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ud598.txt

Associated article: Undocumented Corner

Tags: Web Development     Parallel    

Published source code accompanying the column by Robert R. Collins in which he wraps up his discussion of Intel's Virtual Mode Extensions (VME).

					Undocumented Corner

by Robert R. Collins



Listing One

CLI {                   /* v86 mode                          */

    if (EFLAGS.IOPL == 3) {

    then EFLAGS.IF = 0;

    else if (CR4.VME == 0) {    /* IOPL < 3                  */

        then #GP(0);        /* ERROR CODE = 0                */

        else EFLAGS.VIF = 0;

        }

    }

}

STI {                   /* v86 mode                          */

    if (EFLAGS.IOPL == 3) {

    then EFLAGS.IF = 1;

    else ...
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