1 #ifndef _ASM_X86_TLBFLUSH_H 2 #define _ASM_X86_TLBFLUSH_H 3 4 #include <linux/mm.h> 5 #include <linux/sched.h> 6 7 #include <asm/processor.h> 8 #include <asm/special_insns.h> 9 10 #ifdef CONFIG_PARAVIRT 11 #include <asm/paravirt.h> 12 #else 13 #define __flush_tlb() __native_flush_tlb() 14 #define __flush_tlb_global() __native_flush_tlb_global() 15 #define __flush_tlb_single(addr) __native_flush_tlb_single(addr) 16 #endif 17 18 static inline void __native_flush_tlb(void) 19 { 20 native_write_cr3(native_read_cr3()); 21 } 22 23 static inline void __native_flush_tlb_global(void) 24 { 25 unsigned long flags; 26 unsigned long cr4; 27 28 /* 29 * Read-modify-write to CR4 - protect it from preemption and 30 * from interrupts. (Use the raw variant because this code can 31 * be called from deep inside debugging code.) 32 */ 33 raw_local_irq_save(flags); 34 35 cr4 = native_read_cr4(); 36 /* clear PGE */ 37 native_write_cr4(cr4 & ~X86_CR4_PGE); 38 /* write old PGE again and flush TLBs */ 39 native_write_cr4(cr4); 40 41 raw_local_irq_restore(flags); 42 } 43 44 static inline void __native_flush_tlb_single(unsigned long addr) 45 { 46 asm volatile("invlpg (%0)" ::"r" (addr) : "memory"); 47 } 48 49 static inline void __flush_tlb_all(void) 50 { 51 if (cpu_has_pge) 52 __flush_tlb_global(); 53 else 54 __flush_tlb(); 55 } 56 57 static inline void __flush_tlb_one(unsigned long addr) 58 { 59 __flush_tlb_single(addr); 60 } 61 62 #define TLB_FLUSH_ALL -1UL 63 64 /* 65 * TLB flushing: 66 * 67 * - flush_tlb() flushes the current mm struct TLBs 68 * - flush_tlb_all() flushes all processes TLBs 69 * - flush_tlb_mm(mm) flushes the specified mm context TLB's 70 * - flush_tlb_page(vma, vmaddr) flushes one page 71 * - flush_tlb_range(vma, start, end) flushes a range of pages 72 * - flush_tlb_kernel_range(start, end) flushes a range of kernel pages 73 * - flush_tlb_others(cpumask, mm, start, end) flushes TLBs on other cpus 74 * 75 * ..but the i386 has somewhat limited tlb flushing capabilities, 76 * and page-granular flushes are available only on i486 and up. 77 */ 78 79 #ifndef CONFIG_SMP 80 81 #define flush_tlb() __flush_tlb() 82 #define flush_tlb_all() __flush_tlb_all() 83 #define local_flush_tlb() __flush_tlb() 84 85 static inline void flush_tlb_mm(struct mm_struct *mm) 86 { 87 if (mm == current->active_mm) 88 __flush_tlb(); 89 } 90 91 static inline void flush_tlb_page(struct vm_area_struct *vma, 92 unsigned long addr) 93 { 94 if (vma->vm_mm == current->active_mm) 95 __flush_tlb_one(addr); 96 } 97 98 static inline void flush_tlb_range(struct vm_area_struct *vma, 99 unsigned long start, unsigned long end) 100 { 101 if (vma->vm_mm == current->active_mm) 102 __flush_tlb(); 103 } 104 105 static inline void flush_tlb_mm_range(struct mm_struct *mm, 106 unsigned long start, unsigned long end, unsigned long vmflag) 107 { 108 if (mm == current->active_mm) 109 __flush_tlb(); 110 } 111 112 static inline void native_flush_tlb_others(const struct cpumask *cpumask, 113 struct mm_struct *mm, 114 unsigned long start, 115 unsigned long end) 116 { 117 } 118 119 static inline void reset_lazy_tlbstate(void) 120 { 121 } 122 123 static inline void flush_tlb_kernel_range(unsigned long start, 124 unsigned long end) 125 { 126 flush_tlb_all(); 127 } 128 129 #else /* SMP */ 130 131 #include <asm/smp.h> 132 133 #define local_flush_tlb() __flush_tlb() 134 135 #define flush_tlb_mm(mm) flush_tlb_mm_range(mm, 0UL, TLB_FLUSH_ALL, 0UL) 136 137 #define flush_tlb_range(vma, start, end) \ 138 flush_tlb_mm_range(vma->vm_mm, start, end, vma->vm_flags) 139 140 extern void flush_tlb_all(void); 141 extern void flush_tlb_current_task(void); 142 extern void flush_tlb_page(struct vm_area_struct *, unsigned long); 143 extern void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start, 144 unsigned long end, unsigned long vmflag); 145 extern void flush_tlb_kernel_range(unsigned long start, unsigned long end); 146 147 #define flush_tlb() flush_tlb_current_task() 148 149 void native_flush_tlb_others(const struct cpumask *cpumask, 150 struct mm_struct *mm, 151 unsigned long start, unsigned long end); 152 153 #define TLBSTATE_OK 1 154 #define TLBSTATE_LAZY 2 155 156 struct tlb_state { 157 struct mm_struct *active_mm; 158 int state; 159 }; 160 DECLARE_PER_CPU_SHARED_ALIGNED(struct tlb_state, cpu_tlbstate); 161 162 static inline void reset_lazy_tlbstate(void) 163 { 164 this_cpu_write(cpu_tlbstate.state, 0); 165 this_cpu_write(cpu_tlbstate.active_mm, &init_mm); 166 } 167 168 #endif /* SMP */ 169 170 #ifndef CONFIG_PARAVIRT 171 #define flush_tlb_others(mask, mm, start, end) \ 172 native_flush_tlb_others(mask, mm, start, end) 173 #endif 174 175 #endif /* _ASM_X86_TLBFLUSH_H */ 176