mmu.h

/*
 * File      : mmu.h
 * This file is part of RT-Thread RTOS
 * COPYRIGHT (C) 2006, RT-Thread Development Team
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Change Logs:
 * Date           Author       Notes
 */

#ifndef __MMU_H__
#define __MMU_H__

#include <rtthread.h>

#define CACHE_LINE_SIZE	32

/*
 * Hardware page table definitions.
 *
 * + Level 1 descriptor (PGD)
 *   - common
 */
#define PGD_TYPE_MASK       (3 << 0)
#define PGD_TYPE_FAULT      (0 << 0)
#define PGD_TYPE_TABLE      (1 << 0)
#define PGD_TYPE_SECT       (2 << 0)
#define PGD_BIT4            (1 << 4)
#define PGD_DOMAIN(x)       ((x) << 5)
#define PGD_PROTECTION      (1 << 9)    /* ARMv5 */
/*
 *   - section
 */
#define PGD_SECT_BUFFERABLE	(1 << 2)
#define PGD_SECT_CACHEABLE  (1 << 3)
#define PGD_SECT_XN         (1 << 4)    /* ARMv6 */
#define PGD_SECT_AP0        (1 << 10)
#define PGD_SECT_AP1        (1 << 11)
#define PGD_SECT_TEX(x)     ((x) << 12) /* ARMv5 */
#define PGD_SECT_APX        (1 << 15)   /* ARMv6 */
#define PGD_SECT_S          (1 << 16)   /* ARMv6 */
#define PGD_SECT_nG         (1 << 17)   /* ARMv6 */
#define PGD_SECT_SUPER      (1 << 18)   /* ARMv6 */

#define PGD_SECT_UNCACHED   (0)
#define PGD_SECT_BUFFERED   (PGD_SECT_BUFFERABLE)
#define PGD_SECT_WT         (PGD_SECT_CACHEABLE)
#define PGD_SECT_WB         (PGD_SECT_CACHEABLE | PGD_SECT_BUFFERABLE)
#define PGD_SECT_MINICACHE  (PGD_SECT_TEX(1) | PGD_SECT_CACHEABLE)
#define PGD_SECT_WBWA       (PGD_SECT_TEX(1) | PGD_SECT_CACHEABLE | PGD_SECT_BUFFERABLE)
#define PGD_SECT_NONSHARED_DEV  (PGD_SECT_TEX(2))


/*
 * + Level 2 descriptor (PTE)
 *   - common
 */
#define PTE_TYPE_MASK       (3 << 0)
#define PTE_TYPE_FAULT      (0 << 0)
#define PTE_TYPE_LARGE      (1 << 0)
#define PTE_TYPE_SMALL      (2 << 0)
#define PTE_TYPE_EXT        (3 << 0)    /* ARMv5 */
#define PTE_BUFFERABLE      (1 << 2)
#define PTE_CACHEABLE       (1 << 3)

/*
 *   - extended small page/tiny page
 */
#define PTE_EXT_XN          (1 << 0)    /* ARMv6 */
#define PTE_EXT_AP_MASK     (3 << 4)
#define PTE_EXT_AP0         (1 << 4)
#define PTE_EXT_AP1         (2 << 4)
#define PTE_EXT_AP_UNO_SRO  (0 << 4)
#define PTE_EXT_AP_UNO_SRW  (PTE_EXT_AP0)
#define PTE_EXT_AP_URO_SRW  (PTE_EXT_AP1)
#define PTE_EXT_AP_URW_SRW  (PTE_EXT_AP1|PTE_EXT_AP0)
#define PTE_EXT_TEX(x)      ((x) << 6)  /* ARMv5 */
#define PTE_EXT_APX         (1 << 9)    /* ARMv6 */
#define PTE_EXT_SHARED      (1 << 10)   /* ARMv6 */
#define PTE_EXT_NG          (1 << 11)   /* ARMv6 */

/*
 *   - small page
 */
#define PTE_SMALL_AP_MASK       (0xff << 4)
#define PTE_SMALL_AP_UNO_SRO    (0x00 << 4)
#define PTE_SMALL_AP_UNO_SRW    (0x55 << 4)
#define PTE_SMALL_AP_URO_SRW    (0xaa << 4)
#define PTE_SMALL_AP_URW_SRW    (0xff << 4)

/*
 *  sector table properities
 */
#define SECT_CB          (PGD_SECT_CACHEABLE|PGD_SECT_BUFFERABLE) //cache_on, write_back
#define SECT_CNB         (PGD_SECT_CACHEABLE)                     //cache_on, write_through
#define SECT_NCB         (PGD_SECT_BUFFERABLE)                    //cache_off,WR_BUF on
#define SECT_NCNB        (0 << 2)                                 //cache_off,WR_BUF off

