+ void *sb_virt; /* ptr to "struct status_block_e{4,5}" */
+ u32 sb_size; /* size of "struct status_block_e{4,5}" */
+ __le16 *sb_pi_array; /* ptr to "sb_virt->pi_array" */
+ __le32 *sb_prod_index; /* ptr to "sb_virt->prod_index" */
+#define STATUS_BLOCK_PROD_INDEX_MASK 0xFFFFFF
+