/* SPDX-License-Identifier: GPL-2.0 */
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/* sun3_pgalloc.h --
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* reorganization around 2.3.39, routines moved from sun3_pgtable.h
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*
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*
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* 02/27/2002 -- Modified to support "highpte" implementation in 2.5.5 (Sam)
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*
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* moved 1/26/2000 Sam Creasey
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*/
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#ifndef _SUN3_PGALLOC_H
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#define _SUN3_PGALLOC_H
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#include <asm/tlb.h>
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extern const char bad_pmd_string[];
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#define pmd_alloc_one(mm,address) ({ BUG(); ((pmd_t *)2); })
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static 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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static inline void pte_free(struct mm_struct *mm, pgtable_t page)
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{
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pgtable_page_dtor(page);
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__free_page(page);
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}
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#define __pte_free_tlb(tlb,pte,addr) \
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do { \
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pgtable_page_dtor(pte); \
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tlb_remove_page((tlb), pte); \
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} while (0)
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static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
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unsigned long address)
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{
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unsigned long page = __get_free_page(GFP_KERNEL);
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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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static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
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unsigned long address)
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{
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struct page *page = alloc_pages(GFP_KERNEL, 0);
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if (page == NULL)
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return NULL;
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clear_highpage(page);
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if (!pgtable_page_ctor(page)) {
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__free_page(page);
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return NULL;
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}
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return page;
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}
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static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
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{
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pmd_val(*pmd) = __pa((unsigned long)pte);
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}
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static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, pgtable_t page)
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{
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pmd_val(*pmd) = __pa((unsigned long)page_address(page));
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}
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#define pmd_pgtable(pmd) pmd_page(pmd)
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/*
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* allocating and freeing a pmd is trivial: the 1-entry pmd is
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* inside the pgd, so has no extra memory associated with it.
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*/
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#define pmd_free(mm, x) do { } while (0)
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#define __pmd_free_tlb(tlb, x, addr) do { } while (0)
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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_zeroed_page(GFP_KERNEL);
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memcpy(new_pgd, swapper_pg_dir, PAGE_SIZE);
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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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#define pgd_populate(mm, pmd, pte) BUG()
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#endif /* SUN3_PGALLOC_H */
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