Date:	Tue, 23 Jun 2009 03:14:01 -0400
From:	Len Brown <lenb@...nel.org>
To:	sfi-devel@...plefirmware.org, linux-kernel@...r.kernel.org
Cc:	Feng Tang <feng.tang@...el.com>, Len Brown <len.brown@...el.com>
Subject: [PATCH 3/8] SFI: core support

From: Feng Tang <feng.tang@...el.com>

drivers/sfi/sfi_core.c contains the generic SFI implementation.
It has a private header, sfi_core.h, for its own use and the
private use of future files in drivers/sfi/

arch/x86/kernel/sfi.c serves the dual-purpose of supporting the
SFI core with arch specific code, as well as a home for the
arch-specific code that uses SFI.

Signed-off-by: Feng Tang <feng.tang@...el.com>
Signed-off-by: Len Brown <len.brown@...el.com>
---
 arch/x86/kernel/Makefile |    1 +
 arch/x86/kernel/sfi.c    |  335 ++++++++++++++++++++++++++++++++++++++
 drivers/Makefile         |    1 +
 drivers/sfi/Makefile     |    1 +
 drivers/sfi/sfi_core.c   |  403 ++++++++++++++++++++++++++++++++++++++++++++++
 drivers/sfi/sfi_core.h   |   63 +++++++
 6 files changed, 804 insertions(+), 0 deletions(-)
 create mode 100644 arch/x86/kernel/sfi.c
 create mode 100644 drivers/sfi/Makefile
 create mode 100644 drivers/sfi/sfi_core.c
 create mode 100644 drivers/sfi/sfi_core.h

diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index 88d1bfc..75042a7 100644
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -50,6 +50,7 @@ obj-y				+= step.o
 obj-$(CONFIG_STACKTRACE)	+= stacktrace.o
 obj-y				+= cpu/
 obj-y				+= acpi/
+obj-$(CONFIG_SFI)		+= sfi.o
 obj-y				+= reboot.o
 obj-$(CONFIG_MCA)		+= mca_32.o
 obj-$(CONFIG_X86_MSR)		+= msr.o
diff --git a/arch/x86/kernel/sfi.c b/arch/x86/kernel/sfi.c
new file mode 100644
index 0000000..d940de2
--- /dev/null
+++ b/arch/x86/kernel/sfi.c
@@ -0,0 +1,335 @@
+/*
+ *  sfi.c - SFI Boot Support (refer acpi/boot.c)
+ *
+ *  Copyright (C) 2008-2009	Intel Corporation
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+#include <linux/init.h>
+#include <linux/efi.h>
+#include <linux/cpumask.h>
+#include <linux/module.h>
+#include <linux/irq.h>
+#include <linux/bootmem.h>
+#include <linux/io.h>
+#include <linux/acpi.h>
+#include <linux/efi.h>
+#include <linux/sfi.h>
+
+#include <asm/pgtable.h>
+#include <asm/io_apic.h>
+#include <asm/apic.h>
+#include <asm/mpspec.h>
+
+#include <asm/e820.h>
+#include <asm/setup.h>
+
+#undef PREFIX
+#define PREFIX "SFI: "
+
+#ifdef CONFIG_X86_LOCAL_APIC
+static u64 sfi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
+#endif
+
+extern int __init sfi_parse_xsdt(struct sfi_table_header *table);
+static int __init sfi_parse_cpus(struct sfi_table_header *table);
+static int __init sfi_parse_apic(struct sfi_table_header *table);
+
+void __init __iomem *
+arch_early_ioremap(unsigned long phys, unsigned long size)
+{
+	return early_ioremap(phys, size);
+}
+
