The syncer is not a process any more, deal with it as a thread.
[dragonfly.git] / sys / i386 / i386 / vm_machdep.c
CommitLineData
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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 * All rights reserved.
6 *
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.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
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.
26 *
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
37 * SUCH DAMAGE.
38 *
39 * from: @(#)vm_machdep.c 7.3 (Berkeley) 5/13/91
40 * Utah $Hdr: vm_machdep.c 1.16.1.1 89/06/23$
41 * $FreeBSD: src/sys/i386/i386/vm_machdep.c,v 1.132.2.9 2003/01/25 19:02:23 dillon Exp $
96728c05 42 * $DragonFly: src/sys/i386/i386/Attic/vm_machdep.c,v 1.18 2003/07/08 06:27:26 dillon Exp $
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43 */
44
45#include "npx.h"
46#include "opt_user_ldt.h"
47#ifdef PC98
48#include "opt_pc98.h"
49#endif
50#include "opt_reset.h"
51
52#include <sys/param.h>
53#include <sys/systm.h>
54#include <sys/malloc.h>
55#include <sys/proc.h>
56#include <sys/buf.h>
ef0fdad1 57#include <sys/interrupt.h>
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58#include <sys/vnode.h>
59#include <sys/vmmeter.h>
60#include <sys/kernel.h>
61#include <sys/sysctl.h>
62#include <sys/unistd.h>
63
64#include <machine/clock.h>
65#include <machine/cpu.h>
66#include <machine/md_var.h>
67#ifdef SMP
68#include <machine/smp.h>
69#endif
70#include <machine/pcb.h>
71#include <machine/pcb_ext.h>
72#include <machine/vm86.h>
85100692 73#include <machine/globaldata.h> /* npxthread */
ef0fdad1 74#include <machine/ipl.h> /* SWI_ */
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75
76#include <vm/vm.h>
77#include <vm/vm_param.h>
78#include <sys/lock.h>
79#include <vm/vm_kern.h>
80#include <vm/vm_page.h>
81#include <vm/vm_map.h>
82#include <vm/vm_extern.h>
83
84#include <sys/user.h>
ae8050a4 85#include <sys/thread2.h>
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86
87#ifdef PC98
88#include <pc98/pc98/pc98.h>
89#else
90#include <i386/isa/isa.h>
91#endif
92
93static void cpu_reset_real __P((void));
94#ifdef SMP
95static void cpu_reset_proxy __P((void));
96static u_int cpu_reset_proxyid;
97static volatile u_int cpu_reset_proxy_active;
98#endif
99extern int _ucodesel, _udatasel;
100
101/*
102 * quick version of vm_fault
103 */
104int
105vm_fault_quick(v, prot)
106 caddr_t v;
107 int prot;
108{
109 int r;
110
111 if (prot & VM_PROT_WRITE)
112 r = subyte(v, fubyte(v));
113 else
114 r = fubyte(v);
115 return(r);
116}
117
118/*
119 * Finish a fork operation, with process p2 nearly set up.
120 * Copy and update the pcb, set up the stack so that the child
121 * ready to run and return to user mode.
122 */
123void
124cpu_fork(p1, p2, flags)
125 register struct proc *p1, *p2;
126 int flags;
127{
128 struct pcb *pcb2;
129
130 if ((flags & RFPROC) == 0) {
131#ifdef USER_LDT
132 if ((flags & RFMEM) == 0) {
133 /* unshare user LDT */
b7c628e4 134 struct pcb *pcb1 = p1->p_thread->td_pcb;
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135 struct pcb_ldt *pcb_ldt = pcb1->pcb_ldt;
136 if (pcb_ldt && pcb_ldt->ldt_refcnt > 1) {
137 pcb_ldt = user_ldt_alloc(pcb1,pcb_ldt->ldt_len);
138 user_ldt_free(pcb1);
139 pcb1->pcb_ldt = pcb_ldt;
140 set_user_ldt(pcb1);
141 }
142 }
143#endif
144 return;
145 }
146
147#if NNPX > 0
148 /* Ensure that p1's pcb is up to date. */
263e4574 149 if (npxthread == p1->p_thread)
b7c628e4 150 npxsave(&p1->p_thread->td_pcb->pcb_save);
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151#endif
152
153 /* Copy p1's pcb. */
b7c628e4 154 pcb2 = p2->p_thread->td_pcb;
7d0bac62 155 *pcb2 = *p1->p_thread->td_pcb;
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156
157 /*
158 * Create a new fresh stack for the new process.
159 * Copy the trap frame for the return to user mode as if from a
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160 * syscall. This copies the user mode register values. The
161 * 16 byte offset saves space for vm86, and must match
162 * common_tss.esp0 (kernel stack pointer on entry from user mode)
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163 *
164 * pcb_esp must allocate an additional call-return pointer below
165 * the trap frame which will be restored by cpu_restore, and the
166 * thread's td_sp pointer must allocate an additonal call-return
167 * pointer below the pcb_esp call-return pointer to hold the LWKT
168 * restore function pointer.
169 *
170 * The LWKT restore function pointer must be set to cpu_restore,
171 * which is our standard heavy weight process switch-in function.
172 * YYY eventually we should shortcut fork_return and fork_trampoline
173 * to use the LWKT restore function directly so we can get rid of
174 * all the extra crap we are setting up.
984263bc 175 */
7d0bac62 176 p2->p_md.md_regs = (struct trapframe *)((char *)pcb2 - 16) - 1;
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177 bcopy(p1->p_md.md_regs, p2->p_md.md_regs, sizeof(*p2->p_md.md_regs));
178
179 /*
180 * Set registers for trampoline to user mode. Leave space for the
181 * return address on stack. These are the kernel mode register values.
182 */
183 pcb2->pcb_cr3 = vtophys(vmspace_pmap(p2->p_vmspace)->pm_pdir);
184 pcb2->pcb_edi = 0;
185 pcb2->pcb_esi = (int)fork_return; /* fork_trampoline argument */
186 pcb2->pcb_ebp = 0;
187 pcb2->pcb_esp = (int)p2->p_md.md_regs - sizeof(void *);
188 pcb2->pcb_ebx = (int)p2; /* fork_trampoline argument */
189 pcb2->pcb_eip = (int)fork_trampoline;
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190 p2->p_thread->td_sp = (char *)(pcb2->pcb_esp - sizeof(void *));
191 *(void **)p2->p_thread->td_sp = (void *)cpu_heavy_restore;
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192 /*
193 * pcb2->pcb_ldt: duplicated below, if necessary.
194 * pcb2->pcb_savefpu: cloned above.
195 * pcb2->pcb_flags: cloned above (always 0 here?).
196 * pcb2->pcb_onfault: cloned above (always NULL here?).
197 */
198
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199 /*
200 * XXX don't copy the i/o pages. this should probably be fixed.
201 */
202 pcb2->pcb_ext = 0;
203
204#ifdef USER_LDT
205 /* Copy the LDT, if necessary. */
206 if (pcb2->pcb_ldt != 0) {
207 if (flags & RFMEM) {
208 pcb2->pcb_ldt->ldt_refcnt++;
209 } else {
210 pcb2->pcb_ldt = user_ldt_alloc(pcb2,
211 pcb2->pcb_ldt->ldt_len);
212 }
213 }
214#endif
215
216 /*
217 * Now, cpu_switch() can schedule the new process.
218 * pcb_esp is loaded pointing to the cpu_switch() stack frame
219 * containing the return address when exiting cpu_switch.
220 * This will normally be to fork_trampoline(), which will have
221 * %ebx loaded with the new proc's pointer. fork_trampoline()
222 * will set up a stack to call fork_return(p, frame); to complete
223 * the return to user-mode.
224 */
225}
226
227/*
228 * Intercept the return address from a freshly forked process that has NOT
229 * been scheduled yet.
230 *
231 * This is needed to make kernel threads stay in kernel mode.
