source: rtems-libbsd/libbsd.txt @ 7c77211

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1RTEMS BSD Library Guide
2=======================
3:toc:
4:icons:
5:numbered:
6:website: http://www.rtems.org/
7
8RTEMS uses FreeBSD 9.2 as the source of its TCP/IP and USB stacks.
9This is a guide which captures information on the
10process of merging code from FreeBSD, building this library,
11RTEMS specific support files, and general guidelines on what
12modifications to the FreeBSD source are permitted.
13
14Goals of this effort are
15
16* update TCP/IP and provide USB in RTEMS,
17* ease updating to future FreeBSD versions,
18* ease tracking changes in FreeBSD code,
19* minimize manual changes in FreeBSD code, and
20* define stable kernel/device driver API which is implemented
21by both RTEMS and FreeBSD. This is the foundation of the port.
22
23We will work to push our changes upstream to the FreeBSD Project
24and minimize changes required at each update point.
25
26*******************************************************************************
27This is a work in progress and is very likely to be incomplete.
28Please help by adding to it.
29*******************************************************************************
30
31== Getting Started
32
33=== Tool Chain ===
34
35You need a tool chain for RTEMS based on at least RSB 4.12 April 2016 or later.
36
37=== Installation Overview ===
38
39. You must configure your BSP with the +--disable-networking+ option to disable
40the old network stack.  Make sure no header files of the old network stack are
41installed.
42
43. Clone the Git repository +git clone git://git.rtems.org/rtems-libbsd.git+.
44. Change into the RTEMS BSD library root directory.
45. Edit the `config.inc` configuration file and adjust it to your environment.
46. Run +waf configure ...+.
47. Run +waf+.
48. Run +waf install+.
49
50Refer to the README.waf for Waf building instructions.
51
52Make sure the submodules have been initialised and are updated. If a 'git
53status' says `rtems_waf` need updating run the submodule update command:
54
55 $ git submodule rtems_waf update
56
57=== Board Support Package Requirements ===
58
59The RTEMS version must be at least 4.12.  The Board Support Package (BSP)
60should support the
61http://www.rtems.org/onlinedocs/doxygen/cpukit/html/group\__rtems\__interrupt__extension.html[Interrupt Manager Extension]
62// The first underscores have to be masked to stop asciidoc interpreting them
63to make use of generic FreeBSD based drivers.
64
65The linker command file of the BSP must contain the following section
66definitions:
67
68-------------------------------------------------------------------------------
69.rtemsroset : {
70        KEEP (*(SORT(.rtemsroset.*)))
71}
72
73.rtemsrwset : {
74        KEEP (*(SORT(.rtemsrwset.*)))
75}
76-------------------------------------------------------------------------------
77
78The first output section can be placed in read-only memory.  The second output
79section must be placed in read-write memory.  The output section name is not
80relevant.  The output sections may also contain other input sections.
81
82=== Board Support Package Configuration and Build ===
83
84You need to configure RTEMS for the desired BSP and install it.  The BSP should
85be configured with a disabled network stack.  The BSD library containing the
86new network stack is a separate package.  Using a BSP installation containing
87the old network stack may lead to confusion and unpredictable results.
88
89The following script is used to build the `arm/xilinx_zynq_a9_qemu` BSP for
90our internal testing purposes:
91
92-------------------------------------------------------------------------------
93#!/bin/sh
94
95cd ${HOME}/sandbox
96rm -rf b-xilinx_zynq_a9_qemu
97mkdir b-xilinx_zynq_a9_qemu
98cd b-xilinx_zynq_a9_qemu
99${HOME}/git-rtems/configure \
100        --prefix=${HOME}/sandbox/install \
101        --target=arm-rtems4.12 \
102        --enable-rtemsbsp=xilinx_zynq_a9_qemu \
103        --disable-networking && \
104        make && \
105        make install
106-------------------------------------------------------------------------------
107
108The `arm/xilinx_zynq_a9_qemu` BSP running on the Qemu simulator has some
109benefits for development and test of the BSD library
110
111* it offers a NULL pointer read and write protection,
112* Qemu is a fast simulator,
113* Qemu provides support for GDB watchpoints,
114* Qemu provides support for virtual Ethernet networks, e.g. TUN and bridge
115devices (you can run multiple test instances on one virtual network).
116
117=== BSD Library Configuration and Build ===
118
119The build system based on the Waf build system. To build with Waf please refer
120to the README.waf file.
121
122===== Example Configuration =====
123
124In the BSD library source directory edit the file `config.inc`.  Continuing on
125the above, the `config.inc` used to match the above is:
126
127-------------------------------------------------------------------------------
128# Mandatory: Select your BSP and installation prefix
129TARGET = arm-rtems4.12
130BSP = xilinx_zynq_a9_qemu
131PREFIX = $(HOME)/sandbox/install
132
133# Optional: Separate installation base directory
134INSTALL_BASE = $(PREFIX)/$(TARGET)/$(BSP)
135
136# Optional: Network test configuration
137TEST_RUNNER = $(BSP)
138NET_CFG_SELF_IP = 10.0.0.2
139NET_CFG_NETMASK = 255.255.0.0
140NET_CFG_PEER_IP = 10.0.0.1
141NET_CFG_GATEWAY_IP = 10.0.0.1
142NET_TAP_INTERFACE = tap0
143-------------------------------------------------------------------------------
144
145=== BSD Library Initialization ===
146
147To initialise the BSD Library create a suitable rc.conf file. The FreeBSD man
148page rc.conf(5) provides the details needed to create a suitable format file:
149
150 https://www.freebsd.org/cgi/man.cgi?rc.conf
151
152You can call one of three functions to run the initialisation once BSD has
153initialised:
154
155 - rtems_bsd_run_etc_rc_conf: Run /etc/rc.conf.
156 - rtems_bsd_run_rc_conf: Run a user supplied file.
157 - rtems_bsd_run_rc_conf_script: Run the in memory line feed separated text string.
158
159For exapmle:
160
161 void
162 network_init(void)
163 {
164   rtems_status_code sc;
165
166   sc = rtems_bsd_initialize();
167   assert(sc == RTEMS_SUCCESSFUL);
168
169   rtems_bsd_run_etc_rc_conf(true); /* verbose = true */
170
171}
172
173By default the networking support is builtin. Other directives can be added and
174are found in 'machine/rtems-bsd-rc-conf-directives.h'. Please check the file
175for the list.
176
177The following network names are supported:
178
179  cloned_interfaces
180  ifconfig_'interface'
181  defaultrouter
182  hostname
183
184For example:
185
186 #
187 # My BSD initialisation.
188 #
189 hostname="myhost"
190 cloned_interfaces="vlan0 vlan1"
191 ifconfig_re0="inet inet 10.10.10.10 netmask 255.255.255.0"
192 fconfig_vlan0="inet 10.11.10.10 255.255.255.0 vlan 101 vlandev re0"
193 defaultrouter="10.10.10.1"
194
195You can also intialise the BSD library using code. The following code to
196initialize the BSD library:
197
198-------------------------------------------------------------------------------
199#include <assert.h>
200#include <sysexits.h>
201
202#include <machine/rtems-bsd-commands.h>
203#include <rtems/bsd/bsd.h>
204
205static void
206network_ifconfig_lo0(void)
207{
208        int exit_code;
209        char *lo0[] = {
210                "ifconfig",
211                "lo0",
212                "inet",
213                "127.0.0.1",
214                "netmask",
215                "255.255.255.0",
216                NULL
217        };
218        char *lo0_inet6[] = {
219                "ifconfig",
220                "lo0",
221                "inet6",
222                "::1",
223                "prefixlen",
224                "128",
225                NULL
226        };
227
228        exit_code = rtems_bsd_command_ifconfig(RTEMS_BSD_ARGC(lo0), lo0);
229        assert(exit_code == EX_OK);
230
231        exit_code = rtems_bsd_command_ifconfig(RTEMS_BSD_ARGC(lo0_inet6), lo0_inet6);
232        assert(exit_code == EX_OK);
233}
234
235void
236network_init(void)
237{
238        rtems_status_code sc;
239
240        sc = rtems_bsd_initialize();
241        assert(sc == RTEMS_SUCCESSFUL);
242
243        network_ifconfig_lo0();
244}
245-------------------------------------------------------------------------------
246
247This performs the basic network stack initialization with a loopback interface.
