From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S967476Ab0GTBwI (ORCPT ); Mon, 19 Jul 2010 21:52:08 -0400 Received: from hera.kernel.org ([140.211.167.34]:44386 "EHLO hera.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S967380Ab0GTBwE (ORCPT ); Mon, 19 Jul 2010 21:52:04 -0400 Date: Tue, 20 Jul 2010 01:51:45 GMT From: tip-bot for Suresh Siddha Cc: linux-kernel@vger.kernel.org, hpa@zytor.com, mingo@redhat.com, suresh.b.siddha@intel.com, tglx@linutronix.de, hpa@linux.intel.com Reply-To: mingo@redhat.com, hpa@zytor.com, linux-kernel@vger.kernel.org, suresh.b.siddha@intel.com, tglx@linutronix.de, hpa@linux.intel.com In-Reply-To: <20100719230205.262987929@sbs-t61.sc.intel.com> References: <20100719230205.262987929@sbs-t61.sc.intel.com> To: linux-tip-commits@vger.kernel.org Subject: [tip:x86/xsave] x86, xsave: Track the offset, size of state in the xsave layout Message-ID: Git-Commit-ID: a1488f8bf4d72ad724700f6e982469a1240e4264 X-Mailer: tip-git-log-daemon MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.2.3 (hera.kernel.org [127.0.0.1]); Tue, 20 Jul 2010 01:51:45 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: a1488f8bf4d72ad724700f6e982469a1240e4264 Gitweb: http://git.kernel.org/tip/a1488f8bf4d72ad724700f6e982469a1240e4264 Author: Suresh Siddha AuthorDate: Mon, 19 Jul 2010 16:05:48 -0700 Committer: H. Peter Anvin CommitDate: Mon, 19 Jul 2010 17:51:17 -0700 x86, xsave: Track the offset, size of state in the xsave layout Subleaves of the cpuid vector 0xd provides the offset and size of different feature state that are managed by the xsave/xrstor. Track this for the upcoming usage during signal handling. Signed-off-by: Suresh Siddha LKML-Reference: <20100719230205.262987929@sbs-t61.sc.intel.com> Signed-off-by: H. Peter Anvin --- arch/x86/kernel/xsave.c | 29 +++++++++++++++++++++++++++++ 1 files changed, 29 insertions(+), 0 deletions(-) diff --git a/arch/x86/kernel/xsave.c b/arch/x86/kernel/xsave.c index 9801498..4993caa 100644 --- a/arch/x86/kernel/xsave.c +++ b/arch/x86/kernel/xsave.c @@ -21,6 +21,8 @@ struct _fpx_sw_bytes fx_sw_reserved; struct _fpx_sw_bytes fx_sw_reserved_ia32; #endif +static unsigned int *xstate_offsets, *xstate_sizes, xstate_features; + /* * Check for the presence of extended state information in the * user fpstate pointer in the sigcontext. @@ -302,12 +304,39 @@ void __cpuinit xsave_init(void) } /* + * Record the offsets and sizes of different state managed by the xsave + * memory layout. + */ +static void setup_xstate_features(void) +{ + int eax, ebx, ecx, edx, leaf = 0x2; + + xstate_features = fls64(pcntxt_mask); + xstate_offsets = alloc_bootmem(xstate_features * sizeof(int)); + xstate_sizes = alloc_bootmem(xstate_features * sizeof(int)); + + do { + cpuid_count(0xd, leaf, &eax, &ebx, &ecx, &edx); + + if (eax == 0) + break; + + xstate_offsets[leaf] = ebx; + xstate_sizes[leaf] = eax; + + leaf++; + } while (1); +} + +/* * setup the xstate image representing the init state */ static void __init setup_xstate_init(void) { init_xstate_buf = alloc_bootmem(xstate_size); init_xstate_buf->i387.mxcsr = MXCSR_DEFAULT; + + setup_xstate_features(); } /*