Intel 80310 I/O Processor Chipset AAU Coding Techniques

Intel ® 80310 I/O Processor Chipset AAU Coding TechniquesLow-Level Design DocumentThe Table 8 data structure describes the AAU device. It keeps track of all the variables that arerelated to the AAU.Table 8.AAU Device Descriptortypedef struct _iop310_aau_t{const char *dev_id; /* Device ID */list_t process_q; /* Processing Q */list_t holding_q; /* Holding Q */spinlock_t lock_pq; /* PQ spinlock */spinlock_t lock_hq; /* HQ spinlock */aau_regs_t *regs; /* AAU registers */int irq; /* IRQ number */sw_aau_t *last_aau; /* ptr to last AAU disc */struct tq_struct aau_task; /* AAU task entry */wait_queue_head_t wait_q; /* AAU wait queue */atomic_t ref_count; /* AAU Reference count */} iop310_aau_t;The following structures represent the data format applications use to pass data to the AAU API.The application creates a SGL header with a SGL pointed to by the header. When no callbackfunction is required, the call_back value must set to NULL. The status field should bezeroed out before being passed down. The end of the list is always marked by the next_sglvariable in the SGL list pointed to NULL.Table 9.User SGL Headerstruct _aau_sgl_head_t{u32 total; /* total SGLs */aau_sgl_t *list; /* Pointer to list head */u32 status; /* SG status */aau_callback_t callback; /* Callback func ptr */} aau_sgl_head_t;14 White Paper