Required Methods

The hierarchical device package code must implement the open, close, reset, and selftest methods, as well as the following:

---

decode-unit( adr len -- low high )

Convert adr len, a text string representation, to low high, a numerical representation of a physical address within the address space defined by this package.

---

dma-alloc( size -- virt )

Allocate a virtual address range of length size bytes that is suitable for direct memory access by a bus master device. The memory is allocated according to the most stringent alignment requirements for the bus. virt is an 32-bit address that the OpenBoot-based system can use to access the memory.

Note that dma-map-in must also be called to generate a suitable DMA address.

A child of a hierachical device calls dma-alloc using

" dma-alloc" $call-parent

For example:

-1 value my-reg : my-dma-alloc ( size -- ) " dma-alloc" $call-parent is my-reg ;

---

dma-free( virt size -- )

Free size bytes of memory previously allocated by dma-alloc at the virtual address virt.

A child of a hierachical device calls dma-free by using

" dma-free" $call-parent

For example:

2000 value my-size : my-dma-free ( -- ) my-reg my-size " dma-free" $call-parent -1 is my-reg ;

---

dma-map-in( virt size cacheable? -- devaddr )

Convert the virtual address range virt size, previously allocated by dma-alloc, into an address devaddr suitable for DMA on the bus. dma-map-in can also be used to map application-supplied data buffers for DMA use if the bus allows. If cacheable? is true, the calling child desires to use any available fast caches for the DMA buffer. If access to the buffer is required before the buffer is mapped out, the child must call dma-sync or dma-map-out to ensure cache coherency with memory.

A child of a hierachical device calls dma-map-in using

" dma-map-in" $call-parent

For example:

: my-reg-dma-map ( -- ) my-reg my-size false " dma-map-in" $call-parent ( devaddr ) is my-reg-dma ;

---

dma-map-out( virt devaddr size -- )

Remove the DMA mapping previously created with dma-map-in. Flush all caches associated with the mapping.

A child of a hierachical device calls dma-map-in by using

" dma-map-out" $call-parent

For example:

$call-parent : my-reg-dma-free ( -- ) my-reg my-reg-dma my-size " dma-map-out" $call-parent -1 is my-reg-dma ;

---

dma-sync( virt devaddr size -- )

Synchronize (flush) any memory caches associated with the DMA mapping previously established by dma-map-in. You must interleave calls to this method (or dma-map-out) between DMA and CPU accesses to the memory region, or errors may result.

For example, a child of a hierachical device calls dma-sync by using $call-parent. This method is valid for FCode version 2.1 or later. Some early version 2 systems do not define this method in the /sbus node. Those systems automatically synchronize DMA and CPU access. The following example will give correct results in all cases.

: my-dma-sync ( virt devadr size -- ) " dma-sync" ['] $call-parent catch if \ Parent does not have dma-sync \ cleanup the stack and return 2drop 3drop then ;

---

probe-self( arg-adr arg-len reg-adr reg-len fcode-adr fcode-len -- )

Probe for a child of this node. fcode-adr fcode-len is a unit-address text string that locates the FCode program for the child. reg-adr reg-len is a unit-address text string that identifies the address of the child itself. arg-adr arg-len is a string for any device arguments for the child. probe-self checks whether there is indeed FCode at the indicated location, perhaps using cpeek.

If the FCode exists, probe-self creates a new child device node and interprets the FCode. If the interpretation of the FCode fails in some way, the new device node may be empty, containing no properties or methods.

For example, to probe FCode for SBus slot #1:

" /sbus" select-dev 0 0 " 1,0" 2dup probe-self unselect-dev

---

map-in( low high size -- virt )

Create a mapping associating the range of physical addresses beginning at low high, extending for size bytes, within the package's physical address space, with a processor virtual address virt.

For example, a child of a hierachical device calls map-in with " map-in" $call-parent :

: map-reg ( -- ) my-address xx-offset + my-space xx-size ( adr space size ) " map-in" $call-parent ( virt ) is xx-reg ( ) ;

---

map-out( virt size -- )

Destroy the mapping set by map-in at virtual address virt of length size bytes.

For example, a child of a hierachical device calls map-out with " map-out" $call-parent :

: unmap-reg ( virt -- ) xx-reg xx-size ( virt size ) " map-out" $call-parent ( ) -1 is xx-reg ;

SBus Addressing

The SBus uses geographical addressing with numbered slots.

An SBus physical address is represented numerically by the SBus slot number as the high number and the offset from the base of that slot as the low number. The text string representation is slot#, offset, where both slot# and offset are the ASCII representations of hexadecimal numbers.

SBus Required Properties

Table 8-1

Property Name	Sample Value
name	"SUNW,finagle"
burst-sizes

Table 8-1

Property Name	Sample Value
device-type	" sbus"
ranges
slot-address-bits

VMEBus Addressing

VMEBus has a number of distinct address spaces represented by a subset of the 64 possible values encoded by the six "address modifier" bits. The maximum size of one of these address spaces is 32 bits. An additional bit is used to select between 16-bit and 32-bit data.

A VMEBus physical address is represented numerically as follows. The high number is made up of the six address modifier bits AM0-5 in bits 0-5 and the data width bit (0 = 16-bit data, 1 = 32-bit data) in bit 6. The low number is the offset within the selected address space. The text string representation is as,offset, where both as and offset are ASCII representations of a hexadecimal numbers; as encodes the data width and address modifier bits.

VMEBus Required Properties

Table 8-2

Property Name	Sample Value
name	"SUNW,vizzy"
device-type	" vmebus"
ranges

Device Driver Examples

The following examples of a hierarchical FCode driver are based on Sun's SBus expansion hardware called "XBox". XBox increases the number of SBus slots available in a system by providing a bus-bridge between the platform's onboard SBus and an SBus in the XBox hardware. XBox includes an SBus card called the XAdaptor card which plugs into the host platform's SBus and

includes an expansion chassis called the XBox Expansion Box. Therefore XBox is an example of a hierarchical device which, in fact, implements an SBus interface to child plug-in devices.

The example is divided into three parts: the basic device driver, the extended device driver, and the complete device driver. In the case of a hierarchical device, in practice, one would only want to develop and ship a driver with the complete functionality. Otherwise, plug-in cards which rely on a full set of parent services generally would not be able to function. The three stage presentation of the driver simply shows how a driver might grow through the development cycle.

