bug hunting

.gitignore

@@ -16,3 +16,15 @@ nanonote-gpio
 boot-programs/charset.data
 mips/nanonote/sdram-setup.raw
 nanonote-boot
+mips/nanonote/server/.deps/
+mips/nanonote/server/Makefile
+mips/nanonote/server/Makefile.in
+mips/nanonote/server/aclocal.m4
+mips/nanonote/server/autom4te.cache/
+mips/nanonote/server/config.log
+mips/nanonote/server/config.status
+mips/nanonote/server/configure
+mips/nanonote/server/depcomp
+mips/nanonote/server/install-sh
+mips/nanonote/server/missing
+mips/nanonote/server/usb-server

Makefile

@@ -50,4 +50,4 @@ clean:
 	rm -f *.o boot-programs/*.o $(BUILT_SOURCES) $(ARCH_CLEAN_FILES)
 
 .PHONY: clean
-.PRECIOUS: iris.hh boot-programs/crt0.o
+.PRECIOUS: iris.hh kernel.hh boot-programs/crt0.o

alloc.ccp

@@ -187,6 +187,7 @@ kThread *kMemory::alloc_thread (unsigned size):
 	ret->sp = 0
 	kThread_arch_init (ret)
 	ret->flags = 0
+	ret->id = ~0
 	ret->schedule_prev = NULL
 	ret->schedule_next = NULL
 	ret->slots = size

boot-programs/buzzer.ccp

@@ -53,6 +53,7 @@ enum codes:
 	BUZZER = 32
 
 Kernel::Num start ():
+	Kernel::schedule ()
 	map_tcu ()
 
 	DevBuzzer buzzer

boot-programs/init.ccp

@@ -20,7 +20,7 @@
 #include "iris.hh"
 
 static Keyboard sysreq
-static Device kbd_dev, buz_dev
+static Device kbd_dev, buz_dev, backlight_dev
 static unsigned slot
 
 // Event types.
@@ -28,6 +28,7 @@ enum type:
 	SYSREQ
 	KBDDEV
 	BUZDEV
+	BACKLIGHTDEV
 
 static void user_reply (Kernel::Cap target, unsigned dev):
 	switch dev:
@@ -91,6 +92,12 @@ static void setup ():
 						reply.invoke ()
 						Kernel::free_cap (reply)
 						break
+					case Setting::ID:
+						caps.set (BACKLIGHTDEV, arg.copy ())
+						backlight_dev = Kernel::Cap (slot, BACKLIGHTDEV)
+						reply.invoke ()
+						Kernel::free_cap (reply)
+						break
 					default:
 						kdebug ("unexpected device\n")
 						break
@@ -106,7 +113,7 @@ static void setup ():
 				Kernel::free_cap (arg)
 				continue
 		Kernel::free_cap (arg)
-		if ++state == 4:
+		if ++state == 5:
 			break
 	// sysreq
 	kdebug ("using sysreq\n")
@@ -119,8 +126,13 @@ static void setup ():
 	Kernel::free_cap (user)
 
 Kernel::Num start ():
+	Kernel::schedule ()
 	setup ()
 	kdebug ("init set up\n")
+	// claim backlight
+	kdebug ("claiming backlight\n")
+	Setting backlight = backlight_dev.create_user (Kernel::Cap ())
+	backlight_dev.use (backlight)
 	while true:
 		Kernel::wait ()
 		switch Kernel::recv.protected_data.value ():
@@ -129,8 +141,10 @@ Kernel::Num start ():
 				kdebug ("\n\nSystem request ")
 				if code & Keyboard::RELEASE:
 					kdebug ("released.\n\n")
+					backlight.set (~0)
 				else:
 					kdebug ("pressed.\n\n")
+					backlight.set (0)
 				break
 			default:
 				if Kernel::recv.data[0].l != Parent::GET_DEVICE:

boot-programs/lcd.ccp

@@ -28,8 +28,12 @@ extern unsigned char const charset[127-32][6]
 
 #if defined (TRENDTAC)
 static unsigned h = 800, v = 480, fps = 60, Bpp = 2
+#define LOG_X_BASE 1
+#define LOG_Y_BASE 1
 #elif defined (NANONOTE)
 static unsigned h = 320, v = 240, fps = 60, Bpp = 4
+#define LOG_X_BASE 0
+#define LOG_Y_BASE 0
 #else
 #error unknown board
 #endif
@@ -200,12 +204,12 @@ static void putchar (unsigned x, unsigned y, unsigned ch, unsigned fg = 0xffff,
 		for unsigned r = 0; r < 8; ++r:
 			LCD_FRAMEBUFFER_BASE[(y * 8 + r) * h + x * 6 + k] = lookup[charset[ch][k] & (1 << r) ? 1 : 0]
 
