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/* $Id: mmu_context.h,v 1.3 1998/10/16 19:22:54 ralf Exp $
*
* 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, 1997, 1998 by Ralf Baechle
*/
#ifndef __ASM_MIPS_MMU_CONTEXT_H
#define __ASM_MIPS_MMU_CONTEXT_H
/* Fuck. The f-word is here so you can grep for it :-) */
extern unsigned long asid_cache;
/* I patch, therefore I am ... */
#define ASID_INC(asid) \
({ unsigned long __asid = asid; \
__asm__("1:\taddiu\t%0,0\t\t\t\t# patched\n\t" \
".section\t__asid_inc,\"a\"\n\t" \
".word\t1b\n\t" \
".previous" \
:"=r" (__asid) \
:"0" (__asid)); \
__asid; })
#define ASID_MASK(asid) \
({ unsigned long __asid = asid; \
__asm__("1:\tandi\t%0,%1,0\t\t\t# patched\n\t" \
".section\t__asid_mask,\"a\"\n\t" \
".word\t1b\n\t" \
".previous" \
:"=r" (__asid) \
:"r" (__asid)); \
__asid; })
#define ASID_VERSION_MASK \
({ unsigned long __asid; \
__asm__("1:\tli\t%0,0\t\t\t\t# patched\n\t" \
".section\t__asid_version_mask,\"a\"\n\t" \
".word\t1b\n\t" \
".previous" \
:"=r" (__asid)); \
__asid; })
#define ASID_FIRST_VERSION \
({ unsigned long __asid = asid; \
__asm__("1:\tli\t%0,0\t\t\t\t# patched\n\t" \
".section\t__asid_first_version,\"a\"\n\t" \
".word\t1b\n\t" \
".previous" \
:"=r" (__asid)); \
__asid; })
#define ASID_FIRST_VERSION_R3000 0x1000
#define ASID_FIRST_VERSION_R4000 0x100
extern inline void
get_new_mmu_context(struct mm_struct *mm, unsigned long asid)
{
if (!ASID_MASK((asid = ASID_INC(asid)))) {
flush_tlb_all(); /* start new asid cycle */
if (!asid) /* fix version if needed */
asid = ASID_FIRST_VERSION;
}
mm->context = asid_cache = 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;
}
/*
* After we have set current->mm to a new value, this activates
* the context for the new mm so we see the new mappings.
*/
extern inline void activate_context(struct task_struct *tsk)
{
get_mmu_context(tsk);
set_entryhi(tsk->mm->context);
}
extern void __asid_setup(unsigned int inc, unsigned int mask,
unsigned int version_mask, unsigned int first_version);
extern inline void r3000_asid_setup(void)
{
__asid_setup(0x40, 0xfc0, 0xf000, ASID_FIRST_VERSION_R3000);
}
extern inline void r6000_asid_setup(void)
{
panic("r6000_asid_setup: implement me"); /* No idea ... */
}
extern inline void tfp_asid_setup(void)
{
panic("tfp_asid_setup: implement me"); /* No idea ... */
}
extern inline void r4xx0_asid_setup(void)
{
__asid_setup(1, 0xff, 0xff00, ASID_FIRST_VERSION_R4000);
}
/* R10000 has the same ASID mechanism as the R4000. */
#define andes_asid_setup r4xx0_asid_setup
#endif /* __ASM_MIPS_MMU_CONTEXT_H */
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