Fix CPU stats percentages formatting
[dragonfly.git] / sys / platform / pc32 / i386 / sys_machdep.c
CommitLineData
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1/*-
2 * Copyright (c) 1990 The Regents of the University of California.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * from: @(#)sys_machdep.c 5.5 (Berkeley) 1/19/91
34 * $FreeBSD: src/sys/i386/i386/sys_machdep.c,v 1.47.2.3 2002/10/07 17:20:00 jhb Exp $
90b9818c 35 * $DragonFly: src/sys/platform/pc32/i386/sys_machdep.c,v 1.9 2003/07/26 18:12:42 dillon Exp $
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36 *
37 */
38
39#include "opt_user_ldt.h"
40
41#include <sys/param.h>
42#include <sys/systm.h>
43#include <sys/sysproto.h>
44#include <sys/malloc.h>
85100692 45#include <sys/thread.h>
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46#include <sys/proc.h>
47
48#include <vm/vm.h>
49#include <sys/lock.h>
50#include <vm/pmap.h>
51#include <vm/vm_map.h>
52#include <vm/vm_extern.h>
53
54#include <sys/user.h>
55
56#include <machine/cpu.h>
57#include <machine/ipl.h>
58#include <machine/pcb_ext.h> /* pcb.h included by sys/user.h */
59#include <machine/sysarch.h>
60#ifdef SMP
61#include <machine/smp.h>
62#endif
85100692 63#include <machine/globaldata.h> /* mdcpu */
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64
65#include <vm/vm_kern.h> /* for kernel_map */
66
67#define MAX_LD 8192
68#define LD_PER_PAGE 512
69#define NEW_MAX_LD(num) ((num + LD_PER_PAGE) & ~(LD_PER_PAGE-1))
70#define SIZE_FROM_LARGEST_LD(num) (NEW_MAX_LD(num) << 3)
71
72
73
74#ifdef USER_LDT
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75static int i386_get_ldt __P((struct proc *, char *, int *));
76static int i386_set_ldt __P((struct proc *, char *, int *));
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77#endif
78static int i386_get_ioperm __P((struct proc *, char *));
79static int i386_set_ioperm __P((struct proc *, char *));
80int i386_extend_pcb __P((struct proc *));
81
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82/*
83 * sysarch_args(int op, char *params)
84 */
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85
86int
41c20dac 87sysarch(struct sysarch_args *uap)
984263bc 88{
41c20dac 89 struct proc *p = curproc;
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90 int error = 0;
91
92 switch(uap->op) {
93#ifdef USER_LDT
94 case I386_GET_LDT:
90b9818c 95 error = i386_get_ldt(p, uap->parms, &uap->lmsg.u.ms_result);
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96 break;
97
98 case I386_SET_LDT:
90b9818c 99 error = i386_set_ldt(p, uap->parms, &uap->lmsg.u.ms_result);
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100 break;
101#endif
102 case I386_GET_IOPERM:
103 error = i386_get_ioperm(p, uap->parms);
104 break;
105 case I386_SET_IOPERM:
106 error = i386_set_ioperm(p, uap->parms);
107 break;
108 case I386_VM86:
109 error = vm86_sysarch(p, uap->parms);
110 break;
111 default:
112 error = EOPNOTSUPP;
113 break;
114 }
115 return (error);
116}
117
118int
119i386_extend_pcb(struct proc *p)
120{
121 int i, offset;
122 u_long *addr;
123 struct pcb_ext *ext;
124 struct soft_segment_descriptor ssd = {
125 0, /* segment base address (overwritten) */
126 ctob(IOPAGES + 1) - 1, /* length */
127 SDT_SYS386TSS, /* segment type */
128 0, /* priority level */
129 1, /* descriptor present */
130 0, 0,
131 0, /* default 32 size */
132 0 /* granularity */
133 };
134
135 ext = (struct pcb_ext *)kmem_alloc(kernel_map, ctob(IOPAGES+1));
136 if (ext == 0)
137 return (ENOMEM);
b7c628e4 138 p->p_thread->td_pcb->pcb_ext = ext;
984263bc 139 bzero(ext, sizeof(struct pcb_ext));
b7c628e4 140 ext->ext_tss.tss_esp0 = (unsigned)((char *)p->p_thread->td_pcb - 16);
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141 ext->ext_tss.tss_ss0 = GSEL(GDATA_SEL, SEL_KPL);
142 /*
143 * The last byte of the i/o map must be followed by an 0xff byte.
