2024-09-09 08:52:07 +00:00
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/*
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* linux/arch/unicore32/include/asm/pgalloc.h
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*
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* Code specific to PKUnity SoC and UniCore ISA
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*
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* Copyright (C) 2001-2010 GUAN Xue-tao
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __UNICORE_PGALLOC_H__
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#define __UNICORE_PGALLOC_H__
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#include <asm/pgtable-hwdef.h>
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#include <asm/processor.h>
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#include <asm/cacheflush.h>
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#include <asm/tlbflush.h>
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#define check_pgt_cache() do { } while (0)
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#define _PAGE_USER_TABLE (PMD_TYPE_TABLE | PMD_PRESENT)
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#define _PAGE_KERNEL_TABLE (PMD_TYPE_TABLE | PMD_PRESENT)
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extern pgd_t *get_pgd_slow(struct mm_struct *mm);
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extern void free_pgd_slow(struct mm_struct *mm, pgd_t *pgd);
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#define pgd_alloc(mm) get_pgd_slow(mm)
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#define pgd_free(mm, pgd) free_pgd_slow(mm, pgd)
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#define PGALLOC_GFP (GFP_KERNEL | __GFP_NOTRACK | __GFP_REPEAT | __GFP_ZERO)
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/*
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* Allocate one PTE table.
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*/
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static inline pte_t *
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pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr)
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{
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pte_t *pte;
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pte = (pte_t *)__get_free_page(PGALLOC_GFP);
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if (pte)
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clean_dcache_area(pte, PTRS_PER_PTE * sizeof(pte_t));
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return pte;
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}
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static inline pgtable_t
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pte_alloc_one(struct mm_struct *mm, unsigned long addr)
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{
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struct page *pte;
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pte = alloc_pages(PGALLOC_GFP, 0);
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2024-09-09 08:57:42 +00:00
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if (!pte)
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return NULL;
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if (!PageHighMem(pte)) {
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void *page = page_address(pte);
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clean_dcache_area(page, PTRS_PER_PTE * sizeof(pte_t));
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}
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if (!pgtable_page_ctor(pte)) {
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__free_page(pte);
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2024-09-09 08:52:07 +00:00
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}
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return pte;
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}
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/*
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* Free one PTE table.
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*/
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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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if (pte)
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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 pte)
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{
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pgtable_page_dtor(pte);
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__free_page(pte);
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}
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static inline void __pmd_populate(pmd_t *pmdp, unsigned long pmdval)
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{
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set_pmd(pmdp, __pmd(pmdval));
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flush_pmd_entry(pmdp);
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}
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/*
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* Populate the pmdp entry with a pointer to the pte. This pmd is part
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* of the mm address space.
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*/
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static inline void
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pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
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{
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unsigned long pte_ptr = (unsigned long)ptep;
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/*
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* The pmd must be loaded with the physical
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* address of the PTE table
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*/
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__pmd_populate(pmdp, __pa(pte_ptr) | _PAGE_KERNEL_TABLE);
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}
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static inline void
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pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep)
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{
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__pmd_populate(pmdp,
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page_to_pfn(ptep) << PAGE_SHIFT | _PAGE_USER_TABLE);
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}
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#define pmd_pgtable(pmd) pmd_page(pmd)
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#endif
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