include/asm-powerpc/tlbflush.h

   1 #ifndef _ASM_POWERPC_TLBFLUSH_H
   2 #define _ASM_POWERPC_TLBFLUSH_H
   3 /*
   4  * TLB flushing:
   5  *
   6  *  - flush_tlb_mm(mm) flushes the specified mm context TLB's
   7  *  - flush_tlb_page(vma, vmaddr) flushes one page
   8  *  - flush_tlb_page_nohash(vma, vmaddr) flushes one page if SW loaded TLB
   9  *  - flush_tlb_range(vma, start, end) flushes a range of pages
  10  *  - flush_tlb_kernel_range(start, end) flushes a range of kernel pages
  11  *  - flush_tlb_pgtables(mm, start, end) flushes a range of page tables
  12  *
  13  *  This program is free software; you can redistribute it and/or
  14  *  modify it under the terms of the GNU General Public License
  15  *  as published by the Free Software Foundation; either version
  16  *  2 of the License, or (at your option) any later version.
  17  */
  18 #ifdef __KERNEL__
  19
  20
  21 struct mm_struct;
  22
  23 #ifdef CONFIG_PPC64
  24
  25 #include <linux/percpu.h>
  26 #include <asm/page.h>
  27
  28 #define PPC64_TLB_BATCH_NR 192
  29
  30 struct ppc64_tlb_batch {
  31         unsigned long index;
  32         struct mm_struct *mm;
  33         real_pte_t pte[PPC64_TLB_BATCH_NR];
  34         unsigned long vaddr[PPC64_TLB_BATCH_NR];
  35         unsigned int psize;
  36 };
  37 DECLARE_PER_CPU(struct ppc64_tlb_batch, ppc64_tlb_batch);
  38
  39 extern void __flush_tlb_pending(struct ppc64_tlb_batch *batch);
  40
  41 static inline void flush_tlb_pending(void)
  42 {
  43         struct ppc64_tlb_batch *batch = &get_cpu_var(ppc64_tlb_batch);
  44
  45         if (batch->index)
  46                 __flush_tlb_pending(batch);
  47         put_cpu_var(ppc64_tlb_batch);
  48 }
  49
  50 extern void flush_hash_page(unsigned long va, real_pte_t pte, int psize,
  51                             int local);
  52 extern void flush_hash_range(unsigned long number, int local);
  53
  54 #else /* CONFIG_PPC64 */
  55
  56 #include <linux/mm.h>
  57
  58 extern void _tlbie(unsigned long address);
  59 extern void _tlbia(void);
  60
  61 /*
  62  * TODO: (CONFIG_FSL_BOOKE) determine if flush_tlb_range &
  63  * flush_tlb_kernel_range are best implemented as tlbia vs
  64  * specific tlbie's
  65  */
  66
  67 #if (defined(CONFIG_4xx) && !defined(CONFIG_44x)) || defined(CONFIG_8xx)
  68 #define flush_tlb_pending()     asm volatile ("tlbia; sync" : : : "memory")
  69 #elif defined(CONFIG_4xx) || defined(CONFIG_FSL_BOOKE)
  70 #define flush_tlb_pending()     _tlbia()
  71 #endif
  72
  73 /*
  74  * This gets called at the end of handling a page fault, when
  75  * the kernel has put a new PTE into the page table for the process.
  76  * We use it to ensure coherency between the i-cache and d-cache
  77  * for the page which has just been mapped in.
  78  * On machines which use an MMU hash table, we use this to put a
  79  * corresponding HPTE into the hash table ahead of time, instead of
  80  * waiting for the inevitable extra hash-table miss exception.
  81  */
  82 extern void update_mmu_cache(struct vm_area_struct *, unsigned long, pte_t);
  83
  84 #endif /* CONFIG_PPC64 */
  85
  86 #if defined(CONFIG_PPC64) || defined(CONFIG_4xx) || \
  87         defined(CONFIG_FSL_BOOKE) || defined(CONFIG_8xx)
  88
  89 static inline void flush_tlb_mm(struct mm_struct *mm)
  90 {
  91         flush_tlb_pending();
  92 }
  93
  94 static inline void flush_tlb_page(struct vm_area_struct *vma,
  95                                 unsigned long vmaddr)
  96 {
  97 #ifdef CONFIG_PPC64
  98         flush_tlb_pending();
  99 #else
 100         _tlbie(vmaddr);
 101 #endif
 102 }
 103
 104 static inline void flush_tlb_page_nohash(struct vm_area_struct *vma,
 105                                          unsigned long vmaddr)
 106 {
 107 #ifndef CONFIG_PPC64
 108         _tlbie(vmaddr);
 109 #endif
 110 }
 111
 112 static inline void flush_tlb_range(struct vm_area_struct *vma,
 113                 unsigned long start, unsigned long end)
 114 {
 115         flush_tlb_pending();
 116 }
 117
 118 static inline void flush_tlb_kernel_range(unsigned long start,
 119                 unsigned long end)
 120 {
 121         flush_tlb_pending();
 122 }
 123
 124 #else   /* 6xx, 7xx, 7xxx cpus */
 125
 126 extern void flush_tlb_mm(struct mm_struct *mm);
 127 extern void flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr);
 128 extern void flush_tlb_page_nohash(struct vm_area_struct *vma, unsigned long addr);
 129 extern void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
 130                             unsigned long end);
 131 extern void flush_tlb_kernel_range(unsigned long start, unsigned long end);
 132
 133 #endif
 134
 135 /*
 136  * This is called in munmap when we have freed up some page-table
 137  * pages.  We don't need to do anything here, there's nothing special
 138  * about our page-table pages.  -- paulus
 139  */
 140 static inline void flush_tlb_pgtables(struct mm_struct *mm,
 141                 unsigned long start, unsigned long end)
 142 {
 143 }
 144
 145 #endif /*__KERNEL__ */
 146 #endif /* _ASM_POWERPC_TLBFLUSH_H */