File: /usr/src/linux/arch/m68k/kernel/sys_m68k.c
1 /*
2 * linux/arch/m68k/kernel/sys_m68k.c
3 *
4 * This file contains various random system calls that
5 * have a non-standard calling sequence on the Linux/m68k
6 * platform.
7 */
8
9 #include <linux/errno.h>
10 #include <linux/sched.h>
11 #include <linux/mm.h>
12 #include <linux/smp.h>
13 #include <linux/smp_lock.h>
14 #include <linux/sem.h>
15 #include <linux/msg.h>
16 #include <linux/shm.h>
17 #include <linux/stat.h>
18 #include <linux/mman.h>
19 #include <linux/file.h>
20 #include <linux/utsname.h>
21
22 #include <asm/setup.h>
23 #include <asm/uaccess.h>
24 #include <asm/cachectl.h>
25 #include <asm/traps.h>
26 #include <asm/ipc.h>
27 #include <asm/page.h>
28
29 /*
30 * sys_pipe() is the normal C calling standard for creating
31 * a pipe. It's not the way unix traditionally does this, though.
32 */
33 asmlinkage int sys_pipe(unsigned long * fildes)
34 {
35 int fd[2];
36 int error;
37
38 error = do_pipe(fd);
39 if (!error) {
40 if (copy_to_user(fildes, fd, 2*sizeof(int)))
41 error = -EFAULT;
42 }
43 return error;
44 }
45
46 /* common code for old and new mmaps */
47 static inline long do_mmap2(
48 unsigned long addr, unsigned long len,
49 unsigned long prot, unsigned long flags,
50 unsigned long fd, unsigned long pgoff)
51 {
52 int error = -EBADF;
53 struct file * file = NULL;
54
55 flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
56 if (!(flags & MAP_ANONYMOUS)) {
57 file = fget(fd);
58 if (!file)
59 goto out;
60 }
61
62 down_write(¤t->mm->mmap_sem);
63 error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
64 up_write(¤t->mm->mmap_sem);
65
66 if (file)
67 fput(file);
68 out:
69 return error;
70 }
71
72 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
73 unsigned long prot, unsigned long flags,
74 unsigned long fd, unsigned long pgoff)
75 {
76 return do_mmap2(addr, len, prot, flags, fd, pgoff);
77 }
78
79 /*
80 * Perform the select(nd, in, out, ex, tv) and mmap() system
81 * calls. Linux/m68k cloned Linux/i386, which didn't use to be able to
82 * handle more than 4 system call parameters, so these system calls
83 * used a memory block for parameter passing..
84 */
85
86 struct mmap_arg_struct {
87 unsigned long addr;
88 unsigned long len;
89 unsigned long prot;
90 unsigned long flags;
91 unsigned long fd;
92 unsigned long offset;
93 };
94
95 asmlinkage int old_mmap(struct mmap_arg_struct *arg)
96 {
97 struct mmap_arg_struct a;
98 int error = -EFAULT;
99
100 if (copy_from_user(&a, arg, sizeof(a)))
101 goto out;
102
103 error = -EINVAL;
104 if (a.offset & ~PAGE_MASK)
105 goto out;
106
107 a.flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
108
109 error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
110 out:
111 return error;
112 }
113
114 #if 0
115 struct mmap_arg_struct64 {
116 __u32 addr;
117 __u32 len;
118 __u32 prot;
119 __u32 flags;
120 __u64 offset; /* 64 bits */
121 __u32 fd;
122 };
123
124 asmlinkage long sys_mmap64(struct mmap_arg_struct64 *arg)
125 {
126 int error = -EFAULT;
127 struct file * file = NULL;
128 struct mmap_arg_struct64 a;
129 unsigned long pgoff;
130
131 if (copy_from_user(&a, arg, sizeof(a)))
132 return -EFAULT;
133
134 if ((long)a.offset & ~PAGE_MASK)
135 return -EINVAL;
136
137 pgoff = a.offset >> PAGE_SHIFT;
138 if ((a.offset >> PAGE_SHIFT) != pgoff)
139 return -EINVAL;
140
141 if (!(a.flags & MAP_ANONYMOUS)) {
142 error = -EBADF;
143 file = fget(a.fd);
144 if (!file)
145 goto out;
146 }
147 a.flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
148
149 down_write(¤t->mm->mmap_sem);
150 error = do_mmap_pgoff(file, a.addr, a.len, a.prot, a.flags, pgoff);
151 up_write(¤t->mm->mmap_sem);
152 if (file)
153 fput(file);
154 out:
155 return error;
156 }
157 #endif
158
159 extern asmlinkage int sys_select(int, fd_set *, fd_set *, fd_set *, struct timeval *);
160
161 struct sel_arg_struct {
162 unsigned long n;
163 fd_set *inp, *outp, *exp;
164 struct timeval *tvp;
165 };
166
167 asmlinkage int old_select(struct sel_arg_struct *arg)
168 {
169 struct sel_arg_struct a;
170
171 if (copy_from_user(&a, arg, sizeof(a)))
172 return -EFAULT;
173 /* sys_select() does the appropriate kernel locking */
174 return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
175 }
176
177 /*
178 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
179 *
180 * This is really horribly ugly.
