riscv: define marchid using CSR macros #232
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Adds a variant arm to the read-only CSR helper macro to create a CSR register type which may not be implemented on the platform. Takes a sentinel value to test whether the CSR is implemented.
Uses CSR helper macros to define the `marchid` register.
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Adds a helper macro to test if a CSR is implemented on the platform.
Uses CSR helper macros to define the
marchidregister.Related: #229