2 * include/asm-s390/pgalloc.h
5 * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
6 * Author(s): Hartmut Penner (hp@de.ibm.com)
7 * Martin Schwidefsky (schwidefsky@de.ibm.com)
9 * Derived from "include/asm-i386/pgalloc.h"
10 * Copyright (C) 1994 Linus Torvalds
13 #ifndef _S390_PGALLOC_H
14 #define _S390_PGALLOC_H
16 #include <linux/threads.h>
17 #include <linux/gfp.h>
20 #define check_pgt_cache() do {} while (0)
22 extern void diag10(unsigned long addr);
25 * Allocate and free page tables. The xxx_kernel() versions are
26 * used to allocate a kernel page table - this turns on ASN bits
30 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
36 pgd = (pgd_t *) __get_free_pages(GFP_KERNEL,1);
38 for (i = 0; i < USER_PTRS_PER_PGD; i++)
39 pmd_clear(pmd_offset(pgd + i, i*PGDIR_SIZE));
41 pgd = (pgd_t *) __get_free_pages(GFP_KERNEL,2);
43 for (i = 0; i < PTRS_PER_PGD; i++)
45 #endif /* __s390x__ */
49 static inline void pgd_free(pgd_t *pgd)
52 free_pages((unsigned long) pgd, 1);
54 free_pages((unsigned long) pgd, 2);
55 #endif /* __s390x__ */
60 * page middle directory allocation/free routines.
61 * We use pmd cache only on s390x, so these are dummy routines. This
62 * code never triggers because the pgd will always be present.
64 #define pmd_alloc_one(mm,address) ({ BUG(); ((pmd_t *)2); })
65 #define pmd_free(x) do { } while (0)
66 #define __pmd_free_tlb(tlb,x) do { } while (0)
67 #define pgd_populate(mm, pmd, pte) BUG()
69 static inline pmd_t * pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
74 pmd = (pmd_t *) __get_free_pages(GFP_KERNEL, 2);
76 for (i=0; i < PTRS_PER_PMD; i++)
82 static inline void pmd_free (pmd_t *pmd)
84 free_pages((unsigned long) pmd, 2);
87 #define __pmd_free_tlb(tlb,pmd) \
89 tlb_flush_mmu(tlb, 0, 0); \
93 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pmd_t *pmd)
95 pgd_val(*pgd) = _PGD_ENTRY | __pa(pmd);
98 #endif /* __s390x__ */
101 pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
104 pmd_val(pmd[0]) = _PAGE_TABLE + __pa(pte);
105 pmd_val(pmd[1]) = _PAGE_TABLE + __pa(pte+256);
106 pmd_val(pmd[2]) = _PAGE_TABLE + __pa(pte+512);
107 pmd_val(pmd[3]) = _PAGE_TABLE + __pa(pte+768);
108 #else /* __s390x__ */
109 pmd_val(*pmd) = _PMD_ENTRY + __pa(pte);
110 pmd_val1(*pmd) = _PMD_ENTRY + __pa(pte+256);
111 #endif /* __s390x__ */
115 pmd_populate(struct mm_struct *mm, pmd_t *pmd, struct page *page)
117 pmd_populate_kernel(mm, pmd, (pte_t *)((page-mem_map) << PAGE_SHIFT));
121 * page table entry allocation/free routines.
123 static inline pte_t *
124 pte_alloc_one_kernel(struct mm_struct *mm, unsigned long vmaddr)
129 pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT);
131 for (i=0; i < PTRS_PER_PTE; i++) {
132 pte_clear(mm, vmaddr, pte+i);
139 static inline struct page *
140 pte_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
142 pte_t *pte = pte_alloc_one_kernel(mm, vmaddr);
144 return virt_to_page(pte);
148 static inline void pte_free_kernel(pte_t *pte)
150 free_page((unsigned long) pte);
153 static inline void pte_free(struct page *pte)
158 #define __pte_free_tlb(tlb,pte) tlb_remove_page(tlb,pte)
160 #endif /* _S390_PGALLOC_H */