-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Luca Falavigna ha scritto: > Eric W. Biederman ha scritto: > >>>Anyway I believe you also want to look at include/linux/tty.h >>>at the screen_info structure. I believe that is where >>>all of that information is passed. > > I noticed. Maybe if we fill struct x86_linux_param_header with some values > obtained from struct screen_info, we should be able to "score that mid-court > prayer" ;) > I tried to implement a new ioctl command in fb_ioctl() in order to retrieve and store screen_info variables into struct x86_linux_param_header, but I got the same result: no messages shown in console, as I supposed. After that I looked at video.S, especially an interesting label called "video":
# This is the main entry point called by setup.S # %ds *must* be pointing to the bootsector video: pushw %ds # We use different segments pushw %ds # FS contains original DS popw %fs [...] #ifdef CONFIG_VIDEO_SELECT movw %fs:(0x01fa), %ax # User selected video mode cmpw $ASK_VGA, %ax # Bring up the menu jz vid2 [...] Video mode is stored (by bootloader, actually) at offset 0x01fa from a given boot sector, which should be located at physical address DEF_SETUPSEG (0x9020). Feel free to correct me if I'm wrong. If we could store current video mode before executing reboot_code_buffer, probably setup() function would take care of anything else. So we could implement a function (or an assembly stub) in machine_kexec which does this job. I think this is the best (and safest) solution. Regards, - -- Luca -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org iQEVAwUBQvzwDczkDT3RfMB6AQJlQAf+INkCMjhmm18RPCMHXij7WmOL/4TCKTc8 fZCf+IzhsSUxwkfYmUbTfXtJ/xCxIyRh5gBGirB9n/s9NzOiYwmcQWMrn7DbWpWu YBVkTdz3W3Y0dA08baIYQ8u51gJvnVMuGJEFqsLxPx+gzHJOETEGkzhuyUuPk+J+ N4OkSyTGYt5zXZmyVzV7KZ8XLrfX3XvRLV3m2aey0Hz4jcf8sIozANokDRdG3MpN 7F0Z4yL1EnMI4oijHSDLeqbycAg8iYa49P45EO6+jzuRH2i2bnq8hOvBHa0+B01Q Gr0Ljd+DJ2jNVO4ecqbWC9oFxBFXsRN+ThAxsYEbWDGIrJdAa32mfA== =BztK -----END PGP SIGNATURE----- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/