248Further initialization must be done using the standard BSD network
249configuration commands
250http://www.freebsd.org/cgi/man.cgi?query=ifconfig&apropos=0&sektion=8&manpath=FreeBSD+9.2-RELEASE&arch=default&format=html[IFCONFIG(8)]
251using `rtems_bsd_command_ifconfig()` and
252http://www.freebsd.org/cgi/man.cgi?query=route&apropos=0&sektion=8&manpath=FreeBSD+9.2-RELEASE&arch=default&format=html[ROUTE(8)]
253using `rtems_bsd_command_route()`.  For an example please have a look at
254`testsuite/include/rtems/bsd/test/default-network-init.h`.
255
256=== Task Priorities and Stack Size ===
257
258The default task priority is 96 for the interrupt server task (name "IRQS"), 98
259for the timer server task (name "TIME") and 100 for all other tasks.  The
260application may provide their own implementation of the
261`rtems_bsd_get_task_priority()` function (for example in the module which calls
262`rtems_bsd_initialize()`) if different values are desired.
263
264The task stack size is determined by the `rtems_bsd_get_task_stack_size()`
265function which may be provided by the application in case the default is not
266appropriate.
267
268=== Size for Allocator Domains ===
269
270The size for an allocator domain can be specified via the
271`rtems_bsd_get_allocator_domain_size()` function.  The application may provide
272their own implementation of the `rtems_bsd_get_allocator_domain_size()`
273function (for example in the module which calls `rtems_bsd_initialize()`) if
274different values are desired.  The default size is 8MiB for all domains.
275
276== Network Stack Features
277
278http://roy.marples.name/projects/dhcpcd/index[DHCPCD(8)]:: DHCP client
279
280https://developer.apple.com/library/mac/documentation/Networking/Reference/DNSServiceDiscovery_CRef/Reference/reference.html[dns_sd.h]:: DNS Service Discovery
281
282http://www.opensource.apple.com/source/mDNSResponder/mDNSResponder-320.10/mDNSCore/mDNSEmbeddedAPI.h[mDNS]:: Multi-Cast DNS
283
284http://www.freebsd.org/cgi/man.cgi?query=unix&sektion=4&apropos=0&manpath=FreeBSD+9.2-RELEASE[UNIX(4)]:: UNIX-domain protocol family
285
286http://www.freebsd.org/cgi/man.cgi?query=inet&sektion=4&apropos=0&manpath=FreeBSD+9.2-RELEASE[INET(4)]:: Internet protocol family
287
288http://www.freebsd.org/cgi/man.cgi?query=inet6&apropos=0&sektion=4&manpath=FreeBSD+9.2-RELEASE&arch=default&format=html[INET6(4)]:: Internet protocol version 6 family
289
290http://www.freebsd.org/cgi/man.cgi?query=tcp&apropos=0&sektion=4&manpath=FreeBSD+9.2-RELEASE&arch=default&format=html[TCP(4)]:: Internet Transmission Control Protocol
291
292http://www.freebsd.org/cgi/man.cgi?query=udp&apropos=0&sektion=4&manpath=FreeBSD+9.2-RELEASE&arch=default&format=html[UDP(4)]:: Internet User Datagram Protocol
293
294http://www.freebsd.org/cgi/man.cgi?query=route&sektion=4&apropos=0&manpath=FreeBSD+9.2-RELEASE[ROUTE(4)]:: Kernel packet forwarding database
295
296http://www.freebsd.org/cgi/man.cgi?query=bpf&apropos=0&sektion=4&manpath=FreeBSD+9.2-RELEASE&arch=default&format=html[BPF(4)]:: Berkeley Packet Filter
297
298http://www.freebsd.org/cgi/man.cgi?query=socket&apropos=0&sektion=2&manpath=FreeBSD+9.2-RELEASE&arch=default&format=html[SOCKET(2)]:: Create an endpoint for communication
299
300http://www.freebsd.org/cgi/man.cgi?query=kqueue&apropos=0&sektion=2&manpath=FreeBSD+9.2-RELEASE&arch=default&format=html[KQUEUE(2)]:: Kernel event notification mechanism
301
302http://www.freebsd.org/cgi/man.cgi?query=select&apropos=0&sektion=2&manpath=FreeBSD+9.2-RELEASE&arch=default&format=html[SELECT(2)]:: Synchronous I/O multiplexing
303
304http://www.freebsd.org/cgi/man.cgi?query=poll&apropos=0&sektion=2&manpath=FreeBSD+9.2-RELEASE&arch=default&format=html[POLL(2)]:: Synchronous I/O multiplexing
305
306http://www.freebsd.org/cgi/man.cgi?query=route&apropos=0&sektion=8&manpath=FreeBSD+9.2-RELEASE&arch=default&format=html[ROUTE(8)]:: Manually manipulate the routing tables
307
308http://www.freebsd.org/cgi/man.cgi?query=ifconfig&apropos=0&sektion=8&manpath=FreeBSD+9.2-RELEASE&arch=default&format=html[IFCONFIG(8)]:: Configure network interface parameters
309
310http://www.freebsd.org/cgi/man.cgi?query=netstat&apropos=0&sektion=1&manpath=FreeBSD+9.2-RELEASE&arch=default&format=html[NETSTAT(1)]:: Show network status
311
312http://www.freebsd.org/cgi/man.cgi?query=ping&apropos=0&sektion=8&manpath=FreeBSD+9.2-RELEASE&arch=default&format=html[PING(8)]:: Send ICMP ECHO_REQUEST packets to network hosts
313
314http://www.freebsd.org/cgi/man.cgi?query=ping6&apropos=0&sektion=8&manpath=FreeBSD+9.2-RELEASE&arch=default&format=html[PING6(8)]:: Send ICMPv6 ECHO_REQUEST packets to network hosts
315
316http://www.freebsd.org/cgi/man.cgi?query=sysctl&sektion=3&apropos=0&manpath=FreeBSD+9.2-RELEASE[SYSCTL(3)]:: Get or set system information
317
318http://www.freebsd.org/cgi/man.cgi?query=resolver&sektion=3&apropos=0&manpath=FreeBSD+9.2-RELEASE[RESOLVER(3)]:: Resolver routines
319
320http://www.freebsd.org/cgi/man.cgi?query=gethostbyname&sektion=3&apropos=0&manpath=FreeBSD+9.2-RELEASE[GETHOSTBYNAME(3)]:: Get network host entry
321
322== Network Interface Drivers
323
324=== Link Up/Down Events
325
326You can notifiy the application space of link up/down events in your network
327interface driver via the if_link_state_change(LINK_STATE_UP/LINK_STATE_DOWN)
328function.  The DHCPCD(8) client is a consumer of these events for example.
329Make sure that the interface flag IFF_UP and the interface driver flag
330IFF_DRV_RUNNING is set in case the link is up, otherwise ether_output() will
331return the error status ENETDOWN.
