This is unexpected poweroff. I just translated next stuff from /grub-sources/stage2/asm.S:
ENTRY(real_to_prot)
.code16
cli
/* load the GDT register */
DATA32 ADDR32 lgdt gdtdesc
/* turn on protected mode */
movl %cr0, %eax
orl $CR0_PE_ON, %eax
movl %eax, %cr0
/* jump to relocation, flush prefetch queue, and reload %cs */
DATA32 ljmp $PROT_MODE_CSEG, $protcseg
/*
* The ".code32" directive only works in GAS, the GNU assembler!
* This gets out of "16-bit" mode.
*/
.code32
protcseg:
/* reload other segment registers */
movw $PROT_MODE_DSEG, %ax
movw %ax, %ds
movw %ax, %es
movw %ax, %fs
movw %ax, %gs
movw %ax, %ss
/* put the return address in a known safe location */
movl (%esp), %eax
movl %eax, STACKOFF
/* get protected mode stack */
movl protstack, %eax
movl %eax, %esp
movl %eax, %ebp
/* get return address onto the right stack */
movl STACKOFF, %eax
movl %eax, (%esp)
/* zero %eax */
xorl %eax, %eax
/* return on the old (or initialized) stack! */
ret
ENTRY(prot_to_real)
/* just in case, set GDT */
lgdt gdtdesc
/* save the protected mode stack */
movl %esp, %eax
movl %eax, protstack
/* get the return address */
movl (%esp), %eax
movl %eax, STACKOFF
/* set up new stack */
movl $STACKOFF, %eax
movl %eax, %esp
movl %eax, %ebp
/* set up segment limits */
movw $PSEUDO_RM_DSEG, %ax
movw %ax, %ds
movw %ax, %es
movw %ax, %fs
movw %ax, %gs
movw %ax, %ss
/* this might be an extra step */
ljmp $PSEUDO_RM_CSEG, $tmpcseg /* jump to a 16 bit segment */
tmpcseg:
.code16
/* clear the PE bit of CR0 */
movl %cr0, %eax
andl $CR0_PE_OFF, %eax
movl %eax, %cr0
/* flush prefetch queue, reload %cs */
DATA32 ljmp $0, $realcseg
realcseg:
/* we are in real mode now
* set up the real mode segment registers : DS, SS, ES
*/
/* zero %eax */
xorl %eax, %eax
movw %ax, %ds
movw %ax, %es
movw %ax, %fs
movw %ax, %gs
movw %ax, %ss
/* restore interrupts */
sti
/* return on new stack! */
DATA32 ret
.code32
Now need to understand what realy happened.
Best regards from airstep.
poweroff.patch
Description: Binary data
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