include/asm-parisc/tlbflush.h

#ifndef _PARISC_TLBFLUSH_H
#define _PARISC_TLBFLUSH_H

/* TLB flushing routines.... */

#include <linux/config.h>
#include <linux/mm.h>
#include <asm/mmu_context.h>


/* This is for the serialisation of PxTLB broadcasts.  At least on the
 * N class systems, only one PxTLB inter processor broadcast can be
 * active at any one time on the Merced bus.  This tlb purge
 * synchronisation is fairly lightweight and harmless so we activate
 * it on all SMP systems not just the N class. */
#ifdef CONFIG_SMP
extern spinlock_t pa_tlb_lock;

#define purge_tlb_start(x) spin_lock(&pa_tlb_lock)
#define purge_tlb_end(x) spin_unlock(&pa_tlb_lock)

#else

#define purge_tlb_start(x) do { } while(0)
#define purge_tlb_end(x) do { } while (0)

#endif


extern void flush_tlb_all(void);

/*
 * flush_tlb_mm()
 *
 * XXX This code is NOT valid for HP-UX compatibility processes,
 * (although it will probably work 99% of the time). HP-UX
 * processes are free to play with the space id's and save them
 * over long periods of time, etc. so we have to preserve the
 * space and just flush the entire tlb. We need to check the
 * personality in order to do that, but the personality is not
 * currently being set correctly.
 *
 * Of course, Linux processes could do the same thing, but
 * we don't support that (and the compilers, dynamic linker,
 * etc. do not do that).
 */

static inline void flush_tlb_mm(struct mm_struct *mm)
{
	BUG_ON(mm == &init_mm); /* Should never happen */

#ifdef CONFIG_SMP
	flush_tlb_all();
#else
	if (mm) {
		if (mm->context != 0)
			free_sid(mm->context);
		mm->context = alloc_sid();
		if (mm == current->active_mm)
			load_context(mm->context);
	}
#endif
}

extern __inline__ void flush_tlb_pgtables(struct mm_struct *mm, unsigned long start, unsigned long end)
{
}
 
static inline void flush_tlb_page(struct vm_area_struct *vma,
	unsigned long addr)
{
	/* For one page, it's not worth testing the split_tlb variable */

	mb();
	mtsp(vma->vm_mm->context,1);
	purge_tlb_start();
	pdtlb(addr);
	pitlb(addr);
	purge_tlb_end();
}

static inline void flush_tlb_range(struct vm_area_struct *vma,
	unsigned long start, unsigned long end)
{
	unsigned long npages;

	npages = ((end - (start & PAGE_MASK)) + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
	if (npages >= 512)  /* 2MB of space: arbitrary, should be tuned */
		flush_tlb_all();
	else {
		preempt_disable();
		mtsp(vma->vm_mm->context,1);
		purge_tlb_start();
		if (split_tlb) {
			while (npages--) {
				pdtlb(start);
				pitlb(start);
				start += PAGE_SIZE;
			}
		} else {
			while (npages--) {
				pdtlb(start);
				start += PAGE_SIZE;
			}
		preempt_enable();
		}
		purge_tlb_end();
	}
}

#define flush_tlb_kernel_range(start, end) flush_tlb_all()

#endif