> > Perhaps I have to turn off MMU while copying pagedir_nosave, and turn
> > on later?
>
> That sounds right.
I tried turning off MMU when copying pagedir_nosave, but OSK target
board hanged up just after MMU was turned off.
What I did was:
* invalidate cache
* invalidate write buffer
* invalidate TLB
* disable cache
* disable MMU
I have to investigate more on how to turn off MMU on ARM...
Below are actual insn:
mcr p15, 0, r0, c7, c7, 0 @ invalidate cache
mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
mcr p15, 0, r0, c8, c7, 0 @ invalidate TLB
mrc p15, 0, r0, c1, c0, 0 @ get control register
bic r1, r0, #0x0000100d @ disable cache and MMU
mcr p15, 0, r1, c1, c0, 0 @ set control register
nop <--- place where hanged up
Besides that, I must convert mem from virt to phys if I go with MMU off.
In kernel area, VIRT_TO_PHYS could be like this:
#define VIRT_TO_PHYS(x) \
sub x, x, # PAGE_OFFSET + PHYS_OFFSET
but could this also be used against hibernated image?
# sorry for late reply.
Regards,
HK.
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