ACPI from 2.4:

build: add ACPI_HT, delete ACPI_HT_ONLY
boot: add acpi={force, off, ht}; delete "noht", "acpismp="
add DMI blacklist from UnitedLinux

19 files changed, 460 insertions, 932 deletions

diff --git a/Documentation/kbuild/kconfig-language.txt b/Documentation/kbuild/kconfig-language.txt
index 40f85832e8b8..2a6cc95ddbda 100644
--- a/Documentation/kbuild/kconfig-language.txt
+++ b/Documentation/kbuild/kconfig-language.txt
@@ -124,8 +124,8 @@ module state. Dependency expressions have the following syntax:
            <symbol> '!=' <symbol>               (3)
            '(' <expr> ')'                       (4)
            '!' <expr>                           (5)
-           <expr> '||' <expr>                   (6)
-           <expr> '&&' <expr>                   (7)
+           <expr> '&&' <expr>                   (6)
+           <expr> '||' <expr>                   (7)
 
 Expressions are listed in decreasing order of precedence. 
 
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 65032996a28c..6ea66bbf018f 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -85,13 +85,10 @@ running once the system is up.
 			See also Documentation/scsi/ncr53c7xx.txt.
 
 	acpi=		[HW,ACPI] Advanced Configuration and Power Interface 
-			Format: off
-			off -- disables both ACPI table parsing and interpreter init
-			See also Documentation/pm.txt.
-
-	acpismp=	[IA-32] Early setup parse and use ACPI SMP table.
-			Format: force
-			force -- force use of ACPI table parsing and interpreter init
+			Format: { force | off | ht }
+			force -- enables ACPI for systems with default off
+			off -- disabled ACPI for systems with default on
+			ht -- run only enough ACPI to enable Hyper Threading
 			See also Documentation/pm.txt.
  
 	ad1816=		[HW,OSS]
@@ -619,8 +616,6 @@ running once the system is up.
 			instruction doesn't work correctly and not to
 			use it.
 
-	noht		[SMP,IA-32] Disables P4 Xeon(tm) HyperThreading.
-
 	noirqdebug	[IA-32] Disables the code which attempts to detect and
 			disable unhandled interrupt sources.
 
diff --git a/arch/i386/Kconfig b/arch/i386/Kconfig
index 95867bf35bea..8e1af735b40c 100644
--- a/arch/i386/Kconfig
+++ b/arch/i386/Kconfig
@@ -851,8 +851,11 @@ config SOFTWARE_SUSPEND
 
 source "drivers/acpi/Kconfig"
 
+menu "APM (Advanced Power Management) BIOS Support"
+depends on PM
+
 config APM
-	tristate "Advanced Power Management BIOS support"
+	tristate "APM (Advanced Power Management) BIOS support"
 	depends on PM
 	---help---
 	  APM is a BIOS specification for saving power using several different
@@ -996,6 +999,8 @@ config APM_REAL_MODE_POWER_OFF
 	  a work-around for a number of buggy BIOSes. Switch this option on if
 	  your computer crashes instead of powering off properly.
 
+endmenu
+
 source "arch/i386/kernel/cpu/cpufreq/Kconfig"
 
 endmenu
diff --git a/arch/i386/kernel/acpi/Makefile b/arch/i386/kernel/acpi/Makefile
index 41f9b6fa4987..2cf76a941847 100644
--- a/arch/i386/kernel/acpi/Makefile
+++ b/arch/i386/kernel/acpi/Makefile
@@ -1,4 +1,3 @@
-obj-$(CONFIG_ACPI_HT_ONLY)	:= acpitable.o
 obj-$(CONFIG_ACPI_BOOT)		:= boot.o
 obj-$(CONFIG_ACPI_SLEEP)	+= sleep.o wakeup.o
 
diff --git a/arch/i386/kernel/acpi/acpitable.c b/arch/i386/kernel/acpi/acpitable.c
deleted file mode 100644
index ebcde5af1b72..000000000000
--- a/arch/i386/kernel/acpi/acpitable.c
+++ /dev/null
@@ -1,553 +0,0 @@
-/*
- *  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;
-}
-
diff --git a/arch/i386/kernel/acpi/acpitable.h b/arch/i386/kernel/acpi/acpitable.h
deleted file mode 100644
index ddf1c84a6549..000000000000
--- a/arch/i386/kernel/acpi/acpitable.h
+++ /dev/null
@@ -1,260 +0,0 @@
-/*
- *  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
diff --git a/arch/i386/kernel/acpi/boot.c b/arch/i386/kernel/acpi/boot.c
index 899c1784c14b..d0869a595a61 100644
--- a/arch/i386/kernel/acpi/boot.c
+++ b/arch/i386/kernel/acpi/boot.c
@@ -39,6 +39,7 @@
 #define PREFIX			"ACPI: "
 
 extern int acpi_disabled;
+extern int acpi_ht;
 
 /* --------------------------------------------------------------------------
                               Boot-time Configuration
@@ -157,7 +158,7 @@ acpi_parse_lapic_addr_ovr (
 	return 0;
 }
 
-#ifndef CONFIG_ACPI_HT_ONLY
+#ifdef CONFIG_ACPI
 
 static int __init
 acpi_parse_lapic_nmi (
@@ -177,7 +178,7 @@ acpi_parse_lapic_nmi (
 	return 0;
 }
 
-#endif /*CONFIG_ACPI_HT_ONLY*/
+#endif /*CONFIG_ACPI*/
 
 #endif /*CONFIG_X86_LOCAL_APIC*/
 
@@ -185,7 +186,7 @@ acpi_parse_lapic_nmi (
 
 int acpi_ioapic;
 
-#ifndef CONFIG_ACPI_HT_ONLY
+#ifdef CONFIG_ACPI
 
 static int __init
 acpi_parse_ioapic (
@@ -247,7 +248,7 @@ acpi_parse_nmi_src (
 	return 0;
 }
 
-#endif /*!CONFIG_ACPI_HT_ONLY*/ 
+#endif /*CONFIG_ACPI*/ 
 #endif /*CONFIG_X86_IO_APIC*/
 
