RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-05-31 07:08:10 +00:00
Code Issues Activity Actions

Kernel: Use the GS segment for the per-CPU struct

Browse source 
Right now we're using the FS segment for our per-CPU struct. On x86_64
there's an instruction to switch between a kernel and usermode GS
segment (swapgs) which we could use.

This patch doesn't update the rest of the code to use swapgs but it
prepares for that by using the GS segment instead of the FS segment.
This commit is contained in:
Gunnar Beutner 2021-07-02 14:02:36 +02:00 • committed by Andreas Kling
parent 42d197cde7
commit 52f9aaa823
8 changed files with 36 additions and 36 deletions
Download patch file Download diff file Expand all files Collapse all files

4
Kernel/Thread.cpp
View file

@ -102,9 +102,9 @@ Thread::Thread(NonnullRefPtr<Process> process, NonnullOwnPtr<Region> kernel_stac
m_regs.cs = GDT_SELECTOR_CODE0;
m_regs.ds = GDT_SELECTOR_DATA0;
m_regs.es = GDT_SELECTOR_DATA0;
m_regs.fs = GDT_SELECTOR_PROC;
m_regs.fs = 0;
m_regs.ss = GDT_SELECTOR_DATA0;
m_regs.gs = 0;
m_regs.gs = GDT_SELECTOR_PROC;
} else {
m_regs.cs = GDT_SELECTOR_CODE3 | 3;
m_regs.ds = GDT_SELECTOR_DATA3 | 3;