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linux
1#ifndef _X8664_TLBFLUSH_H
2#define _X8664_TLBFLUSH_H
3
4#include <linux/mm.h>
5#include <linux/sched.h>
6#include <asm/processor.h>
7#include <asm/system.h>
8
9static inline void __flush_tlb(void)
10{
11 write_cr3(read_cr3());
12}
13
14static inline void __flush_tlb_all(void)
15{
16 unsigned long cr4 = read_cr4();
17 write_cr4(cr4 & ~X86_CR4_PGE); /* clear PGE */
18 write_cr4(cr4); /* write old PGE again and flush TLBs */
19}
20
21#define __flush_tlb_one(addr) \
22 __asm__ __volatile__("invlpg (%0)" :: "r" (addr) : "memory")
23
24
25/*
26 * TLB flushing:
27 *
28 * - flush_tlb() flushes the current mm struct TLBs
29 * - flush_tlb_all() flushes all processes TLBs
30 * - flush_tlb_mm(mm) flushes the specified mm context TLB's
31 * - flush_tlb_page(vma, vmaddr) flushes one page
32 * - flush_tlb_range(vma, start, end) flushes a range of pages
33 * - flush_tlb_kernel_range(start, end) flushes a range of kernel pages
34 *
35 * x86-64 can only flush individual pages or full VMs. For a range flush
36 * we always do the full VM. Might be worth trying if for a small
37 * range a few INVLPGs in a row are a win.
38 */
39
40#ifndef CONFIG_SMP
41
42#define flush_tlb() __flush_tlb()
43#define flush_tlb_all() __flush_tlb_all()
44#define local_flush_tlb() __flush_tlb()
45
46static inline void flush_tlb_mm(struct mm_struct *mm)
47{
48 if (mm == current->active_mm)
49 __flush_tlb();
50}
51
52static inline void flush_tlb_page(struct vm_area_struct *vma,
53 unsigned long addr)
54{
55 if (vma->vm_mm == current->active_mm)
56 __flush_tlb_one(addr);
57}
58
59static inline void flush_tlb_range(struct vm_area_struct *vma,
60 unsigned long start, unsigned long end)
61{
62 if (vma->vm_mm == current->active_mm)
63 __flush_tlb();
64}
65
66#else
67
68#include <asm/smp.h>
69
70#define local_flush_tlb() \
71 __flush_tlb()
72
73extern void flush_tlb_all(void);
74extern void flush_tlb_current_task(void);
75extern void flush_tlb_mm(struct mm_struct *);
76extern void flush_tlb_page(struct vm_area_struct *, unsigned long);
77
78#define flush_tlb() flush_tlb_current_task()
79
80static inline void flush_tlb_range(struct vm_area_struct * vma, unsigned long start, unsigned long end)
81{
82 flush_tlb_mm(vma->vm_mm);
83}
84
85#define TLBSTATE_OK 1
86#define TLBSTATE_LAZY 2
87
88/* Roughly an IPI every 20MB with 4k pages for freeing page table
89 ranges. Cost is about 42k of memory for each CPU. */
90#define ARCH_FREE_PTE_NR 5350
91
92#endif
93
94static inline void flush_tlb_kernel_range(unsigned long start,
95 unsigned long end)
96{
97 flush_tlb_all();
98}
99
100#endif /* _X8664_TLBFLUSH_H */