1 #ifndef _PARISC_TLBFLUSH_H
2 #define _PARISC_TLBFLUSH_H
4 /* TLB flushing routines.... */
7 #include <linux/sched.h>
8 #include <asm/mmu_context.h>
11 /* This is for the serialisation of PxTLB broadcasts. At least on the
12 * N class systems, only one PxTLB inter processor broadcast can be
13 * active at any one time on the Merced bus. This tlb purge
14 * synchronisation is fairly lightweight and harmless so we activate
15 * it on all systems not just the N class.
17 * It is also used to ensure PTE updates are atomic and consistent
20 extern spinlock_t pa_tlb_lock;
22 #define purge_tlb_start(flags) spin_lock_irqsave(&pa_tlb_lock, flags)
23 #define purge_tlb_end(flags) spin_unlock_irqrestore(&pa_tlb_lock, flags)
25 extern void flush_tlb_all(void);
26 extern void flush_tlb_all_local(void *);
28 #define smp_flush_tlb_all() flush_tlb_all()
30 int __flush_tlb_range(unsigned long sid,
31 unsigned long start, unsigned long end);
33 #define flush_tlb_range(vma, start, end) \
34 __flush_tlb_range((vma)->vm_mm->context, start, end)
36 #define flush_tlb_kernel_range(start, end) \
37 __flush_tlb_range(0, start, end)
42 * The code to switch to a new context is NOT valid for processes
43 * which play with the space id's. Thus, we have to preserve the
44 * space and just flush the entire tlb. However, the compilers,
45 * dynamic linker, etc, do not manipulate space id's, so there
46 * could be a significant performance benefit in switching contexts
47 * and not flushing the whole tlb.
50 static inline void flush_tlb_mm(struct mm_struct *mm)
52 BUG_ON(mm == &init_mm); /* Should never happen */
54 #if 1 || defined(CONFIG_SMP)
55 /* Except for very small threads, flushing the whole TLB is
56 * faster than using __flush_tlb_range. The pdtlb and pitlb
57 * instructions are very slow because of the TLB broadcast.
58 * It might be faster to do local range flushes on all CPUs
63 /* FIXME: currently broken, causing space id and protection ids
64 * to go out of sync, resulting in faults on userspace accesses.
65 * This approach needs further investigation since running many
66 * small applications (e.g., GCC testsuite) is faster on HP-UX.
70 free_sid(mm->context);
71 mm->context = alloc_sid();
72 if (mm == current->active_mm)
73 load_context(mm->context);
78 static inline void flush_tlb_page(struct vm_area_struct *vma,
81 unsigned long flags, sid;
83 sid = vma->vm_mm->context;
84 purge_tlb_start(flags);
87 if (unlikely(split_tlb))