arch/arm-linux/exec/cachecleare.c

   1 /*
   2     Copyright © 1995-2010, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: CacheClearE() - Clear the caches with extended control, ARM Linux-hosted implementation
   6     Lang: english
   7 */
   8
   9 #include <exec/execbase.h>
  10 #include <aros/atomic.h>
  11 #include <aros/libcall.h>
  12 #include <proto/exec.h>
  13
  14 #include <aros/debug.h>
  15
  16 AROS_LH3(void, CacheClearE,
  17          AROS_LHA(APTR, address, A0),
  18          AROS_LHA(ULONG, length, D0),
  19          AROS_LHA(ULONG, caches, D1),
  20          struct ExecBase *, SysBase, 107, Exec)
  21 {
  22     AROS_LIBFUNC_INIT
  23
  24     D(bug("CacheClearE(%08x, %08x, %x)\n", address, length, caches));
  25
  26     /* Linux supports only instruction cache flush */
  27     if (caches & CACRF_ClearI)
  28     {
  29         /* Forbid(). We inline it because we could use real executable jumptable,
  30            in this case this function can be called for validating ExecBase
  31            itself. */
  32         AROS_ATOMIC_INC(SysBase->TDNestCnt);
  33
  34         const int syscall = 0xf0002;
  35         __asm __volatile (
  36                 "mov     %%r0, %0\n"
  37                 "mov     %%r1, %1\n"
  38                 "mov     %%r7, %2\n"
  39                 "mov     %%r2, #0x0\n"
  40                 "svc     0x00000000\n"
  41                 :
  42                 :       "r" (address), "r" ((IPTR)address + length), "r" (syscall)
  43                 :       "r0", "r1", "r2", "r7", "memory"
  44                 );
  45
  46         /* It's okay to use library base now */
  47         Permit();
  48     }
  49
  50     AROS_LIBFUNC_EXIT
  51 } /* CacheClearE */