94 lines
2.0 KiB
C
94 lines
2.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef M68K_MCF_PGALLOC_H
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#define M68K_MCF_PGALLOC_H
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#include <asm/tlb.h>
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#include <asm/tlbflush.h>
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extern inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
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{
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free_page((unsigned long) pte);
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}
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extern const char bad_pmd_string[];
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extern inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
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{
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unsigned long page = __get_free_page(GFP_DMA);
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if (!page)
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return NULL;
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memset((void *)page, 0, PAGE_SIZE);
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return (pte_t *) (page);
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}
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extern inline pmd_t *pmd_alloc_kernel(pgd_t *pgd, unsigned long address)
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{
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return (pmd_t *) pgd;
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}
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#define pmd_populate(mm, pmd, pte) (pmd_val(*pmd) = (unsigned long)(pte))
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#define pmd_populate_kernel pmd_populate
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static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t pgtable,
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unsigned long address)
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{
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struct page *page = virt_to_page(pgtable);
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pgtable_pte_page_dtor(page);
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__free_page(page);
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}
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static inline pgtable_t pte_alloc_one(struct mm_struct *mm)
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{
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struct page *page = alloc_pages(GFP_DMA, 0);
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pte_t *pte;
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if (!page)
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return NULL;
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if (!pgtable_pte_page_ctor(page)) {
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__free_page(page);
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return NULL;
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}
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pte = page_address(page);
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clear_page(pte);
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return pte;
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}
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static inline void pte_free(struct mm_struct *mm, pgtable_t pgtable)
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{
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struct page *page = virt_to_page(pgtable);
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pgtable_pte_page_dtor(page);
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__free_page(page);
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}
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/*
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* In our implementation, each pgd entry contains 1 pmd that is never allocated
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* or freed. pgd_present is always 1, so this should never be called. -NL
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*/
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#define pmd_free(mm, pmd) BUG()
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static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
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{
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free_page((unsigned long) pgd);
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}
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static inline pgd_t *pgd_alloc(struct mm_struct *mm)
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{
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pgd_t *new_pgd;
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new_pgd = (pgd_t *)__get_free_page(GFP_DMA | __GFP_NOWARN);
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if (!new_pgd)
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return NULL;
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memcpy(new_pgd, swapper_pg_dir, PTRS_PER_PGD * sizeof(pgd_t));
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memset(new_pgd, 0, PAGE_OFFSET >> PGDIR_SHIFT);
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return new_pgd;
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}
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#endif /* M68K_MCF_PGALLOC_H */
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