Uniform Driver Interface: Difference between revisions
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Explained scratch spaces |
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There are several types of control blocks, the generic block type being udi_cb_t. All other types of control blocks are supersets of the generic control block. Also, there is the notion of control block groups - control blocks are categorized into groups of control blocks of the same size. Control blocks within the same group can thus be used interchangeably using casts. |
There are several types of control blocks, the generic block type being udi_cb_t. All other types of control blocks are supersets of the generic control block. Also, there is the notion of control block groups - control blocks are categorized into groups of control blocks of the same size. Control blocks within the same group can thus be used interchangeably using casts. |
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Each control block may own a scratch space which is driver-specific and must be preserved across asynchronous and service calls. The driver can change the size for its control blocks' scratch spaces and if any of these are zero in size, their pointers must not be dereferenced. |
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==Initial state== |
==Initial state== |
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