ide device driver
I'm working on some diagrams in an attempt to help me understand how the
ide device driver
works. Below is a general outline that shows how I plan to organize
this diagram. I would be grateful for any advice or comments.
1) driver initialization
2) error handling
3) read operation
4) write operation
6) memory management
7) event handling
Level 2 "Expanding initialization"
1) allocate memory and establish data structures
2) establish state information and populate data elements
3) determine base port i/o address
4) irq setup
5) dma setup
6) register with VFS: establish device major number and register
7) initialize event handling
Level 3 "Error handling"
1) resource availability
2) device errors that involve: reading, writing, timing
3) runtime resourse errors
4) explicit error codes
5) overrun and under timing
Level 4 "Read"
1) recieve event
2) transfer argument to working space
3) allocate buffers "I think the buffer allocation is done by the
4) device control
5) suspend/wait processing
7) receive data
8) kernel passes data to associated process
Level 5 "Disk driver initiates read throught disk drive controller"
1) check status
2) setup dma channel
3) associate device with buffer channel
4) load device control register: dma channel, cmd, logical link
5) sync action
I'm hoping that someone will be able to look at this and provide me with
some feedback. I' trying to work on a school project that involves
adaptive block rearrangment. The problem is that I've never had any
experience with systems programming. I think the construction of such a
diagram "except this one needs to be correct" would be extremely
helpful. As I go through ide.c, I can associate each routine with one
of the above specified categories.
Scott Gray :)
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