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 $Hdr: vm_machdep.c 1.16.1.1 89/06/23$
43 #include <sys/cdefs.h>
44 __FBSDID("$FreeBSD$");
46 #include <sys/param.h>
47 #include <sys/systm.h>
48 #include <sys/kernel.h>
49 #include <sys/malloc.h>
52 #include <sys/socketvar.h>
53 #include <sys/syscall.h>
54 #include <sys/sysctl.h>
55 #include <sys/sysent.h>
56 #include <sys/unistd.h>
57 #include <machine/cpu.h>
58 #include <machine/frame.h>
59 #include <machine/pcb.h>
60 #include <machine/sysarch.h>
62 #include <sys/mutex.h>
66 #include <vm/vm_extern.h>
67 #include <vm/vm_kern.h>
68 #include <vm/vm_page.h>
69 #include <vm/vm_map.h>
70 #include <vm/vm_param.h>
71 #include <vm/vm_pageout.h>
73 #include <vm/uma_int.h>
75 #include <machine/md_var.h>
76 #include <machine/vfp.h>
79 * struct switchframe and trapframe must both be a multiple of 8
80 * for correct stack alignment.
82 CTASSERT(sizeof(struct switchframe) == 48);
83 CTASSERT(sizeof(struct trapframe) == 80);
86 * Finish a fork operation, with process p2 nearly set up.
87 * Copy and update the pcb, set up the stack so that the child
88 * ready to run and return to user mode.
91 cpu_fork(register struct thread *td1, register struct proc *p2,
92 struct thread *td2, int flags)
98 if ((flags & RFPROC) == 0)
101 /* Point the pcb to the top of the stack */
102 pcb2 = (struct pcb *)
103 (td2->td_kstack + td2->td_kstack_pages * PAGE_SIZE) - 1;
105 #ifndef CPU_XSCALE_CORE3
106 pmap_use_minicache(td2->td_kstack, td2->td_kstack_pages * PAGE_SIZE);
111 /* Clone td1's pcb */
112 bcopy(td1->td_pcb, pcb2, sizeof(*pcb2));
114 /* Point to mdproc and then copy over td1's contents */
116 bcopy(&td1->td_proc->p_md, mdp2, sizeof(*mdp2));
118 /* Point the frame to the stack in front of pcb and copy td1's frame */
119 td2->td_frame = (struct trapframe *)pcb2 - 1;
120 *td2->td_frame = *td1->td_frame;
123 * Create a new fresh stack for the new process.
124 * Copy the trap frame for the return to user mode as if from a
125 * syscall. This copies most of the user mode register values.
127 pmap_set_pcb_pagedir(vmspace_pmap(p2->p_vmspace), pcb2);
128 pcb2->pcb_regs.sf_r4 = (register_t)fork_return;
129 pcb2->pcb_regs.sf_r5 = (register_t)td2;
130 pcb2->pcb_regs.sf_lr = (register_t)fork_trampoline;
131 pcb2->pcb_regs.sf_sp = STACKALIGN(td2->td_frame);
133 pcb2->pcb_vfpcpu = -1;
134 pcb2->pcb_vfpstate.fpscr = VFPSCR_DN | VFPSCR_FZ;
137 tf->tf_spsr &= ~PSR_C;
142 /* Setup to release spin count in fork_exit(). */
143 td2->td_md.md_spinlock_count = 1;
144 td2->td_md.md_saved_cspr = PSR_SVC32_MODE;;
145 #ifdef ARM_TP_ADDRESS
146 td2->td_md.md_tp = *(register_t *)ARM_TP_ADDRESS;
148 td2->td_md.md_tp = (register_t) get_tls();
153 cpu_thread_swapin(struct thread *td)
158 cpu_thread_swapout(struct thread *td)
163 cpu_set_syscall_retval(struct thread *td, int error)
165 struct trapframe *frame;
171 frame = td->td_frame;
176 * __syscall returns an off_t while most other syscalls return an
177 * int. As an off_t is 64-bits and an int is 32-bits we need to
178 * place the returned data into r1. As the lseek and frerebsd6_lseek
179 * syscalls also return an off_t they do not need this fixup.
