using bit-field to define a qom register

[Hiroko Shimizu]

Hello,

I would like to access a 4byte-register in 1bit unit.

So, I was supposed to use a bit field to define a register like this.

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typedef struct register{

    // define register B

    uint32_t B1 : 1;

    uint32_t B2 : 1;

    uint32_t B3 : 30;

}register;

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Then, How do you define this in VMStateDescription? 

And can I set a value to register.B2 from the ***_write function? 

Best regards,

Hiroko