diff options
Diffstat (limited to 'arch/i386/kernel/apic.c')
| -rw-r--r-- | arch/i386/kernel/apic.c | 23 |
1 files changed, 16 insertions, 7 deletions
diff --git a/arch/i386/kernel/apic.c b/arch/i386/kernel/apic.c index 6273bf74c20..254cee9f0b7 100644 --- a/arch/i386/kernel/apic.c +++ b/arch/i386/kernel/apic.c @@ -62,6 +62,18 @@ int apic_verbosity; static void apic_pm_activate(void); +int modern_apic(void) +{ + unsigned int lvr, version; + /* AMD systems use old APIC versions, so check the CPU */ + if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD && + boot_cpu_data.x86 >= 0xf) + return 1; + lvr = apic_read(APIC_LVR); + version = GET_APIC_VERSION(lvr); + return version >= 0x14; +} + /* * 'what should we do if we get a hw irq event on an illegal vector'. * each architecture has to answer this themselves. @@ -119,10 +131,7 @@ void enable_NMI_through_LVT0 (void * dummy) int get_physical_broadcast(void) { - unsigned int lvr, version; - lvr = apic_read(APIC_LVR); - version = GET_APIC_VERSION(lvr); - if (!APIC_INTEGRATED(version) || version >= 0x14) + if (modern_apic()) return 0xff; else return 0xf; @@ -349,9 +358,9 @@ int __init verify_local_APIC(void) void __init sync_Arb_IDs(void) { - /* Unsupported on P4 - see Intel Dev. Manual Vol. 3, Ch. 8.6.1 */ - unsigned int ver = GET_APIC_VERSION(apic_read(APIC_LVR)); - if (ver >= 0x14) /* P4 or higher */ + /* Unsupported on P4 - see Intel Dev. Manual Vol. 3, Ch. 8.6.1 + And not needed on AMD */ + if (modern_apic()) return; /* * Wait for idle. |