hal_cache.h

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#ifndef CYGONCE_HAL_CACHE_H
#define CYGONCE_HAL_CACHE_H

//=============================================================================
//
//      hal_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/hal_cache.h>
//              ...
//              
//
//####DESCRIPTIONEND####
//
//=============================================================================

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

#include <cyg/hal/var_cache.h>

// Use this macro to allow the assembler to accept "cache" instructions,
// which are MIPS ISA 3. This is useful if someone is compiling
// with -mips2, but the architecture is really MIPS ISA 3.

#define _hal_asm_mips_cpp_stringize( _x_ ) #_x_
#define _HAL_ASM_SET_MIPS_ISA( _isal_ ) asm volatile ( \
      ".set mips" _hal_asm_mips_cpp_stringize(_isal_) )


//=============================================================================
// Default Implementation. This uses the standard MIPS CP0 registers and
// cache instructions. Note that not all variants will have all of the
// functionality defined here. 

//-----------------------------------------------------------------------------
// Cache dimensions.
// These really should be defined in var_cache.h. If they are not, then provide
// a set of numbers that are typical of many variants.

#ifndef HAL_DCACHE_SIZE

// Data cache
#define HAL_DCACHE_SIZE                 4096    // Size of data cache in bytes
#define HAL_DCACHE_LINE_SIZE            16      // Size of a data cache line
#define HAL_DCACHE_WAYS                 2       // Associativity of the cache

// Instruction cache
#define HAL_ICACHE_SIZE                 4096    // Size of cache in bytes
#define HAL_ICACHE_LINE_SIZE            16      // Size of a cache line
#define HAL_ICACHE_WAYS                 2       // 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))

#endif

//-----------------------------------------------------------------------------
// Cache instruction uses LSBs or MSBs (depending on the
// implementation) of the virtual address to specify which WAY to
// affect. The _ALL_WAYS macro defines the necessary cache instructions
// to affect all ways.

#ifdef HAL_MIPS_CACHE_INSN_USES_LSB
# define _IWAY(_n_) ((_n_)*HAL_ICACHE_SIZE/HAL_ICACHE_WAYS+(_n_))
# define _DWAY(_n_) ((_n_)*HAL_DCACHE_SIZE/HAL_DCACHE_WAYS+(_n_))
#else
# define _IWAY(_n_) ((_n_)*HAL_ICACHE_SIZE/HAL_ICACHE_WAYS)
# define _DWAY(_n_) ((_n_)*HAL_DCACHE_SIZE/HAL_DCACHE_WAYS)
#endif

#if (HAL_DCACHE_WAYS == 1)
#define _HAL_ASM_DCACHE_ALL_WAYS( _cmd_ , _addr_ )       \
    asm volatile ("cache %0,0(%1);"                      \
                    : : "I" ((_cmd_) | 1), "r"(_addr_) )
#elif (HAL_DCACHE_WAYS == 2)
#define _HAL_ASM_DCACHE_ALL_WAYS( _cmd_ , _addr_ )      \
    asm volatile ("cache %0,0(%1);"                     \
                  "cache %0,%2(%1);"                    \
                    : : "I" ((_cmd_) | 1), "r"(_addr_), \
                        "I" (_DWAY(1)))
#elif (HAL_DCACHE_WAYS == 4)
#define _HAL_ASM_DCACHE_ALL_WAYS( _cmd_ , _addr_ )      \
    asm volatile ("cache %0,0(%1);"                     \
                  "cache %0,%2(%1);"                    \
                  "cache %0,%3(%1);"                    \
                  "cache %0,%4(%1);"                    \
                    : : "I" ((_cmd_) | 1), "r"(_addr_), \
                        "I" (_DWAY(1)),                  \
                        "I" (_DWAY(2)),                  \
                        "I" (_DWAY(3)))
#else
# error "Unsupported number of ways"
#endif

#if (HAL_ICACHE_WAYS == 1)
#define _HAL_ASM_ICACHE_ALL_WAYS( _cmd_ , _addr_ )       \
    asm volatile ("cache %0,0(%1);"                      \
                    : : "I" (_cmd_), "r"(_addr_) )
#elif (HAL_ICACHE_WAYS == 2)
#define _HAL_ASM_ICACHE_ALL_WAYS( _cmd_ , _addr_ )      \
    asm volatile ("cache %0,0(%1);"                     \
                  "cache %0,%2(%1);"                    \
                    : : "I" (_cmd_), "r"(_addr_),       \
                        "I" (_IWAY(1)))
#elif (HAL_ICACHE_WAYS == 4)
#define _HAL_ASM_ICACHE_ALL_WAYS( _cmd_ , _addr_ )      \
    asm volatile ("cache %0,0(%1);"                     \
                  "cache %0,%2(%1);"                    \
                  "cache %0,%3(%1);"                    \
                  "cache %0,%4(%1);"                    \
                    : : "I" (_cmd_), "r"(_addr_),       \
                        "I" (_IWAY(1)),                  \
                        "I" (_IWAY(2)),                  \
                        "I" (_IWAY(3)))
#else
# error "Unsupported number of ways"
#endif

//-----------------------------------------------------------------------------
// Address adjustment.
// Given an address and a size, these macros return the first 
// cacheline containing the requested range and a terminating address.

#define HAL_DCACHE_START_ADDRESS(_addr_) \
(((CYG_ADDRESS)(_addr_)) & ~(HAL_DCACHE_LINE_SIZE-1))

#define HAL_DCACHE_END_ADDRESS(_addr_, _asize_) \
((CYG_ADDRESS)((_addr_) + (_asize_)))

#define HAL_ICACHE_START_ADDRESS(_addr_) \
(((CYG_ADDRESS)(_addr_)) & ~(HAL_ICACHE_LINE_SIZE-1))

#define HAL_ICACHE_END_ADDRESS(_addr_, _asize_) \
((CYG_ADDRESS)((_addr_) + (_asize_)))

//-----------------------------------------------------------------------------
// Global control of data cache

// Enable the data cache
// There is no default mechanism for enabling or disabling the caches.
#ifndef HAL_DCACHE_ENABLE_DEFINED
#define HAL_DCACHE_ENABLE()
#endif

// Disable the data cache
#ifndef HAL_DCACHE_DISABLE_DEFINED
#define HAL_DCACHE_DISABLE()
#endif

#ifndef HAL_DCACHE_IS_ENABLED_DEFINED
#define HAL_DCACHE_IS_ENABLED(_state_) (_state_) = 1;
#endif

// Invalidate the entire cache
// We simply use HAL_DCACHE_SYNC() to do this. For writeback caches this
// is not quite what we want, but there is no index-invalidate operation
// available.
#ifndef HAL_DCACHE_INVALIDATE_ALL_DEFINED
#define HAL_DCACHE_INVALIDATE_ALL() HAL_DCACHE_SYNC()
#endif

// Synchronize the contents of the cache with memory.
// This uses the index-writeback-invalidate operation.
#ifndef HAL_DCACHE_SYNC_DEFINED
#define HAL_DCACHE_SYNC()                                               \
    CYG_MACRO_START                                                     \
    register CYG_ADDRESS _baddr_ = 0x80000000;                          \
    register CYG_ADDRESS _addr_ = 0x80000000;                           \
    register CYG_WORD _size_ = HAL_DCACHE_SIZE;                         \
    _HAL_ASM_SET_MIPS_ISA(3);                                           \
    for( ; _addr_ <= _baddr_+_size_; _addr_ += HAL_DCACHE_LINE_SIZE )   \