From patchwork Wed Oct 17 10:20:09 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chao Fan X-Patchwork-Id: 10645269 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 7C8D61057 for ; Wed, 17 Oct 2018 10:21:40 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6BEFD2ACF2 for ; Wed, 17 Oct 2018 10:21:40 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 606C12ACF1; Wed, 17 Oct 2018 10:21:40 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 024282ACF2 for ; Wed, 17 Oct 2018 10:21:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727280AbeJQSQQ (ORCPT ); Wed, 17 Oct 2018 14:16:16 -0400 Received: from mail.cn.fujitsu.com ([183.91.158.132]:24037 "EHLO heian.cn.fujitsu.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727208AbeJQSQP (ORCPT ); Wed, 17 Oct 2018 14:16:15 -0400 X-IronPort-AV: E=Sophos;i="5.43,368,1503331200"; d="scan'208";a="46265555" Received: from unknown (HELO cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 17 Oct 2018 18:21:11 +0800 Received: from G08CNEXCHPEKD01.g08.fujitsu.local (unknown [10.167.33.80]) by cn.fujitsu.com (Postfix) with ESMTP id DCF9C4B6ED68; Wed, 17 Oct 2018 18:21:06 +0800 (CST) Received: from localhost.localdomain (10.167.225.56) by G08CNEXCHPEKD01.g08.fujitsu.local (10.167.33.89) with Microsoft SMTP Server (TLS) id 14.3.408.0; Wed, 17 Oct 2018 18:21:12 +0800 From: Chao Fan To: , , , , , , , , , , CC: , , Subject: [PATCH v9 5/8] x86/boot: Add get_acpi_rsdp() to parse RSDP in cmdlien from kexec Date: Wed, 17 Oct 2018 18:20:09 +0800 Message-ID: <20181017102012.872-6-fanc.fnst@cn.fujitsu.com> X-Mailer: git-send-email 2.17.2 In-Reply-To: <20181017102012.872-1-fanc.fnst@cn.fujitsu.com> References: <20181017102012.872-1-fanc.fnst@cn.fujitsu.com> MIME-Version: 1.0 X-Originating-IP: [10.167.225.56] X-yoursite-MailScanner-ID: DCF9C4B6ED68.A053A X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: fanc.fnst@cn.fujitsu.com Sender: linux-acpi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP If KEXEC write the RSDP pointer to cmdline, parse the cmdline and use it. Imitate from early_param of "acpi_rsdp". Signed-off-by: Chao Fan --- arch/x86/boot/compressed/acpitb.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/arch/x86/boot/compressed/acpitb.c b/arch/x86/boot/compressed/acpitb.c index 50fa65cf824d..37b1f4407be8 100644 --- a/arch/x86/boot/compressed/acpitb.c +++ b/arch/x86/boot/compressed/acpitb.c @@ -8,6 +8,9 @@ #include #include +#define STATIC +#include + /* Search EFI table for RSDP table. */ static void efi_get_rsdp_addr(acpi_physical_address *rsdp_addr) { @@ -200,3 +203,23 @@ static void bios_get_rsdp_addr(acpi_physical_address *rsdp_addr) *rsdp_addr = (acpi_physical_address)address; } } + +static void get_acpi_rsdp(acpi_physical_address *rsdp_addr) +{ +#ifdef CONFIG_KEXEC + unsigned long long res; + int len = 0; + char *val; + + val = malloc(20); + len = cmdline_find_option("acpi_rsdp", val, 20); + + if (len == -1) + return; + + if (len > 0) { + val[len] = 0; + *rsdp_addr = (acpi_physical_address)kstrtoull(val, 0, &res); + } +#endif +}