lib_mem.c

STM3240G-Eval_uCOS-III

        return;
    }
    if (pmem == (void *)0) {
        return;
    }
#endif


    data_align = 0u;
    for (i = 0u; i < sizeof(CPU_ALIGN); i++) {                  /* Fill each data_align octet with data val.            */
        data_align <<=  DEF_OCTET_NBR_BITS;
        data_align  |= (CPU_ALIGN)data_val;
    }

    size_rem      =  size;
    mem_align_mod = (CPU_INT08U)((CPU_ADDR)pmem % sizeof(CPU_ALIGN));   /* See Note #3.                                 */

    pmem_08 = (CPU_INT08U *)pmem;
    if (mem_align_mod != 0u) {                                  /* If leading octets avail,                   ...       */
        i = mem_align_mod;
        while ((size_rem > 0) &&                                /* ... start mem buf fill with leading octets ...       */
               (i        < sizeof(CPU_ALIGN ))) {               /* ... until next CPU_ALIGN word boundary.              */
           *pmem_08++ = data_val;
            size_rem -= sizeof(CPU_INT08U);
            i++;
        }
    }

    pmem_align = (CPU_ALIGN *)pmem_08;                          /* See Note #2a.                                        */
    while (size_rem >= sizeof(CPU_ALIGN)) {                     /* While mem buf aligned on CPU_ALIGN word boundaries,  */
       *pmem_align++ = data_align;                              /* ... fill mem buf with    CPU_ALIGN-sized data.       */
        size_rem    -= sizeof(CPU_ALIGN);
    }

    pmem_08 = (CPU_INT08U *)pmem_align;
    while (size_rem > 0) {                                      /* Finish mem buf fill with trailing octets.            */
       *pmem_08++   = data_val;
        size_rem   -= sizeof(CPU_INT08U);
    }
}


/*$PAGE*/
/*
*********************************************************************************************************
*                                             Mem_Copy()
*
* Description : Copy data octets from one memory buffer to another memory buffer.
*
* Argument(s) : pdest       Pointer to destination memory buffer.
*
*               psrc        Pointer to source      memory buffer.
*
*               size        Number of octets to copy (see Note #1).
*
* Return(s)   : none.
*
* Caller(s)   : Application.
*
* Note(s)     : (1) Null copies allowed (i.e. zero-length copies).
*
*               (2) Memory buffers NOT checked for overlapping.
*
*                   (a) IEEE Std 1003.1, 2004 Edition, Section 'memcpy() : DESCRIPTION' states that "if
*                       copying takes place between objects that overlap, the behavior is undefined".
*
*                   (b) However, data octets from a source memory buffer at a higher address value SHOULD
*                       successfully copy to a destination memory buffer at a lower  address value even
*                       if any octets of the memory buffers overlap as long as no individual, atomic CPU
*                       word copy overlaps.
*
*                       Since Mem_Copy() performs the data octet copy via 'CPU_ALIGN'-sized words &/or
*                       octets; & since 'CPU_ALIGN'-sized words MUST be accessed on word-aligned addresses
*                       (see Note #3b), neither 'CPU_ALIGN'-sized words nor octets at unique addresses can
*                       ever overlap.
*
*                       Therefore, Mem_Copy() SHOULD be able to successfully copy overlapping memory
*                       buffers as long as the source memory buffer is at a higher address value than the
*                       destination memory buffer.
*
*               (3) For best CPU performance, optimized to copy data buffer using 'CPU_ALIGN'-sized data
*                   words.
*
*                   (a) Since many word-aligned processors REQUIRE that multi-octet words be accessed on
*                       word-aligned addresses, 'CPU_ALIGN'-sized words MUST be accessed on 'CPU_ALIGN'd
*                       addresses.
*
*               (4) Modulo arithmetic is used to determine whether a memory buffer starts on a 'CPU_ALIGN'
*                   address boundary.
*
*                   Modulo arithmetic in ANSI-C REQUIREs operations performed on integer values.  Thus
*                   address values MUST be cast to an appropriately-sized integer value PRIOR to any
*                  'mem_align_mod' arithmetic operation.
*********************************************************************************************************
*/
/*$PAGE*/
#if (LIB_MEM_CFG_OPTIMIZE_ASM_EN != DEF_ENABLED)
void  Mem_Copy (       void        *pdest,
                const  void        *psrc,
                       CPU_SIZE_T   size)
{
           CPU_SIZE_T    size_rem;
           CPU_SIZE_T    mem_gap_octets;
           CPU_ALIGN    *pmem_align_dest;
    const  CPU_ALIGN    *pmem_align_src;
           CPU_INT08U   *pmem_08_dest;
    const  CPU_INT08U   *pmem_08_src;
           CPU_DATA      i;
           CPU_DATA      mem_align_mod_dest;
           CPU_DATA      mem_align_mod_src;
           CPU_BOOLEAN   mem_aligned;