 
@@ -289,12 +290,34 @@ acpi_find_rsdp (void)
 	return rsdp_phys;
 }
 
+/*
+ * acpi_boot_init()
+ *  called from setup_arch(), always.
+ *	1. maps ACPI tables for later use
+ *	2. enumerates lapics
+ *	3. enumerates io-apics
+ *
+ * side effects:
+ *	acpi_lapic = 1 if LAPIC found
+ *	acpi_ioapic = 1 if IOAPIC found
+ *	if (acpi_lapic && acpi_ioapic) smp_found_config = 1;
+ *	if acpi_blacklisted() acpi_disabled = 1;
+ *	acpi_irq_model=...
+ *	...
+ *
+ * return value: (currently ignored)
+ *	0: success
+ *	!0: failure
+ */
 
 int __init
 acpi_boot_init (void)
 {
 	int			result = 0;
 
+	if (acpi_disabled && !acpi_ht)
+		 return 1;
+
 	/*
 	 * The default interrupt routing model is PIC (8259).  This gets
 	 * overriden if IOAPICs are enumerated (below).
@@ -308,14 +331,14 @@ acpi_boot_init (void)
 	if (result)
 		return result;
 
+#ifdef	CONFIG_ACPI
 	result = acpi_blacklisted();
 	if (result) {
 		printk(KERN_WARNING PREFIX "BIOS listed in blacklist, disabling ACPI support\n");
 		acpi_disabled = 1;
 		return result;
 	}
-	else
-		printk(KERN_NOTICE PREFIX "BIOS not listed in blacklist\n");
+#endif
 
 #ifdef CONFIG_X86_LOCAL_APIC
 
@@ -366,27 +389,37 @@ acpi_boot_init (void)
 		return result;
 	}
 
-#ifndef CONFIG_ACPI_HT_ONLY
+#ifdef	CONFIG_ACPI
 	result = acpi_table_parse_madt(ACPI_MADT_LAPIC_NMI, acpi_parse_lapic_nmi);
 	if (result < 0) {
 		printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
 		/* TBD: Cleanup to allow fallback to MPS */
 		return result;
 	}
-#endif /*!CONFIG_ACPI_HT_ONLY*/
+#endif /*CONFIG_ACPI*/
 
 	acpi_lapic = 1;
 
 #endif /*CONFIG_X86_LOCAL_APIC*/
 
 #ifdef CONFIG_X86_IO_APIC
-#ifndef CONFIG_ACPI_HT_ONLY
+#ifdef	CONFIG_ACPI
 
 	/* 
 	 * I/O APIC 
 	 * --------
 	 */
 
+	/*
+	 * ACPI interpreter is required to complete interrupt setup,
+	 * so if it is off, don't enumerate the io-apics with ACPI.
+	 * If MPS is present, it will handle them,
+	 * otherwise the system will stay in PIC mode
+	 */
+	if (acpi_disabled) {
+		return 1;
+        }
+
 	result = acpi_table_parse_madt(ACPI_MADT_IOAPIC, acpi_parse_ioapic);
 	if (!result) { 
 		printk(KERN_ERR PREFIX "No IOAPIC entries present\n");
@@ -418,7 +451,7 @@ acpi_boot_init (void)
 
 	acpi_ioapic = 1;
 
-#endif /*!CONFIG_ACPI_HT_ONLY*/
+#endif /*CONFIG_ACPI*/
 #endif /*CONFIG_X86_IO_APIC*/
 
 #ifdef CONFIG_X86_LOCAL_APIC
diff --git a/arch/i386/kernel/cpu/intel.c b/arch/i386/kernel/cpu/intel.c
index 1736d1a2115b..0a2ca6584a2d 100644
--- a/arch/i386/kernel/cpu/intel.c
+++ b/arch/i386/kernel/cpu/intel.c
@@ -11,7 +11,6 @@
 
 #include "cpu.h"
 
-static int disable_P4_HT __initdata = 0;
 extern int trap_init_f00f_bug(void);
 
 #ifdef CONFIG_X86_INTEL_USERCOPY
@@ -68,13 +67,6 @@ int __init ppro_with_ram_bug(void)
 	return 0;
 }
 	
-static int __init P4_disable_ht(char *s)
-{
-	disable_P4_HT = 1;
-	return 1;
-}
-__setup("noht", P4_disable_ht);
-
 #define LVL_1_INST	1
 #define LVL_1_DATA	2
 #define LVL_2		3
@@ -281,7 +273,7 @@ static void __init init_intel(struct cpuinfo_x86 *c)
 		strcpy(c->x86_model_id, p);
 	
 #ifdef CONFIG_X86_HT
-	if (cpu_has(c, X86_FEATURE_HT) && !disable_P4_HT) {
+	if (cpu_has(c, X86_FEATURE_HT)) {
 		extern	int phys_proc_id[NR_CPUS];
 		
 		u32 	eax, ebx, ecx, edx;
@@ -329,8 +321,6 @@ static void __init init_intel(struct cpuinfo_x86 *c)
 	}
 too_many_siblings:
 
-	if (disable_P4_HT)
-		clear_bit(X86_FEATURE_HT, c->x86_capability);
 #endif
 
 	/* Work around errata */
diff --git a/arch/i386/kernel/dmi_scan.c b/arch/i386/kernel/dmi_scan.c
index fb3e7b80621d..37bada136270 100644
--- a/arch/i386/kernel/dmi_scan.c
+++ b/arch/i386/kernel/dmi_scan.c
@@ -129,10 +129,10 @@ static int __init dmi_iterate(void (*decode)(struct dmi_header *))
 			 * the SMBIOS version, which we don't know at this point.
 			 */
 			if(buf[14]!=0)
-				dmi_printk((KERN_INFO "DMI %d.%d present.\n",
-					buf[14]>>4, buf[14]&0x0F));
+				printk(KERN_INFO "DMI %d.%d present.\n",
+					buf[14]>>4, buf[14]&0x0F);
 			else
-				dmi_printk((KERN_INFO "DMI present.\n"));
+				printk(KERN_INFO "DMI present.\n");
 			dmi_printk((KERN_INFO "%d structures occupying %d bytes.\n",
 				num, len));
 			dmi_printk((KERN_INFO "DMI table at 0x%08X.\n",
@@ -162,6 +162,20 @@ enum
 
 static char *dmi_ident[DMI_STRING_MAX];
 
