dsched - Periph.: call dsched_exit on thread exit
[dragonfly.git] / sys / platform / pc32 / i386 / vm_machdep.c
CommitLineData
984263bc
MD
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 $
21ce0dfa 42 * $DragonFly: src/sys/platform/pc32/i386/vm_machdep.c,v 1.61 2008/08/02 01:14:43 dillon Exp $
984263bc
MD
43 */
44
1f2de5d4
MD
45#include "use_npx.h"
46#include "use_isa.h"
984263bc
MD
47#include "opt_reset.h"
48
49#include <sys/param.h>
50#include <sys/systm.h>
51#include <sys/malloc.h>
52#include <sys/proc.h>
53#include <sys/buf.h>
ef0fdad1 54#include <sys/interrupt.h>
984263bc
MD
55#include <sys/vnode.h>
56#include <sys/vmmeter.h>
57#include <sys/kernel.h>
58#include <sys/sysctl.h>
59#include <sys/unistd.h>
f8abf63c 60#include <sys/dsched.h>
984263bc
MD
61
62#include <machine/clock.h>
63#include <machine/cpu.h>
64#include <machine/md_var.h>
984263bc 65#include <machine/smp.h>
984263bc
MD
66#include <machine/pcb.h>
67#include <machine/pcb_ext.h>
68#include <machine/vm86.h>
4a22e893 69#include <machine/segments.h>
85100692 70#include <machine/globaldata.h> /* npxthread */
984263bc
MD
71
72#include <vm/vm.h>
73#include <vm/vm_param.h>
74#include <sys/lock.h>
75#include <vm/vm_kern.h>
76#include <vm/vm_page.h>
77#include <vm/vm_map.h>
78#include <vm/vm_extern.h>
79
80#include <sys/user.h>
684a93c4 81
ae8050a4 82#include <sys/thread2.h>
684a93c4 83#include <sys/mplock2.h>
984263bc 84
21ce0dfa 85#include <bus/isa/isa.h>
984263bc 86
3ae0cd58 87static void cpu_reset_real (void);
984263bc 88#ifdef SMP
3ae0cd58 89static void cpu_reset_proxy (void);
984263bc
MD
90static u_int cpu_reset_proxyid;
91static volatile u_int cpu_reset_proxy_active;
92#endif
93extern int _ucodesel, _udatasel;
94
984263bc
MD
95
96/*
bb3cd951 97 * Finish a fork operation, with lwp lp2 nearly set up.
984263bc
MD
98 * Copy and update the pcb, set up the stack so that the child
99 * ready to run and return to user mode.
100 */
101void
bb3cd951 102cpu_fork(struct lwp *lp1, struct lwp *lp2, int flags)
984263bc
MD
103{
104 struct pcb *pcb2;
105
106 if ((flags & RFPROC) == 0) {
984263bc
MD
107 if ((flags & RFMEM) == 0) {
108 /* unshare user LDT */
bb3cd951 109 struct pcb *pcb1 = lp1->lwp_thread->td_pcb;
984263bc
MD
110 struct pcb_ldt *pcb_ldt = pcb1->pcb_ldt;
111 if (pcb_ldt && pcb_ldt->ldt_refcnt > 1) {
112 pcb_ldt = user_ldt_alloc(pcb1,pcb_ldt->ldt_len);
113 user_ldt_free(pcb1);
114 pcb1->pcb_ldt = pcb_ldt;
115 set_user_ldt(pcb1);
116 }
117 }
984263bc
MD
118 return;
119 }
120
121#if NNPX > 0
bb3cd951
SS
122 /* Ensure that lp1's pcb is up to date. */
123 if (mdcpu->gd_npxthread == lp1->lwp_thread)
124 npxsave(lp1->lwp_thread->td_savefpu);
984263bc 125#endif
a96ef868
MD
126
127 /*
bb3cd951 128 * Copy lp1's PCB. This really only applies to the
a96ef868
MD
129 * debug registers and FP state, but its faster to just copy the
130 * whole thing. Because we only save the PCB at switchout time,
4e7c41c5 131 * the register state may not be current.
a96ef868 132 */
bb3cd951
SS
133 pcb2 = lp2->lwp_thread->td_pcb;
134 *pcb2 = *lp1->lwp_thread->td_pcb;
984263bc
MD
135
136 /*
137 * Create a new fresh stack for the new process.
