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(¤t->mm->mmap_sem);
63 error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
64 up(¤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(¤t->mm->mmap_sem);
150 error = do_mmap_pgoff(file, a.addr, a.len, a.prot, a.flags, pgoff);
151 up(¤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 /* Convert virtual address VADDR to physical address PADDR */
271 #define virt_to_phys_040(vaddr) \
272 ({ \
273 unsigned long _mmusr, _paddr; \
274 \
275 __asm__ __volatile__ (".chip 68040\n\t" \
276 "ptestr (%1)\n\t" \
277 "movec %%mmusr,%0\n\t" \
278 ".chip 68k" \
279 : "=r" (_mmusr) \
280 : "a" (vaddr)); \
281 _paddr = (_mmusr & MMU_R_040) ? (_mmusr & PAGE_MASK) : 0; \
282 _paddr; \
283 })
284
285 static inline int
286 cache_flush_040 (unsigned long addr, int scope, int cache, unsigned long len)
287 {
288 unsigned long paddr, i;
289
290 switch (scope)
291 {
292 case FLUSH_SCOPE_ALL:
293 switch (cache)
294 {
295 case FLUSH_CACHE_DATA:
296 /* This nop is needed for some broken versions of the 68040. */
297 __asm__ __volatile__ ("nop\n\t"
298 ".chip 68040\n\t"
299 "cpusha %dc\n\t"
300 ".chip 68k");
301 break;
302 case FLUSH_CACHE_INSN:
303 __asm__ __volatile__ ("nop\n\t"
304 ".chip 68040\n\t"
305 "cpusha %ic\n\t"
306 ".chip 68k");
307 break;
308 default:
309 case FLUSH_CACHE_BOTH:
310 __asm__ __volatile__ ("nop\n\t"
311 ".chip 68040\n\t"
312 "cpusha %bc\n\t"
313 ".chip 68k");
314 break;
315 }
316 break;
317
318 case FLUSH_SCOPE_LINE:
319 /* Find the physical address of the first mapped page in the
320 address range. */
321 if ((paddr = virt_to_phys_040(addr))) {
322 paddr += addr & ~(PAGE_MASK | 15);
323 len = (len + (addr & 15) + 15) >> 4;
324 } else {
325 unsigned long tmp = PAGE_SIZE - (addr & ~PAGE_MASK);
326
327 if (len <= tmp)
328 return 0;
329 addr += tmp;
330 len -= tmp;
331 tmp = PAGE_SIZE;
332 for (;;)
333 {
334 if ((paddr = virt_to_phys_040(addr)))
335 break;
336 if (len <= tmp)
337 return 0;
338 addr += tmp;
339 len -= tmp;
340 }
341 len = (len + 15) >> 4;
342 }
343 i = (PAGE_SIZE - (paddr & ~PAGE_MASK)) >> 4;
344 while (len--)
345 {
346 switch (cache)
347 {
348 case FLUSH_CACHE_DATA:
349 __asm__ __volatile__ ("nop\n\t"
350 ".chip 68040\n\t"
351 "cpushl %%dc,(%0)\n\t"
352 ".chip 68k"
353 : : "a" (paddr));
354 break;
355 case FLUSH_CACHE_INSN:
356 __asm__ __volatile__ ("nop\n\t"
357 ".chip 68040\n\t"
358 "cpushl %%ic,(%0)\n\t"
359 ".chip 68k"
360 : : "a" (paddr));
361 break;
362 default:
363 case FLUSH_CACHE_BOTH:
364 __asm__ __volatile__ ("nop\n\t"
365 ".chip 68040\n\t"
366 "cpushl %%bc,(%0)\n\t"
367 ".chip 68k"
368 : : "a" (paddr));
369 break;
370 }
371 if (!--i && len)
372 {
373 /*
374 * No need to page align here since it is done by
375 * virt_to_phys_040().
