arch/powerpc/boot/page.h

Source file repositories/reference/linux-study-clean/arch/powerpc/boot/page.h

File Facts

System
Linux kernel
Corpus path
arch/powerpc/boot/page.h
Extension
.h
Size
896 bytes
Lines
31
Domain
Architecture Layer
Bucket
arch/powerpc
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 _PPC_BOOT_PAGE_H
#define _PPC_BOOT_PAGE_H
/*
 * Copyright (C) 2001 PPC64 Team, IBM Corp
 */

#ifdef __ASSEMBLER__
#define ASM_CONST(x) x
#else
#define __ASM_CONST(x) x##UL
#define ASM_CONST(x) __ASM_CONST(x)
#endif

/* PAGE_SHIFT determines the page size */
#define PAGE_SHIFT	12
#define PAGE_SIZE	(ASM_CONST(1) << PAGE_SHIFT)
#define PAGE_MASK	(~(PAGE_SIZE-1))

/* align addr on a size boundary - adjust address up/down if needed */
#define _ALIGN_UP(addr, size)	(((addr)+((size)-1))&(~((typeof(addr))(size)-1)))
#define _ALIGN_DOWN(addr, size)	((addr)&(~((typeof(addr))(size)-1)))

/* align addr on a size boundary - adjust address up if needed */
#define _ALIGN(addr,size)     _ALIGN_UP(addr,size)

/* to align the pointer to the (next) page boundary */
#define PAGE_ALIGN(addr)	_ALIGN(addr, PAGE_SIZE)

#endif				/* _PPC_BOOT_PAGE_H */

Annotation

Implementation Notes