Linux kernel mirror (for testing)
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linux
1/* SPDX-License-Identifier: GPL-2.0 */
2// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
3
4#ifndef __ASM_CSKY_PGALLOC_H
5#define __ASM_CSKY_PGALLOC_H
6
7#include <linux/highmem.h>
8#include <linux/mm.h>
9#include <linux/sched.h>
10
11static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
12 pte_t *pte)
13{
14 set_pmd(pmd, __pmd(__pa(pte)));
15}
16
17static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
18 pgtable_t pte)
19{
20 set_pmd(pmd, __pmd(__pa(page_address(pte))));
21}
22
23#define pmd_pgtable(pmd) pmd_page(pmd)
24
25extern void pgd_init(unsigned long *p);
26
27static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
28{
29 pte_t *pte;
30 unsigned long i;
31
32 pte = (pte_t *) __get_free_page(GFP_KERNEL);
33 if (!pte)
34 return NULL;
35
36 for (i = 0; i < PAGE_SIZE/sizeof(pte_t); i++)
37 (pte + i)->pte_low = _PAGE_GLOBAL;
38
39 return pte;
40}
41
42static inline struct page *pte_alloc_one(struct mm_struct *mm)
43{
44 struct page *pte;
45
46 pte = alloc_pages(GFP_KERNEL | __GFP_ZERO, 0);
47 if (!pte)
48 return NULL;
49
50 if (!pgtable_page_ctor(pte)) {
51 __free_page(pte);
52 return NULL;
53 }
54
55 return pte;
56}
57
58static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
59{
60 free_pages((unsigned long)pte, PTE_ORDER);
61}
62
63static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
64{
65 pgtable_page_dtor(pte);
66 __free_pages(pte, PTE_ORDER);
67}
68
69static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
70{
71 free_pages((unsigned long)pgd, PGD_ORDER);
72}
73
74static inline pgd_t *pgd_alloc(struct mm_struct *mm)
75{
76 pgd_t *ret;
77 pgd_t *init;
78
79 ret = (pgd_t *) __get_free_pages(GFP_KERNEL, PGD_ORDER);
80 if (ret) {
81 init = pgd_offset(&init_mm, 0UL);
82 pgd_init((unsigned long *)ret);
83 memcpy(ret + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD,
84 (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
85 /* prevent out of order excute */
86 smp_mb();
87#ifdef CONFIG_CPU_NEED_TLBSYNC
88 dcache_wb_range((unsigned int)ret,
89 (unsigned int)(ret + PTRS_PER_PGD));
90#endif
91 }
92
93 return ret;
94}
95
96#define __pte_free_tlb(tlb, pte, address) \
97do { \
98 pgtable_page_dtor(pte); \
99 tlb_remove_page(tlb, pte); \
100} while (0)
101
102#define check_pgt_cache() do {} while (0)
103
104extern void pagetable_init(void);
105extern void pre_mmu_init(void);
106extern void pre_trap_init(void);
107
108#endif /* __ASM_CSKY_PGALLOC_H */