git.sesse.net Git - pistorm/blob - platforms/amiga/amiga-registers.c

   1 #include "../../Gayle.h"
   2 #include "../../config_file/config_file.h"
   3
   4 #define GAYLEBASE 0xD80000  // D7FFFF
   5 #define GAYLESIZE 0x6FFFF
   6
   7 #define CLOCKBASE 0xDC0000
   8 #define CLOCKSIZE 0x010000
   9
  10 uint8_t rtc_emulation_enabled = 1;
  11
  12 void configure_rtc_emulation_amiga(uint8_t enabled) {
  13     if (enabled == rtc_emulation_enabled)
  14         return;
  15
  16     rtc_emulation_enabled = enabled;
  17     printf("Amiga RTC emulation is now %s.\n", (enabled) ? "enabled" : "disabled");
  18 }
  19
  20 int handle_register_read_amiga(unsigned int addr, unsigned char type, unsigned int *val) {
  21     if (!rtc_emulation_enabled && addr >= CLOCKBASE && addr < CLOCKBASE + CLOCKSIZE)
  22         return -1;
  23     if (addr >= GAYLEBASE && addr < GAYLEBASE + GAYLESIZE) {
  24         switch(type) {
  25         case OP_TYPE_BYTE:
  26             *val = readGayleB(addr);
  27             return 1;
  28             break;
  29         case OP_TYPE_WORD:
  30             *val = readGayle(addr);
  31             return 1;
  32             break;
  33         case OP_TYPE_LONGWORD:
  34             *val = readGayleL(addr);
  35             return 1;
  36             break;
  37         case OP_TYPE_MEM:
  38             return -1;
  39             break;
  40         }
  41     }
  42     return -1;
  43 }
  44
  45 int handle_register_write_amiga(unsigned int addr, unsigned int value, unsigned char type) {
  46     if (!rtc_emulation_enabled && addr >= CLOCKBASE && addr < CLOCKBASE + CLOCKSIZE)
  47         return -1;
  48     if (addr >= GAYLEBASE && addr < GAYLEBASE + GAYLESIZE) {
  49         switch(type) {
  50         case OP_TYPE_BYTE:
  51             writeGayleB(addr, value);
  52             return 1;
  53             break;
  54         case OP_TYPE_WORD:
  55             writeGayle(addr, value);
  56             return 1;
  57             break;
  58         case OP_TYPE_LONGWORD:
  59             writeGayleL(addr, value);
  60             return 1;
  61             break;
  62         case OP_TYPE_MEM:
  63             return -1;
  64             break;
  65         }
  66     }
  67     return -1;
  68 }