include/asm-i386/tlbflush.h

   1 #ifndef _I386_TLBFLUSH_H
   2 #define _I386_TLBFLUSH_H
   3
   4 #include <linux/mm.h>
   5 #include <asm/processor.h>
   6
   7 #ifdef CONFIG_PARAVIRT
   8 #include <asm/paravirt.h>
   9 #else
  10 #define __flush_tlb() __native_flush_tlb()
  11 #define __flush_tlb_global() __native_flush_tlb_global()
  12 #define __flush_tlb_single(addr) __native_flush_tlb_single(addr)
  13 #endif
  14
  15 #define __native_flush_tlb()                                            \
  16         do {                                                            \
  17                 unsigned int tmpreg;                                    \
  18                                                                         \
  19                 __asm__ __volatile__(                                   \
  20                         "movl %%cr3, %0;              \n"               \
  21                         "movl %0, %%cr3;  # flush TLB \n"               \
  22                         : "=r" (tmpreg)                                 \
  23                         :: "memory");                                   \
  24         } while (0)
  25
  26 /*
  27  * Global pages have to be flushed a bit differently. Not a real
  28  * performance problem because this does not happen often.
  29  */
  30 #define __native_flush_tlb_global()                                     \
  31         do {                                                            \
  32                 unsigned int tmpreg, cr4, cr4_orig;                     \
  33                                                                         \
  34                 __asm__ __volatile__(                                   \
  35                         "movl %%cr4, %2;  # turn off PGE     \n"        \
  36                         "movl %2, %1;                        \n"        \
  37                         "andl %3, %1;                        \n"        \
  38                         "movl %1, %%cr4;                     \n"        \
  39                         "movl %%cr3, %0;                     \n"        \
  40                         "movl %0, %%cr3;  # flush TLB        \n"        \
  41                         "movl %2, %%cr4;  # turn PGE back on \n"        \
  42                         : "=&r" (tmpreg), "=&r" (cr4), "=&r" (cr4_orig) \
  43                         : "i" (~X86_CR4_PGE)                            \
  44                         : "memory");                                    \
  45         } while (0)
  46
  47 #define __native_flush_tlb_single(addr)                                 \
  48         __asm__ __volatile__("invlpg (%0)" ::"r" (addr) : "memory")
  49
  50 # define __flush_tlb_all()                                              \
  51         do {                                                            \
  52                 if (cpu_has_pge)                                        \
  53                         __flush_tlb_global();                           \
  54                 else                                                    \
  55                         __flush_tlb();                                  \
  56         } while (0)
  57
  58 #define cpu_has_invlpg  (boot_cpu_data.x86 > 3)
  59
  60 #ifdef CONFIG_X86_INVLPG
  61 # define __flush_tlb_one(addr) __flush_tlb_single(addr)
  62 #else
  63 # define __flush_tlb_one(addr)                                          \
  64         do {                                                            \
  65                 if (cpu_has_invlpg)                                     \
  66                         __flush_tlb_single(addr);                       \
  67                 else                                                    \
  68                         __flush_tlb();                                  \
  69         } while (0)
  70 #endif
  71
  72 /*
  73  * TLB flushing:
  74  *
  75  *  - flush_tlb() flushes the current mm struct TLBs
  76  *  - flush_tlb_all() flushes all processes TLBs
  77  *  - flush_tlb_mm(mm) flushes the specified mm context TLB's
  78  *  - flush_tlb_page(vma, vmaddr) flushes one page
  79  *  - flush_tlb_range(vma, start, end) flushes a range of pages
  80  *  - flush_tlb_kernel_range(start, end) flushes a range of kernel pages
  81  *  - flush_tlb_pgtables(mm, start, end) flushes a range of page tables
  82  *
  83  * ..but the i386 has somewhat limited tlb flushing capabilities,
  84  * and page-granular flushes are available only on i486 and up.
  85  */
  86
  87 #ifndef CONFIG_SMP
  88
  89 #define flush_tlb() __flush_tlb()
  90 #define flush_tlb_all() __flush_tlb_all()
  91 #define local_flush_tlb() __flush_tlb()
  92
  93 static inline void flush_tlb_mm(struct mm_struct *mm)
  94 {
  95         if (mm == current->active_mm)
  96                 __flush_tlb();
  97 }
  98
  99 static inline void flush_tlb_page(struct vm_area_struct *vma,
 100         unsigned long addr)
 101 {
 102         if (vma->vm_mm == current->active_mm)
 103                 __flush_tlb_one(addr);
 104 }
 105
 106 static inline void flush_tlb_range(struct vm_area_struct *vma,
 107         unsigned long start, unsigned long end)
 108 {
 109         if (vma->vm_mm == current->active_mm)
 110                 __flush_tlb();
 111 }
 112
 113 #else
 114
 115 #include <asm/smp.h>
 116
 117 #define local_flush_tlb() \
 118         __flush_tlb()
 119
 120 extern void flush_tlb_all(void);
 121 extern void flush_tlb_current_task(void);
 122 extern void flush_tlb_mm(struct mm_struct *);
 123 extern void flush_tlb_page(struct vm_area_struct *, unsigned long);
 124
 125 #define flush_tlb()     flush_tlb_current_task()
 126
 127 static inline void flush_tlb_range(struct vm_area_struct * vma, unsigned long start, unsigned long end)
 128 {
 129         flush_tlb_mm(vma->vm_mm);
 130 }
 131
 132 #define TLBSTATE_OK     1
 133 #define TLBSTATE_LAZY   2
 134
 135 struct tlb_state
 136 {
 137         struct mm_struct *active_mm;
 138         int state;
 139         char __cacheline_padding[L1_CACHE_BYTES-8];
 140 };
 141 DECLARE_PER_CPU(struct tlb_state, cpu_tlbstate);
 142
 143
 144 #endif
 145
 146 #define flush_tlb_kernel_range(start, end) flush_tlb_all()
 147
 148 static inline void flush_tlb_pgtables(struct mm_struct *mm,
 149                                       unsigned long start, unsigned long end)
 150 {
 151         /* i386 does not keep any page table caches in TLB */
 152 }
 153
 154 #endif /* _I386_TLBFLUSH_H */