/* * Copyright (C) 2005 Intel Corporation * Copyright (C) 2009 Hewlett-Packard Development Company, L.P. * *	Alex Chiang <achiang@hp.com> *	- Unified x86/ia64 implementations */#include <linux/export.h>#include <linux/acpi.h>#include <acpi/processor.h> #define _COMPONENT		ACPI_PROCESSOR_COMPONENTACPI_MODULE_NAME("processor_core"); static int map_lapic_id(struct acpi_subtable_header *entry,		 u32 acpi_id, int *apic_id){	struct acpi_madt_local_apic *lapic =		(struct acpi_madt_local_apic *)entry; 	if (!(lapic->lapic_flags & ACPI_MADT_ENABLED))		return -ENODEV; 	if (lapic->processor_id != acpi_id)		return -EINVAL; 	*apic_id = lapic->id;	return 0;} static int map_x2apic_id(struct acpi_subtable_header *entry,			 int device_declaration, u32 acpi_id, int *apic_id){	struct acpi_madt_local_x2apic *apic =		(struct acpi_madt_local_x2apic *)entry; 	if (!(apic->lapic_flags & ACPI_MADT_ENABLED))		return -ENODEV; 	if (device_declaration && (apic->uid == acpi_id)) {		*apic_id = apic->local_apic_id;		return 0;	} 	return -EINVAL;} static int map_lsapic_id(struct acpi_subtable_header *entry,		int device_declaration, u32 acpi_id, int *apic_id){	struct acpi_madt_local_sapic *lsapic =		(struct acpi_madt_local_sapic *)entry; 	if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))		return -ENODEV; 	if (device_declaration) {		if ((entry->length < 16) || (lsapic->uid != acpi_id))			return -EINVAL;	} else if (lsapic->processor_id != acpi_id)		return -EINVAL; 	*apic_id = (lsapic->id << 8) | lsapic->eid;	return 0;} static int map_madt_entry(int type, u32 acpi_id){	unsigned long madt_end, entry;	static struct acpi_table_madt *madt;	static int read_madt;	int apic_id = -1; 	if (!read_madt) {		if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,					(struct acpi_table_header **)&madt)))			madt = NULL;		read_madt++;	} 	if (!madt)		return apic_id; 	entry = (unsigned long)madt;	madt_end = entry + madt->header.length; 	/* Parse all entries looking for a match. */ 	entry += sizeof(struct acpi_table_madt);	while (entry + sizeof(struct acpi_subtable_header) < madt_end) {		struct acpi_subtable_header *header =			(struct acpi_subtable_header *)entry;		if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {			if (!map_lapic_id(header, acpi_id, &apic_id))				break;		} else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {			if (!map_x2apic_id(header, type, acpi_id, &apic_id))				break;		} else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {			if (!map_lsapic_id(header, type, acpi_id, &apic_id))				break;		}		entry += header->length;	}	return apic_id;} static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id){	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };	union acpi_object *obj;	struct acpi_subtable_header *header;	int apic_id = -1; 	if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))		goto exit; 	if (!buffer.length || !buffer.pointer)		goto exit; 	obj = buffer.pointer;	if (obj->type != ACPI_TYPE_BUFFER ||	    obj->buffer.length < sizeof(struct acpi_subtable_header)) {		goto exit;	} 	header = (struct acpi_subtable_header *)obj->buffer.pointer;	if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {		map_lapic_id(header, acpi_id, &apic_id);	} else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {		map_lsapic_id(header, type, acpi_id, &apic_id);	} else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {		map_x2apic_id(header, type, acpi_id, &apic_id);	} exit:	kfree(buffer.pointer);	return apic_id;} int acpi_get_apicid(acpi_handle handle, int type, u32 acpi_id){	int apic_id; 	apic_id = map_mat_entry(handle, type, acpi_id);	if (apic_id == -1)		apic_id = map_madt_entry(type, acpi_id); 	return apic_id;} int acpi_map_cpuid(int apic_id, u32 acpi_id){#ifdef CONFIG_SMP	int i;#endif 	if (apic_id == -1) {		/*		 * On UP processor, there is no _MAT or MADT table.		 * So above apic_id is always set to -1.		 *		 * BIOS may define multiple CPU handles even for UP processor.		 * For example,		 *		 * Scope (_PR)                 * {		 *     Processor (CPU0, 0x00, 0x00000410, 0x06) {}		 *     Processor (CPU1, 0x01, 0x00000410, 0x06) {}		 *     Processor (CPU2, 0x02, 0x00000410, 0x06) {}		 *     Processor (CPU3, 0x03, 0x00000410, 0x06) {}		 * }		 *		 * Ignores apic_id and always returns 0 for the processor		 * handle with acpi id 0 if nr_cpu_ids is 1.		 * This should be the case if SMP tables are not found.		 * Return -1 for other CPU's handle.		 */		if (nr_cpu_ids <= 1 && acpi_id == 0)			return acpi_id;		else			return apic_id;	} #ifdef CONFIG_SMP	for_each_possible_cpu(i) {		if (cpu_physical_id(i) == apic_id)			return i;	}#else	/* In UP kernel, only processor 0 is valid */	if (apic_id == 0)		return apic_id;#endif	return -1;} int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id){	int apic_id; 	apic_id = acpi_get_apicid(handle, type, acpi_id); 	return acpi_map_cpuid(apic_id, acpi_id);}EXPORT_SYMBOL_GPL(acpi_get_cpuid);