232 */
233void
234cpu_set_fork_handler(p, func, arg)
235 struct proc *p;
236 void (*func) __P((void *));
237 void *arg;
238{
239 /*
240 * Note that the trap frame follows the args, so the function
241 * is really called like this: func(arg, frame);
242 */
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243 p->p_thread->td_pcb->pcb_esi = (int) func; /* function */
244 p->p_thread->td_pcb->pcb_ebx = (int) arg; /* first arg */
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245}
246
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247void
248cpu_set_thread_handler(thread_t td, void (*rfunc)(void), void *func, void *arg)
249{
250 td->td_pcb->pcb_esi = (int)func;
251 td->td_pcb->pcb_ebx = (int) arg;
252 td->td_switch = cpu_lwkt_switch;
253 td->td_sp -= sizeof(void *);
254 *(void **)td->td_sp = rfunc; /* exit function on return */
255 td->td_sp -= sizeof(void *);
256 *(void **)td->td_sp = cpu_kthread_restore;
257}
258
984263bc 259void
99df837e 260cpu_proc_exit(void)
984263bc 261{
99df837e 262 struct thread *td = curthread;
ae8050a4 263 struct pcb *pcb;
8ad65e08 264
99df837e 265
984263bc 266#if NNPX > 0
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267 KKASSERT(td->td_proc);
268 npxexit(td->td_proc);
984263bc 269#endif /* NNPX */
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270
271 /*
272 * Cleanup the PCB
273 */
99df837e 274 pcb = td->td_pcb;
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275 if (pcb->pcb_ext != 0) {
276 /*
277 * XXX do we need to move the TSS off the allocated pages
278 * before freeing them? (not done here)
279 */
280 kmem_free(kernel_map, (vm_offset_t)pcb->pcb_ext,
281 ctob(IOPAGES + 1));
282 pcb->pcb_ext = 0;
283 }
284#ifdef USER_LDT
285 user_ldt_free(pcb);
286#endif
287 if (pcb->pcb_flags & PCB_DBREGS) {
288 /*
289 * disable all hardware breakpoints
290 */
291 reset_dbregs();
292 pcb->pcb_flags &= ~PCB_DBREGS;
293 }
12e4aaff 294 mycpu->gd_cnt.v_swtch++;
ae8050a4 295
ae8050a4 296 crit_enter();
ae8050a4 297 lwkt_deschedule_self();
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298 cpu_thread_exit();
299}
300
301/*
302 * Terminate the current thread. The caller must have already acquired
303 * the thread's rwlock and placed it on a reap list or otherwise notified
304 * a reaper of its existance. We set a special assembly switch function which
305 * releases td_rwlock after it has cleaned up the MMU state and switched
306 * out the stack.
307 *
308 * Must be caller from a critical section and with the thread descheduled.
309 */
310void
311cpu_thread_exit(void)
312{
313 curthread->td_switch = cpu_exit_switch;
8ad65e08 314 lwkt_switch();
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315 panic("cpu_exit");
316}
317
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318/*
319 * Process Reaper. Called after the caller has acquired the thread's
320 * rwlock and removed it from the reap list.
321 */
984263bc 322void
99df837e 323cpu_proc_wait(struct proc *p)
984263bc 324{
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325 struct thread *td;
326
984263bc 327 /* drop per-process resources */
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328 td = pmap_dispose_proc(p);
329 if (td)
99df837e 330 lwkt_free_thread(td);
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331}
332
333/*
334 * Dump the machine specific header information at the start of a core dump.
335 */
336int
dadab5e9 337cpu_coredump(struct thread *td, struct vnode *vp, struct ucred *cred)
984263bc 338{
dadab5e9 339 struct proc *p = td->td_proc;
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340 int error;
341 caddr_t tempuser;
342
dadab5e9 343 KKASSERT(p);
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344 tempuser = malloc(ctob(UPAGES), M_TEMP, M_WAITOK);
345 if (!tempuser)
346 return EINVAL;
347
348 bzero(tempuser, ctob(UPAGES));
349 bcopy(p->p_addr, tempuser, sizeof(struct user));
350 bcopy(p->p_md.md_regs,
351 tempuser + ((caddr_t) p->p_md.md_regs - (caddr_t) p->p_addr),
352 sizeof(struct trapframe));
b7c628e4 353 bcopy(p->p_thread->td_pcb, tempuser + ((char *)p->p_thread->td_pcb - (char *)p->p_addr), sizeof(struct pcb));
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354
355 error = vn_rdwr(UIO_WRITE, vp, (caddr_t) tempuser, ctob(UPAGES),
dadab5e9 356 (off_t)0, UIO_SYSSPACE, IO_UNIT, cred, (int *)NULL, td);
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357
358 free(tempuser, M_TEMP);
359
360 return error;
361}
362
363#ifdef notyet
364static void
365setredzone(pte, vaddr)
366 u_short *pte;
367 caddr_t vaddr;
368{
369/* eventually do this by setting up an expand-down stack segment
370 for ss0: selector, allowing stack access down to top of u.
371 this means though that protection violations need to be handled
372 thru a double fault exception that must do an integral task
373 switch to a known good context, within which a dump can be
374 taken. a sensible scheme might be to save the initial context
375 used by sched (that has physical memory mapped 1:1 at bottom)
376 and take the dump while still in mapped mode */
377}
378#endif
379
380/*
381 * Convert kernel VA to physical address
382 */
383u_long
384kvtop(void *addr)
385{
386 vm_offset_t va;
387
388 va = pmap_kextract((vm_offset_t)addr);
389 if (va == 0)
390 panic("kvtop: zero page frame");
391 return((int)va);
392}
393
394/*
395 * Force reset the processor by invalidating the entire address space!
