var_cache.h

开放源码实时操作系统源码.

    cyg_uint32 __base = (cyg_uint32)(_base_);                                 \
    cyg_int32 __l = ((__base / HAL_DCACHE_LINE_SIZE) % HAL_DCACHE_SETS);      \
    cyg_int32 __count = ((_size_) / HAL_DCACHE_LINE_SIZE);                    \
    HAL_DCACHE_DISABLE();                                                     \
    HAL_DCACHE_SYNC ();                                                       \
    HAL_DCACHE_INVALIDATE_ALL ();                                             \
    HAL_DCACHE_ENABLE();                                                      \
    do {                                                                      \
        asm volatile ("lbz   %0,0(%1);"                                       \
                      "sync;"                                                 \
                      "mtspr %2, %4;"                                         \
                      "mtspr %3, %5;"                                         \
                      : /* %0 */ "=&r" (__scratch)                            \
                      : /* %1 */ "b" (__base),                                \
                        /* %2 */ "I" (CYGARC_REG_DC_ADR),                     \
                        /* %3 */ "I" (CYGARC_REG_DC_CST),                     \
                        /* %4 */ "r" (CYGARC_REG_DC_ADR_WAY0                  \
                                      |(__l<<CYGARC_REG_DC_ADR_SETID_SHIFT)), \
                        /* %5 */ "r" (CYGARC_REG_DC_CMD_LL));                 \
        __l++;                                                                \
        __base += HAL_DCACHE_LINE_SIZE;                                       \
    } while (__count--);                                                      \
    CYG_MACRO_END

        
// Undo a previous lock operation

// Implementation: Unlocks entire cache.

#define HAL_DCACHE_UNLOCK(_base_, _size_)               \
    HAL_DCACHE_UNLOCK_ALL()    


// Unlock entire cache
#define HAL_DCACHE_UNLOCK_ALL()                         \
    CYG_MACRO_START                                     \
    asm volatile ("sync;"                               \
                  "mtspr %0, %1;"                       \
                  : : "I" (CYGARC_REG_DC_CST),          \
                      "r" (CYGARC_REG_DC_CMD_UA));      \
    CYG_MACRO_END
   


//-----------------------------------------------------------------------------
// 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()                     \
    asm volatile ("isync;"                      \
                  "mtspr %0, %1;"               \
                  "isync"                       \
                  : : "I" (CYGARC_REG_IC_CST), "r" (CYGARC_REG_IC_CMD_CE))

// Disable the instruction cache
#define HAL_ICACHE_DISABLE()                    \
    asm volatile ("isync;"                      \
                  "mtspr %0, %1;"               \
                  "isync"                       \
                  : : "I" (CYGARC_REG_IC_CST), "r" (CYGARC_REG_IC_CMD_CD))

// Invalidate the entire cache
#define HAL_ICACHE_INVALIDATE_ALL()                     \
    asm volatile ("isync;"                              \
                  "mtspr %0, %1;"                       \
                  "isync"                               \
                  : : "I" (CYGARC_REG_IC_CST),          \
                      "r" (CYGARC_REG_IC_CMD_IA))

// 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_)                          \
    asm volatile ("mfspr  %0, %1;"                              \
                  "rlwinm %0,%0,1,31,31;"                       \
                  : "=r" (_state_) : "I" (CYGARC_REG_IC_CST))

// 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.

// Restrictions: This implementation only allows a single area to be
// locked at any one time. This area must be 2kB or less in size.

// Implementation: Flush entire cache, then invalidate it. This
// ensures that the fetched data go into way0.

#define HAL_ICACHE_LOCK(_base_, _size_)                                       \
    CYG_MACRO_START                                                           \
    unsigned long __base =                                                    \
        ((unsigned long) (_base_)) & ~(HAL_ICACHE_LINE_SIZE-1);               \
    int __count = ((_size_) / HAL_ICACHE_LINE_SIZE);                          \
    do {                                                                      \
        asm volatile ("mtspr %0, %2;"                                         \
                      "mtspr %1, %3;"                                         \
                      "isync;"                                                \
                      : /* no output */                                       \
                      : /* %0 */ "I" (CYGARC_REG_IC_ADR),                     \
                        /* %1 */ "I" (CYGARC_REG_IC_CST),                     \
                        /* %2 */ "r" (__base),                                \
                        /* %3 */ "r" (CYGARC_REG_IC_CMD_LL));                 \
        __base += HAL_ICACHE_LINE_SIZE;                                       \
    } while (__count--);                                                      \
    CYG_MACRO_END

// Undo a previous lock operation

// Implementation: Unlocks entire cache.
#define HAL_ICACHE_UNLOCK(_base_, _size_)       \
    HAL_ICACHE_UNLOCK_ALL()

// Unlock entire cache
#define HAL_ICACHE_UNLOCK_ALL()                         \
    CYG_MACRO_START                                     \
    asm volatile ("sync;"                               \
                  "mtspr %0, %1;"                       \
                  : : "I" (CYGARC_REG_IC_CST),          \
                      "r" (CYGARC_REG_IC_CMD_UA));      \
    CYG_MACRO_END

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

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

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