arch/alpha/include/asm/page.h

Source file repositories/reference/linux-study-clean/arch/alpha/include/asm/page.h

File Facts

System
Linux kernel
Corpus path
arch/alpha/include/asm/page.h
Extension
.h
Size
2070 bytes
Lines
88
Domain
Architecture Layer
Bucket
arch/alpha
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 _ALPHA_PAGE_H
#define _ALPHA_PAGE_H

#include <linux/const.h>
#include <asm/pal.h>
#include <vdso/page.h>

#ifndef __ASSEMBLER__

#define STRICT_MM_TYPECHECKS

extern void clear_page(void *page);

#define vma_alloc_zeroed_movable_folio(vma, vaddr) \
	vma_alloc_folio(GFP_HIGHUSER_MOVABLE | __GFP_ZERO, 0, vma, vaddr)

extern void copy_page(void * _to, void * _from);
#define copy_user_page(to, from, vaddr, pg)	copy_page(to, from)

#ifdef STRICT_MM_TYPECHECKS
/*
 * These are used to make use of C type-checking..
 */
typedef struct { unsigned long pte; } pte_t;
typedef struct { unsigned long pmd; } pmd_t;
typedef struct { unsigned long pgd; } pgd_t;
typedef struct { unsigned long pgprot; } pgprot_t;

#define pte_val(x)	((x).pte)
#define pmd_val(x)	((x).pmd)
#define pgd_val(x)	((x).pgd)
#define pgprot_val(x)	((x).pgprot)

#define __pte(x)	((pte_t) { (x) } )
#define __pmd(x)	((pmd_t) { (x) } )
#define __pgd(x)	((pgd_t) { (x) } )
#define __pgprot(x)	((pgprot_t) { (x) } )

#else
/*
 * .. while these make it easier on the compiler
 */
typedef unsigned long pte_t;
typedef unsigned long pmd_t;
typedef unsigned long pgd_t;
typedef unsigned long pgprot_t;

#define pte_val(x)	(x)
#define pmd_val(x)	(x)
#define pgd_val(x)	(x)
#define pgprot_val(x)	(x)

#define __pte(x)	(x)
#define __pgd(x)	(x)
#define __pgprot(x)	(x)

#endif /* STRICT_MM_TYPECHECKS */

typedef struct page *pgtable_t;

#ifdef USE_48_BIT_KSEG
#define PAGE_OFFSET		0xffff800000000000UL
#else
#define PAGE_OFFSET		0xfffffc0000000000UL
#endif

#else

#ifdef USE_48_BIT_KSEG
#define PAGE_OFFSET		0xffff800000000000
#else
#define PAGE_OFFSET		0xfffffc0000000000
#endif

#endif /* !__ASSEMBLER__ */

#define __pa(x)			((unsigned long) (x) - PAGE_OFFSET)
#define __va(x)			((void *)((unsigned long) (x) + PAGE_OFFSET))

#define virt_to_page(kaddr)	pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
#define virt_addr_valid(kaddr)	pfn_valid((__pa(kaddr) >> PAGE_SHIFT))

#include <asm-generic/memory_model.h>
#include <asm-generic/getorder.h>

#endif /* _ALPHA_PAGE_H */

Annotation

Implementation Notes