138 * Copy the trap frame for the return to user mode as if from a
b7c628e4
MD
139 * syscall. This copies the user mode register values. The
140 * 16 byte offset saves space for vm86, and must match
141 * common_tss.esp0 (kernel stack pointer on entry from user mode)
8ad65e08
MD
142 *
143 * pcb_esp must allocate an additional call-return pointer below
d9eea1a5
MD
144 * the trap frame which will be restored by cpu_restore from
145 * PCB_EIP, and the thread's td_sp pointer must allocate an
146 * additonal two worsd below the pcb_esp call-return pointer to
147 * hold the LWKT restore function pointer and eflags.
8ad65e08
MD
148 *
149 * The LWKT restore function pointer must be set to cpu_restore,
150 * which is our standard heavy weight process switch-in function.
151 * YYY eventually we should shortcut fork_return and fork_trampoline
152 * to use the LWKT restore function directly so we can get rid of
153 * all the extra crap we are setting up.
984263bc 154 */
bb3cd951
SS
155 lp2->lwp_md.md_regs = (struct trapframe *)((char *)pcb2 - 16) - 1;
156 bcopy(lp1->lwp_md.md_regs, lp2->lwp_md.md_regs, sizeof(*lp2->lwp_md.md_regs));
984263bc
MD
157
158 /*
159 * Set registers for trampoline to user mode. Leave space for the
160 * return address on stack. These are the kernel mode register values.
161 */
bb3cd951 162 pcb2->pcb_cr3 = vtophys(vmspace_pmap(lp2->lwp_proc->p_vmspace)->pm_pdir);
984263bc
MD
163 pcb2->pcb_edi = 0;
164 pcb2->pcb_esi = (int)fork_return; /* fork_trampoline argument */
165 pcb2->pcb_ebp = 0;
bb3cd951
SS
166 pcb2->pcb_esp = (int)lp2->lwp_md.md_regs - sizeof(void *);
167 pcb2->pcb_ebx = (int)lp2; /* fork_trampoline argument */
984263bc 168 pcb2->pcb_eip = (int)fork_trampoline;
bb3cd951
SS
169 lp2->lwp_thread->td_sp = (char *)(pcb2->pcb_esp - sizeof(void *));
170 *(u_int32_t *)lp2->lwp_thread->td_sp = PSL_USER;
171 lp2->lwp_thread->td_sp -= sizeof(void *);
172 *(void **)lp2->lwp_thread->td_sp = (void *)cpu_heavy_restore;
a96ef868
MD
173
174 /*
984263bc
MD
175 * pcb2->pcb_ldt: duplicated below, if necessary.
176 * pcb2->pcb_savefpu: cloned above.
177 * pcb2->pcb_flags: cloned above (always 0 here?).
178 * pcb2->pcb_onfault: cloned above (always NULL here?).
179 */
180
984263bc
MD
181 /*
182 * XXX don't copy the i/o pages. this should probably be fixed.
183 */
184 pcb2->pcb_ext = 0;
185
984263bc
MD
186 /* Copy the LDT, if necessary. */
187 if (pcb2->pcb_ldt != 0) {
188 if (flags & RFMEM) {
189 pcb2->pcb_ldt->ldt_refcnt++;
190 } else {
191 pcb2->pcb_ldt = user_ldt_alloc(pcb2,
192 pcb2->pcb_ldt->ldt_len);
193 }
194 }
bb3cd951
SS
195 bcopy(&lp1->lwp_thread->td_tls, &lp2->lwp_thread->td_tls,
196 sizeof(lp2->lwp_thread->td_tls));
984263bc 197 /*
08f2f1bb 198 * Now, cpu_switch() can schedule the new lwp.
984263bc
MD
199 * pcb_esp is loaded pointing to the cpu_switch() stack frame
200 * containing the return address when exiting cpu_switch.
201 * This will normally be to fork_trampoline(), which will have
08f2f1bb
SS
202 * %ebx loaded with the new lwp's pointer. fork_trampoline()
203 * will set up a stack to call fork_return(lp, frame); to complete
984263bc
MD
204 * the return to user-mode.
205 */
206}
207
208/*
91bd9c1e
SS
209 * Prepare new lwp to return to the address specified in params.
