1 #ifndef _ASM_X86_MMU_CONTEXT_H
2 #define _ASM_X86_MMU_CONTEXT_H
5 #include <linux/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>
12 static inline void paravirt_activate_mm(struct mm_struct
*prev
,
13 struct mm_struct
*next
)
16 #endif /* !CONFIG_PARAVIRT */
19 * Used for LDT copy/destruction.
21 int init_new_context(struct task_struct
*tsk
, struct mm_struct
*mm
);
22 void destroy_context(struct mm_struct
*mm
);
25 static inline void enter_lazy_tlb(struct mm_struct
*mm
, struct task_struct
*tsk
)
28 if (this_cpu_read(cpu_tlbstate
.state
) == TLBSTATE_OK
)
29 this_cpu_write(cpu_tlbstate
.state
, TLBSTATE_LAZY
);
33 static inline void switch_mm(struct mm_struct
*prev
, struct mm_struct
*next
,
34 struct task_struct
*tsk
)
36 unsigned cpu
= smp_processor_id();
38 if (likely(prev
!= next
)) {
40 this_cpu_write(cpu_tlbstate
.state
, TLBSTATE_OK
);
41 this_cpu_write(cpu_tlbstate
.active_mm
, next
);
43 cpumask_set_cpu(cpu
, mm_cpumask(next
));
45 /* Re-load page tables */
48 /* Stop flush ipis for the previous mm */
49 cpumask_clear_cpu(cpu
, mm_cpumask(prev
));
51 /* Load the LDT, if the LDT is different: */
52 if (unlikely(prev
->context
.ldt
!= next
->context
.ldt
))
53 load_LDT_nolock(&next
->context
);
57 this_cpu_write(cpu_tlbstate
.state
, TLBSTATE_OK
);
58 BUG_ON(this_cpu_read(cpu_tlbstate
.active_mm
) != next
);
60 if (!cpumask_test_cpu(cpu
, mm_cpumask(next
))) {
62 * On established mms, the mm_cpumask is only changed
63 * from irq context, from ptep_clear_flush() while in
64 * lazy tlb mode, and here. Irqs are blocked during
65 * schedule, protecting us from simultaneous changes.
67 cpumask_set_cpu(cpu
, mm_cpumask(next
));
69 * We were in lazy tlb mode and leave_mm disabled
70 * tlb flush IPI delivery. We must reload CR3
71 * to make sure to use no freed page tables.
74 load_LDT_nolock(&next
->context
);
80 #define activate_mm(prev, next) \
82 paravirt_activate_mm((prev), (next)); \
83 switch_mm((prev), (next), NULL); \
87 #define deactivate_mm(tsk, mm) \
92 #define deactivate_mm(tsk, mm) \
99 #endif /* _ASM_X86_MMU_CONTEXT_H */