/*
* Allocate a page table. Note that we place the MEMC
* table before the page directory. This means we can
* easily get to both tightly-associated data structures
* with a single pointer.
*
* We actually only need 1152 bytes, 896 bytes is wasted.
* We could try to fit 7 PTEs into that slot somehow.
*/
static inline void *alloc_pgd_table(int priority)
{
unsigned long pg2k;
pg2k = get_page_2k(priority);
if (pg2k)
pg2k += MEMC_TABLE_SIZE;
return (void *)pg2k;
}
pte_t *get_pte_kernel_slow(pmd_t *pmd, unsigned long offset)
{
pte_t *pte;
pte = (pte_t *)get_page_2k(GFP_KERNEL);
if (pmd_none(*pmd)) {
if (pte) {
memzero(pte, 2 * PTRS_PER_PTE * BYTES_PER_PTR);
clean_cache_area(pte, PTRS_PER_PTE * BYTES_PER_PTR);
pte += PTRS_PER_PTE;
set_pmd(pmd, mk_kernel_pmd(pte));
return pte + offset;
}
set_pmd(pmd, mk_kernel_pmd(BAD_PAGETABLE));
return NULL;
}
free_page_2k((unsigned long)pte);
if (pmd_bad(*pmd)) {
__bad_pmd_kernel(pmd);
return NULL;
}
return (pte_t *) pmd_page(*pmd) + offset;
}
/*
* FIXME: the following over-allocates by 1600%
*/
static inline void *alloc_pte_table(int size, int prio)
{
if (size != 128)
printk("invalid table size\n");
return (void *)get_page_2k(prio);
}