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  * You must mask ALL interrupts prior to invoking this code, since
  29  * you can't legally touch the stack during the cache flush.
  30  */
  31 extern int flush_and_install_context(HV_PhysAddr page_table, HV_PTE access,
  32                                      HV_ASID asid,
  33                                      const unsigned long *cpumask);
  34
  35 /*
  36  * This function supports migration as a "helper" as follows:
  37  *
  38  *  - Set the stack PTE itself to "migrating".
  39  *  - Do a global TLB flush for (va,length) and the specified ASIDs.
  40  *  - Do a cache-evict on all necessary cpus.
  41  *  - Write the new stack PTE.
  42  *
  43  * Note that any non-NULL pointers must not point to the page that
  44  * is handled by the stack_pte itself.
  45  *
  46  * You must mask ALL interrupts prior to invoking this code, since
  47  * you can't legally touch the stack during the cache flush.
  48  */
  49 extern int homecache_migrate_stack_and_flush(pte_t stack_pte, unsigned long va,
  50                                      size_t length, pte_t *stack_ptep,
  51                                      const struct cpumask *cache_cpumask,
  52                                      const struct cpumask *tlb_cpumask,
  53                                      HV_Remote_ASID *asids,
  54                                      int asidcount);
  55
  56 #endif /* MM_MIGRATE_H */