maint: split peripheral drivers into bsp packages

kernel/arch/riscv64/src/lib.rs

@@ -44,6 +44,7 @@ pub struct PerCpuData {
 }
 
 pub static CPU_COUNT: AtomicUsize = AtomicUsize::new(1);
+pub static mut BOOT_HART_ID: u64 = 0;
 static IPI_QUEUES: OneTimeInit<Vec<IpiQueue<ArchitectureImpl>>> = OneTimeInit::new();
 static HART_TO_QUEUE: IrqSafeSpinlock<ArchitectureImpl, BTreeMap<u32, usize>> =
     IrqSafeSpinlock::new(BTreeMap::new());
@@ -60,6 +61,11 @@ impl CpuData for PerCpuData {
     }
 }
 
+/// Returns the ID of the bootstrap HART
+pub fn boot_hart_id() -> u64 {
+    unsafe { BOOT_HART_ID }
+}
+
 #[unsafe(naked)]
 extern "C" fn idle_task(_: usize) -> ! {
     core::arch::naked_asm!("1: nop; j 1b");