1
2#ifndef __M68K_MMU_CONTEXT_H
3#define __M68K_MMU_CONTEXT_H
4
5#include <asm-generic/mm_hooks.h>
6#include <linux/mm_types.h>
7
8static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
9{
10}
11
12#ifdef CONFIG_MMU
13
14#if defined(CONFIG_COLDFIRE)
15
16#include <asm/atomic.h>
17#include <asm/bitops.h>
18#include <asm/mcfmmu.h>
19#include <asm/mmu.h>
20
21#define NO_CONTEXT 256
22#define LAST_CONTEXT 255
23#define FIRST_CONTEXT 1
24
25extern unsigned long context_map[];
26extern mm_context_t next_mmu_context;
27
28extern atomic_t nr_free_contexts;
29extern struct mm_struct *context_mm[LAST_CONTEXT+1];
30extern void steal_context(void);
31
32static inline void get_mmu_context(struct mm_struct *mm)
33{
34 mm_context_t ctx;
35
36 if (mm->context != NO_CONTEXT)
37 return;
38 while (atomic_dec_and_test_lt(&nr_free_contexts)) {
39 atomic_inc(&nr_free_contexts);
40 steal_context();
41 }
42 ctx = next_mmu_context;
43 while (test_and_set_bit(ctx, context_map)) {
44 ctx = find_next_zero_bit(context_map, LAST_CONTEXT+1, ctx);
45 if (ctx > LAST_CONTEXT)
46 ctx = 0;
47 }
48 next_mmu_context = (ctx + 1) & LAST_CONTEXT;
49 mm->context = ctx;
50 context_mm[ctx] = mm;
51}
52
53
54
55
56#define init_new_context(tsk, mm) (((mm)->context = NO_CONTEXT), 0)
57
58
59
60
61static inline void destroy_context(struct mm_struct *mm)
62{
63 if (mm->context != NO_CONTEXT) {
64 clear_bit(mm->context, context_map);
65 mm->context = NO_CONTEXT;
66 atomic_inc(&nr_free_contexts);
67 }
68}
69
70static inline void set_context(mm_context_t context, pgd_t *pgd)
71{
72 __asm__ __volatile__ ("movec %0,%%asid" : : "d" (context));
73}
74
75static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
76 struct task_struct *tsk)
77{
78 get_mmu_context(tsk->mm);
79 set_context(tsk->mm->context, next->pgd);
80}
81
82
83
84
85
86static inline void activate_mm(struct mm_struct *active_mm,
87 struct mm_struct *mm)
88{
89 get_mmu_context(mm);
90 set_context(mm->context, mm->pgd);
91}
92
93#define deactivate_mm(tsk, mm) do { } while (0)
94
95#define prepare_arch_switch(next) load_ksp_mmu(next)
96
97static inline void load_ksp_mmu(struct task_struct *task)
98{
99 unsigned long flags;
100 struct mm_struct *mm;
101 int asid;
102 pgd_t *pgd;
103 p4d_t *p4d;
104 pud_t *pud;
105 pmd_t *pmd;
106 pte_t *pte;
107 unsigned long mmuar;
108
109 local_irq_save(flags);
110 mmuar = task->thread.ksp;
111
112
113 mmu_write(MMUAR, mmuar);
114 mmu_write(MMUOR, MMUOR_STLB | MMUOR_ADR);
115 if (mmu_read(MMUSR) & MMUSR_HIT)
116 goto end;
117
118 if (mmuar >= PAGE_OFFSET) {
119 mm = &init_mm;
120 } else {
121 pr_info("load_ksp_mmu: non-kernel mm found: 0x%p\n", task->mm);
122 mm = task->mm;
123 }
124
125 if (!mm)
126 goto bug;
127
128 pgd = pgd_offset(mm, mmuar);
129 if (pgd_none(*pgd))
130 goto bug;
131
132 p4d = p4d_offset(pgd, mmuar);
133 if (p4d_none(*p4d))
134 goto bug;
135
136 pud = pud_offset(p4d, mmuar);
137 if (pud_none(*pud))
138 goto bug;
139
140 pmd = pmd_offset(pud, mmuar);
141 if (pmd_none(*pmd))
142 goto bug;
143
144 pte = (mmuar >= PAGE_OFFSET) ? pte_offset_kernel(pmd, mmuar)
145 : pte_offset_map(pmd, mmuar);
146 if (pte_none(*pte) || !pte_present(*pte))
147 goto bug;
148
149 set_pte(pte, pte_mkyoung(*pte));
150 asid = mm->context & 0xff;
151 if (!pte_dirty(*pte) && mmuar <= PAGE_OFFSET)
152 set_pte(pte, pte_wrprotect(*pte));
153
154 mmu_write(MMUTR, (mmuar & PAGE_MASK) | (asid << MMUTR_IDN) |
155 (((int)(pte->pte) & (int)CF_PAGE_MMUTR_MASK)
156 >> CF_PAGE_MMUTR_SHIFT) | MMUTR_V);
157
158 mmu_write(MMUDR, (pte_val(*pte) & PAGE_MASK) |
159 ((pte->pte) & CF_PAGE_MMUDR_MASK) | MMUDR_SZ_8KB | MMUDR_X);
