2 * Copyright (c) 1990 The Regents of the University of California.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
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 $
35 * $DragonFly: src/sys/platform/pc32/i386/sys_machdep.c,v 1.2 2003/06/17 04:28:35 dillon Exp $
39 #include "opt_user_ldt.h"
41 #include <sys/param.h>
42 #include <sys/systm.h>
43 #include <sys/sysproto.h>
44 #include <sys/malloc.h>
50 #include <vm/vm_map.h>
51 #include <vm/vm_extern.h>
55 #include <machine/cpu.h>
56 #include <machine/ipl.h>
57 #include <machine/pcb_ext.h> /* pcb.h included by sys/user.h */
58 #include <machine/sysarch.h>
60 #include <machine/smp.h>
63 #include <vm/vm_kern.h> /* for kernel_map */
66 #define LD_PER_PAGE 512
67 #define NEW_MAX_LD(num) ((num + LD_PER_PAGE) & ~(LD_PER_PAGE-1))
68 #define SIZE_FROM_LARGEST_LD(num) (NEW_MAX_LD(num) << 3)
73 static int i386_get_ldt __P((struct proc *, char *));
74 static int i386_set_ldt __P((struct proc *, char *));
76 static int i386_get_ioperm __P((struct proc *, char *));
77 static int i386_set_ioperm __P((struct proc *, char *));
78 int i386_extend_pcb __P((struct proc *));
80 #ifndef _SYS_SYSPROTO_H_
90 register struct sysarch_args *uap;
97 error = i386_get_ldt(p, uap->parms);
101 error = i386_set_ldt(p, uap->parms);
104 case I386_GET_IOPERM:
105 error = i386_get_ioperm(p, uap->parms);
107 case I386_SET_IOPERM:
108 error = i386_set_ioperm(p, uap->parms);
111 error = vm86_sysarch(p, uap->parms);
121 i386_extend_pcb(struct proc *p)
126 struct soft_segment_descriptor ssd = {
127 0, /* segment base address (overwritten) */
128 ctob(IOPAGES + 1) - 1, /* length */
129 SDT_SYS386TSS, /* segment type */
130 0, /* priority level */
131 1, /* descriptor present */
133 0, /* default 32 size */
137 ext = (struct pcb_ext *)kmem_alloc(kernel_map, ctob(IOPAGES+1));
140 p->p_addr->u_pcb.pcb_ext = ext;
141 bzero(ext, sizeof(struct pcb_ext));
142 ext->ext_tss.tss_esp0 = (unsigned)p->p_addr + ctob(UPAGES) - 16;
143 ext->ext_tss.tss_ss0 = GSEL(GDATA_SEL, SEL_KPL);
145 * The last byte of the i/o map must be followed by an 0xff byte.
146 * We arbitrarily allocate 16 bytes here, to keep the starting
147 * address on a doubleword boundary.
149 offset = PAGE_SIZE - 16;
150 ext->ext_tss.tss_ioopt =
151 (offset - ((unsigned)&ext->ext_tss - (unsigned)ext)) << 16;
152 ext->ext_iomap = (caddr_t)ext + offset;
153 ext->ext_vm86.vm86_intmap = (caddr_t)ext + offset - 32;
155 addr = (u_long *)ext->ext_vm86.vm86_intmap;
156 for (i = 0; i < (ctob(IOPAGES) + 32 + 16) / sizeof(u_long); i++)
159 ssd.ssd_base = (unsigned)&ext->ext_tss;
160 ssd.ssd_limit -= ((unsigned)&ext->ext_tss - (unsigned)ext);
161 ssdtosd(&ssd, &ext->ext_tssd);
163 /* switch to the new TSS after syscall completes */
170 i386_set_ioperm(p, args)
175 struct i386_ioperm_args ua;
178 if ((error = copyin(args, &ua, sizeof(struct i386_ioperm_args))) != 0)
181 if ((error = suser(p)) != 0)
187 * While this is restricted to root, we should probably figure out
188 * whether any other driver is using this i/o address, as so not to
189 * cause confusion. This probably requires a global 'usage registry'.