210 */
211int
212cpu_prepare_lwp(struct lwp *lp, struct lwp_params *params)
213{
214 struct trapframe *regs = lp->lwp_md.md_regs;
215 void *bad_return = NULL;
216 int error;
217
29adef62
NT
218 regs->tf_eip = (int)params->func;
219 regs->tf_esp = (int)params->stack;
91bd9c1e
SS
220 /* Set up argument for function call */
221 regs->tf_esp -= sizeof(params->arg);
29adef62
NT
222 error =
223 copyout(&params->arg, (void *)regs->tf_esp, sizeof(params->arg));
91bd9c1e
SS
224 if (error)
225 return (error);
226 /*
227 * Set up fake return address. As the lwp function may never return,
228 * we simply copy out a NULL pointer and force the lwp to receive
229 * a SIGSEGV if it returns anyways.
230 */
231 regs->tf_esp -= sizeof(void *);
29adef62 232 error = copyout(&bad_return, (void *)regs->tf_esp, sizeof(bad_return));
91bd9c1e
SS
233 if (error)
234 return (error);
235
236 cpu_set_fork_handler(lp,
237 (void (*)(void *, struct trapframe *))generic_lwp_return, lp);
238 return (0);
239}
240
241/*
984263bc
MD
242 * Intercept the return address from a freshly forked process that has NOT
243 * been scheduled yet.
244 *
245 * This is needed to make kernel threads stay in kernel mode.
246 */
247void
91bd9c1e
SS
248cpu_set_fork_handler(struct lwp *lp, void (*func)(void *, struct trapframe *),
249 void *arg)
984263bc
MD
250{
251 /*
252 * Note that the trap frame follows the args, so the function
253 * is really called like this: func(arg, frame);
254 */
bb3cd951
SS
255 lp->lwp_thread->td_pcb->pcb_esi = (int) func; /* function */
256 lp->lwp_thread->td_pcb->pcb_ebx = (int) arg; /* first arg */
984263bc
MD
257}
258
259void
0cfcada1
MD
260cpu_set_thread_handler(thread_t td, void (*rfunc)(void), void *func, void *arg)
261{
262 td->td_pcb->pcb_esi = (int)func;
263 td->td_pcb->pcb_ebx = (int) arg;
264 td->td_switch = cpu_lwkt_switch;
265 td->td_sp -= sizeof(void *);
266 *(void **)td->td_sp = rfunc; /* exit function on return */
267 td->td_sp -= sizeof(void *);
268 *(void **)td->td_sp = cpu_kthread_restore;
269}
270
271void
c6880072 272cpu_lwp_exit(void)
984263bc 273{
99df837e 274 struct thread *td = curthread;
ae8050a4 275 struct pcb *pcb;
df011816 276 struct pcb_ext *ext;
99df837e 277
984263bc 278#if NNPX > 0
bb3cd951 279 npxexit();
984263bc 280#endif /* NNPX */
ae8050a4
MD
281
282 /*
df011816
MD
283 * If we were using a private TSS do a forced-switch to ourselves
284 * to switch back to the common TSS before freeing it.
ae8050a4 285 */
99df837e 286 pcb = td->td_pcb;
df011816
MD
287 if ((ext = pcb->pcb_ext) != NULL) {
288 crit_enter();
289 pcb->pcb_ext = NULL;
290 td->td_switch(td);
291 crit_exit();
e4846942 292 kmem_free(&kernel_map, (vm_offset_t)ext, ctob(IOPAGES + 1));
984263bc 293 }
984263bc 294 user_ldt_free(pcb);
984263bc
MD
295 if (pcb->pcb_flags & PCB_DBREGS) {
296 /*
297 * disable all hardware breakpoints
298 */
299 reset_dbregs();
300 pcb->pcb_flags &= ~PCB_DBREGS;
301 }
37af14fe 302 td->td_gd->gd_cnt.v_swtch++;
ae8050a4 303
f8abf63c 304 dsched_exit_thread(td);
37af14fe 305 crit_enter_quick(td);
09b62fa4
MD
306 if (td->td_flags & TDF_TSLEEPQ)
307 tsleep_remove(td);
37af14fe 308 lwkt_deschedule_self(td);
e56e4dea 309 lwkt_remove_tdallq(td);
99df837e
MD
310 cpu_thread_exit();
311}
312
313/*
314 * Terminate the current thread. The caller must have already acquired
315 * the thread's rwlock and placed it on a reap list or otherwise notified
316 * a reaper of its existance. We set a special assembly switch function which
317 * releases td_rwlock after it has cleaned up the MMU state and switched
318 * out the stack.
319 *
320 * Must be caller from a critical section and with the thread descheduled.
