From ade8b817fead73b302d08c88cd44ea2ea56793d4 Mon Sep 17 00:00:00 2001 From: Carlos O'Donell Date: Wed, 12 Dec 2018 09:24:17 -0500 Subject: x86: Add Hygon Dhyana support. This patch fix Hygon Dhyana processor CPU Vendor ID detection problem in glibc sysdep module, current glibc codes doesn't recognize Dhyana CPU Vendor ID("HygonGenuine") and set kind to arch_kind_other, which result to incorrect zero value for __cache_sysconf() syscall. As Hygon Dhyana share most architecture feature as AMD Family 17h, this patch add Hygon CPU Vendor ID check and setup kind to arch_kind_amd and reuse AMD code path, which lead to correct return value in __cache_sysconf() syscall. we run the glibc test suite for both Hygon Dhyana and AMD EPYC and found no failure case. Background: Chengdu Haiguang IC Design Co., Ltd (Hygon) is a Joint Venture between AMD and Haiguang Information Technology Co.,Ltd., aims at providing high performance x86 processor for China server market. Its first generation processor codename is Dhyana, which originates from AMD technology and shares most of the architecture with AMD's family 17h, but with different CPU Vendor ID("HygonGenuine")/Family series number(Family 18h). Related Hygon kernel patch can be found on http://lkml.kernel.org/r/5ce86123a7b9dad925ac583d88d2f921040e859b.1538583282.git.puwen@hygon.cn Signed-off-by: fanjinke Reviewed-by: Carlos O'Donell --- sysdeps/x86/cpu-features.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) (limited to 'sysdeps') diff --git a/sysdeps/x86/cpu-features.c b/sysdeps/x86/cpu-features.c index 5f9eefd408..af7ac4bb4e 100644 --- a/sysdeps/x86/cpu-features.c +++ b/sysdeps/x86/cpu-features.c @@ -425,8 +425,9 @@ init_cpu_features (struct cpu_features *cpu_features) cpu_features->feature[index_arch_Prefer_No_AVX512] |= bit_arch_Prefer_No_AVX512; } - /* This spells out "AuthenticAMD". */ - else if (ebx == 0x68747541 && ecx == 0x444d4163 && edx == 0x69746e65) + /* This spells out "AuthenticAMD" or "HygonGenuine". */ + else if ((ebx == 0x68747541 && ecx == 0x444d4163 && edx == 0x69746e65) + || (ebx == 0x6f677948 && ecx == 0x656e6975 && edx == 0x6e65476e)) { unsigned int extended_model; -- cgit 1.4.1