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chore: add comment about is_intel/amd/hygon recursion

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Stéphane Lesimple
2026-04-06 13:46:11 +02:00
parent 7f893e17d2
commit 730dd50024
1 changed files with 5 additions and 2 deletions
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7
src/libs/350_cpu_detect2.sh
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@@ -65,6 +65,7 @@ parse_cpu_details() {
# see https://elixir.bootlin.com/linux/v6.0/source/arch/x86/kernel/cpu/microcode/intel.c#L694
# Set it to 8 (impossible value as it is 3 bit long) by default
cpu_platformid=8
# use direct cpu_vendor comparison: is_intel() calls parse_cpu_details() which would recurse
if [ "$cpu_vendor" = GenuineIntel ] && [ "$cpu_model" -ge 5 ]; then
read_msr $MSR_IA32_PLATFORM_ID
ret=$?
@@ -119,7 +120,8 @@ parse_cpu_details() {
# Detect hybrid CPU: CPUID.(EAX=7,ECX=0):EDX[15] = 1 means hybrid
cpu_hybrid=0
if is_intel; then
# use direct cpu_vendor comparison: is_intel() calls parse_cpu_details() which would recurse
if [ "$cpu_vendor" = GenuineIntel ]; then
read_cpuid 0x7 0x0 $EDX 15 1 1
if [ $? = $READ_CPUID_RET_OK ]; then
cpu_hybrid=1
@@ -146,7 +148,8 @@ parse_cpu_details() {
if [ -z "$cpu_ucode" ] && [ "$g_os" != Linux ]; then
load_cpuid
if [ -e ${BSD_CPUCTL_DEV_BASE}0 ]; then
if [ "$cpu_vendor" = AuthenticAMD ]; then
# use direct cpu_vendor comparison: is_amd/is_hygon/is_intel() call parse_cpu_details() which would recurse
if [ "$cpu_vendor" = AuthenticAMD ] || [ "$cpu_vendor" = HygonGenuine ]; 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