184 call = *(u_int32_t *)(frame->tf_pc - INSN_SIZE) & 0x000fffff;
186 if (call == SYS___syscall) {
187 register_t *ap = &frame->tf_r0;
188 register_t code = ap[_QUAD_LOWWORD];
189 if (td->td_proc->p_sysent->sv_mask)
190 code &= td->td_proc->p_sysent->sv_mask;
191 fixup = (code != SYS_freebsd6_lseek && code != SYS_lseek)
200 frame->tf_r1 = td->td_retval[0];
202 frame->tf_r0 = td->td_retval[0];
203 frame->tf_r1 = td->td_retval[1];
205 frame->tf_spsr &= ~PSR_C; /* carry bit */
209 * Reconstruct the pc to point at the swi.
211 frame->tf_pc -= INSN_SIZE;
217 frame->tf_r0 = error;
218 frame->tf_spsr |= PSR_C; /* carry bit */
224 * Initialize machine state (pcb and trap frame) for a new thread about to
225 * upcall. Put enough state in the new thread's PCB to get it to go back
226 * userret(), where we can intercept it again to set the return (upcall)
227 * Address and stack, along with those from upcals that are from other sources
228 * such as those generated in thread_userret() itself.
231 cpu_set_upcall(struct thread *td, struct thread *td0)
234 bcopy(td0->td_frame, td->td_frame, sizeof(struct trapframe));
235 bcopy(td0->td_pcb, td->td_pcb, sizeof(struct pcb));
237 td->td_pcb->pcb_regs.sf_r4 = (register_t)fork_return;
238 td->td_pcb->pcb_regs.sf_r5 = (register_t)td;
239 td->td_pcb->pcb_regs.sf_lr = (register_t)fork_trampoline;
240 td->td_pcb->pcb_regs.sf_sp = STACKALIGN(td->td_frame);
242 td->td_frame->tf_spsr &= ~PSR_C;
243 td->td_frame->tf_r0 = 0;
245 /* Setup to release spin count in fork_exit(). */
246 td->td_md.md_spinlock_count = 1;
247 td->td_md.md_saved_cspr = PSR_SVC32_MODE;
251 * Set that machine state for performing an upcall that has to
252 * be done in thread_userret() so that those upcalls generated
253 * in thread_userret() itself can be done as well.
256 cpu_set_upcall_kse(struct thread *td, void (*entry)(void *), void *arg,
259 struct trapframe *tf = td->td_frame;
261 tf->tf_usr_sp = STACKALIGN((int)stack->ss_sp + stack->ss_size);
262 tf->tf_pc = (int)entry;
263 tf->tf_r0 = (int)arg;
264 tf->tf_spsr = PSR_USR32_MODE;
268 cpu_set_user_tls(struct thread *td, void *tls_base)
271 td->td_md.md_tp = (register_t)tls_base;
272 if (td == curthread) {
274 #ifdef ARM_TP_ADDRESS
275 *(register_t *)ARM_TP_ADDRESS = (register_t)tls_base;
277 set_tls((void *)tls_base);
285 cpu_thread_exit(struct thread *td)
290 cpu_thread_alloc(struct thread *td)
292 td->td_pcb = (struct pcb *)(td->td_kstack + td->td_kstack_pages *
295 * Ensure td_frame is aligned to an 8 byte boundary as it will be
296 * placed into the stack pointer which must be 8 byte aligned in
299 td->td_frame = (struct trapframe *)((caddr_t)td->td_pcb) - 1;
302 #ifndef CPU_XSCALE_CORE3
303 pmap_use_minicache(td->td_kstack, td->td_kstack_pages * PAGE_SIZE);
309 cpu_thread_free(struct thread *td)
314 cpu_thread_clean(struct thread *td)
319 * Intercept the return address from a freshly forked process that has NOT
320 * been scheduled yet.
322 * This is needed to make kernel threads stay in kernel mode.
325 cpu_set_fork_handler(struct thread *td, void (*func)(void *), void *arg)
327 td->td_pcb->pcb_regs.sf_r4 = (register_t)func; /* function */
328 td->td_pcb->pcb_regs.sf_r5 = (register_t)arg; /* first arg */
332 * Software interrupt handler for queued VM system processing.
338 if (busdma_swi_pending)
343 cpu_exit(struct thread *td)