/* * 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 */