Basic Hierarchical Device Driver

The basic driver simply declares most of the important properties of the device, particularly the addresses of the various registers. A driver in this state might be used to support the develoment of the OS driver which would attach to the device name and configure itself based on the device properties published by the FCode driver.

hex fcode-version2 " SUNW,xbox" name " 501-1840" model \ XBox Registers \ XAdaptor card registers h# 0 constant write0-offset h# 4 constant /write0 h# 2.0000 constant xac-err-offset h# c constant /xac-err h# 10.0000 constant xac-ctl0-offset h# 4 constant /xac-ctl0 h# 11.0000 constant xac-ctl1-offset h# 4 constant /xac-ctl1 h# 12.0000 constant xac-elua-offset h# 4 constant /xac-elua h# 13.0000 constant xac-ella-offset h# 4 constant /xac-ella h# 14.0000 constant xac-ele-offset h# 4 constant /xac-ele \ XBox Exapnsion box registers h# 42.0000 constant xbc-err-offset h# c constant /xbc-err h# 50.0000 constant xbc-ctl0-offset h# 4 constant /xbc-ctl0 h# 51.0000 constant xbc-ctl1-offset h# 4 constant /xbc-ctl1 h# 52.0000 constant xbc-elua-offset h# 4 constant /xbc-elua h# 53.0000 constant xbc-ella-offset h# 4 constant /xbc-ella

h# 54.0000 constant xbc-ele-offset h# 4 constant /xbc-ele : >reg-spec ( offset size -- xdrreg ) >r my-address + my-space xdrphys r> xdrint xdr+ ; write0-offset /write0 >reg-spec xac-err-offset /xac-err >reg-spec xdr+ xac-ctl0-offset /xac-ctl0 >reg-spec xdr+ xac-ctl1-offset /xac-ctl1 >reg-spec xdr+ xac-elua-offset /xac-elua >reg-spec xdr+ xac-ella-offset /xac-ella >reg-spec xdr+ xac-ele-offset /xac-ele >reg-spec xdr+ xbc-err-offset /xbc-err >reg-spec xdr+ xbc-ctl0-offset /xbc-ctl0 >reg-spec xdr+ xbc-ctl1-offset /xbc-ctl1 >reg-spec xdr+ xbc-elua-offset /xbc-elua >reg-spec xdr+ xbc-ella-offset /xbc-ella >reg-spec xdr+ xbc-ele-offset /xbc-ele >reg-spec xdr+ " reg" attribute \ Xbox can interrupt on any SBus level 1 xdrint 2 xdrint xdr+ 3 xdrint xdr+ 4 xdrint xdr+ 5 xdrint xdr+ 6 xdrint xdr+ 7 xdrint xdr+ " interrupts" attribute 1 sbus-intr>cpu xdrint 0 xdrint xdr+ 2 sbus-intr>cpu xdrint xdr+ 0 xdrint xdr+ 3 sbus-intr>cpu xdrint xdr+ 0 xdrint xdr+ 4 sbus-intr>cpu xdrint xdr+ 0 xdrint xdr+ 5 sbus-intr>cpu xdrint xdr+ 0 xdrint xdr+ 6 sbus-intr>cpu xdrint xdr+ 0 xdrint xdr+ 7 sbus-intr>cpu xdrint xdr+ 0 xdrint xdr+ " intr" attribute \ XBox bus clock speed d# 25.000.000 xdrint " clock-frequency" attribute \ Burst sizes 64,32,16,8,4,2,1 bursts. h# 7f xdrint " burst-sizes" attribute \ XBox has no slave-only slots 0 xdrint " slave-only" attribute

\ Get the number of address bits for this SBus slot from the parent SBus \ node without inheritance . OpenBoot 2.5 doesn't publish slot-address-bits. \ However 2.5 is only on 4m machines, which are all 28 bits per slot. : $= ( addr1 len1 addr2 len2 -- equal? ) \ string compare rot over - if drop 2drop false \ different lengths else comp 0= then ; : 4mhack ( -- n ) " compatible" get-inherited-attribute if d# 25 \ no "compatible" prop; assume 4c else xdrtostring " sun4m" $= if d# 28 else d# 25 \ not sun4m then nip nip then ; : #bits ( -- n ) " slot-address-bits" my-parent ihandle>phandle get-package-attribute if 4mhack else xdrtoint nip nip then ; #bits constant host-slot-size host-slot-size xdrint " slot-address-bits" attribute end0

Extended Hierarchical Device Driver

The extended driver adds methods allowing access to various device registers in addtion to the functions of the basic driver. It provides methods to:

• map in the registers
• fetch from and store to the registers
• program one of the registers which control the allocation of address space across the various SBus slots.

Such an extended driver provides methods that a developer can use to read and write registers and verify correct hardware responses. Note that the complete driver does not use all of the device registers; read/write access methods were included for all of them to allow easy testing during development.

\ extended hierarchical device driver sample hex fcode-version2 " SUNW,xbox" name " 501-1840" model \ XBox Registers h# 0 constant write0-offset h# 4 constant /write0 h# 2.0000 constant xac-err-offset h# c constant /xac-err h# 10.0000 constant xac-ctl0-offset h# 4 constant /xac-ctl0 h# 11.0000 constant xac-ctl1-offset h# 4 constant /xac-ctl1 h# 12.0000 constant xac-elua-offset h# 4 constant /xac-elua h# 13.0000 constant xac-ella-offset h# 4 constant /xac-ella h# 14.0000 constant xac-ele-offset h# 4 constant /xac-ele h# 42.0000 constant xbc-err-offset h# c constant /xbc-err h# 50.0000 constant xbc-ctl0-offset h# 4 constant /xbc-ctl0 h# 51.0000 constant xbc-ctl1-offset h# 4 constant /xbc-ctl1 h# 52.0000 constant xbc-elua-offset h# 4 constant /xbc-elua h# 53.0000 constant xbc-ella-offset h# 4 constant /xbc-ella h# 54.0000 constant xbc-ele-offset h# 4 constant /xbc-ele : >reg-spec ( offset size -- xdrreg ) >r my-address + my-space xdrphys r> xdrint xdr+ ;

