dsched - Periph.: call dsched_exit on thread exit
[dragonfly.git] / sys / platform / vkernel64 / x86_64 / vm_machdep.c
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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 * Copyright (c) 2008 The DragonFly Project.
6 * All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley by
9 * the Systems Programming Group of the University of Utah Computer
10 * Science Department, and William Jolitz.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. All advertising materials mentioning features or use of this software
21 * must display the following acknowledgement:
22 * This product includes software developed by the University of
23 * California, Berkeley and its contributors.
24 * 4. Neither the name of the University nor the names of its contributors
25 * may be used to endorse or promote products derived from this software
26 * without specific prior written permission.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * SUCH DAMAGE.
39 *
40 * from: @(#)vm_machdep.c 7.3 (Berkeley) 5/13/91
41 * Utah $Hdr: vm_machdep.c 1.16.1.1 89/06/23$
42 * $FreeBSD: src/sys/i386/i386/vm_machdep.c,v 1.132.2.9 2003/01/25 19:02:23 dillon Exp $
43 * $DragonFly: src/sys/platform/pc64/amd64/vm_machdep.c,v 1.3 2008/08/29 17:07:10 dillon Exp $
44 */
45
46#include <sys/param.h>
47#include <sys/systm.h>
48#include <sys/malloc.h>
49#include <sys/proc.h>
50#include <sys/buf.h>
51#include <sys/interrupt.h>
52#include <sys/vnode.h>
53#include <sys/vmmeter.h>
54#include <sys/kernel.h>
55#include <sys/sysctl.h>
56#include <sys/unistd.h>
f8abf63c 57#include <sys/dsched.h>
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58
59#include <machine/clock.h>
60#include <machine/cpu.h>
61#include <machine/md_var.h>
62#include <machine/smp.h>
63#include <machine/pcb.h>
64#include <machine/pcb_ext.h>
65#include <machine/segments.h>
66#include <machine/globaldata.h> /* npxthread */
67
68#include <vm/vm.h>
69#include <vm/vm_param.h>
70#include <sys/lock.h>
71#include <vm/vm_kern.h>
72#include <vm/vm_page.h>
73#include <vm/vm_map.h>
74#include <vm/vm_extern.h>
75
76#include <sys/thread2.h>
77
78#include <bus/isa/isa.h>
79
80char machine[] = MACHINE;
81SYSCTL_STRING(_hw, HW_MACHINE, machine, CTLFLAG_RD,
82 machine, 0, "Machine class");
83
84/*
85 * Finish a fork operation, with lwp lp2 nearly set up.
86 * Copy and update the pcb, set up the stack so that the child
87 * ready to run and return to user mode.
88 */
89void
90cpu_fork(struct lwp *lp1, struct lwp *lp2, int flags)
91{
92 struct pcb *pcb2;
93
94 if ((flags & RFPROC) == 0) {
95 if ((flags & RFMEM) == 0) {
96 /* unshare user LDT */
97 struct pcb *pcb1 = lp1->lwp_thread->td_pcb;
98 struct pcb_ldt *pcb_ldt = pcb1->pcb_ldt;
99 if (pcb_ldt && pcb_ldt->ldt_refcnt > 1) {
100 pcb_ldt = user_ldt_alloc(pcb1,pcb_ldt->ldt_len);
101 user_ldt_free(pcb1);
102 pcb1->pcb_ldt = pcb_ldt;
103 set_user_ldt(pcb1);
104 }
105 }
106 return;
107 }
108
109 /* Ensure that lp1's pcb is up to date. */
110 if (mdcpu->gd_npxthread == lp1->lwp_thread)
111 npxsave(lp1->lwp_thread->td_savefpu);
112
113 /*
114 * Copy lp1's PCB. This really only applies to the
115 * debug registers and FP state, but its faster to just copy the
116 * whole thing. Because we only save the PCB at switchout time,
117 * the register state may not be current.
118 */
119 pcb2 = lp2->lwp_thread->td_pcb;
120 *pcb2 = *lp1->lwp_thread->td_pcb;
121
122 /*
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 the user mode register values.
126 *
127 * pcb_rsp must allocate an additional call-return pointer below
128 * the trap frame which will be restored by cpu_heavy_restore from
129 * PCB_RIP, and the thread's td_sp pointer must allocate an
130 * additonal two quadwords below the pcb_rsp call-return pointer to
131 * hold the LWKT restore function pointer and rflags.
