vm_machdep.c revision 165608
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: head/sys/powerpc/aim/vm_machdep.c 165608 2006-12-28 23:56:50Z marcel $ 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/sf_buf.h> 84#include <sys/sysctl.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#include <machine/powerpc.h> 93 94#include <dev/ofw/openfirm.h> 95 96#include <vm/vm.h> 97#include <vm/vm_param.h> 98#include <vm/vm_kern.h> 99#include <vm/vm_page.h> 100#include <vm/vm_map.h> 101#include <vm/vm_extern.h> 102 103/* 104 * Finish a fork operation, with process p2 nearly set up. 105 * Copy and update the pcb, set up the stack so that the child 106 * ready to run and return to user mode. 107 */ 108void 109cpu_fork(struct thread *td1, struct proc *p2, struct thread *td2, int flags) 110{ 111 struct proc *p1; 112 struct trapframe *tf; 113 struct callframe *cf; 114 struct pcb *pcb; 115 116 KASSERT(td1 == curthread || td1 == &thread0, 117 ("cpu_fork: p1 not curproc and not proc0")); 118 CTR3(KTR_PROC, "cpu_fork: called td1=%08x p2=%08x flags=%x", (u_int)td1, (u_int)p2, flags); 119 120 if ((flags & RFPROC) == 0) 121 return; 122 123 p1 = td1->td_proc; 124 125 pcb = (struct pcb *)((td2->td_kstack + 126 td2->td_kstack_pages * PAGE_SIZE - sizeof(struct pcb)) & ~0x2fU); 127 td2->td_pcb = pcb; 128 129 /* Copy the pcb */ 130 bcopy(td1->td_pcb, pcb, sizeof(struct pcb)); 131 132 /* 133 * Create a fresh stack for the new process. 134 * Copy the trap frame for the return to user mode as if from a 135 * syscall. This copies most of the user mode register values. 136 */ 137 tf = (struct trapframe *)pcb - 1; 138 bcopy(td1->td_frame, tf, sizeof(*tf)); 139 140 /* Set up trap frame. */ 141 tf->fixreg[FIRSTARG] = 0; 142 tf->fixreg[FIRSTARG + 1] = 0; 143 tf->cr &= ~0x10000000; 144 145 td2->td_frame = tf; 146 147 cf = (struct callframe *)tf - 1; 148 memset(cf, 0, sizeof(struct callframe)); 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 pcb->pcb_lr = (register_t)fork_trampoline; 155 pcb->pcb_usr = kernel_pmap->pm_sr[USER_SR]; 156 157 /* Setup to release sched_lock in fork_exit(). */ 158 td2->td_md.md_spinlock_count = 1; 159 td2->td_md.md_saved_msr = PSL_KERNSET; 160 161 /* 162 * Now cpu_switch() can schedule the new process. 163 */ 164} 165 166/* 167 * Intercept the return address from a freshly forked process that has NOT 168 * been scheduled yet. 169 * 170 * This is needed to make kernel threads stay in kernel mode. 171 */ 172void 173cpu_set_fork_handler(td, func, arg) 174 struct thread *td; 175 void (*func)(void *); 176 void *arg; 177{ 178 struct callframe *cf; 179 180 CTR3(KTR_PROC, "cpu_set_fork_handler: called with td=%08x func=%08x arg=%08x", 181 (u_int)td, (u_int)func, (u_int)arg); 182 183 cf = (struct callframe *)td->td_pcb->pcb_sp; 184 185 cf->cf_func = (register_t)func; 186 cf->cf_arg0 = (register_t)arg; 187} 188 189void 190cpu_exit(td) 191 register struct thread *td; 192{ 193} 194 195/* Temporary helper */ 196void 197cpu_throw(struct thread *old, struct thread *new) 198{ 199 200 cpu_switch(old, new); 201 panic("cpu_throw() didn't"); 202} 203 204/* 205 * Reset back to firmware. 206 */ 207void 208cpu_reset() 209{ 210 OF_reboot(); 211} 212 213/* 214 * Allocate an sf_buf for the given vm_page. On this machine, however, there 215 * is no sf_buf object. Instead, an opaque pointer to the given vm_page is 216 * returned. 