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