iris/boot-programs/init.ccp

#pypp 0
// Iris: micro-kernel for a capability-based operating system.
// boot-programs/init.ccp: System boot manager.
// Copyright 2009 Bas Wijnen <wijnen@debian.org>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

#include "devices.hh"
#include "iris.hh"

static Keyboard sysreq
static Device kbd_dev, buz_dev
static unsigned slot

// Event types.
enum type:
	SYSREQ
	KBDDEV
	BUZDEV

static void user_reply (Kernel::Cap target, unsigned dev):
	switch dev:
		case Keyboard::ID:
			// keyboard user
			kdebug ("keyboard requested\n")
			Kernel::Cap kbd = kbd_dev.create_user (Kernel::Cap ())
			kbd_dev.use (kbd)
			target.invoke (0, 0, kbd.copy ())
			Kernel::free_cap (kbd)
			break
		case Buzzer::ID:
			// buzzer user
			kdebug ("buzzer requested\n")
			Kernel::Cap buzzer = buz_dev.create_user (Kernel::Cap ())
			buz_dev.use (buzzer)
			kdebug ("invoking reply: ")
			kdebug_num (target.code)
			kdebug ("\n")
			target.invoke (0, 0, buzzer.copy ())
			Kernel::free_cap (buzzer)
			break
		default:
			kdebug ("invalid id requested:")
			kdebug_num (dev)
			kdebug_char ('\n')
			break

static void setup ():
	unsigned state = 0
	Kernel::Caps caps = Kernel::my_memory.create_caps (32)
	slot = caps.use ()
	Kernel::Cap user
	unsigned device
	while true:
		Kernel::wait ()
		Kernel::Cap reply = Kernel::get_reply ()
		Kernel::Cap arg = Kernel::get_arg ()
		switch Kernel::recv.data[0].l:
			case Parent::PROVIDE_DEVICE:
				switch Kernel::recv.data[1].l:
					case Keyboard::ID:
						switch Kernel::recv.data[0].h:
							case 0:
								caps.set (KBDDEV, arg.copy ())
								kbd_dev = Kernel::Cap (slot, KBDDEV)
								break
							case 1:
								caps.set (SYSREQ, arg.copy ())
								sysreq = Kernel::Cap (slot, SYSREQ)
								break
							default:
								kdebug ("unexpected keyboard\n")
								break
						reply.invoke ()
						Kernel::free_cap (reply)
						break
					case Buzzer::ID:
						caps.set (BUZDEV, arg.copy ())
						buz_dev = Kernel::Cap (slot, BUZDEV)
						reply.invoke ()
						Kernel::free_cap (reply)
						break
					default:
						kdebug ("unexpected device\n")
						break
				break
			case Parent::GET_DEVICE:
				user = reply
				device = Kernel::recv.data[1].l
				break
			default:
				kdebug ("unknown setup request for init\n")
				reply.invoke ()
				Kernel::free_cap (reply)
				Kernel::free_cap (arg)
				continue
		Kernel::free_cap (arg)
		if ++state == 4:
			break
	// sysreq
	kdebug ("using sysreq\n")
	Kernel::Cap cb = Kernel::my_receiver.create_capability (SYSREQ)
	sysreq.set_cb (cb.copy ())
	Kernel::free_cap (cb)
	// First user reply.
	kdebug ("sending first user reply\n")
	user_reply (user, device)
	Kernel::free_cap (user)

Kernel::Num start ():
	setup ()
	kdebug ("init set up\n")
	while true:
		Kernel::wait ()
		switch Kernel::recv.protected_data.value ():
			case SYSREQ:
				unsigned code = Kernel::recv.data[0].l
				kdebug ("\n\nSystem request ")
				if code & Keyboard::RELEASE:
					kdebug ("released.\n\n")
				else:
					kdebug ("pressed.\n\n")
				break
			default:
				if Kernel::recv.data[0].l != Parent::GET_DEVICE:
					kdebug ("invalid call from user\n")
					break
				Kernel::Cap reply = Kernel::get_reply ()
				user_reply (reply, Kernel::recv.data[1].l)
				Kernel::free_cap (reply)
				break