#define SECT_AP_RW       (PGD_SECT_AP0|PGD_SECT_AP1)              //supervisor=RW, user=RW
#define SECT_AP_RO       ((0 << 10)|(0 << 11))                    //supervisor=RO, user=NO Access(SR=10)

#define SECT_RW_CB      (SECT_AP_RW|PGD_DOMAIN(0)|PGD_SECT_WB|PGD_TYPE_SECT|PGD_BIT4) /* Read/Write, cache, write back */
#define SECT_RW_CNB     (SECT_AP_RW|PGD_DOMAIN(0)|PGD_SECT_WT|PGD_TYPE_SECT|PGD_BIT4) /* Read/Write, cache, write through */
#define SECT_RW_NCNB    (SECT_AP_RW|PGD_DOMAIN(0)|PGD_TYPE_SECT|PGD_BIT4) /* Read/Write without cache and write buffer */
#define SECT_RW_FAULT   (SECT_AP_RW|PGD_DOMAIN(1)|PGD_TYPE_SECT|PGD_BIT4) /* Read/Write without cache and write buffer */

#define SECT_RO_CB      (SECT_AP_RO|PGD_DOMAIN(0)|PGD_SECT_WB|PGD_TYPE_SECT|PGD_BIT4) /* Read Only, cache, write back */
#define SECT_RO_CNB     (SECT_AP_RO|PGD_DOMAIN(0)|PGD_SECT_WT|PGD_TYPE_SECT|PGD_BIT4) /* Read Only, cache, write through */
#define SECT_RO_NCNB    (SECT_AP_RO|PGD_DOMAIN(0)|PGD_TYPE_SECT|PGD_BIT4) /* Read Only without cache and write buffer */
#define SECT_RO_FAULT   (SECT_AP_RO|PGD_DOMAIN(1)|PGD_TYPE_SECT|PGD_BIT4) /* Read Only without cache and write buffer */

#define SECT_TO_PAGE     (PGD_DOMAIN(0)|PGD_TYPE_TABLE|PGD_BIT4) /* Level 2 descriptor (PTE) entry properity */

/*
 * page table properities
 */
#define PAGE_CB          (PTE_BUFFERABLE|PTE_CACHEABLE)  //cache_on, write_back
#define PAGE_CNB         (PTE_CACHEABLE)                 //cache_on, write_through
#define PAGE_NCB         (PTE_BUFFERABLE)                //cache_off,WR_BUF on
#define PAGE_NCNB        (0 << 2)                        //cache_off,WR_BUF off

#define PAGE_AP_RW       PTE_SMALL_AP_URW_SRW             //supervisor=RW, user=RW
#define PAGE_AP_RO       PTE_SMALL_AP_UNO_SRO             //supervisor=RO, user=NO Access(SR=10)

#define PAGE_RW_CB      (PAGE_AP_RW|PAGE_CB|PTE_TYPE_SMALL) /* Read/Write, cache, write back */
#define PAGE_RW_CNB     (PAGE_AP_RW|PAGE_CNB|PTE_TYPE_SMALL) /* Read/Write, cache, write through */
#define PAGE_RW_NCNB    (PAGE_AP_RW|PTE_TYPE_SMALL) /* Read/Write without cache and write buffer */
#define PAGE_RW_FAULT   (PAGE_AP_RW|PTE_TYPE_SMALL) /* Read/Write without cache and write buffer */


#define PAGE_RO_CB      (PAGE_AP_RO|PAGE_CB|PTE_TYPE_SMALL) /* Read Only, cache, write back */
#define PAGE_RO_CNB     (PAGE_AP_RO|PAGE_CNB|PTE_TYPE_SMALL) /* Read Only, cache, write through */
#define PAGE_RO_NCNB    (PAGE_AP_RO|PTE_TYPE_SMALL) /* Read Only without cache and write buffer */
#define PAGE_RO_FAULT   (PAGE_AP_RO|PTE_TYPE_SMALL) /* Read Only without cache and write buffer */

struct mem_desc {
	rt_uint32_t vaddr_start;
	rt_uint32_t vaddr_end;
	rt_uint32_t paddr_start;
	rt_uint32_t sect_attr;   /* when page mapped */
	rt_uint32_t page_attr;   /* only sector mapped valid */
	rt_uint32_t mapped_mode;
	#define     SECT_MAPPED  0
	#define     PAGE_MAPPED  1
};


void rt_hw_mmu_init(struct mem_desc *mdesc, rt_uint32_t size);

#endif