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SFI: add capability to parse ACPI tables
Extend SFI to access standard ACPI tables. (eg. the PCI MCFG) using sfi_acpi_table_parse(). Note that this is _not_ a hybrid ACPI + SFI mode. The platform boots in either ACPI mode or SFI mode. SFI runs only with acpi_disabled=1, which can be set at build-time via CONFIG_ACPI=n, or at boot time by the failure to find ACPI platform support. So this extension simply allows SFI-platforms to re-use existing standard table formats that happen to be defined to live in ACPI envelopes. Signed-off-by: Feng Tang <[email protected]> Signed-off-by: Len Brown <[email protected]>
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| Original file line number | Diff line number | Diff line change |
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| /* sfi_acpi.c Simple Firmware Interface - ACPI extensions */ | ||
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| /* | ||
| This file is provided under a dual BSD/GPLv2 license. When using or | ||
| redistributing this file, you may do so under either license. | ||
| GPL LICENSE SUMMARY | ||
| Copyright(c) 2009 Intel Corporation. All rights reserved. | ||
| This program is free software; you can redistribute it and/or modify | ||
| it under the terms of version 2 of the GNU General Public License as | ||
| published by the Free Software Foundation. | ||
| This program is distributed in the hope that it will be useful, but | ||
| WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| General Public License for more details. | ||
| You should have received a copy of the GNU General Public License | ||
| along with this program; if not, write to the Free Software | ||
| Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. | ||
| The full GNU General Public License is included in this distribution | ||
| in the file called LICENSE.GPL. | ||
| BSD LICENSE | ||
| Copyright(c) 2009 Intel Corporation. All rights reserved. | ||
| Redistribution and use in source and binary forms, with or without | ||
| modification, are permitted provided that the following conditions | ||
| are met: | ||
| * Redistributions of source code must retain the above copyright | ||
| notice, this list of conditions and the following disclaimer. | ||
| * Redistributions in binary form must reproduce the above copyright | ||
| notice, this list of conditions and the following disclaimer in | ||
| the documentation and/or other materials provided with the | ||
| distribution. | ||
| * Neither the name of Intel Corporation nor the names of its | ||
| contributors may be used to endorse or promote products derived | ||
| from this software without specific prior written permission. | ||
| THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | ||
| "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | ||
| LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | ||
| A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | ||
| OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | ||
| SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | ||
| LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | ||
| DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | ||
| THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | ||
| (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | ||
| OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | ||
| */ | ||
|
|
||
| #define KMSG_COMPONENT "SFI" | ||
| #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | ||
|
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| #include <linux/kernel.h> | ||
| #include <acpi/acpi.h> | ||
|
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| #include <linux/sfi.h> | ||
| #include "sfi_core.h" | ||
|
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| /* | ||
| * SFI can access ACPI-defined tables via an optional ACPI XSDT. | ||
| * | ||
| * This allows re-use, and avoids re-definition, of standard tables. | ||
| * For example, the "MCFG" table is defined by PCI, reserved by ACPI, | ||
| * and is expected to be present many SFI-only systems. | ||
| */ | ||
|
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| static struct acpi_table_xsdt *xsdt_va __read_mostly; | ||
|
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| #define XSDT_GET_NUM_ENTRIES(ptable, entry_type) \ | ||
| ((ptable->header.length - sizeof(struct acpi_table_header)) / \ | ||
| (sizeof(entry_type))) | ||
|
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| static inline struct sfi_table_header *acpi_to_sfi_th( | ||
| struct acpi_table_header *th) | ||
| { | ||
| return (struct sfi_table_header *)th; | ||
| } | ||
|
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| static inline struct acpi_table_header *sfi_to_acpi_th( | ||
| struct sfi_table_header *th) | ||
| { | ||
| return (struct acpi_table_header *)th; | ||
| } | ||
|
|
||
| /* | ||
| * sfi_acpi_parse_xsdt() | ||
| * | ||
| * Parse the ACPI XSDT for later access by sfi_acpi_table_parse(). | ||
| */ | ||
| static int __init sfi_acpi_parse_xsdt(struct sfi_table_header *th) | ||
| { | ||
| struct sfi_table_key key = SFI_ANY_KEY; | ||
| int tbl_cnt, i; | ||
| void *ret; | ||
|
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| xsdt_va = (struct acpi_table_xsdt *)th; | ||
| tbl_cnt = XSDT_GET_NUM_ENTRIES(xsdt_va, u64); | ||
| for (i = 0; i < tbl_cnt; i++) { | ||
| ret = sfi_check_table(xsdt_va->table_offset_entry[i], &key); | ||
| if (IS_ERR(ret)) { | ||
| disable_sfi(); | ||
| return -1; | ||
| } | ||
| } | ||
|
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| return 0; | ||
| } | ||
|
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| int __init sfi_acpi_init(void) | ||
| { | ||
| struct sfi_table_key xsdt_key = { .sig = SFI_SIG_XSDT }; | ||
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| sfi_table_parse(SFI_SIG_XSDT, NULL, NULL, sfi_acpi_parse_xsdt); | ||
