kernel coredump code in order to avoid 215 * dumping the ``ISA memory hole'' which could cause indefinite hangs, 216 * or other unpredictable behaviour. 217 */ 218 int 219 is_physical_memory(vm_offset_t addr) 220 { 221 222 /* 223 * stuff other tests for known memory-mapped devices (PCI?) 224 * here 225 */ 226 return (1); 227 } 228 229 /* 230 * CPU threading functions related to the VM layer. These could be used 231 * to map the SLB bits required for the kernel stack instead of forcing a 232 * fixed-size KVA. 233 */ 234 235 void 236 cpu_thread_swapin(struct thread *td) 237 { 238 239 } 240 241 void 242 cpu_thread_swapout(struct thread *td) 243 { 244 245 } 246 247