ACPI: Re-add acpitable.c and acpismp=force. This improves backwards compatibility

and also cleans up the code to a significant degree.

arch/i386/kernel/acpi/Makefile

+obj-$(CONFIG_ACPI_HT_ONLY)	:= acpitable.o
 obj-$(CONFIG_ACPI_BOOT)		:= boot.o
 obj-$(CONFIG_ACPI_SLEEP)	+= sleep.o wakeup.o
 

arch/i386/kernel/acpi/acpitable.c

+/*
+ *  acpitable.c - IA32-specific ACPI boot-time initialization (Revision: 1)
+ *
+ *  Copyright (C) 1999 Andrew Henroid
+ *  Copyright (C) 2001 Richard Schaal
+ *  Copyright (C) 2001 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
+ *  Copyright (C) 2001 Jun Nakajima <jun.nakajima@intel.com>
+ *  Copyright (C) 2001 Arjan van de Ven <arjanv@redhat.com>
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ *  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
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * $Id: acpitable.c,v 1.7 2001/11/04 12:21:18 fenrus Exp $
+ */
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/stddef.h>
+#include <linux/slab.h>
+#include <linux/pci.h>
+#include <asm/mpspec.h>
+#include <asm/io.h>
+#include <asm/apic.h>
+#include <asm/apicdef.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+
+#include "acpitable.h"
+
+static acpi_table_handler acpi_boot_ops[ACPI_TABLE_COUNT];
+
+int acpi_lapic;
+
+static unsigned char __init
+acpi_checksum(void *buffer, int length)
+{
+	int i;
+	unsigned char *bytebuffer;
+	unsigned char sum = 0;
+
+	if (!buffer || length <= 0)
+		return 0;
+
+	bytebuffer = (unsigned char *) buffer;
+
+	for (i = 0; i < length; i++)
+		sum += *(bytebuffer++);
+
+	return sum;
+}
+
+static void __init
+acpi_print_table_header(acpi_table_header * header)
+{
+	if (!header)
+		return;
+
+	printk(KERN_INFO "ACPI table found: %.4s v%d [%.6s %.8s %d.%d]\n",
+	       header->signature, header->revision, header->oem_id,
+	       header->oem_table_id, header->oem_revision >> 16,
+	       header->oem_revision & 0xffff);
+
+	return;
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_tb_scan_memory_for_rsdp
+ *
+ * PARAMETERS:  address       - Starting pointer for search
+ *              length        - Maximum length to search
+ *
+ * RETURN:      Pointer to the RSDP if found and valid, otherwise NULL.
+ *
+ * DESCRIPTION: Search a block of memory for the RSDP signature
+ *
+ ******************************************************************************/
+
+static void *__init
+acpi_tb_scan_memory_for_rsdp(void *address, int length)
+{
+	u32 offset;
+
+	if (length <= 0)
+		return NULL;
+
+	/* Search from given start addr for the requested length  */
+
+	offset = 0;
+
+	while (offset < length) {
+		/* The signature must match and the checksum must be correct */
+		if (strncmp(address, RSDP_SIG, sizeof(RSDP_SIG) - 1) == 0 &&
+		    acpi_checksum(address, RSDP_CHECKSUM_LENGTH) == 0) {
+			/* If so, we have found the RSDP */
+			printk(KERN_INFO "ACPI: RSDP located at physical address %p\n",
+			       address);
+			return address;
+		}
+		offset += RSDP_SCAN_STEP;
+		address += RSDP_SCAN_STEP;
+	}
+
+	/* Searched entire block, no RSDP was found */
+	printk(KERN_INFO "ACPI: Searched entire block, no RSDP was found.\n");
+	return NULL;
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_find_root_pointer
+ *
+ * PARAMETERS:  none
+ *
+ * RETURN:      physical address of the RSDP 
+ *
+ * DESCRIPTION: Search lower 1_mbyte of memory for the root system descriptor
+ *              pointer structure.  If it is found, set *RSDP to point to it.
+ *
+ *              NOTE: The RSDP must be either in the first 1_k of the Extended
+ *              BIOS Data Area or between E0000 and FFFFF (ACPI 1.0 section
+ *              5.2.2; assertion #421).
+ *