132 *
133 * The LWKT restore function pointer must be set to cpu_heavy_restore,
134 * which is our standard heavy-weight process switch-in function.
135 * YYY eventually we should shortcut fork_return and fork_trampoline
136 * to use the LWKT restore function directly so we can get rid of
137 * all the extra crap we are setting up.
138 */
139 lp2->lwp_md.md_regs = (struct trapframe *)pcb2 - 1;
140 bcopy(lp1->lwp_md.md_regs, lp2->lwp_md.md_regs, sizeof(*lp2->lwp_md.md_regs));
141
142 /*
143 * Set registers for trampoline to user mode. Leave space for the
144 * return address on stack. These are the kernel mode register values.
145 */
146 pcb2->pcb_unused01 = 0;
147 pcb2->pcb_rbx = (unsigned long)fork_return; /* fork_trampoline argument */
148 pcb2->pcb_rbp = 0;
149 pcb2->pcb_rsp = (unsigned long)lp2->lwp_md.md_regs - sizeof(void *);
150 pcb2->pcb_r12 = (unsigned long)lp2; /* fork_trampoline argument */
151 pcb2->pcb_r13 = 0;
152 pcb2->pcb_r14 = 0;
153 pcb2->pcb_r15 = 0;
154 pcb2->pcb_rip = (unsigned long)fork_trampoline;
155 lp2->lwp_thread->td_sp = (char *)(pcb2->pcb_rsp - sizeof(void *));
156 *(u_int64_t *)lp2->lwp_thread->td_sp = PSL_USER;
157 lp2->lwp_thread->td_sp -= sizeof(void *);
158 *(void **)lp2->lwp_thread->td_sp = (void *)cpu_heavy_restore;
159
160 /*
161 * pcb2->pcb_ldt: duplicated below, if necessary.
162 * pcb2->pcb_savefpu: cloned above.
163 * pcb2->pcb_flags: cloned above (always 0 here?).
164 * pcb2->pcb_onfault: cloned above (always NULL here?).
165 */
166
167 /*
168 * XXX don't copy the i/o pages. this should probably be fixed.
169 */
170 pcb2->pcb_ext = 0;
171
172 /* Copy the LDT, if necessary. */
173 if (pcb2->pcb_ldt != 0) {
174 if (flags & RFMEM) {
175 pcb2->pcb_ldt->ldt_refcnt++;
176 } else {
177 pcb2->pcb_ldt = user_ldt_alloc(pcb2,
178 pcb2->pcb_ldt->ldt_len);
179 }
180 }
181 bcopy(&lp1->lwp_thread->td_tls, &lp2->lwp_thread->td_tls,
182 sizeof(lp2->lwp_thread->td_tls));
183 /*
184 * Now, cpu_switch() can schedule the new lwp.
185 * pcb_rsp is loaded pointing to the cpu_switch() stack frame
186 * containing the return address when exiting cpu_switch.
187 * This will normally be to fork_trampoline(), which will have
188 * %rbx loaded with the new lwp's pointer. fork_trampoline()
189 * will set up a stack to call fork_return(lp, frame); to complete
190 * the return to user-mode.
191 */
192}
193
194/*
195 * Prepare new lwp to return to the address specified in params.
196 */
197int
198cpu_prepare_lwp(struct lwp *lp, struct lwp_params *params)
199{
200 struct trapframe *regs = lp->lwp_md.md_regs;
201 void *bad_return = NULL;
202 int error;
203
204 regs->tf_rip = (long)params->func;
205 regs->tf_rsp = (long)params->stack;
206 /* Set up argument for function call */
207 regs->tf_rdi = (long)params->arg; /* JG Can this be in userspace addresses? */
208 /*
209 * Set up fake return address. As the lwp function may never return,
210 * we simply copy out a NULL pointer and force the lwp to receive
211 * a SIGSEGV if it returns anyways.
212 */
213 regs->tf_rsp -= sizeof(void *);
214 error = copyout(&bad_return, (void *)regs->tf_rsp, sizeof(bad_return));
215 if (error)
216 return (error);
217
218 cpu_set_fork_handler(lp,
219 (void (*)(void *, struct trapframe *))generic_lwp_return, lp);
220 return (0);
221}
222
223/*
224 * Intercept the return address from a freshly forked process that has NOT
225 * been scheduled yet.
