1/* sun3_pgalloc.h --
  2 * reorganization around 2.3.39, routines moved from sun3_pgtable.h
  3 *
  4 *
  5 * 02/27/2002 -- Modified to support "highpte" implementation in 2.5.5 (Sam)
  6 *
  7 * moved 1/26/2000 Sam Creasey
  8 */
  9
 10#ifndef _SUN3_PGALLOC_H
 11#define _SUN3_PGALLOC_H
 12
 13#include <asm/tlb.h>
 14
 15/* FIXME - when we get this compiling */
 16/* erm, now that it's compiling, what do we do with it? */
 17#define _KERNPG_TABLE 0
 18
 19extern const char bad_pmd_string[];
 20
 21#define pmd_alloc_one(mm,address)       ({ BUG(); ((pmd_t *)2); })
 22
 23
 24static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
 25{
 26        free_page((unsigned long) pte);
 27}
 28
 29static inline void pte_free(struct mm_struct *mm, pgtable_t page)
 30{
 31	pgtable_page_dtor(page);
 32        __free_page(page);
 33}
 34
 35#define __pte_free_tlb(tlb,pte,addr)			\
 36do {							\
 37	pgtable_page_dtor(pte);				\
 38	tlb_remove_page((tlb), pte);			\
 39} while (0)
 40
 41static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
 42					  unsigned long address)
 43{
 44	unsigned long page = __get_free_page(GFP_KERNEL|__GFP_REPEAT);
 45
 46	if (!page)
 47		return NULL;
 48
 49	memset((void *)page, 0, PAGE_SIZE);
 50	return (pte_t *) (page);
 51}
 52
 53static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
 54					unsigned long address)
 55{
 56        struct page *page = alloc_pages(GFP_KERNEL|__GFP_REPEAT, 0);
 57
 58	if (page == NULL)
 59		return NULL;
 60
 61	clear_highpage(page);
 62	pgtable_page_ctor(page);
 63	return page;
 64
 65}
 66
 67static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
 68{
 69	pmd_val(*pmd) = __pa((unsigned long)pte);
 70}
 71
 72static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, pgtable_t page)
 73{
 74	pmd_val(*pmd) = __pa((unsigned long)page_address(page));
 75}
 76#define pmd_pgtable(pmd) pmd_page(pmd)
 77
 78/*
 79 * allocating and freeing a pmd is trivial: the 1-entry pmd is
 80 * inside the pgd, so has no extra memory associated with it.
 81 */
 82#define pmd_free(mm, x)			do { } while (0)
 83#define __pmd_free_tlb(tlb, x, addr)	do { } while (0)
 84
 85static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
 86{
 87        free_page((unsigned long) pgd);
 88}
 89
 90static inline pgd_t * pgd_alloc(struct mm_struct *mm)
 91{
 92     pgd_t *new_pgd;
 93
 94     new_pgd = (pgd_t *)get_zeroed_page(GFP_KERNEL);
 95     memcpy(new_pgd, swapper_pg_dir, PAGE_SIZE);
 96     memset(new_pgd, 0, (PAGE_OFFSET >> PGDIR_SHIFT));
 97     return new_pgd;
 98}
 99
100#define pgd_populate(mm, pmd, pte) BUG()
101
102#endif /* SUN3_PGALLOC_H */