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) == 24);
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)
96 struct switchframe *sf;
99 if ((flags & RFPROC) == 0)
101 pcb2 = (struct pcb *)(td2->td_kstack + td2->td_kstack_pages * PAGE_SIZE) - 1;
103 #ifndef CPU_XSCALE_CORE3
104 pmap_use_minicache(td2->td_kstack, td2->td_kstack_pages * PAGE_SIZE);
108 bcopy(td1->td_pcb, pcb2, sizeof(*pcb2));
110 bcopy(&td1->td_proc->p_md, mdp2, sizeof(*mdp2));
111 pcb2->un_32.pcb32_sp = td2->td_kstack +
112 USPACE_SVC_STACK_TOP - sizeof(*pcb2);
113 pcb2->pcb_vfpcpu = -1;
114 pcb2->pcb_vfpstate.fpscr = VFPSCR_DN | VFPSCR_FZ;
116 td2->td_frame = tf = (struct trapframe *)STACKALIGN(
117 pcb2->un_32.pcb32_sp - sizeof(struct trapframe));
118 *tf = *td1->td_frame;
119 sf = (struct switchframe *)tf - 1;
120 sf->sf_r4 = (u_int)fork_return;
121 sf->sf_r5 = (u_int)td2;
122 sf->sf_pc = (u_int)fork_trampoline;
123 tf->tf_spsr &= ~PSR_C;
126 pcb2->un_32.pcb32_sp = (u_int)sf;
127 KASSERT((pcb2->un_32.pcb32_sp & 7) == 0,
128 ("cpu_fork: Incorrect stack alignment"));
130 /* Setup to release spin count in fork_exit(). */
131 td2->td_md.md_spinlock_count = 1;
132 td2->td_md.md_saved_cspr = 0;
133 #ifdef ARM_TP_ADDRESS
134 td2->td_md.md_tp = *(register_t *)ARM_TP_ADDRESS;
136 td2->td_md.md_tp = (register_t) get_tls();
141 cpu_thread_swapin(struct thread *td)
146 cpu_thread_swapout(struct thread *td)
151 cpu_set_syscall_retval(struct thread *td, int error)
153 struct trapframe *frame;
159 frame = td->td_frame;
164 * __syscall returns an off_t while most other syscalls return an
165 * int. As an off_t is 64-bits and an int is 32-bits we need to
166 * place the returned data into r1. As the lseek and frerebsd6_lseek
167 * syscalls also return an off_t they do not need this fixup.
172 call = *(u_int32_t *)(frame->tf_pc - INSN_SIZE) & 0x000fffff;
174 if (call == SYS___syscall) {
175 register_t *ap = &frame->tf_r0;
176 register_t code = ap[_QUAD_LOWWORD];
177 if (td->td_proc->p_sysent->sv_mask)
178 code &= td->td_proc->p_sysent->sv_mask;
179 fixup = (code != SYS_freebsd6_lseek && code != SYS_lseek)
188 frame->tf_r1 = td->td_retval[0];
190 frame->tf_r0 = td->td_retval[0];
191 frame->tf_r1 = td->td_retval[1];
193 frame->tf_spsr &= ~PSR_C; /* carry bit */
197 * Reconstruct the pc to point at the swi.
199 frame->tf_pc -= INSN_SIZE;
205 frame->tf_r0 = error;
206 frame->tf_spsr |= PSR_C; /* carry bit */
212 * Initialize machine state (pcb and trap frame) for a new thread about to
213 * upcall. Put enough state in the new thread's PCB to get it to go back
214 * userret(), where we can intercept it again to set the return (upcall)
215 * Address and stack, along with those from upcals that are from other sources
216 * such as those generated in thread_userret() itself.
219 cpu_set_upcall(struct thread *td, struct thread *td0)
221 struct trapframe *tf;
222 struct switchframe *sf;
224 bcopy(td0->td_frame, td->td_frame, sizeof(struct trapframe));
225 bcopy(td0->td_pcb, td->td_pcb, sizeof(struct pcb));
227 sf = (struct switchframe *)tf - 1;
228 sf->sf_r4 = (u_int)fork_return;
229 sf->sf_r5 = (u_int)td;
230 sf->sf_pc = (u_int)fork_trampoline;
231 tf->tf_spsr &= ~PSR_C;
233 td->td_pcb->un_32.pcb32_sp = (u_int)sf;
234 KASSERT((td->td_pcb->un_32.pcb32_sp & 7) == 0,
235 ("cpu_set_upcall: Incorrect stack alignment"));
237 /* Setup to release spin count in fork_exit(). */
238 td->td_md.md_spinlock_count = 1;
239 td->td_md.md_saved_cspr = 0;
243 * Set that machine state for performing an upcall that has to
244 * be done in thread_userret() so that those upcalls generated
245 * in thread_userret() itself can be done as well.
248 cpu_set_upcall_kse(struct thread *td, void (*entry)(void *), void *arg,
251 struct trapframe *tf = td->td_frame;
253 tf->tf_usr_sp = STACKALIGN((int)stack->ss_sp + stack->ss_size
254 - sizeof(struct trapframe));
255 tf->tf_pc = (int)entry;
256 tf->tf_r0 = (int)arg;
257 tf->tf_spsr = PSR_USR32_MODE;
261 cpu_set_user_tls(struct thread *td, void *tls_base)
264 td->td_md.md_tp = (register_t)tls_base;
265 if (td == curthread) {
267 #ifdef ARM_TP_ADDRESS
268 *(register_t *)ARM_TP_ADDRESS = (register_t)tls_base;
270 set_tls((void *)tls_base);
278 cpu_thread_exit(struct thread *td)
283 cpu_thread_alloc(struct thread *td)
285 td->td_pcb = (struct pcb *)(td->td_kstack + td->td_kstack_pages *
288 * Ensure td_frame is aligned to an 8 byte boundary as it will be
289 * placed into the stack pointer which must be 8 byte aligned in
292 td->td_frame = (struct trapframe *)STACKALIGN((u_int)td->td_kstack +
293 USPACE_SVC_STACK_TOP - sizeof(struct pcb) -
294 sizeof(struct trapframe));
296 #ifndef CPU_XSCALE_CORE3
297 pmap_use_minicache(td->td_kstack, td->td_kstack_pages * PAGE_SIZE);
303 cpu_thread_free(struct thread *td)
308 cpu_thread_clean(struct thread *td)
313 * Intercept the return address from a freshly forked process that has NOT
314 * been scheduled yet.
316 * This is needed to make kernel threads stay in kernel mode.
319 cpu_set_fork_handler(struct thread *td, void (*func)(void *), void *arg)
321 struct switchframe *sf;
322 struct trapframe *tf;
325 sf = (struct switchframe *)tf - 1;
326 sf->sf_r4 = (u_int)func;
327 sf->sf_r5 = (u_int)arg;
328 td->td_pcb->un_32.pcb32_sp = (u_int)sf;
329 KASSERT((td->td_pcb->un_32.pcb32_sp & 7) == 0,
330 ("cpu_set_fork_handler: Incorrect stack alignment"));
334 * Software interrupt handler for queued VM system processing.
340 if (busdma_swi_pending)
345 cpu_exit(struct thread *td)