Hamiltonian of the Half Harmonic Oscillator

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Raxonan
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Given the half harmonic potential:

\begin{equation}V=\begin{cases}1/2\omega^2mx^2 & x > 0\\\infty & x < 0\end{cases}\end{equation}What will be the Hamiltonian of the half oscillator?I understand that for x>0 the Hamiltonian will be:

\begin{equation}H=\frac{1}{2}\omega^2mx^2+\frac{P^2}{2m}\end{equation}

But how do I find the Hamiltonian for the part when V = ∞?
 
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The infinite potential simply constrains the particle to the region x > 0. The wave-equation for x < 0 must be 0. I can't see how you could define a Hamiltonian for this.