\ extended hierarchical device driver sample write0-offset /write0 >reg-spec xac-err-offset /xac-err >reg-spec xdr+ xac-ctl0-offset /xac-ctl0 >reg-spec xdr+ xac-ctl1-offset /xac-ctl1 >reg-spec xdr+ xac-elua-offset /xac-elua >reg-spec xdr+ xac-ella-offset /xac-ella >reg-spec xdr+ xac-ele-offset /xac-ele >reg-spec xdr+ xbc-err-offset /xbc-err >reg-spec xdr+ xbc-ctl0-offset /xbc-ctl0 >reg-spec xdr+ xbc-ctl1-offset /xbc-ctl1 >reg-spec xdr+ xbc-elua-offset /xbc-elua >reg-spec xdr+ xbc-ella-offset /xbc-ella >reg-spec xdr+ xbc-ele-offset /xbc-ele >reg-spec xdr+ " reg" attribute \ Xbox can interrupt on any SBus level 1 xdrint 2 xdrint xdr+ 3 xdrint xdr+ 4 xdrint xdr+ 5 xdrint xdr+ 6 xdrint xdr+ 7 xdrint xdr+ " interrupts" attribute 1 sbus-intr>cpu xdrint 0 xdrint xdr+ 2 sbus-intr>cpu xdrint xdr+ 0 xdrint xdr+ 3 sbus-intr>cpu xdrint xdr+ 0 xdrint xdr+ 4 sbus-intr>cpu xdrint xdr+ 0 xdrint xdr+ 5 sbus-intr>cpu xdrint xdr+ 0 xdrint xdr+ 6 sbus-intr>cpu xdrint xdr+ 0 xdrint xdr+ 7 sbus-intr>cpu xdrint xdr+ 0 xdrint xdr+ " intr" attribute \ XBox bus clock speed d# 25.000.000 xdrint " clock-frequency" attribute \ Burst sizes 64,32,16,8,4,2,1 bursts. h# 7f xdrint " burst-sizes" attribute \ XBox has no slave-only slots 0 xdrint " slave-only" attribute \ Get the number of address bits for this SBus slot from the parent SBus \ node without inheritance . OpenBoot 2.5 doesn't publish slot-address-bits. \ However 2.5 is only on 4m machines, which are all 28 bits per slot. : $= ( addr1 len1 addr2 len2 -- equal? ) \ string compare

\ extended hierarchical device driver sample rot over - if drop 2drop false \ different lengths else comp 0= then ; : 4mhack ( -- n ) " compatible" get-inherited-attribute if d# 25 \ no "compatible" prop; assume 4c else xdrtostring " sun4m" $= if d# 28 else d# 25 \ not sun4m then nip nip then ; : #bits ( -- n ) " slot-address-bits" my-parent ihandle>phandle get-package-attribute if 4mhack else xdrtoint nip nip then ; #bits constant host-slot-size host-slot-size xdrint " slot-address-bits" attribute \ Utility display string : .me ( -- ) ." SBus " my-space .d ." XBox " ; \ The XBox device has two modes opaque and transparent. \ Upon reset the device is set to opaque mode. In this mode all \ accesses to address space of the device are directed to the XBox H/W \ (ie. XAdaptor Card or the XBox Expansion Box) itself. \ In the transparent mode all accesses are mapped to the SBus cards \ which are plugged into the XBox. In transparent mode the XBox H/W is \ accessible only via the "write-0" register. To allow another bus \ bridge to be plugged into the XBox all writes to the write-0 register \ must contain a "key" which is programmed into the XBox H/W at boot \ time. If the key field of a write to write-0 matches that programmed \ at boot time the H/W intercepts the write. Otherwise the H/W passes

\ extended hierarchical device driver sample \ the write along. \ The XBox has two sets of registers. Those of the XAdaptor card and \ and those of the XBox Expansion Box. \ Opaque mode host adapter registers -1 value xac-err-regs -1 value xac-ctl0 -1 value xac-ctl1 -1 value xac-elua -1 value xac-ella -1 value xac-ele \ Opaque mode expansion box registers -1 value xbc-err-regs -1 value xbc-ctl0 -1 value xbc-ctl1 -1 value xbc-elua -1 value xbc-ella -1 value xbc-ele \ Transparent mode register -1 value write0-reg : xbox-map-in ( offset space size -- virt ) " map-in" $call-parent ; : xbox-map-out ( virt size -- ) " map-out" $call-parent ; : map-regs ( -- ) write0-offset my-address + my-space /write0 xbox-map-in is write0-reg xac-err-offset my-address + my-space /xac-err xbox-map-in is xac-err-regs xac-ctl0-offset my-address + my-space /xac-ctl0 xbox-map-in is xac-ctl0 xac-ctl1-offset my-address + my-space /xac-ctl1 xbox-map-in is xac-ctl1 xac-elua-offset my-address + my-space /xac-elua xbox-map-in is xac-elua xac-ella-offset my-address + my-space /xac-ella xbox-map-in is xac-ella xac-ele-offset my-address + my-space /xac-ele xbox-map-in is xac-ele xbc-err-offset my-address + my-space /xbc-err xbox-map-in is xbc-err-regs xbc-ctl0-offset my-address + my-space /xbc-ctl0 xbox-map-in is xbc-ctl0 xbc-ctl1-offset my-address + my-space /xbc-ctl1 xbox-map-in is xbc-ctl1 xbc-elua-offset my-address + my-space /xbc-elua xbox-map-in is xbc-elua xbc-ella-offset my-address + my-space /xbc-ella xbox-map-in is xbc-ella xbc-ele-offset my-address + my-space /xbc-ele xbox-map-in is xbc-ele ; : unmap-regs ( -- ) write0-reg /write0 xbox-map-out -1 is write0-reg xac-err-regs /xac-err xbox-map-out -1 is xac-err-regs xac-ctl0 /xac-ctl0 xbox-map-out -1 is xac-ctl0 xac-ctl1 /xac-ctl1 xbox-map-out -1 is xac-ctl1 xac-elua /xac-elua xbox-map-out -1 is xac-elua xac-ella /xac-ella xbox-map-out -1 is xac-ella xac-ele /xac-ele xbox-map-out -1 is xac-ele xbc-err-regs /xbc-err xbox-map-out -1 is xbc-err-regs

