1 /* $Id: mmu_context.h,v 1.54 2002/02/09 19:49:31 davem Exp $ */
2 #ifndef __SPARC64_MMU_CONTEXT_H
3 #define __SPARC64_MMU_CONTEXT_H
5 /* Derived heavily from Linus's Alpha/AXP ASN code... */
9 #include <linux/spinlock.h>
10 #include <asm/system.h>
11 #include <asm/spitfire.h>
13 static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
17 extern spinlock_t ctx_alloc_lock;
18 extern unsigned long tlb_context_cache;
19 extern unsigned long mmu_context_bmap[];
21 extern void get_new_mmu_context(struct mm_struct *mm);
22 extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
23 extern void destroy_context(struct mm_struct *mm);
25 extern unsigned long tsb_context_switch(unsigned long pgd_pa, unsigned long *tsb);
27 /* Set MMU context in the actual hardware. */
28 #define load_secondary_context(__mm) \
29 __asm__ __volatile__("stxa %0, [%1] %2\n\t" \
32 : "r" (CTX_HWBITS((__mm)->context)), \
33 "r" (SECONDARY_CONTEXT), "i" (ASI_DMMU))
35 extern void __flush_tlb_mm(unsigned long, unsigned long);
37 /* Switch the current MM context. */
38 static inline void switch_mm(struct mm_struct *old_mm, struct mm_struct *mm, struct task_struct *tsk)
40 unsigned long ctx_valid;
43 /* Note: page_table_lock is used here to serialize switch_mm
44 * and activate_mm, and their calls to get_new_mmu_context.
45 * This use of page_table_lock is unrelated to its other uses.
47 spin_lock(&mm->page_table_lock);
48 ctx_valid = CTX_VALID(mm->context);
50 get_new_mmu_context(mm);
51 spin_unlock(&mm->page_table_lock);
53 if (!ctx_valid || (old_mm != mm)) {
54 load_secondary_context(mm);
55 tsb_context_switch(__pa(mm->pgd),
56 mm->context.sparc64_tsb);
59 /* Even if (mm == old_mm) we _must_ check
60 * the cpu_vm_mask. If we do not we could
61 * corrupt the TLB state because of how
62 * smp_flush_tlb_{page,range,mm} on sparc64
63 * and lazy tlb switches work. -DaveM
65 cpu = smp_processor_id();
66 if (!ctx_valid || !cpu_isset(cpu, mm->cpu_vm_mask)) {
67 cpu_set(cpu, mm->cpu_vm_mask);
68 __flush_tlb_mm(CTX_HWBITS(mm->context),
73 #define deactivate_mm(tsk,mm) do { } while (0)
75 /* Activate a new MM instance for the current task. */
76 static inline void activate_mm(struct mm_struct *active_mm, struct mm_struct *mm)
80 /* Note: page_table_lock is used here to serialize switch_mm
81 * and activate_mm, and their calls to get_new_mmu_context.
82 * This use of page_table_lock is unrelated to its other uses.
84 spin_lock(&mm->page_table_lock);
85 if (!CTX_VALID(mm->context))
86 get_new_mmu_context(mm);
87 cpu = smp_processor_id();
88 if (!cpu_isset(cpu, mm->cpu_vm_mask))
89 cpu_set(cpu, mm->cpu_vm_mask);
90 spin_unlock(&mm->page_table_lock);
92 load_secondary_context(mm);
93 __flush_tlb_mm(CTX_HWBITS(mm->context), SECONDARY_CONTEXT);
94 tsb_context_switch(__pa(mm->pgd), mm->context.sparc64_tsb);
97 #endif /* !(__ASSEMBLY__) */
99 #endif /* !(__SPARC64_MMU_CONTEXT_H) */