332
333== Shell Commands
334
335=== HOSTNAME(1)
336
337In addition to the standard options the RTEMS version of the HOSTNAME(1)
338command supports the -m flag to set/get the multicast hostname of the
339mDNS resolver instance.  See also rtems_mdns_sethostname() and
340rtems_mdns_gethostname().
341
342== Qemu
343
344Use the following script to set up a virtual network with three tap devices
345connected via one bridge device.
346
347-------------------------------------------------------------------------------
348#!/bin/sh -x
349
350user=`whoami`
351interfaces=(1 2 3)
352
353tap=qtap
354bri=qbri
355
356case $1 in
357        up)
358                sudo -i brctl addbr $bri
359                for i in ${interfaces[@]} ; do
360                        sudo -i tunctl -t $tap$i -u $user ;
361                        sudo -i ifconfig $tap$i up ;
362                        sudo -i brctl addif $bri $tap$i ;
363                done
364                sudo -i ifconfig $bri up
365                ;;
366        down)
367                for i in ${interfaces[@]} ; do
368                        sudo -i ifconfig $tap$i down ;
369                        sudo -i tunctl -d $tap$i ;
370                done
371                sudo -i ifconfig $bri down
372                sudo -i brctl delbr $bri
373                ;;
374esac
375-------------------------------------------------------------------------------
376
377Connect your Qemu instance to one of the tap devices, e.g.
378
379-------------------------------------------------------------------------------
380qemu-system-i386 -m 512 -boot a -cpu pentium3 \
381        -drive file=$HOME/qemu/pc386_fda,index=0,if=floppy,format=raw \
382        -drive file=fat:$HOME/qemu/hd,format=raw \
383        -net nic,model=e1000,macaddr=0e:b0:ba:5e:ba:11 \
384        -net tap,ifname=qtap1,script=no,downscript=no \
385        -nodefaults -nographic -serial stdio
386-------------------------------------------------------------------------------
387
388-------------------------------------------------------------------------------
389qemu-system-arm \
390        -serial null \
391        -serial mon:stdio \
392        -nographic \
393        -M xilinx-zynq-a9 \
394        -net nic,model=cadence_gem,macaddr=0e:b0:ba:5e:ba:11 \
395        -net tap,ifname=qtap1,script=no,downscript=no \
396        -m 256M \
397        -kernel build/arm-rtems4.12-xilinx_zynq_a9_qemu/media01.exe
398-------------------------------------------------------------------------------
399
400Make sure that each Qemu instance uses its own MAC address to avoid an address
401conflict (or otherwise use it as a test).
402
403To connect the Qemu instances with your local network use the following
404(replace 'eth0' with the network interface of your host).
405
406-------------------------------------------------------------------------------
407ifconfig eth0 0.0.0.0
408brctl addif qbri eth0
409dhclient qbri
410-------------------------------------------------------------------------------
411
412=== VDE and QEMU
413
414On FreeBSD you can create VDE or the Virtual Distributed Ethernet to create a
415network environment that does not need to run qemu as root or needing to drop
416the tap's privileges to run qemu.
417
418VDE creates a software switch with a default of 32 ports which means a single
419kernel tap can support 32 qemu networking sessions.
420
421To use VDE you need to build qemu with VDE support. The RSB can detect a VDE
422plug and enable VDE support in qemu when building. On FreeBSD install the VDE
423support with:
424
425 # pkg install -u vde2
426
427Build qemu with the RSB.
428
429To network create a bridge and a tap. The network is 10.10.1.0/24. On FreeBSD
430add to your /etc/rc.conf:
431
432 cloned_interfaces="bridge0 tap0"
433 autobridge_interfaces="bridge0"
434 autobridge_bridge0="re0 tap0"
435 ifconfig_re0="up"
436 ifconfig_tap0="up"
437 ifconfig_bridge0="inet 10.1.1.2 netmask 255.255.255.0"
438 defaultrouter="10.10.1.1"
439
440Start the VDE switch as root:
441
442 # sysctl net.link.tap.user_open=1
443 # sysctl net.link.tap.up_on_open=1
444 # vde_switch -d -s /tmp/vde1 -M /tmp/mgmt1 -tap tap0 -m 660 --mgmtmode 660
445 # chmod 660 /dev/tap0
446
447You can connect to the VDE switch's management channel using:
448
449 $ vdeterm /tmp/mgmt1
450
451To run qemu:
452
453 $ qemu-system-arm \
454        -serial null \
455        -serial mon:stdio \
456        -nographic \
457        -M xilinx-zynq-a9 \
458        -net nic,model=cadence_gem,macaddr=0e:b0:ba:5e:ba:11 \
459        -net vde,id=vde0,sock=/tmp/vde1
460        -m 256M \
461        -kernel build/arm-rtems4.12-xilinx_zynq_a9_qemu/rcconf02.exe
462
463== Issues and TODO
464
465* PCI support on x86 uses a quick and dirty hack, see pci_reserve_map().
466
467* Priority queues are broken with clustered scheduling.
468
469* Per-CPU data should be enabled once the new stack is ready for SMP.
470
471* Per-CPU NETISR(9) should be enabled onece the new stack is ready for SMP.
472
473* Multiple routing tables are not supported.  Every FIB value is set to zero
474  (= BSD_DEFAULT_FIB).
475
476* Process identifiers are not supported.  Every PID value is set to zero
477  (= BSD_DEFAULT_PID).
478
479* User credentials are not supported.  The following functions allow the
480  operation for everyone
481  - prison_equal_ip4(),
482  - chgsbsize(),
483  - cr_cansee(),
484  - cr_canseesocket() and
485  - cr_canseeinpcb().
486
487* A basic USB functionality test that is known to work on Qemu is desirable.
488
489* Adapt generic IRQ PIC interface code to Simple Vectored Interrupt Model
490  so that those architectures can use new TCP/IP and USB code.
491
492* freebsd-userspace/rtems/include/sys/syslog.h is a copy from the old
493  RTEMS TCP/IP stack. For some reason, the __printflike markers do not
494  compile in this environment. We may want to use the FreeBSD syslog.h
495  and get this addressed.
496
497* in_cksum implementations for architectures not supported by FreeBSD.
498  This will require figuring out where to put implementations that do
499  not originate from FreeBSD and are populated via the script.
500
501* MAC support functions are not thread-safe ("freebsd/lib/libc/posix1e/mac.c").
502
503* IFCONFIG(8): IEEE80211 support is disabled.  This module depends on a XML
504  parser and mmap().
505
506* get_cyclecount(): The implementation is a security problem.
507
508* What to do with the priority parameter present in the FreeBSD synchronization
509  primitives and the thread creation functions?
510
511* TASKQUEUE(9): Support spin mutexes.
512
513* ZONE(9): Review allocator lock usage in rtems-bsd-chunk.c.
514
515* KQUEUE(2): Choose proper lock for global kqueue list.
516
517* TIMEOUT(9): Maybe use special task instead of timer server to call
518  callout_tick().
519
520* sysctl_handle_opaque(): Implement reliable snapshots.
521
522* PING6(8): What to do with SIGALARM?
523
524* <sys/param.h>: Update Newlib to use a MSIZE of 256.
525
526* BPF(4): Add support for zero-copy buffers.
527
528* UNIX(4): Fix race conditions in the area of socket object and file node
529  destruction.  Add support for file descriptor transmission via control
530  messages.
531
532* PRINTF(9): Add support for log(), the %D format specifier is missing in the
533  normal printf() family.
