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: releng/6.3/sys/powerpc/powerpc/vm_machdep.c 161848 2006-09-01 22:32:33Z 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/clock.h>
88 #include <machine/cpu.h>
89 #include <machine/fpu.h>
90 #include <machine/frame.h>
91 #include <machine/md_var.h>
92 #include <machine/pcb.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 */
108 void
109 cpu_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 */
172 void
173 cpu_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
189 void
190 cpu_exit(td)
191 register struct thread *td;
192 {
193 }
194
195 /* Temporary helper */
196 void
197 cpu_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 */
207 void
208 cpu_reset()
209 {
210 OF_exit();
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 */
218 struct sf_buf *
219 sf_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 */
229 void
230 sf_buf_free(struct sf_buf *sf)
231 {
232 }
233
234 /*
235 * Software interrupt handler for queued VM system processing.
236 */
237 void
238 swi_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
254 int
255 is_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 */
269 void
270 cpu_thread_exit(struct thread *td)
271 {
272 }
273
274 void
275 cpu_thread_clean(struct thread *td)
276 {
277 }
278
279 void
280 cpu_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
290 void
291 cpu_thread_swapin(struct thread *td)
292 {
293 }
294
295 void
296 cpu_thread_swapout(struct thread *td)
297 {
298 }
299
300 void
301 cpu_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
335 void
336 cpu_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
358 int
359 cpu_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 }
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