//
// Cforall Version 1.0.0 Copyright (C) 2021 University of Waterloo
//
// The contents of this file are covered under the licence agreement in the
// file "LICENCE" distributed with Cforall.
//
// cpu.hfa -- read the data structure
//
// Author           : Thierry Delisle
// Created On       : Fri Jun 11 15:22:23 2021
// Last Modified By :
// Last Modified On :
// Update Count     :
//

#pragma once

#include <stddef.h>

// Map from cpu entry to a structure detailling cpus with common topologies
// Note that the cpu-groups are contiguous so the indexing is different from
// the cpu indexing
struct cpu_map_entry_t {
	// Where this particular cpu is in the group
	unsigned self;

	// Starting index of the cpus with the same topology
	unsigned start;

	// Number of cpus with the same topology
	unsigned count;

	// Index of the cache this entry describes
	unsigned cache;
};

struct cpu_info_t {
	// Array of size [hthrd_count]
	const cpu_map_entry_t * llc_map;

	// Number of _hardware_ threads present in the system
	size_t hthrd_count;

	// Number of distinct last level caches
	size_t llc_count;
};

extern cpu_info_t cpu_info;