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/config.h>
17 #include <linux/threads.h>
18 #include <linux/gfp.h>
21 #define arch_add_exec_range(mm, limit) do { ; } while (0)
22 #define arch_flush_exec_range(mm) do { ; } while (0)
23 #define arch_remove_exec_range(mm, limit) do { ; } while (0)
25 #define check_pgt_cache() do {} while (0)
27 extern void diag10(unsigned long addr);
30 * Allocate and free page tables. The xxx_kernel() versions are
31 * used to allocate a kernel page table - this turns on ASN bits
35 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
41 pgd = (pgd_t *) __get_free_pages(GFP_KERNEL,1);
43 for (i = 0; i < USER_PTRS_PER_PGD; i++)
44 pmd_clear(pmd_offset(pgd + i, i*PGDIR_SIZE));
46 pgd = (pgd_t *) __get_free_pages(GFP_KERNEL,2);
48 for (i = 0; i < PTRS_PER_PGD; i++)
50 #endif /* __s390x__ */
54 static inline void pgd_free(pgd_t *pgd)
57 free_pages((unsigned long) pgd, 1);
59 free_pages((unsigned long) pgd, 2);
60 #endif /* __s390x__ */
65 * page middle directory allocation/free routines.
66 * We use pmd cache only on s390x, so these are dummy routines. This
67 * code never triggers because the pgd will always be present.
69 #define pmd_alloc_one(mm,address) ({ BUG(); ((pmd_t *)2); })
70 #define pmd_free(x) do { } while (0)
71 #define __pmd_free_tlb(tlb,x) do { } while (0)
72 #define pgd_populate(mm, pmd, pte) BUG()
74 static inline pmd_t * pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
79 pmd = (pmd_t *) __get_free_pages(GFP_KERNEL, 2);
81 for (i=0; i < PTRS_PER_PMD; i++)
87 static inline void pmd_free (pmd_t *pmd)
89 free_pages((unsigned long) pmd, 2);
92 #define __pmd_free_tlb(tlb,pmd) \
94 tlb_flush_mmu(tlb, 0, 0); \
98 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pmd_t *pmd)
100 pgd_val(*pgd) = _PGD_ENTRY | __pa(pmd);
103 #endif /* __s390x__ */
106 pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
109 pmd_val(pmd[0]) = _PAGE_TABLE + __pa(pte);
110 pmd_val(pmd[1]) = _PAGE_TABLE + __pa(pte+256);
111 pmd_val(pmd[2]) = _PAGE_TABLE + __pa(pte+512);
112 pmd_val(pmd[3]) = _PAGE_TABLE + __pa(pte+768);
113 #else /* __s390x__ */
114 pmd_val(*pmd) = _PMD_ENTRY + __pa(pte);
115 pmd_val1(*pmd) = _PMD_ENTRY + __pa(pte+256);
116 #endif /* __s390x__ */
120 pmd_populate(struct mm_struct *mm, pmd_t *pmd, struct page *page)
122 pmd_populate_kernel(mm, pmd, (pte_t *)((page-mem_map) << PAGE_SHIFT));
126 * page table entry allocation/free routines.
128 static inline pte_t *
129 pte_alloc_one_kernel(struct mm_struct *mm, unsigned long vmaddr)
134 pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT);
136 for (i=0; i < PTRS_PER_PTE; i++) {
137 pte_clear(mm, vmaddr, pte+i);
144 static inline struct page *
145 pte_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
147 pte_t *pte = pte_alloc_one_kernel(mm, vmaddr);
149 return virt_to_page(pte);
153 static inline void pte_free_kernel(pte_t *pte)
155 free_page((unsigned long) pte);
158 static inline void pte_free(struct page *pte)
163 #define __pte_free_tlb(tlb,pte) tlb_remove_page(tlb,pte)
165 #endif /* _S390_PGALLOC_H */