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/system.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 extern void zap_low_mappings(bool early);
176
177 #endif /* _ASM_X86_TLBFLUSH_H */
178
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