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/* $Id: cache.h,v 1.1 2005-12-20 11:32:11 jcastillo Exp $
 * cache.h:  Cache specific code for the Sparc.  These include flushing
 *           and direct tag/data line access.
 *
 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
 */
 
#ifndef _SPARC_CACHE_H
#define _SPARC_CACHE_H
 
#include <asm/asi.h>
 
/* Direct access to the instruction cache is provided through and
 * alternate address space.  The IDC bit must be off in the ICCR on
 * HyperSparcs for these accesses to work.  The code below does not do
 * any checking, the caller must do so.  These routines are for
 * diagnostics only, but could end up being useful.  Use with care.
 * Also, you are asking for trouble if you execute these in one of the
 * three instructions following a %asr/%psr access or modification.
 */
 
/* First, cache-tag access. */
extern inline unsigned int get_icache_tag(int setnum, int tagnum)
{
	unsigned int vaddr, retval;
 
	vaddr = ((setnum&1) << 12) | ((tagnum&0x7f) << 5);
	__asm__ __volatile__("lda [%1] %2, %0\n\t" :
			     "=r" (retval) :
			     "r" (vaddr), "i" (ASI_M_TXTC_TAG));
	return retval;
}
 
extern inline void put_icache_tag(int setnum, int tagnum, unsigned int entry)
{
	unsigned int vaddr;
 
	vaddr = ((setnum&1) << 12) | ((tagnum&0x7f) << 5);
	__asm__ __volatile__("sta %0, [%1] %2\n\t" : :
			     "r" (entry), "r" (vaddr), "i" (ASI_M_TXTC_TAG) :
			     "memory");
}
 
/* Second cache-data access.  The data is returned two-32bit quantities
 * at a time.
 */
extern inline void get_icache_data(int setnum, int tagnum, int subblock,
			      unsigned int *data)
{
	unsigned int value1, value2, vaddr;
 
	vaddr = ((setnum&0x1) << 12) | ((tagnum&0x7f) << 5) |
		((subblock&0x3) << 3);
	__asm__ __volatile__("ldda [%2] %3, %%g2\n\t"
			     "or %%g0, %%g2, %0\n\t"
			     "or %%g0, %%g3, %1\n\t" :
			     "=r" (value1), "=r" (value2) :
			     "r" (vaddr), "i" (ASI_M_TXTC_DATA) :
			     "g2", "g3");
	data[0] = value1; data[1] = value2;
}
 
extern inline void put_icache_data(int setnum, int tagnum, int subblock,
			      unsigned int *data)
{
	unsigned int value1, value2, vaddr;
 
	vaddr = ((setnum&0x1) << 12) | ((tagnum&0x7f) << 5) |
		((subblock&0x3) << 3);
	value1 = data[0]; value2 = data[1];
	__asm__ __volatile__("or %%g0, %0, %%g2\n\t"
			     "or %%g0, %1, %%g3\n\t"
			     "stda %%g2, [%2] %3\n\t" : :
			     "r" (value1), "r" (value2), 
			     "r" (vaddr), "i" (ASI_M_TXTC_DATA) :
			     "g2", "g3", "memory" /* no joke */);
}
 
/* Different types of flushes with the ICACHE.  Some of the flushes
 * affect both the ICACHE and the external cache.  Others only clear
 * the ICACHE entries on the cpu itself.  V8's (most) allow
 * granularity of flushes on the packet (element in line), whole line,
 * and entire cache (ie. all lines) level.  The ICACHE only flushes are
 * ROSS HyperSparc specific and are in ross.h
 */
 
/* Flushes which clear out both the on-chip and external caches */
extern inline void flush_ei_page(unsigned int addr)
{
	__asm__ __volatile__("sta %%g0, [%0] %1\n\t" : :
			     "r" (addr), "i" (ASI_M_FLUSH_PAGE) :
			     "memory");
}
 
extern inline void flush_ei_seg(unsigned int addr)
{
	__asm__ __volatile__("sta %%g0, [%0] %1\n\t" : :
			     "r" (addr), "i" (ASI_M_FLUSH_SEG) :
			     "memory");
}
 
extern inline void flush_ei_region(unsigned int addr)
{
	__asm__ __volatile__("sta %%g0, [%0] %1\n\t" : :
			     "r" (addr), "i" (ASI_M_FLUSH_REGION) :
			     "memory");
}
 
extern inline void flush_ei_ctx(unsigned int addr)
{
	__asm__ __volatile__("sta %%g0, [%0] %1\n\t" : :
			     "r" (addr), "i" (ASI_M_FLUSH_CTX) :
			     "memory");
}
 
extern inline void flush_ei_user(unsigned int addr)
{
	__asm__ __volatile__("sta %%g0, [%0] %1\n\t" : :
			     "r" (addr), "i" (ASI_M_FLUSH_USER) :
			     "memory");
}
 
#endif /* !(_SPARC_CACHE_H) */