aboutsummaryrefslogtreecommitdiff
path: root/drivers/sfi
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/sfi')
-rw-r--r--drivers/sfi/Kconfig17
-rw-r--r--drivers/sfi/Makefile3
-rw-r--r--drivers/sfi/sfi_acpi.c175
-rw-r--r--drivers/sfi/sfi_core.c407
-rw-r--r--drivers/sfi/sfi_core.h70
5 files changed, 672 insertions, 0 deletions
diff --git a/drivers/sfi/Kconfig b/drivers/sfi/Kconfig
new file mode 100644
index 00000000000..dd115121e0b
--- /dev/null
+++ b/drivers/sfi/Kconfig
@@ -0,0 +1,17 @@
+#
+# SFI Configuration
+#
+
+menuconfig SFI
+ bool "SFI (Simple Firmware Interface) Support"
+ ---help---
+ The Simple Firmware Interface (SFI) provides a lightweight method
+ for platform firmware to pass information to the operating system
+ via static tables in memory. Kernel SFI support is required to
+ boot on SFI-only platforms. Currently, all SFI-only platforms are
+ based on the 2nd generation Intel Atom processor platform,
+ code-named Moorestown.
+
+ For more information, see http://simplefirmware.org
+
+ Say 'Y' here to enable the kernel to boot on SFI-only platforms.
diff --git a/drivers/sfi/Makefile b/drivers/sfi/Makefile
new file mode 100644
index 00000000000..2343732aefe
--- /dev/null
+++ b/drivers/sfi/Makefile
@@ -0,0 +1,3 @@
+obj-y += sfi_acpi.o
+obj-y += sfi_core.o
+
diff --git a/drivers/sfi/sfi_acpi.c b/drivers/sfi/sfi_acpi.c
new file mode 100644
index 00000000000..34aba30eb84
--- /dev/null
+++ b/drivers/sfi/sfi_acpi.c
@@ -0,0 +1,175 @@
+/* sfi_acpi.c Simple Firmware Interface - ACPI extensions */
+
+/*
+
+ 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
+
+#include <linux/kernel.h>
+#include <acpi/acpi.h>
+
+#include <linux/sfi.h>
+#include "sfi_core.h"
+
+/*
+ * 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.
+ */
+
+static struct acpi_table_xsdt *xsdt_va __read_mostly;
+
+#define XSDT_GET_NUM_ENTRIES(ptable, entry_type) \
+ ((ptable->header.length - sizeof(struct acpi_table_header)) / \
+ (sizeof(entry_type)))
+
+static inline struct sfi_table_header *acpi_to_sfi_th(
+ struct acpi_table_header *th)
+{
+ return (struct sfi_table_header *)th;
+}
+
+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;
+
+ 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;
+ }
+ }
+
+ return 0;
+}
+
+int __init sfi_acpi_init(void)
+{
+ struct sfi_table_key xsdt_key = { .sig = SFI_SIG_XSDT };
+
+ sfi_table_parse(SFI_SIG_XSDT, NULL, NULL, sfi_acpi_parse_xsdt);
+
+ /* Only call the get_table to keep the table mapped */
+ xsdt_va = (struct acpi_table_xsdt *)sfi_get_table(&xsdt_key);
+ return 0;
+}
+
+static struct acpi_table_header *sfi_acpi_get_table(struct sfi_table_key *key)
+{
+ u32 tbl_cnt, i;
+ void *ret;
+
+ 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);
+ }
+
+ return NULL;
+}
+
+static void sfi_acpi_put_table(struct acpi_table_header *table)
+{
+ sfi_put_table(acpi_to_sfi_th(table));
+}
+
+/*
+ * 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;
+
+ if (sfi_disabled)
+ return -1;
+
+ key.sig = signature;
+ key.oem_id = oem_id;
+ key.oem_table_id = oem_table_id;
+
+ table = sfi_acpi_get_table(&key);
+ if (!table)
+ return -EINVAL;
+
+ ret = handler(table);
+ sfi_acpi_put_table(table);
+ return ret;
+}
diff --git a/drivers/sfi/sfi_core.c b/drivers/sfi/sfi_core.c
