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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /arch/tile/mm/migrate.h
Initial import
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+/*
+ * Copyright 2010 Tilera Corporation. All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, version 2.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ * NON INFRINGEMENT. See the GNU General Public License for
+ * more details.
+ *
+ * Structure definitions for migration, exposed here for use by
+ * arch/tile/kernel/asm-offsets.c.
+ */
+
+#ifndef MM_MIGRATE_H
+#define MM_MIGRATE_H
+
+#include <linux/cpumask.h>
+#include <hv/hypervisor.h>
+
+/*
+ * This function is used as a helper when setting up the initial
+ * page table (swapper_pg_dir).
+ *
+ * You must mask ALL interrupts prior to invoking this code, since
+ * you can't legally touch the stack during the cache flush.
+ */
+extern int flush_and_install_context(HV_PhysAddr page_table, HV_PTE access,
+ HV_ASID asid,
+ const unsigned long *cpumask);
+
+/*
+ * This function supports migration as a "helper" as follows:
+ *
+ * - Set the stack PTE itself to "migrating".
+ * - Do a global TLB flush for (va,length) and the specified ASIDs.
+ * - Do a cache-evict on all necessary cpus.
+ * - Write the new stack PTE.
+ *
+ * Note that any non-NULL pointers must not point to the page that
+ * is handled by the stack_pte itself.
+ *
+ * You must mask ALL interrupts prior to invoking this code, since
+ * you can't legally touch the stack during the cache flush.
+ */
+extern int homecache_migrate_stack_and_flush(pte_t stack_pte, unsigned long va,
+ size_t length, pte_t *stack_ptep,
+ const struct cpumask *cache_cpumask,
+ const struct cpumask *tlb_cpumask,
+ HV_Remote_ASID *asids,
+ int asidcount);
+
+#endif /* MM_MIGRATE_H */