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