534
535* Why is the interrupt server used?  The BSD interrupt handlers can block on
536synchronization primitives like mutexes.  This is in contrast to RTEMS
537interrupt service routines.  The BSPs using the generic interrupt support must
538implement the `bsp_interrupt_vector_enable()` and
539`bsp_interrupt_vector_disable()` routines.  They normally enable/disable a
540particular interrupt source at the interrupt controller.  This can be used to
541implement the interrupt server.  The interrupt server is a task that wakes-up
542in case an associated interrupt happens.  The interrupt source is disabled in
543a generic interrupt handler that wakes-up the interrupt server task.   Once the
544postponed interrupt processing is performed in the interrupt server the
545interrupt source is enabled again.
546
547* Convert all BSP linkcmds to use a linkcmds.base so the sections are
548easier to insert.
549
550* NIC Device Drivers
551- Only common PCI NIC drivers have been included in the initial set. These
552do not include any system on chip or ISA drivers.
553- PCI configuration probe does not appear to happen to determine if a
554NIC is in I/O or memory space. We have worked around this by using a
555static hint to tell the fxp driver the correct mode. But this needs to
556be addressed.
557- The ISA drivers require more BSD infrastructure to be addressed. This was
558outside the scope of the initial porting effort.
559
560== FreeBSD Source
561
562You should be able to rely on FreebSD manual pages and documentation
563for details on the code itself.
564
565=== Automatically Generated FreeBSD Files
566
567Some source and header files are automatically generated during the FreeBSD
568build process.  The `Makefile.todo` file performs this manually.  The should be
569included in `freebsd-to-rtems.py` script some time in the future.  For details,
570see also
571http://www.freebsd.org/cgi/man.cgi?query=kobj&sektion=9&apropos=0&manpath=FreeBSD+9.2-RELEASE[KOBJ(9)].
572
573=== Rules for Modifying FreeBSD Source
574
575Only add lines.  If your patch contains lines starting with a '-', then this is
576wrong.  Subtract code by added `#ifndef __rtems__`.  This makes merging easier
577in the future.  For example:
578
579-------------------------------------------------------------------------------
580/* Global variables for the kernel. */
581
582#ifndef __rtems__
583/* 1.1 */
584extern char kernelname[MAXPATHLEN];
585#endif /* __rtems__ */
586
587extern int tick;                        /* usec per tick (1000000 / hz) */
588-------------------------------------------------------------------------------
589
590-------------------------------------------------------------------------------
591#if defined(_KERNEL) || defined(_WANT_FILE)
592#ifdef __rtems__
593#include <rtems/libio_.h>
594#include <sys/fcntl.h>
595#endif /* __rtems__ */
596/*
597 * Kernel descriptor table.
598 * One entry for each open kernel vnode and socket.
599 *
600 * Below is the list of locks that protects members in struct file.
601 *
602 * (f) protected with mtx_lock(mtx_pool_find(fp))
603 * (d) cdevpriv_mtx
604 * none not locked
605 */
606-------------------------------------------------------------------------------
607
608-------------------------------------------------------------------------------
609extern int profprocs;                   /* number of process's profiling */
610#ifndef __rtems__
611extern volatile int ticks;
612#else /* __rtems__ */
613#include <rtems/score/watchdogimpl.h>
614#define ticks _Watchdog_Ticks_since_boot
615#endif /* __rtems__ */
616
617#endif /* _KERNEL */
618-------------------------------------------------------------------------------
619
620Add nothing (even blank lines) before or after the `__rtems__` guards.  Always
621include a `__rtems__` in the guards to make searches easy, so use
622
623* `#ifndef __rtems__`,
624* `#ifdef __rtems__`,
625* `#else /* __rtems__ */`, and
626* `#endif /* __rtems__ */`.
627
628The guards must start at the begin of the line.  Examples for wrong guards:
629
630-------------------------------------------------------------------------------
631static void
632guards_must_start_at_the_begin_of_the_line(int j)
633{
634
635        #ifdef __rtems__
636        return (j + 1);
637        #else /* __rtems__ */
638        return (j + 2);
639        #endif /* __rtems__ */
640}
641
642static void
643missing_rtems_comments_in_the_guards(int j)
644{
645
646#ifdef __rtems__
647        return (j + 3);
648#else
649        return (j + 4);
650#endif
651}
652-------------------------------------------------------------------------------
653
654The FreeBSD build and configuration system uses option header files, e.g.
655`#include "opt_xyz.h"` in an unmodified FreeBSD file.  This include is
656transformed by the import script into `#include <rtems/bsd/local/opt_xyz.h>`.  Do
657not disable option header includes via guards.  Instead, add an empty option
658header, e.g. `touch rtemsbsd/include/rtems/bsd/local/opt_xyz.h`.
659-------------------------------------------------------------------------------
660/* WRONG */
661#ifndef __rtems__
662#include <rtems/bsd/local/opt_xyz.h>
663#endif /* __rtems__ */
664-------------------------------------------------------------------------------
665
666In general, provide empty header files and do not guard includes.
667
668For new code use
669http://www.freebsd.org/cgi/man.cgi?query=style&apropos=0&sektion=9&manpath=FreeBSD+9.2-RELEASE&arch=default&format=html[STYLE(9)].
670
671Do not format original FreeBSD code.
672
673== BSD Library Source
674
675=== What is in the Git Repository
676
677There is a self-contained kit with FreeBSD and RTEMS components pre-merged. The
678Waf wscript in this kit is automatically generated.
679
680Any changes to source in the `freebsd` directories will need to be merged
681upstream into our master FreeBSD checkout, the `freebsd-org` submodule.
682
683The repository contains two FreeBSD source trees.  In the `freebsd` directory
684are the so called 'managed' FreeBSD sources used to build the BSD library.  The
685FreeBSD source in `freebsd-org` is the 'master' version.  The
686`freebsd-to-rtems.py` script is used to transfer files between the two trees.
687In general terms, if you have modified managed FreeBSD sources, you will need
688to run the script in 'revert' or 'reverse' mode using the `-R` switch.  This
689will copy the source back to your local copy of the master FreeBSD source so
690you can run `git diff` against the upstream FreeBSD source.  If you want to
691transfer source files from the master FreeBSD source to the manged FreeBSD
692sources, then you must run the script in 'forward' mode (the default).
693
694=== Organization
695
696The top level directory contains a few directories and files. The following
697are important to understand
698
699* `freebsd-to-rtems.py` - script to convert to and free FreeBSD and RTEMS trees,
700* `create-kernel-namespace.sh` - script to create the kernel namespace header <machine/rtems-bsd-kernel-namespace.h,
701* `wscript` - automatically generated,
702* `freebsd/` - from FreeBSD by script,
703* `rtemsbsd/` - RTEMS specific implementations of FreeBSD kernel support routines,
704* `testsuite/` - RTEMS specific tests, and
705* `libbsd.txt` - documentation in Asciidoc.
706
707== Moving Code Between Managed and Master FreeBSD Source
708
709The script `freebsd-to-rtems.py` is used to copy code from FreeBSD to the
710rtems-libbsd tree and to reverse this process. This script attempts to
711automate this process as much as possible and performs some transformations
712on the FreeBSD code. Its command line arguments are shown below:
713
714----
715freebsd-to-rtems.py [args]
716  -?|-h|--help      print this and exit
717  -d|--dry-run      run program but no modifications
718  -D|--diff         provide diff of files between trees
719  -e|--early-exit   evaluate arguments, print results, and exit
720  -m|--makefile     Warning: depreciated and will be removed
721  -b|--buildscripts just generate the build scripts
722  -S|--stats        Print a statistics report
723  -R|--reverse      default FreeBSD -> RTEMS, reverse that
724  -r|--rtems        RTEMS Libbsd directory (default: '.')