+ ******************************************************************************/
+
+static struct acpi_table_rsdp * __init
+acpi_find_root_pointer(void)
+{
+	struct acpi_table_rsdp * rsdp;
+
+	/*
+	 * Physical address is given
+	 */
+	/*
+	 * Region 1) Search EBDA (low memory) paragraphs
+	 */
+	rsdp = acpi_tb_scan_memory_for_rsdp(__va(LO_RSDP_WINDOW_BASE),
+					 LO_RSDP_WINDOW_SIZE);
+
+	if (rsdp)
+		return rsdp;
+
+	/*
+	 * Region 2) Search upper memory: 16-byte boundaries in E0000h-F0000h
+	 */
+	rsdp = acpi_tb_scan_memory_for_rsdp(__va(HI_RSDP_WINDOW_BASE),
+					       HI_RSDP_WINDOW_SIZE);
+
+	
+					     
+	if (rsdp)
+		return rsdp;
+
+	printk(KERN_ERR "ACPI: System description tables not found\n");
+	return NULL;
+}
+
+
+/*
+ * Temporarily use the virtual area starting from FIX_IO_APIC_BASE_END,
+ * to map the target physical address. The problem is that set_fixmap()
+ * provides a single page, and it is possible that the page is not
+ * sufficient.
+ * By using this area, we can map up to MAX_IO_APICS pages temporarily,
+ * i.e. until the next __va_range() call.
+ *
+ * Important Safety Note:  The fixed I/O APIC page numbers are *subtracted*
+ * from the fixed base.  That's why we start at FIX_IO_APIC_BASE_END and
+ * count idx down while incrementing the phys address.
+ */
+static __init char *
+__va_range(unsigned long phys, unsigned long size)
+{
+	unsigned long base, offset, mapped_size;
+	int idx;
+
+	offset = phys & (PAGE_SIZE - 1);
+	mapped_size = PAGE_SIZE - offset;
+	set_fixmap(FIX_IO_APIC_BASE_END, phys);
+	base = fix_to_virt(FIX_IO_APIC_BASE_END);
+	dprintk("__va_range(0x%lx, 0x%lx): idx=%d mapped at %lx\n", phys, size,
+		FIX_IO_APIC_BASE_END, base);
+
+	/*
+	 * Most cases can be covered by the below.
+	 */
+	idx = FIX_IO_APIC_BASE_END;
+	while (mapped_size < size) {
+		if (--idx < FIX_IO_APIC_BASE_0)
+			return 0;	/* cannot handle this */
+		phys += PAGE_SIZE;
+		set_fixmap(idx, phys);
+		mapped_size += PAGE_SIZE;
+	}
+
+	return ((unsigned char *) base + offset);
+}
+
+static int __init acpi_tables_init(void)
+{
+	int result = -ENODEV;
+	acpi_table_header *header = NULL;
+	struct acpi_table_rsdp *rsdp = NULL;
+	struct acpi_table_rsdt *rsdt = NULL;
+	struct acpi_table_rsdt saved_rsdt;
+	int tables = 0;
+	int type = 0;
+	int i = 0;
+
+
+	rsdp = (struct acpi_table_rsdp *) acpi_find_root_pointer();
+
+	if (!rsdp)
+		return -ENODEV;
+		
+	printk(KERN_INFO "%.8s v%d [%.6s]\n", rsdp->signature, rsdp->revision,
+	       rsdp->oem_id);
+	       
+	if (strncmp(rsdp->signature, RSDP_SIG,strlen(RSDP_SIG))) {
+		printk(KERN_WARNING "RSDP table signature incorrect\n");
+		return -EINVAL;
+	}
+
+	rsdt = (struct acpi_table_rsdt *)
+	    __va_range(rsdp->rsdt_address, sizeof(struct acpi_table_rsdt));
+
+	if (!rsdt) {
+		printk(KERN_WARNING "ACPI: Invalid root system description tables (RSDT)\n");
+		return -ENODEV;
+	}
+	
+	header = & rsdt->header;
+	acpi_print_table_header(header);
+	
+	if (strncmp(header->signature, RSDT_SIG, strlen(RSDT_SIG))) {
+		printk(KERN_WARNING "ACPI: RSDT signature incorrect\n");
+		return -ENODEV;
+	}
+		
+	/* 
+	 * The number of tables is computed by taking the 
+	 * size of all entries (header size minus total 
+	 * size of RSDT) divided by the size of each entry
+	 * (4-byte table pointers).
+	 */
+	tables = (header->length - sizeof(acpi_table_header)) / 4;
+		    
+	memcpy(&saved_rsdt, rsdt, sizeof(saved_rsdt));
+
+	if (saved_rsdt.header.length > sizeof(saved_rsdt)) {
+		printk(KERN_WARNING "ACPI: Too big length in RSDT: %d\n", saved_rsdt.header.length);
+		return -ENODEV;
+	}
+
+	for (i = 0; i < tables; i++) {
+		/* Map in header, then map in full table length. */
+		header = (acpi_table_header *)
