Linux kernel mirror (for testing)
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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
11#define __HAVE_ARCH_PTE_ALLOC_ONE_KERNEL
12#include <asm-generic/pgalloc.h> /* for pte_{alloc,free}_one */
13
14static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
15 pte_t *pte)
16{
17 set_pmd(pmd, __pmd(__pa(pte)));
18}
19
20static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
21 pgtable_t pte)
22{
23 set_pmd(pmd, __pmd(__pa(page_address(pte))));
24}
25
26#define pmd_pgtable(pmd) pmd_page(pmd)
27
28extern void pgd_init(unsigned long *p);
29
30static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
31{
32 pte_t *pte;
33 unsigned long i;
34
35 pte = (pte_t *) __get_free_page(GFP_KERNEL);
36 if (!pte)
37 return NULL;
38
39 for (i = 0; i < PAGE_SIZE/sizeof(pte_t); i++)
40 (pte + i)->pte_low = _PAGE_GLOBAL;
41
42 return pte;
43}
44
45static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
46{
47 free_pages((unsigned long)pgd, PGD_ORDER);
48}
49
50static inline pgd_t *pgd_alloc(struct mm_struct *mm)
51{
52 pgd_t *ret;
53 pgd_t *init;
54
55 ret = (pgd_t *) __get_free_pages(GFP_KERNEL, PGD_ORDER);
56 if (ret) {
57 init = pgd_offset(&init_mm, 0UL);
58 pgd_init((unsigned long *)ret);
59 memcpy(ret + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD,
60 (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
61 /* prevent out of order excute */
62 smp_mb();
63#ifdef CONFIG_CPU_NEED_TLBSYNC
64 dcache_wb_range((unsigned int)ret,
65 (unsigned int)(ret + PTRS_PER_PGD));
66#endif
67 }
68
69 return ret;
70}
71
72#define __pte_free_tlb(tlb, pte, address) \
73do { \
74 pgtable_pte_page_dtor(pte); \
75 tlb_remove_page(tlb, pte); \
76} while (0)
77
78extern void pagetable_init(void);
79extern void pre_mmu_init(void);
80extern void pre_trap_init(void);
81
82#endif /* __ASM_CSKY_PGALLOC_H */