725  -f|--freebsd      FreeBSD SVN directory (default: 'freebsd-org')
726  -v|--verbose      enable verbose output mode
727----
728
729In its default mode of operation, freebsd-to-rtems.py is used to copy code
730from FreeBSD to the rtems-libbsd tree and perform transformations.  In forward
731mode, the script may be requested to just generate the Waf script.
732
733In "reverse mode", this script undoes those transformations and copies
734the source code back to the FreeBSD SVN tree. This allows us to do
735'svn diff', evaluate changes made by the RTEMS Project, and report changes
736back to FreeBSD upstream.
737
738In either mode, the script may be asked to perform a dry-run or be verbose.
739Also, in either mode, the script is also smart enough to avoid copying over
740files which have not changed. This means that the timestamps of files are
741not changed unless the contents change. The script will also report the
742number of files which changed. In verbose mode, the script will print
743the name of the files which are changed.
744
745To add or update files in the RTEMS FreeBSD tree first run the 'reverse mode'
746and move the current set of patches FreeBSD. The script may warn you if a file
747is not present at the destination for the direction. This can happen as files
748not avaliable at the FreeBSD snapshot point have been specially added to the
749RTEMS FreeBSD tree. Warnings can also appear if you have changed the list of
750files in libbsd.py. The reverse mode will result in the FreeBSD having
751uncommitted changes. You can ignore these. Once the reverse process has
752finished edit libbsd.py and add any new files then run the forwad mode to bring
753those files into the RTEMS FreeBSD tree.
754
755The following is an example forward run with no changes.
756
757----
758$ ~/newbsd/git/libbsd-8.2/freebsd-to-rtems.py \
759    -r /home/joel/newbsd/git/libbsd-8.2 \
760    -f /home/joel/newbsd/libbsd/freebsd-8.2 -v
761Verbose:                yes (1)
762Dry Run:                no
763Only Generate Makefile: no
764RTEMS Directory:        /home/joel/newbsd/git/libbsd-8.2
765FreeBSD Directory:      /home/joel/newbsd/libbsd/freebsd-8.2
766Direction:              forward
767Generating into /home/joel/newbsd/git/libbsd-8.2
7680 files were changed.
769----
770
771The script may also be used to generate a diff in either forward or reverse
772direction.
773
774You can add more than one verbose option (-v) to the command line and get more
775detail and debug level information from the command.
776
777== FreeBSD version of imported files and directories
778
779. sys/dev/dwc/*, trunk, 2015-03-26, cfc3df2b8f708ce8494d9d556e3472a5c8c21b8a
780. sys/dev/mmc/*, trunk, 2016-08-23, 9fe7c416e6abb28b1398fd3e5687099846800cfd
781. sys/dev/usb/*, trunk, 2015-10-30, 968dafb4fcf133cb8beb6fa3c558fecd7dc00ef0
782. *, stable/9, 2015-04-08, 99a648a912e81e29d9c4c159cbbe263462f2d719
783
784== How to import code from FreeBSD
785
786. In case you import files from a special FreeBSD version, then update the list above.
787. Run `git status` and make sure your working directory is clean.
788. Run `./freebsd-to-rtems.py -R`
789. Run `./freebsd-to-rtems.py`
790. Run `git status` and make sure your working directory is clean.  If you see modified files, then the `freebsd-to-rtems.py` script needs to be fixed first.
791. Add the files to import to `libbsd.py`.
792. Run `./freebsd-to-rtems.py`
793. Immediately check in the imported files without the changes to `libbsd_waf.py`.  Do not touch the imported files yourself at this point.
794. Port the imported files to RTEMS.  See 'Rules for Modifying FreeBSD Source'.
795. Add a test to the testsuite if possible.
796. Run `./create-kernel-namespace.sh` if you imported kernel space headers.  Add only your new defines via `git add -p rtemsbsd/include/machine/rtems-bsd-kernel-namespace.h`.
797. Create one commit from this.
798
799The -S or --stats option generates reports the changes we have made to
800FreeBSD. If the code has been reserved into the original FreeBSD tree it will
801show nothing has changed. To see what we have change:
802
803 $ cd freebsd-org
804 $ git checkout -- .
805 $ cd ..
806 $ ./freebsd-to-rtems.py -R -S -d
807
808The report lists the files change based on the opacity level. The opacity is a
809measure on how much of a file differs from the original FreeBSD source. The
810lower the value the more transparent the source file it.
811
812== Porting of user space utilities
813
814The theory behind the described method is to put all BSS and initialized data
815objects into a named section. This section then will be saved before the code is
816executed and restored after it has finished. This method limits to a single
817threaded execution of the application but minimizes the necessary changes to the
818original FreeBSD code.
819
820. Import and commit the unchanged source files like described above.
821. Add the files to the libbsd.py and build them.
822. Use nm on the generated object files to find out which objects are initialized
823  (either in BSS -- type b or B -- or in the initialized data segment -- type d
824  or D). An example call could look like follows:
825  `arm-rtems4.12-nm build/arm-rtems4.12-xilinx_zynq_a9_qemu/freebsd/contrib/pf/pfctl/pfctl.c.10.o | grep ' [DdbB] '`
826. Check the sources for everything that can be made const. This type of patches
827  should go back to the upstream FreeBSD sources.
828. Check the sources for every global variable that can be made static. This type
829  of patches should go back to the upstream FreeBSD sources.
830. Move static variables out of functions. This patches should also go upstream.
831. Create one `xxx-data.h` file per c module. This header should contain
832  declarations for the remaining initialized objects matching the original
833  declarations but adding a section attribute. The section name has to match the
834  name of the RTEMS_LINKER_RWSET defined further below. For an example look at
835  `freebsd/contrib/pf/pfctl/pfctl-data.h`.
836. Include the header files at the end of the corresponding c files.
837. Add a rtems_bsd_command_xxx wrapper function to the c file containing the main
838  function. For an example look at `rtems_bsd_command_pfctl(...)` in
839  `freebsd/contrib/pf/pfctl/pfctl.c`.
840. Create one compilable commit.
841
842== Initialization of the BSD Library
843
844The initialization of the BSD library is based on the FreeBSD SYSINIT(9)
845infrastructure.  The key to initializing a system is to ensure that the desired
846device drivers are explicitly pulled into the linked application.  This plus
847linking against the BSD library (`libbsd.a`) will pull in the necessary FreeBSD
848infrastructure.
849
850The FreeBSD kernel is not a library like the RTEMS kernel.  It is a bunch of
851object files linked together.  If we have a library, then creating the
852executable is simple.  We begin with a start symbol and recursively resolve all
853references.  With a bunch of object files linked together we need a different
854mechanism.  Most object files don't know each other.  Lets say we have a driver
855module.  The rest of the system has no references to this driver module.  The
856driver module needs a way to tell the rest of the system: Hey, kernel I am
857here, please use my services!
858
859This registration of independent components is performed by SYSINIT(9) and
860specializations:
861
862http://www.freebsd.org/cgi/man.cgi?query=SYSINIT
863
864The SYSINIT(9) uses some global data structures that are placed in a certain
865section.  In the linker command file we need this:
866
867-------------------------------------------------------------------------------
868.rtemsroset : {
869        KEEP (*(SORT(.rtemsroset.*)))
870}
871
872.rtemsrwset : {
873        KEEP (*(SORT(.rtemsrwset.*)))
874}
875-------------------------------------------------------------------------------
876
877This results for example in this executable layout:
878
879-------------------------------------------------------------------------------
880[...]
