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Diffstat (limited to 'include/asm-mips64/mmu_context.h')
| -rw-r--r-- | include/asm-mips64/mmu_context.h | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/include/asm-mips64/mmu_context.h b/include/asm-mips64/mmu_context.h new file mode 100644 index 000000000..70f3bab5d --- /dev/null +++ b/include/asm-mips64/mmu_context.h @@ -0,0 +1,64 @@ +/* $Id$ + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 1996 - 1999 by Ralf Baechle + */ +#ifndef _ASM_MMU_CONTEXT_H +#define _ASM_MMU_CONTEXT_H + +#define MAX_ASID 255 + +extern unsigned long asid_cache; + +#define ASID_VERSION_SHIFT 16 +#define ASID_VERSION_MASK ((~0UL) << ASID_VERSION_SHIFT) +#define ASID_FIRST_VERSION (1UL << ASID_VERSION_SHIFT) + +extern inline void get_new_mmu_context(struct mm_struct *mm, unsigned long asid) +{ + /* check if it's legal.. */ + if ((asid & ~ASID_VERSION_MASK) > MAX_ASID) { + /* start a new version, invalidate all old asid's */ + flush_tlb_all(); + asid = (asid & ASID_VERSION_MASK) + ASID_FIRST_VERSION; + if (!asid) + asid = ASID_FIRST_VERSION; + } + asid_cache = asid + 1; + mm->context = asid; /* full version + asid */ +} + +extern inline void get_mmu_context(struct task_struct *p) +{ + struct mm_struct *mm = p->mm; + + if (mm) { + unsigned long asid = asid_cache; + /* Check if our ASID is of an older version and thus invalid */ + if ((mm->context ^ asid) & ASID_VERSION_MASK) + get_new_mmu_context(mm, asid); + } +} + +/* + * Initialize the context related info for a new mm_struct + * instance. + */ +extern inline void init_new_context(struct mm_struct *mm) +{ + mm->context = 0; +} + +/* + * Destroy context related info for an mm_struct that is about + * to be put to rest. + */ +extern inline void destroy_context(struct mm_struct *mm) +{ + mm->context = 0; +} + +#endif /* _ASM_MMU_CONTEXT_H */ |