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update interrupts/interrupts-5

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spacewander 2016-01-12 19:17:56 +08:00
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interrupts/interrupts-5.md
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@ -62,7 +62,7 @@ native_irq_return_iret:
iretq
```
More about the `idtentry` macro you can read in the thirt part of the [http://0xax.gitbooks.io/linux-insides/content/interrupts/interrupts-3.html](http://0xax.gitbooks.io/linux-insides/content/interrupts/interrupts-3.html) chapter. Ok, now we saw the preparation before an exception handler will be executed and now time to look on the handlers. First of all let's look on the following handlers:
More about the `idtentry` macro you can read in the third part of the [http://0xax.gitbooks.io/linux-insides/content/interrupts/interrupts-3.html](http://0xax.gitbooks.io/linux-insides/content/interrupts/interrupts-3.html) chapter. Ok, now we saw the preparation before an exception handler will be executed and now time to look on the handlers. First of all let's look on the following handlers:
* divide_error
* overflow
@ -192,7 +192,7 @@ static ATOMIC_NOTIFIER_HEAD(die_chain);
return atomic_notifier_call_chain(&die_chain, val, &args);
```
which just expands to the `atomit_notifier_head` structure that contains lock and `notifier_block`:
which just expands to the `atomic_notifier_head` structure that contains lock and `notifier_block`:
```C
struct atomic_notifier_head {
@ -211,7 +211,7 @@ static inline void conditional_sti(struct pt_regs *regs)
}
```
more about `local_irq_enable` macro you can read in the second [part](http://0xax.gitbooks.io/linux-insides/content/interrupts/interrupts-2.html) of this chapter. The next and last call in the `do_error_trap` is the `do_trap` function. First of all the `do_trap` function defined the `tsk` variable which has `trak_struct` type and represents the current interrupted process. After the definition of the `tsk`, we can see the call of the `do_trap_no_signal` function:
more about `local_irq_enable` macro you can read in the second [part](http://0xax.gitbooks.io/linux-insides/content/interrupts/interrupts-2.html) of this chapter. The next and last call in the `do_error_trap` is the `do_trap` function. First of all the `do_trap` function defined the `tsk` variable which has `task_struct` type and represents the current interrupted process. After the definition of the `tsk`, we can see the call of the `do_trap_no_signal` function:
```C
struct task_struct *tsk = current;
@ -280,7 +280,7 @@ This is the end of the `do_trap`. We just saw generic implementation for eight d
Double fault
--------------------------------------------------------------------------------
The next exception is `#DF` or `Double fault`. This exception occurrs when the processor detected a second exception while calling an exception handler for a prior exception. We set the trap gate for this exception in the previous part:
The next exception is `#DF` or `Double fault`. This exception occurs when the processor detected a second exception while calling an exception handler for a prior exception. We set the trap gate for this exception in the previous part:
```C
set_intr_gate_ist(X86_TRAP_DF, &double_fault, DOUBLEFAULT_STACK);