Commit 00b324ae authored by LeoLiu-oc's avatar LeoLiu-oc Committed by Zheng Zengkai
Browse files

Get locgical processors numbers bits per package 

zhaoxin inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I40QDN


CVE: NA

----------------------------------------------------------------

Get locgical processors numbers bits per package by cpuid instruction
for some Zhaoxin CPUs which vendor is Centaur

Signed-off-by: default avatarLeoLiu-oc <LeoLiu-oc@zhaoxin.com>
Signed-off-by: default avatarZheng Zengkai <zhengzengkai@huawei.com>
Reviewed-by: default avatarHanjun Guo <guohanjun@huawei.com>
Signed-off-by: default avatarZheng Zengkai <zhengzengkai@huawei.com>
parent bc45d070

arch/x86/kernel/cpu/centaur.c

+13 −0
Original line number Diff line number Diff line
@@ -109,6 +109,19 @@ static void early_init_centaur(struct cpuinfo_x86 *c) 
		set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);

		set_cpu_cap(c, X86_FEATURE_NONSTOP_TSC);

	}



	if (c->cpuid_level >= 0x00000001) {

		u32 eax, ebx, ecx, edx;



		cpuid(0x00000001, &eax, &ebx, &ecx, &edx);

		/*

		 * If HTT (EDX[28]) is set EBX[16:23] contain the number of

		 * apicids which are reserved per package. Store the resulting

		 * shift value for the package management code.

		 */

		if (edx & (1U << 28))

			c->x86_coreid_bits = get_count_order((ebx >> 16) & 0xff);

	}

}



static void init_centaur(struct cpuinfo_x86 *c)