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Diffstat (limited to 'include/asm-mips/mmu_context.h')
-rw-r--r--include/asm-mips/mmu_context.h297
1 files changed, 0 insertions, 297 deletions
diff --git a/include/asm-mips/mmu_context.h b/include/asm-mips/mmu_context.h
deleted file mode 100644
index 0c4f245..0000000
--- a/include/asm-mips/mmu_context.h
+++ /dev/null
@@ -1,297 +0,0 @@
-/*
- * 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, 1999 by Ralf Baechle
- * Copyright (C) 1999 Silicon Graphics, Inc.
- */
-#ifndef _ASM_MMU_CONTEXT_H
-#define _ASM_MMU_CONTEXT_H
-
-#include <linux/errno.h>
-#include <linux/sched.h>
-#include <linux/slab.h>
-#include <asm/cacheflush.h>
-#include <asm/tlbflush.h>
-#ifdef CONFIG_MIPS_MT_SMTC
-#include <asm/mipsmtregs.h>
-#include <asm/smtc.h>
-#endif /* SMTC */
-#include <asm-generic/mm_hooks.h>
-
-/*
- * For the fast tlb miss handlers, we keep a per cpu array of pointers
- * to the current pgd for each processor. Also, the proc. id is stuffed
- * into the context register.
- */
-extern unsigned long pgd_current[];
-
-#define TLBMISS_HANDLER_SETUP_PGD(pgd) \
- pgd_current[smp_processor_id()] = (unsigned long)(pgd)
-
-#ifdef CONFIG_32BIT
-#define TLBMISS_HANDLER_SETUP() \
- write_c0_context((unsigned long) smp_processor_id() << 25); \
- TLBMISS_HANDLER_SETUP_PGD(swapper_pg_dir)
-#endif
-#ifdef CONFIG_64BIT
-#define TLBMISS_HANDLER_SETUP() \
- write_c0_context((unsigned long) smp_processor_id() << 26); \
- TLBMISS_HANDLER_SETUP_PGD(swapper_pg_dir)
-#endif
-
-#if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)
-
-#define ASID_INC 0x40
-#define ASID_MASK 0xfc0
-
-#elif defined(CONFIG_CPU_R8000)
-
-#define ASID_INC 0x10
-#define ASID_MASK 0xff0
-
-#elif defined(CONFIG_CPU_RM9000)
-
-#define ASID_INC 0x1
-#define ASID_MASK 0xfff
-
-/* SMTC/34K debug hack - but maybe we'll keep it */
-#elif defined(CONFIG_MIPS_MT_SMTC)
-
-#define ASID_INC 0x1
-extern unsigned long smtc_asid_mask;
-#define ASID_MASK (smtc_asid_mask)
-#define HW_ASID_MASK 0xff
-/* End SMTC/34K debug hack */
-#else /* FIXME: not correct for R6000 */
-
-#define ASID_INC 0x1
-#define ASID_MASK 0xff
-
-#endif
-
-#define cpu_context(cpu, mm) ((mm)->context[cpu])
-#define cpu_asid(cpu, mm) (cpu_context((cpu), (mm)) & ASID_MASK)
-#define asid_cache(cpu) (cpu_data[cpu].asid_cache)
-
-static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
-{
-}
-
-/*
- * All unused by hardware upper bits will be considered
- * as a software asid extension.
