Re: [Qemu-devel] qemu static elf boot

[Nicolas Ollinger]

Hi,

> A static ELF loader would be easy to add, but I don't know what is the
> standard way to pass command line parameters to an OS. I agree that it
> is an important feature. Do you have images of a complete netbsd system
> (kernel with serial console + small disk image) ?

I put a small disk image, kernels, and some files and instructions to use
them under bochs (for comparison purpose) at the following URL:

http://www.ens-lyon.fr/~nollinge/netbsd_bochs/

It works under bochs but it is quite slow (PII/333 here).

Concerning the boot process, I think the following files are worth
reading, even if they are very NetBSD involved:

http://cvsweb.netbsd.org/bsdweb.cgi/src/sys/arch/i386/stand/boot/boot2.c?rev=1.1&content-type=text/x-cvsweb-markup
http://cvsweb.netbsd.org/bsdweb.cgi/src/sys/arch/i386/stand/lib/exec.c?rev=1.18&content-type=text/x-cvsweb-markup
http://cvsweb.netbsd.org/bsdweb.cgi/src/sys/lib/libsa/loadfile.c?rev=1.7.4.2&content-type=text/x-cvsweb-markup
http://cvsweb.netbsd.org/bsdweb.cgi/src/sys/arch/i386/stand/lib/startprog.S?rev=1.3&content-type=text/x-cvsweb-markup

=> [bootit] calls [exec_netbsd] calls [loadfile] calls [startprog].

Some involved headers:

http://cvsweb.netbsd.org/bsdweb.cgi/src/sys/sys/reboot.h?rev=1.20&content-type=text/x-cvsweb-markup
http://cvsweb.netbsd.org/bsdweb.cgi/src/sys/sys/boot_flag.h?rev=1.3&content-type=text/x-cvsweb-markup
http://cvsweb.netbsd.org/bsdweb.cgi/src/sys/arch/i386/stand/lib/bootinfo.h?rev=1.5&content-type=text/x-cvsweb-markup

A more general source of information concerning multi-OS booting would be
a complex bootloader like GRUB.

Nicolas.
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