From patchwork Fri May 6 14:08:34 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nikos Nikoleris X-Patchwork-Id: 12841219 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 193B4C433FE for ; Fri, 6 May 2022 14:09:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1442013AbiEFOM4 (ORCPT ); Fri, 6 May 2022 10:12:56 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34430 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1391048AbiEFOMt (ORCPT ); Fri, 6 May 2022 10:12:49 -0400 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id ECDA866F83 for ; Fri, 6 May 2022 07:09:05 -0700 (PDT) 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 C7AF314BF; Fri, 6 May 2022 07:09:05 -0700 (PDT) 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 F32343F885; Fri, 6 May 2022 07:09:04 -0700 (PDT) From: Nikos Nikoleris To: Paolo Bonzini Cc: jade.alglave@arm.com, alexandru.elisei@arm.com, Nikos Nikoleris , kvm@vger.kernel.org Subject: [kvm-unit-tests PATCH 02/23] lib: Ensure all struct definition for ACPI tables are packed Date: Fri, 6 May 2022 15:08:34 +0100 Message-Id: <20220506140855.353337-3-nikos.nikoleris@arm.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220506140855.353337-1-nikos.nikoleris@arm.com> References: <20220506140855.353337-1-nikos.nikoleris@arm.com> MIME-Version: 1.0 X-ARM-No-Footer: FoSSMail Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org All ACPI table definitions are provided with precise definitions of field sizes and offsets, make sure that no compiler optimization can interfere with the memory layout of the corresponding structs. Signed-off-by: Nikos Nikoleris --- lib/acpi.h | 11 ++++++++--- x86/s3.c | 16 ++++------------ 2 files changed, 12 insertions(+), 15 deletions(-) diff --git a/lib/acpi.h b/lib/acpi.h index 1e89840..2a43cbf 100644 --- a/lib/acpi.h +++ b/lib/acpi.h @@ -3,6 +3,11 @@ #include "libcflat.h" +/* + * All tables and structures must be byte-packed to match the ACPI + * specification, since the tables are provided by the system BIOS + */ + #define ACPI_SIGNATURE(c1, c2, c3, c4) \ ((c1) | ((c2) << 8) | ((c3) << 16) | ((c4) << 24)) @@ -44,12 +49,12 @@ struct rsdp_descriptor { /* Root System Descriptor Pointer */ struct acpi_table { ACPI_TABLE_HEADER_DEF char data[0]; -}; +} __attribute__ ((packed)); struct rsdt_descriptor_rev1 { ACPI_TABLE_HEADER_DEF u32 table_offset_entry[0]; -}; +} __attribute__ ((packed));; struct fadt_descriptor_rev1 { @@ -104,7 +109,7 @@ struct facs_descriptor_rev1 u32 S4bios_f : 1; /* Indicates if S4BIOS support is present */ u32 reserved1 : 31; /* Must be 0 */ u8 reserved3 [40]; /* Reserved - must be zero */ -}; +} __attribute__ ((packed)); void set_efi_rsdp(struct rsdp_descriptor *rsdp); void* find_acpi_table_addr(u32 sig); diff --git a/x86/s3.c b/x86/s3.c index 378d37a..89d69fc 100644 --- a/x86/s3.c +++ b/x86/s3.c @@ -2,15 +2,6 @@ #include "acpi.h" #include "asm/io.h" -static u32* find_resume_vector_addr(void) -{ - struct facs_descriptor_rev1 *facs = find_acpi_table_addr(FACS_SIGNATURE); - if (!facs) - return 0; - printf("FACS is at %p\n", facs); - return &facs->firmware_waking_vector; -} - #define RTC_SECONDS_ALARM 1 #define RTC_MINUTES_ALARM 3 #define RTC_HOURS_ALARM 5 @@ -40,12 +31,13 @@ extern char resume_start, resume_end; int main(int argc, char **argv) { struct fadt_descriptor_rev1 *fadt = find_acpi_table_addr(FACP_SIGNATURE); - volatile u32 *resume_vector_ptr = find_resume_vector_addr(); + struct facs_descriptor_rev1 *facs = find_acpi_table_addr(FACS_SIGNATURE); char *addr, *resume_vec = (void*)0x1000; - *resume_vector_ptr = (u32)(ulong)resume_vec; + facs->firmware_waking_vector = (u32)(ulong)resume_vec; - printf("resume vector addr is %p\n", resume_vector_ptr); + printf("FACS is at %p\n", facs); + printf("resume vector addr is %p\n", &facs->firmware_waking_vector); for (addr = &resume_start; addr < &resume_end; addr++) *resume_vec++ = *addr; printf("copy resume code from %p\n", &resume_start);