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(&current->mm->mmap_sem);
  63         error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
  64         up_write(&current->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(&current->mm->mmap_sem);
 150         error = do_mmap_pgoff(file, a.addr, a.len, a.prot, a.flags, pgoff);
 151         up_write(&current->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 }