Messages in this thread | | | Subject | Re: [2.4][2.5][Trivial Patch] Bug in i386/kernel/process.c? | From | Disconnect <> | Date | 04 Jul 2003 12:40:04 -0400 |
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Er, that patch won't apply to 2.5 - the code is the same, but its moved to reboot.c.
Same change, diff't file/offset.
On Thu, 2003-07-03 at 12:26, Disconnect wrote: > I was poking into how to force a warm boot (found it easily enough) and > started reading process.c, where the details live. > > We have: > static int reboot_mode; > int reboot_thru_bios; > > static int __init reboot_setup(char *str) > { > ...set reboot_mode/reboot_thru_bios according to reboot=... > } > __setup("reboot=", reboot_setup); > > Farther down: > /* Write 0x1234 to absolute memory location 0x472. The BIOS > reads > this on booting to tell it to "Bypass memory test (also warm > boot)". This seems like a fairly standard thing that gets > set by > REBOOT.COM programs, and the previous reset routine did this > too. */ > > *((unsigned short *)0x472) = reboot_mode; > (similar code farther down in !reboot_thru_bios) > > ....but reboot_mode doesn't seem to be initialized if you don't set it > via reboot=...? (Same for reboot_thru_bios) > > A simple patch to use the defaults (according to the code comments) is > below; if this is right please push accordingly: > > Its against 2.4 but should apply to 2.5 as well. > --- build-dis5-final/arch/i386/kernel/process.c.orig 2003-07-03 12:15:36.000000000 -0400 > +++ build-dis5-final/arch/i386/kernel/process.c 2003-07-03 12:16:46.000000000 -0400 > @@ -152,8 +152,8 @@ > __setup("idle=", idle_setup); > > static long no_idt[2]; > -static int reboot_mode; > -int reboot_thru_bios; > +static int reboot_mode = 0x1234; > +int reboot_thru_bios = 1; > > #ifdef CONFIG_SMP > int reboot_smp = 0; -- Disconnect <lkml@sigkill.net>
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