Read/Write x86 Registers

[FunnyGuy9796]

I am currently implementing APIC but have come across a minor issue where I cannot quite figure out how to read or write to registers. I know this is a basic question but I just can't figure it out.

[devc1]

this is how you setup the apic : https://wiki.osdev.org/APIC

after that, you will have the physical lapic address that you can just read/write to like normal RAM.

[Octocontrabass]

I am currently implementing APIC but have come across a minor issue where I cannot quite figure out how to read or write to registers.

Which registers are you talking about? There are a lot of those!

If you mean the APIC registers, by default they're ordinary MMIO. The ACPI MADT will tell you the address. If you enable x2APIC mode, they're MSRs instead, and you can access them using RDMSR and WRMSR.