From patchwork Mon Feb 13 10:17:38 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nikos Nikoleris X-Patchwork-Id: 13138165 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 423F3C636CC for ; Mon, 13 Feb 2023 10:18:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230323AbjBMKSZ (ORCPT ); Mon, 13 Feb 2023 05:18:25 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53362 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230305AbjBMKSS (ORCPT ); Mon, 13 Feb 2023 05:18:18 -0500 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 47C929ED7 for ; Mon, 13 Feb 2023 02:18:15 -0800 (PST) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id A79ED1D13; Mon, 13 Feb 2023 02:18:57 -0800 (PST) Received: from godel.lab.cambridge.arm.com (godel.lab.cambridge.arm.com [10.7.66.42]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 3329E3F703; Mon, 13 Feb 2023 02:18:14 -0800 (PST) From: Nikos Nikoleris To: kvm@vger.kernel.org, kvmarm@lists.linux.dev, andrew.jones@linux.dev Cc: pbonzini@redhat.com, alexandru.elisei@arm.com, ricarkol@google.com Subject: [PATCH v4 09/30] lib/acpi: Add support for the XSDT table Date: Mon, 13 Feb 2023 10:17:38 +0000 Message-Id: <20230213101759.2577077-10-nikos.nikoleris@arm.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230213101759.2577077-1-nikos.nikoleris@arm.com> References: <20230213101759.2577077-1-nikos.nikoleris@arm.com> MIME-Version: 1.0 X-ARM-No-Footer: FoSSMail Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org XSDT provides pointers to other ACPI tables much like RSDT. However, contrary to RSDT that provides 32-bit addresses, XSDT provides 64-bit pointers. ACPI requires that if XSDT is valid then it takes precedence over RSDT. Signed-off-by: Nikos Nikoleris Reviewed-by: Andrew Jones [ Alex E: Use flexible array member for XSDT struct ] Signed-off-by: Alexandru Elisei --- lib/acpi.c | 40 ++++++++++++++++++++++++++++++++-------- lib/acpi.h | 6 ++++++ 2 files changed, 38 insertions(+), 8 deletions(-) diff --git a/lib/acpi.c b/lib/acpi.c index 166ffd14..d35f09a6 100644 --- a/lib/acpi.c +++ b/lib/acpi.c @@ -37,7 +37,8 @@ static struct acpi_table_rsdp *get_rsdp(void) void *find_acpi_table_addr(u32 sig) { - struct acpi_table_rsdt_rev1 *rsdt; + struct acpi_table_rsdt_rev1 *rsdt = NULL; + struct acpi_table_xsdt *xsdt = NULL; struct acpi_table_rsdp *rsdp; void *end; int i; @@ -62,18 +63,41 @@ void *find_acpi_table_addr(u32 sig) return rsdp; rsdt = (void *)(ulong) rsdp->rsdt_physical_address; - if (!rsdt || rsdt->signature != RSDT_SIGNATURE) - return NULL; + if (rsdt && rsdt->signature != RSDT_SIGNATURE) + rsdt = NULL; if (sig == RSDT_SIGNATURE) return rsdt; - end = (void *)rsdt + rsdt->length; - for (i = 0; (void *)&rsdt->table_offset_entry[i] < end; i++) { - struct acpi_table *t = (void *)(ulong) rsdt->table_offset_entry[i]; + if (rsdp->revision >= 2) { + xsdt = (void *)rsdp->xsdt_physical_address; + if (xsdt && xsdt->signature != XSDT_SIGNATURE) + xsdt = NULL; + } - if (t && t->signature == sig) - return t; + if (sig == XSDT_SIGNATURE) + return xsdt; + + /* + * When the system implements APCI 2.0 and above and XSDT is valid we + * have use XSDT to find other ACPI tables, otherwise, we use RSDT. + */ + if (xsdt) { + end = (void *)xsdt + xsdt->length; + for (i = 0; (void *)&xsdt->table_offset_entry[i] < end; i++) { + struct acpi_table *t = (void *)(ulong) xsdt->table_offset_entry[i]; + + if (t && t->signature == sig) + return t; + } + } else if (rsdt) { + end = (void *)rsdt + rsdt->length; + for (i = 0; (void *)&rsdt->table_offset_entry[i] < end; i++) { + struct acpi_table *t = (void *)(ulong) rsdt->table_offset_entry[i]; + + if (t && t->signature == sig) + return t; + } } return NULL; diff --git a/lib/acpi.h b/lib/acpi.h index 67d12942..621ad08a 100644 --- a/lib/acpi.h +++ b/lib/acpi.h @@ -14,6 +14,7 @@ #define RSDP_SIGNATURE ACPI_SIGNATURE('R','S','D','P') #define RSDT_SIGNATURE ACPI_SIGNATURE('R','S','D','T') +#define XSDT_SIGNATURE ACPI_SIGNATURE('X','S','D','T') #define FACP_SIGNATURE ACPI_SIGNATURE('F','A','C','P') #define FACS_SIGNATURE ACPI_SIGNATURE('F','A','C','S') @@ -56,6 +57,11 @@ struct acpi_table_rsdt_rev1 { u32 table_offset_entry[]; }; +struct acpi_table_xsdt { + ACPI_TABLE_HEADER_DEF + u64 table_offset_entry[]; +}; + struct acpi_table_fadt_rev1 { ACPI_TABLE_HEADER_DEF /* ACPI common table header */ u32 firmware_ctrl; /* Physical address of FACS */