I Can't Get Interrupts Working: Difference between revisions
Jump to navigation
Jump to search
| [unchecked revision] | [unchecked revision] |
Content deleted Content added
| Line 22: | Line 22: | ||
=== My handler is called but it doesn't return !? === |
=== My handler is called but it doesn't return !? === |
||
Try to run it in the |
Try to run it in the Bochs and see if you get any exception report. Program all your exception to have the same kind of behavior as [[#Assembly_Example|the example]], but displaying a character indicating the fault. Exceptions occurring at the end of an interrupt handler are usually due to a wrong stack operation within the handler. |
||
* don't try to return from an exception (unless you solved its cause). Returning from a division by zero, for instance, makes no sense at all |
* don't try to return from an exception (unless you solved its cause). Returning from a division by zero, for instance, makes no sense at all |
||
| Line 29: | Line 29: | ||
* make sure your handler doesn't trash unexpected registers. For exceptions and hardware IRQ handlers, no registers *at all* should be modified. |
* make sure your handler doesn't trash unexpected registers. For exceptions and hardware IRQ handlers, no registers *at all* should be modified. |
||
Another common source of error at this point comes from |
Another common source of error at this point comes from mis implementation of ISR in C. Check the InterruptServiceRoutines page for enlightenment ... |
||
== IRQ problems == |
== IRQ problems == |
||