arch/s390/include/asm/hugetlb.h

Source file repositories/reference/linux-study-clean/arch/s390/include/asm/hugetlb.h

File Facts

System
Linux kernel
Corpus path
arch/s390/include/asm/hugetlb.h
Extension
.h
Size
2745 bytes
Lines
101
Domain
Architecture Layer
Bucket
arch/s390
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

#ifndef _ASM_S390_HUGETLB_H
#define _ASM_S390_HUGETLB_H

#include <linux/cpufeature.h>
#include <linux/pgtable.h>
#include <linux/swap.h>
#include <linux/swapops.h>
#include <asm/page.h>

#define hugepages_supported()	cpu_has_edat1()

#define __HAVE_ARCH_HUGE_SET_HUGE_PTE_AT
void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
		     pte_t *ptep, pte_t pte, unsigned long sz);
void __set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
		       pte_t *ptep, pte_t pte);

#define __HAVE_ARCH_HUGE_PTEP_GET
pte_t huge_ptep_get(struct mm_struct *mm, unsigned long addr, pte_t *ptep);

pte_t __huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
				pte_t *ptep);

#define __HAVE_ARCH_HUGE_PTEP_GET_AND_CLEAR
static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
					    unsigned long addr, pte_t *ptep,
					    unsigned long sz)
{
	return __huge_ptep_get_and_clear(mm, addr, ptep);
}

#define __HAVE_ARCH_HUGE_PTE_CLEAR
static inline void huge_pte_clear(struct mm_struct *mm, unsigned long addr,
				  pte_t *ptep, unsigned long sz)
{
	if ((pte_val(ptep_get(ptep)) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3)
		set_pte(ptep, __pte(_REGION3_ENTRY_EMPTY));
	else
		set_pte(ptep, __pte(_SEGMENT_ENTRY_EMPTY));
}

#define __HAVE_ARCH_HUGE_PTEP_CLEAR_FLUSH
static inline pte_t huge_ptep_clear_flush(struct vm_area_struct *vma,
					  unsigned long address, pte_t *ptep)
{
	return __huge_ptep_get_and_clear(vma->vm_mm, address, ptep);
}

#define  __HAVE_ARCH_HUGE_PTEP_SET_ACCESS_FLAGS
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(vma->vm_mm, addr, 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;
}

#define __HAVE_ARCH_HUGE_PTEP_SET_WRPROTECT
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));
}

#define __HAVE_ARCH_HUGE_PTE_MKUFFD_WP
static inline pte_t huge_pte_mkuffd_wp(pte_t pte)
{
	return pte;
}

#define __HAVE_ARCH_HUGE_PTE_CLEAR_UFFD_WP
static inline pte_t huge_pte_clear_uffd_wp(pte_t pte)
{
	return pte;
}

#define __HAVE_ARCH_HUGE_PTE_UFFD_WP
static inline int huge_pte_uffd_wp(pte_t pte)
{
	return 0;
}

#include <asm-generic/hugetlb.h>

Annotation

Implementation Notes