There is also a form of mtmsr where all bits need to be
addressed. While the
PPC64 Linux kernel behaves resonably well here, the PPC32 one
never uses the
L=1 form but does mtmsr even for simple things like only changing
EE.
You make it sound like the 32-bit kernel does something stupid, while
there is no other choice. The "L=1" thing only exists for 64-bit.
Oh, so that's why :). That doesn't really change the fact that it's
very hard to distinguish between a mtmsr that only changes MSR_EE
vs one that changes MSR_IR for example :).
Hard to predict for the CPU as well, guess why there is a separate
instruction now :-P
By the way, L=1 _does_ exist for mtmsr; it's just that no 32-bit
"classic"
implementations support it.
Segher
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