321 */
322void
323cpu_thread_exit(void)
324{
325 curthread->td_switch = cpu_exit_switch;
c1102e9f 326 curthread->td_flags |= TDF_EXITING;
8ad65e08 327 lwkt_switch();
984263bc
MD
328 panic("cpu_exit");
329}
330
99df837e
MD
331/*
332 * Process Reaper. Called after the caller has acquired the thread's
333 * rwlock and removed it from the reap list.
334 */
984263bc 335void
99df837e 336cpu_proc_wait(struct proc *p)
984263bc
MD
337{
338 /* drop per-process resources */
c6880072 339 pmap_dispose_proc(p);
984263bc
MD
340}
341
342#ifdef notyet
343static void
f123d5a1 344setredzone(u_short *pte, caddr_t vaddr)
984263bc
MD
345{
346/* eventually do this by setting up an expand-down stack segment
347 for ss0: selector, allowing stack access down to top of u.
348 this means though that protection violations need to be handled
349 thru a double fault exception that must do an integral task
350 switch to a known good context, within which a dump can be
351 taken. a sensible scheme might be to save the initial context
352 used by sched (that has physical memory mapped 1:1 at bottom)
353 and take the dump while still in mapped mode */
354}
355#endif
356
357/*
358 * Convert kernel VA to physical address
359 */
6ef943a3 360vm_paddr_t
984263bc
MD
361kvtop(void *addr)
362{
6ef943a3 363 vm_paddr_t pa;
984263bc 364
6ef943a3
MD
365 pa = pmap_kextract((vm_offset_t)addr);
366 if (pa == 0)
984263bc 367 panic("kvtop: zero page frame");
6ef943a3 368 return (pa);
984263bc
MD
369}
370
371/*
372 * Force reset the processor by invalidating the entire address space!
373 */
374
375#ifdef SMP
376static void
f123d5a1 377cpu_reset_proxy(void)
984263bc
MD
378{
379 u_int saved_mp_lock;
380
381 cpu_reset_proxy_active = 1;
382 while (cpu_reset_proxy_active == 1)
383 ; /* Wait for other cpu to disable interupts */
384 saved_mp_lock = mp_lock;
96728c05 385 mp_lock = 0; /* BSP */
26be20a0 386 kprintf("cpu_reset_proxy: Grabbed mp lock for BSP\n");
984263bc
MD
387 cpu_reset_proxy_active = 3;
388 while (cpu_reset_proxy_active == 3)
389 ; /* Wait for other cpu to enable interrupts */
390 stop_cpus((1<<cpu_reset_proxyid));
26be20a0 391 kprintf("cpu_reset_proxy: Stopped CPU %d\n", cpu_reset_proxyid);
984263bc
MD
392 DELAY(1000000);
393 cpu_reset_real();
394}
395#endif
396
397void
f123d5a1 398cpu_reset(void)
984263bc
MD
399{
400#ifdef SMP
0f7a3396 401 if (smp_active_mask == 1) {
984263bc
MD
402 cpu_reset_real();
403 /* NOTREACHED */
404 } else {
984263bc
MD
405 u_int map;
406 int cnt;
26be20a0 407 kprintf("cpu_reset called on cpu#%d\n",mycpu->gd_cpuid);
984263bc 408
0f7a3396 409 map = mycpu->gd_other_cpus & ~stopped_cpus & smp_active_mask;
984263bc
MD
410
411 if (map != 0) {
26be20a0 412 kprintf("cpu_reset: Stopping other CPUs\n");
984263bc
MD
413 stop_cpus(map); /* Stop all other CPUs */
414 }
415
72740893 416 if (mycpu->gd_cpuid == 0) {
984263bc
MD
417 DELAY(1000000);
418 cpu_reset_real();
419 /* NOTREACHED */
420 } else {
421 /* We are not BSP (CPU #0) */
422
72740893 423 cpu_reset_proxyid = mycpu->gd_cpuid;
984263bc 424 cpustop_restartfunc = cpu_reset_proxy;
26be20a0 425 kprintf("cpu_reset: Restarting BSP\n");
984263bc
MD
426 started_cpus = (1<<0); /* Restart CPU #0 */
427
428 cnt = 0;
429 while (cpu_reset_proxy_active == 0 && cnt < 10000000)
430 cnt++; /* Wait for BSP to announce restart */
431 if (cpu_reset_proxy_active == 0)
26be20a0 432 kprintf("cpu_reset: Failed to restart BSP\n");
984263bc
MD
433 __asm __volatile("cli" : : : "memory");
434 cpu_reset_proxy_active = 2;
435 cnt = 0;
436 while (cpu_reset_proxy_active == 2 && cnt < 10000000)
437 cnt++; /* Do nothing */
438 if (cpu_reset_proxy_active == 2) {
26be20a0 439 kprintf("cpu_reset: BSP did not grab mp lock\n");
984263bc
MD
440 cpu_reset_real(); /* XXX: Bogus ? */
441 }
442 cpu_reset_proxy_active = 4;
443 __asm __volatile("sti" : : : "memory");
444 while (1);
445 /* NOTREACHED */
446 }
447 }
448#else
449 cpu_reset_real();
450#endif
451}
452
453static void
f123d5a1 454cpu_reset_real(void)
984263bc 455{
984263bc
MD
456 /*
457 * Attempt to do a CPU reset via the keyboard controller,
458 * do not turn of the GateA20, as any machine that fails
459 * to do the reset here would then end up in no man's land.
