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Diffstat (limited to 'include/asm-ia64/mmu_context.h')
-rw-r--r--include/asm-ia64/mmu_context.h198
1 files changed, 0 insertions, 198 deletions
diff --git a/include/asm-ia64/mmu_context.h b/include/asm-ia64/mmu_context.h
deleted file mode 100644
index 040bc87db93..00000000000
--- a/include/asm-ia64/mmu_context.h
+++ /dev/null
@@ -1,198 +0,0 @@
-#ifndef _ASM_IA64_MMU_CONTEXT_H
-#define _ASM_IA64_MMU_CONTEXT_H
-
-/*
- * Copyright (C) 1998-2002 Hewlett-Packard Co
- * David Mosberger-Tang <davidm@hpl.hp.com>
- */
-
-/*
- * Routines to manage the allocation of task context numbers. Task context
- * numbers are used to reduce or eliminate the need to perform TLB flushes
- * due to context switches. Context numbers are implemented using ia-64
- * region ids. Since the IA-64 TLB does not consider the region number when
- * performing a TLB lookup, we need to assign a unique region id to each
- * region in a process. We use the least significant three bits in aregion
- * id for this purpose.
- */
-
-#define IA64_REGION_ID_KERNEL 0 /* the kernel's region id (tlb.c depends on this being 0) */
-
-#define ia64_rid(ctx,addr) (((ctx) << 3) | (addr >> 61))
-
-# include <asm/page.h>
-# ifndef __ASSEMBLY__
-
-#include <linux/compiler.h>
-#include <linux/percpu.h>
-#include <linux/sched.h>
-#include <linux/spinlock.h>
-
-#include <asm/processor.h>
-#include <asm-generic/mm_hooks.h>
-
-struct ia64_ctx {
- spinlock_t lock;
- unsigned int next; /* next context number to use */
- unsigned int limit; /* available free range */
- unsigned int max_ctx; /* max. context value supported by all CPUs */
- /* call wrap_mmu_context when next >= max */
- unsigned long *bitmap; /* bitmap size is max_ctx+1 */
- unsigned long *flushmap;/* pending rid to be flushed */
-};
-
-extern struct ia64_ctx ia64_ctx;
-DECLARE_PER_CPU(u8, ia64_need_tlb_flush);
-
-extern void mmu_context_init (void);
-extern void wrap_mmu_context (struct mm_struct *mm);
-
-static inline void
-enter_lazy_tlb (struct mm_struct *mm, struct task_struct *tsk)
-{
-}
-
-/*
- * When the context counter wraps around all TLBs need to be flushed because
- * an old context number might have been reused. This is signalled by the
- * ia64_need_tlb_flush per-CPU variable, which is checked in the routine
- * below. Called by activate_mm(). <efocht@ess.nec.de>
- */
-static inline void
-delayed_tlb_flush (void)
-{
- extern void local_flush_tlb_all (void);
- unsigned long flags;
-
- if (unlikely(__ia64_per_cpu_var(ia64_need_tlb_flush))) {
- spin_lock_irqsave(&ia64_ctx.lock, flags);
- if (__ia64_per_cpu_var(ia64_need_tlb_flush)) {
- local_flush_tlb_all();
- __ia64_per_cpu_var(ia64_need_tlb_flush) = 0;
- }
- spin_unlock_irqrestore(&ia64_ctx.lock, flags);
- }
-}
-
-static inline nv_mm_context_t
-get_mmu_context (struct mm_struct *mm)
-{
- unsigned long flags;
- nv_mm_context_t context = mm->context;
-
- if (likely(context))
- goto out;
-
- spin_lock_irqsave(&ia64_ctx.lock, flags);
- /* re-check, now that we've got the lock: */
- context = mm->context;
- if (context == 0) {
- cpus_clear(mm->cpu_vm_mask);
- if (ia64_ctx.next >= ia64_ctx.limit) {
- ia64_ctx.next = find_next_zero_bit(ia64_ctx.bitmap,
- ia64_ctx.max_ctx, ia64_ctx.next);
- ia64_ctx.limit = find_next_bit(ia64_ctx.bitmap,
- ia64_ctx.max_ctx, ia64_ctx.next);
- if (ia64_ctx.next >= ia64_ctx.max_ctx)
- wrap_mmu_context(mm);
- }
- mm->context = context = ia64_ctx.next++;
- __set_bit(context, ia64_ctx.bitmap);
- }
- spin_unlock_irqrestore(&ia64_ctx.lock, flags);
-out:
- /*
- * Ensure we're not starting to use "context" before any old
- * uses of it are gone from our TLB.
- */
- delayed_tlb_flush();
-
- return context;
-}
-
-/*
- * Initialize context number to some sane value. MM is guaranteed to be a
- * brand-new address-space, so no TLB flushing is needed, ever.
- */
-static inline int
-init_new_context (struct task_struct *p, struct mm_struct *mm)
-{
- mm->context = 0;
- return 0;
-}
-
-static inline void
-destroy_context (struct mm_struct *mm)
-{
- /* Nothing to do. */
-}
-
-static inline void
-reload_context (nv_mm_context_t context)
-{
- unsigned long rid;
- unsigned long rid_incr = 0;
- unsigned long rr0, rr1, rr2, rr3, rr4, old_rr4;
-
- old_rr4 = ia64_get_rr(RGN_BASE(RGN_HPAGE));
- rid = context << 3; /* make space for encoding the region number */
- rid_incr = 1 << 8;
-
- /* encode the region id, preferred page size, and VHPT enable bit: */
- rr0 = (rid << 8) | (PAGE_SHIFT << 2) | 1;
- rr1 = rr0 + 1*rid_incr;
- rr2 = rr0 + 2*rid_incr;
- rr3 = rr0 + 3*rid_incr;
- rr4 = rr0 + 4*rid_incr;
-#ifdef CONFIG_HUGETLB_PAGE
- rr4 = (rr4 & (~(0xfcUL))) | (old_rr4 & 0xfc);
-
-# if RGN_HPAGE != 4
-# error "reload_context assumes RGN_HPAGE is 4"
-# endif
-#endif
-
- ia64_set_rr0_to_rr4(rr0, rr1, rr2, rr3, rr4);
- ia64_srlz_i(); /* srlz.i implies srlz.d */
-}
-
-/*
- * Must be called with preemption off
- */
-static inline void
-activate_context (struct mm_struct *mm)
-{
- nv_mm_context_t context;
-
- do {
- context = get_mmu_context(mm);
- if (!cpu_isset(smp_processor_id(), mm->cpu_vm_mask))
- cpu_set(smp_processor_id(), mm->cpu_vm_mask);
- reload_context(context);
- /*
- * in the unlikely event of a TLB-flush by another thread,
- * redo the load.
- */
- } while (unlikely(context != mm->context));
-}
-
-#define deactivate_mm(tsk,mm) do { } while (0)
-
-/*
- * Switch from address space PREV to address space NEXT.
- */
-static inline void
-activate_mm (struct mm_struct *prev, struct mm_struct *next)
-{
- /*
- * We may get interrupts here, but that's OK because interrupt
- * handlers cannot touch user-space.
- */
- ia64_set_kr(IA64_KR_PT_BASE, __pa(next->pgd));
- activate_context(next);
-}
-
-#define switch_mm(prev_mm,next_mm,next_task) activate_mm(prev_mm, next_mm)
-
-# endif /* ! __ASSEMBLY__ */
-#endif /* _ASM_IA64_MMU_CONTEXT_H */