144 * We arbitrarily allocate 16 bytes here, to keep the starting
145 * address on a doubleword boundary.
146 */
147 offset = PAGE_SIZE - 16;
148 ext->ext_tss.tss_ioopt =
149 (offset - ((unsigned)&ext->ext_tss - (unsigned)ext)) << 16;
150 ext->ext_iomap = (caddr_t)ext + offset;
151 ext->ext_vm86.vm86_intmap = (caddr_t)ext + offset - 32;
152
153 addr = (u_long *)ext->ext_vm86.vm86_intmap;
154 for (i = 0; i < (ctob(IOPAGES) + 32 + 16) / sizeof(u_long); i++)
155 *addr++ = ~0;
156
157 ssd.ssd_base = (unsigned)&ext->ext_tss;
158 ssd.ssd_limit -= ((unsigned)&ext->ext_tss - (unsigned)ext);
159 ssdtosd(&ssd, &ext->ext_tssd);
160
161 /* switch to the new TSS after syscall completes */
162 need_resched();
163
164 return 0;
165}
166
167static int
dadab5e9 168i386_set_ioperm(struct proc *p, char *args)
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169{
170 int i, error;
171 struct i386_ioperm_args ua;
172 char *iomap;
173
174 if ((error = copyin(args, &ua, sizeof(struct i386_ioperm_args))) != 0)
175 return (error);
176
dadab5e9 177 if ((error = suser_cred(p->p_ucred, 0)) != 0)
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178 return (error);
179 if (securelevel > 0)
180 return (EPERM);
181 /*
182 * XXX
183 * While this is restricted to root, we should probably figure out
184 * whether any other driver is using this i/o address, as so not to
185 * cause confusion. This probably requires a global 'usage registry'.
186 */
187
b7c628e4 188 if (p->p_thread->td_pcb->pcb_ext == 0)
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189 if ((error = i386_extend_pcb(p)) != 0)
190 return (error);
b7c628e4 191 iomap = (char *)p->p_thread->td_pcb->pcb_ext->ext_iomap;
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192
193 if (ua.start + ua.length > IOPAGES * PAGE_SIZE * NBBY)
194 return (EINVAL);
195
196 for (i = ua.start; i < ua.start + ua.length; i++) {
197 if (ua.enable)
198 iomap[i >> 3] &= ~(1 << (i & 7));
199 else
200 iomap[i >> 3] |= (1 << (i & 7));
201 }
202 return (error);
203}
204
205static int
85100692 206i386_get_ioperm(struct proc *p, char *args)
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207{
208 int i, state, error;
209 struct i386_ioperm_args ua;
210 char *iomap;
211
212 if ((error = copyin(args, &ua, sizeof(struct i386_ioperm_args))) != 0)
213 return (error);
214 if (ua.start >= IOPAGES * PAGE_SIZE * NBBY)
215 return (EINVAL);
216
b7c628e4 217 if (p->p_thread->td_pcb->pcb_ext == 0) {
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218 ua.length = 0;
219 goto done;
220 }
221
b7c628e4 222 iomap = (char *)p->p_thread->td_pcb->pcb_ext->ext_iomap;
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223
224 i = ua.start;
225 state = (iomap[i >> 3] >> (i & 7)) & 1;
226 ua.enable = !state;
227 ua.length = 1;
228
229 for (i = ua.start + 1; i < IOPAGES * PAGE_SIZE * NBBY; i++) {
230 if (state != ((iomap[i >> 3] >> (i & 7)) & 1))
231 break;
232 ua.length++;
233 }
234
235done:
236 error = copyout(&ua, args, sizeof(struct i386_ioperm_args));
237 return (error);
238}
239
240#ifdef USER_LDT
241/*
242 * Update the GDT entry pointing to the LDT to point to the LDT of the
243 * current process. Do not staticize.
