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/*
* Switch a MMU context.
*
* 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 by Ralf Baechle
*/
#ifndef __ASM_MIPS_MMU_CONTEXT_H
#define __ASM_MIPS_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_MIPS_MMU_CONTEXT_H */
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