+/* print some information suitable for a blacklist entry. */
+void dmi_dump_system(void)
+{ 
+	printk("DMI: BIOS: %.40s, %.40s, %.40s\n",
+	       dmi_ident[DMI_BIOS_VENDOR], dmi_ident[DMI_BIOS_VERSION],
+	       dmi_ident[DMI_BIOS_DATE]);
+	printk("DMI: System: %.40s, %.40s, %.40s\n",
+	       dmi_ident[DMI_SYS_VENDOR], dmi_ident[DMI_PRODUCT_NAME],
+	       dmi_ident[DMI_PRODUCT_VERSION]); 
+	printk("DMI: Board: %.40s, %.40s, %.40s\n",
+	       dmi_ident[DMI_BOARD_VENDOR], dmi_ident[DMI_BOARD_NAME],
+	       dmi_ident[DMI_BOARD_VERSION]); 
+} 
+
 /*
  *	Save a DMI string
  */
@@ -341,6 +355,31 @@ static __init int fix_broken_hp_bios_irq9(struct dmi_blacklist *d)
 	return 0;
 }
 
+/* Some BIOS / motherboard combinations require the APIC to be enabled
+ * even on UP systems or will exhibit instability. */
+
+static int __init abit_apic_required(struct dmi_blacklist *d)
+{
+#ifdef CONFIG_X86_LOCAL_APIC
+#ifndef CONFIG_SMP
+	extern int enable_apic_up;
+	extern int dont_enable_local_apic;
+	extern int skip_ioapic_setup;
+
+	if (!enable_apic_up) {
+		printk(KERN_WARNING " *** %s: APIC forcibly enabled to avoid "
+				"RANDOM CRASHES.\n", d->ident);
+		printk(KERN_WARNING " *** PLEASE add 'apic' to the kernel "
+			"commandline AND enable it in the BIOS! ***\n");
+		dont_enable_local_apic=0;
+		enable_apic_up=1;
+		skip_ioapic_setup=0;
+	}
+#endif
+#endif
+	return 0;
+}
+
 /*
  *  Check for clue free BIOS implementations who use
  *  the following QA technique
@@ -416,6 +455,17 @@ static __init int broken_pirq(struct dmi_blacklist *d)
 }
 
 /*
+ * ASUS K7V-RM has broken ACPI table defining sleep modes
+ */
+
+static __init int broken_acpi_Sx(struct dmi_blacklist *d)
+{
+	printk(KERN_WARNING "Detected ASUS mainboard with broken ACPI sleep table\n");
+	dmi_broken |= BROKEN_ACPI_Sx;
+	return 0;
+}
+
+/*
  * Toshiba keyboard likes to repeat keys when they are not repeated.
  */
 
@@ -496,6 +546,63 @@ static __init int print_if_true(struct dmi_blacklist *d)
 	return 0;
 }
 
+
+extern int acpi_disabled, acpi_force;
+extern int enable_apic_up, skip_ioapic_setup; 
+
+static __init __attribute__((unused)) int acpi_disable(struct dmi_blacklist *d) 
+{ 
+	if (!acpi_force) { 
+		printk(KERN_NOTICE "%s detected: acpi off\n",d->ident); 
+		acpi_disabled = 1;
+	} else { 
+		printk(KERN_NOTICE 
+		       "Warning: DMI blacklist says broken, but acpi forced\n"); 
+	}
+	return 0;
+} 
+
+
+#ifdef	CONFIG_ACPI_BOOT
+extern int acpi_ht;
+
+/*
+ * Limit ACPI to CPU enumeration for HT
+ */
+static __init __attribute__((unused)) int force_acpi_ht(struct dmi_blacklist *d) 
+{ 
+	if (!acpi_force) { 
+		printk(KERN_NOTICE "%s detected: force use of acpi=ht\n", d->ident); 
+		acpi_disabled = 1; 
+		acpi_ht = 1; 
+	} else { 
+		printk(KERN_NOTICE 
+		       "Warning: acpi=force overrules DMI blacklist: acpi=ht\n"); 
+	}
+	return 0;
+} 
+#endif
+
+#ifdef	CONFIG_ACPI_PCI
+static __init int disable_acpi_pci(struct dmi_blacklist *d) 
+{ 
+	extern __init void pci_disable_acpi(void) ;
+
+	printk(KERN_NOTICE "%s detected: force use of pci=noacpi\n", d->ident); 	
+	pci_disable_acpi();
+	return 0;
+} 
+#endif
+
+#ifndef CONFIG_SMP
+static __init int force_apic(struct dmi_blacklist *d) 
+{ 
+	printk(KERN_NOTICE "%s detected: force APIC\n", d->ident); 	
+	enable_apic_up = 1; 
+	skip_ioapic_setup = 0;
+	return 0;
+} 
+#endif
 /*
  *	Process the DMI blacklists
  */
@@ -558,6 +665,11 @@ static __initdata struct dmi_blacklist dmi_blacklist[]={
 			MATCH(DMI_PRODUCT_NAME, "L8400K series Notebook PC"),
 			NO_MATCH, NO_MATCH
 			} },					
+	{ apm_is_horked, "ABIT KX7-333[R]", { /* APM blows on shutdown */
+			MATCH(DMI_BOARD_VENDOR, "ABIT"),
+			MATCH(DMI_BOARD_NAME, "VT8367-8233A (KX7-333[R])"),
+			NO_MATCH, NO_MATCH,
+			} },
 	{ apm_is_horked, "Trigem Delhi3", { /* APM crashes */
 			MATCH(DMI_SYS_VENDOR, "TriGem Computer, Inc"),
 			MATCH(DMI_PRODUCT_NAME, "Delhi3"),
@@ -706,6 +818,12 @@ static __initdata struct dmi_blacklist dmi_blacklist[]={
 			NO_MATCH, NO_MATCH
 			} },
 
