BSP Developer's Guide

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VxWorks 5.5 BSP Developer’s Guide A protocol writer has to deal only with calls to the MUX. Everything device-specific is handled in the drivers of the data link layer, the layer below the MUX. Protocol Startup Each protocol that wants to receive packets must first attach itself to the MUX. To do this, the protocol calls muxBind( ). The returned function value is a “cookie” that identifies the network interface driver to which the MUX has bound the protocol. The protocol must save this cookie for use in subsequent calls to the MUX. As input to the muxBind( ), you must specify the name of a network device (for example, ln and 0, ln and 1, ei and 0, and so on), the appropriate receive, restart, and shutdown functions for the protocol, a protocol type (from RFC 1700), and a name for the attaching protocol. The MUX uses the protocol type to prioritize the protocols. This priority determines which protocol sees packets first. When a driver passes a packet up to the MUX, the driver includes a pointer to its END_OBJ structure. Included in this structure is the member, protocols, the head of the list of protocols (a list of NET_PROTOCOL structures) listening to this device. The order of the protocols in this list determines the order in which the protocols see the packet. Maintaining this list is the responsibility of the MUX. If a protocol specifies a type of MUX_PROTO_SNARF in its muxBind( ), the MUX adds the protocol to the top of the list in END_OBJ.protocols. At any given moment, the MUX allows only one active protocol of type MUX_PROTO_SNARF.If a protocol specifies a type of MUX_PROTO_PROMISC in its muxBind( ), the MUX adds the protocol to the bottom of the list in END_OBJ.protocols. If a protocol specifies any other type in its muxBind( ), the MUX adds the protocol to the list just after the MUX_PROTO_SNARF protocol (or the top of the list if there is no protocol of type MUX_PROTO_SNARF). This shuffling of protocols ensures that lower priority protocols cannot steal or damage a packet before a higher priority protocol gets to see the packet. Snarfing Protocols Block Packets to Lower Priority Protocols If the receive routine for a protocol returns TRUE, and, if the protocol is not of type MUX_PROTO_PROMISC, the MUX lets the protocol snarf the packet (that is, the MUX lets the protocol take delivery of the packet). If a protocol takes delivery of 302
H Implementing a MUX-Based Network Interface Driver the packet, the MUX does not show the packet to any of the other protocols further down on the END_OBJ.protocols list. If you want a protocol to act as a firewall, the protocol should register as type MUX_PROTO_SNARF and should return TRUE from its receive function. If you want a protocol to see all uneaten packets that show up on the device, register the protocol with type MUX_PROTO_PROMISC. Protocols and Network Addressing The system is written to support both RFC 894 type Ethernet packets as well as 802.3 encoded packets. If a protocol wants to use 802.3 style packets, it must register SAP (Service Access Point) as its protocol type. Otherwise, the protocol must use one of the accepted protocol types from RFC 1700. Output Protocols A single protocol can be bound to each device for the filtering of output packets. This functionality is provided for applications that want to look at every packet that is output on a particular device. The type MUX_PROTO_OUTPUT is passed into muxBind( ) when this protocol is registered. Only the stackRcvRtn parameter is valid with this type. Sending Data To put the appropriate address header information into the buffer, the protocol calls muxAddressForm( ). Finally, to send the packet, the protocol calls muxSend( ), passing in the cookie returned from the muxBind( ) as well as the mBlk that contains the packet it wants to send. The MUX then hands the packet to the driver. H Receiving Data In response to an interrupt from the network device, VxWorks executes the device’s previously registered interrupt service routine. This routine gets the packet off the device and queues it for processing the task level, where the driver prepares the packet for hand-off to the MUX. For a more detailed description of this process, see H.3 Guidelines for Handling Packet Reception in Your Driver, p.275. To hand the packet off to the MUX, the driver calls muxReceive( ). The muxReceive( ) routine determines the protocol type of the packet (0x800 for IP, 303
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VxWorks® 5.5 BSP DEVELOPER’S GUI
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1 Overview ........................
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Contents 1 Overview ...............
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Contents 3.6.5 Cache, MMU, and DMA
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Contents Memory-Mapped Chips ......
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Contents 7.3.3 System Configuration
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Contents 9.5.4 Processing .........
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Contents F Generic Drivers ........
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Contents Stopping the Driver Withou
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1 Overview 1.1 Introduction One str
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1 Overview ■ New Drivers Many new
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1 Overview Included with Tornado (n
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1 Overview ■ ■ ■ ■ ■ ■
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1 Overview Table 1-1 Font Usage for
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2 BSP Organization 2.1 Introduction
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2 BSP Organization Files in the tar
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2 BSP Organization Files in the tar
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2 BSP Organization Version 1.0 BSPs
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2 BSP Organization SM_MEM_SIZE The
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2 BSP Organization For boards witho
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2 BSP Organization PCI_MSTR_IO_LOCA
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2 BSP Organization The entry point
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2 BSP Organization target.nr The fi
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2 BSP Organization bootrom This fil
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2 BSP Organization sysSerialHwInit(
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2 BSP Organization The Motorola M68
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2 BSP Organization Many VxWorks fac
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2 BSP Organization further board in
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2 BSP Organization can have very un
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3 Creating a New BSP 3.1 Introducti
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3 Creating a New BSP 3.2 Setting Up
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3 Creating a New BSP Makefile At a
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3 Creating a New BSP char * sysBspR
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3 Creating a New BSP ... #endif } T
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3 Creating a New BSP int dummy; ...
