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 #include <asm-generic/pgalloc.h>
15
16 /* Allocate the top level pgd (page directory) */
pgd_alloc(struct mm_struct * mm)17 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
18 {
19 return __pgd_alloc(mm, PGD_TABLE_ORDER);
20 }
21
22 #if CONFIG_PGTABLE_LEVELS == 3
23
24 /* Three Level Page Table Support for pmd's */
25
pud_populate(struct mm_struct * mm,pud_t * pud,pmd_t * pmd)26 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
27 {
28 set_pud(pud, __pud((PxD_FLAG_PRESENT | PxD_FLAG_VALID) +
29 (__u32)(__pa((unsigned long)pmd) >> PxD_VALUE_SHIFT)));
30 }
31
pmd_alloc_one(struct mm_struct * mm,unsigned long address)32 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
33 {
34 struct ptdesc *ptdesc;
35 gfp_t gfp = GFP_PGTABLE_USER;
36
37 if (mm == &init_mm)
38 gfp = GFP_PGTABLE_KERNEL;
39 ptdesc = pagetable_alloc(gfp, PMD_TABLE_ORDER);
40 if (!ptdesc)
41 return NULL;
42 if (!pagetable_pmd_ctor(ptdesc)) {
43 pagetable_free(ptdesc);
44 return NULL;
45 }
46 return ptdesc_address(ptdesc);
47 }
48 #endif
49
50 static inline void
pmd_populate_kernel(struct mm_struct * mm,pmd_t * pmd,pte_t * pte)51 pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
52 {
53 set_pmd(pmd, __pmd((PxD_FLAG_PRESENT | PxD_FLAG_VALID)
54 + (__u32)(__pa((unsigned long)pte) >> PxD_VALUE_SHIFT)));
55 }
56
57 #define pmd_populate(mm, pmd, pte_page) \
58 pmd_populate_kernel(mm, pmd, page_address(pte_page))
59
60 #endif
61