From mboxrd@z Thu Jan 1 00:00:00 1970 From: Daniel Kiper Subject: [PATCH v2 03/23] x86: zero BSS using stosl instead of stosb Date: Mon, 20 Jul 2015 16:28:58 +0200 Message-ID: <1437402558-7313-4-git-send-email-daniel.kiper__49995.8227076151$1437402710$gmane$org@oracle.com> References: <1437402558-7313-1-git-send-email-daniel.kiper@oracle.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from mail6.bemta5.messagelabs.com ([195.245.231.135]) by lists.xen.org with esmtp (Exim 4.72) (envelope-from ) id 1ZHC52-0005iC-JC for xen-devel@lists.xenproject.org; Mon, 20 Jul 2015 14:30:08 +0000 In-Reply-To: <1437402558-7313-1-git-send-email-daniel.kiper@oracle.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: xen-devel@lists.xenproject.org, grub-devel@gnu.org Cc: jgross@suse.com, keir@xen.org, ian.campbell@citrix.com, andrew.cooper3@citrix.com, stefano.stabellini@eu.citrix.com, roy.franz@linaro.org, ning.sun@intel.com, david.vrabel@citrix.com, jbeulich@suse.com, phcoder@gmail.com, wei.liu2@citrix.com, qiaowei.ren@intel.com, richard.l.maliszewski@intel.com, gang.wei@intel.com, fu.wei@linaro.org List-Id: xen-devel@lists.xenproject.org Additionally, align relevant comment to coding style. Suggested-by: Andrew Cooper Signed-off-by: Daniel Kiper --- xen/arch/x86/boot/head.S | 5 +++-- xen/arch/x86/xen.lds.S | 2 ++ 2 files changed, 5 insertions(+), 2 deletions(-) diff --git a/xen/arch/x86/boot/head.S b/xen/arch/x86/boot/head.S index f63b349..ed42782 100644 --- a/xen/arch/x86/boot/head.S +++ b/xen/arch/x86/boot/head.S @@ -123,12 +123,13 @@ __start: call reloc mov %eax,sym_phys(multiboot_ptr) - /* Initialize BSS (no nasty surprises!) */ + /* Initialize BSS (no nasty surprises!). */ mov $sym_phys(__bss_start),%edi mov $sym_phys(__bss_end),%ecx sub %edi,%ecx + shr $2,%ecx xor %eax,%eax - rep stosb + rep stosl /* Interrogate CPU extended features via CPUID. */ mov $0x80000000,%eax diff --git a/xen/arch/x86/xen.lds.S b/xen/arch/x86/xen.lds.S index 6553cff..3e1f2af 100644 --- a/xen/arch/x86/xen.lds.S +++ b/xen/arch/x86/xen.lds.S @@ -162,6 +162,7 @@ SECTIONS . = ALIGN(STACK_SIZE); __init_end = .; + . = ALIGN(4); .bss : { /* BSS */ __bss_start = .; *(.bss.stack_aligned) @@ -175,6 +176,7 @@ SECTIONS *(.bss.percpu.read_mostly) . = ALIGN(SMP_CACHE_BYTES); __per_cpu_data_end = .; + . = ALIGN(4); __bss_end = .; } :text _end = . ; -- 1.7.10.4