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/******************************************************************************
* control_if.h
*
* Interface to server controller (e.g., 'xend'). This header file defines the
* interface that is shared with guest OSes.
*
* Copyright (c) 2004, K A Fraser
*/
#ifndef __CONTROL_IF_H__
#define __CONTROL_IF_H__
typedef struct {
u8 type; /* echoed in response */
u8 subtype; /* echoed in response */
u8 id; /* echoed in response */
u8 length; /* number of bytes in 'msg' */
unsigned char msg[60]; /* type-specific message data */
} control_msg_t;
#define CONTROL_RING_SIZE 8
typedef unsigned int CONTROL_RING_IDX;
#define MASK_CONTROL_IDX(_i) ((_i)&(CONTROL_RING_SIZE-1))
typedef struct {
control_msg_t tx_ring[CONTROL_RING_SIZE]; /* guest-OS -> controller */
control_msg_t rx_ring[CONTROL_RING_SIZE]; /* controller -> guest-OS */
CONTROL_RING_IDX tx_req_prod, tx_resp_prod;
CONTROL_RING_IDX rx_req_prod, rx_resp_prod;
} control_if_t;
#define CMSG_CONSOLE 0
#define CMSG_CONSOLE_DATA 0
#endif /* __CONTROL_IF_H__ */
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