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-rw-r--r--arch/m68k/include/asm/atomic.h10
-rw-r--r--arch/m68k/include/asm/mmu_context.h250
2 files changed, 211 insertions, 49 deletions
diff --git a/arch/m68k/include/asm/atomic.h b/arch/m68k/include/asm/atomic.h
index 65c6be6c8180..4eba796c00d4 100644
--- a/arch/m68k/include/asm/atomic.h
+++ b/arch/m68k/include/asm/atomic.h
@@ -55,6 +55,16 @@ static inline int atomic_dec_and_test(atomic_t *v)
55 return c != 0; 55 return c != 0;
56} 56}
57 57
58static inline int atomic_dec_and_test_lt(atomic_t *v)
59{
60 char c;
61 __asm__ __volatile__(
62 "subql #1,%1; slt %0"
63 : "=d" (c), "=m" (*v)
64 : "m" (*v));
65 return c != 0;
66}
67
58static inline int atomic_inc_and_test(atomic_t *v) 68static inline int atomic_inc_and_test(atomic_t *v)
59{ 69{
60 char c; 70 char c;
diff --git a/arch/m68k/include/asm/mmu_context.h b/arch/m68k/include/asm/mmu_context.h
index 7d4341e55a99..dc3be991d634 100644
--- a/arch/m68k/include/asm/mmu_context.h
+++ b/arch/m68k/include/asm/mmu_context.h
@@ -8,7 +8,206 @@ static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
8} 8}
9 9
10#ifdef CONFIG_MMU 10#ifdef CONFIG_MMU
11#ifndef CONFIG_SUN3 11
12#if defined(CONFIG_COLDFIRE)
13
14#include <asm/atomic.h>
15#include <asm/bitops.h>
16#include <asm/mcfmmu.h>
17#include <asm/mmu.h>
18
19#define NO_CONTEXT 256
20#define LAST_CONTEXT 255
21#define FIRST_CONTEXT 1
22
23extern unsigned long context_map[];
24extern mm_context_t next_mmu_context;
25
26extern atomic_t nr_free_contexts;
27extern struct mm_struct *context_mm[LAST_CONTEXT+1];
28extern void steal_context(void);
29
30static inline void get_mmu_context(struct mm_struct *mm)
31{
32 mm_context_t ctx;
33
34 if (mm->context != NO_CONTEXT)
35 return;
36 while (atomic_dec_and_test_lt(&nr_free_contexts)) {
37 atomic_inc(&nr_free_contexts);
38 steal_context();
39 }
40 ctx = next_mmu_context;
41 while (test_and_set_bit(ctx, context_map)) {
42 ctx = find_next_zero_bit(context_map, LAST_CONTEXT+1, ctx);
43 if (ctx > LAST_CONTEXT)
44 ctx = 0;
45 }
46 next_mmu_context = (ctx + 1) & LAST_CONTEXT;
47 mm->context = ctx;
48 context_mm[ctx] = mm;
49}
50
51/*
52 * Set up the context for a new address space.
53 */
54#define init_new_context(tsk, mm) (((mm)->context = NO_CONTEXT), 0)
55
56/*
57 * We're finished using the context for an address space.
58 */
59static inline void destroy_context(struct mm_struct *mm)
60{
61 if (mm->context != NO_CONTEXT) {
62 clear_bit(mm->context, context_map);
63 mm->context = NO_CONTEXT;
64 atomic_inc(&nr_free_contexts);
65 }
66}
67
68static inline void set_context(mm_context_t context, pgd_t *pgd)
69{
70 __asm__ __volatile__ ("movec %0,%%asid" : : "d" (context));
71}
72
73static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
74 struct task_struct *tsk)
75{
76 get_mmu_context(tsk->mm);
77 set_context(tsk->mm->context, next->pgd);
78}
79
80/*
81 * After we have set current->mm to a new value, this activates
82 * the context for the new mm so we see the new mappings.
