Construct a register class from previously got `u64` value?

[zhouhaoan]

I got a u64 register value from get() method. But when I want to parse the value to get specify fields, I can't use those API in the crate. Moreover, it seems that register modules and structs doesn't implement From<u64> trait. Are there some way to parse previously read values? Or just get values and read fields from raw registers?

[vbe0201]

You could use the read() method on Field instances to extract bitfields out of raw integer values:

use aarch64_cpu::registers::*;

// Read the value of the register once
let esr = ESR_EL1.get();

// Extract fields from the `u64`
let ec = ESR_EL1::EC.read(esr);
let iss = ESR_EL1::ISS.read(esr);

[nchong-at-aws]

Closing as I think vbe0201's answer is what you need. Please reopen if that's not the case.