mmu.h

这是Linux环境下的内核引导程序miniboot0.8

#ifndef _MMU_H
#define _MMU_H
#include "s3c2410.h"

#define SDRAM_BASE			0x30000000
#define SDRAM_LIMIT			0x34000000

#define SFR_BASE			0x48000000
#define SFR_LIMIT			0x60000000

#define EXCEPTION_VECTOR_BASE		0xffff0000
#define EXCEPTION_VECTOR_LIMIT		0xffffffff

#define DSP_BASE			0x08000000
#define DSP_LIMIT			0x10000000

#define SMALL_PAGE_SIZE			4096
/*
 *
 */
#define PAGE_TABLE_ENTRIES		256
#define PAGE_TABLE_ENTRY_SIZE		4
#define PAGE_TABLE_SIZE			(PAGE_TABLE_ENTRIES)*(PAGE_TABLE_ENTRY_SIZE)

/*
 *	DIRECTORY: 页目录表，该表总共有4096个目录项
 *	所处地址范围:	0x30000000~0x30003fff
 */
#define DIRECTORY_ENTRIES		4096
#define DIRECTORY_ENTRY_SIZE		4
#define DIRECTORY_BASE			0x30000000
#define DIRECTORY_SIZE			(DIRECTORY_ENTRIES)*(DIRECTORY_ENTRY_SIZE)

/*
 *	RAM_PAGE_TABLE_BASE: SDRAM的页表，总共有64个页表
 *	每个页表有256个页表项
 *	所处地址范围:	0x30004000~0x30013fff
 */
#define RAM_PAGE_TABLE_BASE		(DIRECTORY_BASE)+(DIRECTORY_SIZE)
#define RAM_PAGE_TABLES			((SDRAM_LIMIT)-(SDRAM_BASE))>>20
#define RAM_PAGE_TABLE_SIZE		(RAM_PAGE_TABLES)*(PAGE_TABLE_SIZE)
/*
 *	SFR_PAGE_TABLE_BASE: SFR的页表，总共有384个页表
 *	每个页表有256个页表项
 *	所处地址范围:	0x30014000~0x30073fff
 */
#define SFR_PAGE_TABLE_BASE		(RAM_PAGE_TABLE_BASE)+(RAM_PAGE_TABLE_SIZE)
#define SFR_PAGE_TABLES			((SFR_LIMIT)-(SFR_BASE))>>20
#define SFR_PAGE_TABLE_SIZE		(SFR_PAGE_TABLES)*(PAGE_TABLE_SIZE)

/*
 *	VECTOR_PAGE_TABLE_BASE：中断向量表所使用的页表，只需要1个页表
 *	该表有256个页表项
 *	所处地址范围:	0x30074000~0x300743ff
 */
#define VECTOR_PAGE_TABLE_BASE		(SFR_PAGE_TABLE_BASE)+(SFR_PAGE_TABLE_SIZE)
#define VECTOR_PAGE_TABLES		1
#define VECTOR_PAGE_TABLE_SIZE		(VECTOR_PAGE_TABLES)*(PAGE_TABLE_SIZE)

/*
 *	DSP_PAGE_TABLE_BASE：DSP地址使用的页表，只需要128个页表
 *	每个页表有256个页表项
 *	所处地址范围:	0x30075000~0x30094fff
 */
#define DSP_PAGE_TABLE_BASE		0x30075000
#define DSP_PAGE_TABLES			((DSP_LIMIT)-(DSP_BASE))>>20
#define DSP_PAGE_TABLE_SIZE		(DSP_PAGE_TABLES)*(PAGE_TABLE_SIZE)


/*
 *	内核的起始地址，必须是4KB的边界，所以从我决定从0x30095000开始
 */
#define KERNEL_BASE			0x30095000

//Level One Descriptor Attribute
#define COARSE_PAGE			(1) 	/* indicates that this is a Coarse page descriptor */
#define SPECIAL				(1<<4)	/* must be 1 */
#define CLIENT				(0<<5)
#define MANAGER				(1<<5)
#define COARSE_PAGE_DESC		(COARSE_PAGE|SPECIAL)
//Level Two Descriptor Attribute
#define SMALL_PAGE			(2<<0)
#define BUFFERABLE			(1<<2)	/* bufferable */
#define CACHEABLE			(1<<3)	/* cacheable */

/*
 *	Supervisor模式下的代码对该页的访问具有read/write权限
 *	User模式下的代码对该页的访问具有read权限
 */
#define AP0				(2<<4)
#define AP1				(2<<6)
#define AP2				(2<<8)
#define AP3				(2<<10)
#define SMALL_PAGE_DESC			(SMALL_PAGE|AP0|AP1|AP2|AP3)

#endif