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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 422 | giacomo | 1 | #ifndef __I386_SCHED_H |
| 2 | #define __I386_SCHED_H |
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| 3 | |||
| 4 | #include <linux/config.h> |
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| 5 | #include <asm/desc.h> |
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| 6 | #include <asm/atomic.h> |
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| 7 | #include <asm/pgalloc.h> |
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| 8 | #include <asm/tlbflush.h> |
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| 9 | |||
| 10 | /* |
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| 11 | * Used for LDT copy/destruction. |
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| 12 | */ |
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| 13 | int init_new_context(struct task_struct *tsk, struct mm_struct *mm); |
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| 14 | void destroy_context(struct mm_struct *mm); |
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| 15 | |||
| 16 | |||
| 17 | static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk) |
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| 18 | { |
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| 19 | #ifdef CONFIG_SMP |
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| 20 | unsigned cpu = smp_processor_id(); |
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| 21 | if (cpu_tlbstate[cpu].state == TLBSTATE_OK) |
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| 22 | cpu_tlbstate[cpu].state = TLBSTATE_LAZY; |
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| 23 | #endif |
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| 24 | } |
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| 25 | |||
| 26 | static inline void switch_mm(struct mm_struct *prev, |
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| 27 | struct mm_struct *next, |
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| 28 | struct task_struct *tsk) |
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| 29 | { |
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| 30 | int cpu = smp_processor_id(); |
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| 31 | |||
| 32 | if (likely(prev != next)) { |
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| 33 | /* stop flush ipis for the previous mm */ |
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| 34 | cpu_clear(cpu, prev->cpu_vm_mask); |
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| 35 | #ifdef CONFIG_SMP |
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| 36 | cpu_tlbstate[cpu].state = TLBSTATE_OK; |
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| 37 | cpu_tlbstate[cpu].active_mm = next; |
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| 38 | #endif |
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| 39 | cpu_set(cpu, next->cpu_vm_mask); |
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| 40 | |||
| 41 | /* Re-load page tables */ |
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| 42 | load_cr3(next->pgd); |
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| 43 | |||
| 44 | /* |
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| 45 | * load the LDT, if the LDT is different: |
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| 46 | */ |
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| 47 | if (unlikely(prev->context.ldt != next->context.ldt)) |
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| 48 | load_LDT_nolock(&next->context, cpu); |
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| 49 | } |
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| 50 | #ifdef CONFIG_SMP |
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| 51 | else { |
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| 52 | cpu_tlbstate[cpu].state = TLBSTATE_OK; |
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| 53 | BUG_ON(cpu_tlbstate[cpu].active_mm != next); |
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| 54 | |||
| 55 | if (!cpu_test_and_set(cpu, next->cpu_vm_mask)) { |
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| 56 | /* We were in lazy tlb mode and leave_mm disabled |
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| 57 | * tlb flush IPI delivery. We must reload %cr3. |
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| 58 | */ |
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| 59 | load_cr3(next->pgd); |
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| 60 | load_LDT_nolock(&next->context, cpu); |
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| 61 | } |
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| 62 | } |
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| 63 | #endif |
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| 64 | } |
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| 65 | |||
| 66 | #define deactivate_mm(tsk, mm) \ |
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| 67 | asm("movl %0,%%fs ; movl %0,%%gs": :"r" (0)) |
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| 68 | |||
| 69 | #define activate_mm(prev, next) \ |
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| 70 | switch_mm((prev),(next),NULL) |
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| 71 | |||
| 72 | #endif |