NAME
        AllocAbs -- allocate at a given location

   SYNOPSIS
        memoryBlock = AllocAbs(byteSize, location)
        D0                     D0        A1

        void *AllocAbs(ULONG, APTR);

   FUNCTION
        This function attempts to allocate memory at a given absolute
        memory location.  Often this is used by boot-surviving entities
        such as recoverable ram-disks.  If the memory is already being
        used, or if there is not enough memory to satisfy the request,
        AllocAbs will return NULL.

        This block may not be exactly the same as the requested block
        because of rounding, but if the return value is non-zero, the block
        is guaranteed to contain the requested range.

   INPUTS
        byteSize - the size of the desired block in bytes
                   This number is rounded up to the next larger
                   block size for the actual allocation.
        location - the address where the memory MUST be.


   RESULT
        memoryBlock - a pointer to the newly allocated memory block, or
                      NULL if failed.

   NOTE
        If the free list is corrupt, the system will panic with alert
        AN_MemCorrupt, $01000005.

        The 8 bytes past the end of an AllocAbs will be changed by Exec
        relinking the next block of memory.  Generally you can't trust
        the first 8 bytes of anything you AllocAbs.

   SEE ALSO
        allocmem(), freemem()