var_cache.h

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#ifndef CYGONCE_VAR_CACHE_H
#define CYGONCE_VAR_CACHE_H

//=============================================================================
//
//      var_cache.h
//
//      HAL cache control API
//
//=============================================================================
//####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
//
// eCos is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 2 or (at your option) any later version.
//
// eCos is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License along
// with eCos; if not, write to the Free Software Foundation, Inc.,
// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
//
// As a special exception, if other files instantiate templates or use macros
// or inline functions from this file, or you compile this file and link it
// with other works to produce a work based on this file, this file does not
// by itself cause the resulting work to be covered by the GNU General Public
// License. However the source code for this file must still be made available
// in accordance with section (3) of the GNU General Public License.
//
// This exception does not invalidate any other reasons why a work based on
// this file might be covered by the GNU General Public License.
//
// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
// at http://sources.redhat.com/ecos/ecos-license/
// -------------------------------------------
//####ECOSGPLCOPYRIGHTEND####
//=============================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):   nickg
// Contributors:        nickg
// Date:        1998-02-17
// Purpose:     Cache control API
// Description: The macros defined here provide the HAL APIs for handling
//              cache control operations.
// Usage:
//              #include <cyg/hal/var_cache.h>
//              ...
//              
//
//####DESCRIPTIONEND####
//
//=============================================================================

#include <pkgconf/hal.h>
#include <cyg/infra/cyg_type.h>

#include <cyg/hal/plf_cache.h>

//-----------------------------------------------------------------------------
// Cache sizes.

// Data cache
#define HAL_DCACHE_SIZE                 (8*1024)        // Size of data cache in bytes
#define HAL_DCACHE_LINE_SIZE            16              // Size of a data cache line
#define HAL_DCACHE_WAYS                 1               // Associativity of the cache

// Instruction cache
#define HAL_ICACHE_SIZE                 (16*1024)       // Size of cache in bytes
#define HAL_ICACHE_LINE_SIZE            32              // Size of a cache line
#define HAL_ICACHE_WAYS                 1               // Associativity of the cache

#define HAL_DCACHE_SETS (HAL_DCACHE_SIZE/(HAL_DCACHE_LINE_SIZE*HAL_DCACHE_WAYS))
#define HAL_ICACHE_SETS (HAL_ICACHE_SIZE/(HAL_ICACHE_LINE_SIZE*HAL_ICACHE_WAYS))

//-----------------------------------------------------------------------------
// The VR4300 mostly uses the default MIPS cache controls defined in hal_cache.h
// Here we define the cache enable and disable macros. The only control we appear
// to have is the kseg0 cache state in config0. So all these macros at present
// manipulate this.

#ifndef HAL_DCACHE_ENABLE_DEFINED
#define HAL_DCACHE_ENABLE()                     \
CYG_MACRO_START                                 \
    asm volatile ( "mfc0   $2,$16\n"            \
                   "nop; nop; nop\n"            \
                   "la     $3,0xFFFFFFF8\n"     \
                   "and    $2,$2,$3\n"          \
                   "ori    $2,$2,3\n"           \
                   "mtc0   $2,$16\n"            \
                   "nop; nop; nop;\n"           \
                   :                            \
                   :                            \
                   : "$2", "$3"                 \
                   );                           \
CYG_MACRO_END
#define HAL_DCACHE_ENABLE_DEFINED
#endif

// Disable the data cache
#ifndef HAL_DCACHE_DISABLE_DEFINED
#define HAL_DCACHE_DISABLE()                    \
CYG_MACRO_START                                 \
    asm volatile ( "mfc0   $2,$16\n"            \
                   "nop; nop; nop\n"            \
                   "la     $3,0xFFFFFFF8\n"     \
                   "and    $2,$2,$3\n"          \
                   "ori    $2,$2,2\n"           \
                   "mtc0   $2,$16\n"            \
                   "nop; nop; nop;\n"           \
                   :                            \
                   :                            \
                   : "$2", "$3"                 \
                   );                           \
CYG_MACRO_END
#define HAL_DCACHE_DISABLE_DEFINED
#endif

#ifndef HAL_DCACHE_IS_ENABLED_DEFINED
#define HAL_DCACHE_IS_ENABLED(_state_)          \
CYG_MACRO_START                                 \
    CYG_WORD32 _cstate_;                        \
    asm volatile ( "mfc0   %0,$16\n"            \
                   : "=r"(_cstate_)             \
                   );                           \
    if( (_cstate_ & 7) == 2 ) _state_ = 0;      \
    else _state_ = 1;                           \
CYG_MACRO_END
#define HAL_DCACHE_IS_ENABLED_DEFINED
#endif

#ifndef HAL_ICACHE_ENABLE_DEFINED
#define HAL_ICACHE_ENABLE() HAL_DCACHE_ENABLE()
#define HAL_ICACHE_ENABLE_DEFINED
#endif

// Disable the instruction cache
#ifndef HAL_ICACHE_DISABLE_DEFINED
#define HAL_ICACHE_DISABLE() HAL_DCACHE_DISABLE()
#define HAL_ICACHE_DISABLE_DEFINED
#endif

#ifndef HAL_ICACHE_IS_ENABLED_DEFINED
#define HAL_ICACHE_IS_ENABLED(_state_) HAL_DCACHE_IS_ENABLED(_state_)
#define HAL_ICACHE_IS_ENABLED_DEFINED
#endif

//-----------------------------------------------------------------------------
// The VR4300 has no cache locking facility so we define the guard macros
// to disable the definitions in hal_arch.h.

#define HAL_DCACHE_LOCK_DEFINED
#define HAL_DCACHE_UNLOCK_DEFINED
#define HAL_DCACHE_UNLOCK_ALL_DEFINED

#define HAL_ICACHE_LOCK_DEFINED
#define HAL_ICACHE_UNLOCK_DEFINED

//-----------------------------------------------------------------------------
#endif // ifndef CYGONCE_VAR_CACHE_H
// End of var_cache.h