From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- arch/s390/include/asm/hugetlb.h | 115 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 115 insertions(+) create mode 100644 arch/s390/include/asm/hugetlb.h (limited to 'arch/s390/include/asm/hugetlb.h') diff --git a/arch/s390/include/asm/hugetlb.h b/arch/s390/include/asm/hugetlb.h new file mode 100644 index 000000000..11eae5f55 --- /dev/null +++ b/arch/s390/include/asm/hugetlb.h @@ -0,0 +1,115 @@ +/* + * IBM System z Huge TLB Page Support for Kernel. + * + * Copyright IBM Corp. 2008 + * Author(s): Gerald Schaefer + */ + +#ifndef _ASM_S390_HUGETLB_H +#define _ASM_S390_HUGETLB_H + +#include +#include + + +#define is_hugepage_only_range(mm, addr, len) 0 +#define hugetlb_free_pgd_range free_pgd_range + +void set_huge_pte_at(struct mm_struct *mm, unsigned long addr, + pte_t *ptep, pte_t pte); +pte_t huge_ptep_get(pte_t *ptep); +pte_t huge_ptep_get_and_clear(struct mm_struct *mm, + unsigned long addr, pte_t *ptep); + +/* + * If the arch doesn't supply something else, assume that hugepage + * size aligned regions are ok without further preparation. + */ +static inline int prepare_hugepage_range(struct file *file, + unsigned long addr, unsigned long len) +{ + if (len & ~HPAGE_MASK) + return -EINVAL; + if (addr & ~HPAGE_MASK) + return -EINVAL; + return 0; +} + +#define hugetlb_prefault_arch_hook(mm) do { } while (0) +#define arch_clear_hugepage_flags(page) do { } while (0) + +int arch_prepare_hugepage(struct page *page); +void arch_release_hugepage(struct page *page); + +static inline void huge_pte_clear(struct mm_struct *mm, unsigned long addr, + pte_t *ptep) +{ + pte_val(*ptep) = _SEGMENT_ENTRY_EMPTY; +} + +static inline void huge_ptep_clear_flush(struct vm_area_struct *vma, + unsigned long address, pte_t *ptep) +{ + huge_ptep_get_and_clear(vma->vm_mm, address, ptep); +} + +static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma, + unsigned long addr, pte_t *ptep, + pte_t pte, int dirty) +{ + int changed = !pte_same(huge_ptep_get(ptep), pte); + if (changed) { + huge_ptep_get_and_clear(vma->vm_mm, addr, ptep); + set_huge_pte_at(vma->vm_mm, addr, ptep, pte); + } + return changed; +} + +static inline void huge_ptep_set_wrprotect(struct mm_struct *mm, + unsigned long addr, pte_t *ptep) +{ + pte_t pte = huge_ptep_get_and_clear(mm, addr, ptep); + set_huge_pte_at(mm, addr, ptep, pte_wrprotect(pte)); +} + +static inline pte_t mk_huge_pte(struct page *page, pgprot_t pgprot) +{ + return mk_pte(page, pgprot); +} + +static inline int huge_pte_none(pte_t pte) +{ + return pte_none(pte); +} + +static inline int huge_pte_write(pte_t pte) +{ + return pte_write(pte); +} + +static inline int huge_pte_dirty(pte_t pte) +{ + return pte_dirty(pte); +} + +static inline pte_t huge_pte_mkwrite(pte_t pte) +{ + return pte_mkwrite(pte); +} + +static inline pte_t huge_pte_mkdirty(pte_t pte) +{ + return pte_mkdirty(pte); +} + +static inline pte_t huge_pte_wrprotect(pte_t pte) +{ + return pte_wrprotect(pte); +} + +static inline pte_t huge_pte_modify(pte_t pte, pgprot_t newprot) +{ + return pte_modify(pte, newprot); +} + +#endif /* _ASM_S390_HUGETLB_H */ -- cgit v1.2.3-54-g00ecf