2 * SPDX-License-Identifier: (BSD-4-Clause AND MIT-CMU)
4 * Copyright (c) 1982, 1986 The Regents of the University of California.
5 * Copyright (c) 1989, 1990 William Jolitz
6 * Copyright (c) 1994 John Dyson
9 * This code is derived from software contributed to Berkeley by
10 * the Systems Programming Group of the University of Utah Computer
11 * Science Department, and William Jolitz.
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. All advertising materials mentioning features or use of this software
22 * must display the following acknowledgement:
23 * This product includes software developed by the University of
24 * California, Berkeley and its contributors.
25 * 4. Neither the name of the University nor the names of its contributors
26 * may be used to endorse or promote products derived from this software
27 * without specific prior written permission.
29 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
30 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
31 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
32 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
33 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
34 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
35 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
37 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
38 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
41 * from: @(#)vm_machdep.c 7.3 (Berkeley) 5/13/91
42 * Utah $Hdr: vm_machdep.c 1.16.1.1 89/06/23$
46 * Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
47 * All rights reserved.
49 * Author: Chris G. Demetriou
51 * Permission to use, copy, modify and distribute this software and
52 * its documentation is hereby granted, provided that both the copyright
53 * notice and this permission notice appear in all copies of the
54 * software, derivative works or modified versions, and any portions
55 * thereof, and that both notices appear in supporting documentation.
57 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
58 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
59 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
61 * Carnegie Mellon requests users of this software to return to
63 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
64 * School of Computer Science
65 * Carnegie Mellon University
66 * Pittsburgh PA 15213-3890
68 * any improvements or extensions that they make and grant Carnegie the
69 * rights to redistribute these changes.
72 #include <sys/param.h>
73 #include <sys/systm.h>
75 #include <sys/malloc.h>
80 #include <sys/mutex.h>
81 #include <sys/vnode.h>
82 #include <sys/vmmeter.h>
83 #include <sys/kernel.h>
85 #include <sys/sysctl.h>
86 #include <sys/sysent.h>
87 #include <sys/unistd.h>
89 #include <machine/cpu.h>
90 #include <machine/fpu.h>
91 #include <machine/frame.h>
92 #include <machine/md_var.h>
93 #include <machine/pcb.h>
94 #include <machine/reg.h>
96 #include <dev/ofw/openfirm.h>
99 #include <vm/vm_param.h>
100 #include <vm/vm_kern.h>
101 #include <vm/vm_page.h>
102 #include <vm/vm_map.h>
103 #include <vm/vm_extern.h>
106 * Finish a fork operation, with process p2 nearly set up.
107 * Copy and update the pcb, set up the stack so that the child
108 * ready to run and return to user mode.
111 cpu_fork(struct thread *td1, struct proc *p2, struct thread *td2, int flags)
113 struct trapframe *tf;
114 struct callframe *cf;
117 KASSERT(td1 == curthread || td1 == &thread0,
118 ("cpu_fork: p1 not curproc and not proc0"));
119 CTR3(KTR_PROC, "cpu_fork: called td1=%p p2=%p flags=%x",
122 if ((flags & RFPROC) == 0)
125 /* Ensure td1 is up to date before copy. */
126 if (td1 == curthread)
127 cpu_save_thread_regs(td1);
129 pcb = (struct pcb *)((td2->td_kstack +
130 td2->td_kstack_pages * PAGE_SIZE - sizeof(struct pcb)) & ~0x2fUL);
134 bcopy(td1->td_pcb, pcb, sizeof(struct pcb));
137 * Create a fresh stack for the new process.
138 * Copy the trap frame for the return to user mode as if from a
139 * syscall. This copies most of the user mode register values.
141 tf = (struct trapframe *)pcb - 1;
142 bcopy(td1->td_frame, tf, sizeof(*tf));
144 /* Set up trap frame. */
145 tf->fixreg[FIRSTARG] = 0;
146 tf->fixreg[FIRSTARG + 1] = 0;
147 tf->cr &= ~0x10000000;
151 cf = (struct callframe *)tf - 1;
152 memset(cf, 0, sizeof(struct callframe));
153 #if defined(__powerpc64__) && (!defined(_CALL_ELF) || _CALL_ELF == 1)
154 cf->cf_toc = ((register_t *)fork_return)[1];
156 cf->cf_func = (register_t)fork_return;
157 cf->cf_arg0 = (register_t)td2;
158 cf->cf_arg1 = (register_t)tf;
160 pcb->pcb_sp = (register_t)cf;
161 KASSERT(pcb->pcb_sp % 16 == 0, ("stack misaligned"));
162 #if defined(__powerpc64__) && (!defined(_CALL_ELF) || _CALL_ELF == 1)
163 pcb->pcb_lr = ((register_t *)fork_trampoline)[0];
164 pcb->pcb_toc = ((register_t *)fork_trampoline)[1];
166 pcb->pcb_lr = (register_t)fork_trampoline;
167 pcb->pcb_context[0] = pcb->pcb_lr;
170 pcb->pcb_cpu.aim.usr_vsid = 0;
173 /* Setup to release spin count in fork_exit(). */
174 td2->td_md.md_spinlock_count = 1;
175 td2->td_md.md_saved_msr = psl_kernset;
178 * Now cpu_switch() can schedule the new process.
183 * Intercept the return address from a freshly forked process that has NOT
184 * been scheduled yet.
186 * This is needed to make kernel threads stay in kernel mode.
189 cpu_fork_kthread_handler(struct thread *td, void (*func)(void *), void *arg)
191 struct callframe *cf;
193 CTR4(KTR_PROC, "%s called with td=%p func=%p arg=%p",
194 __func__, td, func, arg);
196 cf = (struct callframe *)td->td_pcb->pcb_sp;
198 #if defined(__powerpc64__) && (!defined(_CALL_ELF) || _CALL_ELF == 1)
199 cf->cf_toc = ((register_t *)func)[1];
201 cf->cf_func = (register_t)func;
202 cf->cf_arg0 = (register_t)arg;
206 cpu_exit(struct thread *td)
212 * CPU threading functions related to the VM layer. These could be used
213 * to map the SLB bits required for the kernel stack instead of forcing a
218 cpu_thread_swapin(struct thread *td)
224 cpu_thread_swapout(struct thread *td)
230 cpu_exec_vmspace_reuse(struct proc *p __unused, vm_map_t map __unused)
237 cpu_procctl(struct thread *td __unused, int idtype __unused, id_t id __unused,
238 int com __unused, void *data __unused)