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>
13
pmd_populate_kernel(struct mm_struct * mm,pmd_t * pmd,pte_t * pte)14 static 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
pmd_populate(struct mm_struct * mm,pmd_t * pmd,pgtable_t pte)20 static 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
28 extern void pgd_init(unsigned long *p);
29
pte_alloc_one_kernel(struct mm_struct * mm)30 static 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
pgd_alloc(struct mm_struct * mm)45 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
46 {
47 pgd_t *ret;
48 pgd_t *init;
49
50 ret = (pgd_t *) __get_free_pages(GFP_KERNEL, PGD_ORDER);
51 if (ret) {
52 init = pgd_offset(&init_mm, 0UL);
53 pgd_init((unsigned long *)ret);
54 memcpy(ret + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD,
55 (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
56 /* prevent out of order excute */
57 smp_mb();
58 #ifdef CONFIG_CPU_NEED_TLBSYNC
59 dcache_wb_range((unsigned int)ret,
60 (unsigned int)(ret + PTRS_PER_PGD));
61 #endif
62 }
63
64 return ret;
65 }
66
67 #define __pte_free_tlb(tlb, pte, address) \
68 do { \
69 pgtable_pte_page_dtor(pte); \
70 tlb_remove_page(tlb, pte); \
71 } while (0)
72
73 extern void pagetable_init(void);
74 extern void pre_mmu_init(void);
75 extern void pre_trap_init(void);
76
77 #endif /* __ASM_CSKY_PGALLOC_H */
78