include/asm-i386/tlbflush.h

   1 #ifndef _I386_TLBFLUSH_H
   2 #define _I386_TLBFLUSH_H
   3
   4 #include <linux/config.h>
   5 #include <linux/mm.h>
   6 #include <asm/processor.h>
   7
   8 #define __flush_tlb()                                                   \
   9         do {                                                            \
  10                 unsigned int tmpreg;                                    \
  11                                                                         \
  12                 __asm__ __volatile__(                                   \
  13                         "movl %%cr3, %0;              \n"               \
  14                         "movl %0, %%cr3;  # flush TLB \n"               \
  15                         : "=r" (tmpreg)                                 \
  16                         :: "memory");                                   \
  17         } while (0)
  18
  19 /*
  20  * Global pages have to be flushed a bit differently. Not a real
  21  * performance problem because this does not happen often.
  22  */
  23 #define __flush_tlb_global()                                            \
  24         do {                                                            \
  25                 unsigned int tmpreg;                                    \
  26                                                                         \
  27                 __asm__ __volatile__(                                   \
  28                         "movl %1, %%cr4;  # turn off PGE     \n"        \
  29                         "movl %%cr3, %0;                     \n"        \
  30                         "movl %0, %%cr3;  # flush TLB        \n"        \
  31                         "movl %2, %%cr4;  # turn PGE back on \n"        \
  32                         : "=&r" (tmpreg)                                \
  33                         : "r" (mmu_cr4_features & ~X86_CR4_PGE),        \
  34                           "r" (mmu_cr4_features)                        \
  35                         : "memory");                                    \
  36         } while (0)
  37
  38 extern unsigned long pgkern_mask;
  39
  40 # define __flush_tlb_all()                                              \
  41         do {                                                            \
  42                 if (cpu_has_pge)                                        \
  43                         __flush_tlb_global();                           \
  44                 else                                                    \
  45                         __flush_tlb();                                  \
  46         } while (0)
  47
  48 #define cpu_has_invlpg  (boot_cpu_data.x86 > 3)
  49
  50 #define __flush_tlb_single(addr) \
  51         __asm__ __volatile__("invlpg %0": :"m" (*(char *) addr))
  52
  53 #ifdef CONFIG_X86_INVLPG
  54 # define __flush_tlb_one(addr) __flush_tlb_single(addr)
  55 #else
  56 # define __flush_tlb_one(addr)                                          \
  57         do {                                                            \
  58                 if (cpu_has_invlpg)                                     \
  59                         __flush_tlb_single(addr);                       \
  60                 else                                                    \
  61                         __flush_tlb();                                  \
  62         } while (0)
  63 #endif
  64
  65 /*
  66  * TLB flushing:
  67  *
  68  *  - flush_tlb() flushes the current mm struct TLBs
  69  *  - flush_tlb_all() flushes all processes TLBs
  70  *  - flush_tlb_mm(mm) flushes the specified mm context TLB's
  71  *  - flush_tlb_page(vma, vmaddr) flushes one page
  72  *  - flush_tlb_range(vma, start, end) flushes a range of pages
  73  *  - flush_tlb_kernel_range(start, end) flushes a range of kernel pages
  74  *  - flush_tlb_pgtables(mm, start, end) flushes a range of page tables
  75  *
  76  * ..but the i386 has somewhat limited tlb flushing capabilities,
  77  * and page-granular flushes are available only on i486 and up.
  78  */
  79
  80 #ifndef CONFIG_SMP
  81
  82 #define flush_tlb() __flush_tlb()
  83 #define flush_tlb_all() __flush_tlb_all()
  84 #define local_flush_tlb() __flush_tlb()
  85
  86 static inline void flush_tlb_mm(struct mm_struct *mm)
  87 {
  88 #ifndef CONFIG_X86_SWITCH_PAGETABLES
  89         if (mm == current->active_mm)
  90                 __flush_tlb();
  91 #endif
  92 }
  93
  94 static inline void flush_tlb_page(struct vm_area_struct *vma,
  95         unsigned long addr)
  96 {
  97 #ifndef CONFIG_X86_SWITCH_PAGETABLES
  98         if (vma->vm_mm == current->active_mm)
  99                 __flush_tlb_one(addr);
 100 #endif
 101 }
 102
 103 static inline void flush_tlb_range(struct vm_area_struct *vma,
 104         unsigned long start, unsigned long end)
 105 {
 106 #ifndef CONFIG_X86_SWITCH_PAGETABLES
 107         if (vma->vm_mm == current->active_mm)
 108                 __flush_tlb();
 109 #endif
 110 }
 111
 112 #else
 113
 114 #include <asm/smp.h>
 115
 116 #define local_flush_tlb() \
 117         __flush_tlb()
 118
 119 extern void flush_tlb_all(void);
 120 extern void flush_tlb_mm(struct mm_struct *);
 121 extern void flush_tlb_page(struct vm_area_struct *, unsigned long);
 122
 123 #define flush_tlb()     flush_tlb_all()
 124
 125 static inline void flush_tlb_range(struct vm_area_struct * vma, unsigned long start, unsigned long end)
 126 {
 127         flush_tlb_mm(vma->vm_mm);
 128 }
 129
 130 #define TLBSTATE_OK     1
 131 #define TLBSTATE_LAZY   2
 132
 133 struct tlb_state
 134 {
 135         struct mm_struct *active_mm;
 136         int state;
 137         char __cacheline_padding[L1_CACHE_BYTES-8];
 138 };
 139 extern struct tlb_state cpu_tlbstate[NR_CPUS];
 140
 141
 142 #endif
 143
 144 #define flush_tlb_kernel_range(start, end) flush_tlb_all()
 145
 146 static inline void flush_tlb_pgtables(struct mm_struct *mm,
 147                                       unsigned long start, unsigned long end)
 148 {
 149         /* i386 does not keep any page table caches in TLB */
 150 }
 151
 152 #endif /* _I386_TLBFLUSH_H */