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