cpu_asm.h

T-kernel 的extension源代码

/*
 *----------------------------------------------------------------------
 *    T-Kernel / Standard Extension
 *
 *    Copyright (C) 2006 by Ken Sakamura. All rights reserved.
 *    T-Kernel / Standard Extension is distributed 
 *      under the T-License for T-Kernel / Standard Extension.
 *----------------------------------------------------------------------
 *
 *    Version:   1.00.00
 *    Released by T-Engine Forum(http://www.t-engine.org) at 2006/8/11.
 *
 *----------------------------------------------------------------------
 */

/*
 *	cpu_asm.h (memory)
 *
 *	VR4131 (MIPS)-dependent definitions
 *
 *	(*) Also included from assembler sources.
 */

#ifndef _PM_CPU_ASM_H_
#define _PM_CPU_ASM_H_

/* ------------------------------------------------------------------------ */
/*
 *	TLB-related
 *
 *				VR5500		VR4131		TX4956
 *	Physical address space	64GB (36bit)	4GB (32bit)	64GB (36bit)
 *	Minimum page size	4KB		1KB		4KB
 *
 *	In segment management:
 *	* Supports up to 4GB (32bit) of physical address
 *	* Page size is fixed at 4KB
 */

#define	N_TLBENTRY	32	/* Number of TLB entries */

/* Page mask register */
#define	TLB_PMSK_4KB	0x00001800

/* Entry Lo register */
#define	ELO_G		0x00000001	/* Global bit */
#define	ELO_V		0x00000002	/* Valid bit */
#define	ELO_D		0x00000004	/* Dirty bit */
#define	ELO_C		0x00000038	/* Cache field */
#define	ELO_INIT	0x00000011	/* Initial setting value */
#define	ELO_PFNSFT	(12-8)	/* Amount of right shift from physical address to PFN */

/* Entry Hi register */
#define	EHI_VPNMSK	(~0x1fff)	/* Virtual address mask */
#define	EHI_LOSEL	0x1000		/* Selected bits Lo 0,1 */
#define	EHI_ASID	0xff		/* ASID mask */

/* Page table entry (PTE) */
#define	PTE_PFA		(~0xfff)	/* Page frame address */
#define	PTE_A		0x100		/* Access bit */
#define	PTE_P		0x002		/* Page valid bit */
#define	PTE_LOMSK	0x02f		/* Lo setting mask */
#define	PTE_LOPFN	0xfffff000	/* Lo setting physical address (up to 4GB) */

/* ------------------------------------------------------------------------ */
#endif