+	{ abit_apic_required, "ABIT KX7-333[R]", { /* Will crash randomly w/o */
+			MATCH(DMI_BOARD_VENDOR, "ABIT"),
+			MATCH(DMI_BOARD_NAME, "VT8367-8233A (KX7-333[R])"),
+			NO_MATCH, NO_MATCH,
+			} },
+
 	/* Problem Intel 440GX bioses */
 
 	{ broken_pirq, "SABR1 Bios", {			/* Bad $PIR */
@@ -741,6 +859,12 @@ static __initdata struct dmi_blacklist dmi_blacklist[]={
 			NO_MATCH, NO_MATCH, NO_MATCH
 			} },
 			
+	{ broken_acpi_Sx, "ASUS K7V-RM", {		/* Bad ACPI Sx table */
+			MATCH(DMI_BIOS_VERSION,"ASUS K7V-RM ACPI BIOS Revision 1003A"),
+			MATCH(DMI_BOARD_NAME, "<K7V-RM>"),
+			NO_MATCH, NO_MATCH
+			} },
+
 	{ broken_toshiba_keyboard, "Toshiba Satellite 4030cdt", { /* Keyboard generates spurious repeats */
 			MATCH(DMI_PRODUCT_NAME, "S4030CDT/4.3"),
 			NO_MATCH, NO_MATCH, NO_MATCH
@@ -799,6 +923,122 @@ static __initdata struct dmi_blacklist dmi_blacklist[]={
 			NO_MATCH, NO_MATCH,
 			} },
 
+	/*
+	 *	Boxes that need ACPI disabled
+	 */
+
+	{ acpi_disable, "IBM Thinkpad", {
+			MATCH(DMI_BOARD_VENDOR, "IBM"),
+			MATCH(DMI_BOARD_NAME, "2629H1G"),
+			NO_MATCH, NO_MATCH }},
+
+#ifdef	CONFIG_ACPI_BOOT
+	/*
+	 *	Boxes that need acpi=ht 
+	 */
+
+	{ force_acpi_ht, "FSC Primergy T850", {
+			MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
+			MATCH(DMI_PRODUCT_NAME, "PRIMERGY T850"),
+			NO_MATCH, NO_MATCH }},
+
+	{ force_acpi_ht, "DELL GX240", {
+			MATCH(DMI_BOARD_VENDOR, "Dell Computer Corporation"),
+			MATCH(DMI_BOARD_NAME, "OptiPlex GX240"),
+			NO_MATCH, NO_MATCH }},
+
+	{ force_acpi_ht, "HP VISUALIZE NT Workstation", {
+			MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
+			MATCH(DMI_PRODUCT_NAME, "HP VISUALIZE NT Workstation"),
+			NO_MATCH, NO_MATCH }},
+
+	{ force_acpi_ht, "Compaq ProLiant DL380 G2", {
+			MATCH(DMI_SYS_VENDOR, "Compaq"),
+			MATCH(DMI_PRODUCT_NAME, "ProLiant DL380 G2"),
+			NO_MATCH, NO_MATCH }},
+
+	{ force_acpi_ht, "Compaq ProLiant ML530 G2", {
+			MATCH(DMI_SYS_VENDOR, "Compaq"),
+			MATCH(DMI_PRODUCT_NAME, "ProLiant ML530 G2"),
+			NO_MATCH, NO_MATCH }},
+
+	{ force_acpi_ht, "Compaq ProLiant ML350 G3", {
+			MATCH(DMI_SYS_VENDOR, "Compaq"),
+			MATCH(DMI_PRODUCT_NAME, "ProLiant ML350 G3"),
+			NO_MATCH, NO_MATCH }},
+
+	{ force_acpi_ht, "Compaq Workstation W8000", {
+			MATCH(DMI_SYS_VENDOR, "Compaq"),
+			MATCH(DMI_PRODUCT_NAME, "Workstation W8000"),
+			NO_MATCH, NO_MATCH }},
+
+	{ force_acpi_ht, "ASUS P4B266", {
+			MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
+			MATCH(DMI_BOARD_NAME, "P4B266"),
+			NO_MATCH, NO_MATCH }},
+
+	{ force_acpi_ht, "ASUS P2B-DS", {
+			MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
+			MATCH(DMI_BOARD_NAME, "P2B-DS"),
+			NO_MATCH, NO_MATCH }},
+
+	{ force_acpi_ht, "ASUS CUR-DLS", {
+			MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
+			MATCH(DMI_BOARD_NAME, "CUR-DLS"),
+			NO_MATCH, NO_MATCH }},
+
+	{ force_acpi_ht, "ASUS A7V", {
+			MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC"),
+			MATCH(DMI_BOARD_NAME, "<A7V>"),
+			MATCH(DMI_BIOS_VERSION, "ASUS A7V ACPI BIOS Revision 1011"), NO_MATCH }},
+
+	{ force_acpi_ht, "ABIT i440BX-W83977", {
+			MATCH(DMI_BOARD_VENDOR, "ABIT <http://www.abit.com>"),
+			MATCH(DMI_BOARD_NAME, "i440BX-W83977 (BP6)"),
+			NO_MATCH, NO_MATCH }},
+
+	{ force_acpi_ht, "IBM Bladecenter", {
+			MATCH(DMI_BOARD_VENDOR, "IBM"),
+			MATCH(DMI_BOARD_NAME, "IBM eServer BladeCenter HS20"),
+			NO_MATCH, NO_MATCH }},
+
+	{ force_acpi_ht, "IBM eServer xSeries 360", {
+			MATCH(DMI_BOARD_VENDOR, "IBM"),
+			MATCH(DMI_BOARD_NAME, "eServer xSeries 360"),
+			NO_MATCH, NO_MATCH }},
+
+	{ force_acpi_ht, "IBM eserver xSeries 330", {
+			MATCH(DMI_BOARD_VENDOR, "IBM"),
+			MATCH(DMI_BOARD_NAME, "eserver xSeries 330"),
+			NO_MATCH, NO_MATCH }},
+
+	{ force_acpi_ht, "IBM eserver xSeries 440", {
+			MATCH(DMI_BOARD_VENDOR, "IBM"),
+			MATCH(DMI_PRODUCT_NAME, "eserver xSeries 440"),
+			NO_MATCH, NO_MATCH }},
+#endif	// CONFIG_ACPI_BOOT
+
+#ifdef	CONFIG_ACPI_PCI
+	/*
+	 *	Boxes that need ACPI PCI IRQ routing disabled
+	 */
+
+	{ disable_acpi_pci, "ASUS A7V", {
+			MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC"),
+			MATCH(DMI_BOARD_NAME, "<A7V>"),
+			MATCH(DMI_BIOS_VERSION, "ASUS A7V ACPI BIOS Revision 1007"), NO_MATCH }},
+#endif
+
+#ifndef CONFIG_SMP
+	/* 
+  	 * Enable APIC on UP kernels.
+	 */
+
+	{ force_apic, "Supermicro P4DC6", { 
+		MATCH(DMI_BOARD_VENDOR, "Supermicro"),
+		MATCH(DMI_BOARD_NAME, "P4DC6"), 
+		NO_MATCH, NO_MATCH } },
+#endif
 	{ NULL, }
 };
 	
