C166: Generating a Call to an Absolute Memory Location

Information in this article applies to:

• C166 Version 4.20 and later

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: Thursday, February 25, 2021