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Chris Metcalf867e3592010-05-28 23:09:12 -04001/*
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).
Chris Metcalf51007002012-03-27 15:40:20 -040027 *
28 * You must mask ALL interrupts prior to invoking this code, since
29 * you can't legally touch the stack during the cache flush.
Chris Metcalf867e3592010-05-28 23:09:12 -040030 */
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.
Chris Metcalf51007002012-03-27 15:40:20 -040045 *
46 * You must mask ALL interrupts prior to invoking this code, since
47 * you can't legally touch the stack during the cache flush.
Chris Metcalf867e3592010-05-28 23:09:12 -040048 */
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 */