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kernel/x86: also write the cpu number when the rdpid instruction is available

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Change-Id: I5b37fe8aff9b4cf12fbd4dd60a91eb09f11f4e2b
Reviewed-on: https://review.haiku-os.org/c/haiku/+/6807
Reviewed-by: waddlesplash <waddlesplash@gmail.com>
This commit is contained in:
Jérôme Duval 2023-08-10 18:00:11 +02:00 committed by Adrien Destugues
parent 67ee1d1a3e
commit ef611e96c4
1 changed files with 4 additions and 2 deletions
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6
src/system/kernel/arch/x86/arch_cpu.cpp
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@ -1693,9 +1693,11 @@ arch_cpu_init_percpu(kernel_args* args, int cpu)
x86_write_cr4(x86_read_cr4() | IA32_CR4_MCE);
#ifdef __x86_64__
// if RDTSCP is available write cpu number in TSC_AUX
if (x86_check_feature(IA32_FEATURE_AMD_EXT_RDTSCP, FEATURE_EXT_AMD))
// if RDTSCP or RDPID are available write cpu number in TSC_AUX
if (x86_check_feature(IA32_FEATURE_AMD_EXT_RDTSCP, FEATURE_EXT_AMD)
|| x86_check_feature(IA32_FEATURE_RDPID, FEATURE_7_ECX)) {
x86_write_msr(IA32_MSR_TSC_AUX, cpu);
}
// make LFENCE a dispatch serializing instruction on AMD 64bit
cpu_ent* cpuEnt = get_cpu_struct();