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/*
 * Copyright (c) 2012, ARM Limited. All rights reserved.
 *       
 * Redistribution and use in source and binary forms, with
 * or without modification, are permitted provided that the
 * following conditions are met:
 *     
 * Redistributions of source code must retain the above
 * copyright notice, this list of conditions and the 
 * following disclaimer.
 *
 * Redistributions in binary form must reproduce the
 * above copyright notice, this list of conditions and 
 * the following disclaimer in the documentation 
 * and/or other materials provided with the distribution.
 *      
 * Neither the name of ARM nor the names of its
 * contributors may be used to endorse or promote products
 * derived from this software without specific prior written
 * permission.                        
 */

#ifndef __CACHE_GEOM_H__
#define __CACHE_GEOM_H__

#define MAX_CACHE_LEVELS 0x8

/* Target cpu cache relative to host cpu cache size */
#define TCSZ_EQUAL 0x0
#define TCSZ_SMALL 0x1
#define TCSZ_BIG   0x2

#define get_setway_reg(a, b , c, d, e) ((a << __clz(b)) | (c << (d + 4)) | (e << 1))
#define get_cache_type(clidr, lvl) ((clidr >> (lvl * 0x3)) & 0x7)
#define get_cache_level(reg) (reg >> 1) & 0x7
#define get_cache_linesz(cg, lvl) (cg->ccsidr[lvl] & 0x7)
#define get_cache_assoc(cg, lvl) ((cg->ccsidr[lvl] >> 3) & 0x3ff)
#define get_cache_numsets(cg, lvl) ((cg->ccsidr[lvl] >> 13) & 0x7fff)

/*
 * Data structure that stores the foreseeable differences
 * between the host and target caches at each implemented
 * cache level.
 * Absolute cache line numbers are calculated relative to
 * the cache line size of the smaller cache to get the 
 * maximum granularity.
 */
typedef struct cache_diff {
	/* Stores whether target cache is =,<,> host cache */
	unsigned csize_diff;
	/* 
	 * Stores factor by which target cache line 
	 * has to be multiplied to get absolute line
	 * no.
	 */
	unsigned tcline_factor;
	/* 
	 * Stores factor by which absolute cache line 
	 * no. has to be divided to get host cache line
	 * no.
	 */
	unsigned hcline_factor;
	/* Max absolute target cpu cache line number */
	unsigned tnumabs_clines;
	/* Max absolute host cpu cache line number */
	unsigned hnumabs_clines;
} cache_diff;

/*
 * Data structure that defines the cache topology of a cpu
 */
typedef struct cache_geom {
	unsigned clidr;
	/* 
	 * One for each cpu to store the cache level
	 * the OS thinks its operating on.
	 */
	unsigned csselr;
	/* One for each cache level */
	unsigned ccsidr[MAX_CACHE_LEVELS];
} cache_geometry;

/*
 * Data structure to hold cache virtualisation statistics.
 * Reset for each switchover.
 */
typedef struct cache_stats {
	/* Number of cm ops which did not cover the whole cache */
	unsigned part_cmop_cnt;
	/* Number of cm ops which spanned the entire cache */
	unsigned cmpl_cmop_cnt;
} cache_stats;

extern unsigned map_cache_geometries(cache_geometry *,
				     cache_geometry *, cache_diff *);
extern void find_cache_geometry(cache_geometry *);
extern void find_cache_diff(cache_geometry *, cache_geometry *, cache_diff *);
extern void handle_cm_op(unsigned,
			 void (*)(unsigned),
			 cache_geometry *, cache_geometry *, cache_diff *);

#endif				/* __CACHE_GEOM_H__ */