arch/arm/include/asm/pgtable-3level-types.h

Source file repositories/reference/linux-study-clean/arch/arm/include/asm/pgtable-3level-types.h

File Facts

System
Linux kernel
Corpus path
arch/arm/include/asm/pgtable-3level-types.h
Extension
.h
Size
1331 bytes
Lines
59
Domain
Architecture Layer
Bucket
arch/arm
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_PGTABLE_3LEVEL_TYPES_H
#define _ASM_PGTABLE_3LEVEL_TYPES_H

#include <asm/types.h>

typedef u64 pteval_t;
typedef u64 pmdval_t;
typedef u64 pgdval_t;

#undef STRICT_MM_TYPECHECKS

#ifdef STRICT_MM_TYPECHECKS

/*
 * These are used to make use of C type-checking..
 */
typedef struct { pteval_t pte; } pte_t;
typedef struct { pmdval_t pmd; } pmd_t;
typedef struct { pgdval_t pgd; } pgd_t;
typedef struct { pteval_t 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	/* !STRICT_MM_TYPECHECKS */

typedef pteval_t pte_t;
typedef pmdval_t pmd_t;
typedef pgdval_t pgd_t;
typedef pteval_t 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 __pmd(x)	(x)
#define __pgd(x)	(x)
#define __pgprot(x)	(x)

#endif	/* STRICT_MM_TYPECHECKS */

#endif	/* _ASM_PGTABLE_3LEVEL_TYPES_H */

Annotation

Implementation Notes