396 */
397
398#ifdef SMP
399static void
400cpu_reset_proxy()
401{
402 u_int saved_mp_lock;
403
404 cpu_reset_proxy_active = 1;
405 while (cpu_reset_proxy_active == 1)
406 ; /* Wait for other cpu to disable interupts */
407 saved_mp_lock = mp_lock;
96728c05 408 mp_lock = 0; /* BSP */
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409 printf("cpu_reset_proxy: Grabbed mp lock for BSP\n");
410 cpu_reset_proxy_active = 3;
411 while (cpu_reset_proxy_active == 3)
412 ; /* Wait for other cpu to enable interrupts */
413 stop_cpus((1<<cpu_reset_proxyid));
414 printf("cpu_reset_proxy: Stopped CPU %d\n", cpu_reset_proxyid);
415 DELAY(1000000);
416 cpu_reset_real();
417}
418#endif
419
420void
421cpu_reset()
422{
423#ifdef SMP
424 if (smp_active == 0) {
425 cpu_reset_real();
426 /* NOTREACHED */
427 } else {
428
429 u_int map;
430 int cnt;
72740893 431 printf("cpu_reset called on cpu#%d\n",mycpu->gd_cpuid);
984263bc 432
72740893 433 map = mycpu->gd_other_cpus & ~ stopped_cpus;
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434
435 if (map != 0) {
436 printf("cpu_reset: Stopping other CPUs\n");
437 stop_cpus(map); /* Stop all other CPUs */
438 }
439
72740893 440 if (mycpu->gd_cpuid == 0) {
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441 DELAY(1000000);
442 cpu_reset_real();
443 /* NOTREACHED */
444 } else {
445 /* We are not BSP (CPU #0) */
446
72740893 447 cpu_reset_proxyid = mycpu->gd_cpuid;
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448 cpustop_restartfunc = cpu_reset_proxy;
449 printf("cpu_reset: Restarting BSP\n");
450 started_cpus = (1<<0); /* Restart CPU #0 */
451
452 cnt = 0;
453 while (cpu_reset_proxy_active == 0 && cnt < 10000000)
454 cnt++; /* Wait for BSP to announce restart */
455 if (cpu_reset_proxy_active == 0)
456 printf("cpu_reset: Failed to restart BSP\n");
457 __asm __volatile("cli" : : : "memory");
458 cpu_reset_proxy_active = 2;
459 cnt = 0;
460 while (cpu_reset_proxy_active == 2 && cnt < 10000000)
461 cnt++; /* Do nothing */
462 if (cpu_reset_proxy_active == 2) {
463 printf("cpu_reset: BSP did not grab mp lock\n");
464 cpu_reset_real(); /* XXX: Bogus ? */
465 }
466 cpu_reset_proxy_active = 4;
467 __asm __volatile("sti" : : : "memory");
468 while (1);
469 /* NOTREACHED */
470 }
471 }
472#else
473 cpu_reset_real();
474#endif
475}
476
477static void
478cpu_reset_real()
479{
480
481#ifdef PC98
482 /*
483 * Attempt to do a CPU reset via CPU reset port.
484 */
485 disable_intr();
486 if ((inb(0x35) & 0xa0) != 0xa0) {
487 outb(0x37, 0x0f); /* SHUT0 = 0. */
488 outb(0x37, 0x0b); /* SHUT1 = 0. */
489 }
490 outb(0xf0, 0x00); /* Reset. */
491#else
492 /*
493 * Attempt to do a CPU reset via the keyboard controller,
494 * do not turn of the GateA20, as any machine that fails
495 * to do the reset here would then end up in no man's land.
496 */
497
498#if !defined(BROKEN_KEYBOARD_RESET)
499 outb(IO_KBD + 4, 0xFE);
500 DELAY(500000); /* wait 0.5 sec to see if that did it */
501 printf("Keyboard reset did not work, attempting CPU shutdown\n");
502 DELAY(1000000); /* wait 1 sec for printf to complete */
503#endif
504#endif /* PC98 */
505 /* force a shutdown by unmapping entire address space ! */
506 bzero((caddr_t) PTD, PAGE_SIZE);
507
508 /* "good night, sweet prince .... <THUNK!>" */
509 invltlb();
510 /* NOTREACHED */
511 while(1);
512}
513
514int
515grow_stack(p, sp)
516 struct proc *p;
517 u_int sp;
518{
519 int rv;
520
521 rv = vm_map_growstack (p, sp);
522 if (rv != KERN_SUCCESS)
523 return (0);
524
525 return (1);
526}
527
528SYSCTL_DECL(_vm_stats_misc);
529
530static int cnt_prezero;
531
532SYSCTL_INT(_vm_stats_misc, OID_AUTO,
533 cnt_prezero, CTLFLAG_RD, &cnt_prezero, 0, "");
534
535/*
536 * Implement the pre-zeroed page mechanism.