160
161 mmu_write(MMUOR, MMUOR_ACC | MMUOR_UAA);
162
163 goto end;
164
165bug:
166 pr_info("ksp load failed: mm=0x%p ksp=0x08%lx\n", mm, mmuar);
167end:
168 local_irq_restore(flags);
169}
170
171#elif defined(CONFIG_SUN3)
172#include <asm/sun3mmu.h>
173#include <linux/sched.h>
174
175extern unsigned long get_free_context(struct mm_struct *mm);
176extern void clear_context(unsigned long context);
177
178
179static inline int init_new_context(struct task_struct *tsk,
180 struct mm_struct *mm)
181{
182 mm->context = SUN3_INVALID_CONTEXT;
183 return 0;
184}
185
186
187
188static inline void get_mmu_context(struct mm_struct *mm)
189{
190 if (mm->context == SUN3_INVALID_CONTEXT)
191 mm->context = get_free_context(mm);
192}
193
194
195static inline void destroy_context(struct mm_struct *mm)
196{
197 if (mm->context != SUN3_INVALID_CONTEXT)
198 clear_context(mm->context);
199}
200
201static inline void activate_context(struct mm_struct *mm)
202{
203 get_mmu_context(mm);
204 sun3_put_context(mm->context);
205}
206
207static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
208 struct task_struct *tsk)
209{
210 activate_context(tsk->mm);
211}
212
213#define deactivate_mm(tsk, mm) do { } while (0)
214
215static inline void activate_mm(struct mm_struct *prev_mm,
216 struct mm_struct *next_mm)
217{
218 activate_context(next_mm);
219}
220
221#else
222
223#include <asm/setup.h>
224#include <asm/page.h>
225#include <asm/pgalloc.h>
226
227static inline int init_new_context(struct task_struct *tsk,
228 struct mm_struct *mm)
229{
230 mm->context = virt_to_phys(mm->pgd);
231 return 0;
232}
233
234#define destroy_context(mm) do { } while(0)
235
236static inline void switch_mm_0230(struct mm_struct *mm)
237{
238 unsigned long crp[2] = {
239 0x80000000 | _PAGE_TABLE, mm->context
240 };
241 unsigned long tmp;
242
243 asm volatile (".chip 68030");
244
245
246 asm volatile (
247 "movec %%cacr,%0;"
248 "orw %1,%0; "
249 "movec %0,%%cacr"
250 : "=d" (tmp) : "di" (FLUSH_I_AND_D));
251
252
253
254
255
256
257 asm volatile (
258#ifdef CPU_M68030_ONLY
259 "pmovefd %0,%%crp; "
260 "pflush #0,#4"
261#else
262 "pmove %0,%%crp"
263#endif
264 : : "m" (crp[0]));
265
266 asm volatile (".chip 68k");
267}
268
269static inline void switch_mm_0460(struct mm_struct *mm)
270{
271 asm volatile (".chip 68040");
272
273
274 asm volatile ("pflushan");
275
276
277 asm volatile ("movec %0,%%urp" : : "r" (mm->context));
278
279 if (CPU_IS_060) {
280 unsigned long tmp;
281
282
283 asm volatile (
284 "movec %%cacr,%0; "
285 "orl %1,%0; "
286 "movec %0,%%cacr"
287 : "=d" (tmp): "di" (0x00200000));
288 }
289
290 asm volatile (".chip 68k");
291}
292
293static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk)
294{
295 if (prev != next) {
296 if (CPU_IS_020_OR_030)
297 switch_mm_0230(next);
298 else
299 switch_mm_0460(next);
300 }
301}
302
303#define deactivate_mm(tsk,mm) do { } while (0)
304
305static inline void activate_mm(struct mm_struct *prev_mm,
306 struct mm_struct *next_mm)
307{
308 next_mm->context = virt_to_phys(next_mm->pgd);
309
310 if (CPU_IS_020_OR_030)
311 switch_mm_0230(next_mm);
312 else
313 switch_mm_0460(next_mm);
314}
315
316#endif
317
318#else
319
320static inline int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
321{
322 return 0;
323}
324
325
326static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk)
327{
328}
329
330#define destroy_context(mm) do { } while (0)
331#define deactivate_mm(tsk,mm) do { } while (0)
332
333static inline void activate_mm(struct mm_struct *prev_mm, struct mm_struct *next_mm)
334{
335}
336
337#endif
338#endif
339