C166: GENERATING A CALL TO AN ABSOLUTE MEMORY LOCATION

Information in this article applies to:

• C166 Version 4.20

QUESTION

I need to call a routine at address 0x100000. Is there a way to do this in C?

ANSWER

Yes. The following statement generates call to a function at address 0x100000.

((void (far *) (void)) 0x100000) ();

The function called is a far function and must return with a RETS instruction. In the SMALL and COMPACT memory models, you must declare this function as a far function. For example:

void far func (void)  {
  // your code goes here
}

SEE ALSO

• C166: CHANGING THE LOCATION OF THE RESET VECTOR
• C166: INTERRUPT VECTOR REDIRECTION
• C166: LOCATE VARIABLES TO ABSOLUTE ADDRESSES
• C166: LOCATE CONSTANTS TO ABSOLUTE ADDRESSES

Last Reviewed: Tuesday, June 26, 2007