72b7abd1a1
- if an operation (R, W, IOCTL) is non blocking, a flag is set and sent to the device. - nothing changes for sync devices - asyn devices should reply asap if an operation is non-blocking. We must trust the devices, but we had to trust them anyway to reply to CANCEL correctly - we safe sending CANCEL commands to asyn devices. This greatly simplifies the protocol. Asynchronous devices can always reply when a reply is ready and do not need to deal with other situations - currently, none of our drivers use the flags since they drive virtual devices which do not block
42 lines
1.6 KiB
C
42 lines
1.6 KiB
C
#ifndef _MINIX_CHARDRIVER_H
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#define _MINIX_CHARDRIVER_H
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#include <minix/driver.h>
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/* Entry points into the device dependent code of character drivers. */
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struct chardriver {
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_PROTOTYPE( int (*cdr_open), (message *m_ptr) );
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_PROTOTYPE( int (*cdr_close), (message *m_ptr) );
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_PROTOTYPE( int (*cdr_ioctl), (message *m_ptr) );
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_PROTOTYPE( struct device *(*cdr_prepare), (dev_t device) );
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_PROTOTYPE( int (*cdr_transfer), (endpoint_t endpt, int opcode,
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u64_t position, iovec_t *iov, unsigned int nr_req,
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endpoint_t user_endpt, unsigned int flags) );
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_PROTOTYPE( void (*cdr_cleanup), (void) );
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_PROTOTYPE( void (*cdr_alarm), (message *m_ptr) );
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_PROTOTYPE( int (*cdr_cancel), (message *m_ptr) );
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_PROTOTYPE( int (*cdr_select), (message *m_ptr) );
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_PROTOTYPE( int (*cdr_other), (message *m_ptr) );
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};
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#define CHARDRIVER_SYNC 0 /* use the synchronous protocol */
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#define CHARDRIVER_ASYNC 1 /* use the asynchronous protocol */
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#define IS_CDEV_MINOR_RQ(type) (IS_DEV_RQ(type) && (type) != DEV_STATUS)
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/* Functions defined by libchardriver. */
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_PROTOTYPE( void chardriver_announce, (void) );
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_PROTOTYPE( void chardriver_process, (struct chardriver *cdp, int driver_type,
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message *m_ptr, int ipc_status) );
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_PROTOTYPE( void chardriver_terminate, (void) );
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_PROTOTYPE( void chardriver_task, (struct chardriver *cdp, int driver_type) );
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_PROTOTYPE( int do_nop, (message *m_ptr) );
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_PROTOTYPE( void nop_cleanup, (void) );
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_PROTOTYPE( void nop_alarm, (message *m_ptr) );
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_PROTOTYPE( int nop_cancel, (message *m_ptr) );
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_PROTOTYPE( int nop_select, (message *m_ptr) );
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_PROTOTYPE( int nop_ioctl, (message *m_ptr) );
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#endif /* _MINIX_CHARDRIVER_H */
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