From patchwork Fri Aug 23 14:15:40 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Tokarev X-Patchwork-Id: 13775289 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 42F28C52D7C for ; Fri, 23 Aug 2024 14:16:53 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1shV5F-00021S-J2; Fri, 23 Aug 2024 10:16:10 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1shV53-000207-FC; Fri, 23 Aug 2024 10:15:58 -0400 Received: from isrv.corpit.ru ([86.62.121.231]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1shV51-0004G3-I2; Fri, 23 Aug 2024 10:15:57 -0400 Received: from tsrv.corpit.ru (tsrv.tls.msk.ru [192.168.177.2]) by isrv.corpit.ru (Postfix) with ESMTP id E2A6987EC3; Fri, 23 Aug 2024 17:14:45 +0300 (MSK) Received: from tls.msk.ru (mjt.wg.tls.msk.ru [192.168.177.130]) by tsrv.corpit.ru (Postfix) with SMTP id 91A6F12B0F6; Fri, 23 Aug 2024 17:15:42 +0300 (MSK) Received: (nullmailer pid 1411618 invoked by uid 1000); Fri, 23 Aug 2024 14:15:42 -0000 From: Michael Tokarev To: qemu-devel@nongnu.org Cc: Ani Sinha , qemu-trivial@nongnu.org, Michael Tokarev Subject: [PULL 1/3] hw/x86: add a couple of comments explaining how the kernel image is parsed Date: Fri, 23 Aug 2024 17:15:40 +0300 Message-Id: <20240823141542.1411594-2-mjt@tls.msk.ru> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240823141542.1411594-1-mjt@tls.msk.ru> References: <20240823141542.1411594-1-mjt@tls.msk.ru> MIME-Version: 1.0 Received-SPF: pass client-ip=86.62.121.231; envelope-from=mjt@tls.msk.ru; helo=isrv.corpit.ru X-Spam_score_int: -68 X-Spam_score: -6.9 X-Spam_bar: ------ X-Spam_report: (-6.9 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_HI=-5, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org From: Ani Sinha Cosmetic: add comments in x86_load_linux() pointing to the kernel documentation so that users can better understand the code. CC: qemu-trivial@nongnu.org Signed-off-by: Ani Sinha Reviewed-by: Zhao Liu Reviewed-by: Michael Tokarev Signed-off-by: Michael Tokarev --- hw/i386/x86-common.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/hw/i386/x86-common.c b/hw/i386/x86-common.c index c0c66a0eb5..992ea1f25e 100644 --- a/hw/i386/x86-common.c +++ b/hw/i386/x86-common.c @@ -665,8 +665,11 @@ void x86_load_linux(X86MachineState *x86ms, exit(1); } - /* kernel protocol version */ - if (ldl_p(header + 0x202) == 0x53726448) { + /* + * kernel protocol version. + * Please see https://www.kernel.org/doc/Documentation/x86/boot.txt + */ + if (ldl_p(header + 0x202) == 0x53726448) /* Magic signature "HdrS" */ { protocol = lduw_p(header + 0x206); } else { /*