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#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. We also need to have
* preemption disabled on uniprocessor machines, and spin_lock does that
* nicely.
*/
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)
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 {
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;
}
}
purge_tlb_end();
}
}
#define flush_tlb_kernel_range(start, end) flush_tlb_all()
#endif
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