far_ptr.h

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#ifndef __FAR_PTR_H_INCLUDE
#define __FAR_PTR_H_INCLUDE
 
#define TO_FAR_PTR(ofs, seg) (((FAR_PTR)seg << 16) | (FAR_PTR)ofs)
 
#define FAR_SEG(ptr) (((union __far_ptr *)&ptr)->segofs.seg)
 
#define FAR_OFS(ptr) (((union __far_ptr *)&ptr)->segofs.ofs)
 
#define FAR_FUNC(ptr, typ) ((typ)(((union __far_ptr *)&ptr)->segfn.fn))
 
#define FAR_CALL(ptr, typ, ...) (__call_banked_ptr=ptr,((typ)(&__call__banked))(__VA_ARGS__))
 
typedef uint32_t FAR_PTR;
 
union __far_ptr {
    FAR_PTR ptr;
    struct {
        void * ofs;
        uint16_t seg;
    } segofs;
    struct {
        void (*fn)();
        uint16_t seg;
    } segfn;
};
 
extern volatile FAR_PTR __call_banked_ptr;
extern volatile void * __call_banked_addr;
extern volatile uint8_t __call_banked_bank;
 
void __call__banked();
 
int32_t to_far_ptr(void* ofs, int16_t seg);
 
#endif