+			    __va_range(saved_rsdt.entry[i],
+				       sizeof(acpi_table_header));
+		if (!header)
+			break;
+		header = (acpi_table_header *)
+			    __va_range(saved_rsdt.entry[i], header->length);
+		if (!header)
+			break;
+
+		acpi_print_table_header(header);
+		
+		if (acpi_checksum(header,header->length)) {
+			printk(KERN_WARNING "ACPI %s has invalid checksum\n", 
+				acpi_table_signatures[i]);
+			continue;
+		}
+		
+		for (type = 0; type < ACPI_TABLE_COUNT; type++)
+			if (!strncmp((char *) &header->signature,
+			     acpi_table_signatures[type],strlen(acpi_table_signatures[type])))
+				break;
+
+		if (type >= ACPI_TABLE_COUNT) {
+			printk(KERN_WARNING "ACPI: Unsupported table %.4s\n",
+			       header->signature);
+			continue;
+		}
+
+
+		if (!acpi_boot_ops[type])
+			continue;
+			
+		result = acpi_boot_ops[type] (header,
+						 (unsigned long) saved_rsdt.
+						 entry[i]);
+	}
+
+	return result;
+}
+
+static int total_cpus __initdata = 0;
+int have_acpi_tables;
+
+extern void __init MP_processor_info(struct mpc_config_processor *);
+
+static void __init
+acpi_parse_lapic(struct acpi_table_lapic *local_apic)
+{
+	struct mpc_config_processor proc_entry;
+	int ix = 0;
+
+	if (!local_apic)
+		return;
+
+	printk(KERN_INFO "LAPIC (acpi_id[0x%04x] id[0x%x] enabled[%d])\n",
+		local_apic->acpi_id, local_apic->id, local_apic->flags.enabled);
+
+	printk(KERN_INFO "CPU %d (0x%02x00)", total_cpus, local_apic->id);
+
+	if (local_apic->flags.enabled) {
+		printk(" enabled");
+		ix = local_apic->id;
+		if (ix >= MAX_APICS) {
+			printk(KERN_WARNING
+			       "Processor #%d INVALID - (Max ID: %d).\n", ix,
+			       MAX_APICS);
+			return;
+		}
+		/* 
+		 * Fill in the info we want to save.  Not concerned about 
+		 * the processor ID.  Processor features aren't present in 
+		 * the table.
+		 */
+		proc_entry.mpc_type = MP_PROCESSOR;
+		proc_entry.mpc_apicid = local_apic->id;
+		proc_entry.mpc_cpuflag = CPU_ENABLED;
+		if (proc_entry.mpc_apicid == boot_cpu_physical_apicid) {
+			printk(" (BSP)");
+			proc_entry.mpc_cpuflag |= CPU_BOOTPROCESSOR;
+		}
+		proc_entry.mpc_cpufeature =
+		    (boot_cpu_data.x86 << 8) | 
+		    (boot_cpu_data.x86_model << 4) | 
+		     boot_cpu_data.x86_mask;
+		proc_entry.mpc_featureflag = boot_cpu_data.x86_capability[0];
+		proc_entry.mpc_reserved[0] = 0;
+		proc_entry.mpc_reserved[1] = 0;
+		proc_entry.mpc_apicver = 0x10;	/* integrated APIC */
+		MP_processor_info(&proc_entry);
+	} else {
+		printk(" disabled");
+	}
+	printk("\n");
+
+	total_cpus++;
+	return;
+}
+
+static void __init
+acpi_parse_ioapic(struct acpi_table_ioapic *ioapic)
+{
+
+	if (!ioapic)
+		return;
+
+	printk(KERN_INFO
+	       "IOAPIC (id[0x%x] address[0x%x] global_irq_base[0x%x])\n",
+	       ioapic->id, ioapic->address, ioapic->global_irq_base);
+
+	if (nr_ioapics >= MAX_IO_APICS) {
+		printk(KERN_WARNING
+		       "Max # of I/O APICs (%d) exceeded (found %d).\n",
+		       MAX_IO_APICS, nr_ioapics);
+/*		panic("Recompile kernel with bigger MAX_IO_APICS!\n");   */
+	}
+}
+
+
+/* Interrupt source overrides inform the machine about exceptions
+   to the normal "PIC" mode interrupt routing */
+   
+static void __init
+acpi_parse_int_src_ovr(struct acpi_table_int_src_ovr *intsrc)
+{
+	if (!intsrc)
+		return;
+
+	printk(KERN_INFO
+	       "INT_SRC_OVR (bus[%d] irq[0x%x] global_irq[0x%x] polarity[0x%x] trigger[0x%x])\n",
+	       intsrc->bus, intsrc->bus_irq, intsrc->global_irq,
+	       intsrc->flags.polarity, intsrc->flags.trigger);
+}
+
+/*
+ * At this point, we look at the interrupt assignment entries in the MPS
+ * table.
+ */ 
+ 
+static void __init acpi_parse_nmi_src(struct acpi_table_nmi_src *nmisrc)
+{
