nkeynes@31: /**
nkeynes@40:  * $Id: armmem.c,v 1.6 2005-12-26 10:48:20 nkeynes Exp $
nkeynes@31:  *
nkeynes@31:  * Implements the ARM's memory map.
nkeynes@31:  *
nkeynes@31:  * Copyright (c) 2005 Nathan Keynes.
nkeynes@31:  *
nkeynes@31:  * This program is free software; you can redistribute it and/or modify
nkeynes@31:  * it under the terms of the GNU General Public License as published by
nkeynes@31:  * the Free Software Foundation; either version 2 of the License, or
nkeynes@31:  * (at your option) any later version.
nkeynes@31:  *
nkeynes@31:  * This program is distributed in the hope that it will be useful,
nkeynes@31:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
nkeynes@31:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
nkeynes@31:  * GNU General Public License for more details.
nkeynes@31:  */
nkeynes@31: 
nkeynes@11: #include <stdlib.h>
nkeynes@11: #include "dream.h"
nkeynes@7: #include "mem.h"
nkeynes@7: 
nkeynes@11: char *arm_mem = NULL;
nkeynes@40: char *arm_mem_scratch = NULL;
nkeynes@11: 
nkeynes@7: void arm_mem_init() {
nkeynes@11:     arm_mem = mem_get_region_by_name( MEM_REGION_AUDIO );
nkeynes@40:     arm_mem_scratch = mem_get_region_by_name( MEM_REGION_AUDIO_SCRATCH );
nkeynes@7: }
nkeynes@7: 
nkeynes@14: int arm_has_page( uint32_t addr ) {
nkeynes@14:     return ( addr < 0x00200000 ||
nkeynes@14: 	     (addr >= 0x00800000 && addr <= 0x00805000 ) );
nkeynes@14: }
nkeynes@14: 
nkeynes@37: uint32_t arm_read_long( uint32_t addr ) {
nkeynes@11:     if( addr < 0x00200000 ) {
nkeynes@11: 	return *(int32_t *)(arm_mem + addr);
nkeynes@11: 	/* Main sound ram */
nkeynes@11:     } else {
nkeynes@37: 	switch( addr & 0xFFFFF000 ) {
nkeynes@37: 	case 0x00800000:
nkeynes@37: 	    return mmio_region_AICA0_read(addr);
nkeynes@37: 	case 0x00801000:
nkeynes@37: 	    return mmio_region_AICA1_read(addr);
nkeynes@37: 	case 0x00802000:
nkeynes@37: 	    return mmio_region_AICA2_read(addr);
nkeynes@37: 	case 0x00803000:
nkeynes@37: 	case 0x00804000:
nkeynes@40: 	    return *(int32_t *)(arm_mem_scratch + addr - 0x00803000);
nkeynes@37: 	}
nkeynes@11:     }
nkeynes@37:     ERROR( "Attempted long read to undefined page: %08X",
nkeynes@37: 	   addr );
nkeynes@37:     /* Undefined memory */
nkeynes@37:     return 0;
nkeynes@7: }
nkeynes@7: 
nkeynes@37: uint32_t arm_read_word( uint32_t addr ) {
nkeynes@40:     return (uint32_t)(uint16_t)arm_read_long( addr );
nkeynes@7: }
nkeynes@7: 
nkeynes@37: uint32_t arm_read_byte( uint32_t addr ) {
nkeynes@40:     return (uint32_t)(uint8_t)arm_read_long( addr );
nkeynes@7: }
nkeynes@7: 
nkeynes@37: void arm_write_long( uint32_t addr, uint32_t value )
nkeynes@37: {
nkeynes@37:     if( addr < 0x00200000 ) {
nkeynes@40: 	/* Main sound ram */
nkeynes@37: 	*(uint32_t *)(arm_mem + addr) = value;
nkeynes@37:     } else {
nkeynes@40: 	switch( addr & 0xFFFFF000 ) {
nkeynes@40: 	case 0x00800000:
nkeynes@40: 	    mmio_region_AICA0_write(addr, value);
nkeynes@40: 	    break;
nkeynes@40: 	case 0x00801000:
nkeynes@40: 	    mmio_region_AICA1_write(addr, value);
nkeynes@40: 	    break;
nkeynes@40: 	case 0x00802000:
nkeynes@40: 	    mmio_region_AICA2_write(addr, value);
nkeynes@40: 	    break;
nkeynes@40: 	case 0x00803000:
nkeynes@40: 	case 0x00804000:
nkeynes@40: 	    *(uint32_t *)(arm_mem_scratch + addr - 0x00803000) = value;
nkeynes@40: 	    break;
nkeynes@40: 	default:
nkeynes@40: 	    ERROR( "Attempted long write to undefined address: %08X",
nkeynes@40: 		   addr );
nkeynes@40: 	    /* Undefined memory */
nkeynes@40: 	} 
nkeynes@37:     }
nkeynes@40:     return 0;
nkeynes@37: }
nkeynes@37: 
nkeynes@37: void arm_write_byte( uint32_t addr, uint32_t value )
nkeynes@37: {
nkeynes@37:     if( addr < 0x00200000 ) {
nkeynes@40: 	/* Main sound ram */
nkeynes@40: 	*(uint8_t *)(arm_mem + addr) = (uint8_t)value;
nkeynes@37:     } else {
nkeynes@40: 	switch( addr & 0xFFFFF000 ) {
nkeynes@40: 	case 0x00800000:
nkeynes@40: 	    mmio_region_AICA0_write(addr, value);
nkeynes@40: 	    break;
nkeynes@40: 	case 0x00801000:
nkeynes@40: 	    mmio_region_AICA1_write(addr, value);
nkeynes@40: 	    break;
nkeynes@40: 	case 0x00802000:
nkeynes@40: 	    mmio_region_AICA2_write(addr, value);
nkeynes@40: 	    break;
nkeynes@40: 	case 0x00803000:
nkeynes@40: 	case 0x00804000:
nkeynes@40: 	    *(uint8_t *)(arm_mem_scratch + addr - 0x00803000) = (uint8_t)value;
nkeynes@40: 	    break;
nkeynes@40: 	default:
nkeynes@40: 	    ERROR( "Attempted byte write to undefined address: %08X",
nkeynes@40: 		   addr );
nkeynes@40: 	    /* Undefined memory */
nkeynes@40: 	} 
nkeynes@37:     }
nkeynes@40:     return 0;
nkeynes@37: }
nkeynes@37: 
nkeynes@37: /* User translations - TODO */
nkeynes@37: 
nkeynes@11: uint32_t arm_read_long_user( uint32_t addr ) {
nkeynes@37:     return arm_read_long( addr );
nkeynes@11: }
nkeynes@11: 
nkeynes@11: uint32_t arm_read_byte_user( uint32_t addr ) {
nkeynes@37:     return arm_read_byte( addr );
nkeynes@37: }
nkeynes@11: 
nkeynes@37: void arm_write_long_user( uint32_t addr, uint32_t val ) {
nkeynes@37:     arm_write_long( addr, val );
nkeynes@11: }
nkeynes@37: 
nkeynes@37: void arm_write_byte_user( uint32_t addr, uint32_t val )
nkeynes@37: {
nkeynes@37:     arm_write_byte( addr, val );
nkeynes@37: }