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28 | 28 | ||
29 | #include <genarch/mm/page_ht.h> |
29 | #include <genarch/mm/page_ht.h> |
30 | #include <mm/page.h> |
30 | #include <mm/page.h> |
31 | #include <mm/frame.h> |
31 | #include <mm/frame.h> |
32 | #include <mm/heap.h> |
32 | #include <mm/heap.h> |
- | 33 | #include <mm/as.h> |
|
33 | #include <arch/mm/asid.h> |
34 | #include <arch/mm/asid.h> |
34 | #include <arch/types.h> |
35 | #include <arch/types.h> |
35 | #include <typedefs.h> |
36 | #include <typedefs.h> |
36 | #include <arch/asm.h> |
37 | #include <arch/asm.h> |
37 | #include <synch/spinlock.h> |
38 | #include <synch/spinlock.h> |
Line 50... | Line 51... | ||
50 | * Page hash table pointer. |
51 | * Page hash table pointer. |
51 | * The page hash table may be accessed only when page_ht_lock is held. |
52 | * The page hash table may be accessed only when page_ht_lock is held. |
52 | */ |
53 | */ |
53 | pte_t *page_ht = NULL; |
54 | pte_t *page_ht = NULL; |
54 | 55 | ||
55 | static void ht_mapping_insert(__address page, asid_t asid, __address frame, int flags, __address root); |
56 | static void ht_mapping_insert(as_t *as, __address page, __address frame, int flags, __address root); |
56 | static pte_t *ht_mapping_find(__address page, asid_t asid, __address root); |
57 | static pte_t *ht_mapping_find(as_t *as, __address page, __address root); |
57 | 58 | ||
58 | page_operations_t page_ht_operations = { |
59 | page_operations_t page_ht_operations = { |
59 | .mapping_insert = ht_mapping_insert, |
60 | .mapping_insert = ht_mapping_insert, |
60 | .mapping_find = ht_mapping_find |
61 | .mapping_find = ht_mapping_find |
61 | }; |
62 | }; |
Line 65... | Line 66... | ||
65 | * Map virtual address 'page' to physical address 'frame' |
66 | * Map virtual address 'page' to physical address 'frame' |
66 | * using 'flags'. In order not to disturb hardware searching, |
67 | * using 'flags'. In order not to disturb hardware searching, |
67 | * new mappings are appended to the end of the collision |
68 | * new mappings are appended to the end of the collision |
68 | * chain. |
69 | * chain. |
69 | * |
70 | * |
- | 71 | * @param as Address space to which page belongs. Must be locked prior the call. |
|
70 | * @param page Virtual address of the page to be mapped. |
72 | * @param page Virtual address of the page to be mapped. |
71 | * @param asid Address space to which page belongs. |
- | |
72 | * @param frame Physical address of memory frame to which the mapping is done. |
73 | * @param frame Physical address of memory frame to which the mapping is done. |
73 | * @param flags Flags to be used for mapping. |
74 | * @param flags Flags to be used for mapping. |
74 | * @param root Ignored. |
75 | * @param root Ignored. |
75 | */ |
76 | */ |
76 | void ht_mapping_insert(__address page, asid_t asid, __address frame, int flags, __address root) |
77 | void ht_mapping_insert(as_t *as, __address page, __address frame, int flags, __address root) |
77 | { |
78 | { |
78 | pte_t *t, *u; |
79 | pte_t *t, *u; |
79 | ipl_t ipl; |
80 | ipl_t ipl; |
80 | 81 | ||
81 | ipl = interrupts_disable(); |