\ extended hierarchical device driver sample xbc-ctl0 /xbc-ctl0 xbox-map-out -1 is xbc-ctl0 xbc-ctl1 /xbc-ctl1 xbox-map-out -1 is xbc-ctl1 xbc-elua /xbc-elua xbox-map-out -1 is xbc-elua xbc-ella /xbc-ella xbox-map-out -1 is xbc-ella xbc-ele /xbc-ele xbox-map-out -1 is xbc-ele ; \ Opaque mode register access words : xac-errd@ ( -- l ) xac-err-regs rl@ ; : xac-erra@ ( -- l ) xac-err-regs 4 + rl@ ; : xac-errs@ ( -- l ) xac-err-regs 8 + rl@ ; : xac-ctl0@ ( -- w ) xac-ctl0 rl@ ; : xac-ctl0! ( w -- ) xac-ctl0 rl! ; : xac-ctl1@ ( -- w ) xac-ctl1 rl@ ; : xac-ctl1! ( w -- ) xac-ctl1 rl! ; : xac-elua@ ( -- l ) xac-elua rl@ ; : xac-elua! ( l -- ) xac-elua rl! ; : xac-ella@ ( -- w ) xac-ella rl@ ; : xac-ella! ( w -- ) xac-ella rl! ; : xbc-errd@ ( -- l ) xbc-err-regs rl@ ; : xbc-erra@ ( -- l ) xbc-err-regs 4 + rl@ ; : xbc-errs@ ( -- l ) xbc-err-regs 8 + rl@ ; : xbc-ctl0@ ( -- w ) xbc-ctl0 rl@ ; : xbc-ctl0! ( w -- ) xbc-ctl0 rl! ; : xbc-ctl1@ ( -- w ) xbc-ctl1 rl@ ; : xbc-ctl1! ( w -- ) xbc-ctl1 rl! ; : xbc-elua@ ( -- l ) xbc-elua rl@ ; : xbc-elua! ( l -- ) xbc-elua rl! ; : xbc-ella@ ( -- w ) xbc-ella rl@ ; : xbc-ella! ( w -- ) xbc-ella rl! ; \ Transparent Mode register access words external : unique-key ( -- n ) " unique-key" $call-parent ; headers unique-key constant my-key my-key xdrint " write0-key" attribute : xbox! ( w offset -- ) my-key h# 18 << or or write0-reg rl! ; : write-xac-ctl0 ( w -- ) xac-ctl0-offset xbox! ;

\ extended hierarchical device driver sample : write-xac-ctl1 ( w -- ) xac-ctl1-offset xbox! ; : write-xbc-ctl0 ( w -- ) xbc-ctl0-offset xbox! ; : write-xbc-ctl1 ( w -- ) xbc-ctl1-offset xbox! ; \ Some functionally oriented words : set-key ( -- ) my-key 8 << xac-ctl0! ; : transparent ( -- ) 1 xac-ctl1! ; : opaque ( -- ) 0 write-xac-ctl1 ; : enable-slaves ( -- ) h# 38 write-xbc-ctl1 ; : xbox-errors ( -- xbc-err xac-err ) opaque xbc-errd@ xac-errd@ transparent ; : ?.errors ( xbc-err xac-err -- ) dup h# 8000.0000 and if cr .me ." xac-error " .h cr else drop then dup h# 8000.0000 and if cr .me ." xbc-error " .h cr else drop then ; \ The address space of the XBox in transparent mode may be dynamically \ allocated across its plug-in slots. This is called the \ upper-address-decode-map (uadm). Below is a table which relates the \ slot configuration code which is programmed in hardware to the \ allocation of address space for each slot. The number in each cell is \ the number of address bits needed for the slot. decimal create slot-sizes-array \ slot0 slot1 slot2 slot3 slot-config 23 c, 23 c, 23 c, 23 c, \ 00 23 c, 23 c, 23 c, 23 c, \ 01 23 c, 23 c, 23 c, 23 c, \ 02 23 c, 23 c, 23 c, 23 c, \ 03 25 c, 0 c, 0 c, 0 c, \ 04 0 c, 25 c, 0 c, 0 c, \ 05 0 c, 0 c, 25 c, 0 c, \ 06 0 c, 0 c, 0 c, 25 c, \ 07

\ extended hierarchical device driver sample 24 c, 24 c, 0 c, 0 c, \ 08 24 c, 0 c, 24 c, 0 c, \ 09 0 c, 24 c, 24 c, 0 c, \ 0a 0 c, 0 c, 0 c, 0 c, \ 0b 24 c, 23 c, 23 c, 0 c, \ 0c 23 c, 24 c, 23 c, 0 c, \ 0d \ Overridden in code 23 c, 23 c, 24 c, 0 c, \ 0e \ Overridden in code 25 c, 0 c, 0 c, 0 c, \ 0f 26 c, 26 c, 26 c, 26 c, \ 10 26 c, 26 c, 26 c, 26 c, \ 11 26 c, 26 c, 26 c, 26 c, \ 12 26 c, 26 c, 26 c, 26 c, \ 13 28 c, 0 c, 0 c, 0 c, \ 14 0 c, 28 c, 0 c, 0 c, \ 15 0 c, 0 c, 28 c, 0 c, \ 16 0 c, 0 c, 0 c, 28 c, \ 17 28 c, 28 c, 28 c, 28 c, \ 18 28 c, 28 c, 28 c, 28 c, \ 19 28 c, 28 c, 28 c, 28 c, \ 1a 28 c, 28 c, 28 c, 28 c, \ 1b 0 c, 0 c, 0 c, 0 c, \ 1c 0 c, 0 c, 0 c, 0 c, \ 1d 0 c, 0 c, 0 c, 0 c, \ 1e 0 c, 0 c, 0 c, 0 c, \ 1f hex 20 constant /slot-sizes-array -1 value slot-config : >slot-size ( slot# -- size ) slot-sizes-array slot-config la+ swap ca+ c@ 1 swap << 1 not and \ Could have slot size of 0. ; \ This array is to be filled with offsets for each slot. \ Eg. 0, 100.0000, 180.0000, 200.0000 create host-offsets 0 , 0 , 0 , 0 , : >host-offset ( child-slot# -- adr ) host-offsets swap na+ @ ; create config-d-offsets h# 100.0000 , 0 , h# 180.0000 , 0 , create config-e-offsets h# 100.0000 , h# 180.0000 , 0 , 0 , : set-host-offsets ( -- )

\ extended hierarchical device driver sample slot-config case h# d of config-d-offsets host-offsets 4 /n* move exit endof h# e of config-e-offsets host-offsets 4 /n* move exit endof endcase 0 ( initial-offset ) 4 0 do ( offset ) dup host-offsets i na+ ! ( offset ) i >slot-size + ( offset' ) loop ( final-offset ) drop ; : set-configuration ( config-code -- ) is slot-config set-host-offsets slot-config 3 << my-key 8 << or dup write-xac-ctl0 \ set XAC write-xbc-ctl0 \ set XBC slot-config xdrint " uadm" attribute \ publish slot configuration ; end0

Complete Hierarchical Device Driver

The complete driver includes all the required device node methods. It also includes code to initalize the hardware at system reset. In particular, it configures the allocation of address space across slots. It does this by either performing an autoconfiguration or by accepting a manual override via a property in its parent. During the configuration process, the driver interprets the FCode of any SBus card plugged into the XBox. This results in devices being added to the device tree.