new file mode 100644
index 00000000000..d3b49680047
--- /dev/null
+++ b/drivers/sfi/sfi_core.c
@@ -0,0 +1,407 @@
+/* sfi_core.c Simple Firmware Interface - core internals */
+
+/*
+
+ 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
+
+#include <linux/bootmem.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/acpi.h>
+#include <linux/init.h>
+#include <linux/sfi.h>
+
+#include "sfi_core.h"
+
+#define ON_SAME_PAGE(addr1, addr2) \
+ (((unsigned long)(addr1) & PAGE_MASK) == \
+ ((unsigned long)(addr2) & PAGE_MASK))
+#define TABLE_ON_PAGE(page, table, size) (ON_SAME_PAGE(page, table) && \
+ ON_SAME_PAGE(page, table + size))
+
+int sfi_disabled __read_mostly;
+EXPORT_SYMBOL(sfi_disabled);
+
+static u64 syst_pa __read_mostly;
+static struct sfi_table_simple *syst_va __read_mostly;
+
+/*
+ * FW creates and saves the SFI tables in memory. When these tables get
+ * used, they may need to be mapped to virtual address space, and the mapping
+ * can happen before or after the ioremap() is ready, so a flag is needed
+ * to indicating this
+ */
+static u32 sfi_use_ioremap __read_mostly;
+
+static void __iomem *sfi_map_memory(u64 phys, u32 size)
+{
+ if (!phys || !size)
+ return NULL;
+
+ if (sfi_use_ioremap)
+ return ioremap(phys, size);
+ else
+ return early_ioremap(phys, size);
+}
+
+static void sfi_unmap_memory(void __iomem *virt, u32 size)
+{
+ if (!virt || !size)
+ return;
+
+ if (sfi_use_ioremap)
+ iounmap(virt);
+ else
+ early_iounmap(virt, size);
+}
+
+static void sfi_print_table_header(unsigned long long pa,
+ struct sfi_table_header *header)
+{
+ pr_info("%4.4s %llX, %04X (v%d %6.6s %8.8s)\n",
+ header->sig, pa,
+ header->len, header->rev, header->oem_id,
+ header->oem_table_id);
+}
+
+/*
+ * sfi_verify_table()
+ * Sanity check table lengh, calculate checksum
+ */
+static __init int sfi_verify_table(struct sfi_table_header *table)
+{
+
+ u8 checksum = 0;
+ u8 *puchar = (u8 *)table;
+ u32 length = table->len;
+
+ /* Sanity check table length against arbitrary 1MB limit */
+ if (length > 0x100000) {
+ pr_err("Invalid table length 0x%x\n", length);
+ return -1;
+ }
+
+ while (length--)
+ checksum += *puchar++;
+
+ if (checksum) {
+ pr_err("Checksum %2.2X should be %2.2X\n",
+ table->csum, table->csum - checksum);
+ return -1;
+ }
+ return 0;
+}
+
+/*
+ * sfi_map_table()
+ *
+ * Return address of mapped table
+ * Check for common case that we can re-use mapping to SYST,
+ * which requires syst_pa, syst_va to be initialized.
+ */
+struct sfi_table_header *sfi_map_table(u64 pa)
+{
+ struct sfi_table_header *th;
+ u32 length;
+
+ if (!TABLE_ON_PAGE(syst_pa, pa, sizeof(struct sfi_table_header)))
+ th = sfi_map_memory(pa, sizeof(struct sfi_table_header));
+ else
+ th = (void *)syst_va + (pa - syst_pa);
+
+ /* If table fits on same page as its header, we are done */
+ if (TABLE_ON_PAGE(th, th, th->len))
+ return th;
+
+ /* Entire table does not fit on same page as SYST */
+ length = th->len;
+ if (!TABLE_ON_PAGE(syst_pa, pa, sizeof(struct sfi_table_header)))
+ sfi_unmap_memory(th, sizeof(struct sfi_table_header));
+
+ return sfi_map_memory(pa, length);
+}
+
+/*
+ * sfi_unmap_table()
+ *
+ * Undoes effect of sfi_map_table() by unmapping table
+ * if it did not completely fit on same page as SYST.
+ */
+void sfi_unmap_table(struct sfi_table_header *th)
+{
+ if (!TABLE_ON_PAGE(syst_va, th, th->len))
+ sfi_unmap_memory(th, TABLE_ON_PAGE(th, th, th->len) ?
+ sizeof(*th) : th->len);
+}
+
+static int sfi_table_check_key(struct sfi_table_header *th,
+ struct sfi_table_key *key)
+{
+
+ if (strncmp(th->sig, key->sig, SFI_SIGNATURE_SIZE)
+ || (key->oem_id && strncmp(th->oem_id,
+ key->oem_id, SFI_OEM_ID_SIZE))
+ || (key->oem_table_id && strncmp(th->oem_table_id,
+ key->oem_table_id, SFI_OEM_TABLE_ID_SIZE)))
+ return -1;
+
+ return 0;
+}
+
+/*
+ * This function will be used in 2 cases:
+ * 1. used to enumerate and verify the tables addressed by SYST/XSDT,
+ * thus no signature will be given (in kernel boot phase)
+ * 2. used to parse one specific table, signature must exist, and
+ * the mapped virt address will be returned, and the virt space
+ * will be released by call sfi_put_table() later
+ *
+ * Return value:
+ * NULL: when can't find a table matching the key
+ * ERR_PTR(error): error value
+ * virt table address: when a matched table is found
+ */
+struct sfi_table_header *sfi_check_table(u64 pa, struct sfi_table_key *key)
+{
+ struct sfi_table_header *th;
+ void *ret = NULL;
+
+ th = sfi_map_table(pa);
+ if (!th)
+ return ERR_PTR(-ENOMEM);
+
+ if (!key->sig) {
+ sfi_print_table_header(pa, th);
+ if (sfi_verify_table(th))
+ ret = ERR_PTR(-EINVAL);
+ } else {
+ if (!sfi_table_check_key(th, key))
+ return th; /* Success */
+ }
+
+ sfi_unmap_table(th);
+ return ret;
+}
+
+/*
+ * sfi_get_table()
+ *
+ * Search SYST for the specified table with the signature in
+ * the key, and return the mapped table
+ */
+struct sfi_table_header *sfi_get_table(struct sfi_table_key *key)
+{
+ struct sfi_table_header *th;
+ u32 tbl_cnt, i;
+
+ tbl_cnt = SFI_GET_NUM_ENTRIES(syst_va, u64);
+ for (i = 0; i < tbl_cnt; i++) {
+ th = sfi_check_table(syst_va->pentry[i], key);
+ if (!IS_ERR(th) && th)
+ return th;
+ }
+
+ return NULL;
+}
+
+void sfi_put_table(struct sfi_table_header *th)
+{
+ sfi_unmap_table(th);
+}
+
+/* Find table with signature, run handler on it */
+int sfi_table_parse(char *signature, char *oem_id, char *oem_table_id,
+ sfi_table_handler handler)
+{
+ struct sfi_table_header *table = NULL;
+ struct sfi_table_key key;
+ int ret = -EINVAL;
+
+ if (sfi_disabled || !handler || !signature)
+ goto exit;
+
+ key.sig = signature;
+ key.oem_id = oem_id;
+ key.oem_table_id = oem_table_id;
+
+ table = sfi_get_table(&key);
+ if (!table)
+ goto exit;
+
+ ret = handler(table);
+ sfi_put_table(table);
+exit:
+ return ret;
+}
+EXPORT_SYMBOL_GPL(sfi_table_parse);
+
+/*
+ * sfi_parse_syst()
+ * Checksum all the tables in SYST and print their headers
+ *
+ * success: set syst_va, return 0
+ */
+static int __init sfi_parse_syst(void)
+{
+ struct sfi_table_key key = SFI_ANY_KEY;
+ int tbl_cnt, i;
+ void *ret;
+
+ syst_va = sfi_map_memory(syst_pa, sizeof(struct sfi_table_simple));
+ if (!syst_va)
+ return -ENOMEM;
+
+ tbl_cnt = SFI_GET_NUM_ENTRIES(syst_va, u64);
+ for (i = 0; i < tbl_cnt; i++) {
+ ret = sfi_check_table(syst_va->pentry[i], &key);
+ if (IS_ERR(ret))
+ return PTR_ERR(ret);
+ }
+
+ return 0;
+}
+
+/*
+ * The OS finds the System Table by searching 16-byte boundaries between
+ * physical address 0x000E0000 and 0x000FFFFF. The OS shall search this region
+ * starting at the low address and shall stop searching when the 1st valid SFI
+ * System Table is found.
+ *
+ * success: set syst_pa, return 0
+ * fail: return -1
+ */
+static __init int sfi_find_syst(void)
+{
+ unsigned long offset, len;
+ void *start;
+
+ len = SFI_SYST_SEARCH_END - SFI_SYST_SEARCH_BEGIN;
+ start = sfi_map_memory(SFI_SYST_SEARCH_BEGIN, len);
+ if (!start)
+ return -1;
+
+ for (offset = 0; offset < len; offset += 16) {
+ struct sfi_table_header *syst_hdr;
+
+ syst_hdr = start + offset;
+ if (strncmp(syst_hdr->sig, SFI_SIG_SYST,
+ SFI_SIGNATURE_SIZE))
+ continue;
+
+ if (syst_hdr->len > PAGE_SIZE)
+ continue;
+
+ sfi_print_table_header(SFI_SYST_SEARCH_BEGIN + offset,
+ syst_hdr);
+
+ if (sfi_verify_table(syst_hdr))
+ continue;
+
+ /*
+ * Enforce SFI spec mandate that SYST reside within a page.
+ */
+ if (!ON_SAME_PAGE(syst_pa, syst_pa + syst_hdr->len)) {
+ pr_info("SYST 0x%llx + 0x%x crosses page\n",
+ syst_pa, syst_hdr->len);
+ continue;
+ }
+
+ /* Success */
+ syst_pa = SFI_SYST_SEARCH_BEGIN + offset;
+ sfi_unmap_memory(start, len);
+ return 0;
+ }
+
+ sfi_unmap_memory(start, len);
+ return -1;
+}
+
+void __init sfi_init(void)
+{
+ if (!acpi_disabled)
+ disable_sfi();
+
+ if (sfi_disabled)
+ return;
+
+ pr_info("Simple Firmware Interface v0.7 http://simplefirmware.org\n");
+
+ if (sfi_find_syst() || sfi_parse_syst() || sfi_platform_init())
+ disable_sfi();
+
+ return;
+}
+
+void __init sfi_init_late(void)
+{
+ int length;
+
+ if (sfi_disabled)
+ return;
+
+ length = syst_va->header.len;
+ sfi_unmap_memory(syst_va, sizeof(struct sfi_table_simple));
+
+ /* Use ioremap now after it is ready */
+ sfi_use_ioremap = 1;
+ syst_va = sfi_map_memory(syst_pa, length);
+
+ sfi_acpi_init();
+}
diff --git a/drivers/sfi/sfi_core.h b/drivers/sfi/sfi_core.h
new file mode 100644
index 00000000000..da82d39e104
--- /dev/null
+++ b/drivers/sfi/sfi_core.h
@@ -0,0 +1,70 @@
+/* sfi_core.h Simple Firmware Interface, internal header */
+
+/*
+
+ 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.
+
+*/
+struct sfi_table_key{
+ char *sig;
+ char *oem_id;
+ char *oem_table_id;
+};
+
+#define SFI_ANY_KEY { .sig = NULL, .oem_id = NULL, .oem_table_id = NULL }
+
+extern int __init sfi_acpi_init(void);
+extern struct sfi_table_header *sfi_check_table(u64 paddr,
+ struct sfi_table_key *key);
+struct sfi_table_header *sfi_get_table(struct sfi_table_key *key);
+extern void sfi_put_table(struct sfi_table_header *table);