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fix typo (#483)

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Evan Martin
2018-10-22 10:55:40 -07:00
committed by Philipp Oppermann
parent cd44531822
commit 6465d6e68e
1 changed files with 1 additions and 1 deletions
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blog/content/second-edition/posts/08-hardware-interrupts/index.md
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@@ -223,7 +223,7 @@ extern "x86-interrupt" fn timer_interrupt_handler(
}
```
The `notify_end_of_interrupt` figures out wether the primary or secondary PIC sent the interrupt and then uses the `command` and `data` ports to send an EOI signal to respective controllers. If the secondary PIC sent the interrupt both PICs need to be notified because the secondary PIC is connected to an input line of the primary PIC.
The `notify_end_of_interrupt` figures out whether the primary or secondary PIC sent the interrupt and then uses the `command` and `data` ports to send an EOI signal to respective controllers. If the secondary PIC sent the interrupt both PICs need to be notified because the secondary PIC is connected to an input line of the primary PIC.
We need to be careful to use the correct interrupt vector number, otherwise we could accidentally delete an important unsent interrupt or cause our system to hang. This is the reason that the function is unsafe.