mm.h

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/*
 *	ApOS (Another Project software for s3c2410)
 *	
 *	This program is free software; you can redistribute it and/or modify
 *	it under the terms of the GNU General Public License version 2 as
 *	published by the Free Software Foundation.
 *			
 *						Copyright caiyuqing
 *
 */
#ifndef _MEMORY_H
#define _MEMORY_H

#define DIR_VALID(dir) 			((dir)&0x00000001)		
#define PAGE_VALID(page)		((page)&0x00000002)

#define DIR_INVALID(dir) 		!((dir)&0x00000001)		
#define PAGE_INVALID(page)		!((page)&0x00000002)		

#define PAGE_TABLE_INDEX(v_addr)	((v_addr)>>20)		//获得页表号的索引
#define PAGE_ENTRY_INDEX(v_addr)	(((v_addr)>>12)&0xff)	//获得页表项的索引


#define SDRAM_BASE			(0x30000000)
#define SDRAM_SIZE			(1024*1024*64)		//我使用的SDRAM大小为64MB
#define SDRAM_LIMIT			(SDRAM_BASE+SDRAM_SIZE)

#define SFR_BASE			(0x48000000)
#define SFR_LIMIT			(0x60000000)

#define PAGE_SIZE			4096
#define SYS_RAM_BASE			0x30000000
#define SYS_RAM_SIZE			(1024*1024*10)		//系统使用了前10MB的空间
#define SYS_RAM_LIMIT			(SYS_RAM_BASE+SYS_RAM_SIZE)
#define SYS_VADDR_BASE			0x30000000
#define SYS_VADDR_SIZE			(1024*1024*10)		//系统使用了前10MB的空间
#define SYS_VADDR_LIMIT			(SYS_VADDR_BASE+SYS_VADDR_SIZE)

#define USER_RAM_BASE			(SYS_RAM_BASE+SYS_RAM_SIZE)
#define USER_RAM_SIZE			(SDRAM_SIZE-SYS_RAM_SIZE)	//64MB的RAM空间除去系统使用的10MB,剩下54MB作为用户空间	
#define USER_VADDR_BASE			(SYS_VADDR_BASE+SYS_VADDR_SIZE)
#define USER_VADDR_SIZE			(SDRAM_SIZE-SYS_RAM_SIZE)
#define RAM_PAGES			(USER_RAM_SIZE>>12)	//用户空间分割成的页数(每页4096 Byte)
/*
 *	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)

/*
 *	内核的起始地址，必须是4KB的边界，所以从我决定从0x30075000开始
 */
#define KERNEL_BASE			0x30075000

#define EXCEPTION_BASE			0xffff0000

#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)

#define SMALL_PAGE			(2<<0)
#define BUFFERABLE			(1<<2)	/* bufferable */
#define CACHEABLE			(1<<3)	/* cacheable */

#define USER_AP0_RW			(3<<4)
#define USER_AP1_RW			(3<<6)
#define USER_AP2_RW			(3<<8)
#define USER_AP3_RW			(3<<10)

#define USER_AP0_R			(2<<4)
#define USER_AP1_R			(2<<6)
#define USER_AP2_R			(2<<8)
#define USER_AP3_R			(2<<10)

#define USER_SMALL_PAGE_DESC_RW		(SMALL_PAGE|CACHEABLE|USER_AP0_RW|USER_AP1_RW|USER_AP2_RW|USER_AP3_RW)
#define USER_SMALL_PAGE_DESC_R		(SMALL_PAGE|CACHEABLE|USER_AP0_R|USER_AP1_R|USER_AP2_R|USER_AP3_R)

#define PAGE_TABLE_ENTRIES		256
#define PAGE_TABLE_ENTRY_SIZE		4
#define PAGE_TABLE_SIZE			(PAGE_TABLE_ENTRIES)*(PAGE_TABLE_ENTRY_SIZE)

#define	SYS_STACK_SIZE			0x8000
#define	IRQ_STACK_SIZE			0x8000
#define	ABORT_STACK_SIZE		0x8000
#define	SVC_STACK_SIZE			0x8000
#define TASK0_STACK_SIZE		0x8000

#define	ABORT_STACK_BASE		0x30A00000-4				
#define	IRQ_STACK_BASE			ABORT_STACK_BASE-ABORT_STACK_SIZE
#define	SYS_STACK_BASE			IRQ_STACK_BASE-IRQ_STACK_SIZE
#define SVC_STACK_BASE			SYS_STACK_BASE-SYS_STACK_SIZE
#define	TASK0_STACK_BASE		SVC_STACK_BASE-TASK0_STACK_SIZE		//0x309dfffd~0x309e7ffc

#define	IRQ_STACK_FRAME_SIZE		68
#define	ABORT_STACK_FRAME_SIZE		68
#define	SVC_STACK_FRAME_SIZE		68

#endif