+void __init arch_early_iounmap(void __iomem *virt, unsigned long size)
+{
+	early_iounmap(virt, size);
+}
+
+static ulong __init sfi_early_find_syst(void)
+{
+	unsigned long i;
+	char *pchar = (char *)SFI_SYST_SEARCH_BEGIN;
+
+	for (i = 0; SFI_SYST_SEARCH_BEGIN + i < SFI_SYST_SEARCH_END; i += 16, pchar += 16) {
+		if (!strncmp(SFI_SIG_SYST, pchar, SFI_SIGNATURE_SIZE))
+			return SFI_SYST_SEARCH_BEGIN + i;
+	}
+	return 0;
+}
+
+/*
+ * called in a early boot phase before the paging table is created,
+ * setup a mmap table in e820 format
+ */
+int __init sfi_init_memory_map(void)
+{
+	struct sfi_table_simple *syst, *mmapt;
+	struct sfi_mem_entry *mentry;
+	unsigned long long start, end, size;
+	int i, num, type, tbl_cnt;
+	u64 *pentry;
+
+	if (sfi_disabled)
+		return -1;
+
+	/* first search the syst table */
+	syst = (struct sfi_table_simple *)sfi_early_find_syst();
+	if (!syst)
+		return -1;
+
+	tbl_cnt = (syst->header.length - sizeof(struct sfi_table_header)) / sizeof(u64);
+	pentry = syst->pentry;
+
+	/* walk through the syst to search the mmap table */
+	mmapt = NULL;
+	for (i = 0; i < tbl_cnt; i++) {
+		if (!strncmp(SFI_SIG_MMAP, (char *)(u32)*pentry, 4)) {
+			mmapt = (struct sfi_table_simple *)(u32)*pentry;
+			break;
+		}
+		pentry++;
+	}
+	if (!mmapt)
+		return -1;
+
+	/* refer copy_e820_memory() */
+	num = SFI_GET_ENTRY_NUM(mmapt, sfi_mem_entry);
+	mentry = (struct sfi_mem_entry *)mmapt->pentry;
+	for (i = 0; i < num; i++) {
+		start = mentry->phy_start;
+		size = mentry->pages << PAGE_SHIFT;
+		end = start + size;
+
+		if (start > end)
+			return -1;
+
+		pr_debug(PREFIX "start = 0x%08x end = 0x%08x type = %d\n",
+			(u32)start, (u32)end, mentry->type);
+
+		/* translate SFI mmap type to E820 map type */
+		switch (mentry->type) {
+		case EFI_CONVENTIONAL_MEMORY:
+			type = E820_RAM;
+			break;
+		case EFI_MEMORY_MAPPED_IO:
+		case EFI_UNUSABLE_MEMORY:
+		case EFI_RUNTIME_SERVICES_DATA:
+			mentry++;
+			continue;
+		default:
+			type = E820_RESERVED;
+		}
+
+		e820_add_region(start, size, type);
+		mentry++;
+	}
+
+	return 0;
+}
+
+#ifdef CONFIG_X86_LOCAL_APIC
+void __init mp_sfi_register_lapic_address(u64 address)
+{
+	mp_lapic_addr = (unsigned long) address;
+
+	set_fixmap_nocache(FIX_APIC_BASE, mp_lapic_addr);
+
+	if (boot_cpu_physical_apicid == -1U)
+		boot_cpu_physical_apicid = read_apic_id();
+
+	pr_info(PREFIX "Boot CPU = %d\n", boot_cpu_physical_apicid);
+}
+
+/* All CPUs enumerated by SFI must be present and enabled */
+void __cpuinit mp_sfi_register_lapic(u8 id)
+{
+	struct mpc_cpu cpu;
+	int boot_cpu = 0;
+
+	if (MAX_APICS - id <= 0) {
+		printk(KERN_WARNING "Processor #%d invalid (max %d)\n",
+			id, MAX_APICS);
+		return;
+	}
+
+	if (id == boot_cpu_physical_apicid)
+		boot_cpu = 1;
+
+	cpu.type = MP_PROCESSOR;
+	cpu.apicid = id;