83 */
84static inline void activate_mm(struct mm_struct *active_mm,
85 struct mm_struct *mm)
86{
87 get_mmu_context(mm);
88 set_context(mm->context, mm->pgd);
89}
90
91#define deactivate_mm(tsk, mm) do { } while (0)
92
93extern void mmu_context_init(void);
94#define prepare_arch_switch(next) load_ksp_mmu(next)
95
96static inline void load_ksp_mmu(struct task_struct *task)
97{
98 unsigned long flags;
99 struct mm_struct *mm;
100 int asid;
101 pgd_t *pgd;
102 pmd_t *pmd;
103 pte_t *pte;
104 unsigned long mmuar;
105
106 local_irq_save(flags);
107 mmuar = task->thread.ksp;
108
109 /* Search for a valid TLB entry, if one is found, don't remap */
110 mmu_write(MMUAR, mmuar);
111 mmu_write(MMUOR, MMUOR_STLB | MMUOR_ADR);
112 if (mmu_read(MMUSR) & MMUSR_HIT)
113 goto end;
114
115 if (mmuar >= PAGE_OFFSET) {
116 mm = &init_mm;
117 } else {
118 pr_info("load_ksp_mmu: non-kernel mm found: 0x%p\n", task->mm);
119 mm = task->mm;
120 }
121
122 if (!mm)
123 goto bug;
124
125 pgd = pgd_offset(mm, mmuar);
126 if (pgd_none(*pgd))
127 goto bug;
128
129 pmd = pmd_offset(pgd, mmuar);
130 if (pmd_none(*pmd))
131 goto bug;
132
133 pte = (mmuar >= PAGE_OFFSET) ? pte_offset_kernel(pmd, mmuar)
134 : pte_offset_map(pmd, mmuar);
135 if (pte_none(*pte) || !pte_present(*pte))
136 goto bug;
137
138 set_pte(pte, pte_mkyoung(*pte));
139 asid = mm->context & 0xff;
140 if (!pte_dirty(*pte) && mmuar <= PAGE_OFFSET)
141 set_pte(pte, pte_wrprotect(*pte));
142
143 mmu_write(MMUTR, (mmuar & PAGE_MASK) | (asid << MMUTR_IDN) |
144 (((int)(pte->pte) & (int)CF_PAGE_MMUTR_MASK)
145 >> CF_PAGE_MMUTR_SHIFT) | MMUTR_V);
146
147 mmu_write(MMUDR, (pte_val(*pte) & PAGE_MASK) |
148 ((pte->pte) & CF_PAGE_MMUDR_MASK) | MMUDR_SZ_8KB | MMUDR_X);
149
150 mmu_write(MMUOR, MMUOR_ACC | MMUOR_UAA);
151
152 goto end;
153
154bug:
155 pr_info("ksp load failed: mm=0x%p ksp=0x08%lx\n", mm, mmuar);
156end:
157 local_irq_restore(flags);
158}
159
160#elif defined(CONFIG_SUN3)
161#include <asm/sun3mmu.h>
162#include <linux/sched.h>
163
164extern unsigned long get_free_context(struct mm_struct *mm);
165extern void clear_context(unsigned long context);
166
167/* set the context for a new task to unmapped */
168static inline int init_new_context(struct task_struct *tsk,
169 struct mm_struct *mm)
170{
171 mm->context = SUN3_INVALID_CONTEXT;
172 return 0;
173}
174
175/* find the context given to this process, and if it hasn't already
176 got one, go get one for it. */
177static inline void get_mmu_context(struct mm_struct *mm)
178{
179 if (mm->context == SUN3_INVALID_CONTEXT)
180 mm->context = get_free_context(mm);
181}
182
183/* flush context if allocated... */
184static inline void destroy_context(struct mm_struct *mm)
185{
186 if (mm->context != SUN3_INVALID_CONTEXT)
187 clear_context(mm->context);
188}
189
190static inline void activate_context(struct mm_struct *mm)
191{
192 get_mmu_context(mm);
193 sun3_put_context(mm->context);
194}
195
196static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
197 struct task_struct *tsk)
198{
199 activate_context(tsk->mm);
200}
201
202#define deactivate_mm(tsk, mm) do { } while (0)
203
204static inline void activate_mm(struct mm_struct *prev_mm,
205 struct mm_struct *next_mm)
206{
207 activate_context(next_mm);
208}
209
210#else
12 211
13#include <asm/setup.h> 212#include <asm/setup.h>
14#include <asm/page.h> 213#include <asm/page.h>
@@ -103,55 +302,8 @@ static inline void activate_mm(struct mm_struct *prev_mm,
103 switch_mm_0460(next_mm); 302 switch_mm_0460(next_mm);
104} 303}
105 304
106#else /* CONFIG_SUN3 */
107#include <asm/sun3mmu.h>
108#include <linux/sched.h>
109
110extern unsigned long get_free_context(struct mm_struct *mm);
111extern void clear_context(unsigned long context);
112
113/* set the context for a new task to unmapped */
114static inline int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
115{
116 mm->context = SUN3_INVALID_CONTEXT;
117 return 0;
118}
119
120/* find the context given to this process, and if it hasn't already
121 got one, go get one for it. */
122static inline void get_mmu_context(struct mm_struct *mm)
123{
124 if(mm->context == SUN3_INVALID_CONTEXT)
125 mm->context = get_free_context(mm);
126}
127
128/* flush context if allocated... */
129static inline void destroy_context(struct mm_struct *mm)
130{
131 if(mm->context != SUN3_INVALID_CONTEXT)
132 clear_context(mm->context);
133}
134
135static inline void activate_context(struct mm_struct *mm)
136{
137 get_mmu_context(mm);
138 sun3_put_context(mm->context);
139}
140
141static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk)
142{
143 activate_context(tsk->mm);
144}
145
146#define deactivate_mm(tsk,mm) do { } while (0)
147
148static inline void activate_mm(struct mm_struct *prev_mm,
149 struct mm_struct *next_mm)
150{
151 activate_context(next_mm);
152}
153
154#endif 305#endif
306
155#else /* !CONFIG_MMU */ 307#else /* !CONFIG_MMU */
156 308
157static inline int init_new_context(struct task_struct *tsk, struct mm_struct *mm) 309static inline int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
generated by cgit v1.2.2 (git 2.25.0) at 2026-01-04 12:51:33 -0500