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2e1aecb970
This patch includes virtual memory layout, PHYS_OFFSET is defined as 0x0. It also includes the 4KB/8KB page size configurations and pte operations. Signed-off-by: Vincent Chen <vincentc@andestech.com> Signed-off-by: Greentime Hu <greentime@andestech.com> Acked-by: Arnd Bergmann <arnd@arndb.de>
96 lines
2.1 KiB
C
96 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2005-2017 Andes Technology Corporation
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#ifndef _ASMNDS32_PGALLOC_H
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#define _ASMNDS32_PGALLOC_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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#include <asm/proc-fns.h>
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/*
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* Since we have only two-level page tables, these are trivial
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*/
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#define pmd_alloc_one(mm, addr) ({ BUG(); ((pmd_t *)2); })
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#define pmd_free(mm, pmd) do { } while (0)
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#define pgd_populate(mm, pmd, pte) BUG()
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#define pmd_pgtable(pmd) pmd_page(pmd)
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extern pgd_t *pgd_alloc(struct mm_struct *mm);
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extern void pgd_free(struct mm_struct *mm, pgd_t * pgd);
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#define check_pgt_cache() do { } while (0)
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static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
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unsigned long addr)
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{
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pte_t *pte;
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pte =
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(pte_t *) __get_free_page(GFP_KERNEL | __GFP_RETRY_MAYFAIL |
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__GFP_ZERO);
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return pte;
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}
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static inline pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long addr)
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{
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pgtable_t pte;
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pte = alloc_pages(GFP_KERNEL | __GFP_RETRY_MAYFAIL | __GFP_ZERO, 0);
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if (pte)
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cpu_dcache_wb_page((unsigned long)page_address(pte));
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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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}
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static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
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{
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__free_page(pte);
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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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* Ensure that we always set both PMD entries.
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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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unsigned long pmdval;
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BUG_ON(mm != &init_mm);
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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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pmdval = __pa(pte_ptr) | _PAGE_KERNEL_TABLE;
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set_pmd(pmdp, __pmd(pmdval));
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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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unsigned long pmdval;
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BUG_ON(mm == &init_mm);
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pmdval = page_to_pfn(ptep) << PAGE_SHIFT | _PAGE_USER_TABLE;
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set_pmd(pmdp, __pmd(pmdval));
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}
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#endif
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