+	cpu.apicver = GET_APIC_VERSION(apic_read(APIC_LVR));
+	cpu.cpuflag = CPU_ENABLED;
+	cpu.cpuflag |= (boot_cpu ? CPU_BOOTPROCESSOR : 0);
+	cpu.cpufeature = (boot_cpu_data.x86 << 8) |
+		(boot_cpu_data.x86_model << 4) | boot_cpu_data.x86_mask;
+	cpu.featureflag = boot_cpu_data.x86_capability[0];
+	cpu.reserved[0] = 0;
+	cpu.reserved[1] = 0;
+
+	generic_processor_info(id, cpu.apicver);
+}
+
+static int __init sfi_parse_cpus(struct sfi_table_header *table)
+{
+	struct sfi_table_simple *sb;
+	struct sfi_cpu_table_entry *pentry;
+	int i;
+	int cpu_num;
+
+	BUG_ON(!table);
+	sb = (struct sfi_table_simple *)table;
+
+	cpu_num = SFI_GET_ENTRY_NUM(sb, sfi_cpu_table_entry);
+	pentry = (struct sfi_cpu_table_entry *) sb->pentry;
+
+	for (i = 0; i < cpu_num; i++) {
+		mp_sfi_register_lapic(pentry->apicid);
+		pentry++;
+	}
+
+	smp_found_config = 1;
+	return 0;
+}
+#endif /* CONFIG_X86_LOCAL_APIC */
+
+#ifdef	CONFIG_X86_IO_APIC
+static struct mp_ioapic_routing {
+	int			apic_id;
+	int			gsi_base;
+	int			gsi_end;
+	u32			pin_programmed[4];
+} mp_ioapic_routing[MAX_IO_APICS];
+
+/* refer acpi/boot.c */
+static u8 __init uniq_ioapic_id(u8 id)
+{
+#ifdef CONFIG_X86_32
+	if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) &&
+	    !APIC_XAPIC(apic_version[boot_cpu_physical_apicid]))
+		return io_apic_get_unique_id(nr_ioapics, id);
+	else
+		return id;
+#else
+	int i;
+	DECLARE_BITMAP(used, 256);
+	bitmap_zero(used, 256);
+	for (i = 0; i < nr_ioapics; i++) {
+		struct mpc_ioapic *ia = &mp_ioapics[i];
+		__set_bit(ia->apicid, used);
+	}
+	if (!test_bit(id, used))
+		return id;
+	return find_first_zero_bit(used, 256);
+#endif
+}
+
+
+void __init mp_sfi_register_ioapic(u8 id, u32 paddr)
+{
+	int idx = 0;
+	int tmpid;
+	static u32 gsi_base;
+
+	if (nr_ioapics >= MAX_IO_APICS) {
+		printk(KERN_ERR "ERROR: Max # of I/O APICs (%d) exceeded "
+			"(found %d)\n", MAX_IO_APICS, nr_ioapics);
+		panic("Recompile kernel with bigger MAX_IO_APICS!\n");
+	}
+	if (!paddr) {
+		printk(KERN_ERR "WARNING: Bogus (zero) I/O APIC address"
+			" found in MADT table, skipping!\n");
+		return;
+	}
+
+	idx = nr_ioapics;
+
+	mp_ioapics[idx].type = MP_IOAPIC;
+	mp_ioapics[idx].flags = MPC_APIC_USABLE;
+	mp_ioapics[idx].apicaddr = paddr;
+
+	set_fixmap_nocache(FIX_IO_APIC_BASE_0 + idx, paddr);
+	tmpid = uniq_ioapic_id(id);
+	if (tmpid == -1)
+		return;
+
+	mp_ioapics[idx].apicid = tmpid;
+#ifdef CONFIG_X86_32
+	mp_ioapics[idx].apicver = io_apic_get_version(idx);
+#else
+	mp_ioapics[idx].apicver = 0;
+#endif
+
+	pr_info(PREFIX "IOAPIC[%d]: apic_id %d, version %d, address 0x%x\n",
+		idx, mp_ioapics[idx].apicid,
+		mp_ioapics[idx].apicver, (u32)mp_ioapics[idx].apicaddr);
+	/*
+	 * Build basic GSI lookup table to facilitate gsi->io_apic lookups
+	 * and to prevent reprogramming of IOAPIC pins (PCI GSIs).
