1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_POWERPC_BOOK3S_32_PGALLOC_H
3 #define _ASM_POWERPC_BOOK3S_32_PGALLOC_H
4 
5 #include <linux/threads.h>
6 #include <linux/slab.h>
7 
8 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
9 {
10 	return kmem_cache_alloc(PGT_CACHE(PGD_INDEX_SIZE),
11 			pgtable_gfp_flags(mm, GFP_KERNEL));
12 }
13 
14 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
15 {
16 	kmem_cache_free(PGT_CACHE(PGD_INDEX_SIZE), pgd);
17 }
18 
19 /*
20  * We don't have any real pmd's, and this code never triggers because
21  * the pgd will always be present..
22  */
23 /* #define pmd_alloc_one(mm,address)       ({ BUG(); ((pmd_t *)2); }) */
24 #define pmd_free(mm, x) 		do { } while (0)
25 #define __pmd_free_tlb(tlb,x,a)		do { } while (0)
26 /* #define pgd_populate(mm, pmd, pte)      BUG() */
27 
28 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp,
29 				       pte_t *pte)
30 {
31 	*pmdp = __pmd(__pa(pte) | _PMD_PRESENT);
32 }
33 
34 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmdp,
35 				pgtable_t pte_page)
36 {
37 	*pmdp = __pmd(__pa(pte_page) | _PMD_PRESENT);
38 }
39 
40 static inline void pgtable_free(void *table, unsigned index_size)
41 {
42 	if (!index_size) {
43 		pte_fragment_free((unsigned long *)table, 0);
44 	} else {
45 		BUG_ON(index_size > MAX_PGTABLE_INDEX_SIZE);
46 		kmem_cache_free(PGT_CACHE(index_size), table);
47 	}
48 }
49 
50 #define get_hugepd_cache_index(x)  (x)
51 
52 static inline void pgtable_free_tlb(struct mmu_gather *tlb,
53 				    void *table, int shift)
54 {
55 	unsigned long pgf = (unsigned long)table;
56 	BUG_ON(shift > MAX_PGTABLE_INDEX_SIZE);
57 	pgf |= shift;
58 	tlb_remove_table(tlb, (void *)pgf);
59 }
60 
61 static inline void __tlb_remove_table(void *_table)
62 {
63 	void *table = (void *)((unsigned long)_table & ~MAX_PGTABLE_INDEX_SIZE);
64 	unsigned shift = (unsigned long)_table & MAX_PGTABLE_INDEX_SIZE;
65 
66 	pgtable_free(table, shift);
67 }
68 
69 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table,
70 				  unsigned long address)
71 {
72 	pgtable_free_tlb(tlb, table, 0);
73 }
74 #endif /* _ASM_POWERPC_BOOK3S_32_PGALLOC_H */
75