-static unsigned log_x = 1, log_y = 1
+static unsigned log_x = LOG_X_BASE, log_y = LOG_Y_BASE
 static void inc_logx ():
 	if ++log_x >= h / 6:
-		log_x = 1
+		log_x = LOG_X_BASE
 		if ++log_y >= v / 8:
-			log_y = 1
+			log_y = LOG_Y_BASE
 
 static void log_char (unsigned ch):
 	switch ch:
@@ -241,10 +245,9 @@ static void log_msg ():
 	log_char ('\n')
 
 enum captype:
-	#ifdef TRENDTAC
+	LOG = 32
-	LOG
-	#endif
 	SET_EOF_CB
+	BACKLIGHT
 
 static unsigned spot (unsigned x, unsigned y, unsigned cx, unsigned cy):
 	unsigned dx2 = (x - cx) * (x - cx)
@@ -256,6 +259,7 @@ static unsigned spot (unsigned x, unsigned y, unsigned cx, unsigned cy):
 	return ((l * l - d2 - 1) << 8) / (l * l)
 
 Kernel::Num start ():
+	Kernel::schedule ()
 	map_lcd ()
 	map_cpm ()
 	#ifdef NANONOTE
@@ -300,32 +304,118 @@ Kernel::Num start ():
 	__asm__ volatile ("li $a0, 1\nlw $a1, %0\nbreak" :: "m"(logcap.code): "a0", "a1", "memory")
 	#endif
 
+	// Register the backlight device.
+	Kernel::Cap backlight = Kernel::my_receiver.create_capability (BACKLIGHT)
+	Kernel::my_parent.provide_device <Setting> (backlight)
+
 	Kernel::Cap eof_cb
 	bool have_eof = false
+	bool is_on = true
+	unsigned backlight_user = 0
+	Kernel::Num current_backlight = 0
 	while true:
 		Kernel::wait ()
 		//log_msg ()
+		switch Kernel::recv.protected_data.h:
+			case 0:
 				switch Kernel::recv.protected_data.l:
 					case IRQ_LCD:
 						lcd_clr_eof ()
 						eof_cb.invoke ()
-				break
+						have_eof = false
-			case SET_EOF_CB:
-				if have_eof:
 						Kernel::free_cap (eof_cb)
-				else:
-					have_eof = true
-				eof_cb = Kernel::get_arg ()
-				Kernel::Cap reply = Kernel::get_reply ()
-				Kernel::register_interrupt (IRQ_LCD)
-				reply.invoke ()
-				Kernel::free_cap (reply)
 						break
-			#ifdef TRENDTAC
+					#if defined (TRENDTAC)
 					case LOG:
 						log_char (Kernel::recv.data[0].l)
 						break
 					#endif
+					case BACKLIGHT:
+						switch Kernel::recv.data[0].l:
+							case Device::CREATE_USER:
+								Kernel::Cap reply = Kernel::get_reply ()
+								Kernel::Cap c = Kernel::my_receiver.create_capability (Kernel::Num (backlight_user++, BACKLIGHT))
+								reply.invoke (0, 0, c.copy ())
+								Kernel::free_cap (c)
+								Kernel::free_cap (reply)
+								break
+							case Device::DESTROY_USER:
+								Kernel::recv.reply.invoke ()
+								break
+							case Device::USE:
+								Kernel::Cap reply = Kernel::get_reply ()
+								Kernel::Cap arg = Kernel::get_arg ()
+								current_backlight = Kernel::my_receiver.get_protected (arg)
+								reply.invoke ()
+								Kernel::free_cap (arg)
+								Kernel::free_cap (reply)
+								break
+							case Device::UNUSE:
+								Kernel::Cap reply = Kernel::get_reply ()
+								Kernel::Cap arg = Kernel::get_arg ()
+								if current_backlight.value () == Kernel::my_receiver.get_protected (arg).value ():
+									current_backlight = 0
+								reply.invoke ()
+								Kernel::free_cap (arg)
+								Kernel::free_cap (reply)
+								break
+							default:
+								log_char ('@')
+								break
+						break
+					default:
+						log_char ('#')
+						log_num (Kernel::recv.protected_data)
+						log_char ('\n')
+						break
+				break
+			case BACKLIGHT:
+				if current_backlight.value () != Kernel::recv.protected_data.value ():
+					log_char ('&')
+					log_num (current_backlight)
+					log_num (Kernel::recv.protected_data)
+					log_char ('\n')
+					break
+				switch Kernel::recv.data[0].l:
+					case Setting::SET:
+						// TODO
+						unsigned state = Kernel::recv.data[1].l
+						if !state:
+							#if defined (NANONOTE)
+							if is_on:
+								write_reg (BACKLIGHT1, 0x5e)
+								is_on = false
+							#else
+							#endif
+						else:
+							#if defined (NANONOTE)
+							if !is_on:
+								write_reg (BACKLIGHT1, 0x5f)
+								is_on = true
+							#else
+							#endif
+						Kernel::recv.reply.invoke ()
+						break
+					case Setting::GET_RANGE:
+						Kernel::recv.reply.invoke (~0)
+						break
+					default:
+						log_char ('$')
+						break
+				break
+			case SET_EOF_CB:
+				Kernel::Cap reply = Kernel::get_reply ()
+				if have_eof:
+					Kernel::free_cap (eof_cb)
+				else:
+					Kernel::register_interrupt (IRQ_LCD)
+					have_eof = true
+				eof_cb = Kernel::get_arg ()
+				reply.invoke ()
+				Kernel::free_cap (reply)
+				break
 			default:
 				log_char ('~')
+				log_num (Kernel::recv.protected_data)
+				log_char ('\n')
 				break