460 */
461
462#if !defined(BROKEN_KEYBOARD_RESET)
463 outb(IO_KBD + 4, 0xFE);
464 DELAY(500000); /* wait 0.5 sec to see if that did it */
26be20a0
SW
465 kprintf("Keyboard reset did not work, attempting CPU shutdown\n");
466 DELAY(1000000); /* wait 1 sec for kprintf to complete */
984263bc 467#endif
984263bc
MD
468 /* force a shutdown by unmapping entire address space ! */
469 bzero((caddr_t) PTD, PAGE_SIZE);
470
471 /* "good night, sweet prince .... <THUNK!>" */
0f7a3396 472 cpu_invltlb();
984263bc
MD
473 /* NOTREACHED */
474 while(1);
475}
476
984263bc
MD
477SYSCTL_DECL(_vm_stats_misc);
478
479static int cnt_prezero;
480
481SYSCTL_INT(_vm_stats_misc, OID_AUTO,
482 cnt_prezero, CTLFLAG_RD, &cnt_prezero, 0, "");
483
26a0694b 484static void
477d3c1c 485swi_vm(void *arg, void *frame)
ef0fdad1 486{
984263bc
MD
487 if (busdma_swi_pending != 0)
488 busdma_swi();
489}
490
ef0fdad1
MD
491static void
492swi_vm_setup(void *arg)
493{
477d3c1c 494 register_swi(SWI_VM, swi_vm, NULL, "swi_vm", NULL);
ef0fdad1
MD
495}
496
ba39e2e0 497SYSINIT(vm_setup, SI_BOOT2_MACHDEP, SI_ORDER_ANY, swi_vm_setup, NULL);
ef0fdad1
MD
498
499
984263bc
MD
500/*
501 * Tell whether this address is in some physical memory region.
502 * Currently used by the kernel coredump code in order to avoid
503 * dumping the ``ISA memory hole'' which could cause indefinite hangs,
504 * or other unpredictable behaviour.
505 */
506
984263bc 507int
f123d5a1 508is_physical_memory(vm_offset_t addr)
984263bc
MD
509{
510
511#if NISA > 0
512 /* The ISA ``memory hole''. */
513 if (addr >= 0xa0000 && addr < 0x100000)
514 return 0;
515#endif
516
517 /*
518 * stuff other tests for known memory-mapped devices (PCI?)
519 * here
520 */
521
522 return 1;
523}
135d7199
MD
524
525/*
526 * platform-specific vmspace initialization (nothing for i386)
527 */
528void
529cpu_vmspace_alloc(struct vmspace *vm __unused)
530{
531}
532
533void
534cpu_vmspace_free(struct vmspace *vm __unused)
535{
536}
460426e6
MD
537
538/*
539 * Used by /dev/kmem to determine if we can safely read or write
540 * the requested KVA range.
541 */
542int
543kvm_access_check(vm_offset_t saddr, vm_offset_t eaddr, int prot)
544{
545 vm_offset_t addr;
546
547 if (saddr < KvaStart)
548 return EFAULT;
549 if (eaddr >= KvaEnd)
550 return EFAULT;
551 for (addr = saddr; addr < eaddr; addr += PAGE_SIZE) {
552 if (pmap_extract(&kernel_pmap, addr) == 0)
553 return EFAULT;
554 }
555 if (!kernacc((caddr_t)saddr, eaddr - saddr, prot))
556 return EFAULT;
557 return 0;
558}
559