226 *
227 * This is needed to make kernel threads stay in kernel mode.
228 */
229void
230cpu_set_fork_handler(struct lwp *lp, void (*func)(void *, struct trapframe *),
231 void *arg)
232{
233 /*
234 * Note that the trap frame follows the args, so the function
235 * is really called like this: func(arg, frame);
236 */
237 lp->lwp_thread->td_pcb->pcb_rbx = (long)func; /* function */
238 lp->lwp_thread->td_pcb->pcb_r12 = (long)arg; /* first arg */
239}
240
241void
242cpu_set_thread_handler(thread_t td, void (*rfunc)(void), void *func, void *arg)
243{
244 td->td_pcb->pcb_rbx = (long)func;
245 td->td_pcb->pcb_r12 = (long)arg;
246 td->td_switch = cpu_lwkt_switch;
247 td->td_sp -= sizeof(void *);
248 *(void **)td->td_sp = rfunc; /* exit function on return */
249 td->td_sp -= sizeof(void *);
250 *(void **)td->td_sp = cpu_kthread_restore;
251}
252
253void
254cpu_lwp_exit(void)
255{
256 struct thread *td = curthread;
257 struct pcb *pcb;
258 npxexit();
259 pcb = td->td_pcb;
260 KKASSERT(pcb->pcb_ext == NULL); /* Some i386 functionality was dropped */
261 if (pcb->pcb_flags & PCB_DBREGS) {
262 /*
263 * disable all hardware breakpoints
264 */
265 reset_dbregs();
266 pcb->pcb_flags &= ~PCB_DBREGS;
267 }
268 td->td_gd->gd_cnt.v_swtch++;
269
f8abf63c 270 dsched_exit_thread(td);
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271 crit_enter_quick(td);
272 lwkt_deschedule_self(td);
273 lwkt_remove_tdallq(td);
274 cpu_thread_exit();
275}
276
277/*
278 * Terminate the current thread. The caller must have already acquired
279 * the thread's rwlock and placed it on a reap list or otherwise notified
280 * a reaper of its existance. We set a special assembly switch function which
281 * releases td_rwlock after it has cleaned up the MMU state and switched
282 * out the stack.
283 *
284 * Must be caller from a critical section and with the thread descheduled.
285 */
286void
287cpu_thread_exit(void)
288{
289 curthread->td_switch = cpu_exit_switch;
290 curthread->td_flags |= TDF_EXITING;
291 lwkt_switch();
292 panic("cpu_thread_exit: lwkt_switch() unexpectedly returned");
293}
294
295/*
296 * Process Reaper. Called after the caller has acquired the thread's
297 * rwlock and removed it from the reap list.
298 */
299void
300cpu_proc_wait(struct proc *p)
301{
302 /* drop per-process resources */
303 pmap_dispose_proc(p);
304}
305
306int
307grow_stack(struct proc *p, u_long sp)
308{
309 int rv;
310
311 rv = vm_map_growstack (p, sp);
312 if (rv != KERN_SUCCESS)
313 return (0);
314
315 return (1);
316}
317
318/*
319 * Tell whether this address is in some physical memory region.
320 * Currently used by the kernel coredump code in order to avoid
321 * dumping the ``ISA memory hole'' which could cause indefinite hangs,
322 * or other unpredictable behaviour.
323 */
324
325int
326is_physical_memory(vm_offset_t addr)
327{
328 return 1;
329}
330
331/*
332 * Used by /dev/kmem to determine if we can safely read or write
333 * the requested KVA range. Some portions of kernel memory are
334 * not governed by our virtual page table.
335 */
336extern int64_t _end;
337extern void _start(void);
338
339int
340kvm_access_check(vm_offset_t saddr, vm_offset_t eaddr, int prot)
341{
342 vm_offset_t addr;
343
344 if (saddr >= trunc_page((vm_offset_t)&_start) && eaddr <= round_page((vm_offset_t)&_end))
345 return 0;
346 if (saddr < KvaStart)
347 return EFAULT;
348 if (eaddr >= KvaEnd)
349 return EFAULT;
350 for (addr = saddr; addr < eaddr; addr += PAGE_SIZE) {
351 if (pmap_extract(&kernel_pmap, addr) == 0)
352 return EFAULT;
353 }
354 if (!kernacc((caddr_t)saddr, eaddr - saddr, prot))
355 return EFAULT;
356 return 0;
357}