+	if (!nmisrc)
+		return;
+
+	printk(KERN_INFO
+	       "NMI_SRC (polarity[0x%x] trigger[0x%x] global_irq[0x%x])\n",
+	       nmisrc->flags.polarity, nmisrc->flags.trigger,
+	       nmisrc->global_irq);
+
+}
+static void __init
+acpi_parse_lapic_nmi(struct acpi_table_lapic_nmi *localnmi)
+{
+	if (!localnmi)
+		return;
+
+	printk(KERN_INFO
+	       "LAPIC_NMI (acpi_id[0x%04x] polarity[0x%x] trigger[0x%x] lint[0x%x])\n",
+	       localnmi->acpi_id, localnmi->flags.polarity,
+	       localnmi->flags.trigger, localnmi->lint);
+}
+static void __init
+acpi_parse_lapic_addr_ovr(struct acpi_table_lapic_addr_ovr *lapic_addr_ovr)
+{
+	if (!lapic_addr_ovr)
+		return;
+
+	printk(KERN_INFO "LAPIC_ADDR_OVR (address[0x%lx])\n",
+	       (unsigned long) lapic_addr_ovr->address);
+
+}
+
+static void __init
+acpi_parse_plat_int_src(struct acpi_table_plat_int_src *plintsrc)
+{
+	if (!plintsrc)
+		return;
+
+	printk(KERN_INFO
+	       "PLAT_INT_SRC (polarity[0x%x] trigger[0x%x] type[0x%x] id[0x%04x] eid[0x%x] iosapic_vector[0x%x] global_irq[0x%x]\n",
+	       plintsrc->flags.polarity, plintsrc->flags.trigger,
+	       plintsrc->type, plintsrc->id, plintsrc->eid,
+	       plintsrc->iosapic_vector, plintsrc->global_irq);
+}
+static int __init
+acpi_parse_madt(acpi_table_header * header, unsigned long phys)
+{
+
+	struct acpi_table_madt *madt;	    
+	acpi_madt_entry_header *entry_header;
+	int table_size;
+	
+	madt = (struct acpi_table_madt *) __va_range(phys, header->length);
+
+	if (!madt)
+		return -EINVAL;
+
+	table_size = (int) (header->length - sizeof(*madt));
+	entry_header =
+	    (acpi_madt_entry_header *) ((void *) madt + sizeof(*madt));
+
+	while (entry_header && (table_size > 0)) {
+		switch (entry_header->type) {
+		case ACPI_MADT_LAPIC:
+			acpi_parse_lapic((struct acpi_table_lapic *)
+					 entry_header);
+			break;
+		case ACPI_MADT_IOAPIC:
+			acpi_parse_ioapic((struct acpi_table_ioapic *)
+					  entry_header);
+			break;
+		case ACPI_MADT_INT_SRC_OVR:
+			acpi_parse_int_src_ovr((struct acpi_table_int_src_ovr *)
+					       entry_header);
+			break;
+		case ACPI_MADT_NMI_SRC:
+			acpi_parse_nmi_src((struct acpi_table_nmi_src *)
+					   entry_header);
+			break;
+		case ACPI_MADT_LAPIC_NMI:
+			acpi_parse_lapic_nmi((struct acpi_table_lapic_nmi *)
+					     entry_header);
+			break;
+		case ACPI_MADT_LAPIC_ADDR_OVR:
+			acpi_parse_lapic_addr_ovr((struct
+						   acpi_table_lapic_addr_ovr *)
+						  entry_header);
+			break;
+		case ACPI_MADT_PLAT_INT_SRC:
+			acpi_parse_plat_int_src((struct acpi_table_plat_int_src
+						 *) entry_header);
+			break;
+		default:
+			printk(KERN_WARNING
+			       "Unsupported MADT entry type 0x%x\n",
+			       entry_header->type);
+			break;
+		}
+		table_size -= entry_header->length;
+		entry_header =
+		    (acpi_madt_entry_header *) ((void *) entry_header +
+						entry_header->length);
+	}
+
+	if (!total_cpus) {
+		printk("ACPI: No Processors found in the APCI table.\n");
+		return -EINVAL;
+	}
+
+	printk(KERN_INFO "%d CPUs total\n", total_cpus);
+
+	if (madt->lapic_address)
+		mp_lapic_addr = madt->lapic_address;
+	else
+		mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
+
+	printk(KERN_INFO "Local APIC address %x\n", madt->lapic_address);
+
+	return 0;
+}
+
+
+/*
+ * Configure the processor info using MADT in the ACPI tables. If we fail to
+ * configure that, then we use the MPS tables.
+ */
+void __init
+acpi_boot_init(void)
+{
+
+	memset(&acpi_boot_ops, 0, sizeof(acpi_boot_ops));
+	acpi_boot_ops[ACPI_APIC] = acpi_parse_madt;
+
+	/*
+	 * Only do this when requested, either because of CPU/Bios type or from the command line
+	 */
+
+	if (!acpi_tables_init())
+		acpi_lapic = 1;
+}
+