82 | ipl = interrupts_disable(); |
82 | spinlock_lock(&page_ht_lock); |
83 | spinlock_lock(&page_ht_lock); |
83 | 84 | ||
84 | t = HT_HASH(page, asid); |
85 | t = HT_HASH(page, as->asid); |
85 | if (!HT_SLOT_EMPTY(t)) { |
86 | if (!HT_SLOT_EMPTY(t)) { |
86 | 87 | ||
87 | /* |
88 | /* |
88 | * The slot is occupied. |
89 | * The slot is occupied. |
89 | * Walk through the collision chain and append the mapping to its end. |
90 | * Walk through the collision chain and append the mapping to its end. |
90 | */ |
91 | */ |
91 | 92 | ||
92 | do { |
93 | do { |
93 | u = t; |
94 | u = t; |
94 | if (HT_COMPARE(page, asid, t)) { |
95 | if (HT_COMPARE(page, as->asid, t)) { |
95 | /* |
96 | /* |
96 | * Nothing to do, |
97 | * Nothing to do, |
97 | * the record is already there. |
98 | * the record is already there. |
98 | */ |
99 | */ |
99 | spinlock_unlock(&page_ht_lock); |
100 | spinlock_unlock(&page_ht_lock); |
Line 107... | Line 108... | ||
107 | panic("could not allocate memory\n"); |
108 | panic("could not allocate memory\n"); |
108 | 109 | ||
109 | HT_SET_NEXT(u, t); |
110 | HT_SET_NEXT(u, t); |
110 | } |
111 | } |
111 | 112 | ||
112 | HT_SET_RECORD(t, page, asid, frame, flags); |
113 | HT_SET_RECORD(t, page, as->asid, frame, flags); |
113 | HT_SET_NEXT(t, NULL); |
114 | HT_SET_NEXT(t, NULL); |
114 | 115 | ||
115 | spinlock_unlock(&page_ht_lock); |
116 | spinlock_unlock(&page_ht_lock); |
116 | interrupts_restore(ipl); |
117 | interrupts_restore(ipl); |
117 | } |
118 | } |
Line 120... | Line 121... | ||
120 | * |
121 | * |
121 | * Find mapping for virtual page. |
122 | * Find mapping for virtual page. |
122 | * |
123 | * |
123 | * Interrupts must be disabled. |
124 | * Interrupts must be disabled. |
124 | * |
125 | * |
- | 126 | * @param as Address space to wich page belongs. Must be locked prior the call. |
|
125 | * @param page Virtual page. |
127 | * @param page Virtual page. |
126 | * @param asid Address space to wich page belongs. |
- | |
127 | * @param root Ignored. |
128 | * @param root Ignored. |
128 | * |
129 | * |
129 | * @return NULL if there is no such mapping; requested mapping otherwise. |
130 | * @return NULL if there is no such mapping; requested mapping otherwise. |
130 | */ |
131 | */ |
131 | pte_t *ht_mapping_find(__address page, asid_t asid, __address root) |
132 | pte_t *ht_mapping_find(as_t *as, __address page, __address root) |
132 | { |
133 | { |
133 | pte_t *t; |
134 | pte_t *t; |
134 | 135 | ||
135 | spinlock_lock(&page_ht_lock); |
136 | spinlock_lock(&page_ht_lock); |
136 | t = HT_HASH(page, asid); |
137 | t = HT_HASH(page, as->asid); |
137 | if (!HT_SLOT_EMPTY(t)) { |
138 | if (!HT_SLOT_EMPTY(t)) { |
138 | while (!HT_COMPARE(page, asid, t) && HT_GET_NEXT(t)) |
139 | while (!HT_COMPARE(page, as->asid, t) && HT_GET_NEXT(t)) |
139 | t = HT_GET_NEXT(t); |
140 | t = HT_GET_NEXT(t); |
140 | t = HT_COMPARE(page, asid, t) ? t : NULL; |
141 | t = HT_COMPARE(page, as->asid, t) ? t : NULL; |
141 | } else { |
142 | } else { |
142 | t = NULL; |
143 | t = NULL; |
143 | } |
144 | } |
144 | spinlock_unlock(&page_ht_lock); |
145 | spinlock_unlock(&page_ht_lock); |
145 | return t; |
146 | return t; |