* Initial support for ACPI tables to detect multiprocessor configurations

* ACPI is evaluated first as it also handles things like multi core or hyper threading setups
* Removed other (disabled) hyper threading code per the notes in the corresponding ToDo
* Limit the detected CPU count to 2 for now as I wasn't able to get it working in either emulation nor real hardware with more than 2 CPUs
* Added a reserved byte to the mp_config_table struct, it worked only by luck as the compiler did padding there to get to the same size

I can now boot my Core 2 Quad with two out of four processors active :-)

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23100 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/kernel/arch/x86/smp_acpi.h

@@ -0,0 +1,69 @@
+/*
+ * Copyright 2007, Michael Lotz, [email protected]. All rights reserved.
+ * Distributed under the terms of the MIT License.
+ */
+#ifndef _KERNEL_ARCH_x86_SMP_ACPI_H
+#define _KERNEL_ARCH_x86_SMP_ACPI_H
+
+#define ACPI_RSDP_SIGNATURE		"RSD PTR "
+#define ACPI_RSDT_SIGNATURE		"RSDT"
+#define ACPI_MADT_SIGNATURE		"APIC"
+
+struct acpi_rsdp {
+	char	signature[8];			/* "RSD PTR " including blank */
+	uint8	checksum;				/* checksum of bytes 0-19 (per ACPI 1.0) */
+	char	oem_id[6];				/* not null terminated */
+	uint8	revision;				/* 0 = ACPI 1.0, 2 = ACPI 3.0 */
+	uint32	rsdt_address;			/* physical memory address of RSDT */
+	uint32	rsdt_length;			/* length in bytes including header */
+	uint64	xsdt_address;			/* 64bit physical memory address of XSDT */
+	uint8	extended_checksum;		/* including entire table */
+	uint8	reserved[3];
+} _PACKED;
+
+struct acpi_descriptor_header {
+	char	signature[4];			/* table identifier as ASCII string */
+	uint32	length;					/* length in bytes of the entire table */
+	uint8	revision;
+	uint8	checksum;				/* checksum of entire table */
+	char	oem_id[6];				/* not null terminated */
+	char	oem_table_id[8];		/* oem supplied table identifier */
+	uint32	oem_revision;			/* oem supplied revision number */
+	char	creator_id[4];			/* creator / asl compiler id */
+	uint32	creator_revision;		/* compiler revision */
+} _PACKED;
+
+struct acpi_madt {
+	acpi_descriptor_header	header;	/* "APIC" signature */
+	uint32	local_apic_address;		/* physical address for local CPUs APICs */
+	uint32	flags;
+} _PACKED;
+
+enum {
+	ACPI_MADT_LOCAL_APIC = 0,
+	ACPI_MADT_IO_APIC = 1
+};
+
+struct acpi_apic {
+	uint8	type;
+	uint8	length;
+} _PACKED;
+
+struct acpi_local_apic {
+	uint8	type;					/* 0 = processor local APIC */
+	uint8	length;					/* 8 bytes */
+	uint8	acpi_processor_id;
+	uint8	apic_id;				/* the id of this APIC */
+	uint32	flags;					/* 1 = enabled */
+} _PACKED;
+
+struct acpi_io_apic {
+	uint8	type;					/* 1 = I/O APIC */
+	uint8	length;					/* 12 bytes */
+	uint8	io_apic_id;				/* the id of this APIC */
+	uint8	reserved;
+	uint32	io_apic_address;		/* phyisical address of I/O APIC */
+	uint32	interrupt_base;			/* global system interrupt base */
+} _PACKED;
+
+#endif	/* _KERNEL_ARCH_x86_SMP_ACPI_H */

headers/private/kernel/arch/x86/smp_apic.h

@@ -125,6 +125,7 @@ struct mp_config_table {
 	uint32	apic;				/* address of apic */
 	uint16	ext_length;			/* length of extended section */
 	uint8	ext_checksum;		/* checksum of extended table entries */
+	uint8	reserved;
 };
 
 struct mp_floating_struct {