192 if (p->p_addr->u_pcb.pcb_ext == 0)
193 if ((error = i386_extend_pcb(p)) != 0)
195 iomap = (char *)p->p_addr->u_pcb.pcb_ext->ext_iomap;
197 if (ua.start + ua.length > IOPAGES * PAGE_SIZE * NBBY)
200 for (i = ua.start; i < ua.start + ua.length; i++) {
202 iomap[i >> 3] &= ~(1 << (i & 7));
204 iomap[i >> 3] |= (1 << (i & 7));
210 i386_get_ioperm(p, args)
215 struct i386_ioperm_args ua;
218 if ((error = copyin(args, &ua, sizeof(struct i386_ioperm_args))) != 0)
220 if (ua.start >= IOPAGES * PAGE_SIZE * NBBY)
223 if (p->p_addr->u_pcb.pcb_ext == 0) {
228 iomap = (char *)p->p_addr->u_pcb.pcb_ext->ext_iomap;
231 state = (iomap[i >> 3] >> (i & 7)) & 1;
235 for (i = ua.start + 1; i < IOPAGES * PAGE_SIZE * NBBY; i++) {
236 if (state != ((iomap[i >> 3] >> (i & 7)) & 1))
242 error = copyout(&ua, args, sizeof(struct i386_ioperm_args));
248 * Update the GDT entry pointing to the LDT to point to the LDT of the
249 * current process. Do not staticize.
252 set_user_ldt(struct pcb *pcb)
254 struct pcb_ldt *pcb_ldt;
259 pcb_ldt = pcb->pcb_ldt;
261 gdt[cpuid * NGDT + GUSERLDT_SEL].sd = pcb_ldt->ldt_sd;
263 gdt[GUSERLDT_SEL].sd = pcb_ldt->ldt_sd;
265 lldt(GSEL(GUSERLDT_SEL, SEL_KPL));
266 currentldt = GSEL(GUSERLDT_SEL, SEL_KPL);
270 user_ldt_alloc(struct pcb *pcb, int len)
272 struct pcb_ldt *pcb_ldt, *new_ldt;
274 MALLOC(new_ldt, struct pcb_ldt *, sizeof(struct pcb_ldt),
275 M_SUBPROC, M_WAITOK);
279 new_ldt->ldt_len = len = NEW_MAX_LD(len);
280 new_ldt->ldt_base = (caddr_t)kmem_alloc(kernel_map,
281 len * sizeof(union descriptor));
282 if (new_ldt->ldt_base == NULL) {
283 FREE(new_ldt, M_SUBPROC);
286 new_ldt->ldt_refcnt = 1;
287 new_ldt->ldt_active = 0;
289 gdt_segs[GUSERLDT_SEL].ssd_base = (unsigned)new_ldt->ldt_base;
290 gdt_segs[GUSERLDT_SEL].ssd_limit = len * sizeof(union descriptor) - 1;
291 ssdtosd(&gdt_segs[GUSERLDT_SEL], &new_ldt->ldt_sd);
293 if ((pcb_ldt = pcb->pcb_ldt)) {
294 if (len > pcb_ldt->ldt_len)
295 len = pcb_ldt->ldt_len;
296 bcopy(pcb_ldt->ldt_base, new_ldt->ldt_base,
297 len * sizeof(union descriptor));
299 bcopy(ldt, new_ldt->ldt_base, sizeof(ldt));
305 user_ldt_free(struct pcb *pcb)
307 struct pcb_ldt *pcb_ldt = pcb->pcb_ldt;
314 currentldt = _default_ldt;
317 if (--pcb_ldt->ldt_refcnt == 0) {
318 kmem_free(kernel_map, (vm_offset_t)pcb_ldt->ldt_base,
319 pcb_ldt->ldt_len * sizeof(union descriptor));
320 FREE(pcb_ldt, M_SUBPROC);
326 i386_get_ldt(p, args)
331 struct pcb *pcb = &p->p_addr->u_pcb;
332 struct pcb_ldt *pcb_ldt = pcb->pcb_ldt;
334 union descriptor *lp;
336 struct i386_ldt_args ua, *uap = &ua;
338 if ((error = copyin(args, uap, sizeof(struct i386_ldt_args))) < 0)
342 printf("i386_get_ldt: start=%d num=%d descs=%p\n",
343 uap->start, uap->num, (void *)uap->descs);
346 /* verify range of LDTs exist */
347 if ((uap->start < 0) || (uap->num <= 0))
353 nldt = pcb_ldt->ldt_len;
354 num = min(uap->num, nldt);
355 lp = &((union descriptor *)(pcb_ldt->ldt_base))[uap->start];
357 nldt = sizeof(ldt)/sizeof(ldt[0]);
358 num = min(uap->num, nldt);
359 lp = &ldt[uap->start];
361 if (uap->start + num > nldt) {
366 error = copyout(lp, uap->descs, num * sizeof(union descriptor));
368 p->p_retval[0] = num;
375 i386_set_ldt(p, args)
381 struct pcb *pcb = &p->p_addr->u_pcb;
382 struct pcb_ldt *pcb_ldt = pcb->pcb_ldt;
383 union descriptor *descs;
385 struct i386_ldt_args ua, *uap = &ua;
387 if ((error = copyin(args, uap, sizeof(struct i386_ldt_args))) < 0)
391 printf("i386_set_ldt: start=%d num=%d descs=%p\n",
392 uap->start, uap->num, (void *)uap->descs);
395 /* verify range of descriptors to modify */
