1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * linux/arch/unicore32/include/asm/pgalloc.h
5 * Code specific to PKUnity SoC and UniCore ISA
7 * Copyright (C) 2001-2010 GUAN Xue-tao
9 #ifndef __UNICORE_PGALLOC_H__
10 #define __UNICORE_PGALLOC_H__
12 #include <asm/pgtable-hwdef.h>
13 #include <asm/processor.h>
14 #include <asm/cacheflush.h>
15 #include <asm/tlbflush.h>
17 #define check_pgt_cache() do { } while (0)
19 #define _PAGE_USER_TABLE (PMD_TYPE_TABLE | PMD_PRESENT)
20 #define _PAGE_KERNEL_TABLE (PMD_TYPE_TABLE | PMD_PRESENT)
22 extern pgd_t *get_pgd_slow(struct mm_struct *mm);
23 extern void free_pgd_slow(struct mm_struct *mm, pgd_t *pgd);
25 #define pgd_alloc(mm) get_pgd_slow(mm)
26 #define pgd_free(mm, pgd) free_pgd_slow(mm, pgd)
28 #define PGALLOC_GFP (GFP_KERNEL | __GFP_ZERO)
31 * Allocate one PTE table.
34 pte_alloc_one_kernel(struct mm_struct *mm)
38 pte = (pte_t *)__get_free_page(PGALLOC_GFP);
40 clean_dcache_area(pte, PTRS_PER_PTE * sizeof(pte_t));
45 static inline pgtable_t
46 pte_alloc_one(struct mm_struct *mm)
50 pte = alloc_pages(PGALLOC_GFP, 0);
53 if (!PageHighMem(pte)) {
54 void *page = page_address(pte);
55 clean_dcache_area(page, PTRS_PER_PTE * sizeof(pte_t));
57 if (!pgtable_page_ctor(pte)) {
67 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
70 free_page((unsigned long)pte);
73 static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
75 pgtable_page_dtor(pte);
79 static inline void __pmd_populate(pmd_t *pmdp, unsigned long pmdval)
81 set_pmd(pmdp, __pmd(pmdval));
82 flush_pmd_entry(pmdp);
86 * Populate the pmdp entry with a pointer to the pte. This pmd is part
87 * of the mm address space.
90 pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
92 unsigned long pte_ptr = (unsigned long)ptep;
95 * The pmd must be loaded with the physical
96 * address of the PTE table
98 __pmd_populate(pmdp, __pa(pte_ptr) | _PAGE_KERNEL_TABLE);
102 pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep)
105 page_to_pfn(ptep) << PAGE_SHIFT | _PAGE_USER_TABLE);
107 #define pmd_pgtable(pmd) pmd_page(pmd)