@@ -808,11 +1048,31 @@ static __initdata struct dmi_blacklist dmi_blacklist[]={
  *	returns 1 or we hit the end.
  */
  
+#define	ACPI_BLACKLIST_CUTOFF_YEAR	2001
+
 static __init void dmi_check_blacklist(void)
 {
 	struct dmi_blacklist *d;
 	int i;
 		
+	if (dmi_ident[DMI_BIOS_DATE]) { 
+		char *s = strrchr(dmi_ident[DMI_BIOS_DATE], '/'); 
+		if (s) { 
+			int year, disable = 0;
+			s++; 
+			year = simple_strtoul(s,NULL,0); 
+			if (year >= 1000) 
+				disable = year < ACPI_BLACKLIST_CUTOFF_YEAR; 
+			else if (year < 1 || (year > 90 && year <= 99))
+				disable = 1; 
+			if (disable && !acpi_force) { 
+				printk(KERN_NOTICE "ACPI disabled because your bios is from %s and too old\n", s);
+				printk(KERN_NOTICE "You can enable it with acpi=force\n");
+				acpi_disabled = 1; 
+			} 
+		}
+	}
+
 	d=&dmi_blacklist[0];
 	while(d->callback)
 	{
@@ -892,6 +1152,8 @@ void __init dmi_scan_machine(void)
 	int err = dmi_iterate(dmi_decode);
 	if(err == 0)
 		dmi_check_blacklist();
+	else
+		printk(KERN_INFO "DMI not present.\n");
 }
 
 EXPORT_SYMBOL(is_unsafe_smbus);
diff --git a/arch/i386/kernel/mpparse.c b/arch/i386/kernel/mpparse.c
index 131cf540b4b8..79666579a424 100644
--- a/arch/i386/kernel/mpparse.c
+++ b/arch/i386/kernel/mpparse.c
@@ -620,7 +620,7 @@ void __init get_smp_config (void)
 
 	/*
 	 * ACPI may be used to obtain the entire SMP configuration or just to 
-	 * enumerate/configure processors (CONFIG_ACPI_HT_ONLY).  Note that 
+	 * enumerate/configure processors (CONFIG_ACPI_HT).  Note that 
 	 * ACPI supports both logical (e.g. Hyper-Threading) and physical 
 	 * processors, where MPS only supports physical.
 	 */
@@ -1011,8 +1011,9 @@ void __init mp_config_acpi_legacy_irqs (void)
 			panic("Max # of irq sources exceeded!\n");
 	}
 }
+#endif	/* CONFIG_X86_IO_APIC */
 
-#ifndef CONFIG_ACPI_HT_ONLY
+#ifdef	CONFIG_ACPI
 
 /* Ensure the ACPI SCI interrupt level is active low, edge-triggered */
 
@@ -1067,8 +1068,7 @@ void __init mp_config_ioapic_for_sci(int irq)
 
 	io_apic_set_pci_routing(ioapic, ioapic_pin, irq, 1, 1); // Active low, level triggered
 }
-
-#endif /*CONFIG_ACPI_HT_ONLY*/
+#endif	/* CONFIG_ACPI */
 
 #ifdef CONFIG_ACPI_PCI
 
@@ -1149,6 +1149,4 @@ void __init mp_parse_prt (void)
 
 #endif /*CONFIG_ACPI_PCI*/
 
-#endif /*CONFIG_X86_IO_APIC*/
-
 #endif /*CONFIG_ACPI_BOOT*/
diff --git a/arch/i386/kernel/setup.c b/arch/i386/kernel/setup.c
index 01a3990182c5..436d1366b255 100644
--- a/arch/i386/kernel/setup.c
+++ b/arch/i386/kernel/setup.c
@@ -62,13 +62,20 @@ 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 = 1;
+#ifdef	CONFIG_ACPI
+	int acpi_disabled __initdata = 0;
 #else
-int acpi_disabled = 0;
+	int acpi_disabled __initdata = 1;
 #endif
 EXPORT_SYMBOL(acpi_disabled);
 
+#ifdef	CONFIG_ACPI_BOOT
+	int acpi_ht __initdata = 1;	/* enable HT */
+#endif
+
+int acpi_force __initdata = 0;
+
+
 int MCA_bus;
 /* for MCA, but anyone else can use it if they want */
 unsigned int machine_id;
@@ -516,13 +523,26 @@ static void __init parse_cmdline_early (char ** cmdline_p)
 			}
 		}
 
-		/* "acpi=off" disables both ACPI table parsing and interpreter init */
-		if (c == ' ' && !memcmp(from, "acpi=off", 8))
+#ifdef CONFIG_ACPI_BOOT
+		/* "acpi=off" disables both ACPI table parsing and interpreter */
+		else if (!memcmp(from, "acpi=off", 8)) {
+			acpi_ht = 0;
 			acpi_disabled = 1;
+		}
 