376 */
377 addr += PAGE_SIZE;
378 i = PAGE_SIZE / 16;
379 /* Recompute physical address when crossing a page
380 boundary. */
381 for (;;)
382 {
383 if ((paddr = virt_to_phys_040(addr)))
384 break;
385 if (len <= i)
386 return 0;
387 len -= i;
388 addr += PAGE_SIZE;
389 }
390 }
391 else
392 paddr += 16;
393 }
394 break;
395
396 default:
397 case FLUSH_SCOPE_PAGE:
398 len += (addr & ~PAGE_MASK) + (PAGE_SIZE - 1);
399 for (len >>= PAGE_SHIFT; len--; addr += PAGE_SIZE)
400 {
401 if (!(paddr = virt_to_phys_040(addr)))
402 continue;
403 switch (cache)
404 {
405 case FLUSH_CACHE_DATA:
406 __asm__ __volatile__ ("nop\n\t"
407 ".chip 68040\n\t"
408 "cpushp %%dc,(%0)\n\t"
409 ".chip 68k"
410 : : "a" (paddr));
411 break;
412 case FLUSH_CACHE_INSN:
413 __asm__ __volatile__ ("nop\n\t"
414 ".chip 68040\n\t"
415 "cpushp %%ic,(%0)\n\t"
416 ".chip 68k"
417 : : "a" (paddr));
418 break;
419 default:
420 case FLUSH_CACHE_BOTH:
421 __asm__ __volatile__ ("nop\n\t"
422 ".chip 68040\n\t"
423 "cpushp %%bc,(%0)\n\t"
424 ".chip 68k"
425 : : "a" (paddr));
426 break;
427 }
428 }
429 break;
430 }
431 return 0;
432 }
433
434 #define virt_to_phys_060(vaddr) \
435 ({ \
436 unsigned long paddr; \
437 __asm__ __volatile__ (".chip 68060\n\t" \
438 "plpar (%0)\n\t" \
439 ".chip 68k" \
440 : "=a" (paddr) \
441 : "" (vaddr)); \
442 (paddr); /* XXX */ \
443 })
444
445 static inline int
446 cache_flush_060 (unsigned long addr, int scope, int cache, unsigned long len)
447 {
448 unsigned long paddr, i;
449
450 switch (scope)
451 {
452 case FLUSH_SCOPE_ALL:
453 switch (cache)
454 {
455 case FLUSH_CACHE_DATA:
456 __asm__ __volatile__ (".chip 68060\n\t"
457 "cpusha %dc\n\t"
458 "cinva %dc\n\t"
459 ".chip 68k");
460 break;
461 case FLUSH_CACHE_INSN:
462 __asm__ __volatile__ (".chip 68060\n\t"
463 "cpusha %ic\n\t"
464 "cinva %ic\n\t"
465 ".chip 68k");
466 break;
467 default:
468 case FLUSH_CACHE_BOTH:
469 __asm__ __volatile__ (".chip 68060\n\t"
470 "cpusha %bc\n\t"
471 "cinva %bc\n\t"
472 ".chip 68k");
473 break;
474 }
475 break;
476
477 case FLUSH_SCOPE_LINE:
478 /* Find the physical address of the first mapped page in the
479 address range. */
480 len += addr & 15;
481 addr &= -16;
482 if (!(paddr = virt_to_phys_060(addr))) {
483 unsigned long tmp = PAGE_SIZE - (addr & ~PAGE_MASK);
484
485 if (len <= tmp)
486 return 0;
487 addr += tmp;
488 len -= tmp;
489 tmp = PAGE_SIZE;
490 for (;;)
491 {
492 if ((paddr = virt_to_phys_060(addr)))
493 break;
494 if (len <= tmp)
495 return 0;
496 addr += tmp;
497 len -= tmp;
498 }
499 }
500 len = (len + 15) >> 4;
501 i = (PAGE_SIZE - (paddr & ~PAGE_MASK)) >> 4;
502 while (len--)
503 {
504 switch (cache)
505 {
506 case FLUSH_CACHE_DATA:
507 __asm__ __volatile__ (".chip 68060\n\t"
508 "cpushl %%dc,(%0)\n\t"
509 "cinvl %%dc,(%0)\n\t"
510 ".chip 68k"
511 : : "a" (paddr));
512 break;
513 case FLUSH_CACHE_INSN:
514 __asm__ __volatile__ (".chip 68060\n\t"
515 "cpushl %%ic,(%0)\n\t"
516 "cinvl %%ic,(%0)\n\t"
517 ".chip 68k"
518 : : "a" (paddr));
519 break;
520 default:
521 case FLUSH_CACHE_BOTH:
522 __asm__ __volatile__ (".chip 68060\n\t"
523 "cpushl %%bc,(%0)\n\t"
524 "cinvl %%bc,(%0)\n\t"
525 ".chip 68k"
526 : : "a" (paddr));
527 break;
528 }
529 if (!--i && len)
530 {
531
532 /*
533 * We just want to jump to the first cache line
534 * in the next page.