\ complete hierarchical device driver sample hex fcode-version2 " SUNW,xbox" name " 501-1840" model " sbus" device-type \ XBox Registers h# 0 constant write0-offset h# 4 constant /write0 h# 2.0000 constant xac-err-offset h# c constant /xac-err h# 10.0000 constant xac-ctl0-offset h# 4 constant /xac-ctl0 h# 11.0000 constant xac-ctl1-offset h# 4 constant /xac-ctl1 h# 12.0000 constant xac-elua-offset h# 4 constant /xac-elua h# 13.0000 constant xac-ella-offset h# 4 constant /xac-ella h# 14.0000 constant xac-ele-offset h# 4 constant /xac-ele h# 42.0000 constant xbc-err-offset h# c constant /xbc-err h# 50.0000 constant xbc-ctl0-offset h# 4 constant /xbc-ctl0 h# 51.0000 constant xbc-ctl1-offset h# 4 constant /xbc-ctl1 h# 52.0000 constant xbc-elua-offset h# 4 constant /xbc-elua h# 53.0000 constant xbc-ella-offset h# 4 constant /xbc-ella h# 54.0000 constant xbc-ele-offset h# 4 constant /xbc-ele : >reg-spec ( offset size -- xdrreg ) >r my-address + my-space xdrphys r> xdrint xdr+ ; write0-offset /write0 >reg-spec xac-err-offset /xac-err >reg-spec xdr+ xac-ctl0-offset /xac-ctl0 >reg-spec xdr+ xac-ctl1-offset /xac-ctl1 >reg-spec xdr+ xac-elua-offset /xac-elua >reg-spec xdr+

\ complete hierarchical device driver sample xac-ella-offset /xac-ella >reg-spec xdr+ xac-ele-offset /xac-ele >reg-spec xdr+ xbc-err-offset /xbc-err >reg-spec xdr+ xbc-ctl0-offset /xbc-ctl0 >reg-spec xdr+ xbc-ctl1-offset /xbc-ctl1 >reg-spec xdr+ xbc-elua-offset /xbc-elua >reg-spec xdr+ xbc-ella-offset /xbc-ella >reg-spec xdr+ xbc-ele-offset /xbc-ele >reg-spec xdr+ " reg" attribute \ Xbox can interrupt on any SBus level 1 xdrint 2 xdrint xdr+ 3 xdrint xdr+ 4 xdrint xdr+ 5 xdrint xdr+ 6 xdrint xdr+ 7 xdrint xdr+ " interrupts" attribute 1 sbus-intr>cpu xdrint 0 xdrint xdr+ 2 sbus-intr>cpu xdrint xdr+ 0 xdrint xdr+ 3 sbus-intr>cpu xdrint xdr+ 0 xdrint xdr+ 4 sbus-intr>cpu xdrint xdr+ 0 xdrint xdr+ 5 sbus-intr>cpu xdrint xdr+ 0 xdrint xdr+ 6 sbus-intr>cpu xdrint xdr+ 0 xdrint xdr+ 7 sbus-intr>cpu xdrint xdr+ 0 xdrint xdr+ " intr" attribute \ XBox bus clock speed d# 25.000.000 xdrint " clock-frequency" attribute \ Burst sizes 64,32,16,8,4,2,1 bursts. h# 7f xdrint " burst-sizes" attribute \ XBox has no slave-only slots 0 xdrint " slave-only" attribute \ Get the number of address bits for this SBus slot from the parent SBus \ node without inheritance . OpenBoot 2.5 doesn't publish slot-address-bits. \ However 2.5 is only on 4m machines, which are all 28 bits per slot. : $= ( addr1 len1 addr2 len2 -- equal? ) \ string compare rot over - if drop 2drop false \ different lengths else comp 0= then ;

\ complete hierarchical device driver sample : 4mhack ( -- n ) " compatible" get-inherited-attribute if d# 25 \ no "compatible" prop; assume 4c else xdrtostring " sun4m" $= if d# 28 else d# 25 \ not sun4m then nip nip then ; : #bits ( -- n ) " slot-address-bits" my-parent ihandle>phandle get-package-attribute if 4mhack else xdrtoint nip nip then ; #bits constant host-slot-size host-slot-size xdrint " slot-address-bits" attribute \ Utility display string : .me ( -- ) ." SBus " my-space .d ." XBox " ; \ The XBox device has two modes opaque and transparent. \ Upon reset the device is set to opaque mode. In this mode all \ accesses to address space of the device are directed to the XBox H/W \ (ie. XAdaptor Card or the XBox Expansion Box) itself. \ In the transparent mode all accesses are mapped to the SBus cards \ which are plugged into the XBox. In transparent mode the XBox H/W is \ accessible only via the "write-0" register. To allow another bus \ bridge to be plugged into the XBox all writes to the write-0 register \ must contain a "key" which is programmed into the XBox H/W at boot \ time. If the key field of a write to write-0 matches that programmed \ at boot time the H/W intercepts the write. Otherwise the H/W passes \ the write along. \ The XBox has two sets of registers. Those of the XAdaptor card and \ and those of the XBox Expansion Box.