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| /* Only call the get_table to keep the table mapped */ | ||
| xsdt_va = (struct acpi_table_xsdt *)sfi_get_table(&xsdt_key); | ||
| return 0; | ||
| } | ||
|
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| static struct acpi_table_header *sfi_acpi_get_table(struct sfi_table_key *key) | ||
| { | ||
| u32 tbl_cnt, i; | ||
| void *ret; | ||
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| tbl_cnt = XSDT_GET_NUM_ENTRIES(xsdt_va, u64); | ||
| for (i = 0; i < tbl_cnt; i++) { | ||
| ret = sfi_check_table(xsdt_va->table_offset_entry[i], key); | ||
| if (!IS_ERR(ret) && ret) | ||
| return sfi_to_acpi_th(ret); | ||
| } | ||
|
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| return NULL; | ||
| } | ||
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| static void sfi_acpi_put_table(struct acpi_table_header *table) | ||
| { | ||
| sfi_put_table(acpi_to_sfi_th(table)); | ||
| } | ||
|
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| /* | ||
| * sfi_acpi_table_parse() | ||
| * | ||
| * Find specified table in XSDT, run handler on it and return its return value | ||
| */ | ||
| int sfi_acpi_table_parse(char *signature, char *oem_id, char *oem_table_id, | ||
| int(*handler)(struct acpi_table_header *)) | ||
| { | ||
| struct acpi_table_header *table = NULL; | ||
| struct sfi_table_key key; | ||
| int ret = 0; | ||
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| if (sfi_disabled) | ||
| return -1; | ||
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| key.sig = signature; | ||
| key.oem_id = oem_id; | ||
| key.oem_table_id = oem_table_id; | ||
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| table = sfi_acpi_get_table(&key); | ||
| if (!table) | ||
| return -EINVAL; | ||
|
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| ret = handler(table); | ||
| sfi_acpi_put_table(table); | ||
| return ret; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,93 @@ | ||
| /* sfi.h Simple Firmware Interface */ | ||
|
|
||
| /* | ||
| This file is provided under a dual BSD/GPLv2 license. When using or | ||
| redistributing this file, you may do so under either license. | ||
| GPL LICENSE SUMMARY | ||
| Copyright(c) 2009 Intel Corporation. All rights reserved. | ||
| This program is free software; you can redistribute it and/or modify | ||
| it under the terms of version 2 of the GNU General Public License as | ||
| published by the Free Software Foundation. | ||
| This program is distributed in the hope that it will be useful, but | ||
| WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| General Public License for more details. | ||
| You should have received a copy of the GNU General Public License | ||
| along with this program; if not, write to the Free Software | ||
| Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. | ||
| The full GNU General Public License is included in this distribution | ||
| in the file called LICENSE.GPL. | ||
| BSD LICENSE | ||
| Copyright(c) 2009 Intel Corporation. All rights reserved. | ||
| Redistribution and use in source and binary forms, with or without | ||
| modification, are permitted provided that the following conditions | ||
| are met: | ||
| * Redistributions of source code must retain the above copyright | ||
| notice, this list of conditions and the following disclaimer. | ||
| * Redistributions in binary form must reproduce the above copyright | ||
| notice, this list of conditions and the following disclaimer in | ||
| the documentation and/or other materials provided with the | ||
| distribution. | ||
| * Neither the name of Intel Corporation nor the names of its | ||
| contributors may be used to endorse or promote products derived | ||
| from this software without specific prior written permission. | ||
| THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | ||
| "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | ||
| LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | ||
| A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | ||
| OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | ||
| SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | ||
| LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | ||
| DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | ||
| THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | ||
| (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | ||
| OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | ||
| */ | ||
|
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| #ifndef _LINUX_SFI_ACPI_H | ||
| #define _LINUX_SFI_ACPI_H | ||
|
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| #ifdef CONFIG_SFI | ||
| #include <acpi/acpi.h> /* struct acpi_table_header */ | ||
|
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| extern int sfi_acpi_table_parse(char *signature, char *oem_id, | ||
| char *oem_table_id, | ||
| int (*handler)(struct acpi_table_header *)); | ||
|
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| static inline int acpi_sfi_table_parse(char *signature, | ||
| int (*handler)(struct acpi_table_header *)) | ||
| { | ||
| if (!acpi_table_parse(signature, handler)) | ||
| return 0; | ||
|
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| return sfi_acpi_table_parse(signature, NULL, NULL, handler); | ||
| } | ||
| #else /* !CONFIG_SFI */ | ||
|
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| static inline int sfi_acpi_table_parse(char *signature, char *oem_id, | ||
| char *oem_table_id, | ||
| int (*handler)(struct acpi_table_header *)) | ||
| { | ||
| return -1; | ||
| } | ||
|
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| static inline int acpi_sfi_table_parse(char *signature, | ||
| int (*handler)(struct acpi_table_header *)) | ||
| { | ||
| return acpi_table_parse(signature, handler); | ||
| } | ||
| #endif /* !CONFIG_SFI */ | ||
|
|
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| #endif /*_LINUX_SFI_ACPI_H*/ |