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 */
31extern 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 */
49extern 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 */