blob: 19f0c83d0792a24cc6fca9b45390c1c008f5ca98 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef __X86_64_MMU_CONTEXT_H
2#define __X86_64_MMU_CONTEXT_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/pda.h>
9#include <asm/pgtable.h>
10#include <asm/tlbflush.h>
11
12/*
13 * possibly do the LDT unload here?
14 */
15int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
16void destroy_context(struct mm_struct *mm);
17
Linus Torvalds1da177e2005-04-16 15:20:36 -070018static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
19{
Brian Gerste4b59392006-01-11 22:46:09 +010020#ifdef CONFIG_SMP
Linus Torvalds1da177e2005-04-16 15:20:36 -070021 if (read_pda(mmu_state) == TLBSTATE_OK)
22 write_pda(mmu_state, TLBSTATE_LAZY);
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#endif
Brian Gerste4b59392006-01-11 22:46:09 +010024}
Linus Torvalds1da177e2005-04-16 15:20:36 -070025
26static inline void load_cr3(pgd_t *pgd)
27{
28 asm volatile("movq %0,%%cr3" :: "r" (__pa(pgd)) : "memory");
29}
30
31static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
32 struct task_struct *tsk)
33{
34 unsigned cpu = smp_processor_id();
35 if (likely(prev != next)) {
36 /* stop flush ipis for the previous mm */
Akinobu Mita3d1712c2006-03-24 03:15:11 -080037 cpu_clear(cpu, prev->cpu_vm_mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -070038#ifdef CONFIG_SMP
39 write_pda(mmu_state, TLBSTATE_OK);
40 write_pda(active_mm, next);
41#endif
Akinobu Mita3d1712c2006-03-24 03:15:11 -080042 cpu_set(cpu, next->cpu_vm_mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -070043 load_cr3(next->pgd);
44
45 if (unlikely(next->context.ldt != prev->context.ldt))
46 load_LDT_nolock(&next->context, cpu);
47 }
48#ifdef CONFIG_SMP
49 else {
50 write_pda(mmu_state, TLBSTATE_OK);
51 if (read_pda(active_mm) != next)
52 out_of_line_bug();
Akinobu Mita3d1712c2006-03-24 03:15:11 -080053 if (!cpu_test_and_set(cpu, next->cpu_vm_mask)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070054 /* We were in lazy tlb mode and leave_mm disabled
55 * tlb flush IPI delivery. We must reload CR3
56 * to make sure to use no freed page tables.
57 */
58 load_cr3(next->pgd);
59 load_LDT_nolock(&next->context, cpu);
60 }
61 }
62#endif
63}
64
65#define deactivate_mm(tsk,mm) do { \
66 load_gs_index(0); \
67 asm volatile("movl %0,%%fs"::"r"(0)); \
68} while(0)
69
70#define activate_mm(prev, next) \
71 switch_mm((prev),(next),NULL)
72
73
74#endif