var_cache.h

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#ifndef CYGONCE_VAR_CACHE_H
#define CYGONCE_VAR_CACHE_H
//=============================================================================
//
//      var_cache.h
//
//      Variant 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.
// Copyright (C) 2002, 2003 Gary Thomas
//
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// the terms of the GNU General Public License as published by the Free
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// 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
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// at http://sources.redhat.com/ecos/ecos-license/
// -------------------------------------------
//####ECOSGPLCOPYRIGHTEND####
//=============================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):   nickg
// Contributors:nickg, jskov
// Date:        2000-04-02
// Purpose:     Variant cache control API
// Description: The macros defined here provide the HAL APIs for handling
//              cache control operations on the PPC60x variant CPUs.
// Usage:       Is included via the architecture cache header:
//              #include <cyg/hal/hal_cache.h>
//              ...
//
//####DESCRIPTIONEND####
//
//=============================================================================

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

#include <cyg/hal/ppc_regs.h>

#include <cyg/hal/plf_cache.h>


//-----------------------------------------------------------------------------
// Cache dimensions

#if defined(CYGHWR_HAL_POWERPC_PPC4XX_403)
// Data cache
#define HAL_DCACHE_SIZE                 8192    // 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                 16384   // 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
#endif  // 403

#if defined(CYGHWR_HAL_POWERPC_PPC4XX_405) || defined(CYGHWR_HAL_POWERPC_PPC4XX_405GP)
// Data cache
#define HAL_DCACHE_SIZE                 (16*1024) // Size of data cache in bytes
#define HAL_DCACHE_LINE_SIZE            32        // Size of a data cache line
#define HAL_DCACHE_WAYS                 2         // 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                 2         // Associativity of the cache
#endif // 405

#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))

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

// Enable the data cache - this is implicit whenever the MMU is turned on
#define HAL_DCACHE_ENABLE()

// Disable the data cache
#define HAL_DCACHE_DISABLE()

// Invalidate the entire cache
#define HAL_DCACHE_INVALIDATE_ALL()                             \
    CYG_MACRO_START                                             \
    int _i_, _ix_, _indx_;                                      \
    _indx_ = 0;                                                 \
    _ix_ = HAL_DCACHE_SIZE/2;                                   \
    for (_i_ = 0;  _i_ < HAL_DCACHE_SETS;  _i_++) {             \
        asm volatile ("dccci 0,%0;" :: "r"(_indx_));             \
        asm volatile ("dccci %1,%0;" :: "r"(_indx_), "r"(_ix_)); \
        _indx_ += HAL_DCACHE_LINE_SIZE;                         \
    }                                                           \
    CYG_MACRO_END

#if 0
// Synchronize the contents of the cache with memory.                                   
#define HAL_DCACHE_SYNC()                                                               \
    CYG_MACRO_START                                                                     \
    int _indx_;                                                                         \
    for (_indx_ = 0;  _indx_ < HAL_DCACHE_SIZE;  _indx_ += HAL_DCACHE_LINE_SIZE) {      \
        asm volatile ("dcbf 0,%0;" :: "r"(_indx_));                                     \
    }                                                                                   \
    CYG_MACRO_END
#else
// Synchronize the contents of the cache with memory.
#define HAL_DCACHE_SYNC()                                                     \
    CYG_MACRO_START                                                           \
    cyg_int32 i;                                                              \
    cyg_uint32 *__base = (cyg_uint32 *) (0);                  \
/*    for (i = 0;  i < HAL_DCACHE_SIZE;  i += sizeof(cyg_uint32)) {      */ \
    for (i = 0; i < (HAL_DCACHE_SIZE/HAL_DCACHE_LINE_SIZE); i++, __base += HAL_DCACHE_LINE_SIZE/4){\
        asm volatile ("lwz %%r0,0(%0)" : : "r" (__base) : "r0");      \
    }                                                                         \
    CYG_MACRO_END
#endif

// Query the state of the data cache
#define HAL_DCACHE_IS_ENABLED(_state_)          \
    CYG_MACRO_START                             \
    (_state_) = 1;                              \
    CYG_MACRO_END

// Set the data cache refill burst size
//#define HAL_DCACHE_BURST_SIZE(_size_)

// Set the data cache write mode
//#define HAL_DCACHE_WRITE_MODE( _mode_ )

//#define HAL_DCACHE_WRITETHRU_MODE       0
//#define HAL_DCACHE_WRITEBACK_MODE       1

// Load the contents of the given address range into the data cache
// and then lock the cache so that it stays there.
//#define HAL_DCACHE_LOCK(_base_, _size_)

// Undo a previous lock operation
//#define HAL_DCACHE_UNLOCK(_base_, _size_)

// Unlock entire cache
#define HAL_DCACHE_UNLOCK_ALL()

//-----------------------------------------------------------------------------
// Data cache line control

// Allocate cache lines for the given address range without reading its
// contents from memory.
//#define HAL_DCACHE_ALLOCATE( _base_ , _size_ )

// Write dirty cache lines to memory and invalidate the cache entries
// for the given address range.
#define HAL_DCACHE_FLUSH( _base_ , _size_ )                     \
    CYG_MACRO_START                                             \
    cyg_uint32 __base = (cyg_uint32) (_base_);                  \
    cyg_int32 __size = (cyg_int32) (_size_);                    \
    while (__size > 0) {                                        \
        asm volatile ("dcbf 0,%0;sync;" : : "r" (__base));      \
        __base += HAL_DCACHE_LINE_SIZE;                         \
        __size -= HAL_DCACHE_LINE_SIZE;                         \
    }                                                           \
    CYG_MACRO_END
   
