arch/arm/include/asm/pgtable-2level-hwdef.h

Source file repositories/reference/linux-study-clean/arch/arm/include/asm/pgtable-2level-hwdef.h

File Facts

System
Linux kernel
Corpus path
arch/arm/include/asm/pgtable-2level-hwdef.h
Extension
.h
Size
3385 bytes
Lines
95
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_2LEVEL_HWDEF_H
#define _ASM_PGTABLE_2LEVEL_HWDEF_H

/*
 * Hardware page table definitions.
 *
 * + Level 1 descriptor (PMD)
 *   - common
 */
#define PMD_TYPE_MASK		(_AT(pmdval_t, 3) << 0)
#define PMD_TYPE_FAULT		(_AT(pmdval_t, 0) << 0)
#define PMD_TYPE_TABLE		(_AT(pmdval_t, 1) << 0)
#define PMD_TYPE_SECT		(_AT(pmdval_t, 2) << 0)
#define PMD_PXNTABLE		(_AT(pmdval_t, 1) << 2)     /* v7 */
#define PMD_BIT4		(_AT(pmdval_t, 1) << 4)
#define PMD_DOMAIN(x)		(_AT(pmdval_t, (x)) << 5)
#define PMD_DOMAIN_MASK		PMD_DOMAIN(0x0f)
#define PMD_PROTECTION		(_AT(pmdval_t, 1) << 9)		/* v5 */
/*
 *   - section
 */
#define PMD_SECT_PXN    (_AT(pmdval_t, 1) << 0)     /* v7 */
#define PMD_SECT_BUFFERABLE	(_AT(pmdval_t, 1) << 2)
#define PMD_SECT_CACHEABLE	(_AT(pmdval_t, 1) << 3)
#define PMD_SECT_XN		(_AT(pmdval_t, 1) << 4)		/* v6 */
#define PMD_SECT_AP_WRITE	(_AT(pmdval_t, 1) << 10)
#define PMD_SECT_AP_READ	(_AT(pmdval_t, 1) << 11)
#define PMD_SECT_TEX(x)		(_AT(pmdval_t, (x)) << 12)	/* v5 */
#define PMD_SECT_APX		(_AT(pmdval_t, 1) << 15)	/* v6 */
#define PMD_SECT_S		(_AT(pmdval_t, 1) << 16)	/* v6 */
#define PMD_SECT_nG		(_AT(pmdval_t, 1) << 17)	/* v6 */
#define PMD_SECT_SUPER		(_AT(pmdval_t, 1) << 18)	/* v6 */
#define PMD_SECT_AF		(_AT(pmdval_t, 0))

#define PMD_SECT_UNCACHED	(_AT(pmdval_t, 0))
#define PMD_SECT_BUFFERED	(PMD_SECT_BUFFERABLE)
#define PMD_SECT_WT		(PMD_SECT_CACHEABLE)
#define PMD_SECT_WB		(PMD_SECT_CACHEABLE | PMD_SECT_BUFFERABLE)
#define PMD_SECT_MINICACHE	(PMD_SECT_TEX(1) | PMD_SECT_CACHEABLE)
#define PMD_SECT_WBWA		(PMD_SECT_TEX(1) | PMD_SECT_CACHEABLE | PMD_SECT_BUFFERABLE)
#define PMD_SECT_CACHE_MASK	(PMD_SECT_TEX(1) | PMD_SECT_CACHEABLE | PMD_SECT_BUFFERABLE)
#define PMD_SECT_NONSHARED_DEV	(PMD_SECT_TEX(2))

/*
 *   - coarse table (not used)
 */

/*
 * + Level 2 descriptor (PTE)
 *   - common
 */
#define PTE_TYPE_MASK		(_AT(pteval_t, 3) << 0)
#define PTE_TYPE_FAULT		(_AT(pteval_t, 0) << 0)
#define PTE_TYPE_LARGE		(_AT(pteval_t, 1) << 0)
#define PTE_TYPE_SMALL		(_AT(pteval_t, 2) << 0)
#define PTE_TYPE_EXT		(_AT(pteval_t, 3) << 0)		/* v5 */
#define PTE_BUFFERABLE		(_AT(pteval_t, 1) << 2)
#define PTE_CACHEABLE		(_AT(pteval_t, 1) << 3)

/*
 *   - extended small page/tiny page
 */
#define PTE_EXT_XN		(_AT(pteval_t, 1) << 0)		/* v6 */
#define PTE_EXT_AP_MASK		(_AT(pteval_t, 3) << 4)
#define PTE_EXT_AP0		(_AT(pteval_t, 1) << 4)
#define PTE_EXT_AP1		(_AT(pteval_t, 2) << 4)
#define PTE_EXT_AP_UNO_SRO	(_AT(pteval_t, 0) << 4)
#define PTE_EXT_AP_UNO_SRW	(PTE_EXT_AP0)
#define PTE_EXT_AP_URO_SRW	(PTE_EXT_AP1)
#define PTE_EXT_AP_URW_SRW	(PTE_EXT_AP1|PTE_EXT_AP0)
#define PTE_EXT_TEX(x)		(_AT(pteval_t, (x)) << 6)	/* v5 */
#define PTE_EXT_APX		(_AT(pteval_t, 1) << 9)		/* v6 */
#define PTE_EXT_COHERENT	(_AT(pteval_t, 1) << 9)		/* XScale3 */
#define PTE_EXT_SHARED		(_AT(pteval_t, 1) << 10)	/* v6 */
#define PTE_EXT_NG		(_AT(pteval_t, 1) << 11)	/* v6 */

/*
 *   - small page
 */
#define PTE_SMALL_AP_MASK	(_AT(pteval_t, 0xff) << 4)
#define PTE_SMALL_AP_UNO_SRO	(_AT(pteval_t, 0x00) << 4)
#define PTE_SMALL_AP_UNO_SRW	(_AT(pteval_t, 0x55) << 4)
#define PTE_SMALL_AP_URO_SRW	(_AT(pteval_t, 0xaa) << 4)
#define PTE_SMALL_AP_URW_SRW	(_AT(pteval_t, 0xff) << 4)

#define PHYS_MASK		(~0UL)

#endif

Annotation

Implementation Notes