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 if (cpu_has_invlpg) 60 __flush_tlb_single(addr); 61 else 62 __flush_tlb(); 63 } 64 65 #ifdef CONFIG_X86_32 66 # define TLB_FLUSH_ALL 0xffffffff 67 #else 68 # define TLB_FLUSH_ALL -1ULL 69 #endif 70 71 /* 72 * TLB flushing: 73 * 74 * - flush_tlb() flushes the current mm struct TLBs 75 * - flush_tlb_all() flushes all processes TLBs 76 * - flush_tlb_mm(mm) flushes the specified mm context TLB's 77 * - flush_tlb_page(vma, vmaddr) flushes one page 78 * - flush_tlb_range(vma, start, end) flushes a range of pages 79 * - flush_tlb_kernel_range(start, end) flushes a range of kernel pages 80 * - flush_tlb_others(cpumask, mm, va) flushes TLBs on other cpus 81 * 82 * ..but the i386 has somewhat limited tlb flushing capabilities, 83 * and page-granular flushes are available only on i486 and up. 84 * 85 * x86-64 can only flush individual pages or full VMs. For a range flush 86 * we always do the full VM. Might be worth trying if for a small 87 * range a few INVLPGs in a row are a win. 88 */ 89 90 #ifndef CONFIG_SMP 91 92 #define flush_tlb() __flush_tlb() 93 #define flush_tlb_all() __flush_tlb_all() 94 #define local_flush_tlb() __flush_tlb() 95 96 static inline void flush_tlb_mm(struct mm_struct *mm) 97 { 98 if (mm == current->active_mm) 99 __flush_tlb(); 100 } 101 102 static inline void flush_tlb_page(struct vm_area_struct *vma, 103 unsigned long addr) 104 { 105 if (vma->vm_mm == current->active_mm) 106 __flush_tlb_one(addr); 107 } 108 109 static inline void flush_tlb_range(struct vm_area_struct *vma, 110 unsigned long start, unsigned long end) 111 { 112 if (vma->vm_mm == current->active_mm) 113 __flush_tlb(); 114 } 115 116 static inline void native_flush_tlb_others(const struct cpumask *cpumask, 117 struct mm_struct *mm, 118 unsigned long va) 119 { 120 } 121 122 static inline void reset_lazy_tlbstate(void) 123 { 124 } 125 126 #else /* SMP */ 127 128 #include <asm/smp.h> 129 130 #define local_flush_tlb() __flush_tlb() 131 132 extern void flush_tlb_all(void); 133 extern void flush_tlb_current_task(void); 134 extern void flush_tlb_mm(struct mm_struct *); 135 extern void flush_tlb_page(struct vm_area_struct *, unsigned long); 136 137 #define flush_tlb() flush_tlb_current_task() 138 139 static inline void flush_tlb_range(struct vm_area_struct *vma, 140 unsigned long start, unsigned long end) 141 { 142 flush_tlb_mm(vma->vm_mm); 143 } 144 145 void native_flush_tlb_others(const struct cpumask *cpumask, 146 struct mm_struct *mm, unsigned long va); 147 148 #define TLBSTATE_OK 1 149 #define TLBSTATE_LAZY 2 150 151 struct tlb_state { 152 struct mm_struct *active_mm; 153 int state; 154 }; 155 DECLARE_PER_CPU_SHARED_ALIGNED(struct tlb_state, cpu_tlbstate); 156 157 static inline void reset_lazy_tlbstate(void) 158 { 159 percpu_write(cpu_tlbstate.state, 0); 160 percpu_write(cpu_tlbstate.active_mm, &init_mm); 161 } 162 163 #endif /* SMP */ 164 165 #ifndef CONFIG_PARAVIRT 166 #define flush_tlb_others(mask, mm, va) native_flush_tlb_others(mask, mm, va) 167 #endif 168 169 static inline void flush_tlb_kernel_range(unsigned long start, 170 unsigned long end) 171 { 172 flush_tlb_all(); 173 } 174 175 #endif /* _ASM_X86_TLBFLUSH_H */ 176