- */
-#define ASID_VERSION_MASK ((unsigned long)~(ASID_MASK|(ASID_MASK-1)))
-#define ASID_FIRST_VERSION ((unsigned long)(~ASID_VERSION_MASK) + 1)
-
-#ifndef CONFIG_MIPS_MT_SMTC
-/* Normal, classic MIPS get_new_mmu_context */
-static inline void
-get_new_mmu_context(struct mm_struct *mm, unsigned long cpu)
-{
- unsigned long asid = asid_cache(cpu);
-
- if (! ((asid += ASID_INC) & ASID_MASK) ) {
- if (cpu_has_vtag_icache)
- flush_icache_all();
- local_flush_tlb_all(); /* start new asid cycle */
- if (!asid) /* fix version if needed */
- asid = ASID_FIRST_VERSION;
- }
- cpu_context(cpu, mm) = asid_cache(cpu) = asid;
-}
-
-#else /* CONFIG_MIPS_MT_SMTC */
-
-#define get_new_mmu_context(mm, cpu) smtc_get_new_mmu_context((mm), (cpu))
-
-#endif /* CONFIG_MIPS_MT_SMTC */
-
-/*
- * Initialize the context related info for a new mm_struct
- * instance.
- */
-static inline int
-init_new_context(struct task_struct *tsk, struct mm_struct *mm)
-{
- int i;
-
- for_each_online_cpu(i)
- cpu_context(i, mm) = 0;
-
- return 0;
-}
-
-static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
- struct task_struct *tsk)
-{
- unsigned int cpu = smp_processor_id();
- unsigned long flags;
-#ifdef CONFIG_MIPS_MT_SMTC
- unsigned long oldasid;
- unsigned long mtflags;
- int mytlb = (smtc_status & SMTC_TLB_SHARED) ? 0 : cpu_data[cpu].vpe_id;
- local_irq_save(flags);
- mtflags = dvpe();
-#else /* Not SMTC */
- local_irq_save(flags);
-#endif /* CONFIG_MIPS_MT_SMTC */
-
- /* Check if our ASID is of an older version and thus invalid */
- if ((cpu_context(cpu, next) ^ asid_cache(cpu)) & ASID_VERSION_MASK)
- get_new_mmu_context(next, cpu);
-#ifdef CONFIG_MIPS_MT_SMTC
- /*
- * If the EntryHi ASID being replaced happens to be
- * the value flagged at ASID recycling time as having
- * an extended life, clear the bit showing it being
- * in use by this "CPU", and if that's the last bit,
- * free up the ASID value for use and flush any old
- * instances of it from the TLB.
- */
- oldasid = (read_c0_entryhi() & ASID_MASK);
- if(smtc_live_asid[mytlb][oldasid]) {
- smtc_live_asid[mytlb][oldasid] &= ~(0x1 << cpu);
- if(smtc_live_asid[mytlb][oldasid] == 0)
- smtc_flush_tlb_asid(oldasid);
- }
- /*
- * Tread softly on EntryHi, and so long as we support
- * having ASID_MASK smaller than the hardware maximum,
- * make sure no "soft" bits become "hard"...
- */
- write_c0_entryhi((read_c0_entryhi() & ~HW_ASID_MASK)
- | (cpu_context(cpu, next) & ASID_MASK));
- ehb(); /* Make sure it propagates to TCStatus */
- evpe(mtflags);
-#else
- write_c0_entryhi(cpu_context(cpu, next));
-#endif /* CONFIG_MIPS_MT_SMTC */
- TLBMISS_HANDLER_SETUP_PGD(next->pgd);
-
- /*
- * Mark current->active_mm as not "active" anymore.
- * We don't want to mislead possible IPI tlb flush routines.
- */
- cpu_clear(cpu, prev->cpu_vm_mask);
- cpu_set(cpu, next->cpu_vm_mask);
-
- local_irq_restore(flags);
-}
-
-/*
- * Destroy context related info for an mm_struct that is about
- * to be put to rest.
- */
-static inline void destroy_context(struct mm_struct *mm)
-{
-}
-
-#define deactivate_mm(tsk, mm) do { } while (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.
