1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_PGALLOC_H
3 #define _ASM_PGALLOC_H
4
5 #include <linux/gfp.h>
6 #include <linux/mm.h>
7 #include <linux/threads.h>
8 #include <asm/processor.h>
9 #include <asm/fixmap.h>
10
11 #include <asm/cache.h>
12
13 #define __HAVE_ARCH_PMD_ALLOC_ONE
14 #define __HAVE_ARCH_PMD_FREE
15 #define __HAVE_ARCH_PGD_FREE
16 #include <asm-generic/pgalloc.h>
17
18 /* Allocate the top level pgd (page directory) */
19 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
20 {
21 pgd_t *pgd;
22
23 pgd = (pgd_t *) __get_free_pages(GFP_KERNEL, PGD_TABLE_ORDER);
24 if (unlikely(pgd == NULL))
25 return NULL;
26
27 memset(pgd, 0, PAGE_SIZE << PGD_TABLE_ORDER);
28
29 return pgd;
30 }
31
32 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
33 {
34 free_pages((unsigned long)pgd, PGD_TABLE_ORDER);
35 }
36
37 #if CONFIG_PGTABLE_LEVELS == 3
38
39 /* Three Level Page Table Support for pmd's */
40
41 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
42 {
43 set_pud(pud, __pud((PxD_FLAG_PRESENT | PxD_FLAG_VALID) +
44 (__u32)(__pa((unsigned long)pmd) >> PxD_VALUE_SHIFT)));
45 }
46
47 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
48 {
49 pmd_t *pmd;
50
51 pmd = (pmd_t *)__get_free_pages(GFP_PGTABLE_KERNEL, PMD_TABLE_ORDER);
52 if (likely(pmd))
53 memset ((void *)pmd, 0, PAGE_SIZE << PMD_TABLE_ORDER);
54 return pmd;
55 }
56
57 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
58 {
59 free_pages((unsigned long)pmd, PMD_TABLE_ORDER);
60 }
61 #endif
62
63 static inline void
64 pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
65 {
66 set_pmd(pmd, __pmd((PxD_FLAG_PRESENT | PxD_FLAG_VALID)
67 + (__u32)(__pa((unsigned long)pte) >> PxD_VALUE_SHIFT)));
68 }
69
70 #define pmd_populate(mm, pmd, pte_page) \
71 pmd_populate_kernel(mm, pmd, page_address(pte_page))
72
73 #endif
74
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