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https://github.com/ekeeke/Genesis-Plus-GX.git
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67 lines
3.0 KiB
C
67 lines
3.0 KiB
C
/*******************************************************************************
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* *
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* Define size independent data types and operations. *
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* *
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* The following types must be supported by all platforms: *
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* *
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* UINT8 - Unsigned 8-bit Integer INT8 - Signed 8-bit integer *
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* UINT16 - Unsigned 16-bit Integer INT16 - Signed 16-bit integer *
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* UINT32 - Unsigned 32-bit Integer INT32 - Signed 32-bit integer *
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* UINT64 - Unsigned 64-bit Integer INT64 - Signed 64-bit integer *
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* *
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* *
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* The macro names for the artithmatic operations are composed as follows: *
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* *
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* XXX_R_A_B, where XXX - 3 letter operation code (ADD, SUB, etc.) *
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* R - The type of the result *
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* A - The type of operand 1 *
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* B - The type of operand 2 (if binary operation) *
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* *
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* Each type is one of: U8,8,U16,16,U32,32,U64,64 *
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* *
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*******************************************************************************/
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#ifndef OSD_CPU_H
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#define OSD_CPU_H
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#ifndef NGC
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#ifndef DOS
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#include "basetsd.h"
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#endif
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#undef TRUE
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#undef FALSE
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#define TRUE 1
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#define FALSE 0
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#endif
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typedef unsigned char UINT8;
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typedef unsigned short UINT16;
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typedef unsigned int UINT32;
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__extension__ typedef unsigned long long UINT64;
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typedef signed char INT8;
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typedef signed short INT16;
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typedef signed int INT32;
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__extension__ typedef signed long long INT64;
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/******************************************************************************
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* Union of UINT8, UINT16 and UINT32 in native endianess of the target
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* This is used to access bytes and words in a machine independent manner.
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* The upper bytes h2 and h3 normally contain zero (16 bit CPU cores)
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* thus PAIR.d can be used to pass arguments to the memory system
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* which expects 'int' really.
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******************************************************************************/
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typedef union {
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#ifdef LSB_FIRST
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struct { UINT8 l,h,h2,h3; } b;
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struct { UINT16 l,h; } w;
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#else
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struct { UINT8 h3,h2,h,l; } b;
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struct { UINT16 h,l; } w;
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#endif
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UINT32 d;
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} PAIR;
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#endif /* defined OSD_CPU_H */
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