arch/i386/kernel/acpi/acpitable.h

+/*
+ *  acpitable.c - IA32-specific ACPI boot-time initialization (Revision: 1)
+ *
+ *  Copyright (C) 1999 Andrew Henroid
+ *  Copyright (C) 2001 Richard Schaal
+ *  Copyright (C) 2001 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
+ *  Copyright (C) 2001 Jun Nakajima <jun.nakajima@intel.com>
+ *  Copyright (C) 2001 Arjan van de Ven <arjanv@redhat.com>
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ *  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
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * $Id: acpitable.h,v 1.3 2001/11/03 22:41:34 fenrus Exp $
+ */
+
+/*
+ * The following codes are cut&pasted from drivers/acpi. Part of the code
+ * there can be not updated or delivered yet.
+ * To avoid conflicts when CONFIG_ACPI is defined, the following codes are
+ * modified so that they are self-contained in this file.
+ * -- jun
+ */
+ 
+#ifndef _HEADER_ACPITABLE_H_
+#define _HEADER_ACPITABLE_H_
+
+#define dprintk printk
+typedef unsigned int ACPI_TBLPTR;
+
+typedef struct {		/* ACPI common table header */
+	char signature[4];	/* identifies type of table */
+	u32 length;		/* length of table,
+				   in bytes, * including header */
+	u8 revision;		/* specification minor version # */
+	u8 checksum;		/* to make sum of entire table == 0 */
+	char oem_id[6];		/* OEM identification */
+	char oem_table_id[8];	/* OEM table identification */
+	u32 oem_revision;	/* OEM revision number */
+	char asl_compiler_id[4];	/* ASL compiler vendor ID */
+	u32 asl_compiler_revision;	/* ASL compiler revision number */
+} acpi_table_header __attribute__ ((packed));;
+
+enum {
+	ACPI_APIC = 0,
+	ACPI_BOOT,
+	ACPI_DBGP,
+	ACPI_DSDT,
+	ACPI_ECDT,
+	ACPI_ETDT,
+	ACPI_FACP,
+	ACPI_FACS,
+	ACPI_OEMX,
+	ACPI_PSDT,
+	ACPI_SBST,
+	ACPI_SLIT,
+	ACPI_SPCR,
+	ACPI_SRAT,
+	ACPI_SSDT,
+	ACPI_SPMI,
+	ACPI_XSDT,
+	ACPI_TABLE_COUNT
+};
+
+static char *acpi_table_signatures[ACPI_TABLE_COUNT] = {
+	"APIC",
+	"BOOT",
+	"DBGP",
+	"DSDT",
+	"ECDT",
+	"ETDT",
+	"FACP",
+	"FACS",
+	"OEM",
+	"PSDT",
+	"SBST",
+	"SLIT",
+	"SPCR",
+	"SRAT",
+	"SSDT",
+	"SPMI",
+	"XSDT"
+};
+
+struct acpi_table_madt {
+	acpi_table_header header;
+	u32 lapic_address;
+	struct {
+		u32 pcat_compat:1;
+		u32 reserved:31;
+	} flags __attribute__ ((packed));
+} __attribute__ ((packed));;
+
+enum {
+	ACPI_MADT_LAPIC = 0,
+	ACPI_MADT_IOAPIC,
+	ACPI_MADT_INT_SRC_OVR,
+	ACPI_MADT_NMI_SRC,
+	ACPI_MADT_LAPIC_NMI,
+	ACPI_MADT_LAPIC_ADDR_OVR,
+	ACPI_MADT_IOSAPIC,
+	ACPI_MADT_LSAPIC,
+	ACPI_MADT_PLAT_INT_SRC,
+	ACPI_MADT_ENTRY_COUNT
+};
+
+#define RSDP_SIG			"RSD PTR "
+#define RSDT_SIG 			"RSDT"
+
+#define ACPI_DEBUG_PRINT(pl)
+
+#define ACPI_MEMORY_MODE                0x01
+#define ACPI_LOGICAL_ADDRESSING         0x00
+#define ACPI_PHYSICAL_ADDRESSING        0x01
+