181 */
182 asmlinkage int sys_ipc (uint call, int first, int second,
183 int third, void *ptr, long fifth)
184 {
185 int version, ret;
186
187 version = call >> 16; /* hack for backward compatibility */
188 call &= 0xffff;
189
190 if (call <= SEMCTL)
191 switch (call) {
192 case SEMOP:
193 return sys_semop (first, (struct sembuf *)ptr, second);
194 case SEMGET:
195 return sys_semget (first, second, third);
196 case SEMCTL: {
197 union semun fourth;
198 if (!ptr)
199 return -EINVAL;
200 if (get_user(fourth.__pad, (void **) ptr))
201 return -EFAULT;
202 return sys_semctl (first, second, third, fourth);
203 }
204 default:
205 return -EINVAL;
206 }
207 if (call <= MSGCTL)
208 switch (call) {
209 case MSGSND:
210 return sys_msgsnd (first, (struct msgbuf *) ptr,
211 second, third);
212 case MSGRCV:
213 switch (version) {
214 case 0: {
215 struct ipc_kludge tmp;
216 if (!ptr)
217 return -EINVAL;
218 if (copy_from_user (&tmp,
219 (struct ipc_kludge *)ptr,
220 sizeof (tmp)))
221 return -EFAULT;
222 return sys_msgrcv (first, tmp.msgp, second,
223 tmp.msgtyp, third);
224 }
225 default:
226 return sys_msgrcv (first,
227 (struct msgbuf *) ptr,
228 second, fifth, third);
229 }
230 case MSGGET:
231 return sys_msgget ((key_t) first, second);
232 case MSGCTL:
233 return sys_msgctl (first, second,
234 (struct msqid_ds *) ptr);
235 default:
236 return -EINVAL;
237 }
238 if (call <= SHMCTL)
239 switch (call) {
240 case SHMAT:
241 switch (version) {
242 default: {
243 ulong raddr;
244 ret = sys_shmat (first, (char *) ptr,
245 second, &raddr);
246 if (ret)
247 return ret;
248 return put_user (raddr, (ulong *) third);
249 }
250 }
251 case SHMDT:
252 return sys_shmdt ((char *)ptr);
253 case SHMGET:
254 return sys_shmget (first, second, third);
255 case SHMCTL:
256 return sys_shmctl (first, second,
257 (struct shmid_ds *) ptr);
258 default:
259 return -EINVAL;
260 }
261
262 return -EINVAL;
263 }
264
265 asmlinkage int sys_ioperm(unsigned long from, unsigned long num, int on)
266 {
267 return -ENOSYS;
268 }
269
270
271 /* Convert virtual (user) address VADDR to physical address PADDR */
272 #define virt_to_phys_040(vaddr) \
273 ({ \
274 unsigned long _mmusr, _paddr; \
275 \
276 __asm__ __volatile__ (".chip 68040\n\t" \
277 "ptestr (%1)\n\t" \
278 "movec %%mmusr,%0\n\t" \
279 ".chip 68k" \
280 : "=r" (_mmusr) \
281 : "a" (vaddr)); \
282 _paddr = (_mmusr & MMU_R_040) ? (_mmusr & PAGE_MASK) : 0; \
283 _paddr; \
284 })
285
286 static inline int
287 cache_flush_040 (unsigned long addr, int scope, int cache, unsigned long len)
288 {
289 unsigned long paddr, i;
290
291 switch (scope)