217 */ 218struct sf_buf * 219sf_buf_alloc(struct vm_page *m, int pri) 220{ 221 222 return ((struct sf_buf *)m); 223} 224 225/* 226 * Free the sf_buf. In fact, do nothing because there are no resources 227 * associated with the sf_buf. 228 */ 229void 230sf_buf_free(struct sf_buf *sf) 231{ 232} 233 234/* 235 * Software interrupt handler for queued VM system processing. 236 */ 237void 238swi_vm(void *dummy) 239{ 240#if 0 /* XXX: Don't have busdma stuff yet */ 241 if (busdma_swi_pending != 0) 242 busdma_swi(); 243#endif 244} 245 246/* 247 * Tell whether this address is in some physical memory region. 248 * Currently used by the kernel coredump code in order to avoid 249 * dumping the ``ISA memory hole'' which could cause indefinite hangs, 250 * or other unpredictable behaviour. 251 */ 252 253 254int 255is_physical_memory(addr) 256 vm_offset_t addr; 257{ 258 /* 259 * stuff other tests for known memory-mapped devices (PCI?) 260 * here 261 */ 262 263 return 1; 264} 265 266/* 267 * KSE functions 268 */ 269void 270cpu_thread_exit(struct thread *td) 271{ 272} 273 274void 275cpu_thread_clean(struct thread *td) 276{ 277} 278 279void 280cpu_thread_setup(struct thread *td) 281{ 282 struct pcb *pcb; 283 284 pcb = (struct pcb *)((td->td_kstack + td->td_kstack_pages * PAGE_SIZE - 285 sizeof(struct pcb)) & ~0x2fU); 286 td->td_pcb = pcb; 287 td->td_frame = (struct trapframe *)pcb - 1; 288} 289 290void 291cpu_thread_swapin(struct thread *td) 292{ 293} 294 295void 296cpu_thread_swapout(struct thread *td) 297{ 298} 299 300void 301cpu_set_upcall(struct thread *td, struct thread *td0) 302{ 303 struct pcb *pcb2; 304 struct trapframe *tf; 305 struct callframe *cf; 306 307 pcb2 = td->td_pcb; 308 309 /* Copy the upcall pcb */ 310 bcopy(td0->td_pcb, pcb2, sizeof(*pcb2)); 311 312 /* Create a stack for the new thread */ 313 tf = td->td_frame; 314 bcopy(td0->td_frame, tf, sizeof(struct trapframe)); 315 tf->fixreg[FIRSTARG] = 0; 316 tf->fixreg[FIRSTARG + 1] = 0; 317 tf->cr &= ~0x10000000; 318 319 /* Set registers for trampoline to user mode. */ 320 cf = (struct callframe *)tf - 1; 321 memset(cf, 0, sizeof(struct callframe)); 322 cf->cf_func = (register_t)fork_return; 323 cf->cf_arg0 = (register_t)td; 324 cf->cf_arg1 = (register_t)tf; 325 326 pcb2->pcb_sp = (register_t)cf; 327 pcb2->pcb_lr = (register_t)fork_trampoline; 328 pcb2->pcb_usr = kernel_pmap->pm_sr[USER_SR]; 329 330 /* Setup to release sched_lock in fork_exit(). */ 331 td->td_md.md_spinlock_count = 1; 332 td->td_md.md_saved_msr = PSL_KERNSET; 333} 334 335void 336cpu_set_upcall_kse(struct thread *td, void (*entry)(void *), void *arg, 337 stack_t *stack) 338{ 339 struct trapframe *tf; 340 uint32_t sp; 341 342 tf = td->td_frame; 343 /* align stack and alloc space for frame ptr and saved LR */ 344 sp = ((uint32_t)stack->ss_sp + stack->ss_size 345 - 2*sizeof(u_int32_t)) & ~0x1f; 346 bzero(tf, sizeof(struct trapframe)); 347 348 tf->fixreg[1] = (register_t)sp; 349 tf->fixreg[3] = (register_t)arg; 350 tf->srr0 = (register_t)entry; 351 tf->srr1 = PSL_MBO | PSL_USERSET | PSL_FE_DFLT; 352 td->td_pcb->pcb_flags = 0; 353 354 td->td_retval[0] = (register_t)entry; 355 td->td_retval[1] = 0; 356} 357 358int 359cpu_set_user_tls(struct thread *td, void *tls_base) 360{ 361 362 td->td_frame->fixreg[2] = (register_t)tls_base + 0x7008; 363 return (0); 364} 365