arno/linux-insides
1
0
Fork 0
mirror of https://github.com/0xAX/linux-insides.git synced 2024-12-22 06:38:07 +00:00
Code Issues Releases Wiki Activity

Merge pull request #768 from kssaril/master

Browse Source 
Update linux-interrupts-1.md
This commit is contained in:
Sebastian Fricke 2021-02-27 08:28:31 +01:00 committed by GitHub
commit 9abab6685d
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
Interrupts/linux-interrupts-1.md
View File

@ -37,7 +37,7 @@ Addresses of each of the interrupt handlers are maintained in a special location
BUG_ON((unsigned)n > 0xFF);
```
You can find this check within the Linux kernel source code related to interrupt setup (e.g. The `set_intr_gate` in [arch/x86/kernel/idt.c](https://github.com/torvalds/linux/blob/16f73eb02d7e1765ccab3d2018e0bd98eb93d973/arch/x86/kernel/ldt.c)). The first 32 vector numbers from `0` to `31` are reserved by the processor and used for the processing of architecture-defined exceptions and interrupts. You can find the table with the description of these vector numbers in the second part of the Linux kernel initialization process - [Early interrupt and exception handling](https://0xax.gitbook.io/linux-insides/summary/initialization/linux-initialization-2). Vector numbers from `32` to `255` are designated as user-defined interrupts and are not reserved by the processor. These interrupts are generally assigned to external I/O devices to enable those devices to send interrupts to the processor.
You can find this check within the Linux kernel source code related to interrupt setup (e.g. The `set_intr_gate` in [arch/x86/kernel/idt.c](https://github.com/torvalds/linux/blob/master/arch/x86/kernel/idt.c)). The first 32 vector numbers from `0` to `31` are reserved by the processor and used for the processing of architecture-defined exceptions and interrupts. You can find the table with the description of these vector numbers in the second part of the Linux kernel initialization process - [Early interrupt and exception handling](https://0xax.gitbook.io/linux-insides/summary/initialization/linux-initialization-2). Vector numbers from `32` to `255` are designated as user-defined interrupts and are not reserved by the processor. These interrupts are generally assigned to external I/O devices to enable those devices to send interrupts to the processor.
Now let's talk about the types of interrupts. Broadly speaking, we can split interrupts into 2 major classes: