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linux
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
18static inline void __native_flush_tlb(void)
19{
20 native_write_cr3(native_read_cr3());
21}
22
23static inline void __native_flush_tlb_global_irq_disabled(void)
24{
25 unsigned long cr4;
26
27 cr4 = native_read_cr4();
28 /* clear PGE */
29 native_write_cr4(cr4 & ~X86_CR4_PGE);
30 /* write old PGE again and flush TLBs */
31 native_write_cr4(cr4);
32}
33
34static inline void __native_flush_tlb_global(void)
35{
36 unsigned long flags;
37
38 /*
39 * Read-modify-write to CR4 - protect it from preemption and
40 * from interrupts. (Use the raw variant because this code can
41 * be called from deep inside debugging code.)
42 */
43 raw_local_irq_save(flags);
44
45 __native_flush_tlb_global_irq_disabled();
46
47 raw_local_irq_restore(flags);
48}
49
50static inline void __native_flush_tlb_single(unsigned long addr)
51{
52 asm volatile("invlpg (%0)" ::"r" (addr) : "memory");
53}
54
55static inline void __flush_tlb_all(void)
56{
57 if (cpu_has_pge)
58 __flush_tlb_global();
59 else
60 __flush_tlb();
61}
62
63static inline void __flush_tlb_one(unsigned long addr)
64{
65 count_vm_event(NR_TLB_LOCAL_FLUSH_ONE);
66 __flush_tlb_single(addr);
67}
68
69#define TLB_FLUSH_ALL -1UL
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, start, end) 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
86#ifndef CONFIG_SMP
87
88/* "_up" is for UniProcessor.
89 *
90 * This is a helper for other header functions. *Not* intended to be called
91 * directly. All global TLB flushes need to either call this, or to bump the
92 * vm statistics themselves.
93 */
94static inline void __flush_tlb_up(void)
95{
96 count_vm_event(NR_TLB_LOCAL_FLUSH_ALL);
97 __flush_tlb();
98}
99
100static inline void flush_tlb_all(void)
101{
102 count_vm_event(NR_TLB_LOCAL_FLUSH_ALL);
103 __flush_tlb_all();
104}
105
106static inline void flush_tlb(void)
107{
108 __flush_tlb_up();
109}
110
111static inline void local_flush_tlb(void)
112{
113 __flush_tlb_up();
114}
115
116static inline void flush_tlb_mm(struct mm_struct *mm)
117{
118 if (mm == current->active_mm)
119 __flush_tlb_up();
120}
121
122static inline void flush_tlb_page(struct vm_area_struct *vma,
123 unsigned long addr)
124{
125 if (vma->vm_mm == current->active_mm)
126 __flush_tlb_one(addr);
127}
128
129static inline void flush_tlb_range(struct vm_area_struct *vma,
130 unsigned long start, unsigned long end)
131{
132 if (vma->vm_mm == current->active_mm)
133 __flush_tlb_up();
134}
135
136static inline void flush_tlb_mm_range(struct mm_struct *mm,
137 unsigned long start, unsigned long end, unsigned long vmflag)
138{
139 if (mm == current->active_mm)
140 __flush_tlb_up();
141}
142
143static inline void native_flush_tlb_others(const struct cpumask *cpumask,
144 struct mm_struct *mm,
145 unsigned long start,
146 unsigned long end)
147{
148}
149
150static inline void reset_lazy_tlbstate(void)
151{
152}
153
154static inline void flush_tlb_kernel_range(unsigned long start,
155 unsigned long end)
156{
157 flush_tlb_all();
158}
159
160#else /* SMP */
161
162#include <asm/smp.h>
163
164#define local_flush_tlb() __flush_tlb()
165
166#define flush_tlb_mm(mm) flush_tlb_mm_range(mm, 0UL, TLB_FLUSH_ALL, 0UL)
167
168#define flush_tlb_range(vma, start, end) \
169 flush_tlb_mm_range(vma->vm_mm, start, end, vma->vm_flags)
170
171extern void flush_tlb_all(void);
172extern void flush_tlb_current_task(void);
173extern void flush_tlb_page(struct vm_area_struct *, unsigned long);
174extern void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start,
175 unsigned long end, unsigned long vmflag);
176extern void flush_tlb_kernel_range(unsigned long start, unsigned long end);
177
178#define flush_tlb() flush_tlb_current_task()
179
180void native_flush_tlb_others(const struct cpumask *cpumask,
181 struct mm_struct *mm,
182 unsigned long start, unsigned long end);
183
184#define TLBSTATE_OK 1
185#define TLBSTATE_LAZY 2
186
187struct tlb_state {
188 struct mm_struct *active_mm;
189 int state;
190};
191DECLARE_PER_CPU_SHARED_ALIGNED(struct tlb_state, cpu_tlbstate);
192
193static inline void reset_lazy_tlbstate(void)
194{
195 this_cpu_write(cpu_tlbstate.state, 0);
196 this_cpu_write(cpu_tlbstate.active_mm, &init_mm);
197}
198
199#endif /* SMP */
200
201#ifndef CONFIG_PARAVIRT
202#define flush_tlb_others(mask, mm, start, end) \
203 native_flush_tlb_others(mask, mm, start, end)
204#endif
205
206#endif /* _ASM_X86_TLBFLUSH_H */