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1 | #ifndef __ASM_SH64_MMU_CONTEXT_H |
2 | #define __ASM_SH64_MMU_CONTEXT_H | |
3 | ||
4 | /* | |
5 | * This file is subject to the terms and conditions of the GNU General Public | |
6 | * License. See the file "COPYING" in the main directory of this archive | |
7 | * for more details. | |
8 | * | |
9 | * include/asm-sh64/mmu_context.h | |
10 | * | |
11 | * Copyright (C) 2000, 2001 Paolo Alberelli | |
12 | * Copyright (C) 2003 Paul Mundt | |
13 | * | |
14 | * ASID handling idea taken from MIPS implementation. | |
15 | * | |
16 | */ | |
17 | ||
18 | #ifndef __ASSEMBLY__ | |
19 | ||
20 | /* | |
21 | * Cache of MMU context last used. | |
22 | * | |
23 | * The MMU "context" consists of two things: | |
24 | * (a) TLB cache version (or cycle, top 24 bits of mmu_context_cache) | |
25 | * (b) ASID (Address Space IDentifier, bottom 8 bits of mmu_context_cache) | |
26 | */ | |
27 | extern unsigned long mmu_context_cache; | |
28 | ||
29 | #include <linux/config.h> | |
30 | #include <asm/page.h> | |
31 | ||
32 | ||
33 | /* Current mm's pgd */ | |
34 | extern pgd_t *mmu_pdtp_cache; | |
35 | ||
36 | #define SR_ASID_MASK 0xffffffffff00ffffULL | |
37 | #define SR_ASID_SHIFT 16 | |
38 | ||
39 | #define MMU_CONTEXT_ASID_MASK 0x000000ff | |
40 | #define MMU_CONTEXT_VERSION_MASK 0xffffff00 | |
41 | #define MMU_CONTEXT_FIRST_VERSION 0x00000100 | |
42 | #define NO_CONTEXT 0 | |
43 | ||
44 | /* ASID is 8-bit value, so it can't be 0x100 */ | |
45 | #define MMU_NO_ASID 0x100 | |
46 | ||
47 | ||
48 | /* | |
49 | * Virtual Page Number mask | |
50 | */ | |
51 | #define MMU_VPN_MASK 0xfffff000 | |
52 | ||
53 | extern __inline__ void | |
54 | get_new_mmu_context(struct mm_struct *mm) | |
55 | { | |
56 | extern void flush_tlb_all(void); | |
57 | extern void flush_cache_all(void); | |
58 | ||
59 | unsigned long mc = ++mmu_context_cache; | |
60 | ||
61 | if (!(mc & MMU_CONTEXT_ASID_MASK)) { | |
62 | /* We exhaust ASID of this version. | |
63 | Flush all TLB and start new cycle. */ | |
64 | flush_tlb_all(); | |
65 | /* We have to flush all caches as ASIDs are | |
66 | used in cache */ | |
67 | flush_cache_all(); | |
68 | /* Fix version if needed. | |
69 | Note that we avoid version #0/asid #0 to distingush NO_CONTEXT. */ | |
70 | if (!mc) | |
71 | mmu_context_cache = mc = MMU_CONTEXT_FIRST_VERSION; | |
72 | } | |
73 | mm->context = mc; | |
74 | } | |
75 | ||
76 | /* | |
77 | * Get MMU context if needed. | |
78 | */ | |
79 | static __inline__ void | |
80 | get_mmu_context(struct mm_struct *mm) | |
81 | { | |
82 | if (mm) { | |
83 | unsigned long mc = mmu_context_cache; | |
84 | /* Check if we have old version of context. | |
85 | If it's old, we need to get new context with new version. */ | |
86 | if ((mm->context ^ mc) & MMU_CONTEXT_VERSION_MASK) | |
87 | get_new_mmu_context(mm); | |
88 | } | |
89 | } | |
90 | ||
91 | /* | |
92 | * Initialize the context related info for a new mm_struct | |
93 | * instance. | |
94 | */ | |
95 | static inline int init_new_context(struct task_struct *tsk, | |
96 | struct mm_struct *mm) | |
97 | { | |
98 | mm->context = NO_CONTEXT; | |
99 | ||
100 | return 0; | |
101 | } | |
102 | ||
103 | /* | |
104 | * Destroy context related info for an mm_struct that is about | |
105 | * to be put to rest. | |
106 | */ | |
