[build] Feature Switch to Enable PIC Support

[ppenna]

Description

Currently we employ a best-effort strategy to enable the PIC at startup time:

• If LAPIC is supported, we try to initialize it.
• If we fail, or if LAPIC is not supported, we try to enable the 8259 PIC.
• If we fail, we turn off PIC support.

We should have a feature switch that disables PIC support at build time, to avoid higher startup times on platforms that don't support interrupts at all.

Code Snippets

The code snippet bellows points to where we first detect that interrupts are not supported.

kernel/src/hal/mod.rs

Lines 77 to 85 in cc7d169

	// Initialize the interrupt manager.
	let intman: InterruptManager = match platform.arch.controller.take() {
	Some(controller) => InterruptManager::new(controller)?,
	None => {
	let reason: &str = "no interrupt controller found";
	error!("{}", reason);
	return Err(Error::new(ErrorCode::NoSuchDevice, reason));
	},
	};

[lemosep]

The feature must be pushed added into the cc7d169 branch?

[ppenna]

The feature must be pushed added into the cc7d169 branch?

No. Every PR should be opened towards latest dev branch. Permalink was used to link the concerned code-snippet here.

[ppenna]

@lemosep are you working on this issue?

[ppenna]

Removed previous asignees due to inactivity.