292 {
293 case FLUSH_SCOPE_ALL:
294 switch (cache)
295 {
296 case FLUSH_CACHE_DATA:
297 /* This nop is needed for some broken versions of the 68040. */
298 __asm__ __volatile__ ("nop\n\t"
299 ".chip 68040\n\t"
300 "cpusha %dc\n\t"
301 ".chip 68k");
302 break;
303 case FLUSH_CACHE_INSN:
304 __asm__ __volatile__ ("nop\n\t"
305 ".chip 68040\n\t"
306 "cpusha %ic\n\t"
307 ".chip 68k");
308 break;
309 default:
310 case FLUSH_CACHE_BOTH:
311 __asm__ __volatile__ ("nop\n\t"
312 ".chip 68040\n\t"
313 "cpusha %bc\n\t"
314 ".chip 68k");
315 break;
316 }
317 break;
318
319 case FLUSH_SCOPE_LINE:
320 /* Find the physical address of the first mapped page in the
321 address range. */
322 if ((paddr = virt_to_phys_040(addr))) {
323 paddr += addr & ~(PAGE_MASK | 15);
324 len = (len + (addr & 15) + 15) >> 4;
325 } else {
326 unsigned long tmp = PAGE_SIZE - (addr & ~PAGE_MASK);
327
328 if (len <= tmp)
329 return 0;
330 addr += tmp;
331 len -= tmp;
332 tmp = PAGE_SIZE;
333 for (;;)
334 {
335 if ((paddr = virt_to_phys_040(addr)))
336 break;
337 if (len <= tmp)
338 return 0;
339 addr += tmp;
340 len -= tmp;
341 }
342 len = (len + 15) >> 4;
343 }
344 i = (PAGE_SIZE - (paddr & ~PAGE_MASK)) >> 4;
345 while (len--)
346 {
347 switch (cache)
348 {
349 case FLUSH_CACHE_DATA:
350 __asm__ __volatile__ ("nop\n\t"
351 ".chip 68040\n\t"
352 "cpushl %%dc,(%0)\n\t"
353 ".chip 68k"
354 : : "a" (paddr));
355 break;
356 case FLUSH_CACHE_INSN:
357 __asm__ __volatile__ ("nop\n\t"
358 ".chip 68040\n\t"
359 "cpushl %%ic,(%0)\n\t"
360 ".chip 68k"
361 : : "a" (paddr));
362 break;
363 default:
364 case FLUSH_CACHE_BOTH:
365 __asm__ __volatile__ ("nop\n\t"
366 ".chip 68040\n\t"
367 "cpushl %%bc,(%0)\n\t"
368 ".chip 68k"
369 : : "a" (paddr));
370 break;
371 }
372 if (!--i && len)
373 {
374 /*
375 * No need to page align here since it is done by
376 * virt_to_phys_040().
377 */
378 addr += PAGE_SIZE;
379 i = PAGE_SIZE / 16;
380 /* Recompute physical address when crossing a page
381 boundary. */
382 for (;;)
383 {
384 if ((paddr = virt_to_phys_040(addr)))
385 break;
386 if (len <= i)
387 return 0;
388 len -= i;
389 addr += PAGE_SIZE;
390 }
391 }
392 else
393 paddr += 16;
394 }
395 break;
396
397 default:
398 case FLUSH_SCOPE_PAGE:
399 len += (addr & ~PAGE_MASK) + (PAGE_SIZE - 1);
400 for (len >>= PAGE_SHIFT; len--; addr += PAGE_SIZE)
401 {
402 if (!(paddr = virt_to_phys_040(addr)))
403 continue;
404 switch (cache)
405 {
406 case FLUSH_CACHE_DATA:
407 __asm__ __volatile__ ("nop\n\t"
408 ".chip 68040\n\t"
409 "cpushp %%dc,(%0)\n\t"
410 ".chip 68k"
411 : : "a" (paddr));
412 break;
413 case FLUSH_CACHE_INSN:
414 __asm__ __volatile__ ("nop\n\t"
415 ".chip 68040\n\t"
416 "cpushp %%ic,(%0)\n\t"
417 ".chip 68k"
418 : : "a" (paddr));
419 break;
420 default:
421 case FLUSH_CACHE_BOTH:
422 __asm__ __volatile__ ("nop\n\t"
423 ".chip 68040\n\t"
424 "cpushp %%bc,(%0)\n\t"
425 ".chip 68k"
426 : : "a" (paddr));
427 break;
428 }
429 }
430 break;
431 }
432 return 0;
433 }
434
435 #define virt_to_phys_060(vaddr) \
436 ({ \
437 unsigned long paddr; \
438 __asm__ __volatile__ (".chip 68060\n\t" \
439 "plpar (%0)\n\t" \
440 ".chip 68k" \
441 : "=a" (paddr) \
442 : "0" (vaddr)); \
443 (paddr); /* XXX */ \
444 })
445
446 static inline int
447 cache_flush_060 (unsigned long addr, int scope, int cache, unsigned long len)
448 {
449 unsigned long paddr, i;
450
451 /*
452 * 68060 manual says:
453 * cpush %dc : flush DC, remains valid (with our %cacr setup)
454 * cpush %ic : invalidate IC
455 * cpush %bc : flush DC + invalidate IC
456 */
457 switch (scope)
458 {
459 case FLUSH_SCOPE_ALL:
460 switch (cache)
461 {
462 case FLUSH_CACHE_DATA:
463 __asm__ __volatile__ (".chip 68060\n\t"
464 "cpusha %dc\n\t"
465 ".chip 68k");
466 break;
467 case FLUSH_CACHE_INSN:
468 __asm__ __volatile__ (".chip 68060\n\t"
469 "cpusha %ic\n\t"
470 ".chip 68k");
471 break;
472 default:
473 case FLUSH_CACHE_BOTH:
474 __asm__ __volatile__ (".chip 68060\n\t"
475 "cpusha %bc\n\t"
476 ".chip 68k");
477 break;
478 }
479 break;
480
481 case FLUSH_SCOPE_LINE:
482 /* Find the physical address of the first mapped page in the
483 address range. */
484 len += addr & 15;
485 addr &= -16;
486 if (!(paddr = virt_to_phys_060(addr))) {
487 unsigned long tmp = PAGE_SIZE - (addr & ~PAGE_MASK);
488
489 if (len <= tmp)
490 return 0;
491 addr += tmp;
492 len -= tmp;
493 tmp = PAGE_SIZE;
494 for (;;)
495 {
496 if ((paddr = virt_to_phys_060(addr)))
497 break;
498 if (len <= tmp)
499 return 0;
500 addr += tmp;
501 len -= tmp;
502 }
503 }
504 len = (len + 15) >> 4;
505 i = (PAGE_SIZE - (paddr & ~PAGE_MASK)) >> 4;
506 while (len--)
507 {
508 switch (cache)
509 {
510 case FLUSH_CACHE_DATA:
511 __asm__ __volatile__ (".chip 68060\n\t"
512 "cpushl %%dc,(%0)\n\t"
513 ".chip 68k"
514 : : "a" (paddr));
515 break;
516 case FLUSH_CACHE_INSN:
517 __asm__ __volatile__ (".chip 68060\n\t"
518 "cpushl %%ic,(%0)\n\t"
519 ".chip 68k"
520 : : "a" (paddr));
521 break;
522 default:
523 case FLUSH_CACHE_BOTH:
524 __asm__ __volatile__ (".chip 68060\n\t"
525 "cpushl %%bc,(%0)\n\t"
526 ".chip 68k"
527 : : "a" (paddr));
528 break;
529 }
530 if (!--i && len)
531 {
532
533 /*
534 * We just want to jump to the first cache line
535 * in the next page.
