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[2620:137:e000::1:20]) by mx.google.com with ESMTP id s8-20020a170902ea0800b001bdc664cd5fsi4543785plg.168.2023.08.14.02.39.08; Mon, 14 Aug 2023 02:39:21 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@linutronix.de header.s=2020 header.b=XplJFTXN; dkim=neutral (no key) header.i=@linutronix.de header.s=2020e header.b=O55RXWI5; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=linutronix.de Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235408AbjHNIzl (ORCPT + 99 others); Mon, 14 Aug 2023 04:55:41 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47656 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234445AbjHNIyM (ORCPT ); Mon, 14 Aug 2023 04:54:12 -0400 Received: from galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E42BF10B for ; Mon, 14 Aug 2023 01:54:11 -0700 (PDT) Message-ID: <20230814085113.411614522@linutronix.de> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1692003250; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: references:references; bh=XFu1uEQMDTgWTl5t42BMgLcsBElydD0EUbS0RHt1IKs=; b=XplJFTXNGfBaO6PFFHungwhGIvlRKMSOMb03RDfAQLUwt5SsrLY00NNv73oh6gJV6rNFIt rX0JzWimAdOIpXFglcvvg/7lpw8ELxv0dAc9i6Koebwc8RcQc1TgnuNo1t/DVRqUAwAK0X SGMdSs4Glf7YLgo23f3WSkj20PwzrPtHmgtph7p6JekbBfLa9EfXXtVgWxg2/nxNn97sKK 5saC5dCASwh9ZXdZwSCvWwos3wU1Y1uxBwzwyzF1cRnSJX66kLuDe5/JfILOrhyUaxNWD9 2w7JblcxEsNRkoG38DgcFZ0ztzMdLrAUxA5GzjMMN/X8FSZkZCRKLTM5DejKmg== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1692003250; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: references:references; bh=XFu1uEQMDTgWTl5t42BMgLcsBElydD0EUbS0RHt1IKs=; b=O55RXWI5qQ1Z624gMZ104IUccXphm975qWRTv846R4JKAHB61LDqPHJohRfykt/A2YKM5l TbeVpeJbZfXdafCw== From: Thomas Gleixner To: LKML Cc: x86@kernel.org, Tom Lendacky , Andrew Cooper , Arjan van de Ven , Huang Rui , Juergen Gross , Dimitri Sivanich , Michael Kelley , Wei Liu , Pu Wen , Qiuxu Zhuo , Sohil Mehta Subject: [patch V4 23/41] x86/cpu: Provide cpuid_read() et al. References: <20230814085006.593997112@linutronix.de> MIME-Version: 1.0 Date: Mon, 14 Aug 2023 10:54:10 +0200 (CEST) X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_BLOCKED, SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1774196843044552882 X-GMAIL-MSGID: 1774196843044552882 Provide a few helper functions to read CPUID leafs or individual registers into a data structure without requiring unions. Signed-off-by: Thomas Gleixner Tested-by: Juergen Gross Tested-by: Sohil Mehta Tested-by: Michael Kelley --- arch/x86/include/asm/cpuid.h | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) --- a/arch/x86/include/asm/cpuid.h +++ b/arch/x86/include/asm/cpuid.h @@ -127,6 +127,42 @@ static inline unsigned int cpuid_edx(uns return edx; } +static inline void __cpuid_read(unsigned int leaf, unsigned int subleaf, u32 *regs) +{ + regs[CPUID_EAX] = leaf; + regs[CPUID_ECX] = subleaf; + __cpuid(regs, regs + 1, regs + 2, regs + 3); +} + +#define cpuid_subleaf(leaf, subleaf, regs) { \ + BUILD_BUG_ON(sizeof(*(regs)) != 16); \ + __cpuid_read(leaf, subleaf, (u32 *)(regs)); \ +} + +#define cpuid_leaf(leaf, regs) { \ + BUILD_BUG_ON(sizeof(*(regs)) != 16); \ + __cpuid_read(leaf, 0, (u32 *)(regs)); \ +} + +static inline void __cpuid_read_reg(unsigned int leaf, unsigned int subleaf, + enum cpuid_regs_idx regidx, u32 *reg) +{ + u32 regs[4]; + + __cpuid_read(leaf, subleaf, regs); + *reg = regs[regidx]; +} + +#define cpuid_subleaf_reg(leaf, subleaf, regidx, reg) { \ + BUILD_BUG_ON(sizeof(*(reg)) != 4); \ + __cpuid_read_reg(leaf, subleaf, regidx, (u32 *)(reg)); \ +} + +#define cpuid_leaf_reg(leaf, regidx, reg) { \ + BUILD_BUG_ON(sizeof(*(reg)) != 4); \ + __cpuid_read_reg(leaf, 0, regidx, (u32 *)(reg)); \ +} + static __always_inline bool cpuid_function_is_indexed(u32 function) { switch (function) {