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migrate.h
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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 */