arch/tile/mm/migrate.h

   1 /*
   2  * Copyright 2010 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  * Structure definitions for migration, exposed here for use by
  15  * arch/tile/kernel/asm-offsets.c.
  16  */
  17
  18 #ifndef MM_MIGRATE_H
  19 #define MM_MIGRATE_H
  20
  21 #include <linux/cpumask.h>
  22 #include <hv/hypervisor.h>
  23
  24 /*
  25  * This function is used as a helper when setting up the initial
  26  * page table (swapper_pg_dir).
  27  */
  28 extern int flush_and_install_context(HV_PhysAddr page_table, HV_PTE access,
  29                                      HV_ASID asid,
  30                                      const unsigned long *cpumask);
  31
  32 /*
  33  * This function supports migration as a "helper" as follows:
  34  *
  35  *  - Set the stack PTE itself to "migrating".
  36  *  - Do a global TLB flush for (va,length) and the specified ASIDs.
  37  *  - Do a cache-evict on all necessary cpus.
  38  *  - Write the new stack PTE.
  39  *
  40  * Note that any non-NULL pointers must not point to the page that
  41  * is handled by the stack_pte itself.
  42  */
  43 extern int homecache_migrate_stack_and_flush(pte_t stack_pte, unsigned long va,
  44                                      size_t length, pte_t *stack_ptep,
  45                                      const struct cpumask *cache_cpumask,
  46                                      const struct cpumask *tlb_cpumask,
  47                                      HV_Remote_ASID *asids,
  48                                      int asidcount);
  49
  50 #endif /* MM_MIGRATE_H */