+	 */
+	mp_ioapic_routing[idx].apic_id = mp_ioapics[idx].apicid;
+	mp_ioapic_routing[idx].gsi_base = gsi_base;
+	mp_ioapic_routing[idx].gsi_end = gsi_base +
+		io_apic_get_redir_entries(idx);
+	gsi_base = mp_ioapic_routing[idx].gsi_end + 1;
+	pr_info(PREFIX "IOAPIC[%d]: apic_id %d, version %d, address 0x%x, "
+	       "GSI %d-%d\n", idx, mp_ioapics[idx].apicid,
+	       mp_ioapics[idx].apicver, (u32)mp_ioapics[idx].apicaddr,
+	       mp_ioapic_routing[idx].gsi_base,
+	       mp_ioapic_routing[idx].gsi_end);
+
+	nr_ioapics++;
+}
+
+static int __init sfi_parse_apic(struct sfi_table_header *table)
+{
+	struct sfi_table_simple *sb;
+	struct sfi_apic_table_entry *pentry;
+	int i, num;
+
+	BUG_ON(!table);
+	sb = (struct sfi_table_simple *)table;
+
+	num = SFI_GET_ENTRY_NUM(sb, sfi_apic_table_entry);
+	pentry = (struct sfi_apic_table_entry *) sb->pentry;
+	for (i = 0; i < num; i++) {
+		mp_sfi_register_ioapic(i, pentry->phy_addr);
+		pentry++;
+	}
+
+	WARN_ON(pic_mode);
+	pic_mode = 0;
+	return 0;
+}
+#endif /* CONFIG_X86_IO_APIC */
+
+/*
+ * sfi_platform_init(): register lapics & io-apics
+ */
+int __init sfi_platform_init(void)
+{
+#ifdef CONFIG_X86_LOCAL_APIC
+	mp_sfi_register_lapic_address(sfi_lapic_addr);
+	sfi_table_parse(SFI_SIG_CPUS, NULL, NULL, 0, sfi_parse_cpus);
+#endif
+#ifdef CONFIG_X86_IO_APIC
+	sfi_table_parse(SFI_SIG_APIC, NULL, NULL, 0, sfi_parse_apic);
+#endif
+	return 0;
+}
diff --git a/drivers/Makefile b/drivers/Makefile
index 1266ead..c3e39b5 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -11,6 +11,7 @@ obj-$(CONFIG_PARISC)		+= parisc/
 obj-$(CONFIG_RAPIDIO)		+= rapidio/
 obj-y				+= video/
 obj-$(CONFIG_ACPI)		+= acpi/
+obj-$(CONFIG_SFI)		+= sfi/
 # PnP must come after ACPI since it will eventually need to check if acpi
 # was used and do nothing if so
 obj-$(CONFIG_PNP)		+= pnp/
diff --git a/drivers/sfi/Makefile b/drivers/sfi/Makefile
new file mode 100644
index 0000000..f176470
--- /dev/null
+++ b/drivers/sfi/Makefile
@@ -0,0 +1 @@
+obj-y	+= sfi_core.o
diff --git a/drivers/sfi/sfi_core.c b/drivers/sfi/sfi_core.c
new file mode 100644
index 0000000..0a9b72d
--- /dev/null
+++ b/drivers/sfi/sfi_core.c
@@ -0,0 +1,403 @@
+/* sfi_core.c Simple Firmware Interface - core internals */
+
+/*
+ * Copyright (C) 2009, Intel Corp.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. Redistributions in binary form must reproduce at minimum a disclaimer
+ *    substantially similar to the "NO WARRANTY" disclaimer below
+ *    ("Disclaimer") and any redistribution must be conditioned upon
+ *    including a substantially similar Disclaimer requirement for further
+ *    binary redistribution.
+ * 3. Neither the names of the above-listed copyright holders nor the names
+ *    of any contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ *
+ * NO WARRANTY
+ * 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 MERCHANTIBILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDERS OR CONTRIBUTORS BE LIABLE FOR 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 DAMAGES.
