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 arch_add_exec_range(mm, limit) do { ; } while (0)
21 #define arch_flush_exec_range(mm) do { ; } while (0)
22 #define arch_remove_exec_range(mm, limit) do { ; } while (0)
24 #define check_pgt_cache() do {} while (0)
26 extern void diag10(unsigned long addr);
29 * Page allocation orders.
32 # define PTE_ALLOC_ORDER 0
33 # define PMD_ALLOC_ORDER 0
34 # define PGD_ALLOC_ORDER 1
36 # define PTE_ALLOC_ORDER 0
37 # define PMD_ALLOC_ORDER 2
38 # define PGD_ALLOC_ORDER 2
39 #endif /* __s390x__ */
42 * Allocate and free page tables. The xxx_kernel() versions are
43 * used to allocate a kernel page table - this turns on ASN bits
47 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
49 pgd_t *pgd = (pgd_t *) __get_free_pages(GFP_KERNEL, PGD_ALLOC_ORDER);
54 for (i = 0; i < PTRS_PER_PGD; i++)
56 pmd_clear(pmd_offset(pgd + i, i*PGDIR_SIZE));
63 static inline void pgd_free(pgd_t *pgd)
65 free_pages((unsigned long) pgd, PGD_ALLOC_ORDER);
70 * page middle directory allocation/free routines.
71 * We use pmd cache only on s390x, so these are dummy routines. This
72 * code never triggers because the pgd will always be present.
74 #define pmd_alloc_one(mm,address) ({ BUG(); ((pmd_t *)2); })
75 #define pmd_free(x) do { } while (0)
76 #define __pmd_free_tlb(tlb,x) do { } while (0)
77 #define pgd_populate(mm, pmd, pte) BUG()
79 static inline pmd_t * pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
81 pmd_t *pmd = (pmd_t *) __get_free_pages(GFP_KERNEL, PMD_ALLOC_ORDER);
86 for (i=0; i < PTRS_PER_PMD; i++)
91 static inline void pmd_free (pmd_t *pmd)
93 free_pages((unsigned long) pmd, PMD_ALLOC_ORDER);
96 #define __pmd_free_tlb(tlb,pmd) \
98 tlb_flush_mmu(tlb, 0, 0); \
102 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pmd_t *pmd)
104 pgd_val(*pgd) = _PGD_ENTRY | __pa(pmd);
107 #endif /* __s390x__ */
110 pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
113 pmd_val(pmd[0]) = _PAGE_TABLE + __pa(pte);
114 pmd_val(pmd[1]) = _PAGE_TABLE + __pa(pte+256);
115 pmd_val(pmd[2]) = _PAGE_TABLE + __pa(pte+512);
116 pmd_val(pmd[3]) = _PAGE_TABLE + __pa(pte+768);
117 #else /* __s390x__ */
118 pmd_val(*pmd) = _PMD_ENTRY + __pa(pte);
119 pmd_val1(*pmd) = _PMD_ENTRY + __pa(pte+256);
120 #endif /* __s390x__ */
124 pmd_populate(struct mm_struct *mm, pmd_t *pmd, struct page *page)
126 pmd_populate_kernel(mm, pmd, (pte_t *)page_to_phys(page));
130 * page table entry allocation/free routines.
132 static inline pte_t *
133 pte_alloc_one_kernel(struct mm_struct *mm, unsigned long vmaddr)
135 pte_t *pte = (pte_t *) __get_free_page(GFP_KERNEL|__GFP_REPEAT);
140 for (i=0; i < PTRS_PER_PTE; i++) {
141 pte_clear(mm, vmaddr, pte + i);
147 static inline struct page *
148 pte_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
150 pte_t *pte = pte_alloc_one_kernel(mm, vmaddr);
152 return virt_to_page(pte);
156 static inline void pte_free_kernel(pte_t *pte)
158 free_page((unsigned long) pte);
161 static inline void pte_free(struct page *pte)
166 #define __pte_free_tlb(tlb,pte) tlb_remove_page(tlb,pte)
168 #endif /* _S390_PGALLOC_H */