-		/* "acpismp=force" turns on ACPI again */
-		if (c == ' ' && !memcmp(from, "acpismp=force", 13))
+		/* acpi=force to over-ride black-list */
+		else if (!memcmp(from, "acpi=force", 10)) {
+			acpi_force = 1;
+			acpi_ht=1;
 			acpi_disabled = 0;
+		}
+
+		/* Limit ACPI just to boot-time to enable HT */
+		else if (!memcmp(from, "acpi=ht", 7)) {
+			acpi_ht = 1;
+			if (!acpi_force) acpi_disabled = 1;
+		}
+#endif
 
 		/*
 		 * highmem=size forces highmem to be exactly 'size' bytes.
@@ -982,8 +1002,7 @@ void __init setup_arch(char **cmdline_p)
 	/*
 	 * Parse the ACPI tables for possible boot-time SMP configuration.
 	 */
-	if (!acpi_disabled)
-		acpi_boot_init();
+	(void) acpi_boot_init();
 #endif
 #ifdef CONFIG_X86_LOCAL_APIC
 	if (smp_found_config)
diff --git a/arch/i386/kernel/smpboot.c b/arch/i386/kernel/smpboot.c
index 00c783cbd750..566ab287c7f8 100644
--- a/arch/i386/kernel/smpboot.c
+++ b/arch/i386/kernel/smpboot.c
@@ -954,7 +954,7 @@ static void __init smp_boot_cpus(unsigned int max_cpus)
 	 * If we couldn't find an SMP configuration at boot time,
 	 * get out of here now!
 	 */
-	if (!smp_found_config) {
+	if (!smp_found_config && !acpi_lapic) {
 		printk(KERN_NOTICE "SMP motherboard not detected.\n");
 		smpboot_clear_io_apic_irqs();
 		phys_cpu_present_map = 1;
diff --git a/drivers/Makefile b/drivers/Makefile
index 737fa9fc26f6..ba1821c3c12a 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -7,7 +7,7 @@
 
 obj-$(CONFIG_PCI)		+= pci/
 obj-$(CONFIG_PARISC)		+= parisc/
-obj-$(CONFIG_ACPI)		+= acpi/
+obj-$(CONFIG_ACPI_BOOT)		+= acpi/
 # 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/acpi/Kconfig b/drivers/acpi/Kconfig
index 769dd4e80cf8..e09a935b4a97 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -2,12 +2,36 @@
 # ACPI Configuration
 #
 
-menu "ACPI Support"
+menu "ACPI (Advanced Configuration and Power Interface) Support"
+
+config ACPI_HT
+	bool "ACPI Processor Enumeration for HT"
+	depends on (X86 && X86_LOCAL_APIC)
+	default y
+	---help---
+	  ACPI enumerates both logical (a.k.a. Hyper-Threaded -- HT)
+	  and physical processors.  It is designed to obsolete several older
+	  specifications, including the MultiProcessor Specification (MPS),
+	  which supported only physical processors.
+
+	  CONFIG_ACPI_HT includes the minimal ACPI boot-time code
+	  necessary to enumerate logical processors and enable HT.
+
+	  CONFIG_ACPI includes CONFIG_ACPI_HT, plus IO APIC enumeration,
+	  and the hooks to run the ACPI AML interpreter for run-time events.
+
+	  When CONFIG_ACPI is selected, the command-line option "acpi=ht"
+	  is available to run just the ACPI boot-time code -- just as if
+	  only CONFIG_ACPI_HT were selected.
+
+	  Note that "acpi=off" can be used to disable all ACPI code in the kernel.
 
 config ACPI
-	bool "ACPI Support" if X86
+	bool "Full ACPI Support"
 	depends on !X86_VISWS
-	default y if IA64 && (!IA64_HP_SIM || IA64_SGI_SN)
+	depends on !IA64_HP_SIM
+	depends on IA64 || (X86 && ACPI_HT)
+	default y
 	---help---
 	  Advanced Configuration and Power Interface (ACPI) support for 
 	  Linux requires an ACPI compliant platform (hardware/firmware),
@@ -36,30 +60,16 @@ config ACPI
 	  available at:
 	  <http://www.acpi.info>
 
-config ACPI_HT_ONLY
-	bool "CPU Enumeration Only"
-	depends on X86 && ACPI && X86_LOCAL_APIC
-	---help---
-	  This option enables limited ACPI support -- just enough to 
-	  enumerate processors from the ACPI Multiple APIC Description 
-	  Table (MADT).  Note that ACPI supports both logical (e.g. Hyper-
-	  Threading) and physical processors, where the MultiProcessor 
-	  Specification (MPS) table only supports physical processors.
-
-	  Full ACPI support (CONFIG_ACPI) is preferred.  Use this option 
-	  only if you wish to limit ACPI's role to processor enumeration.
-
-	  In this configuration, ACPI defaults to off. It must be enabled
-	  on the command-line with the "acpismp=force" option.
-
 config ACPI_BOOT
 	bool
-	depends on IA64 && (!IA64_HP_SIM || IA64_SGI_SN) || X86 && ACPI && !ACPI_HT_ONLY
+	depends on ACPI || ACPI_HT
 	default y
 
 config ACPI_SLEEP
 	bool "Sleep States"
-	depends on X86 && ACPI && !ACPI_HT_ONLY && SOFTWARE_SUSPEND
+	depends on X86 && ACPI
+	depends on SOFTWARE_SUSPEND
+	default y
 	---help---
 	  This option adds support for ACPI suspend states. 
 
