sys.h

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#ifndef _SYS_H_
#define _SYS_H_


#define PROCESS_PALETTE_FADING      (1 << 0)
#define PROCESS_BITMAP_TASK         (1 << 1)
#define PROCESS_DMA_TASK            (1 << 2)
#define PROCESS_XGM_TASK            (1 << 3)
#define PROCESS_VDP_SCROLL_TASK     (1 << 4)


#define ROM_ALIGN_BIT               17
#define ROM_ALIGN                   (1 << ROM_ALIGN_BIT)
#define ROM_ALIGN_MASK              (ROM_ALIGN - 1)

#define ROM_START                   0
#define ROM_END                     (((u32) &_stext) + ((u32) &_sdata))
#define ROM_SIZE                    ((ROM_END + ROM_ALIGN_MASK) & (~ROM_ALIGN_MASK))


// exist through rom_head.c
typedef struct
{
    char console[16];               /* Console Name (16) */
    char copyright[16];             /* Copyright Information (16) */
    char title_local[48];           /* Domestic Name (48) */
    char title_int[48];             /* Overseas Name (48) */
    char serial[14];                /* Serial Number (2, 12) */
    u16 checksum;                   /* Checksum (2) */
    char IOSupport[16];             /* I/O Support (16) */
    u32 rom_start;                  /* ROM Start Address (4) */
    u32 rom_end;                    /* ROM End Address (4) */
    u32 ram_start;                  /* Start of Backup RAM (4) */
    u32 ram_end;                    /* End of Backup RAM (4) */
    char sram_sig[2];               /* "RA" for save ram (2) */
    u16 sram_type;                  /* 0xF820 for save ram on odd bytes (2) */
    u32 sram_start;                 /* SRAM start address - normally 0x200001 (4) */
    u32 sram_end;                   /* SRAM end address - start + 2*sram_size (4) */
    char modem_support[12];         /* Modem Support (24) */
    char notes[40];                 /* Memo (40) */
    char region[16];                /* Country Support (16) */
} ROMHeader;

extern const ROMHeader rom_header;

// size of text segment --> start of initialized data (RO)
extern u32 _stext;
// size of initialized data segment
extern u32 _sdata;

typedef enum
{
    IMMEDIATELY,        
    ON_VBLANK ,         
    ON_VBLANK_START     
} VBlankProcessTime;

extern VoidCallback *busErrorCB;
extern VoidCallback *addressErrorCB;
extern VoidCallback *illegalInstCB;
extern VoidCallback *zeroDivideCB;
extern VoidCallback *chkInstCB;
extern VoidCallback *trapvInstCB;
extern VoidCallback *privilegeViolationCB;
extern VoidCallback *traceCB;
extern VoidCallback *line1x1xCB;
extern VoidCallback *errorExceptionCB;
extern VoidCallback *intCB;


void SYS_assertReset();
void SYS_reset();
void SYS_hardReset();

bool SYS_doVBlankProcess();
bool SYS_doVBlankProcessEx(VBlankProcessTime processTime);

u16 SYS_getInterruptMaskLevel();
void SYS_setInterruptMaskLevel(u16 value);

u16 SYS_getAndSetInterruptMaskLevel(u16 value);

void SYS_disableInts();
void SYS_enableInts();

void SYS_setVBlankCallback(VoidCallback *CB);

void SYS_setVIntCallback(VoidCallback *CB);
void SYS_setHIntCallback(VoidCallback *CB);
void SYS_setExtIntCallback(VoidCallback *CB);

u16 SYS_isInVIntCallback();
u16 SYS_isInHIntCallback();
u16 SYS_isInExtIntCallback();
u16 SYS_isInInterrupt();

bool SYS_isInVInt();

void SYS_setVIntAligned(bool value);
bool SYS_isVIntAligned();

u16 SYS_isNTSC();
u16 SYS_isPAL();

u32 SYS_getFPS();
fix32 SYS_getFPSAsFloat();
u16 SYS_getCPULoad();
void SYS_showFrameLoad(bool mean);
void SYS_hideFrameLoad();


u16 SYS_computeChecksum();
bool SYS_isChecksumOk();

void SYS_die(char *err);

#endif // _SYS_H_