\ complete hierarchical device driver sample \ Opaque mode host adapter registers -1 value xac-err-regs -1 value xac-ctl0 -1 value xac-ctl1 -1 value xac-elua -1 value xac-ella -1 value xac-ele \ Opaque mode expansion box registers -1 value xbc-err-regs -1 value xbc-ctl0 -1 value xbc-ctl1 -1 value xbc-elua -1 value xbc-ella -1 value xbc-ele \ Transparent mode register -1 value write0-reg : xbox-map-in ( offset space size -- virt ) " map-in" $call-parent ; : xbox-map-out ( virt size -- ) " map-out" $call-parent ; : map-regs ( -- ) write0-offset my-address + my-space /write0 xbox-map-in is write0-reg xac-err-offset my-address + my-space /xac-err xbox-map-in is xac-err-regs xac-ctl0-offset my-address + my-space /xac-ctl0 xbox-map-in is xac-ctl0 xac-ctl1-offset my-address + my-space /xac-ctl1 xbox-map-in is xac-ctl1 xac-elua-offset my-address + my-space /xac-elua xbox-map-in is xac-elua xac-ella-offset my-address + my-space /xac-ella xbox-map-in is xac-ella xac-ele-offset my-address + my-space /xac-ele xbox-map-in is xac-ele xbc-err-offset my-address + my-space /xbc-err xbox-map-in is xbc-err-regs xbc-ctl0-offset my-address + my-space /xbc-ctl0 xbox-map-in is xbc-ctl0 xbc-ctl1-offset my-address + my-space /xbc-ctl1 xbox-map-in is xbc-ctl1 xbc-elua-offset my-address + my-space /xbc-elua xbox-map-in is xbc-elua xbc-ella-offset my-address + my-space /xbc-ella xbox-map-in is xbc-ella xbc-ele-offset my-address + my-space /xbc-ele xbox-map-in is xbc-ele ; : unmap-regs ( -- ) write0-reg /write0 xbox-map-out -1 is write0-reg xac-err-regs /xac-err xbox-map-out -1 is xac-err-regs xac-ctl0 /xac-ctl0 xbox-map-out -1 is xac-ctl0 xac-ctl1 /xac-ctl1 xbox-map-out -1 is xac-ctl1 xac-elua /xac-elua xbox-map-out -1 is xac-elua xac-ella /xac-ella xbox-map-out -1 is xac-ella xac-ele /xac-ele xbox-map-out -1 is xac-ele xbc-err-regs /xbc-err xbox-map-out -1 is xbc-err-regs xbc-ctl0 /xbc-ctl0 xbox-map-out -1 is xbc-ctl0 xbc-ctl1 /xbc-ctl1 xbox-map-out -1 is xbc-ctl1 xbc-elua /xbc-elua xbox-map-out -1 is xbc-elua xbc-ella /xbc-ella xbox-map-out -1 is xbc-ella xbc-ele /xbc-ele xbox-map-out -1 is xbc-ele

\ complete hierarchical device driver sample ; \ Opaque mode register access words : xac-errd@ ( -- l ) xac-err-regs rl@ ; : xac-erra@ ( -- l ) xac-err-regs 4 + rl@ ; : xac-errs@ ( -- l ) xac-err-regs 8 + rl@ ; : xac-ctl0@ ( -- w ) xac-ctl0 rl@ ; : xac-ctl0! ( w -- ) xac-ctl0 rl! ; : xac-ctl1@ ( -- w ) xac-ctl1 rl@ ; : xac-ctl1! ( w -- ) xac-ctl1 rl! ; : xac-elua@ ( -- l ) xac-elua rl@ ; : xac-elua! ( l -- ) xac-elua rl! ; : xac-ella@ ( -- w ) xac-ella rl@ ; : xac-ella! ( w -- ) xac-ella rl! ; : xbc-errd@ ( -- l ) xbc-err-regs rl@ ; : xbc-erra@ ( -- l ) xbc-err-regs 4 + rl@ ; : xbc-errs@ ( -- l ) xbc-err-regs 8 + rl@ ; : xbc-ctl0@ ( -- w ) xbc-ctl0 rl@ ; : xbc-ctl0! ( w -- ) xbc-ctl0 rl! ; : xbc-ctl1@ ( -- w ) xbc-ctl1 rl@ ; : xbc-ctl1! ( w -- ) xbc-ctl1 rl! ; : xbc-elua@ ( -- l ) xbc-elua rl@ ; : xbc-elua! ( l -- ) xbc-elua rl! ; : xbc-ella@ ( -- w ) xbc-ella rl@ ; : xbc-ella! ( w -- ) xbc-ella rl! ; \ Transparent Mode register access words external : unique-key ( -- n ) " unique-key" $call-parent ; headers unique-key constant my-key my-key xdrint " write0-key" attribute : xbox! ( w offset -- ) my-key h# 18 << or or write0-reg rl! ; : write-xac-ctl0 ( w -- ) xac-ctl0-offset xbox! ; : write-xac-ctl1 ( w -- ) xac-ctl1-offset xbox! ; : write-xbc-ctl0 ( w -- ) xbc-ctl0-offset xbox! ; : write-xbc-ctl1 ( w -- ) xbc-ctl1-offset xbox! ; \ Some functionally oriented words

\ complete hierarchical device driver sample : set-key ( -- ) my-key 8 << xac-ctl0! ; : transparent ( -- ) 1 xac-ctl1! ; : opaque ( -- ) 0 write-xac-ctl1 ; : enable-slaves ( -- ) h# 38 write-xbc-ctl1 ; : xbox-errors ( -- xbc-err xac-err ) opaque xbc-errd@ xac-errd@ transparent ; : ?.errors ( xbc-err xac-err -- ) dup h# 8000.0000 and if cr .me ." xac-error " .h cr else drop then dup h# 8000.0000 and if cr .me ." xbc-error " .h cr else drop then ; \ The address space of the XBox in transparent mode may be dynamically \ allocated across its plug-in slots. This is called the \ upper-address-decode-map (uadm). Below is a table which relates the \ slot configuration code which is programmed in hardware to the \ allocation of address space for each slot. The number in each cell is \ the number of address bits needed for the slot. decimal create slot-sizes-array \ slot0 slot1 slot2 slot3 slot-config 23 c, 23 c, 23 c, 23 c, \ 00 23 c, 23 c, 23 c, 23 c, \ 01 23 c, 23 c, 23 c, 23 c, \ 02 23 c, 23 c, 23 c, 23 c, \ 03 25 c, 0 c, 0 c, 0 c, \ 04 0 c, 25 c, 0 c, 0 c, \ 05 0 c, 0 c, 25 c, 0 c, \ 06 0 c, 0 c, 0 c, 25 c, \ 07 24 c, 24 c, 0 c, 0 c, \ 08 24 c, 0 c, 24 c, 0 c, \ 09 0 c, 24 c, 24 c, 0 c, \ 0a 0 c, 0 c, 0 c, 0 c, \ 0b 24 c, 23 c, 23 c, 0 c, \ 0c