537 * This routine is called from the idle loop.
538 */
539
540#define ZIDLE_LO(v) ((v) * 2 / 3)
541#define ZIDLE_HI(v) ((v) * 4 / 5)
542
543int
544vm_page_zero_idle()
545{
546 static int free_rover;
547 static int zero_state;
548 vm_page_t m;
549 int s;
550
551 /*
552 * Attempt to maintain approximately 1/2 of our free pages in a
553 * PG_ZERO'd state. Add some hysteresis to (attempt to) avoid
554 * generally zeroing a page when the system is near steady-state.
555 * Otherwise we might get 'flutter' during disk I/O / IPC or
556 * fast sleeps. We also do not want to be continuously zeroing
557 * pages because doing so may flush our L1 and L2 caches too much.
558 */
559
12e4aaff 560 if (zero_state && vm_page_zero_count >= ZIDLE_LO(vmstats.v_free_count))
984263bc 561 return(0);
12e4aaff 562 if (vm_page_zero_count >= ZIDLE_HI(vmstats.v_free_count))
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563 return(0);
564
565#ifdef SMP
566 if (try_mplock()) {
567#endif
568 s = splvm();
569 __asm __volatile("sti" : : : "memory");
570 zero_state = 0;
571 m = vm_page_list_find(PQ_FREE, free_rover, FALSE);
572 if (m != NULL && (m->flags & PG_ZERO) == 0) {
573 vm_page_queues[m->queue].lcnt--;
574 TAILQ_REMOVE(&vm_page_queues[m->queue].pl, m, pageq);
575 m->queue = PQ_NONE;
576 splx(s);
577 pmap_zero_page(VM_PAGE_TO_PHYS(m));
578 (void)splvm();
579 vm_page_flag_set(m, PG_ZERO);
580 m->queue = PQ_FREE + m->pc;
581 vm_page_queues[m->queue].lcnt++;
582 TAILQ_INSERT_TAIL(&vm_page_queues[m->queue].pl, m,
583 pageq);
584 ++vm_page_zero_count;
585 ++cnt_prezero;
12e4aaff 586 if (vm_page_zero_count >= ZIDLE_HI(vmstats.v_free_count))
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587 zero_state = 1;
588 }
589 free_rover = (free_rover + PQ_PRIME2) & PQ_L2_MASK;
590 splx(s);
591 __asm __volatile("cli" : : : "memory");
592#ifdef SMP
593 rel_mplock();
594#endif
595 return (1);
596#ifdef SMP
597 }
598#endif
599 /*
600 * We have to enable interrupts for a moment if the try_mplock fails
601 * in order to potentially take an IPI. XXX this should be in
602 * swtch.s
603 */
604 __asm __volatile("sti; nop; cli" : : : "memory");
605 return (0);
606}
607
26a0694b 608static void
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609swi_vm(void *arg)
610{
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611 if (busdma_swi_pending != 0)
612 busdma_swi();
613}
614
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615static void
616swi_vm_setup(void *arg)
617{
618 register_swi(SWI_VM, swi_vm, NULL, "swi_vm");
619}
620
621SYSINIT(vm_setup, SI_SUB_CPU, SI_ORDER_ANY, swi_vm_setup, NULL);
622
623
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624/*
625 * Tell whether this address is in some physical memory region.
626 * Currently used by the kernel coredump code in order to avoid
627 * dumping the ``ISA memory hole'' which could cause indefinite hangs,
628 * or other unpredictable behaviour.
629 */
630
631#include "isa.h"
632
633int
634is_physical_memory(addr)
635 vm_offset_t addr;
636{
637
638#if NISA > 0
639 /* The ISA ``memory hole''. */
640 if (addr >= 0xa0000 && addr < 0x100000)
641 return 0;
642#endif
643
644 /*
645 * stuff other tests for known memory-mapped devices (PCI?)
646 * here
647 */
648
649 return 1;
650}