pgalloc.h

 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
 8static inline pgd_t *pgd_alloc(struct mm_struct *mm)
 9{
10	pgd_t *pgd = kmem_cache_alloc(PGT_CACHE(PGD_INDEX_SIZE),
11				      pgtable_gfp_flags(mm, GFP_KERNEL));
12
13#ifdef CONFIG_PPC_BOOK3S_603
14	memcpy(pgd + USER_PTRS_PER_PGD, swapper_pg_dir + USER_PTRS_PER_PGD,
15	       (MAX_PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
16#endif
17	return pgd;
18}
19
20static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
21{
22	kmem_cache_free(PGT_CACHE(PGD_INDEX_SIZE), pgd);
23}
24
25/*
26 * We don't have any real pmd's, and this code never triggers because
27 * the pgd will always be present..
28 */
29/* #define pmd_alloc_one(mm,address)       ({ BUG(); ((pmd_t *)2); }) */
30#define pmd_free(mm, x) 		do { } while (0)
31#define __pmd_free_tlb(tlb,x,a)		do { } while (0)
32/* #define pgd_populate(mm, pmd, pte)      BUG() */
33
34static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp,
35				       pte_t *pte)
36{
37	*pmdp = __pmd(__pa(pte) | _PMD_PRESENT);
38}
39
40static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmdp,
41				pgtable_t pte_page)
42{
43	*pmdp = __pmd(__pa(pte_page) | _PMD_PRESENT);
44}
45
46static inline void pgtable_free(void *table, unsigned index_size)
47{
48	if (!index_size) {
49		pte_fragment_free((unsigned long *)table, 0);
50	} else {
51		BUG_ON(index_size > MAX_PGTABLE_INDEX_SIZE);
52		kmem_cache_free(PGT_CACHE(index_size), table);
53	}
54}
55
56static inline void pgtable_free_tlb(struct mmu_gather *tlb,
57				    void *table, int shift)
58{
59	unsigned long pgf = (unsigned long)table;
60	BUG_ON(shift > MAX_PGTABLE_INDEX_SIZE);
61	pgf |= shift;
62	tlb_remove_table(tlb, (void *)pgf);
63}
64
65static inline void __tlb_remove_table(void *_table)
66{
67	void *table = (void *)((unsigned long)_table & ~MAX_PGTABLE_INDEX_SIZE);
68	unsigned shift = (unsigned long)_table & MAX_PGTABLE_INDEX_SIZE;
69
70	pgtable_free(table, shift);
71}
72
73static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table,
74				  unsigned long address)
75{
76	pgtable_free_tlb(tlb, table, 0);
77}
78#endif /* _ASM_POWERPC_BOOK3S_32_PGALLOC_H */