arch/arm64/include/asm/pgtable-types.h

Source file repositories/reference/linux-study-clean/arch/arm64/include/asm/pgtable-types.h

File Facts

System
Linux kernel
Corpus path
arch/arm64/include/asm/pgtable-types.h
Extension
.h
Size
1625 bytes
Lines
70
Domain
Architecture Layer
Bucket
arch/arm64
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_TYPES_H
#define __ASM_PGTABLE_TYPES_H

#include <asm/types.h>

/*
 * Page Table Descriptor
 *
 * Generic page table descriptor format from which
 * all level specific descriptors can be derived.
 */
typedef u64 ptval_t;

typedef ptval_t pteval_t;
typedef ptval_t pmdval_t;
typedef ptval_t pudval_t;
typedef ptval_t p4dval_t;
typedef ptval_t pgdval_t;

/*
 * These are used to make use of C type-checking..
 */
typedef struct { pteval_t pte; } pte_t;
#define pte_val(x)	((x).pte)
#define __pte(x)	((pte_t) { (x) } )

#if CONFIG_PGTABLE_LEVELS > 2
typedef struct { pmdval_t pmd; } pmd_t;
#define pmd_val(x)	((x).pmd)
#define __pmd(x)	((pmd_t) { (x) } )
#endif

#if CONFIG_PGTABLE_LEVELS > 3
typedef struct { pudval_t pud; } pud_t;
#define pud_val(x)	((x).pud)
#define __pud(x)	((pud_t) { (x) } )
#endif

#if CONFIG_PGTABLE_LEVELS > 4
typedef struct { p4dval_t p4d; } p4d_t;
#define p4d_val(x)	((x).p4d)
#define __p4d(x)	((p4d_t) { (x) } )
#endif

typedef struct { pgdval_t pgd; } pgd_t;
#define pgd_val(x)	((x).pgd)
#define __pgd(x)	((pgd_t) { (x) } )

typedef struct { ptval_t pgprot; } pgprot_t;
#define pgprot_val(x)	((x).pgprot)
#define __pgprot(x)	((pgprot_t) { (x) } )

#if CONFIG_PGTABLE_LEVELS == 2
#include <asm-generic/pgtable-nopmd.h>
#elif CONFIG_PGTABLE_LEVELS == 3
#include <asm-generic/pgtable-nopud.h>
#elif CONFIG_PGTABLE_LEVELS == 4
#include <asm-generic/pgtable-nop4d.h>
#endif

#endif	/* __ASM_PGTABLE_TYPES_H */

Annotation

Implementation Notes