VxWorks IO model, driver and device model

1) The VxWorks driver generally implements 7 API calls: create, open, read, write, ioctl, remove, close
2) Call iosDrvInstall to register the above 7 APIs in drvTable, and iosDrvShow can be used to display the content of the drvTable table, for example:

-> iosDrvShow
drv  creat       remove      open        close       read        write       ioctl
  0  0x0         0x0         0x30de14    0x30ded4    0x0         0x30de0c    0x30de4c  
  1  0x310f54    0x0         0x310f54    0x310fac    0x311c4c    0x311b1c    0x311000  
  2  0x0         0x0         0x30ead0    0x30ebe4    0x30ec3c    0x30ed00    0x30ee94  
  3  0x26a6b0    0x26ae1c    0x26a18c    0x26a7dc    0x26c148    0x26c188    0x26d6d0  
  4  0x36ead8    0x0         0x36ead8    0x36e070    0x36ed64    0x36efc0    0x36e6f4  
  5  0x30f5b4    0x0         0x30f5b4    0x30f608    0x30f6b8    0x30f7e0    0x30f874  
  6  0x30f564    0x0         0x30f564    0x30f65c    0x30f748    0x30f80c    0x30f958  
  7  0x0         0x0         0x0         0x385814    0x385880    0x385868    0x385898  
  8  0x390944    0x0         0x390944    0x390a30    0x311c4c    0x311b1c    0x390a88  
  9  0x38fe54    0x38fe60    0x38fc30    0x38ff7c    0x390218    0x390220    0x390228  
value = 20 = 0x14

3) Use iosDevAdd to create a new device, and add the device to iosDvList, you can use iosDevShow (devs) to display the list of devices

-> iosDevShow
drv name                
  0 /null               
  1 /tyCo/0             
  8 /vio                
  9 /tgtsvr             
  3 /sd0:1              
  4 /sd0:2              
value = 25 = 0x19

From the above two outputs, it can be seen that the driver number of the device named "/sd0:1" is 3, and the corresponding driver API function is:

3  0x26a6b0    0x26ae1c    0x26a18c    0x26a7dc    0x26c148    0x26c188    0x26d6d0  

It can be seen from the disassembly code:

0x26a6b0–>dosFsCreate
0x26ae1c–>dosFsDelete
0x26a18c–>dosFsOpen
0x26a7dc–>dosFsClose
0x26c148–>dosFsRead
0x26c188–>dosFsWrite
0x26d6d0–>dosFsIoctl

3 Establish fd table FD_ENTRY ** iosFdTable, and STATUS iosFdEntrySet(FD_ENTRY *pFdEntry,DEV_HDR *pDevHdr,const char *name, void *value)register fd to iosFdTable table with.

Summary: The drive model of vxWorks is very simple, a chain of 2 tables.