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