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Diffstat (limited to 'include/asm-s390/pgalloc.h')
| -rw-r--r-- | include/asm-s390/pgalloc.h | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/include/asm-s390/pgalloc.h b/include/asm-s390/pgalloc.h new file mode 100644 index 00000000000..3417dd71ab4 --- /dev/null +++ b/include/asm-s390/pgalloc.h @@ -0,0 +1,168 @@ +/* + * include/asm-s390/pgalloc.h + * + * S390 version + * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation + * Author(s): Hartmut Penner (hp@de.ibm.com) + * Martin Schwidefsky (schwidefsky@de.ibm.com) + * + * Derived from "include/asm-i386/pgalloc.h" + * Copyright (C) 1994 Linus Torvalds + */ + +#ifndef _S390_PGALLOC_H +#define _S390_PGALLOC_H + +#include <linux/config.h> +#include <linux/threads.h> +#include <linux/gfp.h> +#include <linux/mm.h> + +#define check_pgt_cache() do {} while (0) + +extern void diag10(unsigned long addr); + +/* + * Allocate and free page tables. The xxx_kernel() versions are + * used to allocate a kernel page table - this turns on ASN bits + * if any. + */ + +static inline pgd_t *pgd_alloc(struct mm_struct *mm) +{ + pgd_t *pgd; + int i; + +#ifndef __s390x__ + pgd = (pgd_t *) __get_free_pages(GFP_KERNEL,1); + if (pgd != NULL) + for (i = 0; i < USER_PTRS_PER_PGD; i++) + pmd_clear(pmd_offset(pgd + i, i*PGDIR_SIZE)); +#else /* __s390x__ */ + pgd = (pgd_t *) __get_free_pages(GFP_KERNEL,2); + if (pgd != NULL) + for (i = 0; i < PTRS_PER_PGD; i++) + pgd_clear(pgd + i); +#endif /* __s390x__ */ + return pgd; +} + +static inline void pgd_free(pgd_t *pgd) +{ +#ifndef __s390x__ + free_pages((unsigned long) pgd, 1); +#else /* __s390x__ */ + free_pages((unsigned long) pgd, 2); +#endif /* __s390x__ */ +} + +#ifndef __s390x__ +/* + * page middle directory allocation/free routines. + * We use pmd cache only on s390x, so these are dummy routines. This + * code never triggers because the pgd will always be present. + */ +#define pmd_alloc_one(mm,address) ({ BUG(); ((pmd_t *)2); }) +#define pmd_free(x) do { } while (0) +#define __pmd_free_tlb(tlb,x) do { } while (0) +#define pgd_populate(mm, pmd, pte) BUG() +#else /* __s390x__ */ +static inline pmd_t * pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr) +{ + pmd_t *pmd; + int i; + + pmd = (pmd_t *) __get_free_pages(GFP_KERNEL, 2); + if (pmd != NULL) { + for (i=0; i < PTRS_PER_PMD; i++) + pmd_clear(pmd+i); + } + return pmd; +} + +static inline void pmd_free (pmd_t *pmd) +{ + free_pages((unsigned long) pmd, 2); +} + +#define __pmd_free_tlb(tlb,pmd) \ + do { \ + tlb_flush_mmu(tlb, 0, 0); \ + pmd_free(pmd); \ + } while (0) + +static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pmd_t *pmd) +{ + pgd_val(*pgd) = _PGD_ENTRY | __pa(pmd); +} + +#endif /* __s390x__ */ + +static inline void +pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte) +{ +#ifndef __s390x__ + pmd_val(pmd[0]) = _PAGE_TABLE + __pa(pte); + pmd_val(pmd[1]) = _PAGE_TABLE + __pa(pte+256); + pmd_val(pmd[2]) = _PAGE_TABLE + __pa(pte+512); + pmd_val(pmd[3]) = _PAGE_TABLE + __pa(pte+768); +#else /* __s390x__ */ + pmd_val(*pmd) = _PMD_ENTRY + __pa(pte); + pmd_val1(*pmd) = _PMD_ENTRY + __pa(pte+256); +#endif /* __s390x__ */ +} + +static inline void +pmd_populate(struct mm_struct *mm, pmd_t *pmd, struct page *page) +{ + pmd_populate_kernel(mm, pmd, (pte_t *)((page-mem_map) << PAGE_SHIFT)); +} + +/* + * page table entry allocation/free routines. + */ +static inline pte_t * +pte_alloc_one_kernel(struct mm_struct *mm, unsigned long vmaddr) +{ + pte_t *pte; + int i; + + pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT); + if (pte != NULL) { + for (i=0; i < PTRS_PER_PTE; i++) { + pte_clear(mm, vmaddr, pte+i); + vmaddr += PAGE_SIZE; + } + } + return pte; +} + +static inline struct page * +pte_alloc_one(struct mm_struct *mm, unsigned long vmaddr) +{ + pte_t *pte = pte_alloc_one_kernel(mm, vmaddr); + if (pte) + return virt_to_page(pte); + return 0; +} + +static inline void pte_free_kernel(pte_t *pte) +{ + free_page((unsigned long) pte); +} + +static inline void pte_free(struct page *pte) +{ + __free_page(pte); +} + +#define __pte_free_tlb(tlb,pte) tlb_remove_page(tlb,pte) + +/* + * This establishes kernel virtual mappings (e.g., as a result of a + * vmalloc call). Since s390-esame uses a separate kernel page table, + * there is nothing to do here... :) + */ +#define set_pgdir(addr,entry) do { } while(0) + +#endif /* _S390_PGALLOC_H */ |