Sorry for the longish To list, not sure who's responsible for this
particular piece. (And if I got it wrong even after all that, please let
me know..)
This is for 2.4; in 2.5 reboot.c has identical code with an identical
problem. (I'll send a separate patch after getting feedback on this
one.)
If you don't pass reboot=, reboot_mode and reboot_thru_bios are used
uninitialized and (in the case of reboot_mode) written directly to
memory for the bios.
This patch sets reboot_mode to 0x1234 by default, and reboot_thru_bios
(used in "if(!reboot_thru_bios)") to 1.
void machine_restart(char * __unused)
{
..[smp shutdown]..
if(!reboot_thru_bios) {
/* rebooting needs to touch the page at absolute addr 0 */
*((unsigned short *)__va(0x472)) = reboot_mode;
...
machine_real_restart(jump_to_bios, sizeof(jump_to_bios));
}
void machine_real_restart(unsigned char *code, int length)
{
.....
/* 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;
...
}
-- Disconnect <lkml@sigkill.net>
# This is a BitKeeper generated patch for the following project: # Project Name: Linux kernel tree # This patch format is intended for GNU patch command version 2.5 or higher. # This patch includes the following deltas: # ChangeSet 1.1042 -> 1.1043 # arch/i386/kernel/process.c 1.14 -> 1.15 # # The following is the BitKeeper ChangeSet Log # -------------------------------------------- # 03/07/07 dis@slappy.(none) 1.1043 # Initialize reboot_mode to defaults (according to comments) even if reboot= is lacking. Ditto for reboot_thru_bios. # (Warm boot, use bios.) # -------------------------------------------- # diff -Nru a/arch/i386/kernel/process.c b/arch/i386/kernel/process.c --- a/arch/i386/kernel/process.c Mon Jul 7 11:42:50 2003 +++ b/arch/i386/kernel/process.c Mon Jul 7 11:42:50 2003 @@ -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;
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This archive was generated by hypermail 2b29 : Mon Jul 07 2003 - 22:00:29 EST