arch/tile/include/uapi/asm/cachectl.h

   1 /*
   2  * Copyright 2011 Tilera Corporation. All Rights Reserved.
   3  *
   4  *   This program is free software; you can redistribute it and/or
   5  *   modify it under the terms of the GNU General Public License
   6  *   as published by the Free Software Foundation, version 2.
   7  *
   8  *   This program is distributed in the hope that it will be useful, but
   9  *   WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  11  *   NON INFRINGEMENT.  See the GNU General Public License for
  12  *   more details.
  13  */
  14
  15 #ifndef _ASM_TILE_CACHECTL_H
  16 #define _ASM_TILE_CACHECTL_H
  17
  18 /*
  19  * Options for cacheflush system call.
  20  *
  21  * The ICACHE flush is performed on all cores currently running the
  22  * current process's address space.  The intent is for user
  23  * applications to be able to modify code, invoke the system call,
  24  * then allow arbitrary other threads in the same address space to see
  25  * the newly-modified code.  Passing a length of CHIP_L1I_CACHE_SIZE()
  26  * or more invalidates the entire icache on all cores in the address
  27  * spaces.  (Note: currently this option invalidates the entire icache
  28  * regardless of the requested address and length, but we may choose
  29  * to honor the arguments at some point.)
  30  *
  31  * Flush and invalidation of memory can normally be performed with the
  32  * __insn_flush(), __insn_inv(), and __insn_finv() instructions from
  33  * userspace.  The DCACHE option to the system call allows userspace
  34  * to flush the entire L1+L2 data cache from the core.  In this case,
  35  * the address and length arguments are not used.  The DCACHE flush is
  36  * restricted to the current core, not all cores in the address space.
  37  */
  38 #define ICACHE  (1<<0)          /* invalidate L1 instruction cache */
  39 #define DCACHE  (1<<1)          /* flush and invalidate data cache */
  40 #define BCACHE  (ICACHE|DCACHE) /* flush both caches               */
  41
  42 #endif  /* _ASM_TILE_CACHECTL_H */