On 21-01-08 07:23, jidong xiao wrote:

quoted text
>   I know there is set_intr_gate(n,addr) which is used to insert an
> interrupt gate in the n th IDT entry. But I don't know what the usage
> of set_intr_gate_ist()?

The same, while setting the "Interrupt STack" field of the descriptor to 
"ist". This field is a 64-bit only field, implementing a hardware stack 
switch. Look for it in the AMD64 docs.

Rene.
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