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 <asm/processor.h>
18 #include <linux/threads.h>
19 #include <linux/gfp.h>
22 #define arch_add_exec_range(mm, limit) do { ; } while (0)
23 #define arch_flush_exec_range(mm) do { ; } while (0)
24 #define arch_remove_exec_range(mm, limit) do { ; } while (0)
26 #define check_pgt_cache() do {} while (0)
28 extern void diag10(unsigned long addr);
31 * Allocate and free page tables. The xxx_kernel() versions are
32 * used to allocate a kernel page table - this turns on ASN bits
36 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
42 pgd = (pgd_t *) __get_free_pages(GFP_KERNEL,1);
44 for (i = 0; i < USER_PTRS_PER_PGD; i++)
45 pmd_clear(pmd_offset(pgd + i, i*PGDIR_SIZE));
47 pgd = (pgd_t *) __get_free_pages(GFP_KERNEL,2);
49 for (i = 0; i < PTRS_PER_PGD; i++)
51 #endif /* __s390x__ */
55 static inline void pgd_free(pgd_t *pgd)
58 free_pages((unsigned long) pgd, 1);
60 free_pages((unsigned long) pgd, 2);
61 #endif /* __s390x__ */
66 * page middle directory allocation/free routines.
67 * We use pmd cache only on s390x, so these are dummy routines. This
68 * code never triggers because the pgd will always be present.
70 #define pmd_alloc_one(mm,address) ({ BUG(); ((pmd_t *)2); })
71 #define pmd_free(x) do { } while (0)
72 #define __pmd_free_tlb(tlb,x) do { } while (0)
73 #define pgd_populate(mm, pmd, pte) BUG()
75 static inline pmd_t * pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
80 pmd = (pmd_t *) __get_free_pages(GFP_KERNEL, 2);
82 for (i=0; i < PTRS_PER_PMD; i++)
88 static inline void pmd_free (pmd_t *pmd)
90 free_pages((unsigned long) pmd, 2);
93 #define __pmd_free_tlb(tlb,pmd) \
95 tlb_flush_mmu(tlb, 0, 0); \
99 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pmd_t *pmd)
101 pgd_val(*pgd) = _PGD_ENTRY | __pa(pmd);
104 #endif /* __s390x__ */
107 pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
110 pmd_val(pmd[0]) = _PAGE_TABLE + __pa(pte);
111 pmd_val(pmd[1]) = _PAGE_TABLE + __pa(pte+256);
112 pmd_val(pmd[2]) = _PAGE_TABLE + __pa(pte+512);
113 pmd_val(pmd[3]) = _PAGE_TABLE + __pa(pte+768);
114 #else /* __s390x__ */
115 pmd_val(*pmd) = _PMD_ENTRY + __pa(pte);
116 pmd_val1(*pmd) = _PMD_ENTRY + __pa(pte+256);
117 #endif /* __s390x__ */
121 pmd_populate(struct mm_struct *mm, pmd_t *pmd, struct page *page)
123 pmd_populate_kernel(mm, pmd, (pte_t *)((page-mem_map) << PAGE_SHIFT));
127 * page table entry allocation/free routines.
129 static inline pte_t *
130 pte_alloc_one_kernel(struct mm_struct *mm, unsigned long vmaddr)
135 pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT);
137 for (i=0; i < PTRS_PER_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)
165 * This establishes kernel virtual mappings (e.g., as a result of a
166 * vmalloc call). Since s390-esame uses a separate kernel page table,
167 * there is nothing to do here... :)
169 #define set_pgdir(addr,entry) do { } while(0)
171 #endif /* _S390_PGALLOC_H */