rt-thread-official/libcpu/arm/arm926/mmu.h

/*
 * Copyright (c) 2006-2018, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 */

#ifndef __MMU_H__
#define __MMU_H__

#include <rtthread.h>

#define CACHE_LINE_SIZE     32

#define DESC_SEC            (0x2|(1<<4))
#define CB                  (3<<2)  //cache_on, write_back
#define CNB                 (2<<2)  //cache_on, write_through
#define NCB                 (1<<2)  //cache_off,WR_BUF on
#define NCNB                (0<<2)  //cache_off,WR_BUF off
#define AP_RW               (3<<10) //supervisor=RW, user=RW
#define AP_RO               (2<<10) //supervisor=RW, user=RO

#define DOMAIN_FAULT        (0x0)
#define DOMAIN_CHK          (0x1)
#define DOMAIN_NOTCHK       (0x3)
#define DOMAIN0             (0x0<<5)
#define DOMAIN1             (0x1<<5)

#define DOMAIN0_ATTR        (DOMAIN_CHK<<0)
#define DOMAIN1_ATTR        (DOMAIN_FAULT<<2)

#define RW_CB       (AP_RW|DOMAIN0|CB|DESC_SEC)     /* Read/Write, cache, write back */
#define RW_CNB      (AP_RW|DOMAIN0|CNB|DESC_SEC)    /* Read/Write, cache, write through */
#define RW_NCNB     (AP_RW|DOMAIN0|NCNB|DESC_SEC)   /* Read/Write without cache and write buffer */
#define RW_FAULT    (AP_RW|DOMAIN1|NCNB|DESC_SEC)   /* Read/Write 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 attr;
};

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

#endif