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fix(riscv/imsic): read the right CSR register in imsic_get_pend() #213

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fix(riscv/imsic): read the right CSR register in imsic_get_pend() #213

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SISELECT CSR is used for specifying the register that will be accessed by SIREG CSR.
Reading the SISELECT CSR returns the offset of that register instead of its value. SIREG is required for that purpose.

@filippofontana
fix(riscv/imsic): read the right CSR register in imsic_get_pend()
7c16304 
SISELECT CSR is used for specifying the register that will be accessed
by SIREG CSR.
Reading the SISELECT CSR returns the offset of that register instead of
its value. SIREG is required for that purpose.

Signed-off-by: Filippo Fontana <filippo.fontana@minervasys.tech>
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