72,11 → 72,13 |
* @param addr Faulting virtual address. |
* @param access Access mode that caused the fault (i.e. read/write/exec). |
* |
* @return AS_PF_FAULT on failure (i.e. page fault) or AS_PF_OK on success (i.e. serviced). |
* @return AS_PF_FAULT on failure (i.e. page fault) or AS_PF_OK on success (i.e. |
* serviced). |
*/ |
int anon_page_fault(as_area_t *area, uintptr_t addr, pf_access_t access) |
{ |
uintptr_t frame; |
bool dirty = false; |
|
if (!as_area_check_access(area, access)) |
return AS_PF_FAULT; |
86,13 → 88,14 |
|
/* |
* The area is shared, chances are that the mapping can be found |
* in the pagemap of the address space area share info structure. |
* in the pagemap of the address space area share info |
* structure. |
* In the case that the pagemap does not contain the respective |
* mapping, a new frame is allocated and the mapping is created. |
*/ |
mutex_lock(&area->sh_info->lock); |
frame = (uintptr_t) btree_search(&area->sh_info->pagemap, |
ALIGN_DOWN(addr, PAGE_SIZE) - area->base, &leaf); |
ALIGN_DOWN(addr, PAGE_SIZE) - area->base, &leaf); |
if (!frame) { |
bool allocate = true; |
int i; |
102,7 → 105,8 |
* Just a small workaround. |
*/ |
for (i = 0; i < leaf->keys; i++) { |
if (leaf->key[i] == ALIGN_DOWN(addr, PAGE_SIZE)) { |
if (leaf->key[i] == |
ALIGN_DOWN(addr, PAGE_SIZE)) { |
allocate = false; |
break; |
} |
110,11 → 114,15 |
if (allocate) { |
frame = (uintptr_t) frame_alloc(ONE_FRAME, 0); |
memsetb(PA2KA(frame), FRAME_SIZE, 0); |
dirty = true; |
|
/* |
* Insert the address of the newly allocated frame to the pagemap. |
* Insert the address of the newly allocated |
* frame to the pagemap. |
*/ |
btree_insert(&area->sh_info->pagemap, ALIGN_DOWN(addr, PAGE_SIZE) - area->base, (void *) frame, leaf); |
btree_insert(&area->sh_info->pagemap, |
ALIGN_DOWN(addr, PAGE_SIZE) - area->base, |
(void *) frame, leaf); |
} |
} |
frame_reference_add(ADDR2PFN(frame)); |
137,12 → 145,13 |
*/ |
frame = (uintptr_t) frame_alloc(ONE_FRAME, 0); |
memsetb(PA2KA(frame), FRAME_SIZE, 0); |
dirty = true; |
} |
|
/* |
* Map 'page' to 'frame'. |
* Note that TLB shootdown is not attempted as only new information is being |
* inserted into page tables. |
* Note that TLB shootdown is not attempted as only new information is |
* being inserted into page tables. |
*/ |
page_mapping_insert(AS, addr, frame, as_area_get_flags(area)); |
if (!used_space_insert(area, ALIGN_DOWN(addr, PAGE_SIZE), 1)) |
162,9 → 171,6 |
void anon_frame_free(as_area_t *area, uintptr_t page, uintptr_t frame) |
{ |
frame_free(frame); |
#ifdef CONFIG_VIRT_IDX_DCACHE |
dcache_flush_frame(page, frame); |
#endif |
} |
|
/** Share the anonymous address space area. |
184,7 → 190,8 |
* Copy used portions of the area to sh_info's page map. |
*/ |
mutex_lock(&area->sh_info->lock); |
for (cur = area->used_space.leaf_head.next; cur != &area->used_space.leaf_head; cur = cur->next) { |
for (cur = area->used_space.leaf_head.next; |
cur != &area->used_space.leaf_head; cur = cur->next) { |
btree_node_t *node; |
int i; |
|
198,14 → 205,19 |
pte_t *pte; |
|
page_table_lock(area->as, false); |
pte = page_mapping_find(area->as, base + j*PAGE_SIZE); |
ASSERT(pte && PTE_VALID(pte) && PTE_PRESENT(pte)); |
btree_insert(&area->sh_info->pagemap, (base + j*PAGE_SIZE) - area->base, |
(void *) PTE_GET_FRAME(pte), NULL); |
pte = page_mapping_find(area->as, |
base + j * PAGE_SIZE); |
ASSERT(pte && PTE_VALID(pte) && |
PTE_PRESENT(pte)); |
btree_insert(&area->sh_info->pagemap, |
(base + j * PAGE_SIZE) - area->base, |
(void *) PTE_GET_FRAME(pte), NULL); |
page_table_unlock(area->as, false); |
frame_reference_add(ADDR2PFN(PTE_GET_FRAME(pte))); |
|
pfn_t pfn = ADDR2PFN(PTE_GET_FRAME(pte)); |
frame_reference_add(pfn); |
} |
|
|
} |
} |
mutex_unlock(&area->sh_info->lock); |