\ complete hierarchical device driver sample 23 c, 24 c, 23 c, 0 c, \ 0d \ Overridden in code 23 c, 23 c, 24 c, 0 c, \ 0e \ Overridden in code 25 c, 0 c, 0 c, 0 c, \ 0f 26 c, 26 c, 26 c, 26 c, \ 10 26 c, 26 c, 26 c, 26 c, \ 11 26 c, 26 c, 26 c, 26 c, \ 12 26 c, 26 c, 26 c, 26 c, \ 13 28 c, 0 c, 0 c, 0 c, \ 14 0 c, 28 c, 0 c, 0 c, \ 15 0 c, 0 c, 28 c, 0 c, \ 16 0 c, 0 c, 0 c, 28 c, \ 17 28 c, 28 c, 28 c, 28 c, \ 18 28 c, 28 c, 28 c, 28 c, \ 19 28 c, 28 c, 28 c, 28 c, \ 1a 28 c, 28 c, 28 c, 28 c, \ 1b 0 c, 0 c, 0 c, 0 c, \ 1c 0 c, 0 c, 0 c, 0 c, \ 1d 0 c, 0 c, 0 c, 0 c, \ 1e 0 c, 0 c, 0 c, 0 c, \ 1f hex 20 constant /slot-sizes-array -1 value slot-config : >slot-size ( slot# -- size ) slot-sizes-array slot-config la+ swap ca+ c@ 1 swap << 1 not and \ Could have slot size of 0. ; \ This array is to be filled with offsets for each slot. \ Eg. 0, 100.0000, 180.0000, 200.0000 create host-offsets 0 , 0 , 0 , 0 , : >host-offset ( child-slot# -- adr ) host-offsets swap na+ @ ; create config-d-offsets h# 100.0000 , 0 , h# 180.0000 , 0 , create config-e-offsets h# 100.0000 , h# 180.0000 , 0 , 0 , : set-host-offsets ( -- ) slot-config case h# d of config-d-offsets host-offsets 4 /n* move exit endof h# e of config-e-offsets host-offsets 4 /n* move exit endof endcase 0 ( initial-offset )

\ complete hierarchical device driver sample 4 0 do ( offset ) dup host-offsets i na+ ! ( offset ) i >slot-size + ( offset' ) loop ( final-offset ) drop ; : set-configuration ( config-code -- ) is slot-config set-host-offsets slot-config 3 << my-key 8 << or dup write-xac-ctl0 \ set XAC write-xbc-ctl0 \ set XBC slot-config xdrint " uadm" attribute \ publish slot configuration ; \ Required package methods external : dma-alloc ( #bytes -- ) " dma-alloc" $call-parent ; : dma-free ( #bytes -- ) " dma-free" $call-parent ; : dma-map-in ( vaddr #bytes cache? -- devaddr ) " dma-map-in" $call-parent ; : dma-map-out ( vaddr devaddr #bytes -- ) " dma-map-out" $call-parent ; : dma-sync ( virt devaddr #bytes -- ) " dma-sync" $call-parent ; : map-in ( offset slot# size -- virtual ) >r ( offset xbox-slot# ) >host-offset + my-space ( parent-offset parent-slot# ) r> " map-in" $call-parent ( virtual ) ; : map-out ( virt size -- ) " map-out" $call-parent ; : decode-unit ( adr len -- address space ) decode-2int ( offset slot# ) dup 0 3 between 0= if ." Invalid XBox slot number " .d cr 1 abort then ( offset slot# ) ; \ Hack because set-args and byte-load are not FCodes : byte-load ( adr len -- ) " byte-load" $find drop execute ;

\ complete hierarchical device driver sample : set-args ( adr len adr len -- ) " set-args" $find drop execute ; : probe-self ( arg-adr arg-len reg-adr reg-len fcode-adr fcode-len -- ) ['] decode-unit catch if 2drop 2drop 2drop 2drop exit then ( arg-str reg-str fcode-offs,space ) h# 10000 map-in ( arg-str reg-str fcode-vaddr ) dup cpeek if ( arg-str reg-str fcode-vaddr byte ) dup h# f0 = swap h# fd = or if ( arg-str reg-str fcode-vaddr ) new-device ( arg-str reg-str fcode-vaddr ) >r set-args r> ( fcode-vaddr ) dup 1 byte-load ( fcode-vaddr ) finish-device else ( arg-str reg-str fcode-vaddr ) nip nip nip nip ( fcode-vaddr ) ." Invalid FCode start byte in " .me cr then ( fcode-vaddr ) else ( arg-str reg-str fcode-vaddr ) nip nip nip nip ( fcode-vaddr ) then h# 10000 map-out ; : open ( -- ok? ) true ; : close ( -- ) ; headers \ The XBox slot configuration may be forced by the user. The mechanism \ for doing this is a string which specifies megs/slot (eg. "16,8,8,0"). \ This string is processed into the config bits array. Then the \ slot-sizes-array is searched for a configuration which matches or \ exceeds the requested number for each slot. If the request is \ unreasonable the default-slot-config is used. \ Then the configuration is set in the XBox hardware. \ Finally each slot is probed based on the config. : default-slot-config ( -- n )

\ complete hierarchical device driver sample host-slot-size d# 25 = if h# c \ 1x24 bits, 2x23 bits else h# 10 \ 4x26 bits then ; \ This array to be filled with bit sizes for each slot. \ Eg. 24, 23, 23, 0 create config-bits 0 c, 0 c, 0 c, 0 c, : config-ok? ( config -- ok? ) true slot-sizes-array rot 4 * ca+ ( ok? slot-adr ) 4 0 do config-bits i ca+ c@ over i ca+ c@ ( ok? slot-adr conf-bits slot-bits ) > if nip false swap leave then loop drop ; : fit-config ( -- config ) default-slot-config /slot-sizes-array 0 do i config-ok? if drop i leave then loop ; : megs>bits ( megs -- bits ) \ Convert requested megs to # of address bits ?dup 0= if 0 exit then dup 9 < if drop d# 23 exit then dup d# 17 < if drop d# 24 exit then dup d# 33 < if drop d# 25 exit then dup d# 65 < if drop d# 26 exit then dup d# 129 < if drop d# 27 exit then d# 257 < if d# 28 exit then d# 29 \ d#29 is too many bits => error ; : request-megs ( adr len -- ) \ Fill config-bits table

\ complete hierarchical device driver sample base @ >r decimal 4 0 do ascii , left-parse-string $number 0= if megs>bits config-bits i ca+ c! then loop 2drop r> base ! ; : find-config ( adr len -- config ) request-megs fit-config ; create slot-string ascii # c, ascii , c, ascii 0 c, : probe-slot ( slot# -- ) dup >slot-size 0= if drop exit then ( slot# ) ascii 0 + slot-string c! " " slot-string 3 ( arg-str reg-str ) 2dup ( arg-str reg-str fcode-str ) probe-self ; : probe-children ( -- ) 4 0 do config-bits i ca+ c@ if i probe-slot then loop ; : forced-configuration ( adr len -- ) find-config ( config-code ) set-configuration probe-children ; \ The Xbox slot configuration may be autoconfigured by the driver. The \ autoconfiguration mechanism uses the following state transition table. \ The table basically loops through each XBox slot with a current guess \ at the slot config. With each slot the code then probes the slot's

