[okl4-developer] Using an iguana server from wombat HowTo

[Jorge Torres]

Hi,

About the previuos e-mail, I think this last is not necessary:
*Comment line on linux/kernel-../arch/l4/Makefile the one that says: include
$(KBUILD_SRC)/$(ARCH_DIR)/sys-$(SYSTEM)/Makefile
cp linux/kernel-../l4linux_config_<arch> linux/kernel/.config
make menuconfig
*Uncomment commented line  of linux/kernel/arch/l4/Makefile
rm linux/kernel/.config*

All the best,

Jorge

On Tue, Apr 8, 2008 at 8:40 PM, Jorge Torres <
jorge.torres.maldonado at gmail.com> wrote:

> Hi,
>
> I dont know what would be the best way for doing this, I've also done this
> as follows:
>
> *Adding driver at:
> linux/kernel-2.6.11-v2/arch/l4/drivers/hello.c
>
> *at linux/kernel-2.6.11-v2/arch/l4/drivers/Makefile:
>
> obj-$(CONFIG_HELLO) += hello.o
>
> *at linux/kernel-2.6.11-v2/arch/l4/Kconfig:
>
> menu "HELLO"
>
> config HELLO
>     bool "add hello"
>     default y
> endmenu
>
>
>
> Hope it helps,
>
> Cheers,
>
> Jorge
>
>
> On Mon, Mar 31, 2008 at 12:31 PM, Remy Gottschalk <
> rgottschalk at linagora.com> wrote:
>
> > Hi again
> >
> > This howto directly follows the previous one (HelloWorld Iguana server
> > HowTo) and explain how interacting with the helloworld server from
> > wombat.
> > The next will probably deal with more elaborate communication and shared
> > memory.
> >
> >
> > ----------------------------
> > Using the server from Wombat
> > ----------------------------
> >
> > Now we have a functional hello server we will use it from the
> > para-virtualized Linux. We will do so using a new entry in /proc.
> >
> >  1 Library
> >  ---------
> >
> > The first thing to do is to link the kernel to our client library
> > libhello.a. To achieve this we simply add a -lhello flag to the kernel
> > Makefile.
> >
> > $ cat linux/kernel-2.6.11-v2/arch/l4/Makefile
> > [...]
> > libs-y +=  -lvtimer -lvserial -ll4e -lll -liguana -ll4 -lgcc -lmutex
> > -lcircular_buffer -lnaming -lhello
> > [...]
> >
> >  2 A new module
> >  --------------
> >
> > We will now create a new kernel module to allow use interacting with the
> > server using a /proc entry.
> > We will work directly in a hello folder in the kernel root in order to
> > make things fast and easy.
> >
> > $ mkdir linux/kernel-2.6.11-v2/hello
> > $ touch linux/kernel-2.6.11-v2/hello/Makefile
> > $ touch linux/kernel-2.6.11-v2/hello/my_l4_hello.c
> > $ ls  linux/kernel-2.6.11-v2/hello
> > Makefile  my_l4_hello.c
> >
> > We need to modify the global Makefile :
> > $ cat linux/kernel-2.6.11-v2/Makefile
> > [...]
> > core-y          := usr/ hello/
> > [...]
> > and create a new one for our source file.
> > $ cat linux/kernel-2.6.11-v2/hello/Makefile
> > obj-y += my_l4_hello.o
> >
> > Now here is the code for our module :
> >
> > $ cat linux/kernel-2.6.11-v2/hello/my_l4_hello.c
> > #include <linux/module.h>
> > #include <linux/kernel.h>
> > #include <linux/proc_fs.h>
> > #include <linux/string.h>
> > #include <linux/vmalloc.h>
> > #include <asm/uaccess.h>
> >
> > #include <hello/hello.h>
> >
> > /* Defines the license for this LKM */
> > MODULE_LICENSE("GPL");
> > MODULE_DESCRIPTION("L4 Hello Wrapper");
> >
> > static struct proc_dir_entry *proc_entry;
> >
> > int hello_read( char *page, char **start, off_t off,
> >                  int count, int *eof, void *data )
> > {
> >  say_hello();
> >  return 0;
> > }
> >
> > int my_module_init( void )
> > {
> >  int ret = 0;
> >
> >  proc_entry = create_proc_entry( "hello", 0644, NULL );
> >  if (proc_entry == NULL)
> >    {
> >      ret = -ENOMEM;
> >      printk(KERN_INFO "fortune: Couldn't create proc entry\n");
> >    }
> >  else
> >    {
> >      proc_entry->read_proc = hello_read;
> >      proc_entry->write_proc = hello_write;
> >      proc_entry->owner = THIS_MODULE;
> >      printk(KERN_INFO "<===== Hello Module Started =====>\n");
> >    }
> >  hello_init();
> >  return ret;
> > }
> >
> > void my_module_cleanup( void )
> > {
> >  remove_proc_entry("hello", &proc_root);
> >  printk(KERN_INFO "<===== Hello Module Unloaded =====>\n");
> >  return;
> > }
> >
> > module_init( my_module_init );
> > module_exit( my_module_cleanup );
> >
> > This module creates a new entry in /proc (/proc/hello) and calls
> > say_hello
> > on each reading access.
> >
> > We can see that using our server is pretty simple, three line are
> > concerned :
> > #include <hello/hello.h>
> > To include user library headers
> > hello_init();
> > In order to initiate the communication.
> > say_hello();
> > To interact with our server.
> >
> >  3 Final test
> >  ------------
> >
> > We compile and test :
> >
> > $ ./tools/build.py machine=ia32_pc99 project=iguana wombat=True
> > toolprefix=i686-unknown-linux-gnu- simulate
> > [...]
> > <===== Hello Module Started =====>
> > [...]
> > <===== Hello Server Started =====>
> > [...]
> > Please press Enter to activate this console.
> >
> > BusyBox v1.00 (2008.03.28-14:47+0000) Built-in shell (ash)
> > Enter 'help' for a list of built-in commands.
> >
> > / #  cat /proc/hello
> > I say hello
> > / #
> >
> >
> >
> >
> >
> >
> > --
> > Remy Gottschalk - rgottschalk at linagora.com
> > Ingénieur informatique embarquée
> > Groupe LINAGORA - http://www.linagora.com
> > Tél.: +33(0)1 58 18 68 28 - Fax : +33(0)1 58 18 68 29
> >
> >
> >
> > _______________________________________________
> > Developer mailing list
> > Developer at okl4.org
> > https://lists.okl4.org/mailman/listinfo/developer
> >
>
>
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