+#define LO_RSDP_WINDOW_BASE         	0	/* Physical Address */
+#define HI_RSDP_WINDOW_BASE         	0xE0000	/* Physical Address */
+#define LO_RSDP_WINDOW_SIZE         	0x400
+#define HI_RSDP_WINDOW_SIZE         	0x20000
+#define RSDP_SCAN_STEP			16
+#define RSDP_CHECKSUM_LENGTH		20
+
+typedef int (*acpi_table_handler) (acpi_table_header * header, unsigned long);
+
+struct acpi_table_rsdp {
+	char signature[8];
+	u8 checksum;
+	char oem_id[6];
+	u8 revision;
+	u32 rsdt_address;
+} __attribute__ ((packed));
+
+struct acpi_table_rsdt {
+	acpi_table_header header;
+	u32 entry[ACPI_TABLE_COUNT];
+} __attribute__ ((packed));
+
+typedef struct {
+	u8 type;
+	u8 length;
+} acpi_madt_entry_header __attribute__ ((packed));
+
+typedef struct {
+	u16 polarity:2;
+	u16 trigger:2;
+	u16 reserved:12;
+} acpi_madt_int_flags __attribute__ ((packed));
+
+struct acpi_table_lapic {
+	acpi_madt_entry_header header;
+	u8 acpi_id;
+	u8 id;
+	struct {
+		u32 enabled:1;
+		u32 reserved:31;
+	} flags __attribute__ ((packed));
+} __attribute__ ((packed));
+
+struct acpi_table_ioapic {
+	acpi_madt_entry_header header;
+	u8 id;
+	u8 reserved;
+	u32 address;
+	u32 global_irq_base;
+} __attribute__ ((packed));
+
+struct acpi_table_int_src_ovr {
+	acpi_madt_entry_header header;
+	u8 bus;
+	u8 bus_irq;
+	u32 global_irq;
+	acpi_madt_int_flags flags;
+} __attribute__ ((packed));
+
+struct acpi_table_nmi_src {
+	acpi_madt_entry_header header;
+	acpi_madt_int_flags flags;
+	u32 global_irq;
+} __attribute__ ((packed));
+
+struct acpi_table_lapic_nmi {
+	acpi_madt_entry_header header;
+	u8 acpi_id;
+	acpi_madt_int_flags flags;
+	u8 lint;
+} __attribute__ ((packed));
+
+struct acpi_table_lapic_addr_ovr {
+	acpi_madt_entry_header header;
+	u8 reserved[2];
+	u64 address;
+} __attribute__ ((packed));
+
+struct acpi_table_iosapic {
+	acpi_madt_entry_header header;
+	u8 id;
+	u8 reserved;
+	u32 global_irq_base;
+	u64 address;
+} __attribute__ ((packed));
+
+struct acpi_table_lsapic {
+	acpi_madt_entry_header header;
+	u8 acpi_id;
+	u8 id;
+	u8 eid;
+	u8 reserved[3];
+	struct {
+		u32 enabled:1;
+		u32 reserved:31;
+	} flags;
+} __attribute__ ((packed));
+
+struct acpi_table_plat_int_src {
+	acpi_madt_entry_header header;
+	acpi_madt_int_flags flags;
+	u8 type;
+	u8 id;
+	u8 eid;
+	u8 iosapic_vector;
+	u32 global_irq;
+	u32 reserved;
+} __attribute__ ((packed));
+
+/*
+ * ACPI Table Descriptor.  One per ACPI table
+ */
+typedef struct acpi_table_desc {
+	struct acpi_table_desc *prev;
+	struct acpi_table_desc *next;
+	struct acpi_table_desc *installed_desc;
+	acpi_table_header *pointer;
+	void *base_pointer;
+	u8 *aml_pointer;
+	u64 physical_address;
+	u32 aml_length;
+	u32 length;
+	u32 count;
+	u16 table_id;
+	u8 type;
+	u8 allocation;
+	u8 loaded_into_namespace;
+
+} acpi_table_desc __attribute__ ((packed));;
+
+#endif