535 */
536 addr += PAGE_SIZE;
537 addr &= PAGE_MASK;
538
539 i = PAGE_SIZE / 16;
540 /* Recompute physical address when crossing a page
541 boundary. */
542 for (;;)
543 {
544 if ((paddr = virt_to_phys_060(addr)))
545 break;
546 if (len <= i)
547 return 0;
548 len -= i;
549 addr += PAGE_SIZE;
550 }
551 }
552 else
553 paddr += 16;
554 }
555 break;
556
557 default:
558 case FLUSH_SCOPE_PAGE:
559 len += (addr & ~PAGE_MASK) + (PAGE_SIZE - 1);
560 addr &= PAGE_MASK; /* Workaround for bug in some
561 revisions of the 68060 */
562 for (len >>= PAGE_SHIFT; len--; addr += PAGE_SIZE)
563 {
564 if (!(paddr = virt_to_phys_060(addr)))
565 continue;
566 switch (cache)
567 {
568 case FLUSH_CACHE_DATA:
569 __asm__ __volatile__ (".chip 68060\n\t"
570 "cpushp %%dc,(%0)\n\t"
571 "cinvp %%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 "cinvp %%ic,(%0)\n\t"
579 ".chip 68k"
580 : : "a" (paddr));
581 break;
582 default:
583 case FLUSH_CACHE_BOTH:
584 __asm__ __volatile__ (".chip 68060\n\t"
585 "cpushp %%bc,(%0)\n\t"
586 "cinvp %%bc,(%0)\n\t"
587 ".chip 68k"
588 : : "a" (paddr));
589 break;
590 }
591 }
592 break;
593 }
594 return 0;
595 }
596
597 /* sys_cacheflush -- flush (part of) the processor cache. */
598 asmlinkage int
599 sys_cacheflush (unsigned long addr, int scope, int cache, unsigned long len)
600 {
601 struct vm_area_struct *vma;
602 int ret = -EINVAL;
603
604 lock_kernel();
605 if (scope < FLUSH_SCOPE_LINE || scope > FLUSH_SCOPE_ALL ||
606 cache & ~FLUSH_CACHE_BOTH)
607 goto out;
608
609 if (scope == FLUSH_SCOPE_ALL) {
610 /* Only the superuser may flush the whole cache. */
611 ret = -EPERM;
612 if (!capable(CAP_SYS_ADMIN))
613 goto out;
614 } else {
615 /* Verify that the specified address region actually belongs to
616 * this process.
617 */
618 vma = find_vma (current->mm, addr);
619 ret = -EINVAL;
620 /* Check for overflow. */
621 if (addr + len < addr)
622 goto out;
623 if (vma == NULL || addr < vma->vm_start || addr + len > vma->vm_end)
624 goto out;
625 }
626
627 if (CPU_IS_020_OR_030) {
628 if (scope == FLUSH_SCOPE_LINE && len < 256) {
629 unsigned long cacr;
630 __asm__ ("movec %%cacr, %0" : "=r" (cacr));
631 if (cache & FLUSH_CACHE_INSN)
632 cacr |= 4;
633 if (cache & FLUSH_CACHE_DATA)
634 cacr |= 0x400;
635 len >>= 2;
636 while (len--) {
637 __asm__ __volatile__ ("movec %1, %%caar\n\t"
638 "movec %0, %%cacr"
639 : /* no outputs */
640 : "r" (cacr), "r" (addr));
641 addr += 4;
642 }
643 } else {
644 /* Flush the whole cache, even if page granularity requested. */
645 unsigned long cacr;
646 __asm__ ("movec %%cacr, %0" : "=r" (cacr));
647 if (cache & FLUSH_CACHE_INSN)
648 cacr |= 8;
649 if (cache & FLUSH_CACHE_DATA)
650 cacr |= 0x800;
651 __asm__ __volatile__ ("movec %0, %%cacr" : : "r" (cacr));
652 }
653 ret = 0;
654 goto out;
655 } else if (CPU_IS_040) {
656 ret = cache_flush_040 (addr, scope, cache, len);
657 } else if (CPU_IS_060) {
658 ret = cache_flush_060 (addr, scope, cache, len);
659 }
660 out:
661 unlock_kernel();
662 return ret;
663 }
664
665 asmlinkage int sys_getpagesize(void)
666 {
667 return PAGE_SIZE;
668 }
669
670 /*
671 * Old cruft
672 */
673 asmlinkage int sys_pause(void)
674 {
675 current->state = TASK_INTERRUPTIBLE;
676 schedule();
677 return -ERESTARTNOHAND;
678 }
679
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