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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#ifndef __X86_64_MMU_CONTEXT_H
2#define __X86_64_MMU_CONTEXT_H
3
4#include <asm/pda.h>
5
6static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
7{
8#ifdef CONFIG_SMP
9 if (read_pda(mmu_state) == TLBSTATE_OK)
10 write_pda(mmu_state, TLBSTATE_LAZY);
11#endif
12}
13
14static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
15 struct task_struct *tsk)
16{
17 unsigned cpu = smp_processor_id();
18 if (likely(prev != next)) {
19 /* stop flush ipis for the previous mm */
20 cpu_clear(cpu, prev->cpu_vm_mask);
21#ifdef CONFIG_SMP
22 write_pda(mmu_state, TLBSTATE_OK);
23 write_pda(active_mm, next);
24#endif
25 cpu_set(cpu, next->cpu_vm_mask);
26 load_cr3(next->pgd);
27
28 if (unlikely(next->context.ldt != prev->context.ldt))
29 load_LDT_nolock(&next->context);
30 }
31#ifdef CONFIG_SMP
32 else {
33 write_pda(mmu_state, TLBSTATE_OK);
34 if (read_pda(active_mm) != next)
35 BUG();
36 if (!cpu_test_and_set(cpu, next->cpu_vm_mask)) {
37 /* We were in lazy tlb mode and leave_mm disabled
38 * tlb flush IPI delivery. We must reload CR3
39 * to make sure to use no freed page tables.
40 */
41 load_cr3(next->pgd);
42 load_LDT_nolock(&next->context);
43 }
44 }
45#endif
46}
47
48#define deactivate_mm(tsk, mm) \
49do { \
50 load_gs_index(0); \
51 asm volatile("movl %0,%%fs"::"r"(0)); \
52} while (0)
53
54#endif