1 #ifndef __METAG_MMU_CONTEXT_H
2 #define __METAG_MMU_CONTEXT_H
3
4 #include <asm-generic/mm_hooks.h>
5
6 #include <asm/page.h>
7 #include <asm/mmu.h>
8 #include <asm/tlbflush.h>
9 #include <asm/cacheflush.h>
10
11 #include <linux/io.h>
12
enter_lazy_tlb(struct mm_struct * mm,struct task_struct * tsk)13 static inline void enter_lazy_tlb(struct mm_struct *mm,
14 struct task_struct *tsk)
15 {
16 }
17
init_new_context(struct task_struct * tsk,struct mm_struct * mm)18 static inline int init_new_context(struct task_struct *tsk,
19 struct mm_struct *mm)
20 {
21 #ifndef CONFIG_METAG_META21_MMU
22 /* We use context to store a pointer to the page holding the
23 * pgd of a process while it is running. While a process is not
24 * running the pgd and context fields should be equal.
25 */
26 mm->context.pgd_base = (unsigned long) mm->pgd;
27 #endif
28 #ifdef CONFIG_METAG_USER_TCM
29 INIT_LIST_HEAD(&mm->context.tcm);
30 #endif
31 return 0;
32 }
33
34 #ifdef CONFIG_METAG_USER_TCM
35
36 #include <linux/slab.h>
37 #include <asm/tcm.h>
38
destroy_context(struct mm_struct * mm)39 static inline void destroy_context(struct mm_struct *mm)
40 {
41 struct tcm_allocation *pos, *n;
42
43 list_for_each_entry_safe(pos, n, &mm->context.tcm, list) {
44 tcm_free(pos->tag, pos->addr, pos->size);
45 list_del(&pos->list);
46 kfree(pos);
47 }
48 }
49 #else
50 #define destroy_context(mm) do { } while (0)
51 #endif
52
53 #ifdef CONFIG_METAG_META21_MMU
load_pgd(pgd_t * pgd,int thread)54 static inline void load_pgd(pgd_t *pgd, int thread)
55 {
56 unsigned long phys0 = mmu_phys0_addr(thread);
57 unsigned long phys1 = mmu_phys1_addr(thread);
58
59 /*
60 * 0x900 2Gb address space
61 * The permission bits apply to MMU table region which gives a 2MB
62 * window into physical memory. We especially don't want userland to be
63 * able to access this.
64 */
65 metag_out32(0x900 | _PAGE_CACHEABLE | _PAGE_PRIV | _PAGE_WRITE |
66 _PAGE_PRESENT, phys0);
67 /* Set new MMU base address */
68 metag_out32(__pa(pgd) & MMCU_TBLPHYS1_ADDR_BITS, phys1);
69 }
70 #endif
71
switch_mmu(struct mm_struct * prev,struct mm_struct * next)72 static inline void switch_mmu(struct mm_struct *prev, struct mm_struct *next)
73 {
74 #ifdef CONFIG_METAG_META21_MMU
75 load_pgd(next->pgd, hard_processor_id());
76 #else
77 unsigned int i;
78
79 /* prev->context == prev->pgd in the case where we are initially
80 switching from the init task to the first process. */
81 if (prev->context.pgd_base != (unsigned long) prev->pgd) {
82 for (i = FIRST_USER_PGD_NR; i < USER_PTRS_PER_PGD; i++)
83 ((pgd_t *) prev->context.pgd_base)[i] = prev->pgd[i];
84 } else
85 prev->pgd = (pgd_t *)mmu_get_base();
86
87 next->pgd = prev->pgd;
88 prev->pgd = (pgd_t *) prev->context.pgd_base;
89
90 for (i = FIRST_USER_PGD_NR; i < USER_PTRS_PER_PGD; i++)
91 next->pgd[i] = ((pgd_t *) next->context.pgd_base)[i];
92
93 flush_cache_all();
94 #endif
95 flush_tlb_all();
96 }
97
switch_mm(struct mm_struct * prev,struct mm_struct * next,struct task_struct * tsk)98 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
99 struct task_struct *tsk)
100 {
101 if (prev != next)
102 switch_mmu(prev, next);
103 }
104
activate_mm(struct mm_struct * prev_mm,struct mm_struct * next_mm)105 static inline void activate_mm(struct mm_struct *prev_mm,
106 struct mm_struct *next_mm)
107 {
108 switch_mmu(prev_mm, next_mm);
109 }
110
111 #define deactivate_mm(tsk, mm) do { } while (0)
112
113 #endif
114