arch/i386/kernel/setup.c

@@ -61,7 +61,11 @@ struct cpuinfo_x86 boot_cpu_data = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
 unsigned long mmu_cr4_features;
 EXPORT_SYMBOL_GPL(mmu_cr4_features);
 
+#ifdef CONFIG_ACPI_HT_ONLY
+int acpi_disabled __initdata = 1;
+#else
 int acpi_disabled __initdata = 0;
+#endif
 
 int MCA_bus;
 /* for MCA, but anyone else can use it if they want */
@@ -515,6 +519,10 @@ static void __init parse_cmdline_early (char ** cmdline_p)
 		if (c == ' ' && !memcmp(from, "acpi=off", 8))
 			acpi_disabled = 1;
 
+		/* "acpismp=force" turns on ACPI again */
+		else if (!memcmp(from, "acpismp=force", 14))
+			acpi_disabled = 0;
+
 		/*
 		 * highmem=size forces highmem to be exactly 'size' bytes.
 		 * This works even on boxes that have no highmem otherwise.

drivers/acpi/Kconfig

@@ -54,7 +54,7 @@ config ACPI_HT_ONLY
 
 config ACPI_BOOT
 	bool
-	depends on IA64 && (!IA64_HP_SIM || IA64_SGI_SN) || X86 && ACPI && !ACPI_HT_ONLY || X86 && ACPI
+	depends on IA64 && (!IA64_HP_SIM || IA64_SGI_SN) || X86 && ACPI && !ACPI_HT_ONLY
 	default y
 
 config ACPI_SLEEP

include/asm-i386/acpi.h

@@ -106,6 +106,10 @@
         :"0"(n_hi), "1"(n_lo))
 
 
+#ifdef CONFIG_ACPI_HT_ONLY
+extern int acpi_lapic;
+#define acpi_ioapic 0
+#else
 #ifndef CONFIG_ACPI_BOOT
 #define acpi_lapic 0
 #define acpi_ioapic 0
@@ -120,6 +124,7 @@ extern int acpi_ioapic;
 #else
 #define acpi_ioapic 0
 #endif
+#endif
 
 /* Fixmap pages to reserve for ACPI boot-time tables (see fixmap.h) */
 #define FIX_ACPI_PAGES 4