#if (LIB_MEM_CFG_ARG_CHK_EXT_EN == DEF_ENABLED)
    if (size < 1) {                                             /* See Note #1.                                         */
        return;
    }
    if (pdest == (void *)0) {
        return;
    }
    if (psrc  == (void *)0) {
        return;
    }
#endif


    size_rem           =  size;

    pmem_08_dest       = (      CPU_INT08U *)pdest;
    pmem_08_src        = (const CPU_INT08U *)psrc;

    mem_gap_octets     = pmem_08_src - pmem_08_dest;


    if (mem_gap_octets >= sizeof(CPU_ALIGN)) {                  /* Avoid bufs overlap.                                  */
                                                                /* See Note #4.                                         */
        mem_align_mod_dest = (CPU_INT08U)((CPU_ADDR)pmem_08_dest % sizeof(CPU_ALIGN));
        mem_align_mod_src  = (CPU_INT08U)((CPU_ADDR)pmem_08_src  % sizeof(CPU_ALIGN));

        mem_aligned        = (mem_align_mod_dest == mem_align_mod_src) ? DEF_YES : DEF_NO;

        if (mem_aligned == DEF_YES) {                           /* If mem bufs' alignment offset equal, ...             */
                                                                /* ... optimize copy for mem buf alignment.             */
            if (mem_align_mod_dest != 0u) {                     /* If leading octets avail,                   ...       */
                i = mem_align_mod_dest;
                while ((size_rem   >  0) &&                     /* ... start mem buf copy with leading octets ...       */
                       (i          <  sizeof(CPU_ALIGN ))) {    /* ... until next CPU_ALIGN word boundary.              */
                   *pmem_08_dest++ = *pmem_08_src++;
                    size_rem      -=  sizeof(CPU_INT08U);
                    i++;
                }
            }

            pmem_align_dest = (      CPU_ALIGN *)pmem_08_dest;  /* See Note #3a.                                        */
            pmem_align_src  = (const CPU_ALIGN *)pmem_08_src;
            while (size_rem      >=  sizeof(CPU_ALIGN)) {       /* While mem bufs aligned on CPU_ALIGN word boundaries, */
               *pmem_align_dest++ = *pmem_align_src++;          /* ... copy psrc to pdest with CPU_ALIGN-sized words.   */
                size_rem         -=  sizeof(CPU_ALIGN);
            }

            pmem_08_dest = (      CPU_INT08U *)pmem_align_dest;
            pmem_08_src  = (const CPU_INT08U *)pmem_align_src;
        }
    }

    while (size_rem > 0) {                                      /* For unaligned mem bufs or trailing octets, ...       */
       *pmem_08_dest++ = *pmem_08_src++;                        /* ... copy psrc to pdest by octets.                    */
        size_rem      -=  sizeof(CPU_INT08U);
    }
}
#endif


