84 lines
1.8 KiB
C
84 lines
1.8 KiB
C
/*
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* mmu.c
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*
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* Created on: 01.08.2013
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* Author: froesm1
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*/
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#include <MCF5475.h>
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#include "mmu.h"
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void mmu_init(void)
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{
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uint32_t regval;
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/*
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* set ASID and shadow register
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*/
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__asm__ __volatile__("clr.l d0\n\t"
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"movec d0,ASID\n\t"
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"move.l d0,_rt_asid\n\t");
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/*
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* set ACR0 and shadow register
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*/
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__asm__ __volatile__("move.l #0xc03fc040,d0\n\t"
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"movec d0,ACR0\n\t"
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"move.l d0,_rt_acr0\n\t");
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/*
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* set ACR1 and shadow register
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*/
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__asm__ __volatile__("move.l #0x601fc000, d0\n\t"
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"movec d0,ACR1\n\t"
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"move.l d0,_rt_acr1\n\t");
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/*
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* set ACR2 and shadow register
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*/
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__asm__ __volatile__("move.l #0xe007c400,d0\n\t"
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"movec d0,ACR2\n\t"
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"move.l d0,_rt_acr2\n\t");
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/*
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* set ACR3 and shadow register (currently unused)
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*/
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__asm__ __volatile__("clr.l d0\n\t"
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"movec d0,ACR3\n\t"
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"move.l d0,_rt_acr3\n\t");
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/*
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* set MMUBAR
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*/
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__asm__ __volatile__("movel. #__MMUBAR+1,d0\n\t"
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"movec d0,MMUBAR\n\t"
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"move.l d0,_rt_mmubar\n\t"
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"nop\n\t");
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MCF_MMU_MMUOR = MCF_MMU_MMUOR; /* clear all entries */
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/*
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* 0x00000000 locked
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*/
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MCF_MMU_MMUTR = 0x0L | STD_MMUTR;
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MCF_MMU_MMUDR = 0x0L | COPYBACK_MMUDR | MCF_MMU_MMUDR_LK;
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MCF_MMU_MMUOR = MMUORD_D;
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MCF_MMU_MMUOR = MMUORD_I;
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/*
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* 0x00d00000 locked ID=6
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* video RAM: read write execute normal write true
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*/
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MCF_MMU_MMUTR = 0x00d00000 | MCF_MMU_MMUTR_ID(SCA_PAGE_ID) | STD_MMUTR;
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MCF_MMU_MMUDR = 0x60d00000 | WRITETHROUGH_MMUDR | MCF_MMU_MMUDR_LK;
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MCF_MMU_MMUOR = MMUORD_D;
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MCF_MMU_MMUOR = 0x00d00000 | STD_MMUTR;
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video_tlb = 0x2000;
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video_sbt = 0;
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}
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__attribute__((interrupt)) void mmutr_miss(void)
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{
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}
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