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/smp.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/irq.h>
+#include <linux/errno.h>
+#include <linux/sfi.h>
+#include <linux/bootmem.h>
+#include <linux/module.h>
+#include <asm/pgtable.h>
+#include "sfi_core.h"
+
+#undef PREFIX
+#define PREFIX	"SFI: "
+
+int sfi_disabled;
+EXPORT_SYMBOL(sfi_disabled);
+
+#define SFI_MAX_TABLES		64
+struct sfi_internal_syst sfi_tblist;
+static struct sfi_table_desc sfi_initial_tables[SFI_MAX_TABLES] __initdata;
+
+/*
+ * flag for whether using ioremap() to map the sfi tables, if yes
+ * each table only need be mapped once, otherwise each arch's
+ * early_ioremap  and early_iounmap should be used each time a
+ * table is visited
+ */
+static u32 sfi_tbl_permanant_mapped;
+
+static void __iomem *sfi_map_memory(u32 phys, u32 size)
+{
+	if (!phys || !size)
+		return NULL;
+
+	if (sfi_tbl_permanant_mapped)
+		return ioremap((unsigned long)phys, size);
+	else
+		return arch_early_ioremap((unsigned long)phys, size);
+}
+
+static void sfi_unmap_memory(void __iomem *virt, u32 size)
+{
+	if (!virt || !size)
+		return;
+
+	if (sfi_tbl_permanant_mapped)
+		iounmap(virt);
+	else
+		arch_early_iounmap(virt, size);
+}
+
+static void sfi_print_table_header(u32 address,
+			struct sfi_table_header *header)
+{
+	pr_info(PREFIX
+		"%4.4s %08lX, %04X (r%d %6.6s %8.8s)\n",
+		header->signature, (unsigned long)address,
+		header->length, header->revision, header->oem_id,
+		header->oem_table_id);
+}
+
+static u8 sfi_checksum_table(u8 *buffer, u32 length)
+{
+	u8 sum = 0;
+
+	while (length--)
+		sum += *buffer++;
+	return sum;
+}
+
+/* Verifies if the table checksums is zero */
+static int sfi_tb_verify_checksum(struct sfi_table_header *table, u32 length)
+{
+	u8 checksum;
+
+	checksum = sfi_checksum_table((u8 *)table, length);
+	if (checksum) {
+		pr_warning(PREFIX
+			"Incorrect checksum in table [%4.4s] -  %2.2X,"
+			" should be %2.2X\n", table->signature,
+			table->checksum, (u8)(table->checksum - checksum));
+		return -1;
+	}
+	return 0;
+}
+
+ /* find the right table based on signaure, return the mapped table */
+int sfi_get_table(char *signature, char *oem_id, char *oem_table_id,
+	unsigned int flags, struct sfi_table_header **out_table)
+{
+	struct sfi_table_desc *tdesc;
+	struct sfi_table_header *th;
+	u32 i;
+
+	if (!signature || !out_table)
+		return -1;
+
+	/* Walk the global SFI table list */
+	for (i = 0; i < sfi_tblist.count; i++) {
+		tdesc = &sfi_tblist.tables[i];
+		th = &tdesc->header;
+
+		if ((flags & SFI_ACPI_TABLE) != (tdesc->flags & SFI_ACPI_TABLE))
+			continue;
+
+		if (strncmp(th->signature, signature, SFI_SIGNATURE_SIZE))
+			continue;
+
+		if (oem_id && strncmp(th->oem_id, oem_id, SFI_OEM_ID_SIZE))
+			continue;
+
+		if (oem_table_id && strncmp(th->oem_table_id, oem_table_id,
+			SFI_OEM_TABLE_ID_SIZE))
+			continue;
+
+		if (!tdesc->pointer) {
+			tdesc->pointer = sfi_map_memory(tdesc->address,
+							th->length);
+			if (!tdesc->pointer)
+				return -ENOMEM;
+		}
+		*out_table = tdesc->pointer;
+
+		if (!sfi_tbl_permanant_mapped)
+			tdesc->pointer = NULL;
