projects / GitHub / mt8127 / android_kernel_alcatel_ttab.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> | |
| 60063497 | 5 | #include <linux/atomic.h> |
| c3c2fee3 JF |
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)) { | |
| 6826c8ff BG |
39 | #ifdef CONFIG_SMP |
| 40 | percpu_write(cpu_tlbstate.state, TLBSTATE_OK); | |
| 41 | percpu_write(cpu_tlbstate.active_mm, next); | |
| 96a388de | 42 | #endif |
| 78f1c4d6 | 43 | cpumask_set_cpu(cpu, mm_cpumask(next)); |
| 6826c8ff BG |
44 | |
| 45 | /* Re-load page tables */ | |
| 46 | load_cr3(next->pgd); | |
| 47 | ||
| 831d52bc SS |
48 | /* stop flush ipis for the previous mm */ |
| 49 | cpumask_clear_cpu(cpu, mm_cpumask(prev)); | |
| 50 | ||
| 6826c8ff BG |
51 | /* |
| 52 | * load the LDT, if the LDT is different: | |
| 53 | */ | |
| 54 | if (unlikely(prev->context.ldt != next->context.ldt)) | |
| 55 | load_LDT_nolock(&next->context); | |
| 56 | } | |
| 57 | #ifdef CONFIG_SMP | |
| 58 | else { | |
| 59 | percpu_write(cpu_tlbstate.state, TLBSTATE_OK); | |
| 60 | BUG_ON(percpu_read(cpu_tlbstate.active_mm) != next); | |
| 61 | ||
| 78f1c4d6 | 62 | if (!cpumask_test_and_set_cpu(cpu, mm_cpumask(next))) { |
| 6826c8ff BG |
63 | /* We were in lazy tlb mode and leave_mm disabled |
| 64 | * tlb flush IPI delivery. We must reload CR3 | |
| 65 | * to make sure to use no freed page tables. | |
| 66 | */ | |
| 67 | load_cr3(next->pgd); | |
| 68 | load_LDT_nolock(&next->context); | |
| 69 | } | |
| 70 | } | |
| 71 | #endif | |
| 72 | } | |
| c3c2fee3 JF |
73 | |
| 74 | #define activate_mm(prev, next) \ | |
| 75 | do { \ | |
| 76 | paravirt_activate_mm((prev), (next)); \ | |
| 77 | switch_mm((prev), (next), NULL); \ | |
| 78 | } while (0); | |
| 79 | ||
| 6826c8ff BG |
80 | #ifdef CONFIG_X86_32 |
| 81 | #define deactivate_mm(tsk, mm) \ | |
| 82 | do { \ | |
| ccbeed3a | 83 | lazy_load_gs(0); \ |
| 6826c8ff BG |
84 | } while (0) |
| 85 | #else | |
| 86 | #define deactivate_mm(tsk, mm) \ | |
| 87 | do { \ | |
| 88 | load_gs_index(0); \ | |
| 89 | loadsegment(fs, 0); \ | |
| 90 | } while (0) | |
| 91 | #endif | |
| c3c2fee3 | 92 | |
| 1965aae3 | 93 | #endif /* _ASM_X86_MMU_CONTEXT_H */ |