- */
-static inline void
-activate_mm(struct mm_struct *prev, struct mm_struct *next)
-{
- unsigned long flags;
- unsigned int cpu = smp_processor_id();
-
-#ifdef CONFIG_MIPS_MT_SMTC
- unsigned long oldasid;
- unsigned long mtflags;
- int mytlb = (smtc_status & SMTC_TLB_SHARED) ? 0 : cpu_data[cpu].vpe_id;
-#endif /* CONFIG_MIPS_MT_SMTC */
-
- local_irq_save(flags);
-
- /* Unconditionally get a new ASID. */
- get_new_mmu_context(next, cpu);
-
-#ifdef CONFIG_MIPS_MT_SMTC
- /* See comments for similar code above */
- mtflags = dvpe();
- oldasid = read_c0_entryhi() & ASID_MASK;
- if(smtc_live_asid[mytlb][oldasid]) {
- smtc_live_asid[mytlb][oldasid] &= ~(0x1 << cpu);
- if(smtc_live_asid[mytlb][oldasid] == 0)
- smtc_flush_tlb_asid(oldasid);
- }
- /* See comments for similar code above */
- write_c0_entryhi((read_c0_entryhi() & ~HW_ASID_MASK) |
- (cpu_context(cpu, next) & ASID_MASK));
- ehb(); /* Make sure it propagates to TCStatus */
- evpe(mtflags);
-#else
- write_c0_entryhi(cpu_context(cpu, next));
-#endif /* CONFIG_MIPS_MT_SMTC */
- TLBMISS_HANDLER_SETUP_PGD(next->pgd);
-
- /* mark mmu ownership change */
- cpu_clear(cpu, prev->cpu_vm_mask);
- cpu_set(cpu, next->cpu_vm_mask);
-
- local_irq_restore(flags);
-}
-
-/*
- * If mm is currently active_mm, we can't really drop it. Instead,
- * we will get a new one for it.
- */
-static inline void
-drop_mmu_context(struct mm_struct *mm, unsigned cpu)
-{
- unsigned long flags;
-#ifdef CONFIG_MIPS_MT_SMTC
- unsigned long oldasid;
- /* Can't use spinlock because called from TLB flush within DVPE */
- unsigned int prevvpe;
- int mytlb = (smtc_status & SMTC_TLB_SHARED) ? 0 : cpu_data[cpu].vpe_id;
-#endif /* CONFIG_MIPS_MT_SMTC */
-
- local_irq_save(flags);
-
- if (cpu_isset(cpu, mm->cpu_vm_mask)) {
- get_new_mmu_context(mm, cpu);
-#ifdef CONFIG_MIPS_MT_SMTC
- /* See comments for similar code above */
- prevvpe = dvpe();
- oldasid = (read_c0_entryhi() & ASID_MASK);
- if (smtc_live_asid[mytlb][oldasid]) {
- smtc_live_asid[mytlb][oldasid] &= ~(0x1 << cpu);
- if(smtc_live_asid[mytlb][oldasid] == 0)
- smtc_flush_tlb_asid(oldasid);
- }
- /* See comments for similar code above */
- write_c0_entryhi((read_c0_entryhi() & ~HW_ASID_MASK)
- | cpu_asid(cpu, mm));
- ehb(); /* Make sure it propagates to TCStatus */
- evpe(prevvpe);
-#else /* not CONFIG_MIPS_MT_SMTC */
- write_c0_entryhi(cpu_asid(cpu, mm));
-#endif /* CONFIG_MIPS_MT_SMTC */
- } else {
- /* will get a new context next time */
-#ifndef CONFIG_MIPS_MT_SMTC
- cpu_context(cpu, mm) = 0;
-#else /* SMTC */
- int i;
-
- /* SMTC shares the TLB (and ASIDs) across VPEs */
- for_each_online_cpu(i) {
- if((smtc_status & SMTC_TLB_SHARED)
- || (cpu_data[i].vpe_id == cpu_data[cpu].vpe_id))
- cpu_context(i, mm) = 0;
- }
-#endif /* CONFIG_MIPS_MT_SMTC */
- }
- local_irq_restore(flags);
-}
-
-#endif /* _ASM_MMU_CONTEXT_H */