\ complete hierarchical device driver sample \ FCode and uses the reg property information of the slot's new device \ node to determine the amount of address space required by the slot. \ The slot config guess is updated and a state transition is made. \ This is the state transition table. Each entry in the table consists \ of 16 bits. The most significant 8 bits is the XBox configuration \ code for the next state, and the least 8 bits is the next state. create states \ Empty min mid \ Empty 23 24 for 25 bit host SBus slot 0501 w, 0d04 w, 0803 w, \ 0 testing slot 0 0602 w, 0a05 w, 0a0f w, \ 1 Slot 0 empty, testing slot 1 0706 w, 000f w, 060e w, \ 2 Slots 0,1 empty, testing slot 2 090f w, 0c0f w, 080e w, \ 3 Slot 0 is 24 bit, testing slot 1 0e05 w, 0e05 w, 0d0f w, \ 4 Slot 0 23 bit, testing slot 1 000f w, 000f w, 0e0e w, \ 5 Slot 0 empty and Slot1 23 bit, \ or Slot 0,1 are 23 bit testing slot 2 0c0e w, 070e w, 070e w, \ 6 Slots 0,1,2 empty, testing slot 3 \ Empty notused 26 for 28 bit host SBus slot 1508 w, 100e w, 100b w, \ 7 testing slot 0 1609 w, 100e w, 100c w, \ 8 Slot 0 empty, testing slot 1 170a w, 100e w, 100d w, \ 9 Slots 0,1 empty, testing slot 2 100e w, 100e w, 170e w, \ a Slots 0,1,2 empty, testing slot 3 100c w, 100e w, 100c w, \ b Slot 0 is 26 bit, testing slot 1 100d w, 100e w, 100d w, \ c Slots 0,1 are 26 bit, testing slot 2 100e w, 100e w, 100e w, \ d Slots 0,1,2 are 26 bit,testing slot 3 \ e \ f 0 value slot# 0 value start-state \ for auto-config state machine 4 value start-config h# 100.0000 value max-card \ 25 bit default h# 080.0000 value mid-card \ 25 bit default : configure25 ( -- ) \ 25 bit host SBus slots 0 is start-state 4 is start-config h# 100.0000 is max-card \ 25 bits for one Xbox slot h# 080.0000 is mid-card \ 24 bits per XBox slot ; : configure28 ( -- ) \ 28 bit host SBus slots 7 is start-state

\ complete hierarchical device driver sample h# 14 is start-config h# 800.0000 is max-card \ 28 bits for one XBox slot h# 0 is mid-card \ 26 bits per Xbox slot ; 0 value child-node \ Since child and peer do not appear until 2.3, \ we include the following workarounds. : next-peer ( phandle -- phandle' ) fcode-version 2.0003 >= if peer else " romvec" $find drop execute 1c + @ 0 + @ " call" $find drop execute nip then ; : first-child ( phandle -- phandle' ) fcode-version 2.0003 >= if child else " romvec" $find drop execute 1c + @ 4 + @ " call" $find drop execute nip then ; 0 value extent \ 1 if card exists, but no reg prop or 0 reg : bump-extent ( n -- ) extent max is extent ; : max-reg-extent ( adr len -- ) begin dup while xdrtoint drop xdrtoint >r xdrtoint r> + ( adr' len' extent) bump-extent repeat 2drop extent 0= if \ reg prop is 0 -- fake it 1 bump-extent then ; : find-extent ( -- ) 0 is extent begin

\ complete hierarchical device driver sample child-node if child-node next-peer else my-self ihandle>phandle first-child then ( next-child ) ?dup while is child-node " reg" child-node get-package-attribute 0= if ( adr len ) max-reg-extent else \ card has no reg prop -- fake it 1 bump-extent then repeat ; : evaluate-size ( -- size-code ) find-extent extent slot# >slot-size > if ." The card in slot " slot# . ." of " .me ." uses too much address space." cr abort then extent ( max-extent ) dup max-card > if drop 3 exit then ( max-extent ) \ max-size card dup mid-card > if drop 2 exit then ( max-extent ) \ mid-size card? 0 > if 1 exit then ( ) \ 25-small card? 0 \ null for 28 ; : test-slot ( xbox-config -- size-code ) set-configuration ( ) slot# probe-slot ( ) evaluate-size ( size-code ) ; : autoconfigure ( -- ) 0 is child-node -1 is slot# host-slot-size d# 25 = if configure25 else configure28 then start-state start-config ( state# xbox-config ) begin ( state# xbox-config )

\ complete hierarchical device driver sample slot# 1+ is slot# test-slot ( state# size-code ) dup 3 = if 2drop exit then ( state# size-code ) over h# f = if 2drop exit then ( state# size-code ) states rot 3 * wa+ swap wa+ w@ wbsplit ( state#' xbox-config' ) over h# e = until ( state#' xbox-config' ) 2drop ; \ Initialize the XBox H/W. If the XAdaptor H/W detects that XBox \ Expansion H/W is connected and powered-up it puts the H/W into \ transparent mode and sets the XBox slot configuraton based on either a \ forced configruation or the autoconfiguration algorithm. : configuration ( -- ) " xbox-slot-config" get-inherited-attribute 0= if xdrtostring ( adr len adr len ) find-config forced-configuration 2drop else 2drop autoconfigure then ; : null-xdr ( -- adr len ) fcode-version 2.0001 >= if 0 0 xdrbytes else here 0 then ; : make-ranges ( -- ) null-xdr ( adr len ) 4 0 do i >slot-size if ( adr len ) 0 i xdrphys xdr+ ( adr len ) i >host-offset my-space xdrphys xdr+ ( adr len ) i >slot-size xdrint xdr+ ( adr len ) then loop " ranges" attribute ;

\ complete hierarchical device driver sample \ Because we go transparent in the middle and therefore the fcode prom \ disappears the following must be in a definition. : init-pkg ( -- ) map-regs set-key \ opaque already xac-errs@ h# 40 and if \ Child ready? transparent \ Go transparent, then enable-slaves enable-slaves configuration make-ranges xbox-errors ?.errors " true" else cr .me ." child not ready --" cr ." perhaps the cable is not plugged in" cr ." or the expansion box is not turned on." cr " false" then ( adr len ) xdrstring " child-present" attribute unmap-regs ['] end0 execute ; init-pkg end0