[PATCH 1/3] x86: Add CPU Vendor ID detection support for Zhaoxin processors

[MayShao <MayShao at zhaoxin dot com>]

To recognize Zhaoxin CPU Vendor ID, add a new architecture
type arch_kind_zhaoxin for Vendor Zhaoxin detection.

Checked on x86_64-linux-gnu.

Signed-off-by: MayShao <MayShao@zhaoxin.com>
---
 sysdeps/x86/cpu-features.c | 59 ++++++++++++++++++++++++++++++++++++++++++++++
 sysdeps/x86/cpu-features.h |  1 +
 2 files changed, 60 insertions(+)

diff --git a/sysdeps/x86/cpu-features.c b/sysdeps/x86/cpu-features.c
index 4bab154..9174c9d 100644
--- a/sysdeps/x86/cpu-features.c
+++ b/sysdeps/x86/cpu-features.c
@@ -466,6 +466,65 @@ init_cpu_features (struct cpu_features *cpu_features)
          }
        }
     }
+  /* This spells out "CentaurHauls" or " Shanghai ".  */
+  else if ((ebx == 0x746e6543 && ecx == 0x736c7561 && edx == 0x48727561)
+          || (ebx == 0x68532020 && ecx == 0x20206961 && edx == 0x68676e61))
+    {
+      unsigned int extended_model;
+
+      kind = arch_kind_zhaoxin;
+
+      get_common_indices (cpu_features, &family, &model, &extended_model,
+                         &stepping);
+
+      get_extended_indices (cpu_features);
+
+
+      if (family == 0x6)
+           {
+             model += extended_model;
+             if (model == 0xf || model == 0x19)
+               {
+                 cpu_features->feature[index_arch_AVX_Usable]
+                   &= (~bit_arch_AVX_Usable
+                   & ~bit_arch_AVX2_Usable);
+
+                 cpu_features->feature[index_arch_Slow_SSE4_2]
+                   |= (bit_arch_Slow_SSE4_2
+                   | bit_arch_Prefer_MAP_32BIT_EXEC);
+
+                 cpu_features->feature[index_arch_AVX_Fast_Unaligned_Load]
+                   &= ~bit_arch_AVX_Fast_Unaligned_Load;
+               }
+           }
+
+      if (family == 0x7)
+           {
+             model += extended_model;
+             if (model == 0x1b)
+               {
+                 cpu_features->feature[index_arch_AVX_Usable]
+                   &= (~bit_arch_AVX_Usable
+                   & ~bit_arch_AVX2_Usable);
+
+                cpu_features->feature[index_arch_Slow_SSE4_2]
+                  |= bit_arch_Slow_SSE4_2;
+
+                cpu_features->feature[index_arch_AVX_Fast_Unaligned_Load]
+                  &= ~bit_arch_AVX_Fast_Unaligned_Load;
+              }
+
+            if (model == 0x3b)
+              {
+                cpu_features->feature[index_arch_AVX_Usable]
+                  &= (~bit_arch_AVX_Usable
+                  & ~bit_arch_AVX2_Usable);
+
+                cpu_features->feature[index_arch_AVX_Fast_Unaligned_Load]
+                  &= ~bit_arch_AVX_Fast_Unaligned_Load;
+              }
+          }
+    }
   else
     {
       kind = arch_kind_other;
diff --git a/sysdeps/x86/cpu-features.h b/sysdeps/x86/cpu-features.h
index 03a9b2a..cab55ef 100644
--- a/sysdeps/x86/cpu-features.h
+++ b/sysdeps/x86/cpu-features.h
@@ -53,6 +53,7 @@ enum cpu_features_kind
   arch_kind_unknown = 0,
   arch_kind_intel,
   arch_kind_amd,
+  arch_kind_zhaoxin,
   arch_kind_other
 };

--
2.7.4



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