hal_cache.h

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// 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                                 \
    HAL_DCACHE_STORE( _base_ , _size_ );        \
    HAL_DCACHE_INVALIDATE( _base_ , _size_ );   \
CYG_MACRO_END

// Invalidate cache lines in the given range without writing to memory.
#define HAL_DCACHE_INVALIDATE( _base_ , _size_ )                        \
CYG_MACRO_START                                                         \
    register int addr, enda;                                            \
    for ( addr = (~(HAL_DCACHE_LINE_SIZE - 1)) & (int)(_base_),         \
              enda = (int)(_base_) + (_size_);                          \
          addr < enda ;                                                 \
          addr += HAL_DCACHE_LINE_SIZE )                                \
    {                                                                   \
        asm volatile (                                                  \
                      "mcr  p15,0,%0,c7,c6,1;" /* flush entry away */   \
                      :                                                 \
                      : "r"(addr)                                       \
                      : "memory"                                        \
            );                                                          \
    }                                                                   \
CYG_MACRO_END
                          
// Write dirty cache lines to memory for the given address range.
#define HAL_DCACHE_STORE( _base_ , _size_ )                             \
CYG_MACRO_START                                                         \
    register int addr, enda;                                            \
    for ( addr = (~(HAL_DCACHE_LINE_SIZE - 1)) & (int)(_base_),         \
              enda = (int)(_base_) + (_size_);                          \
          addr < enda ;                                                 \
          addr += HAL_DCACHE_LINE_SIZE )                                \
    {                                                                   \
        asm volatile ("mcr  p15,0,%0,c7,c10,1;" /* push entry to RAM */ \
                      :                                                 \
                      : "r"(addr)                                       \
                      : "memory"                                        \
            );                                                          \
    }                                                                   \
    /* and also drain the write buffer */                               \
    asm volatile (                                                      \
        "mov    r1,#0;"                                                 \
        "mcr    p15,0,r1,c7,c10,4;"                                     \
        :                                                               \
        :                                                               \
        : "r1", "memory" );                                             \
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_ )

// Preread the given range into the cache with the intention of writing
// to it later.
//#define HAL_DCACHE_WRITE_HINT( _base_ , _size_ )

// Allocate and zero the cache lines associated with the given range.
//#define HAL_DCACHE_ZERO( _base_ , _size_ )

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

// Enable the instruction cache
#define HAL_ICACHE_ENABLE()                                             \
CYG_MACRO_START                                                         \
    /* SA-110 manual states that the control reg is read-write */       \
    asm volatile (                                                      \
        "mrc  p15,0,r1,c1,c0,0;"                                        \
        "orr  r1,r1,#0x0003;" /* ensure MM is enabled */                \
        "orr  r1,r1,#0x1000;" /* enable ICache */                       \
        "mcr  p15,0,r1,c1,c0,0"                                         \
        :                                                               \
        :                                                               \
        : "r1" /* Clobber list */                                       \
        );                                                              \
CYG_MACRO_END

// Disable the instruction cache (and invalidate it, required semanitcs)
#define HAL_ICACHE_DISABLE()                                            \
CYG_MACRO_START                                                         \
    /* SA-110 manual states that the control reg is read-write */       \
    asm volatile (                                                      \
        "mrc    p15,0,r1,c1,c0,0;"                                      \
        "bic    r1,r1,#0x1000;" /* but leave MM alone */                \
        "mcr    p15,0,r1,c1,c0,0;"                                      \
        "mov    r1, #0;"                                                \
        "mcr    p15,0,r1,c7,c5,0;"  /* clear instruction cache */       \
        "nop;" /* next few instructions may be via cache */             \
        "nop;"                                                          \
        "nop;"                                                          \
        "nop;"                                                          \
        "nop;"                                                          \
        "nop"                                                           \
        :                                                               \
        :                                                               \
        : "r1" /* Clobber list */                                       \
        );                                                              \
CYG_MACRO_END

// Invalidate the entire cache
#define HAL_ICACHE_INVALIDATE_ALL()                                     \
CYG_MACRO_START                                                         \
    /* this macro can discard dirty cache lines (N/A for ICache) */     \
    asm volatile (                                                      \
        "mov    r1, #0;"                                                \
        "mcr    p15,0,r1,c7,c5,0;"  /* clear instruction cache */       \
        "mcr    p15,0,r1,c8,c5,0;"  /* flush I TLB only */              \
        "nop;" /* next few instructions may be via cache */             \
        "nop;"                                                          \
        "nop;"                                                          \
        "nop;"                                                          \
        "nop;"                                                          \
        "nop"                                                           \
        :                                                               \
        :                                                               \
        : "r1" /* Clobber list */                                       \
        );                                                              \
CYG_MACRO_END
     

// Synchronize the contents of the cache with memory.
// (which includes flushing out pending writes)
#define HAL_ICACHE_SYNC()                                       \
CYG_MACRO_START                                                 \
    HAL_DCACHE_SYNC(); /* ensure data gets to RAM */            \
    HAL_ICACHE_INVALIDATE_ALL(); /* forget all we know */       \
CYG_MACRO_END

// Query the state of the instruction cache
#define HAL_ICACHE_IS_ENABLED(_state_)                                  \
CYG_MACRO_START                                                         \
    /* SA-110 manual states clearly that the control reg is readable */ \
    register cyg_uint32 reg;                                            \
    asm volatile ("mrc  p15,0,%0,c1,c0,0"                               \
                  : "=r"(reg)                                           \
                  :                                                     \
                /*:*/                                                   \
        );                                                              \
    (_state_) = (0 != (0x1000 & reg)); /* Bit 12 is ICache enable */    \
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_ )

//-----------------------------------------------------------------------------
#endif // ifndef CYGONCE_HAL_CACHE_H
// End of hal_cache.h