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3 Creating a New BSP To find the so
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3 Creating a New BSP might want to
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3 Creating a New BSP not, use the s
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3 Creating a New BSP ■ It has a V
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3 Creating a New BSP 3.6.7 SCSI VxW
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4 Hardware Guidelines 4.1 Introduct
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4 Hardware Guidelines to the start
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4 Hardware Guidelines Higher-level
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4 Hardware Guidelines Such dedicate
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4 Hardware Guidelines Especially us
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4 Hardware Guidelines selected from
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4 Hardware Guidelines Hardware Inte
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4 Hardware Guidelines The rest of t
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4 Hardware Guidelines 4.4.2 System
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4 Hardware Guidelines only deal wit
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4 Hardware Guidelines 4.4.13 Parall
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4 Hardware Guidelines 0x10000, /* 6
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4 Hardware Guidelines The following
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5 Driver Guidelines 5.1 Introductio
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5 Driver Guidelines Maintenance and
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5 Driver Guidelines word addresses.
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5 Driver Guidelines 5.4 Design Guid
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5 Driver Guidelines Per-Device Data
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5 Driver Guidelines To fix this sit
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5 Driver Guidelines block are more
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5 Driver Guidelines 5.8 Driver Use
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5 Driver Guidelines ■ ■ Memory
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5 Driver Guidelines The level of ca
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5 Driver Guidelines cache for the d
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6 Components 6.1 Introduction Torna
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6 Components 6.2 Component Descript
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6 Components ■ User Presentation.
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6 Components Folder FOLDER_ANSI { N
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6 Components in a single project. I
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6 Components The component object i
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6 Components Parameters Parameters
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6 Components In the example, the co
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6 Components (2) comps/vxWorks/arch
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6 Components Figure 6-4 Include Com
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6 Components NOTE: INIT_BEFORE only
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6 Components The _CHILDREN property
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6 Components ! CAUTION: Do not alte
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6 Components ■ Check the Project
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7 Validation Testing 7.1 Introducti
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7 Validation Testing ■ ■ The te
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7 Validation Testing 2. The script
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7 Validation Testing Figure 7-4 Typ
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7 Validation Testing NOTE: Wind Riv
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7 Validation Testing scsi Requires
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7 Validation Testing Table 7-1 Vali
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7 Validation Testing Table 7-2 Vali
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7 Validation Testing sysProcNumGet
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7 Validation Testing The log file c
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8 Writing Portable C Code This chap
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8 Writing Portable C Code attribute
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8 Writing Portable C Code 8.1.3 Sta
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8 Writing Portable C Code 8.1.5 Oth
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8 Writing Portable C Code The last
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8 Writing Portable C Code Always sp
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8 Writing Portable C Code 8.2 Tool
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9 Documentation Guidelines 9.1 Intr
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9 Documentation Guidelines Spelling
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9 Documentation Guidelines Table 9-
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9 Documentation Guidelines Table 9-
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9 Documentation Guidelines ■ Avoi
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9 Documentation Guidelines ■ ■
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9 Documentation Guidelines INCLUDE
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9 Documentation Guidelines INTRODUC
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9 Documentation Guidelines 9.5 Gene
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9 Documentation Guidelines uppercas
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9 Documentation Guidelines The foll
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10 Product Packaging 10.1 SETUP Dev
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10 Product Packaging ... include $(
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10 Product Packaging Vendor-Supplie
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10 Product Packaging in the project
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A Upgrading a BSP for Tornado 2.0 T
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A Upgrading a BSP for Tornado 2.0 A
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A Upgrading a BSP for Tornado 2.0
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A Upgrading a BSP for Tornado 2.0 6
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B Upgrading a BSP for Tornado 2.2 T
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B Upgrading a BSP for Tornado 2.2 C
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B Upgrading a BSP for Tornado 2.2
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B Upgrading a BSP for Tornado 2.2 c
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B Upgrading a BSP for Tornado 2.2
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C Upgrading a BSP for the VxWorks N
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D VxWorks Boot Sequence Table D-1 d
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D VxWorks Boot Sequence Table D-1 V
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E Component Language E.1 Component
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E Component Language REQUIRES r1 r2
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E Component Language } // default i
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E Component Language FOLDER_WINDVIE
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E Component Language initialization
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E Component Language INCLUDE_MMU_BA
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E Component Language INCLUDE_NETWOR
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E Component Language INCLUDE_WDB_ME
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F Generic Drivers F.1 Introduction
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F Generic Drivers CONSOLE_TTY This
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I Writing a SCSI-2 Device Driver ;/
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I Writing a SCSI-2 Device Driver I.
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I Writing a SCSI-2 Device Driver Fo
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J BSP Validation Test Suite Referen
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K BSP Validation Checklists This ap
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K BSP Validation Checklists BSP Val
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K BSP Validation Checklists 7. Veri
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K BSP Validation Checklists 2. If t
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K BSP Validation Checklists Validat
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K BSP Validation Checklists Manufac
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K BSP Validation Checklists Manufac
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L Refgen NOTE: In Tornado 1.0.1 and
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L Refgen * SYNOPSIS * \cs * void xx
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L Refgen Yields output approximatel
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L Refgen EXAMPLE INCLUDES SEE ALSO
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M BSP Product Contents When you are
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M BSP Product Contents Do not inclu
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Index A abort button 82 addressing
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Index clocks see also individual cl
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Index naming conventions 95 perform
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Index INCLUDE_USR_APPL 38 INCLUDE_V
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Index network drivers 58 network in
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Index scsiCtrlLib 324 scsiDirectLib
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Index testing, validation 139-158 s
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