projects / mirror_ubuntu-disco-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 1965aae3 PA |
1 | #ifndef _ASM_X86_MMU_CONTEXT_H |
| 2 | #define _ASM_X86_MMU_CONTEXT_H | |
| c3c2fee3 JF |
3 | |
| 4 | #include <asm/desc.h> | |
| 5 | #include <asm/atomic.h> | |
| 6 | #include <asm/pgalloc.h> | |
| 7 | #include <asm/tlbflush.h> | |
| 8 | #include <asm/paravirt.h> | |
| 9 | #ifndef CONFIG_PARAVIRT | |
| 10 | #include <asm-generic/mm_hooks.h> | |
| 11 | ||
| 12 | static inline void paravirt_activate_mm(struct mm_struct *prev, | |
| 13 | struct mm_struct *next) | |
| 14 | { | |
| 15 | } | |
| 16 | #endif /* !CONFIG_PARAVIRT */ | |
| 17 | ||
| 18 | /* | |
| 19 | * Used for LDT copy/destruction. | |
| 20 | */ | |
| 21 | int init_new_context(struct task_struct *tsk, struct mm_struct *mm); | |
| 22 | void destroy_context(struct mm_struct *mm); | |
| 23 | ||
| 6826c8ff BG |
24 | |
| 25 | static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk) | |
| 26 | { | |
| 27 | #ifdef CONFIG_SMP | |
| 28 | if (percpu_read(cpu_tlbstate.state) == TLBSTATE_OK) | |
| 29 | percpu_write(cpu_tlbstate.state, TLBSTATE_LAZY); | |
| 30 | #endif | |
| 31 | } | |
| 32 | ||
| 33 | static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, | |
| 34 | struct task_struct *tsk) | |
| 35 | { | |
| 36 | unsigned cpu = smp_processor_id(); | |
| 37 | ||
| 38 | if (likely(prev != next)) { | |
| 39 | /* stop flush ipis for the previous mm */ | |
| 40 | cpu_clear(cpu, prev->cpu_vm_mask); | |
| 41 | #ifdef CONFIG_SMP | |
| 42 | percpu_write(cpu_tlbstate.state, TLBSTATE_OK); | |
| 43 | percpu_write(cpu_tlbstate.active_mm, next); | |
| 96a388de | 44 | #endif |
| 6826c8ff BG |
45 | cpu_set(cpu, next->cpu_vm_mask); |
| 46 | ||
| 47 | /* Re-load page tables */ | |
| 48 | load_cr3(next->pgd); | |
| 49 | ||
| 50 | /* | |
| 51 | * load the LDT, if the LDT is different: | |
| 52 | */ | |
| 53 | if (unlikely(prev->context.ldt != next->context.ldt)) | |
| 54 | load_LDT_nolock(&next->context); | |
| 55 | } | |
| 56 | #ifdef CONFIG_SMP | |
| 57 | else { | |
| 58 | percpu_write(cpu_tlbstate.state, TLBSTATE_OK); | |
| 59 | BUG_ON(percpu_read(cpu_tlbstate.active_mm) != next); | |
| 60 | ||
| 61 | if (!cpu_test_and_set(cpu, next->cpu_vm_mask)) { | |
| 62 | /* We were in lazy tlb mode and leave_mm disabled | |
| 63 | * tlb flush IPI delivery. We must reload CR3 | |
| 64 | * to make sure to use no freed page tables. | |
| 65 | */ | |
| 66 | load_cr3(next->pgd); | |
| 67 | load_LDT_nolock(&next->context); | |
| 68 | } | |
| 69 | } | |
| 70 | #endif | |
| 71 | } | |
| c3c2fee3 JF |
72 | |
| 73 | #define activate_mm(prev, next) \ | |
| 74 | do { \ | |
| 75 | paravirt_activate_mm((prev), (next)); \ | |
| 76 | switch_mm((prev), (next), NULL); \ | |
| 77 | } while (0); | |
| 78 | ||
| 6826c8ff BG |
79 | #ifdef CONFIG_X86_32 |
| 80 | #define deactivate_mm(tsk, mm) \ | |
| 81 | do { \ | |
| d9a89a26 | 82 | set_user_gs(task_pt_regs(tsk), 0); \ |
| 6826c8ff BG |
83 | } while (0) |
| 84 | #else | |
| 85 | #define deactivate_mm(tsk, mm) \ | |
| 86 | do { \ | |
| 87 | load_gs_index(0); \ | |
| 88 | loadsegment(fs, 0); \ | |
| 89 | } while (0) | |
| 90 | #endif | |
| c3c2fee3 | 91 | |
| 1965aae3 | 92 | #endif /* _ASM_X86_MMU_CONTEXT_H */ |