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1da177e4 LT |
1 | #ifndef __X86_64_MMU_CONTEXT_H |
2 | #define __X86_64_MMU_CONTEXT_H | |
3 | ||
1da177e4 LT |
4 | #include <asm/desc.h> |
5 | #include <asm/atomic.h> | |
6 | #include <asm/pgalloc.h> | |
7 | #include <asm/pda.h> | |
8 | #include <asm/pgtable.h> | |
9 | #include <asm/tlbflush.h> | |
10 | ||
11 | /* | |
12 | * possibly do the LDT unload here? | |
13 | */ | |
14 | int init_new_context(struct task_struct *tsk, struct mm_struct *mm); | |
15 | void destroy_context(struct mm_struct *mm); | |
16 | ||
1da177e4 LT |
17 | static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk) |
18 | { | |
e4b5939a | 19 | #ifdef CONFIG_SMP |
1da177e4 LT |
20 | if (read_pda(mmu_state) == TLBSTATE_OK) |
21 | write_pda(mmu_state, TLBSTATE_LAZY); | |
1da177e4 | 22 | #endif |
e4b5939a | 23 | } |
1da177e4 LT |
24 | |
25 | static inline void load_cr3(pgd_t *pgd) | |
26 | { | |
27 | asm volatile("movq %0,%%cr3" :: "r" (__pa(pgd)) : "memory"); | |
28 | } | |
29 | ||
30 | static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, | |
31 | struct task_struct *tsk) | |
32 | { | |
33 | unsigned cpu = smp_processor_id(); | |
34 | if (likely(prev != next)) { | |
35 | /* stop flush ipis for the previous mm */ | |
3d1712c9 | 36 | cpu_clear(cpu, prev->cpu_vm_mask); |
1da177e4 LT |
37 | #ifdef CONFIG_SMP |
38 | write_pda(mmu_state, TLBSTATE_OK); | |
39 | write_pda(active_mm, next); | |
40 | #endif | |
3d1712c9 | 41 | cpu_set(cpu, next->cpu_vm_mask); |
1da177e4 LT |
42 | load_cr3(next->pgd); |
43 | ||
44 | if (unlikely(next->context.ldt != prev->context.ldt)) | |
45 | load_LDT_nolock(&next->context, cpu); | |
46 | } | |
47 | #ifdef CONFIG_SMP | |
48 | else { | |
49 | write_pda(mmu_state, TLBSTATE_OK); | |
50 | if (read_pda(active_mm) != next) | |
51 | out_of_line_bug(); | |
3d1712c9 | 52 | if (!cpu_test_and_set(cpu, next->cpu_vm_mask)) { |
1da177e4 LT |
53 | /* We were in lazy tlb mode and leave_mm disabled |
54 | * tlb flush IPI delivery. We must reload CR3 | |
55 | * to make sure to use no freed page tables. | |
56 | */ | |
57 | load_cr3(next->pgd); | |
58 | load_LDT_nolock(&next->context, cpu); | |
59 | } | |
60 | } | |
61 | #endif | |
62 | } | |
63 | ||
64 | #define deactivate_mm(tsk,mm) do { \ | |
65 | load_gs_index(0); \ | |
66 | asm volatile("movl %0,%%fs"::"r"(0)); \ | |
67 | } while(0) | |
68 | ||
69 | #define activate_mm(prev, next) \ | |
70 | switch_mm((prev),(next),NULL) | |
71 | ||
72 | ||
73 | #endif |