244 */
245void
246set_user_ldt(struct pcb *pcb)
247{
248 struct pcb_ldt *pcb_ldt;
249
b7c628e4 250 if (pcb != curthread->td_pcb)
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251 return;
252
253 pcb_ldt = pcb->pcb_ldt;
254#ifdef SMP
7b95be2a 255 gdt[mycpu->gd_cpuid * NGDT + GUSERLDT_SEL].sd = pcb_ldt->ldt_sd;
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256#else
257 gdt[GUSERLDT_SEL].sd = pcb_ldt->ldt_sd;
258#endif
259 lldt(GSEL(GUSERLDT_SEL, SEL_KPL));
85100692 260 mdcpu->gd_currentldt = GSEL(GUSERLDT_SEL, SEL_KPL);
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261}
262
263struct pcb_ldt *
264user_ldt_alloc(struct pcb *pcb, int len)
265{
266 struct pcb_ldt *pcb_ldt, *new_ldt;
267
268 MALLOC(new_ldt, struct pcb_ldt *, sizeof(struct pcb_ldt),
269 M_SUBPROC, M_WAITOK);
270 if (new_ldt == NULL)
271 return NULL;
272
273 new_ldt->ldt_len = len = NEW_MAX_LD(len);
274 new_ldt->ldt_base = (caddr_t)kmem_alloc(kernel_map,
275 len * sizeof(union descriptor));
276 if (new_ldt->ldt_base == NULL) {
277 FREE(new_ldt, M_SUBPROC);
278 return NULL;
279 }
280 new_ldt->ldt_refcnt = 1;
281 new_ldt->ldt_active = 0;
282
283 gdt_segs[GUSERLDT_SEL].ssd_base = (unsigned)new_ldt->ldt_base;
284 gdt_segs[GUSERLDT_SEL].ssd_limit = len * sizeof(union descriptor) - 1;
285 ssdtosd(&gdt_segs[GUSERLDT_SEL], &new_ldt->ldt_sd);
286
287 if ((pcb_ldt = pcb->pcb_ldt)) {
288 if (len > pcb_ldt->ldt_len)
289 len = pcb_ldt->ldt_len;
290 bcopy(pcb_ldt->ldt_base, new_ldt->ldt_base,
291 len * sizeof(union descriptor));
292 } else {
293 bcopy(ldt, new_ldt->ldt_base, sizeof(ldt));
294 }
295 return new_ldt;
296}
297
298void
299user_ldt_free(struct pcb *pcb)
300{
301 struct pcb_ldt *pcb_ldt = pcb->pcb_ldt;
302
303 if (pcb_ldt == NULL)
304 return;
305
b7c628e4 306 if (pcb == curthread->td_pcb) {
984263bc 307 lldt(_default_ldt);
85100692 308 mdcpu->gd_currentldt = _default_ldt;
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309 }
310
311 if (--pcb_ldt->ldt_refcnt == 0) {
312 kmem_free(kernel_map, (vm_offset_t)pcb_ldt->ldt_base,
313 pcb_ldt->ldt_len * sizeof(union descriptor));
314 FREE(pcb_ldt, M_SUBPROC);
315 }
316 pcb->pcb_ldt = NULL;
317}
318
319static int
90b9818c 320i386_get_ldt(struct proc *p, char *args, int *res)
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321{
322 int error = 0;
b7c628e4 323 struct pcb *pcb = p->p_thread->td_pcb;
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324 struct pcb_ldt *pcb_ldt = pcb->pcb_ldt;
325 int nldt, num;
326 union descriptor *lp;
327 int s;
328 struct i386_ldt_args ua, *uap = &ua;
329
330 if ((error = copyin(args, uap, sizeof(struct i386_ldt_args))) < 0)
331 return(error);
332
333#ifdef DEBUG
334 printf("i386_get_ldt: start=%d num=%d descs=%p\n",
335 uap->start, uap->num, (void *)uap->descs);
336#endif
337
338 /* verify range of LDTs exist */
339 if ((uap->start < 0) || (uap->num <= 0))
340 return(EINVAL);
341
342 s = splhigh();
343
344 if (pcb_ldt) {
345 nldt = pcb_ldt->ldt_len;
346 num = min(uap->num, nldt);
347 lp = &((union descriptor *)(pcb_ldt->ldt_base))[uap->start];
348 } else {
349 nldt = sizeof(ldt)/sizeof(ldt[0]);
350 num = min(uap->num, nldt);
351 lp = &ldt[uap->start];
352 }
353 if (uap->start + num > nldt) {
354 splx(s);
355 return(EINVAL);
356 }
357
358 error = copyout(lp, uap->descs, num * sizeof(union descriptor));
359 if (!error)
90b9818c 360 *res = num;
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361 splx(s);
362 return(error);
363}
364
365static int
90b9818c 366i386_set_ldt(struct proc *p, char *args, int *res)
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367{
368 int error = 0, i, n;
369 int largest_ld;
b7c628e4 370 struct pcb *pcb = p->p_thread->td_pcb;
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371 struct pcb_ldt *pcb_ldt = pcb->pcb_ldt;
372 union descriptor *descs;
373 int descs_size, s;
374 struct i386_ldt_args ua, *uap = &ua;
375
376 if ((error = copyin(args, uap, sizeof(struct i386_ldt_args))) < 0)
377 return(error);
378
379#ifdef DEBUG
380 printf("i386_set_ldt: start=%d num=%d descs=%p\n",
381 uap->start, uap->num, (void *)uap->descs);
382#endif
383
384 /* verify range of descriptors to modify */
385 if ((uap->start < 0) || (uap->start >= MAX_LD) || (uap->num < 0) ||
386 (uap->num > MAX_LD))
387 {
388 return(EINVAL);
389 }
390 largest_ld = uap->start + uap->num - 1;
391 if (largest_ld >= MAX_LD)
392 return(EINVAL);
393
394 /* allocate user ldt */
395 if (!pcb_ldt || largest_ld >= pcb_ldt->ldt_len) {
396 struct pcb_ldt *new_ldt = user_ldt_alloc(pcb, largest_ld);
397 if (new_ldt == NULL)
398 return ENOMEM;
399 if (pcb_ldt) {
400 pcb_ldt->ldt_sd = new_ldt->ldt_sd;
401 kmem_free(kernel_map, (vm_offset_t)pcb_ldt->ldt_base,
402 pcb_ldt->ldt_len * sizeof(union descriptor));
403 pcb_ldt->ldt_base = new_ldt->ldt_base;
404 pcb_ldt->ldt_len = new_ldt->ldt_len;
405 FREE(new_ldt, M_SUBPROC);
406 } else
407 pcb->pcb_ldt = pcb_ldt = new_ldt;
408#ifdef SMP
409 /* signal other cpus to reload ldt */
410 smp_rendezvous(NULL, (void (*)(void *))set_user_ldt, NULL, pcb);
411#else
412 set_user_ldt(pcb);
413#endif
414 }
415
416 descs_size = uap->num * sizeof(union descriptor);
417 descs = (union descriptor *)kmem_alloc(kernel_map, descs_size);
418 if (descs == NULL)
419 return (ENOMEM);
420 error = copyin(&uap->descs[0], descs, descs_size);
421 if (error) {
422 kmem_free(kernel_map, (vm_offset_t)descs, descs_size);
423 return (error);
424 }
425 /* Check descriptors for access violations */
426 for (i = 0, n = uap->start; i < uap->num; i++, n++) {
427 union descriptor *dp;
428 dp = &descs[i];
429
430 switch (dp->sd.sd_type) {
431 case SDT_SYSNULL: /* system null */
432 dp->sd.sd_p = 0;
433 break;