881 *(SORT(.rtemsroset.*))
882 .rtemsroset.bsd.modmetadata_set.begin
883                0x000000000025fe00        0x0 libbsd.a(rtems-bsd-init.o)
884                0x000000000025fe00                _bsd__start_set_modmetadata_set
885 .rtemsroset.bsd.modmetadata_set.content
886                0x000000000025fe00        0x8 libbsd.a(rtems-bsd-nexus.o)
887 .rtemsroset.bsd.modmetadata_set.content
888                0x000000000025fe08        0x4 libbsd.a(kern_module.o)
889[...]
890 .rtemsroset.bsd.modmetadata_set.content
891                0x000000000025fe68        0x4 libbsd.a(mii.o)
892 .rtemsroset.bsd.modmetadata_set.content
893                0x000000000025fe6c        0x4 libbsd.a(mii_bitbang.o)
894 .rtemsroset.bsd.modmetadata_set.end
895                0x000000000025fe70        0x0 libbsd.a(rtems-bsd-init.o)
896                0x000000000025fe70                _bsd__stop_set_modmetadata_set
897[...]
898.rtemsrwset     0x000000000030bad0      0x290
899 *(SORT(.rtemsrwset.*))
900 .rtemsrwset.bsd.sysinit_set.begin
901                0x000000000030bad0        0x0 libbsd.a(rtems-bsd-init.o)
902                0x000000000030bad0                _bsd__start_set_sysinit_set
903 .rtemsrwset.bsd.sysinit_set.content
904                0x000000000030bad0        0x4 libbsd.a(rtems-bsd-nexus.o)
905 .rtemsrwset.bsd.sysinit_set.content
906                0x000000000030bad4        0x8 libbsd.a(rtems-bsd-thread.o)
907 .rtemsrwset.bsd.sysinit_set.content
908                0x000000000030badc        0x4 libbsd.a(init_main.o)
909[...]
910 .rtemsrwset.bsd.sysinit_set.content
911                0x000000000030bd54        0x4 libbsd.a(frag6.o)
912 .rtemsrwset.bsd.sysinit_set.content
913                0x000000000030bd58        0x8 libbsd.a(uipc_accf.o)
914 .rtemsrwset.bsd.sysinit_set.end
915                0x000000000030bd60        0x0 libbsd.a(rtems-bsd-init.o)
916                0x000000000030bd60                _bsd__stop_set_sysinit_set
917[...]
918-------------------------------------------------------------------------------
919
920Here you can see, that some global data structures are collected into
921continuous memory areas.  This memory area can be identified by start and stop
922symbols.  This constructs a table of uniform items.
923
924The low level FreeBSD code calls at some time during the initialization the
925mi_startup() function (machine independent startup).  This function will sort
926the SYSINIT(9) set and call handler functions which perform further
927initialization.  The last step is the scheduler invocation.
928
929The SYSINIT(9) routines are run in mi_startup() which is called by
930rtems_bsd_initialize().
931
932This is also explained in "The Design and Implementation of the FreeBSD
933Operating System" section 14.3 "Kernel Initialization".
934
935In RTEMS we have a library and not a bunch of object files.  Thus we need a way
936to pull-in the desired services out of the libbsd.  Here the
937`rtems-bsd-sysinit.h` comes into play.  The SYSINIT(9) macros have been
938modified and extended for RTEMS in `<sys/kernel.h>`:
939
940-------------------------------------------------------------------------------
941#ifndef __rtems__
942#define C_SYSINIT(uniquifier, subsystem, order, func, ident)    \
943        static struct sysinit uniquifier ## _sys_init = {       \
944                subsystem,                                      \
945                order,                                          \
946                func,                                           \
947                (ident)                                         \
948        };                                                      \
949        DATA_SET(sysinit_set,uniquifier ## _sys_init)
950#else /* __rtems__ */
951#define SYSINIT_ENTRY_NAME(uniquifier)                          \
952        _bsd_ ## uniquifier ## _sys_init
953#define SYSINIT_REFERENCE_NAME(uniquifier)                      \
954        _bsd_ ## uniquifier ## _sys_init_ref
955#define C_SYSINIT(uniquifier, subsystem, order, func, ident)    \
956        struct sysinit SYSINIT_ENTRY_NAME(uniquifier) = {       \
957                subsystem,                                      \
958                order,                                          \
959                func,                                           \
960                (ident)                                         \
961        };                                                      \
962        RWDATA_SET(sysinit_set,SYSINIT_ENTRY_NAME(uniquifier))
963#define SYSINIT_REFERENCE(uniquifier)                           \
964        extern struct sysinit SYSINIT_ENTRY_NAME(uniquifier);   \
965        static struct sysinit const * const                     \
966        SYSINIT_REFERENCE_NAME(uniquifier) __used               \
967        = &SYSINIT_ENTRY_NAME(uniquifier)
968#define SYSINIT_MODULE_REFERENCE(mod)                           \
969        SYSINIT_REFERENCE(mod ## module)
970#define SYSINIT_DRIVER_REFERENCE(driver, bus)                   \
971        SYSINIT_MODULE_REFERENCE(driver ## _ ## bus)
972#define SYSINIT_DOMAIN_REFERENCE(dom)                           \
973        SYSINIT_REFERENCE(domain_add_ ## dom)
974#endif /* __rtems__ */
975-------------------------------------------------------------------------------
976
977Here you see that the SYSINIT(9) entries are no longer static.  The
978\*_REFERENCE() macros will create references to the corresponding modules which
979are later resolved by the linker.  The application has to provide an object
980file with references to all required FreeBSD modules.
981
982The FreeBSD device model is quite elaborated (with follow-ups):
983
984http://www.freebsd.org/cgi/man.cgi?query=driver
985
986The devices form a tree with the Nexus device at a high-level.  This Nexus
987device is architecture specific in FreeBSD.  In RTEMS we have our own Nexus
988device, see `rtemsbsd/bsp/bsp-bsd-nexus-devices.c`.
989
990=== SYSCTL_NODE Example
991
992During development, we had an undefined reference to
993_bsd_sysctl__net_children that we had trouble tracking down. Thanks to
994Chris Johns, we located it. He explained how to read SYSCTL_NODE
995definitions. This line from freebsd/netinet/in_proto.c is attempting
996to add the "inet" node to the parent node "_net".
997
998----
999SYSCTL_NODE(_net,      PF_INET,         inet,   CTLFLAG_RW, 0,
1000        "Internet Family");
1001----
1002
1003Our problem was that we could not find where _bsd_sysctl__net_children
1004was defined. Chris suggested that when in doubt compile with -save-temps
1005and look at the preprocessed .i files. But he did not need that. He
1006explained that this the symbol name _bsd_sysctl__net_children was
1007automatically generated by a SYSCTL_NODE as follows:
1008
1009* _bsd_ - added by RTEMS modifications to SYSCTL_NODE macro
1010* sysctl_ - boilerplace added by SYSCTL_NODE macro
1011* "" - empty string for parent node
1012* net - name of SYSCTL_NODE
1013* children - added by SYSCTL macros
1014
1015This was all generated by a support macro declaring the node as this:
1016
1017----
1018struct sysctl_oid_list SYSCTL_NODE_CHILDREN(parent, name);
1019----
1020
1021Given this information, we located this SYSCTL_NODE declaration in
1022kern/kern_mib.c
1023
1024----
1025SYSCTL_NODE(, CTL_KERN,   kern,   CTLFLAG_RW, 0,
1026        "High kernel, proc, limits &c");
1027----
1028
1029== Core FreeBSD APIs and RTEMS Replacements ==
1030
1031=== SX(9) (Shared/exclusive locks) ===
1032
1033http://www.freebsd.org/cgi/man.cgi?query=sx
1034
1035Binary semaphores (this neglects the ability to allow shared access).
