[PATCH v3 08/17] x86/apic: add modern APIC support for Hygon

[Pu Wen]

Hygon processors use modern APIC, so just return in modern_apic() and
sync_Arb_IDs(). And should break in switch case in detect_init_API().

When running on 32 bit mode, should set bigsmp if there are more than
8 cores.

Signed-off-by: Pu Wen <pu...@hygon.cn>
---
 arch/x86/kernel/apic/apic.c     | 19 ++++++++++++++-----
 arch/x86/kernel/apic/probe_32.c |  1 +
 2 files changed, 15 insertions(+), 5 deletions(-)

diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index adbda58..0ddb4e2 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -219,10 +219,15 @@ static inline int lapic_is_integrated(void)
  */
 static int modern_apic(void)
 {
-       /* AMD systems use old APIC versions, so check the CPU */
-       if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
-           boot_cpu_data.x86 >= 0xf)
+       /*
+        * Old AMD systems use old APIC versions, newer AMD systems
+        * and Hygon systems use modern APIC, so check the CPU
+        */
+       if ((boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
+            boot_cpu_data.x86 >= 0xf) ||
+            boot_cpu_data.x86_vendor == X86_VENDOR_HYGON)
                return 1;
+
        return lapic_get_version() >= 0x14;
 }
 
@@ -1210,9 +1215,11 @@ void __init sync_Arb_IDs(void)
 {
        /*
         * Unsupported on P4 - see Intel Dev. Manual Vol. 3, Ch. 8.6.1 And not
-        * needed on AMD.
+        * needed on AMD or Hygon.
         */
-       if (modern_apic() || boot_cpu_data.x86_vendor == X86_VENDOR_AMD)
+       if (modern_apic() ||
+           boot_cpu_data.x86_vendor == X86_VENDOR_AMD ||
+           boot_cpu_data.x86_vendor == X86_VENDOR_HYGON)
                return;
 
        /*
@@ -1911,6 +1918,8 @@ static int __init detect_init_APIC(void)
                    (boot_cpu_data.x86 >= 15))
                        break;
                goto no_apic;
+       case X86_VENDOR_HYGON:
+               break;
        case X86_VENDOR_INTEL:
                if (boot_cpu_data.x86 == 6 || boot_cpu_data.x86 == 15 ||
                    (boot_cpu_data.x86 == 5 && boot_cpu_has(X86_FEATURE_APIC)))
diff --git a/arch/x86/kernel/apic/probe_32.c b/arch/x86/kernel/apic/probe_32.c
index 02e8acb..47ff297 100644
--- a/arch/x86/kernel/apic/probe_32.c
+++ b/arch/x86/kernel/apic/probe_32.c
@@ -185,6 +185,7 @@ void __init default_setup_apic_routing(void)
                                break;
                        }
                        /* If P4 and above fall through */
+               case X86_VENDOR_HYGON:
                case X86_VENDOR_AMD:
                        def_to_bigsmp = 1;
                }
-- 
2.7.4