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/Ethereal-msm8939-beta9/arch/m68k/include/asm/mcf_pgalloc.h

https://bitbucket.org/MilosStamenkovic95/etherealos
C Header | 102 lines | 73 code | 25 blank | 4 comment | 5 complexity | 8d0e31a30d2fe0fddb60dcd1cd67540e MD5 | raw file
  1#ifndef M68K_MCF_PGALLOC_H
  2#define M68K_MCF_PGALLOC_H
  3
  4#include <asm/tlb.h>
  5#include <asm/tlbflush.h>
  6
  7extern inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
  8{
  9	free_page((unsigned long) pte);
 10}
 11
 12extern const char bad_pmd_string[];
 13
 14extern inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
 15	unsigned long address)
 16{
 17	unsigned long page = __get_free_page(GFP_DMA|__GFP_REPEAT);
 18
 19	if (!page)
 20		return NULL;
 21
 22	memset((void *)page, 0, PAGE_SIZE);
 23	return (pte_t *) (page);
 24}
 25
 26extern inline pmd_t *pmd_alloc_kernel(pgd_t *pgd, unsigned long address)
 27{
 28	return (pmd_t *) pgd;
 29}
 30
 31#define pmd_alloc_one_fast(mm, address) ({ BUG(); ((pmd_t *)1); })
 32#define pmd_alloc_one(mm, address)      ({ BUG(); ((pmd_t *)2); })
 33
 34#define pte_alloc_one_fast(mm, addr) pte_alloc_one(mm, addr)
 35
 36#define pmd_populate(mm, pmd, page) (pmd_val(*pmd) = \
 37	(unsigned long)(page_address(page)))
 38
 39#define pmd_populate_kernel(mm, pmd, pte) (pmd_val(*pmd) = (unsigned long)(pte))
 40
 41#define pmd_pgtable(pmd) pmd_page(pmd)
 42
 43static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t page,
 44				  unsigned long address)
 45{
 46	__free_page(page);
 47}
 48
 49#define __pmd_free_tlb(tlb, pmd, address) do { } while (0)
 50
 51static inline struct page *pte_alloc_one(struct mm_struct *mm,
 52	unsigned long address)
 53{
 54	struct page *page = alloc_pages(GFP_DMA|__GFP_REPEAT, 0);
 55	pte_t *pte;
 56
 57	if (!page)
 58		return NULL;
 59
 60	pte = kmap(page);
 61	if (pte) {
 62		clear_page(pte);
 63		__flush_page_to_ram(pte);
 64		flush_tlb_kernel_page(pte);
 65		nocache_page(pte);
 66	}
 67	kunmap(page);
 68
 69	return page;
 70}
 71
 72extern inline void pte_free(struct mm_struct *mm, struct page *page)
 73{
 74	__free_page(page);
 75}
 76
 77/*
 78 * In our implementation, each pgd entry contains 1 pmd that is never allocated
 79 * or freed.  pgd_present is always 1, so this should never be called. -NL
 80 */
 81#define pmd_free(mm, pmd) BUG()
 82
 83static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
 84{
 85	free_page((unsigned long) pgd);
 86}
 87
 88static inline pgd_t *pgd_alloc(struct mm_struct *mm)
 89{
 90	pgd_t *new_pgd;
 91
 92	new_pgd = (pgd_t *)__get_free_page(GFP_DMA | __GFP_NOWARN);
 93	if (!new_pgd)
 94		return NULL;
 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 /* M68K_MCF_PGALLOC_H */