RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-07-25 21:27:35 +00:00
Code Issues Activity Actions

Kernel: Fix CPUID usage inside cpu_detect()

Browse source 
Since no features inside the 0x80000001 leaf are required for
SerenityOS to work, don't assert if it's unavailable.
This commit is contained in:
Jean-Baptiste Boric 2021-06-14 23:26:09 +02:00 • committed by Andreas Kling
parent fb3447f7ec
commit 8cd96f031d
1 changed files with 10 additions and 9 deletions
Download patch file Download diff file Expand all files Collapse all files

19
Kernel/Arch/i386/CPU.cpp
View file

@ -1003,15 +1003,16 @@ UNMAP_AFTER_INIT void Processor::cpu_detect()
u32 max_extended_leaf = CPUID(0x80000000).eax();
VERIFY(max_extended_leaf >= 0x80000001);
CPUID extended_processor_info(0x80000001);
if (extended_processor_info.edx() & (1 << 20))
set_feature(CPUFeature::NX);
if (extended_processor_info.edx() & (1 << 27))
set_feature(CPUFeature::RDTSCP);
if (extended_processor_info.edx() & (1 << 11)) {
// Only available in 64 bit mode
set_feature(CPUFeature::SYSCALL);
if (max_extended_leaf >= 0x80000001) {
CPUID extended_processor_info(0x80000001);
if (extended_processor_info.edx() & (1 << 20))
set_feature(CPUFeature::NX);
if (extended_processor_info.edx() & (1 << 27))
set_feature(CPUFeature::RDTSCP);
if (extended_processor_info.edx() & (1 << 11)) {
// Only available in 64 bit mode
set_feature(CPUFeature::SYSCALL);
}
}
if (max_extended_leaf >= 0x80000007) {