+
+		return 0;
+	}
+
+	return -1;
+}
+
+void sfi_put_table(struct sfi_table_header *table)
+{
+	if (!sfi_tbl_permanant_mapped)
+		sfi_unmap_memory(table, table->length);
+}
+
+/* find table with signature, run handler on it */
+int sfi_table_parse(char *signature, char *oem_id, char* oem_table_id,
+	unsigned int flags, sfi_table_handler handler)
+{
+	int ret = 0;
+	struct sfi_table_header *table = NULL;
+
+	if (!handler)
+		return -EINVAL;
+
+	sfi_get_table(signature, oem_id, oem_table_id, flags, &table);
+	if (!table)
+		return -1;
+
+	ret = handler(table);
+	sfi_put_table(table);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(sfi_table_parse);
+
+void sfi_tb_install_table(u64 addr, u32 flags)
+{
+	struct sfi_table_header *table;
+	u32 length;
+
+	/* only map table header before knowing actual length */
+	table = sfi_map_memory(addr, sizeof(struct sfi_table_header));
+	if (!table)
+		return;
+
+	length = table->length;
+	sfi_unmap_memory(table, sizeof(struct sfi_table_header));
+
+	table = sfi_map_memory(addr, length);
+	if (!table)
+		return;
+
+	if (sfi_tb_verify_checksum(table, length))
+		goto unmap_and_exit;
+
+	/* Initialize sfi_tblist entry */
+	sfi_tblist.tables[sfi_tblist.count].flags = flags;
+	sfi_tblist.tables[sfi_tblist.count].address = addr;
+	sfi_tblist.tables[sfi_tblist.count].pointer = NULL;
+	memcpy(&sfi_tblist.tables[sfi_tblist.count].header,
+		table, sizeof(struct sfi_table_header));
+
+	sfi_print_table_header(addr, table);
+	sfi_tblist.count++;
+
+unmap_and_exit:
+	sfi_unmap_memory(table, length);
+	return;
+}
+
+/*
+ * Copy system table and associated table headers to internal format
+ */
+static int __init
+sfi_tb_parse_syst(unsigned long syst_addr)
+{
+	struct sfi_table_simple *syst;
+	struct sfi_table_header *table;
+	u64 *paddr;
+	u32 length, tbl_cnt;
+	int status;
+	int i;
+
+	/* 1. map and get the total length of SYST */
+	syst = sfi_map_memory(syst_addr, sizeof(struct sfi_table_simple));
+	if (!syst)
+		return -ENOMEM;
+
+	sfi_print_table_header(syst_addr, (struct sfi_table_header *)syst);
+	table = (struct sfi_table_header *)syst;
+	length = table->length;
+	sfi_unmap_memory(syst, sizeof(struct sfi_table_simple));
+
+	/* 2. remap/verify the SYST and parse the number of entry */
+	syst = sfi_map_memory(syst_addr, length);
+	if (!syst)
+		return -ENOMEM;
+
+	table = (struct sfi_table_header *)syst;
+	status = sfi_tb_verify_checksum(table, length);
+	if (status) {
+		pr_err(PREFIX "SYST checksum error!!\n");
+		sfi_unmap_memory(table, length);
+		return status;
+	}
+
+	/* Calculate the number of tables */
+	tbl_cnt = (length - sizeof(struct sfi_table_header)) / sizeof(u64);
+	paddr = (u64 *) syst->pentry;
+
+	sfi_tblist.count = 1;
+	sfi_tblist.tables[0].address = syst_addr;
+	sfi_tblist.tables[0].pointer = NULL;
+	memcpy(&sfi_tblist.tables[0].header,
+		syst, sizeof(struct sfi_table_header));
+
+	/* 3. save all tables info to the global sfi_tblist structure */
+	for (i = 1; i <= tbl_cnt; i++)
+		sfi_tb_install_table(*paddr++, 0);
+
+	sfi_unmap_memory(syst, length);
+
+	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.