@@ -83,7 +93,8 @@ config ACPI_SLEEP_PROC_FS
 
 config ACPI_AC
 	tristate "AC Adapter"
-	depends on X86 && ACPI && !ACPI_HT_ONLY
+	depends on X86 && ACPI
+	default m
 	help
 	  This driver adds support for the AC Adapter object, which indicates
 	  whether a system is on AC, or not.  Typically, only mobile systems 
@@ -91,7 +102,8 @@ config ACPI_AC
 
 config ACPI_BATTERY
 	tristate "Battery"
-	depends on X86 && ACPI && !ACPI_HT_ONLY
+	depends on X86 && ACPI
+	default m
 	help
 	  This driver adds support for battery information through
 	  /proc/acpi/battery. If you have a mobile system with a battery, 
@@ -99,7 +111,9 @@ config ACPI_BATTERY
 
 config ACPI_BUTTON
 	tristate "Button"
-	depends on IA64 && !IA64_HP_SIM || X86 && ACPI && !ACPI_HT_ONLY
+	depends on ACPI
+	depends on !IA64_SGI_SN
+	default m
 	help
 	  This driver registers for events based on buttons, such as the
 	  power, sleep, and lid switch.  In the future, a daemon will read
@@ -109,14 +123,18 @@ config ACPI_BUTTON
 
 config ACPI_FAN
 	tristate "Fan"
-	depends on IA64 && !IA64_HP_SIM || X86 && ACPI && !ACPI_HT_ONLY
+	depends on ACPI
+	depends on !IA64_SGI_SN
+	default m
 	help
 	  This driver adds support for ACPI fan devices, allowing user-mode 
 	  applications to perform basic fan control (on, off, status).
 
 config ACPI_PROCESSOR
 	tristate "Processor"
-	depends on IA64 && !IA64_HP_SIM || X86 && ACPI && !ACPI_HT_ONLY
+	depends on ACPI
+	depends on !IA64_SGI_SN
+	default m
 	help
 	  This driver installs ACPI as the idle handler for Linux, and uses
 	  ACPI C2 and C3 processor states to save power, on systems that
@@ -125,6 +143,7 @@ config ACPI_PROCESSOR
 config ACPI_THERMAL
 	tristate "Thermal Zone"
 	depends on ACPI_PROCESSOR
+	default m
 	help
 	  This driver adds support for ACPI thermal zones.  Most mobile and
 	  some desktop systems support ACPI thermal zones.  It is HIGHLY
@@ -132,12 +151,16 @@ config ACPI_THERMAL
 	  may be damaged without it.
 
 config ACPI_NUMA
-	bool "NUMA support" if NUMA && (IA64 && !IA64_HP_SIM || X86 && ACPI && !ACPI_HT_ONLY && !X86_64)
+	bool "NUMA support"
+	depends on ACPI
+	depends on NUMA
+	depends on !X86_64
 	default y if IA64_GENERIC || IA64_SGI_SN2
 
 config ACPI_ASUS
         tristate "ASUS/Medion Laptop Extras"
-        depends on X86 && ACPI && !ACPI_HT_ONLY
+        depends on X86 && ACPI
+	default m
         ---help---
           This driver provides support for extra features of ACPI-compatible
           ASUS laptops. As some of Medion laptops are made by ASUS, it may also
@@ -162,7 +185,8 @@ config ACPI_ASUS
           
 config ACPI_TOSHIBA
 	tristate "Toshiba Laptop Extras"
-	depends on X86 && ACPI && !ACPI_HT_ONLY
+	depends on X86 && ACPI
+	default m
 	---help---
 	  This driver adds support for access to certain system settings
 	  on "legacy free" Toshiba laptops.  These laptops can be recognized by
@@ -188,7 +212,9 @@ config ACPI_TOSHIBA
 
 config ACPI_DEBUG
 	bool "Debug Statements"
-	depends on IA64 && !IA64_HP_SIM || X86 && ACPI && !ACPI_HT_ONLY
+	depends on ACPI
+	depends on !IA64_SGI_SN
+	default n
 	help
 	  The ACPI driver can optionally report errors with a great deal
 	  of verbosity. Saying Y enables these statements. This will increase
@@ -196,17 +222,19 @@ config ACPI_DEBUG
 
 config ACPI_BUS
 	bool
-	depends on IA64 && !IA64_HP_SIM || X86 && ACPI && !ACPI_HT_ONLY
+	depends on ACPI
+	depends on !IA64_SGI_SN
 	default y
 
 config ACPI_INTERPRETER
 	bool
-	depends on IA64 && !IA64_HP_SIM || X86 && ACPI && !ACPI_HT_ONLY
+	depends on ACPI
+	depends on !IA64_SGI_SN
 	default y
 
 config ACPI_EC
 	bool
-	depends on X86 && ACPI && !ACPI_HT_ONLY
+	depends on X86 && ACPI
 	default y
 	help
 	  This driver is required on some systems for the proper operation of
@@ -215,17 +243,20 @@ config ACPI_EC
 
 config ACPI_POWER
 	bool
-	depends on IA64 && !IA64_HP_SIM || X86 && ACPI && !ACPI_HT_ONLY
+	depends on ACPI
+	depends on !IA64_SGI_SN
 	default y
 
 config ACPI_PCI
 	bool
-	depends on IA64 && !IA64_HP_SIM || X86 && ACPI && !ACPI_HT_ONLY
+	depends on ACPI
+	depends on !IA64_SGI_SN
 	default PCI
 
 config ACPI_SYSTEM
 	bool
-	depends on IA64 && !IA64_HP_SIM || X86 && ACPI && !ACPI_HT_ONLY
+	depends on ACPI
+	depends on !IA64_SGI_SN
 	default y
 	help
 	  This driver will enable your system to shut down using ACPI, and
@@ -233,7 +264,8 @@ config ACPI_SYSTEM
 
 config ACPI_EFI
 	bool
-	depends on IA64 && (!IA64_HP_SIM || IA64_SGI_SN)
+	depends on ACPI
+	depends on IA64
 	default y
 
 endmenu
diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
index f5f7c06e2a51..d16d4b876ad6 100644
--- a/drivers/acpi/Makefile
+++ b/drivers/acpi/Makefile
@@ -12,12 +12,13 @@ endif
 
 EXTRA_CFLAGS	+= $(ACPI_CFLAGS)
 
-obj-y		:= acpi_ksyms.o 
+obj-$(CONFIG_ACPI)		:= acpi_ksyms.o 
 
 #
 # ACPI Boot-Time Table Parsing
 #
-obj-$(CONFIG_ACPI_BOOT)		+= tables.o blacklist.o
+obj-$(CONFIG_ACPI_BOOT)		+= tables.o
+obj-$(CONFIG_ACPI)		+= blacklist.o
 
