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implemented create_page_map()

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This commit is contained in:
Steffen Vogel 2013-11-14 12:25:52 +01:00
parent 14938ef7e1
commit cdcd9e7d20
1 changed files with 29 additions and 0 deletions
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29
arch/x86/mm/page64.c
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@ -101,6 +101,35 @@ static inline size_t map_to_virt(size_t addr)
{ {
return canonicalize(addr << (map_to_level(addr) * PAGE_MAP_SHIFT)); return canonicalize(addr << (map_to_level(addr) * PAGE_MAP_SHIFT));
} }
int create_page_map(task_t* task, int copy)
{
size_t phys;
uint32_t ret;
// fixed mapping for paging structures
page_map_t *current = (page_map_t*) PAGE_PML4;
page_map_t *new = (page_map_t*) (PAGE_PML4 - 0x1000);
// get new pml4 table
phys = get_page();
if (!phys) return -ENOMEM;
current->entries[PAGE_MAP_ENTRIES-2] = phys|KERN_TABLE;
new->entries[PAGE_MAP_ENTRIES-1] = phys|KERN_TABLE;
tlb_flush(); // ouch :(
spinlock_lock(&kslock);
ret = copy_page_map(current, new, copy);
spinlock_unlock(&kslock);
new->entries[PAGE_MAP_ENTRIES-1] = phys|KERN_TABLE;
current->entries[PAGE_MAP_ENTRIES-2] = 0;
task->page_map = (page_map_t*) phys;
kprintf("create_page_map: allocated %u page tables\n", ret);
return ret;
} }
int drop_page_map(void) int drop_page_map(void)