+ */
+static __init unsigned long 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 0;
+
+	for (offset = 0; offset < len; offset += 16) {
+		struct sfi_table_header *syst;
+
+		syst = (struct sfi_table_header *)(start + offset);
+
+		if (strncmp(syst->signature, SFI_SIG_SYST, SFI_SIGNATURE_SIZE))
+				continue;
+
+		if (!sfi_tb_verify_checksum(syst, syst->length)) {
+			sfi_unmap_memory(start, len);
+			return SFI_SYST_SEARCH_BEGIN + offset;
+		}
+	}
+
+	sfi_unmap_memory(start, len);
+	return 0;
+}
+
+int __init sfi_table_init(void)
+{
+	unsigned long syst_paddr;
+	int status;
+
+	/* set up the SFI table array */
+	sfi_tblist.tables = sfi_initial_tables;
+	sfi_tblist.size = SFI_MAX_TABLES;
+
+	syst_paddr = sfi_find_syst();
+	if (!syst_paddr) {
+		pr_warning(PREFIX "No system table\n");
+		goto err_exit;
+	}
+
+	status = sfi_tb_parse_syst(syst_paddr);
+	if (status)
+		goto err_exit;
+
+	return 0;
+err_exit:
+	disable_sfi();
+	return -1;
+}
+
+static void sfi_realloc_tblist(void)
+{
+	int size;
+	struct sfi_table_desc *table;
+
+	size = (sfi_tblist.count + 8) * sizeof(struct sfi_table_desc);
+	table = kzalloc(size, GFP_KERNEL);
+	if (!table) {
+		disable_sfi();
+		return;
+	}
+
+	memcpy(table, sfi_tblist.tables,
+		sfi_tblist.count * sizeof(struct sfi_table_desc));
+	sfi_tblist.tables = table;
+	return;
+}
+
+int __init sfi_init(void)
+{
+	if(!acpi_disabled){
+		disable_sfi();
+		return -1;
+	}
+
+	if(sfi_disabled)
+		return -1;
+
+	pr_info(PREFIX "Simple Firmware Interface v0.5\n");
+
+	if (sfi_table_init())
+		return -1;
+
+	return sfi_platform_init();
+}
+/* after most of the system is up, abandon the static array */
+void __init sfi_init_late(void)
+{
+	if (sfi_disabled)
+		return;
+	sfi_tbl_permanant_mapped = 1;
+	sfi_realloc_tblist();
+}
+
+static int __init sfi_parse_cmdline(char *arg)
+{
+	if (!arg)
+		return -EINVAL;
+
+	if (!strcmp(arg, "off"))
+		sfi_disabled = 1;
+
+	return 0;
+}
+early_param("sfi", sfi_parse_cmdline);
diff --git a/drivers/sfi/sfi_core.h b/drivers/sfi/sfi_core.h
new file mode 100644
index 0000000..36703b0
--- /dev/null
+++ b/drivers/sfi/sfi_core.h
@@ -0,0 +1,63 @@
+/* sfi_core.h Simple Firmware Interface, internal header */
+
+/*
+ * Copyright (C) 2009, Intel Corp.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. Redistributions in binary form must reproduce at minimum a disclaimer
+ *    substantially similar to the "NO WARRANTY" disclaimer below
+ *    ("Disclaimer") and any redistribution must be conditioned upon
+ *    including a substantially similar Disclaimer requirement for further
+ *    binary redistribution.
+ * 3. Neither the names of the above-listed copyright holders nor the names
+ *    of any contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ *
+ * NO WARRANTY
+ * 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 MERCHANTIBILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDERS OR CONTRIBUTORS BE LIABLE FOR 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 DAMAGES.
+ */
+
+struct sfi_table_desc {
+	struct sfi_table_header header;	/* copy of the headef info */
+	struct sfi_table_header *pointer;
+	u64 address;
+	u32 flags;
+};
+
+/* SFI internal root SYSTem table */
+struct sfi_internal_syst {
+	struct sfi_table_desc *tables;
+	u32 count;
+	u32 size;
+};
+
+extern int sfi_get_table(char *signature, char *oem_id, char *oem_table_id,
+	uint flags, struct sfi_table_header **out_table);
+extern void sfi_put_table(struct sfi_table_header *table);
+
+extern int sfi_acpi_init(void);
+extern struct sfi_internal_syst sfi_tblist;
+void sfi_tb_install_table(u64 address, u32 flags);
+
+#define SFI_ACPI_TABLE	1
+
-- 
1.6.0.6

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