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
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.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
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.
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
39 * from: @(#)vm_machdep.c 7.3 (Berkeley) 5/13/91
40 * Utah $Hdr: vm_machdep.c 1.16.1.1 89/06/23$
44 * Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
45 * All rights reserved.
47 * Author: Chris G. Demetriou
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.
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.
59 * Carnegie Mellon requests users of this software to return to
61 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
62 * School of Computer Science
63 * Carnegie Mellon University
64 * Pittsburgh PA 15213-3890
66 * any improvements or extensions that they make and grant Carnegie the
67 * rights to redistribute these changes.
70 #include <sys/param.h>
71 #include <sys/systm.h>
73 #include <sys/malloc.h>
78 #include <sys/mutex.h>
79 #include <sys/vnode.h>
80 #include <sys/vmmeter.h>
81 #include <sys/kernel.h>
83 #include <sys/sf_buf.h>
84 #include <sys/sysctl.h>
85 #include <sys/unistd.h>
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>
94 #include <dev/ofw/openfirm.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>
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.
109 cpu_fork(struct thread *td1, struct proc *p2, struct thread *td2, int flags)
112 struct trapframe *tf;
113 struct callframe *cf;
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);
120 if ((flags & RFPROC) == 0)
125 pcb = (struct pcb *)((td2->td_kstack +
126 td2->td_kstack_pages * PAGE_SIZE - sizeof(struct pcb)) & ~0x2fU);
130 bcopy(td1->td_pcb, pcb, sizeof(struct pcb));
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.
137 tf = (struct trapframe *)pcb - 1;
138 bcopy(td1->td_frame, tf, sizeof(*tf));
140 /* Set up trap frame. */
141 tf->fixreg[FIRSTARG] = 0;
142 tf->fixreg[FIRSTARG + 1] = 0;
143 tf->cr &= ~0x10000000;
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;
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];
157 /* Setup to release spin count in fork_exit(). */
158 td2->td_md.md_spinlock_count = 1;
159 td2->td_md.md_saved_msr = PSL_KERNSET;
162 * Now cpu_switch() can schedule the new process.
167 * Intercept the return address from a freshly forked process that has NOT
168 * been scheduled yet.
170 * This is needed to make kernel threads stay in kernel mode.
173 cpu_set_fork_handler(td, func, arg)
175 void (*func)(void *);
178 struct callframe *cf;
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);
183 cf = (struct callframe *)td->td_pcb->pcb_sp;
185 cf->cf_func = (register_t)func;
186 cf->cf_arg0 = (register_t)arg;
191 register struct thread *td;
195 /* Temporary helper */
197 cpu_throw(struct thread *old, struct thread *new)
200 cpu_switch(old, new, NULL);
201 panic("cpu_throw() didn't");
205 * Reset back to firmware.
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
219 sf_buf_alloc(struct vm_page *m, int pri)
222 return ((struct sf_buf *)m);
226 * Free the sf_buf. In fact, do nothing because there are no resources
227 * associated with the sf_buf.
230 sf_buf_free(struct sf_buf *sf)
235 * Software interrupt handler for queued VM system processing.
240 #if 0 /* XXX: Don't have busdma stuff yet */
241 if (busdma_swi_pending != 0)
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.
255 is_physical_memory(addr)
259 * stuff other tests for known memory-mapped devices (PCI?)
270 cpu_thread_exit(struct thread *td)
275 cpu_thread_clean(struct thread *td)
280 cpu_thread_alloc(struct thread *td)
284 pcb = (struct pcb *)((td->td_kstack + td->td_kstack_pages * PAGE_SIZE -
285 sizeof(struct pcb)) & ~0x2fU);
287 td->td_frame = (struct trapframe *)pcb - 1;
291 cpu_thread_free(struct thread *td)
296 cpu_thread_swapin(struct thread *td)
301 cpu_thread_swapout(struct thread *td)
306 cpu_set_upcall(struct thread *td, struct thread *td0)
309 struct trapframe *tf;
310 struct callframe *cf;
314 /* Copy the upcall pcb */
315 bcopy(td0->td_pcb, pcb2, sizeof(*pcb2));
317 /* Create a stack for the new thread */
319 bcopy(td0->td_frame, tf, sizeof(struct trapframe));
320 tf->fixreg[FIRSTARG] = 0;
321 tf->fixreg[FIRSTARG + 1] = 0;
322 tf->cr &= ~0x10000000;
324 /* Set registers for trampoline to user mode. */
325 cf = (struct callframe *)tf - 1;
326 memset(cf, 0, sizeof(struct callframe));
327 cf->cf_func = (register_t)fork_return;
328 cf->cf_arg0 = (register_t)td;
329 cf->cf_arg1 = (register_t)tf;
331 pcb2->pcb_sp = (register_t)cf;
332 pcb2->pcb_lr = (register_t)fork_trampoline;
333 pcb2->pcb_usr = kernel_pmap->pm_sr[USER_SR];
335 /* Setup to release spin count in fork_exit(). */
336 td->td_md.md_spinlock_count = 1;
337 td->td_md.md_saved_msr = PSL_KERNSET;
341 cpu_set_upcall_kse(struct thread *td, void (*entry)(void *), void *arg,
344 struct trapframe *tf;
348 /* align stack and alloc space for frame ptr and saved LR */
349 sp = ((uint32_t)stack->ss_sp + stack->ss_size
350 - 2*sizeof(u_int32_t)) & ~0x1f;
351 bzero(tf, sizeof(struct trapframe));
353 tf->fixreg[1] = (register_t)sp;
354 tf->fixreg[3] = (register_t)arg;
355 tf->srr0 = (register_t)entry;
356 tf->srr1 = PSL_MBO | PSL_USERSET | PSL_FE_DFLT;
357 td->td_pcb->pcb_flags = 0;
359 td->td_retval[0] = (register_t)entry;
360 td->td_retval[1] = 0;
364 cpu_set_user_tls(struct thread *td, void *tls_base)
367 td->td_frame->fixreg[2] = (register_t)tls_base + 0x7008;