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99 lines
4.5 KiB
Plaintext
99 lines
4.5 KiB
Plaintext
All functions are stdcall unless mentioned otherwise.
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=== Disk ===
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The kernel exports the functions 'DiskAdd', 'DiskMediaChanged', 'DiskDel' for
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drivers. They must be called in the following order: DiskAdd, then zero or
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more DiskMediaChanged, then optionally DiskDel. The driver must not call
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two functions in parallel, including two calls to DiskMediaChanged.
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void* DiskAdd(DISKFUNC* functions, const char* name, void* userdata, int flags);
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; The pointer 'functions' must be valid at least until the disk will be deleted
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; (until DISKFUNC.close is called).
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; The pointer 'name' can be invalid after this function returns.
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; It should point to ASCIIZ-string without leading '/' in latin lowercase and
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; digits, like 'usbhd0'.
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; The value 'userdata' is any pointer-sized data, passed as is to all
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; callbacks.
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DISK_NO_INSERT_NOTIFICATION = 1
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; The bitfield 'flags' has currently only one bit defined. If it is set, the
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; driver will never call DiskMediaChanged(hDisk, true), so the kernel must scan
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; for media insertion when the operation is requested.
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struc DISKFUNC
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{
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.strucsize dd ?
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.close dd ?
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; void close(void* userdata);
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; Optional.
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; The last function that is called for the given disk. The kernel calls it when
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; the kernel has finished all operations with the disk and it is safe to free
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; all driver-specific data identified by 'userdata'.
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.closemedia dd ?
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; void closemedia(void* userdata);
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; Optional.
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; The kernel calls this function when it finished all processing with the
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; current media. If media is removed, the driver should decline all requests
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; to that media with DISK_STATUS_NO_MEDIA, even if new media is inserted,
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; until this function is called. If media is removed, a new call to
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; DiskMediaChanged(hDisk, true) is not allowed until this function is called.
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.querymedia dd ?
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; int querymedia(void* userdata, DISKMEDIAINFO* info);
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; return value: 0 = success, otherwise = error
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.read dd ?
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; int read(void* userdata, void* buffer, __int64 startsector,
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; int* numsectors);
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; return value: 0 = success, otherwise = error
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.write dd ?
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; int write(void* userdata, const void* buffer, __int64 startsector,
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; int* numsectors);
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; Optional.
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; return value: 0 = success, otherwise = error
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.flush dd ?
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; int flush(void* userdata);
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; Optional.
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; Flushes the hardware cache, if it exists. Note that a driver should not
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; implement a software cache for read/write, since they are called from the
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; kernel cache manager.
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.adjust_cache_size dd ?
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; unsigned int adjust_cache_size(unsigned int suggested_size);
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; Optional.
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; Returns the cache size for this device in bytes. 0 = disable cache.
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}
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struc DISKMEDIAINFO
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{
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.flags dd ?
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DISK_MEDIA_READONLY = 1
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.sectorsize dd ?
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.capacity dq ?
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}
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void DiskDel(void* hDisk);
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; This function informs the kernel that the disk should be deleted from the
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; system. This function removes the disk from the global file system; however,
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; it is possible that active operations with the disk are still running. When
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; the disk is actually removed, the kernel calls the 'close' function, which
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; can free all device-related resources.
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void DiskMediaChanged(void* hDisk, int newstate);
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; This function informs the kernel that a media has been inserted, removed or
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; changed. 'newstate' should be zero if currently there is no media inserted
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; and nonzero in the other case. This function must not be called with nonzero
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; 'newstate' from any of callbacks. This function must not be called if another
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; call to this function is active.
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=== Timers ===
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Timers allow to schedule a function call to some time in the future, once
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or periodically. A timer function can do anything, including adding/removing
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other timers and itself, but it should not run time-consuming tasks, since that
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would block the processing thread for a long time; for such tasks it is
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recommended to create new thread.
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void* TimerHS(unsigned int deltaStart, unsigned int interval,
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void* timerFunc, void* userData);
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; Registers a timer which is activated in (deltaStart == 0 ? deltaStart :
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; interval) 1/100ths of second starting from the current time. If interval
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; is zero, this timer is automatically deleted when activated. Otherwise,
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; this timer will be activated every (interval) 1/100ths of second from the
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; first activation. Activated timer calls timerFunc(userData) as stdcall.
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; Returned value: NULL = failed, otherwise = timer handle which can be passed
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; to CancelTimerHS.
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void CancelTimerHS(void* hTimer);
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; Cancels previously registered timer.
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