Hi,
I would write a simple program for Xen which print I simple 
message 
on the screen. I wrote an assembler procedure to print an 
helloworld message:
 .text
 .globl _start
_start:
 cld
# 
from include/asm-xeno/hypervisor.h
 movl 2,ドル%eax 
#__HYPERVISOR_console_write (include/asm-xeno/hypervisor-
ifs/hypervisor-
if.h)
 movl $hello_message,%ebx # arg1 = buffer 
virtual address
 movl $hello_message_len,%ecx # arg2 = buffer length
 int 0ドルx82
# from include/asm-xeno/hypervisor.h
 movl 8,ドル%eax # 
__HYPERVISOR_sched_op
 movl 1,ドル%ebx # SCHEDOP_exit
 int 0ドルx82
hang: 
 jmp hang # shouldn't get here
hello_message: .ascii "This is 
the hello world program\n"
 hello_message_len = . - hello_message
The Xen loader also wants a 12-byte header on the image file. So I 
wrote a little assembler module (xenoguestheader.s) to handle that: 
 .text
 .globl _start
_start:
 .ascii "XenoGues" # 
read_kernel_header (tools/xc/lib/xc_linux_build.c)
 .long _start # - 
the kernel's load address
The final image has to consist of the 12-
bytes object code from xenoguestheader.s followed the object code from 
helloworld.s. Here is my makefile to accomplish that: 
helloworld.gz: 
helloworld.s xenoguestheader.raw
 as -o helloworld.o -a=helloworld.l 
helloworld.s
 ld -Ttext 0x100000 -o helloworld.elf helloworld.o
 
objcopy -O binary -S -g helloworld.elf helloworld.raw
 cat 
xenoguestheader.raw helloworld.raw | gzip > helloworld.gz
xenoguestheader.raw: xenoguestheader.s
 as -o xenoguestheader.o 
xenoguestheader.s
 ld -Ttext 0x100000 -o xenoguestheader 
xenoguestheader.o
 objcopy -O binary -S -g xenoguestheader 
xenoguestheader.raw
This makefile produce a helloworld.elf file. The 
problem is to write a config 
file which run this program. I would call 
th command:
xm create -c <config_file>
and to see the message on the 
screen. I wrote this option in the config file:
kernel = "helloworld.
elf"
memory = 32
name = "HelloWorld"
on_crash = 'destroy'
but when I 
run this command, I read this message on the screen;
Error: (22, 
'Invalid argument')
HELP ME, PLEASE!
_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel