/* * 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 #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