// Invalidate cache lines in the given range without writing to memory.
#define HAL_DCACHE_INVALIDATE( _base_ , _size_ )                \
    CYG_MACRO_START                                             \
    cyg_uint32 __base = (cyg_uint32) (_base_);                  \
    cyg_int32 __size = (cyg_int32) (_size_);                    \
    while (__size > 0) {                                        \
        asm volatile ("dcbi 0,%0;sync;" : : "r" (__base));      \
        __base += HAL_DCACHE_LINE_SIZE;                         \
        __size -= HAL_DCACHE_LINE_SIZE;                         \
    }                                                           \
    CYG_MACRO_END

// Write dirty cache lines to memory for the given address range.
#define HAL_DCACHE_STORE( _base_ , _size_ )                     \
    CYG_MACRO_START                                             \
    cyg_uint32 __base = (cyg_uint32) (_base_);                  \
    cyg_int32 __size = (cyg_int32) (_size_);                    \
    while (__size > 0) {                                        \
        asm volatile ("dcbst 0,%0;sync;" : : "r" (__base));     \
        __base += HAL_DCACHE_LINE_SIZE;                         \
        __size -= HAL_DCACHE_LINE_SIZE;                         \
    }                                                           \
    CYG_MACRO_END

// Preread the given range into the cache with the intention of reading
// from it later.
#define HAL_DCACHE_READ_HINT( _base_ , _size_ )                 \
    CYG_MACRO_START                                             \
    cyg_uint32 __base = (cyg_uint32) (_base_);                  \
    cyg_int32 __size = (cyg_int32) (_size_);                    \
    while (__size > 0) {                                        \
        asm volatile ("dcbt 0,%0;" : : "r" (__base));           \
        __base += HAL_DCACHE_LINE_SIZE;                         \
        __size -= HAL_DCACHE_LINE_SIZE;                         \
    }                                                           \
    CYG_MACRO_END

// Preread the given range into the cache with the intention of writing
// to it later.
#define HAL_DCACHE_WRITE_HINT( _base_ , _size_ )                \
    CYG_MACRO_START                                             \
    cyg_uint32 __base = (cyg_uint32) (_base_);                  \
    cyg_int32 __size = (cyg_int32) (_size_);                    \
    while (__size > 0) {                                        \
        asm volatile ("dcbtst 0,%0;" : : "r" (__base));         \
        __base += HAL_DCACHE_LINE_SIZE;                         \
        __size -= HAL_DCACHE_LINE_SIZE;                         \
    }                                                           \
    CYG_MACRO_END

// Allocate and zero the cache lines associated with the given range.
#define HAL_DCACHE_ZERO( _base_ , _size_ )                      \
    CYG_MACRO_START                                             \
    cyg_uint32 __base = (cyg_uint32) (_base_);                  \
    cyg_int32 __size = (cyg_int32) (_size_);                    \
    while (__size > 0) {                                        \
        asm volatile ("dcbz 0,%0;" : : "r" (__base));           \
        __base += HAL_DCACHE_LINE_SIZE;                         \
        __size -= HAL_DCACHE_LINE_SIZE;                         \
    }                                                           \
    CYG_MACRO_END

//-----------------------------------------------------------------------------
// Global control of Instruction cache

// Enable the instruction cache
#define HAL_ICACHE_ENABLE()

// Disable the instruction cache
#define HAL_ICACHE_DISABLE()

// Invalidate the entire cache
#define HAL_ICACHE_INVALIDATE_ALL()                     \
    CYG_MACRO_START                                     \
    int _i_, _indx_;                                    \
    _indx_ = 0;                                         \
    for (_i_ = 0;  _i_ < HAL_ICACHE_SETS;  _i_++) {     \
        asm volatile ("iccci 0,%0;" :: "r"(_indx_));    \
        _indx_ += HAL_ICACHE_LINE_SIZE;                 \
    }                                                   \
    CYG_MACRO_END

// Synchronize the contents of the cache with memory.
#define HAL_ICACHE_SYNC()  HAL_ICACHE_INVALIDATE_ALL()

// Query the state of the instruction cache
#define HAL_ICACHE_IS_ENABLED(_state_)          \
    CYG_MACRO_START                             \
    (_state_) = 1;                              \
    CYG_MACRO_END

// Set the instruction cache refill burst size
//#define HAL_ICACHE_BURST_SIZE(_size_)

// Load the contents of the given address range into the instruction cache
// and then lock the cache so that it stays there.
//#define HAL_ICACHE_LOCK(_base_, _size_)

// Undo a previous lock operation
//#define HAL_ICACHE_UNLOCK(_base_, _size_)

// Unlock entire cache
#define HAL_ICACHE_UNLOCK_ALL()

//-----------------------------------------------------------------------------
// Instruction cache line control

// Invalidate cache lines in the given range without writing to memory.
//#define HAL_ICACHE_INVALIDATE( _base_ , _size_ )

#ifdef CYGHWR_HAL_POWERPC_ENABLE_MMU
// Map a RAM address to a non-cached mirror
#define CYGARC_UNCACHED_ADDRESS(p) ((unsigned long)(p) | 0x80000000)
#else
#define CYGARC_UNCACHED_ADDRESS(p) (p)
#endif

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