/*
*********************************************************************************************************
*                                             Mem_Move()
*
* Description : Move data octets from one memory buffer to another memory buffer, or within the same
*               memory buffer. Overlapping is correctly handled for all move operations.
*
* Argument(s) : pdest       Pointer to destination memory buffer.
*
*               psrc        Pointer to source      memory buffer.
*
*               size        Number of octets to move (see Note #1).
*
* Return(s)   : none.
*
* Caller(s)   : Application.
*
* Note(s)     : (1) Null move operations allowed (i.e. zero-length).
*
*               (2) Memory buffers checked for overlapping.
*
*               (3) For best CPU performance, optimized to copy data buffer using 'CPU_ALIGN'-sized data
*                   words.
*
*                   (a) Since many word-aligned processors REQUIRE that multi-octet words be accessed on
*                       word-aligned addresses, 'CPU_ALIGN'-sized words MUST be accessed on 'CPU_ALIGN'd
*                       addresses.
*
*               (4) Modulo arithmetic is used to determine whether a memory buffer starts on a 'CPU_ALIGN'
*                   address boundary.
*
*                   Modulo arithmetic in ANSI-C REQUIREs operations performed on integer values.  Thus
*                   address values MUST be cast to an appropriately-sized integer value PRIOR to any
*                  'mem_align_mod' arithmetic operation.
*********************************************************************************************************
*/
/*$PAGE*/

void  Mem_Move (       void        *pdest,
                const  void        *psrc,
                       CPU_SIZE_T   size)
{
           CPU_SIZE_T    size_rem;
           CPU_SIZE_T    mem_gap_octets;
           CPU_ALIGN    *pmem_align_dest;
    const  CPU_ALIGN    *pmem_align_src;
           CPU_INT08U   *pmem_08_dest;
    const  CPU_INT08U   *pmem_08_src;
           CPU_INT08S    i;
           CPU_DATA      mem_align_mod_dest;
           CPU_DATA      mem_align_mod_src;
           CPU_BOOLEAN   mem_aligned;


#if (LIB_MEM_CFG_ARG_CHK_EXT_EN == DEF_ENABLED)
    if (size < 1) {
        return;
    }
    if (pdest == (void *)0) {
        return;
    }
    if (psrc  == (void *)0) {
        return;
    }
#endif

    pmem_08_src  = (const CPU_INT08U *)psrc;
    pmem_08_dest = (      CPU_INT08U *)pdest;
    if (pmem_08_src > pmem_08_dest) {
        Mem_Copy(pdest, psrc, size);
        return;
    }

    size_rem           =  size;

    pmem_08_dest       = (      CPU_INT08U *)pdest + size - 1;
    pmem_08_src        = (const CPU_INT08U *)psrc  + size - 1;
    
    mem_gap_octets     = pmem_08_dest - pmem_08_src;
    

    if (mem_gap_octets >= sizeof(CPU_ALIGN)) {                  /* Avoid bufs overlap.                                  */
    
                                                                /* See Note #4.                                         */
        mem_align_mod_dest = (CPU_INT08U)((CPU_ADDR)pmem_08_dest % sizeof(CPU_ALIGN));
        mem_align_mod_src  = (CPU_INT08U)((CPU_ADDR)pmem_08_src  % sizeof(CPU_ALIGN));

        mem_aligned        = (mem_align_mod_dest == mem_align_mod_src) ? DEF_YES : DEF_NO;

        if (mem_aligned == DEF_YES) {                           /* If mem bufs' alignment offset equal, ...             */
                                                                /* ... optimize copy for mem buf alignment.             */
            if (mem_align_mod_dest != (sizeof(CPU_ALIGN) - 1)) {/* If leading octets avail,                   ...       */
                i = mem_align_mod_dest;
                while ((size_rem   >  0) &&                     /* ... start mem buf copy with leading octets ...       */
                       (i          >= 0)) {                     /* ... until next CPU_ALIGN word boundary.              */
                   *pmem_08_dest-- = *pmem_08_src--;
                    size_rem      -=  sizeof(CPU_INT08U);
                    i--;
                }
            }

                                                                /* See Note #3a.                                        */
            pmem_align_dest = (      CPU_ALIGN *)((CPU_INT08U *)pmem_08_dest - sizeof(CPU_ALIGN) + 1);
            pmem_align_src  = (const CPU_ALIGN *)((CPU_INT08U *)pmem_08_src  - sizeof(CPU_ALIGN) + 1);
            while (size_rem      >=  sizeof(CPU_ALIGN)) {       /* While mem bufs aligned on CPU_ALIGN word boundaries, */
               *pmem_align_dest-- = *pmem_align_src--;          /* ... copy psrc to pdest with CPU_ALIGN-sized words.   */
                size_rem         -=  sizeof(CPU_ALIGN);
            }