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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/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
18static inline void __native_flush_tlb(void)
19{
20 write_cr3(read_cr3());
21}
22
23static 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 = read_cr4();
36 /* clear PGE */
37 write_cr4(cr4 & ~X86_CR4_PGE);
38 /* write old PGE again and flush TLBs */
39 write_cr4(cr4);
40
41 raw_local_irq_restore(flags);
42}
43
44static inline void __native_flush_tlb_single(unsigned long addr)
45{
46 asm volatile("invlpg (%0)" ::"r" (addr) : "memory");
47}
48
49static inline void __flush_tlb_all(void)
50{
51 if (cpu_has_pge)
52 __flush_tlb_global();
53 else
54 __flush_tlb();
55}
56
57static 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
96static inline void flush_tlb_mm(struct mm_struct *mm)
97{
98 if (mm == current->active_mm)
99 __flush_tlb();
100}
101
102static 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
109static 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
116static inline void native_flush_tlb_others(const cpumask_t *cpumask,
117 struct mm_struct *mm,
118 unsigned long va)
119{
120}
121
122#else /* SMP */
123
124#include <asm/smp.h>
125
126#define local_flush_tlb() __flush_tlb()
127
128extern void flush_tlb_all(void);
129extern void flush_tlb_current_task(void);
130extern void flush_tlb_mm(struct mm_struct *);
131extern void flush_tlb_page(struct vm_area_struct *, unsigned long);
132
133#define flush_tlb() flush_tlb_current_task()
134
135static inline void flush_tlb_range(struct vm_area_struct *vma,
136 unsigned long start, unsigned long end)
137{
138 flush_tlb_mm(vma->vm_mm);
139}
140
141void native_flush_tlb_others(const cpumask_t *cpumask, struct mm_struct *mm,
142 unsigned long va);
143
144#define TLBSTATE_OK 1
145#define TLBSTATE_LAZY 2
146
147#ifdef CONFIG_X86_32
148struct tlb_state {
149 struct mm_struct *active_mm;
150 int state;
151 char __cacheline_padding[L1_CACHE_BYTES-8];
152};
153DECLARE_PER_CPU(struct tlb_state, cpu_tlbstate);
154#endif
155
156#endif /* SMP */
157
158#ifndef CONFIG_PARAVIRT
159#define flush_tlb_others(mask, mm, va) native_flush_tlb_others(&mask, mm, va)
160#endif
161
162static inline void flush_tlb_kernel_range(unsigned long start,
163 unsigned long end)
164{
165 flush_tlb_all();
166}
167
168#endif /* _ASM_X86_TLBFLUSH_H */