536 */
537 addr += PAGE_SIZE;
538 addr &= PAGE_MASK;
539
540 i = PAGE_SIZE / 16;
541 /* Recompute physical address when crossing a page
542 boundary. */
543 for (;;)
544 {
545 if ((paddr = virt_to_phys_060(addr)))
546 break;
547 if (len <= i)
548 return 0;
549 len -= i;
550 addr += PAGE_SIZE;
551 }
552 }
553 else
554 paddr += 16;
555 }
556 break;
557
558 default:
559 case FLUSH_SCOPE_PAGE:
560 len += (addr & ~PAGE_MASK) + (PAGE_SIZE - 1);
561 addr &= PAGE_MASK; /* Workaround for bug in some
562 revisions of the 68060 */
563 for (len >>= PAGE_SHIFT; len--; addr += PAGE_SIZE)
564 {
565 if (!(paddr = virt_to_phys_060(addr)))
566 continue;
567 switch (cache)
568 {
569 case FLUSH_CACHE_DATA:
570 __asm__ __volatile__ (".chip 68060\n\t"
571 "cpushp %%dc,(%0)\n\t"
572 ".chip 68k"
573 : : "a" (paddr));
574 break;
575 case FLUSH_CACHE_INSN:
576 __asm__ __volatile__ (".chip 68060\n\t"
577 "cpushp %%ic,(%0)\n\t"
578 ".chip 68k"
579 : : "a" (paddr));
580 break;
581 default:
582 case FLUSH_CACHE_BOTH:
583 __asm__ __volatile__ (".chip 68060\n\t"
584 "cpushp %%bc,(%0)\n\t"
585 ".chip 68k"
586 : : "a" (paddr));
587 break;
588 }
589 }
590 break;
591 }
592 return 0;
593 }
594
595 /* sys_cacheflush -- flush (part of) the processor cache. */
596 asmlinkage int
597 sys_cacheflush (unsigned long addr, int scope, int cache, unsigned long len)
598 {
599 struct vm_area_struct *vma;
600 int ret = -EINVAL;
601
602 lock_kernel();
603 if (scope < FLUSH_SCOPE_LINE || scope > FLUSH_SCOPE_ALL ||
604 cache & ~FLUSH_CACHE_BOTH)
605 goto out;
606
607 if (scope == FLUSH_SCOPE_ALL) {
608 /* Only the superuser may explicitly flush the whole cache. */
609 ret = -EPERM;
610 if (!capable(CAP_SYS_ADMIN))
611 goto out;
612 } else {
613 /*
614 * Verify that the specified address region actually belongs
615 * to this process.
616 */
617 vma = find_vma (current->mm, addr);
618 ret = -EINVAL;
619 /* Check for overflow. */
620 if (addr + len < addr)
621 goto out;
622 if (vma == NULL || addr < vma->vm_start || addr + len > vma->vm_end)
623 goto out;
624 }
625
626 if (CPU_IS_020_OR_030) {
627 if (scope == FLUSH_SCOPE_LINE && len < 256) {
628 unsigned long cacr;
629 __asm__ ("movec %%cacr, %0" : "=r" (cacr));
630 if (cache & FLUSH_CACHE_INSN)
631 cacr |= 4;
632 if (cache & FLUSH_CACHE_DATA)
633 cacr |= 0x400;
634 len >>= 2;
635 while (len--) {
636 __asm__ __volatile__ ("movec %1, %%caar\n\t"
637 "movec %0, %%cacr"
638 : /* no outputs */
639 : "r" (cacr), "r" (addr));
640 addr += 4;
641 }
642 } else {
643 /* Flush the whole cache, even if page granularity requested. */
644 unsigned long cacr;
645 __asm__ ("movec %%cacr, %0" : "=r" (cacr));
646 if (cache & FLUSH_CACHE_INSN)
647 cacr |= 8;
648 if (cache & FLUSH_CACHE_DATA)
649 cacr |= 0x800;
650 __asm__ __volatile__ ("movec %0, %%cacr" : : "r" (cacr));
651 }
652 ret = 0;
653 goto out;
654 } else {
655 /*
656 * 040 or 060: don't blindly trust 'scope', someone could
657 * try to flush a few megs of memory.
658 */
659
660 if (len>=3*PAGE_SIZE && scope<FLUSH_SCOPE_PAGE)
661 scope=FLUSH_SCOPE_PAGE;
662 if (len>=10*PAGE_SIZE && scope<FLUSH_SCOPE_ALL)
663 scope=FLUSH_SCOPE_ALL;
664 if (CPU_IS_040) {
665 ret = cache_flush_040 (addr, scope, cache, len);
666 } else if (CPU_IS_060) {
667 ret = cache_flush_060 (addr, scope, cache, len);
668 }
669 }
670 out:
671 unlock_kernel();
672 return ret;
673 }
674
675 asmlinkage int sys_getpagesize(void)
676 {
677 return PAGE_SIZE;
678 }
679
680 /*
681 * Old cruft
682 */
683 asmlinkage int sys_pause(void)
684 {
685 current->state = TASK_INTERRUPTIBLE;
686 schedule();
687 return -ERESTARTNOHAND;
688 }
689