 #
 # ACPI Core Subsystem (Interpreter)
diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index fd9b9419d9d6..09087bd4a00d 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -691,7 +691,7 @@ static int __init acpi_init (void)
 	acpi_set_debug(ACPI_DEBUG_LOW);
 
 	if (acpi_disabled) {
-		printk(KERN_INFO PREFIX "Disabled via command line (acpi=off)\n");
+		printk(KERN_INFO PREFIX "Interpreter disabled.\n");
 		return -ENODEV;
 	}
 
diff --git a/drivers/acpi/tables.c b/drivers/acpi/tables.c
index 233f8e3579df..efd62993e875 100644
--- a/drivers/acpi/tables.c
+++ b/drivers/acpi/tables.c
@@ -96,10 +96,11 @@ acpi_table_print (
 	else
 		name = header->signature;
 
-	printk(KERN_INFO PREFIX "%.4s (v%3.3d %6.6s %8.8s %5.5d.%5.5d) @ 0x%p\n",
+	printk(KERN_INFO PREFIX "%.4s (v%3.3d %6.6s %8.8s 0x%08x %.4s 0x%08x) @ 0x%p\n",
 		name, header->revision, header->oem_id,
-		header->oem_table_id, header->oem_revision >> 16,
-		header->oem_revision & 0xffff, (void *) phys_addr);
+		header->oem_table_id, header->oem_revision,
+		header->asl_compiler_id, header->asl_compiler_revision,
+		(void *) phys_addr);
 }
 
 
@@ -219,12 +220,16 @@ acpi_table_compute_checksum (
 	return (sum & 0xFF);
 }
 
+/*
+ * acpi_get_table_header_early()
+ * for acpi_blacklisted(), acpi_table_get_sdt()
+ */
 int __init
 acpi_get_table_header_early (
 	enum acpi_table_id	id,
 	struct acpi_table_header **header)
 {
-	int i;
+	unsigned int i;
 	enum acpi_table_id temp_id;
 
 	/* DSDT is different from the rest */
@@ -281,7 +286,7 @@ acpi_table_parse_madt_family (
 	acpi_table_entry_header	*entry = NULL;
 	unsigned long		count = 0;
 	unsigned long		madt_end = 0;
-	int			i = 0;
+	unsigned int			i = 0;
 
 	if (!handler)
 		return -EINVAL;
@@ -343,7 +348,7 @@ acpi_table_parse (
 	acpi_table_handler	handler)
 {
 	int			count = 0;
-	int			i = 0;
+	unsigned int		i = 0;
 
 	if (!handler)
 		return -EINVAL;
@@ -364,7 +369,7 @@ acpi_table_get_sdt (
 	struct acpi_table_rsdp	*rsdp)
 {
 	struct acpi_table_header *header = NULL;
-	int			i, id = 0;
+	unsigned int		i, id = 0;
 
 	if (!rsdp)
 		return -EINVAL;
@@ -550,7 +555,7 @@ acpi_table_init (void)
 		return -ENODEV;
 	}
 
-	printk(KERN_INFO PREFIX "RSDP (v%3.3d %6.6s                     ) @ 0x%p\n",
+	printk(KERN_INFO PREFIX "RSDP (v%3.3d %6.6s                                    ) @ 0x%p\n",
 		rsdp->revision, rsdp->oem_id, (void *) rsdp_phys);
 
 	if (rsdp->revision < 2)
diff --git a/include/asm-i386/acpi.h b/include/asm-i386/acpi.h
index 0f158dc1615e..350048b1f39e 100644
--- a/include/asm-i386/acpi.h
+++ b/include/asm-i386/acpi.h
@@ -106,30 +106,22 @@
         :"0"(n_hi), "1"(n_lo))
 
 
-#ifdef CONFIG_ACPI_HT_ONLY
-extern int acpi_lapic;
-#define acpi_ioapic 0
+#if defined(CONFIG_ACPI_BOOT) && defined(CONFIG_X86_LOCAL_APIC)
+	extern int acpi_lapic;
 #else
-#ifndef CONFIG_ACPI_BOOT
-#define acpi_lapic 0
-#define acpi_ioapic 0
-#else
-#ifdef CONFIG_X86_LOCAL_APIC
-extern int acpi_lapic;
-#else
-#define acpi_lapic 0
+	#define acpi_lapic 0
 #endif
-#ifdef CONFIG_X86_IO_APIC
-extern int acpi_ioapic;
+
+#if defined(CONFIG_ACPI_BOOT) && defined(CONFIG_X86_IO_APIC)
+	extern int acpi_ioapic;
 #else
-#define acpi_ioapic 0
-#endif
+	#define acpi_ioapic 0
 #endif
 
+#ifdef CONFIG_ACPI_BOOT
 /* Fixmap pages to reserve for ACPI boot-time tables (see fixmap.h) */
 #define FIX_ACPI_PAGES 4
-
-#endif /*CONFIG_ACPI_BOOT*/
+#endif
 
 #ifdef CONFIG_ACPI_SLEEP
 
diff --git a/init/do_mounts.c b/init/do_mounts.c
index 0869bc8e6a2f..4486e056d57f 100644
--- a/init/do_mounts.c
+++ b/init/do_mounts.c
@@ -268,6 +268,16 @@ retry:
 		printk("VFS: Cannot open root device \"%s\" or %s\n",
 				root_device_name, b);
 		printk("Please append a correct \"root=\" boot option\n");
+#ifdef __i386__
+ 		{
+ 			extern void dmi_dump_system(void);
+ 			printk ("You may want to retry boot with pci=noacpi, "
+ 				"acpi=ht, or acpi=off on the command line.\n");
+ 			printk ("If one of them helps please report it with "
+ 				"the following lines:\n");
+ 			dmi_dump_system();
+ 		}
+#endif
 		panic("VFS: Unable to mount root fs on %s", b);
 	}
 	panic("VFS: Unable to mount root fs on %s", __bdevname(ROOT_DEV, b));