arch/mips/include/asm/addrspace.h

Source file repositories/reference/linux-study-clean/arch/mips/include/asm/addrspace.h

File Facts

System
Linux kernel
Corpus path
arch/mips/include/asm/addrspace.h
Extension
.h
Size
4121 bytes
Lines
150
Domain
Architecture Layer
Bucket
arch/mips
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_ADDRSPACE_H
#define _ASM_ADDRSPACE_H

#include <spaces.h>

/*
 *  Configure language
 */
#ifdef __ASSEMBLER__
#define _ATYPE_
#define _ATYPE32_
#define _ATYPE64_
#define _CONST64_(x)	x
#else
#define _ATYPE_		__PTRDIFF_TYPE__
#define _ATYPE32_	int
#define _ATYPE64_	__s64
#ifdef CONFIG_64BIT
#define _CONST64_(x)	x ## L
#else
#define _CONST64_(x)	x ## LL
#endif
#endif

/*
 *  32-bit MIPS address spaces
 */
#ifdef __ASSEMBLER__
#define _ACAST32_
#define _ACAST64_
#else
#define _ACAST32_		(_ATYPE_)(_ATYPE32_)	/* widen if necessary */
#define _ACAST64_		(_ATYPE64_)		/* do _not_ narrow */
#endif

/*
 * Returns the kernel segment base of a given address
 */
#define KSEGX(a)		((_ACAST32_(a)) & _ACAST32_(0xe0000000))

/*
 * Gives the size of each kernel segment
 */
#define CSEGX_SIZE		0x20000000

/*
 * Returns the physical address of a CKSEGx / XKPHYS address
 */
#define CPHYSADDR(a)		((_ACAST32_(a)) & 0x1fffffff)
#define XPHYSADDR(a)		((_ACAST64_(a)) &			\
				 _CONST64_(0x0000ffffffffffff))

#ifdef CONFIG_64BIT

/*
 * Memory segments (64bit kernel mode addresses)
 * The compatibility segments use the full 64-bit sign extended value.  Note
 * the R8000 doesn't have them so don't reference these in generic MIPS code.
 */
#define XKUSEG			_CONST64_(0x0000000000000000)
#define XKSSEG			_CONST64_(0x4000000000000000)
#define XKPHYS			_CONST64_(0x8000000000000000)
#define XKSEG			_CONST64_(0xc000000000000000)
#define CKSEG0			_CONST64_(0xffffffff80000000)
#define CKSEG1			_CONST64_(0xffffffffa0000000)
#define CKSSEG			_CONST64_(0xffffffffc0000000)
#define CKSEG3			_CONST64_(0xffffffffe0000000)

#define CKSEG0ADDR(a)		(CPHYSADDR(a) | CKSEG0)
#define CKSEG1ADDR(a)		(CPHYSADDR(a) | CKSEG1)
#define CKSEG2ADDR(a)		(CPHYSADDR(a) | CKSEG2)
#define CKSEG3ADDR(a)		(CPHYSADDR(a) | CKSEG3)

#else

#define CKSEG0ADDR(a)		(CPHYSADDR(a) | KSEG0)
#define CKSEG1ADDR(a)		(CPHYSADDR(a) | KSEG1)
#define CKSEG2ADDR(a)		(CPHYSADDR(a) | KSEG2)
#define CKSEG3ADDR(a)		(CPHYSADDR(a) | KSEG3)

/*
 * Map an address to a certain kernel segment
 */
#define KSEG0ADDR(a)		(CPHYSADDR(a) | KSEG0)
#define KSEG1ADDR(a)		(CPHYSADDR(a) | KSEG1)
#define KSEG2ADDR(a)		(CPHYSADDR(a) | KSEG2)
#define KSEG3ADDR(a)		(CPHYSADDR(a) | KSEG3)

/*
 * Memory segments (32bit kernel mode addresses)

Annotation

Implementation Notes