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 void __tsb_context_switch(unsigned long pgd_pa, unsigned long tsb_reg,
26 unsigned long tsb_vaddr, unsigned long tsb_pte);
28 static inline void tsb_context_switch(struct mm_struct *mm)
30 __tsb_context_switch(__pa(mm->pgd), mm->context.tsb_reg_val,
31 mm->context.tsb_map_vaddr,
32 mm->context.tsb_map_pte);
35 /* Set MMU context in the actual hardware. */
36 #define load_secondary_context(__mm) \
37 __asm__ __volatile__("stxa %0, [%1] %2\n\t" \
40 : "r" (CTX_HWBITS((__mm)->context)), \
41 "r" (SECONDARY_CONTEXT), "i" (ASI_DMMU))
43 extern void __flush_tlb_mm(unsigned long, unsigned long);
45 /* Switch the current MM context. */
46 static inline void switch_mm(struct mm_struct *old_mm, struct mm_struct *mm, struct task_struct *tsk)
48 unsigned long ctx_valid;
51 /* Note: page_table_lock is used here to serialize switch_mm
52 * and activate_mm, and their calls to get_new_mmu_context.
53 * This use of page_table_lock is unrelated to its other uses.
55 spin_lock(&mm->page_table_lock);
56 ctx_valid = CTX_VALID(mm->context);
58 get_new_mmu_context(mm);
59 spin_unlock(&mm->page_table_lock);
61 if (!ctx_valid || (old_mm != mm)) {
62 load_secondary_context(mm);
63 tsb_context_switch(mm);
66 /* Even if (mm == old_mm) we _must_ check
67 * the cpu_vm_mask. If we do not we could
68 * corrupt the TLB state because of how
69 * smp_flush_tlb_{page,range,mm} on sparc64
70 * and lazy tlb switches work. -DaveM
72 cpu = smp_processor_id();
73 if (!ctx_valid || !cpu_isset(cpu, mm->cpu_vm_mask)) {
74 cpu_set(cpu, mm->cpu_vm_mask);
75 __flush_tlb_mm(CTX_HWBITS(mm->context),
80 #define deactivate_mm(tsk,mm) do { } while (0)
82 /* Activate a new MM instance for the current task. */
83 static inline void activate_mm(struct mm_struct *active_mm, struct mm_struct *mm)
87 /* Note: page_table_lock is used here to serialize switch_mm
88 * and activate_mm, and their calls to get_new_mmu_context.
89 * This use of page_table_lock is unrelated to its other uses.
91 spin_lock(&mm->page_table_lock);
92 if (!CTX_VALID(mm->context))
93 get_new_mmu_context(mm);
94 cpu = smp_processor_id();
95 if (!cpu_isset(cpu, mm->cpu_vm_mask))
96 cpu_set(cpu, mm->cpu_vm_mask);
97 spin_unlock(&mm->page_table_lock);
99 load_secondary_context(mm);
100 __flush_tlb_mm(CTX_HWBITS(mm->context), SECONDARY_CONTEXT);
101 tsb_context_switch(mm);
104 #endif /* !(__ASSEMBLY__) */
106 #endif /* !(__SPARC64_MMU_CONTEXT_H) */