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- `ArcBootDeviceName`: Given a theoretically valid ARC boot path
of the form:
`multi(0)disk(0)rdisk(0)partition(2)ReactOS\\weird)name`
correctly determine `ArcBootDeviceName` to be:
`multi(0)disk(0)rdisk(0)partition(2)`
and `SystemRoot` to be what follows it:
`ReactOS\\weird)name`
Usual paths like: `multi(0)disk(0)rdisk(0)partition(2)\\ReactOS`
are still correctly handled, of course.
- The `ArcHalDeviceName` path is the ARC path to the system partition,
where the firmware started the bootloader from. For historical reasons
it's called Arc **HAL**, because on older (and non-x86) Windows versions
the HAL was to be placed next to the OS loader in the system partition,
while the rest of the OS (kernel, etc.) was placed elsewhere.
So, in order to correctly set `ArcHalDeviceName`, pass the determined
SystemPartition all the way down to `WinLdrInitializePhase1()`.