cpu.c

/******************************************************************************
 * $Revision: 423 $
 * $Date:: 2017-04-07 16:03:30 +0900#$
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/* __DISCLAIMER_START__                                                      */
/******************************************************************************
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/* __DISCLAIMER_END__                                                        */
/*****************************************************************************
 ** \file cpu.c
 **
 ** A detailed description is available at
 ** @link CpuGroup CPU Module description @endlink
 **
 ** History:
 **   - 2014-06-02  0.01  HS  Initial version for Traveo
 **   - 2014-11-21  0.02  CEy Added Cpu_InvalidateDCacheArea()
 *****************************************************************************/


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/* Include files                                                             */
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#include "common_include.h"

//#if defined(PDL_PERIPHERAL_CPU_ACTIVE)

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/* Local pre-processor symbols/macros ('define')                             */
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/* Global variable definitions (declared in header file with 'extern')       */
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/* Local type definitions ('typedef')                                        */
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/* Local variable definitions ('static')                                     */
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/* Local function prototypes ('static')                                      */
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/* Function implementation - global ('extern') and local ('static')          */
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/**
 *****************************************************************************
 ** \addtogroup CpuGroup CPU Mode Functions
 *****************************************************************************/
/* @{ */

/**
 *****************************************************************************
 ** \brief  Check if CPU is in privileged mode
 **
 ** \retval TRUE if CPU is any mode other than the user mode
 **         FALSE if CPU is in user mode
 *****************************************************************************/
boolean_t Cpu_CpuIsInPrivilegedMode(void)
{
    return (Cpu_GetSystemMode() != (uint32_t)CpuUserMode) ? TRUE : FALSE ;
} /* Cpu_CpuIsInPrivilegedMode */


/**
 *****************************************************************************
 ** \brief    Function to read the current system mode.
 **
 ** This needs to be done in assembler since the compiler intrinsic functions
 ** to read CPSR are only allowed in privileged mode. This routine also runs in
 ** user mode.
 *****************************************************************************/
uint32_t Cpu_GetSystemMode(void)
{
    uint32_t u32Cpsr ;
    u32Cpsr = GET_CPSR();
    return (u32Cpsr & 0x0000001F);
} /* Cpu_GetSystemMode */


/**
 *****************************************************************************
 ** \brief  Invalidates the cache content of certain memory area
 **
 ** If the content of a cached RAM area has been changed by a different master
 ** than the CPU, this function can be used to invalidate the cache content of
 ** this area, so that the CPU can work with the updated data.
 ** Alternatively, this memory area could be assigned a non-cacheable attribute
 ** by using the Cortex-R5 MPU
 **
 ** \note This function expects arguments based on the cache line granularity
 **       (1 cache line is 32 bytes), so that user does not invalidate other
 **       areas by accident
 **
 ** \retval Ok                    Invalidation was successful
 ** \retval ErrorInvalidParameter If one of the following conditions are met:
 **                               - u32StartAddress is not 32-byte aligned
 **                               - u32ByteSize is not an integer multiple
 **                                 of 32 (bytes)
 *****************************************************************************/
en_result_t Cpu_InvalidateDCacheArea(uint32_t u32StartAddress, uint32_t u32ByteSize)
{
    const uint32_t u32EndAddress = u32StartAddress + u32ByteSize - 1;
    
    // Check start address alignment to avoid invalidating of unwanted areas (cache lines are 32-byte aligned)
    if((u32StartAddress & 0x1f) != 0)
    {
        return ErrorInvalidParameter;
    }
    // Check that size is a multiple of the cache line size to avoid invalidating of unwanted areas
    if((u32ByteSize % 32) != 0)
    {
        return ErrorInvalidParameter;
    }
    
    for( ; u32StartAddress < u32EndAddress; u32StartAddress += 32)
    {
        // Invalidate data cache line by MVA to PoC (refer ARM Cortex-R5 TRM)
        MCR(15, 0, u32StartAddress, 7, 6, 1);    
    }

    return Ok;
} /* Cpu_InvalidateDCacheArea */


/*! @} */

//#endif /* (PDL_PERIPHERAL_CPU_ACTIVE) */

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/* EOF (not truncated)                                                       */
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