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1da177e4 LT |
1 | #ifndef __I386_SCHED_H |
2 | #define __I386_SCHED_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/tlbflush.h> | |
9 | ||
10 | /* | |
11 | * Used for LDT copy/destruction. | |
12 | */ | |
13 | int init_new_context(struct task_struct *tsk, struct mm_struct *mm); | |
14 | void destroy_context(struct mm_struct *mm); | |
15 | ||
16 | ||
17 | static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk) | |
18 | { | |
19 | #ifdef CONFIG_SMP | |
20 | unsigned cpu = smp_processor_id(); | |
21 | if (per_cpu(cpu_tlbstate, cpu).state == TLBSTATE_OK) | |
22 | per_cpu(cpu_tlbstate, cpu).state = TLBSTATE_LAZY; | |
23 | #endif | |
24 | } | |
25 | ||
26 | static inline void switch_mm(struct mm_struct *prev, | |
27 | struct mm_struct *next, | |
28 | struct task_struct *tsk) | |
29 | { | |
30 | int cpu = smp_processor_id(); | |
31 | ||
32 | if (likely(prev != next)) { | |
33 | /* stop flush ipis for the previous mm */ | |
34 | cpu_clear(cpu, prev->cpu_vm_mask); | |
35 | #ifdef CONFIG_SMP | |
36 | per_cpu(cpu_tlbstate, cpu).state = TLBSTATE_OK; | |
37 | per_cpu(cpu_tlbstate, cpu).active_mm = next; | |
38 | #endif | |
39 | cpu_set(cpu, next->cpu_vm_mask); | |
40 | ||
41 | /* Re-load page tables */ | |
42 | load_cr3(next->pgd); | |
43 | ||
44 | /* | |
45 | * load the LDT, if the LDT is different: | |
46 | */ | |
47 | if (unlikely(prev->context.ldt != next->context.ldt)) | |
48 | load_LDT_nolock(&next->context, cpu); | |
49 | } | |
50 | #ifdef CONFIG_SMP | |
51 | else { | |
52 | per_cpu(cpu_tlbstate, cpu).state = TLBSTATE_OK; | |
53 | BUG_ON(per_cpu(cpu_tlbstate, cpu).active_mm != next); | |
54 | ||
55 | if (!cpu_test_and_set(cpu, next->cpu_vm_mask)) { | |
56 | /* We were in lazy tlb mode and leave_mm disabled | |
57 | * tlb flush IPI delivery. We must reload %cr3. | |
58 | */ | |
59 | load_cr3(next->pgd); | |
60 | load_LDT_nolock(&next->context, cpu); | |
61 | } | |
62 | } | |
63 | #endif | |
64 | } | |
65 | ||
66 | #define deactivate_mm(tsk, mm) \ | |
67 | asm("movl %0,%%fs ; movl %0,%%gs": :"r" (0)) | |
68 | ||
69 | #define activate_mm(prev, next) \ | |
70 | switch_mm((prev),(next),NULL) | |
71 | ||
72 | #endif |