Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755810Ab2JPEf2 (ORCPT ); Tue, 16 Oct 2012 00:35:28 -0400 Received: from fgwmail6.fujitsu.co.jp ([192.51.44.36]:38749 "EHLO fgwmail6.fujitsu.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755792Ab2JPEf1 (ORCPT ); Tue, 16 Oct 2012 00:35:27 -0400 From: HATAYAMA Daisuke Subject: [PATCH v1 1/2] x86, apic: Introduce boot_cpu_is_bsp indicating whether boot cpu is BSP or not To: linux-kernel@vger.kernel.org, kexec@lists.infradead.org, x86@kernel.org Cc: mingo@elte.hu, tglx@linutronix.de, hpa@zytor.com, len.brown@intel.com, fenghua.yu@intel.com, vgoyal@redhat.com, ebiederm@xmission.com, grant.likely@secretlab.ca, rob.herring@calxeda.com, d.hatayama@jp.fujitsu.com Date: Tue, 16 Oct 2012 13:35:23 +0900 Message-ID: <20121016043523.20003.11838.stgit@localhost6.localdomain6> In-Reply-To: <20121016043357.20003.5885.stgit@localhost6.localdomain6> References: <20121016043357.20003.5885.stgit@localhost6.localdomain6> User-Agent: StGIT/0.14.3 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2416 Lines: 77 Part of boot-up code assumes booting CPU is BSP, but kexec can enter the 2nd kernel with AP. To be able to distinguish these throughout kernel processing, introduce boot_cpu_is_bsp. Signed-off-by: HATAYAMA Daisuke --- arch/x86/include/asm/mpspec.h | 3 +++ arch/x86/kernel/apic/apic.c | 13 +++++++++++++ arch/x86/kernel/setup.c | 2 ++ 3 files changed, 18 insertions(+), 0 deletions(-) diff --git a/arch/x86/include/asm/mpspec.h b/arch/x86/include/asm/mpspec.h index 3e2f42a..d56f253 100644 --- a/arch/x86/include/asm/mpspec.h +++ b/arch/x86/include/asm/mpspec.h @@ -47,10 +47,13 @@ extern int mp_bus_id_to_type[MAX_MP_BUSSES]; extern DECLARE_BITMAP(mp_bus_not_pci, MAX_MP_BUSSES); extern unsigned int boot_cpu_physical_apicid; +extern bool boot_cpu_is_bsp; extern unsigned int max_physical_apicid; extern int mpc_default_type; extern unsigned long mp_lapic_addr; +extern void boot_cpu_is_bsp_init(void); + #ifdef CONFIG_X86_LOCAL_APIC extern int smp_found_config; #else diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c index b17416e..d8d69e4 100644 --- a/arch/x86/kernel/apic/apic.c +++ b/arch/x86/kernel/apic/apic.c @@ -62,6 +62,10 @@ unsigned disabled_cpus __cpuinitdata; /* Processor that is doing the boot up */ unsigned int boot_cpu_physical_apicid = -1U; +/* Indicates whether the processor that is doing the boot up, is BSP + * processor or not */ +bool boot_cpu_is_bsp; + /* * The highest APIC ID seen during enumeration. */ @@ -2515,3 +2519,12 @@ static int __init lapic_insert_resource(void) * that is using request_resource */ late_initcall(lapic_insert_resource); + +void boot_cpu_is_bsp_init(void) +{ + u32 l, h; + + rdmsr(MSR_IA32_APICBASE, l, h); + + boot_cpu_is_bsp = (l & MSR_IA32_APICBASE_BSP) ? true : false; +} diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c index a2bb18e..6ecb9bc 100644 --- a/arch/x86/kernel/setup.c +++ b/arch/x86/kernel/setup.c @@ -988,6 +988,8 @@ void __init setup_arch(char **cmdline_p) early_quirks(); + boot_cpu_is_bsp_init(); + /* * Read APIC and some other early information from ACPI tables. */ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/