1#ifndef _ASM_M32R_MMU_CONTEXT_H 2#define _ASM_M32R_MMU_CONTEXT_H 3#ifdef __KERNEL__ 4 5#include <asm/m32r.h> 6 7#define MMU_CONTEXT_ASID_MASK (0x000000FF) 8#define MMU_CONTEXT_VERSION_MASK (0xFFFFFF00) 9#define MMU_CONTEXT_FIRST_VERSION (0x00000100) 10#define NO_CONTEXT (0x00000000) 11 12#ifndef __ASSEMBLY__ 13 14#include <asm/atomic.h> 15#include <asm/pgalloc.h> 16#include <asm/mmu.h> 17#include <asm/tlbflush.h> 18#include <asm-generic/mm_hooks.h> 19 20/* 21 * Cache of MMU context last used. 22 */ 23#ifndef CONFIG_SMP 24extern unsigned long mmu_context_cache_dat; 25#define mmu_context_cache mmu_context_cache_dat 26#define mm_context(mm) mm->context 27#else /* not CONFIG_SMP */ 28extern unsigned long mmu_context_cache_dat[]; 29#define mmu_context_cache mmu_context_cache_dat[smp_processor_id()] 30#define mm_context(mm) mm->context[smp_processor_id()] 31#endif /* not CONFIG_SMP */ 32 33#define set_tlb_tag(entry, tag) (*entry = (tag & PAGE_MASK)|get_asid()) 34#define set_tlb_data(entry, data) (*entry = (data | _PAGE_PRESENT)) 35 36#ifdef CONFIG_MMU 37#define enter_lazy_tlb(mm, tsk) do { } while (0) 38 39static inline void get_new_mmu_context(struct mm_struct *mm) 40{ 41 unsigned long mc = ++mmu_context_cache; 42 43 if (!(mc & MMU_CONTEXT_ASID_MASK)) { 44 /* We exhaust ASID of this version. 45 Flush all TLB and start new cycle. */ 46 local_flush_tlb_all(); 47 /* Fix version if needed. 48 Note that we avoid version #0 to distingush NO_CONTEXT. */ 49 if (!mc) 50 mmu_context_cache = mc = MMU_CONTEXT_FIRST_VERSION; 51 } 52 mm_context(mm) = mc; 53} 54 55/* 56 * Get MMU context if needed. 57 */ 58static inline void get_mmu_context(struct mm_struct *mm) 59{ 60 if (mm) { 61 unsigned long mc = mmu_context_cache; 62 63 /* Check if we have old version of context. 64 If it's old, we need to get new context with new version. */ 65 if ((mm_context(mm) ^ mc) & MMU_CONTEXT_VERSION_MASK) 66 get_new_mmu_context(mm); 67 } 68} 69 70/* 71 * Initialize the context related info for a new mm_struct 72 * instance. 73 */ 74static inline int init_new_context(struct task_struct *tsk, 75 struct mm_struct *mm) 76{ 77#ifndef CONFIG_SMP 78 mm->context = NO_CONTEXT; 79#else /* CONFIG_SMP */ 80 int num_cpus = num_online_cpus(); 81 int i; 82 83 for (i = 0 ; i < num_cpus ; i++) 84 mm->context[i] = NO_CONTEXT; 85#endif /* CONFIG_SMP */ 86 87 return 0; 88} 89 90/* 91 * Destroy context related info for an mm_struct that is about 92 * to be put to rest. 93 */ 94#define destroy_context(mm) do { } while (0) 95 96static inline void set_asid(unsigned long asid) 97{ 98 *(volatile unsigned long *)MASID = (asid & MMU_CONTEXT_ASID_MASK); 99} 100 101static inline unsigned long get_asid(void) 102{ 103 unsigned long asid; 104 105 asid = *(volatile long *)MASID; 106 asid &= MMU_CONTEXT_ASID_MASK; 107 108 return asid; 109} 110 111/* 112 * After we have set current->mm to a new value, this activates 113 * the context for the new mm so we see the new mappings. 114 */ 115static inline void activate_context(struct mm_struct *mm) 116{ 117 get_mmu_context(mm); 118 set_asid(mm_context(mm) & MMU_CONTEXT_ASID_MASK); 119} 120 121static inline void switch_mm(struct mm_struct *prev, 122 struct mm_struct *next, struct task_struct *tsk) 123{ 124#ifdef CONFIG_SMP 125 int cpu = smp_processor_id(); 126#endif /* CONFIG_SMP */ 127 128 if (prev != next) { 129#ifdef CONFIG_SMP 130 cpumask_set_cpu(cpu, mm_cpumask(next)); 131#endif /* CONFIG_SMP */ 132 /* Set MPTB = next->pgd */ 133 *(volatile unsigned long *)MPTB = (unsigned long)next->pgd; 134 activate_context(next); 135 } 136#ifdef CONFIG_SMP 137 else 138 if (!cpumask_test_and_set_cpu(cpu, mm_cpumask(next))) 139 activate_context(next); 140#endif /* CONFIG_SMP */ 141} 142 143#define deactivate_mm(tsk, mm) do { } while (0) 144 145#define activate_mm(prev, next) \ 146 switch_mm((prev), (next), NULL) 147 148#else /* not CONFIG_MMU */ 149#define get_mmu_context(mm) do { } while (0) 150#define init_new_context(tsk,mm) (0) 151#define destroy_context(mm) do { } while (0) 152#define set_asid(asid) do { } while (0) 153#define get_asid() (0) 154#define activate_context(mm) do { } while (0) 155#define switch_mm(prev,next,tsk) do { } while (0) 156#define deactivate_mm(mm,tsk) do { } while (0) 157#define activate_mm(prev,next) do { } while (0) 158#define enter_lazy_tlb(mm,tsk) do { } while (0) 159#endif /* not CONFIG_MMU */ 160 161#endif /* not __ASSEMBLY__ */ 162 163#endif /* __KERNEL__ */ 164#endif /* _ASM_M32R_MMU_CONTEXT_H */ 165