1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* sun3_pgalloc.h --
3  * reorganization around 2.3.39, routines moved from sun3_pgtable.h
4  *
5  *
6  * 02/27/2002 -- Modified to support "highpte" implementation in 2.5.5 (Sam)
7  *
8  * moved 1/26/2000 Sam Creasey
9  */
10 
11 #ifndef _SUN3_PGALLOC_H
12 #define _SUN3_PGALLOC_H
13 
14 #include <asm/tlb.h>
15 
16 #include <asm-generic/pgalloc.h>	/* for pte_{alloc,free}_one */
17 
18 extern const char bad_pmd_string[];
19 
20 #define __pte_free_tlb(tlb,pte,addr)			\
21 do {							\
22 	pgtable_pte_page_dtor(pte);			\
23 	tlb_remove_page((tlb), pte);			\
24 } while (0)
25 
26 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
27 {
28 	pmd_val(*pmd) = __pa((unsigned long)pte);
29 }
30 
31 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, pgtable_t page)
32 {
33 	pmd_val(*pmd) = __pa((unsigned long)page_address(page));
34 }
35 #define pmd_pgtable(pmd) pmd_page(pmd)
36 
37 /*
38  * allocating and freeing a pmd is trivial: the 1-entry pmd is
39  * inside the pgd, so has no extra memory associated with it.
40  */
41 #define pmd_free(mm, x)			do { } while (0)
42 
43 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
44 {
45         free_page((unsigned long) pgd);
46 }
47 
48 static inline pgd_t * pgd_alloc(struct mm_struct *mm)
49 {
50      pgd_t *new_pgd;
51 
52      new_pgd = (pgd_t *)get_zeroed_page(GFP_KERNEL);
53      memcpy(new_pgd, swapper_pg_dir, PAGE_SIZE);
54      memset(new_pgd, 0, (PAGE_OFFSET >> PGDIR_SHIFT));
55      return new_pgd;
56 }
57 
58 #endif /* SUN3_PGALLOC_H */
59