1036
1037=== MUTEX(9) (Mutual exclusion) ===
1038
1039http://www.freebsd.org/cgi/man.cgi?query=mutex
1040
1041Binary semaphores (not recursive mutexes are not supported this way).
1042
1043=== RWLOCK(9) (Reader/writer lock) ===
1044
1045http://www.freebsd.org/cgi/man.cgi?query=rwlock
1046
1047POSIX r/w lock.
1048
1049=== RMLOCK(9) (Reader/writer lock optimized for mostly read access patterns) ===
1050
1051Note:  This object was implemented as a wrapper for RWLOCK in the rm_lock header file.
1052
1053http://www.freebsd.org/cgi/man.cgi?query=rmlock
1054
1055POSIX r/w lock.
1056
1057=== CONDVAR(9) (Condition variables) ===
1058
1059http://www.freebsd.org/cgi/man.cgi?query=condvar
1060
1061POSIX condition variables with modifications (hack).
1062
1063=== CALLOUT(9) (Timer functions) ===
1064
1065http://www.freebsd.org/cgi/man.cgi?query=callout
1066
1067Timer server.
1068
1069=== TASKQUEUE(9) (Asynchronous task execution) ===
1070
1071http://www.freebsd.org/cgi/man.cgi?query=taskqueue
1072
1073TBD.
1074
1075=== KTHREAD(9), KPROC(9) (Tasks) ===
1076
1077http://www.freebsd.org/cgi/man.cgi?query=kthread
1078
1079http://www.freebsd.org/cgi/man.cgi?query=kproc
1080
1081Tasks.
1082
1083=== ZONE(9) (Zone allocator) ===
1084
1085http://www.freebsd.org/cgi/man.cgi?query=zone
1086
1087TBD.
1088
1089=== devfs (Device file system) ===
1090
1091There is a minimal implementation based on IMFS. The mount point is fixed to
1092"/dev". Note that the devfs is only used by the cdev subsystem. cdev has been
1093adapted so that the full path (including the leading "/dev") is given to devfs.
1094This saves some copy operations.
1095
1096devfs_create() first creates the full path and then creates an IMFS generic node
1097for the device.
1098
1099TBD: remove empty paths on devfs_destroy().
1100
1101=== psignal (Signals) ===
1102
1103TBD.  Seems to be not needed.
1104
1105=== poll, select ===
1106
1107TBD.  Seems to be not needed.
1108
1109=== RMAN(9) (Resource management) ===
1110
1111http://www.freebsd.org/cgi/man.cgi?query=rman
1112
1113TBD.  Seems to be not needed.
1114
1115=== DEVCLASS(9), DEVICE(9), DRIVER(9), MAKE_DEV(9) (Device management) ===
1116
1117http://www.freebsd.org/cgi/man.cgi?query=devclass
1118
1119http://www.freebsd.org/cgi/man.cgi?query=device
1120
1121http://www.freebsd.org/cgi/man.cgi?query=driver
1122
1123http://www.freebsd.org/cgi/man.cgi?query=make_dev
1124
1125Use FreeBSD implementation as far as possible.  FreeBSD has a nice API for
1126dynamic device handling.  It may be interesting for RTEMS to use this API
1127internally in the future.
1128
1129=== BUS_SPACE(9), BUS_DMA(9) (Bus and DMA access) ===
1130
1131http://www.freebsd.org/cgi/man.cgi?query=bus_space
1132
1133http://www.freebsd.org/cgi/man.cgi?query=bus_dma
1134
1135Likely BSP dependent.  A default implementation for memory mapped linear access
1136is easy to provide.  The current heap implementation supports all properties
1137demanded by bus_dma (including the boundary constraint).
1138
1139== RTEMS Replacements by File Description ==
1140
1141Note:  Files with a status of USB are used by the USB test and have at least
1142been partially tested.  If they contain both USB and Nic, then they are used
1143by both and MAY contain methods that have not been tested yet.  Files that
1144are only used by the Nic test are the most suspect.
1145
1146----
1147rtems-libbsd File:      rtems-bsd-assert.c
1148FreeBSD File:           rtems-bsd-config.h redefines BSD_ASSERT.
1149Description:            This file contains the support method rtems_bsd_assert_func().
1150Status:                 USB, Nic
1151
1152rtems-libbsd File:      rtems-bsd-autoconf.c
1153FreeBSD File:           FreeBSD has BSP specific autoconf.c
1154Description:            This file contains configuration methods that are used to setup the system.
1155Status:                 USB
1156
1157rtems-libbsd File:      rtems-bsd-bus-dma.c
1158FreeBSD File:           FreeBSD has BSP specific busdma_machdep.c
1159Description:
1160Status:                 USB, Nic
1161
1162rtems-libbsd File:      rtems-bsd-bus-dma-mbuf.c
1163FreeBSD File:           FreeBSD has BSP specific busdma_machdep.c
1164Description:
1165Status:                 Nic
1166
1167rtems-libbsd File:      rtems-bsd-callout.c
1168FreeBSD File:           kern/kern_timeout.c
1169Description:
1170Status:                 USB, Nic
1171
1172rtems-libbsd File:      rtems-bsd-cam.c
1173FreeBSD File:           cam/cam_sim.c
1174Description:
1175Status:                 USB
1176
1177rtems-libbsd File:      rtems-bsd-condvar.c
1178FreeBSD File:           kern/kern_condvar.c
1179Description:
1180Status:                 USB
1181
1182rtems-libbsd File:      rtems-bsd-copyinout.c
1183FreeBSD File:           bsp specific copyinout.c )
1184Description:            Note: The FreeBSD file is split with some methods being in rtems-bsd-support
1185Status:                 Nic
1186
1187rtems-libbsd File:      rtems-bsd-delay.c
1188FreeBSD File:           bsp specific file with multiple names
1189Description:
1190Status:                 USB, Nic
1191
1192rtems-libbsd File:      rtems-bsd-descrip.c
1193FreeBSD File:           kern/kern_descrip.c
1194Description:
1195Status:                 Nic
1196
1197rtems-libbsd File:      rtems-bsd-generic.c
1198FreeBSD File:           kern/sys_generic.c
1199Description:
1200Status:                 Nic
1201
1202rtems-libbsd File:      rtems-bsd-init.c
1203FreeBSD File:           N/A
1204Description:
1205Status:                 USB, Nic
1206
1207rtems-libbsd File:      rtems-bsd-init-with-irq.c
1208FreeBSD File:           N/A
1209Description:
1210Status:                 USB, Nic
1211
1212rtems-libbsd File:      rtems-bsd-jail.c
1213FreeBSD File:           kern/kern_jail.c
1214Description:
1215Status:                 USB, Nic
1216
1217rtems-libbsd File:      rtems-bsd-lock.c
1218FreeBSD File:           kern/subr_lock.c
1219Description:
1220Status:                 USB, Nic
1221
1222rtems-libbsd File:      rtems-bsd-log.c
1223FreeBSD File:           kern/subr_prf.c
1224Description:
1225Status:                 Nic
1226
1227rtems-libbsd File:      rtems-bsd-malloc.c
1228FreeBSD File:           kern/kern_malloc.c
1229Description:
1230Status:                 USB, Nic
1231
1232rtems-libbsd File:      rtems-bsd-mutex.c
1233FreeBSD File:           kern/kern_mutex.c
1234Description:
1235Status:                 USB, Nic
1236
1237rtems-libbsd File:      rtems-bsd-newproc.c
1238FreeBSD File:           N/A
1239Description:
1240Status:                 Nic
1241
1242rtems-libbsd File:      rtems-bsd-nexus.c
1243FreeBSD File:           bsp specific nexus.c
1244Description:
1245Status:                 USB
1246
1247rtems-libbsd File:      rtems-bsd-panic.c
1248FreeBSD File:           boot/common/panic.c
1249Description:
1250Status:                 USB, Nic
1251
1252rtems-libbsd File:      rtems-bsd-rwlock.c
1253FreeBSD File:           kern_rwlock.c
1254Description:
1255Status:                 USB, Nic
1256
1257rtems-libbsd File:      rtems-bsd-shell.c
1258FreeBSD File:           N/A
1259Description:
1260Status:                 USB
1261
1262rtems-libbsd File:      rtems-bsd-signal.c
1263FreeBSD File:           kern/kern_sig.c
1264Description:
1265Status:                 Nic
1266
1267rtems-libbsd File:      rtems-bsd-smp.c
1268FreeBSD File:           N/A
1269Description:
1270Status:                 Nic
1271
1272rtems-libbsd File:      rtems-bsd-support.c
1273FreeBSD File:           bsp specific copyinout.c
1274Description:            Note: the FreeBSD file is split with some methods being in rtems-bsd-copyinout.
