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1da177e4 LT |
1 | #ifndef __X86_64_MMU_CONTEXT_H |
2 | #define __X86_64_MMU_CONTEXT_H | |
3 | ||
4 | #include <linux/config.h> | |
5 | #include <asm/desc.h> | |
6 | #include <asm/atomic.h> | |
7 | #include <asm/pgalloc.h> | |
8 | #include <asm/pda.h> | |
9 | #include <asm/pgtable.h> | |
10 | #include <asm/tlbflush.h> | |
11 | ||
12 | /* | |
13 | * possibly do the LDT unload here? | |
14 | */ | |
15 | int init_new_context(struct task_struct *tsk, struct mm_struct *mm); | |
16 | void destroy_context(struct mm_struct *mm); | |
17 | ||
18 | #ifdef CONFIG_SMP | |
19 | ||
20 | static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk) | |
21 | { | |
22 | if (read_pda(mmu_state) == TLBSTATE_OK) | |
23 | write_pda(mmu_state, TLBSTATE_LAZY); | |
24 | } | |
25 | #else | |
26 | static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk) | |
27 | { | |
28 | } | |
29 | #endif | |
30 | ||
31 | static inline void load_cr3(pgd_t *pgd) | |
32 | { | |
33 | asm volatile("movq %0,%%cr3" :: "r" (__pa(pgd)) : "memory"); | |
34 | } | |
35 | ||
36 | static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, | |
37 | struct task_struct *tsk) | |
38 | { | |
39 | unsigned cpu = smp_processor_id(); | |
40 | if (likely(prev != next)) { | |
41 | /* stop flush ipis for the previous mm */ | |
42 | clear_bit(cpu, &prev->cpu_vm_mask); | |
43 | #ifdef CONFIG_SMP | |
44 | write_pda(mmu_state, TLBSTATE_OK); | |
45 | write_pda(active_mm, next); | |
46 | #endif | |
47 | set_bit(cpu, &next->cpu_vm_mask); | |
48 | load_cr3(next->pgd); | |
49 | ||
50 | if (unlikely(next->context.ldt != prev->context.ldt)) | |
51 | load_LDT_nolock(&next->context, cpu); | |
52 | } | |
53 | #ifdef CONFIG_SMP | |
54 | else { | |
55 | write_pda(mmu_state, TLBSTATE_OK); | |
56 | if (read_pda(active_mm) != next) | |
57 | out_of_line_bug(); | |
58 | if(!test_and_set_bit(cpu, &next->cpu_vm_mask)) { | |
59 | /* We were in lazy tlb mode and leave_mm disabled | |
60 | * tlb flush IPI delivery. We must reload CR3 | |
61 | * to make sure to use no freed page tables. | |
62 | */ | |
63 | load_cr3(next->pgd); | |
64 | load_LDT_nolock(&next->context, cpu); | |
65 | } | |
66 | } | |
67 | #endif | |
68 | } | |
69 | ||
70 | #define deactivate_mm(tsk,mm) do { \ | |
71 | load_gs_index(0); \ | |
72 | asm volatile("movl %0,%%fs"::"r"(0)); \ | |
73 | } while(0) | |
74 | ||
75 | #define activate_mm(prev, next) \ | |
76 | switch_mm((prev),(next),NULL) | |
77 | ||
78 | ||
79 | #endif |