434 case SDT_SYS286TSS: /* system 286 TSS available */
435 case SDT_SYSLDT: /* system local descriptor table */
436 case SDT_SYS286BSY: /* system 286 TSS busy */
437 case SDT_SYSTASKGT: /* system task gate */
438 case SDT_SYS286IGT: /* system 286 interrupt gate */
439 case SDT_SYS286TGT: /* system 286 trap gate */
440 case SDT_SYSNULL2: /* undefined by Intel */
441 case SDT_SYS386TSS: /* system 386 TSS available */
442 case SDT_SYSNULL3: /* undefined by Intel */
443 case SDT_SYS386BSY: /* system 386 TSS busy */
444 case SDT_SYSNULL4: /* undefined by Intel */
445 case SDT_SYS386IGT: /* system 386 interrupt gate */
446 case SDT_SYS386TGT: /* system 386 trap gate */
447 case SDT_SYS286CGT: /* system 286 call gate */
448 case SDT_SYS386CGT: /* system 386 call gate */
449 /* I can't think of any reason to allow a user proc
450 * to create a segment of these types. They are
451 * for OS use only.
452 */
453 kmem_free(kernel_map, (vm_offset_t)descs, descs_size);
454 return EACCES;
455
456 /* memory segment types */
457 case SDT_MEMEC: /* memory execute only conforming */
458 case SDT_MEMEAC: /* memory execute only accessed conforming */
459 case SDT_MEMERC: /* memory execute read conforming */
460 case SDT_MEMERAC: /* memory execute read accessed conforming */
461 /* Must be "present" if executable and conforming. */
462 if (dp->sd.sd_p == 0) {
463 kmem_free(kernel_map, (vm_offset_t)descs,
464 descs_size);
465 return (EACCES);
466 }
467 break;
468 case SDT_MEMRO: /* memory read only */
469 case SDT_MEMROA: /* memory read only accessed */
470 case SDT_MEMRW: /* memory read write */
471 case SDT_MEMRWA: /* memory read write accessed */
472 case SDT_MEMROD: /* memory read only expand dwn limit */
473 case SDT_MEMRODA: /* memory read only expand dwn lim accessed */
474 case SDT_MEMRWD: /* memory read write expand dwn limit */
475 case SDT_MEMRWDA: /* memory read write expand dwn lim acessed */
476 case SDT_MEME: /* memory execute only */
477 case SDT_MEMEA: /* memory execute only accessed */
478 case SDT_MEMER: /* memory execute read */
479 case SDT_MEMERA: /* memory execute read accessed */
480 break;
481 default:
482 kmem_free(kernel_map, (vm_offset_t)descs, descs_size);
483 return(EINVAL);
484 /*NOTREACHED*/
485 }
486
487 /* Only user (ring-3) descriptors may be present. */
488 if ((dp->sd.sd_p != 0) && (dp->sd.sd_dpl != SEL_UPL)) {
489 kmem_free(kernel_map, (vm_offset_t)descs, descs_size);
490 return (EACCES);
491 }
492 }
493
494 s = splhigh();
495
496 /* Fill in range */
497 bcopy(descs,
498 &((union descriptor *)(pcb_ldt->ldt_base))[uap->start],
499 uap->num * sizeof(union descriptor));
90b9818c 500 *res = uap->start;
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501
502 splx(s);
503 kmem_free(kernel_map, (vm_offset_t)descs, descs_size);
504 return (0);
505}
506#endif /* USER_LDT */