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 * Allocate and free page tables. The xxx_kernel() versions are
30 * used to allocate a kernel page table - this turns on ASN bits
34 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
40 pgd = (pgd_t *) __get_free_pages(GFP_KERNEL,1);
42 for (i = 0; i < USER_PTRS_PER_PGD; i++)
43 pmd_clear(pmd_offset(pgd + i, i*PGDIR_SIZE));
45 pgd = (pgd_t *) __get_free_pages(GFP_KERNEL,2);
47 for (i = 0; i < PTRS_PER_PGD; i++)
49 #endif /* __s390x__ */
53 static inline void pgd_free(pgd_t *pgd)
56 free_pages((unsigned long) pgd, 1);
58 free_pages((unsigned long) pgd, 2);
59 #endif /* __s390x__ */
64 * page middle directory allocation/free routines.
65 * We use pmd cache only on s390x, so these are dummy routines. This
66 * code never triggers because the pgd will always be present.
68 #define pmd_alloc_one(mm,address) ({ BUG(); ((pmd_t *)2); })
69 #define pmd_free(x) do { } while (0)
70 #define __pmd_free_tlb(tlb,x) do { } while (0)
71 #define pgd_populate(mm, pmd, pte) BUG()
73 static inline pmd_t * pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
78 pmd = (pmd_t *) __get_free_pages(GFP_KERNEL, 2);
80 for (i=0; i < PTRS_PER_PMD; i++)
86 static inline void pmd_free (pmd_t *pmd)
88 free_pages((unsigned long) pmd, 2);
91 #define __pmd_free_tlb(tlb,pmd) \
93 tlb_flush_mmu(tlb, 0, 0); \
97 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pmd_t *pmd)
99 pgd_val(*pgd) = _PGD_ENTRY | __pa(pmd);
102 #endif /* __s390x__ */
105 pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
108 pmd_val(pmd[0]) = _PAGE_TABLE + __pa(pte);
109 pmd_val(pmd[1]) = _PAGE_TABLE + __pa(pte+256);
110 pmd_val(pmd[2]) = _PAGE_TABLE + __pa(pte+512);
111 pmd_val(pmd[3]) = _PAGE_TABLE + __pa(pte+768);
112 #else /* __s390x__ */
113 pmd_val(*pmd) = _PMD_ENTRY + __pa(pte);
114 pmd_val1(*pmd) = _PMD_ENTRY + __pa(pte+256);
115 #endif /* __s390x__ */
119 pmd_populate(struct mm_struct *mm, pmd_t *pmd, struct page *page)
121 pmd_populate_kernel(mm, pmd, (pte_t *)((page-mem_map) << PAGE_SHIFT));
125 * page table entry allocation/free routines.
127 static inline pte_t *
128 pte_alloc_one_kernel(struct mm_struct *mm, unsigned long vmaddr)
133 pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT);
135 for (i=0; i < PTRS_PER_PTE; i++) {
136 pte_clear(mm, vmaddr, pte+i);
143 static inline struct page *
144 pte_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
146 pte_t *pte = pte_alloc_one_kernel(mm, vmaddr);
148 return virt_to_page(pte);
152 static inline void pte_free_kernel(pte_t *pte)
154 free_page((unsigned long) pte);
157 static inline void pte_free(struct page *pte)
162 #define __pte_free_tlb(tlb,pte) tlb_remove_page(tlb,pte)
164 #endif /* _S390_PGALLOC_H */