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======== Function 68, subfunction 29 - allocate ring memory. =========

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Parameters:

  * eax = 68 - function number

  * ebx = 29 - subfunction number

  * ecx = required size in bytes

Returned value:

  * eax = 0 - failed

  * eax = pointer to the allocated ring

Remarks:

  * The requested size must be an exact multiple of pagesize (4 Kb)

  * The function allocates memory in such a way that you can read and

    write beyond the size of the allocated memory and will reach the 

    beginning of the buffer again.

---------------------- Constants for registers: ----------------------

  eax - SF_SYS_MISC (68)

  ebx - SSF_MEM_ALLOC_RING (29)