peter/spectre-meltdown-checker
1
0
Fork 0
mirror of https://github.com/speed47/spectre-meltdown-checker.git synced 2026-04-07 17:23:18 +02:00
Code Issues Projects Releases Wiki Activity

fix: bsd: use proper MSR for AMD in ucode version read fallback

Browse Source
This commit is contained in:
Stéphane Lesimple
2026-04-06 00:38:39 +02:00
parent 96c696e313
commit e2eba83ce8
1 changed files with 14 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

24
src/libs/350_cpu_detect2.sh
View File

@@ -130,16 +130,20 @@ parse_cpu_details() {
if [ -z "$cpu_ucode" ] && [ "$g_os" != Linux ]; then
load_cpuid
if [ -e ${BSD_CPUCTL_DEV_BASE}0 ]; then
# init MSR with NULLs
cpucontrol -m 0x8b=0 ${BSD_CPUCTL_DEV_BASE}0
# call CPUID
cpucontrol -i 1 ${BSD_CPUCTL_DEV_BASE}0 >/dev/null
# read MSR
cpu_ucode=$(cpucontrol -m 0x8b ${BSD_CPUCTL_DEV_BASE}0 | awk '{print $3}')
# convert to decimal
cpu_ucode=$((cpu_ucode))
# convert back to hex
cpu_ucode=$(printf "0x%x" "$cpu_ucode")
if [ "$cpu_vendor" = AuthenticAMD ]; then
# AMD: read MSR_PATCHLEVEL (0xC0010058) directly
cpu_ucode=$(cpucontrol -m 0xC0010058 ${BSD_CPUCTL_DEV_BASE}0 2>/dev/null | awk '{print $3}')
elif [ "$cpu_vendor" = GenuineIntel ]; then
# Intel: write 0 to IA32_BIOS_SIGN_ID, execute CPUID, then read back
cpucontrol -m 0x8b=0 ${BSD_CPUCTL_DEV_BASE}0 2>/dev/null
cpucontrol -i 1 ${BSD_CPUCTL_DEV_BASE}0 >/dev/null 2>&1
cpu_ucode=$(cpucontrol -m 0x8b ${BSD_CPUCTL_DEV_BASE}0 2>/dev/null | awk '{print $3}')
fi
if [ -n "$cpu_ucode" ]; then
# convert to decimal then back to hex
cpu_ucode=$((cpu_ucode))
cpu_ucode=$(printf "0x%x" "$cpu_ucode")
fi
fi
fi