113 lines
2.5 KiB
C
113 lines
2.5 KiB
C
/*
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* mmu.h
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*
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* This file is part of BaS_gcc.
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*
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* BaS_gcc is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* BaS_gcc is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with BaS_gcc. If not, see <http://www.gnu.org/licenses/>.
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*
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* Created on: 26.02.2013
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* Author: Markus Fröschle
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*/
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#ifndef _MMU_H_
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#define _MMU_H_
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#include <stddef.h>
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#include "bas_types.h"
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/*
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* ACR register handling macros
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*/
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#define ACR_BA(x) ((x) & 0xffff0000)
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#define ACR_ADMSK(x) (((x) & 0xffff) << 16)
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#define ACR_E(x) (((x) & 1) << 15)
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#define ACR_S(x) (((x) & 3) << 13)
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#define ACR_S_USERMODE 0
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#define ACR_S_SUPERVISOR_MODE 1
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#define ACR_S_ALL 2
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#define ACR_ADDRESS_MASK_MODE(x) (((x) & 1) << 10)
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#define ACR_CACHE_MODE(x) (((x) & 3) << 5)
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#define ACR_SUPERVISOR_PROTECT(x) (((x) & 1) << 3)
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#define ACR_WRITE_PROTECT(x) (((x) & 1) << 2)
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/*
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* MMU register handling macros
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*/
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#define SCA_PAGE_ID 6 /* indicates video memory page */
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/*
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* MMU page sizes
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*/
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enum mmu_page_size
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{
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MMU_PAGE_SIZE_1M = 0,
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MMU_PAGE_SIZE_4K = 1,
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MMU_PAGE_SIZE_8K = 2,
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MMU_PAGE_SIZE_1K = 3
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};
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/*
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* cache modes
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*/
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#define CACHE_WRITETHROUGH 0
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#define CACHE_COPYBACK 1
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#define CACHE_NOCACHE_PRECISE 2
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#define CACHE_NOCACHE_IMPRECISE 3
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/*
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* page flags
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*/
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#define SV_PROTECT 1
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#define SV_USER 0
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#define ACCESS_READ (1 << 0)
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#define ACCESS_WRITE (1 << 1)
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#define ACCESS_EXECUTE (1 << 2)
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struct mmu_map_flags
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{
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unsigned cache_mode:2;
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unsigned protection:1;
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unsigned page_id:8;
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unsigned access:3;
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unsigned locked:1;
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unsigned unused:17;
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};
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/*
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* global variables from linker script
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*/
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extern long video_tlb;
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extern long video_sbt;
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extern void mmu_init(void);
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extern int mmu_map_page(uint32_t virt, uint32_t phys, enum mmu_page_size sz, const struct mmu_map_flags *flags);
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/*
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* API functions for the BaS driver interface
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*/
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extern int32_t mmu_map_page_locked(uint32_t address, uint32_t length);
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extern int32_t mmu_unlock_page(uint32_t address, uint32_t length);
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extern int32_t mmu_report_locked_pages(void);
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#endif /* _MMU_H_ */
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