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 unsigned long address)
29{
30 pte_t *pte;
31 unsigned long *kaddr, i;
32
33 pte = (pte_t *) __get_free_pages(GFP_KERNEL | __GFP_RETRY_MAYFAIL,
34 PTE_ORDER);
35 kaddr = (unsigned long *)pte;
36 if (address & 0x80000000)
37 for (i = 0; i < (PAGE_SIZE/4); i++)
38 *(kaddr + i) = 0x1;
39 else
40 clear_page(kaddr);
41
42 return pte;
43}
44
45static inline struct page *pte_alloc_one(struct mm_struct *mm,
46 unsigned long address)
47{
48 struct page *pte;
49 unsigned long *kaddr, i;
50
51 pte = alloc_pages(GFP_KERNEL | __GFP_RETRY_MAYFAIL, PTE_ORDER);
52 if (pte) {
53 kaddr = kmap_atomic(pte);
54 if (address & 0x80000000) {
55 for (i = 0; i < (PAGE_SIZE/4); i++)
56 *(kaddr + i) = 0x1;
57 } else
58 clear_page(kaddr);
59 kunmap_atomic(kaddr);
60 pgtable_page_ctor(pte);
61 }
62 return pte;
63}
64
65static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
66{
67 free_pages((unsigned long)pte, PTE_ORDER);
68}
69
70static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
71{
72 pgtable_page_dtor(pte);
73 __free_pages(pte, PTE_ORDER);
74}
75
76static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
77{
78 free_pages((unsigned long)pgd, PGD_ORDER);
79}
80
81static inline pgd_t *pgd_alloc(struct mm_struct *mm)
82{
83 pgd_t *ret;
84 pgd_t *init;
85
86 ret = (pgd_t *) __get_free_pages(GFP_KERNEL, PGD_ORDER);
87 if (ret) {
88 init = pgd_offset(&init_mm, 0UL);
89 pgd_init((unsigned long *)ret);
90 memcpy(ret + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD,
91 (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
92 /* prevent out of order excute */
93 smp_mb();
94#ifdef CONFIG_CPU_NEED_TLBSYNC
95 dcache_wb_range((unsigned int)ret,
96 (unsigned int)(ret + PTRS_PER_PGD));
97#endif
98 }
99
100 return ret;
101}
102
103#define __pte_free_tlb(tlb, pte, address) \
104do { \
105 pgtable_page_dtor(pte); \
106 tlb_remove_page(tlb, pte); \
107} while (0)
108
109#define check_pgt_cache() do {} while (0)
110
111extern void pagetable_init(void);
112extern void pre_mmu_init(void);
113extern void pre_trap_init(void);
114
115#endif /* __ASM_CSKY_PGALLOC_H */