From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- arch/parisc/include/asm/tlbflush.h | 86 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 86 insertions(+) create mode 100644 arch/parisc/include/asm/tlbflush.h (limited to 'arch/parisc/include/asm/tlbflush.h') diff --git a/arch/parisc/include/asm/tlbflush.h b/arch/parisc/include/asm/tlbflush.h new file mode 100644 index 000000000..9d086a599 --- /dev/null +++ b/arch/parisc/include/asm/tlbflush.h @@ -0,0 +1,86 @@ +#ifndef _PARISC_TLBFLUSH_H +#define _PARISC_TLBFLUSH_H + +/* TLB flushing routines.... */ + +#include +#include +#include + + +/* 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 systems not just the N class. + */ +extern spinlock_t pa_tlb_lock; + +#define purge_tlb_start(flags) spin_lock_irqsave(&pa_tlb_lock, flags) +#define purge_tlb_end(flags) spin_unlock_irqrestore(&pa_tlb_lock, flags) + +extern void flush_tlb_all(void); +extern void flush_tlb_all_local(void *); + +#define smp_flush_tlb_all() flush_tlb_all() + +/* + * 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 */ + +#if 1 || defined(CONFIG_SMP) + flush_tlb_all(); +#else + /* FIXME: currently broken, causing space id and protection ids + * to go out of sync, resulting in faults on userspace accesses. + */ + if (mm) { + if (mm->context != 0) + free_sid(mm->context); + mm->context = alloc_sid(); + if (mm == current->active_mm) + load_context(mm->context); + } +#endif +} + +static inline void flush_tlb_page(struct vm_area_struct *vma, + unsigned long addr) +{ + unsigned long flags, sid; + + /* For one page, it's not worth testing the split_tlb variable */ + + mb(); + sid = vma->vm_mm->context; + purge_tlb_start(flags); + mtsp(sid, 1); + pdtlb(addr); + pitlb(addr); + purge_tlb_end(flags); +} + +void __flush_tlb_range(unsigned long sid, + unsigned long start, unsigned long end); + +#define flush_tlb_range(vma,start,end) __flush_tlb_range((vma)->vm_mm->context,start,end) + +#define flush_tlb_kernel_range(start, end) __flush_tlb_range(0,start,end) + +#endif -- cgit v1.2.3-54-g00ecf