107 | static inline void destroy_context(struct mm_struct *mm) | |
108 | { | |
109 | extern void flush_tlb_mm(struct mm_struct *mm); | |
110 | ||
111 | /* Well, at least free TLB entries */ | |
112 | flush_tlb_mm(mm); | |
113 | } | |
114 | ||
115 | #endif /* __ASSEMBLY__ */ | |
116 | ||
117 | /* Common defines */ | |
118 | #define TLB_STEP 0x00000010 | |
119 | #define TLB_PTEH 0x00000000 | |
120 | #define TLB_PTEL 0x00000008 | |
121 | ||
122 | /* PTEH defines */ | |
123 | #define PTEH_ASID_SHIFT 2 | |
124 | #define PTEH_VALID 0x0000000000000001 | |
125 | #define PTEH_SHARED 0x0000000000000002 | |
126 | #define PTEH_MATCH_ASID 0x00000000000003ff | |
127 | ||
128 | #ifndef __ASSEMBLY__ | |
129 | /* This has to be a common function because the next location to fill | |
130 | * information is shared. */ | |
131 | extern void __do_tlb_refill(unsigned long address, unsigned long long is_text_not_data, pte_t *pte); | |
132 | ||
133 | /* Profiling counter. */ | |
134 | #ifdef CONFIG_SH64_PROC_TLB | |
135 | extern unsigned long long calls_to_do_fast_page_fault; | |
136 | #endif | |
137 | ||
138 | static inline unsigned long get_asid(void) | |
139 | { | |
140 | unsigned long long sr; | |
141 | ||
142 | asm volatile ("getcon " __SR ", %0\n\t" | |
143 | : "=r" (sr)); | |
144 | ||
145 | sr = (sr >> SR_ASID_SHIFT) & MMU_CONTEXT_ASID_MASK; | |
146 | return (unsigned long) sr; | |
147 | } | |
148 | ||
149 | /* Set ASID into SR */ | |
150 | static inline void set_asid(unsigned long asid) | |
151 | { | |
152 | unsigned long long sr, pc; | |
153 | ||
154 | asm volatile ("getcon " __SR ", %0" : "=r" (sr)); | |
155 | ||
156 | sr = (sr & SR_ASID_MASK) | (asid << SR_ASID_SHIFT); | |
157 | ||
158 | /* | |
159 | * It is possible that this function may be inlined and so to avoid | |
160 | * the assembler reporting duplicate symbols we make use of the gas trick | |
161 | * of generating symbols using numerics and forward reference. | |
162 | */ | |
163 | asm volatile ("movi 1, %1\n\t" | |
164 | "shlli %1, 28, %1\n\t" | |
165 | "or %0, %1, %1\n\t" | |
166 | "putcon %1, " __SR "\n\t" | |
167 | "putcon %0, " __SSR "\n\t" | |
168 | "movi 1f, %1\n\t" | |
169 | "ori %1, 1 , %1\n\t" | |
170 | "putcon %1, " __SPC "\n\t" | |
171 | "rte\n" | |
172 | "1:\n\t" | |
173 | : "=r" (sr), "=r" (pc) : "0" (sr)); | |
174 | } | |
175 | ||
176 | /* | |
177 | * After we have set current->mm to a new value, this activates | |
178 | * the context for the new mm so we see the new mappings. | |
179 | */ | |
180 | static __inline__ void activate_context(struct mm_struct *mm) | |
181 | { | |
182 | get_mmu_context(mm); | |
183 | set_asid(mm->context & MMU_CONTEXT_ASID_MASK); | |
184 | } | |
185 | ||
186 | ||
187 | static __inline__ void switch_mm(struct mm_struct *prev, | |
188 | struct mm_struct *next, | |
189 | struct task_struct *tsk) | |
190 | { | |
191 | if (prev != next) { | |
192 | mmu_pdtp_cache = next->pgd; | |
193 | activate_context(next); | |
194 | } | |
195 | } | |
196 | ||
197 | #define deactivate_mm(tsk,mm) do { } while (0) | |
198 | ||
199 | #define activate_mm(prev, next) \ | |
200 | switch_mm((prev),(next),NULL) | |
201 | ||
202 | static inline void | |
203 | enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk) | |
204 | { | |
205 | } | |
206 | ||
207 | #endif /* __ASSEMBLY__ */ | |
208 | ||
209 | #endif /* __ASM_SH64_MMU_CONTEXT_H */ |