lxdream.org :: lxdream/src/aica/armmem.c r14:fc481a638848

tree revision 29:c29373ff63ee

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     1 #include <stdlib.h>

     2 #include "dream.h"

     3 #include "mem.h"

     5 char *arm_mem = NULL;

     7 void arm_mem_init() {

     8     arm_mem = mem_get_region_by_name( MEM_REGION_AUDIO );

    10 }

    12 int arm_has_page( uint32_t addr ) {

    13     return ( addr < 0x00200000 ||

    14 	     (addr >= 0x00800000 && addr <= 0x00805000 ) );

    15 }

    17 int32_t arm_read_long( uint32_t addr ) {

    18     if( addr < 0x00200000 ) {

    19 	return *(int32_t *)(arm_mem + addr);

    20 	/* Main sound ram */

    21     } else if( addr >= 0x00800000 && addr <= 0x00803000 ) {

    22 	/* Sound registers / scratch ram */

    23     } else {

    24 	/* Undefined memory */

    25 	ERROR( "Attempted long read to undefined page: %08X",

    26 	       addr );

    27 	return 0;

    28     }

    29 }

    31 int16_t arm_read_word( uint32_t addr ) {

    32     if( addr < 0x00200000 ) {

    33 	return *(int16_t *)(arm_mem + addr);

    34 	/* Main sound ram */

    35     } else {

    36 	/* Undefined memory */

    37 	ERROR( "Attempted word read to undefined page: %08X",

    38 	       addr );

    39 	return 0;

    40     }

    42 }

    44 int8_t arm_read_byte( uint32_t addr ) {

    45     if( addr < 0x00200000 ) {

    46 	return *(int8_t *)(arm_mem + addr);

    47 	/* Main sound ram */

    48     } else {

    49 	/* Undefined memory */

    50 	ERROR( "Attempted byte read to undefined page: %08X",

    51 	       addr );

    52 	return 0;

    53     }

    54 }

    56 uint32_t arm_read_long_user( uint32_t addr ) {

    58 }

    60 uint32_t arm_read_byte_user( uint32_t addr ) {

    62 }