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David Alan Gilbert" , , , , Brijesh Singh Subject: [PATCH v8 25/40] x86/compressed/acpi: move EFI config table lookup to helper Date: Fri, 10 Dec 2021 09:43:17 -0600 Message-ID: <20211210154332.11526-26-brijesh.singh@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20211210154332.11526-1-brijesh.singh@amd.com> References: <20211210154332.11526-1-brijesh.singh@amd.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB03.amd.com (10.181.40.144) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: ab0c84e6-729b-4d50-f3a1-08d9bbf3f40e X-MS-TrafficTypeDiagnostic: MN2PR12MB3102:EE_ X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:8882; X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB03.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(4636009)(36840700001)(46966006)(40470700001)(36860700001)(7416002)(36756003)(16526019)(47076005)(7406005)(7696005)(40460700001)(82310400004)(426003)(1076003)(316002)(508600001)(8936002)(83380400001)(81166007)(6666004)(356005)(70206006)(2906002)(110136005)(26005)(8676002)(44832011)(4326008)(54906003)(2616005)(336012)(5660300002)(86362001)(186003)(70586007)(2101003)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Dec 2021 15:44:29.5259 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: ab0c84e6-729b-4d50-f3a1-08d9bbf3f40e X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB03.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BN8NAM11FT057.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR12MB3102 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Michael Roth Future patches for SEV-SNP-validated CPUID will also require early parsing of the EFI configuration. Incrementally move the related code into a set of helpers that can be re-used for that purpose. Signed-off-by: Michael Roth Signed-off-by: Brijesh Singh --- arch/x86/boot/compressed/acpi.c | 25 ++++++-------------- arch/x86/boot/compressed/efi.c | 42 +++++++++++++++++++++++++++++++++ arch/x86/boot/compressed/misc.h | 9 +++++++ 3 files changed, 58 insertions(+), 18 deletions(-) diff --git a/arch/x86/boot/compressed/acpi.c b/arch/x86/boot/compressed/acpi.c index 9e784bd7b2e6..fea72a1504ff 100644 --- a/arch/x86/boot/compressed/acpi.c +++ b/arch/x86/boot/compressed/acpi.c @@ -117,8 +117,9 @@ static acpi_physical_address kexec_get_rsdp_addr(void) { return 0; } static acpi_physical_address efi_get_rsdp_addr(void) { #ifdef CONFIG_EFI - unsigned long systab_tbl_pa, config_tables; - unsigned int nr_tables; + unsigned long cfg_tbl_pa = 0; + unsigned long systab_tbl_pa; + unsigned int cfg_tbl_len; bool efi_64; int ret; @@ -134,23 +135,11 @@ static acpi_physical_address efi_get_rsdp_addr(void) if (ret) error("EFI support advertised, but unable to locate system table."); - /* Handle EFI bitness properly */ - if (efi_64) { - efi_system_table_64_t *stbl = (efi_system_table_64_t *)systab_tbl_pa; + ret = efi_get_conf_table(boot_params, &cfg_tbl_pa, &cfg_tbl_len, &efi_64); + if (ret || !cfg_tbl_pa) + error("EFI config table not found."); - config_tables = stbl->tables; - nr_tables = stbl->nr_tables; - } else { - efi_system_table_32_t *stbl = (efi_system_table_32_t *)systab_tbl_pa; - - config_tables = stbl->tables; - nr_tables = stbl->nr_tables; - } - - if (!config_tables) - error("EFI config tables not found."); - - return __efi_get_rsdp_addr(config_tables, nr_tables, efi_64); + return __efi_get_rsdp_addr(cfg_tbl_pa, cfg_tbl_len, efi_64); #else return 0; #endif diff --git a/arch/x86/boot/compressed/efi.c b/arch/x86/boot/compressed/efi.c index 1c626d28f07e..08ad517b0731 100644 --- a/arch/x86/boot/compressed/efi.c +++ b/arch/x86/boot/compressed/efi.c @@ -70,3 +70,45 @@ int efi_get_system_table(struct boot_params *boot_params, unsigned long *sys_tbl *is_efi_64 = efi_64; return 0; } + +/** + * efi_get_conf_table - Given boot_params, locate EFI system table from it + * and return the physical address EFI configuration table. + * + * @boot_params: pointer to boot_params + * @cfg_tbl_pa: location to store physical address of config table + * @cfg_tbl_len: location to store number of config table entries + * @is_efi_64: location to store whether using 64-bit EFI or not + * + * Return: 0 on success. On error, return params are left unchanged. + */ +int efi_get_conf_table(struct boot_params *boot_params, unsigned long *cfg_tbl_pa, + unsigned int *cfg_tbl_len, bool *is_efi_64) +{ + unsigned long sys_tbl_pa = 0; + int ret; + + if (!cfg_tbl_pa || !cfg_tbl_len || !is_efi_64) + return -EINVAL; + + ret = efi_get_system_table(boot_params, &sys_tbl_pa, is_efi_64); + if (ret) + return ret; + + /* Handle EFI bitness properly */ + if (*is_efi_64) { + efi_system_table_64_t *stbl = + (efi_system_table_64_t *)sys_tbl_pa; + + *cfg_tbl_pa = stbl->tables; + *cfg_tbl_len = stbl->nr_tables; + } else { + efi_system_table_32_t *stbl = + (efi_system_table_32_t *)sys_tbl_pa; + + *cfg_tbl_pa = stbl->tables; + *cfg_tbl_len = stbl->nr_tables; + } + + return 0; +} diff --git a/arch/x86/boot/compressed/misc.h b/arch/x86/boot/compressed/misc.h index 165640f64b71..1c69592e83da 100644 --- a/arch/x86/boot/compressed/misc.h +++ b/arch/x86/boot/compressed/misc.h @@ -181,6 +181,8 @@ unsigned long sev_verify_cbit(unsigned long cr3); /* helpers for early EFI config table access */ int efi_get_system_table(struct boot_params *boot_params, unsigned long *sys_tbl_pa, bool *is_efi_64); +int efi_get_conf_table(struct boot_params *boot_params, unsigned long *cfg_tbl_pa, + unsigned int *cfg_tbl_len, bool *is_efi_64); #else static inline int efi_get_system_table(struct boot_params *boot_params, @@ -188,6 +190,13 @@ efi_get_system_table(struct boot_params *boot_params, { return -ENOENT; } + +static inline int +efi_get_conf_table(struct boot_params *boot_params, unsigned long *cfg_tbl_pa, + unsigned int *cfg_tbl_len, bool *is_efi_64) +{ + return -ENOENT; +} #endif /* CONFIG_EFI */ #endif /* BOOT_COMPRESSED_MISC_H */ -- 2.25.1