RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-07-25 14:57:35 +00:00
Code Issues Activity Actions

Kernel: Clarify code that saves FPU state after FNINIT

Browse source 
After we clear the FPU state in a thread when it uses the FPU for the
first time, we also save the clean slate in the thread's FPU state
buffer. When we're doing that, let's write through current->fpu_state()
just to make it clear what's going on.

It was actually safe, since we'd just overwritten the g_last_fpu_thread
pointer anyway, but this patch improves the communication of intent.

Spotted by Bryan Steele, thanks!
This commit is contained in:
Andreas Kling 2019-10-13 20:39:59 +02:00
parent 3309bdf722
commit 98c7fd7aed
1 changed files with 1 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

2
Kernel/Arch/i386/CPU.cpp
View file

@ -222,7 +222,7 @@ void exception_7_handler(RegisterDump& regs)
} else {
asm volatile("fninit");
asm volatile("fxsave %0"
: "=m"(g_last_fpu_thread->fpu_state()));
: "=m"(current->fpu_state()));
current->set_has_used_fpu(true);
}