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oldlinux-files/docs/interrupts/int-html/rb-0044.htm
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<TITLE>Int 08
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Int 08 - CPU-generated (80286+) - DOUBLE EXCEPTION DETECTED -
Desc: called when multiple exceptions occur on one instruction, or an
exception occurs in an exception handler
Notes: called in protected mode if an interrupt above the defined limit of
the interrupt vector table occurs
return address points at beginning of instruction with errors or the
beginning of the instruction which was about to execute when the
external interrupt caused the exception
if an exception occurs in the double fault handler, the CPU goes into
SHUTDOWN mode (which circuitry in the PC/AT converts to a reset);
this triple fault is a faster way of returning to real mode on
">
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<h2>Int 08
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<h3><font color=#C00040>CPU-generated (80286+) - DOUBLE EXCEPTION DETECTED</font></h3>
<p><b>Desc:</b>
Called when multiple exceptions occur on one instruction, or an
exception occurs in an exception handler
<p><b>Notes:</b>
Called in protected mode if an interrupt above the defined limit of
the interrupt vector table occurs.
Return address points at beginning of instruction with errors or the
beginning of the instruction which was about to execute when the
external interrupt caused the exception.
If an exception occurs in the double fault handler, the CPU goes into
SHUTDOWN mode (which circuitry in the PC/AT converts to a reset);
this "triple fault" is a faster way of returning to real mode on
many 80286 machines than the standard keyboard controller reset
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