396 if ((uap->start < 0) || (uap->start >= MAX_LD) || (uap->num < 0) ||
401 largest_ld = uap->start + uap->num - 1;
402 if (largest_ld >= MAX_LD)
405 /* allocate user ldt */
406 if (!pcb_ldt || largest_ld >= pcb_ldt->ldt_len) {
407 struct pcb_ldt *new_ldt = user_ldt_alloc(pcb, largest_ld);
411 pcb_ldt->ldt_sd = new_ldt->ldt_sd;
412 kmem_free(kernel_map, (vm_offset_t)pcb_ldt->ldt_base,
413 pcb_ldt->ldt_len * sizeof(union descriptor));
414 pcb_ldt->ldt_base = new_ldt->ldt_base;
415 pcb_ldt->ldt_len = new_ldt->ldt_len;
416 FREE(new_ldt, M_SUBPROC);
418 pcb->pcb_ldt = pcb_ldt = new_ldt;
420 /* signal other cpus to reload ldt */
421 smp_rendezvous(NULL, (void (*)(void *))set_user_ldt, NULL, pcb);
427 descs_size = uap->num * sizeof(union descriptor);
428 descs = (union descriptor *)kmem_alloc(kernel_map, descs_size);
431 error = copyin(&uap->descs[0], descs, descs_size);
433 kmem_free(kernel_map, (vm_offset_t)descs, descs_size);
436 /* Check descriptors for access violations */
437 for (i = 0, n = uap->start; i < uap->num; i++, n++) {
438 union descriptor *dp;
441 switch (dp->sd.sd_type) {
442 case SDT_SYSNULL: /* system null */
445 case SDT_SYS286TSS: /* system 286 TSS available */
446 case SDT_SYSLDT: /* system local descriptor table */
447 case SDT_SYS286BSY: /* system 286 TSS busy */
448 case SDT_SYSTASKGT: /* system task gate */
449 case SDT_SYS286IGT: /* system 286 interrupt gate */
450 case SDT_SYS286TGT: /* system 286 trap gate */
451 case SDT_SYSNULL2: /* undefined by Intel */
452 case SDT_SYS386TSS: /* system 386 TSS available */
453 case SDT_SYSNULL3: /* undefined by Intel */
454 case SDT_SYS386BSY: /* system 386 TSS busy */
455 case SDT_SYSNULL4: /* undefined by Intel */
456 case SDT_SYS386IGT: /* system 386 interrupt gate */
457 case SDT_SYS386TGT: /* system 386 trap gate */
458 case SDT_SYS286CGT: /* system 286 call gate */
459 case SDT_SYS386CGT: /* system 386 call gate */
460 /* I can't think of any reason to allow a user proc
461 * to create a segment of these types. They are
464 kmem_free(kernel_map, (vm_offset_t)descs, descs_size);
467 /* memory segment types */
468 case SDT_MEMEC: /* memory execute only conforming */
469 case SDT_MEMEAC: /* memory execute only accessed conforming */
470 case SDT_MEMERC: /* memory execute read conforming */
471 case SDT_MEMERAC: /* memory execute read accessed conforming */
472 /* Must be "present" if executable and conforming. */
473 if (dp->sd.sd_p == 0) {
474 kmem_free(kernel_map, (vm_offset_t)descs,
479 case SDT_MEMRO: /* memory read only */
480 case SDT_MEMROA: /* memory read only accessed */
481 case SDT_MEMRW: /* memory read write */
482 case SDT_MEMRWA: /* memory read write accessed */
483 case SDT_MEMROD: /* memory read only expand dwn limit */
484 case SDT_MEMRODA: /* memory read only expand dwn lim accessed */
485 case SDT_MEMRWD: /* memory read write expand dwn limit */
486 case SDT_MEMRWDA: /* memory read write expand dwn lim acessed */
487 case SDT_MEME: /* memory execute only */
488 case SDT_MEMEA: /* memory execute only accessed */
489 case SDT_MEMER: /* memory execute read */
490 case SDT_MEMERA: /* memory execute read accessed */
493 kmem_free(kernel_map, (vm_offset_t)descs, descs_size);
498 /* Only user (ring-3) descriptors may be present. */
499 if ((dp->sd.sd_p != 0) && (dp->sd.sd_dpl != SEL_UPL)) {
500 kmem_free(kernel_map, (vm_offset_t)descs, descs_size);
509 &((union descriptor *)(pcb_ldt->ldt_base))[uap->start],
510 uap->num * sizeof(union descriptor));
511 p->p_retval[0] = uap->start;
514 kmem_free(kernel_map, (vm_offset_t)descs, descs_size);
517 #endif /* USER_LDT */