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Annotation of hatari/src/uae-cpu/hatari-glue.c, revision 1.1

1.1     ! root        1: 
        !             2: #include <stdio.h>
        !             3: 
        !             4: #include "newcpu.h"
        !             5: 
        !             6: #include "../includes/main.h"
        !             7: #include "../includes/int.h"
        !             8: #include "../includes/tos.h"
        !             9: 
        !            10: 
        !            11: 
        !            12: #ifndef FALSE
        !            13: #define FALSE 0
        !            14: #define TRUE 1
        !            15: #endif
        !            16: 
        !            17: 
        !            18: int illegal_mem = FALSE;
        !            19: int address_space_24 = 1;
        !            20: int cpu_level = 0;              /* 68000 (default) */
        !            21: int cpu_compatible = 0;
        !            22: int m68k_speed = 0;
        !            23: 
        !            24: long STmem_size = 0x100000;  /* 1MB */
        !            25: long TTmem_size = 0;
        !            26: 
        !            27: 
        !            28: /* Reset custom chips */
        !            29: void customreset(void)
        !            30: {
        !            31:  /* Taken from Reset_ST in reset.c: */
        !            32:  Int_Reset();                                  // Reset interrupts
        !            33:  MFP_Reset();                                  // Setup MFP chip
        !            34:  Video_Reset();                                        // Reset video
        !            35:  PSG_Reset();                                  // Reset PSG
        !            36:  Sound_Reset();                                        // Reset Sound
        !            37:  IKBD_Reset(FALSE);                            // Keyboard     
        !            38:  Screen_Reset();                               // Reset screen
        !            39: 
        !            40:  // And VBL interrupt, MUST always be one interrupt ready to trigger
        !            41:  Int_AddAbsoluteInterrupt(CYCLES_ENDLINE,INTERRUPT_VIDEO_ENDLINE);
        !            42:  Int_AddAbsoluteInterrupt(CYCLES_HBL,INTERRUPT_VIDEO_HBL);
        !            43:  Int_AddAbsoluteInterrupt(CYCLES_PER_FRAME,INTERRUPT_VIDEO_VBL);
        !            44: }
        !            45: 
        !            46: int intlev (void) /* ??? */
        !            47: {
        !            48:   return -1;
        !            49: }
        !            50: 
        !            51: 
        !            52: /* Initialize 680x0 emulation, CheckROM() must have been called first */
        !            53: int Init680x0(void)
        !            54: {
        !            55:  memory_init();
        !            56: fprintf(stderr, "TOS version: %x.%x\n", STMemory_ReadByte(2), STMemory_ReadByte(3));
        !            57: fprintf(stderr, "PC start: $%lx\n", STMemory_ReadLong(4));
        !            58: 
        !            59:  init_m68k();
        !            60: #ifdef USE_COMPILER
        !            61:  compiler_init();
        !            62: #endif
        !            63:  return TRUE;
        !            64: }
        !            65: 
        !            66: 
        !            67: /* Deinitialize 680x0 emulation */
        !            68: void Exit680x0(void)
        !            69: {
        !            70: }
        !            71: 
        !            72: 
        !            73: /* Reset and start 680x0 emulation */
        !            74: void Start680x0(void)
        !            75: {
        !            76:  m68k_reset();
        !            77:  m68k_go(TRUE);
        !            78: }
        !            79: 
        !            80: 
        !            81: /* ----------------------------------------------------------------------- */
        !            82: /*
        !            83:   We use an illegal opcode to set ConnectedDrives, as TOS clears this
        !            84:   value we cannot set it on init.
        !            85: */
        !            86: unsigned long OpCode_ConnectedDrive(uae_u32 opcode)
        !            87: {
        !            88:  fprintf(stderr, "OpCode_ConnectedDrive handled\n");
        !            89:  /* Set connected drives */
        !            90:  STMemory_WriteWord(0x4c2, ConnectedDriveMask);
        !            91:  m68k_incpc(2);
        !            92:  return 2;
        !            93: }
        !            94: 
        !            95: /* ----------------------------------------------------------------------- */
        !            96: /*
        !            97:   Modify TimerD in GEMDos to gain more desktop performance
        !            98: 
        !            99:   Obviously, we need to emulate all timers correctly but GemDOS set's up Timer D at a very
        !           100:   high rate(every couple of instructions). The interrupts isn't enabled but WinSTon still
        !           101:   needs to process the interrupt table and this HALVES our frame rate!!! (It causes a cache
        !           102:   reload each time). Some games actually reference this timer but don't set it up(eg Paradroid,
        !           103:   Speedball I) so we simply intercept the Timer D setup code in GemDOS and fix the numbers
        !           104:   with more 'laid-back' values. This still keeps 100% compatibility
        !           105: */
        !           106: unsigned long OpCode_TimerD(uae_u32 opcode)
        !           107: {
        !           108:  fprintf(stderr, "OpCode_TimerD handled\n");
        !           109:  m68k_dreg(regs,0)=3;  /* 3 = Select Timer D */
        !           110:  m68k_dreg(regs,1)=7;  /* 1 = /4 for 9600 baud(used /200) */
        !           111:  m68k_dreg(regs,2)=100;        /* 2 = 9600 baud(100) */
        !           112:  m68k_incpc(2);
        !           113:  return 2;
        !           114: }

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