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 * Page allocation orders.
28 # define PTE_ALLOC_ORDER 0
29 # define PMD_ALLOC_ORDER 0
30 # define PGD_ALLOC_ORDER 1
32 # define PTE_ALLOC_ORDER 0
33 # define PMD_ALLOC_ORDER 2
34 # define PGD_ALLOC_ORDER 2
35 #endif /* __s390x__ */
38 * Allocate and free page tables. The xxx_kernel() versions are
39 * used to allocate a kernel page table - this turns on ASN bits
43 static inline pgd_t
*pgd_alloc(struct mm_struct
*mm
)
45 pgd_t
*pgd
= (pgd_t
*) __get_free_pages(GFP_KERNEL
, PGD_ALLOC_ORDER
);
50 for (i
= 0; i
< PTRS_PER_PGD
; i
++)
52 pmd_clear(pmd_offset(pgd
+ i
, i
*PGDIR_SIZE
));
59 static inline void pgd_free(pgd_t
*pgd
)
61 free_pages((unsigned long) pgd
, PGD_ALLOC_ORDER
);
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
)
77 pmd_t
*pmd
= (pmd_t
*) __get_free_pages(GFP_KERNEL
, PMD_ALLOC_ORDER
);
82 for (i
=0; i
< PTRS_PER_PMD
; i
++)
87 static inline void pmd_free (pmd_t
*pmd
)
89 free_pages((unsigned long) pmd
, PMD_ALLOC_ORDER
);
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_to_phys(page
));
126 * page table entry allocation/free routines.
128 static inline pte_t
*
129 pte_alloc_one_kernel(struct mm_struct
*mm
, unsigned long vmaddr
)
131 pte_t
*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
);
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 */