1275Status:                 USB, Nic
1276
1277rtems-libbsd File:      rtems-bsd-sx.c
1278FreeBSD File:           kern/kern_sx.c
1279Description:            Status: USB, Nic
1280
1281rtems-libbsd File:      rtems-bsd-synch.c
1282FreeBSD File:           kern/kern_synch.c
1283Description:
1284Status:                 USB, Nic
1285
1286rtems-libbsd File:      rtems-bsd-syscalls.c
1287FreeBSD File:           User API for kern/uipc_syscalls.c
1288Description:
1289Status:                 Nic
1290
1291rtems-libbsd File:      rtems-bsd-sysctlbyname.c
1292FreeBSD File:           User API for sysctlbyname(3)
1293Description:
1294Status:
1295
1296rtems-libbsd File:      rtems-bsd-sysctl.c
1297FreeBSD File:           User API for sysctl(8)
1298Description:
1299Status:
1300
1301rtems-libbsd File:      rtems-bsd-sysctlnametomib.c
1302FreeBSD File:           User API for sysctlnametomib
1303Description:
1304Status:
1305
1306rtems-libbsd File:      rtems-bsd-taskqueue.c
1307FreeBSD File:           kern/subr_taskqueue.c
1308Description:
1309Status:                 Nic
1310
1311rtems-libbsd File:      rtems-bsd-thread.c
1312FreeBSD File:           kern/kern_kthread.c
1313Description:
1314Status:                 USB, Nic
1315
1316rtems-libbsd File:      rtems-bsd-timeout.c
1317FreeBSD File:           kern/kern_timeout.c
1318Description:
1319Status:                 Nic
1320
1321rtems-libbsd File:      rtems-bsd-timesupport.c
1322FreeBSD File:           kern/kern_clock.c
1323Description:
1324Status:                 Nic
1325
1326rtems-libbsd File:      rtems-bsd-vm_glue.c
1327FreeBSD File:           vm/vm_glue.c
1328Description:
1329Status:                 USB, Nic
1330----
1331
1332== Notes by File ==
1333
1334altq_subr.c - Arbitrary choices were made in this file that RTEMS would
1335not support tsc frequency change.  Additionally, the clock frequency
1336for machclk_freq is always measured for RTEMS.
1337
1338conf.h - In order to add make_dev and destroy_dev, variables in the cdev
1339structure that were not being used were conditionally compiled out. The
1340capability of supporting children did not appear to be needed and was
1341not implemented in the rtems version of these routines.
1342
1343== NICs Status ==
1344
1345----
1346Driver                  Symbol                          Status
1347======                  ======                          ======
1348RealTek                 _bsd_re_pcimodule_sys_init      Links
1349EtherExpress            _bsd_fxp_pcimodule_sys_init     Links
1350DEC tulip               _bsd_dc_pcimodule_sys_init      Links
1351Broadcom BCM57xxx       _bsd_bce_pcimodule_sys_init     Links
1352Broadcom BCM4401        _bsd_bfe_pcimodule_sys_init     Links
1353Broadcom BCM570x        _bsd_bge_pcimodule_sys_init     Needs Symbols (A)
1354E1000 IGB               _bsd_igb_pcimodule_sys_init     Links
1355E1000 EM                _bsd_em_pcimodule_sys_init      Links
1356Cadence                 ?                               Links, works.
1357----
1358
1359To add a NIC edit rtemsbsd/include/bsp/nexus-devices.h and add the driver
1360reference to the architecture and/or BSP. For example to add the RealTek driver
1361add:
1362
1363SYSINIT_DRIVER_REFERENCE(re, pci);
1364
1365and to add the MII PHY driver add:
1366
1367SYSINIT_DRIVER_REFERENCE(rge, miibus);
1368
1369The PC BSP has these entries.
1370
1371Symbols (A)
1372         pci_get_vpd_ident
1373
1374=== Cadence ===
1375
1376The cadence driver works on the Xilinx Zynq platform. The hardware checksum
1377support works on real hardware but does not seem to be supported on qemu
1378therefore the default state is to disable TXCSUM and RXCSUM and this can be
1379enabled from the shell with:
1380
1381  # ifconfig cgem0 rxcsum txcsum
1382
1383or with an ioctl call to the network interface driver with SIOCSIFCAP and the
1384mask IFCAP_TXCSUM and IFCAP_RXCSUM set.
1385
1386== PF (Firewall) ==
1387
1388It is possible to use PF as a firewall. See
1389[https://www.freebsd.org/doc/handbook/firewalls-pf.html] for details on the
1390range of functions and for how to configure the firewall.
1391
1392The following is necessary to use PF on RTEMS:
1393
1394- You have to provide a +/etc/pf.os+ file. The firewall can use it for passive
1395  OS fingerprinting. If you don't want to use this feature, the file may contain
1396  nothing except a line of comment (for example "# empty").
1397
1398- If some filters use protocol names (like tcp or udp) you have to provide a
1399  +/etc/protocols+ file.
1400
1401- If some filters use service names (like ssh or http) you have to provide a
1402  +/etc/services+ file.
1403
1404- Create a rule file (normally +/etc/pf.conf+). See the FreeBSD manual for the
1405  syntax.
1406
1407- Load the rule file using the pfctl command and enable pf. Please note that the
1408  pfctl command needs a lot of stack. You should use at least
1409  RTEMS_MINIMUM_STACK_SIZE + 8192 Bytes of stack. An example initialisation can
1410  look like follows:
1411
1412----
1413        int exit_code;
1414        char *params[] = {
1415                "pfctl",
1416                "-f",
1417                "/etc/pf.conf",
1418                "-e",
1419                NULL
1420        };
1421
1422        exit_code = rtems_bsd_command_pfctl(ARGC(params), params);
1423        assert(exit_code == EXIT_SUCCSESS);
1424----
1425
1426=== Known restrictions ===
1427
1428- Currently PF on RTEMS always uses the configuration for memory restricted
1429  systems (on FreeBSD that means systems with less than 100 MB RAM). This is
1430  fixed in +pfctl_init_options()+.
1431
1432== Problems to report to FreeBSD ==
1433
1434The MMAP_NOT_AVAILABLE define is inverted on its usage.  When it is
1435defined the mmap method is called. Additionally, it is not used
1436thoroughly. It is not used in the unmap portion of the source.
1437The file rec_open.c uses the define MMAP_NOT_AVAILABLE to wrap
1438the call to mmap and file rec_close.c uses the munmap method.
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