boot-programs/metronome.ccp

@@ -20,6 +20,7 @@
 #include "keys.hh"
 
 Kernel::Num start ():
+	Kernel::schedule ()
 	kdebug ("metronome started\n")
 	Buzzer buzzer = Kernel::my_parent.get_device <Buzzer> ()
 	Keyboard kbd = Kernel::my_parent.get_device <Keyboard> ()

boot-programs/nanonote-gpio.ccp

@@ -195,6 +195,7 @@ enum codes:
 	PWR
 
 Kernel::Num start ():
+	Kernel::schedule ()
 	map_gpio ()
 
 	DevKbd kbd

boot-programs/udc.ccp

@@ -154,6 +154,9 @@ class Udc:
 	bool vendor (Setup *s)
 	bool get_descriptor (unsigned type, unsigned idx, unsigned len)
 	bool handle_setup (Setup *s)
+	char log_buffer[1000]
+	unsigned log_buffer_size
+	unsigned log_buffer_start
 	public:
 	void init ()
 	void log (unsigned c)
@@ -193,6 +196,8 @@ void Udc::init ():
 	s_langs = (String <1>){ sizeof (String <1>), String <1>::Type, { 0x0409 } }
 	s_manufacturer = (String <6>){ sizeof (String <6>), String <6>::Type, { 's', 'h', 'e', 'v', 'e', 'k' } }
 	s_product = (String <16>){ sizeof (String <16>), String <16>::Type, { 'I', 'r', 'i', 's', ' ', 'o', 'n', ' ', 'N', 'a', 'n', 'o', 'N', 'o', 't', 'e' } }
+	log_buffer_size = 0
+	log_buffer_start = 0
 
 	// Disconnect from the bus and don't try to get high-speed.
 	UDC_POWER &= ~(UDC_POWER_SOFTCONN | UDC_POWER_HSENAB)
@@ -210,31 +215,41 @@ void Udc::init ():
 	// enable interrupts on endpoint 0.
 	UDC_INTRINE |= 1 << 0
 	UDC_INDEX = 0
-	// Wait a bit and connect to the host.
+	// Connect to the host.
-	Kernel::my_receiver.sleep (10)
 	UDC_POWER |= UDC_POWER_SOFTCONN
 
 bool Udc::vendor (Setup *s):
-	if s->request_type & 0x80:
+	if !(s->request_type & 0x80):
+		return true
+	if s->request == 10:
+		static char b[2]
+		ptr = b
+		size = s->length < 2 ? s->length : 2
+		b[0] = '#'
+		if log_buffer_start == log_buffer_size:
+			size = 1
+		else:
+			b[1] = log_buffer[log_buffer_start++]
+		if log_buffer_start == log_buffer_size:
+			log_buffer_start = 0
+			log_buffer_size = 0
+	else:
 		static char const *name = "Reboot"
 		ptr = name
 		size = s->length < 6 ? s->length : 6
-		state = TX
 		rebooting = true
-		return true
+	state = TX
 	return true
 
 bool Udc::get_descriptor (unsigned type, unsigned idx, unsigned len):
 	switch type:
 		case Configuration::Type:
-			//kdebug ("config\n")
 			if idx != 0:
 				return false
 			ptr = reinterpret_cast <char const *> (&config_descriptor)
 			size = (len < sizeof (config_descriptor) ? len : sizeof (config_descriptor))
 			break
 		case Device::Type:
-			//kdebug ("device\n")
 			if idx != 0:
 				return false
 			ptr = reinterpret_cast <char const *> (&device_descriptor)
@@ -249,7 +264,6 @@ bool Udc::get_descriptor (unsigned type, unsigned idx, unsigned len):
 			return false
 		// The 6 is an arbitrary number, except that String <6> in instantiated already.
 		case String <6>::Type:
-			//kdebug ("string\n")
 			switch idx:
 				case 0:
 					ptr = reinterpret_cast <char const *> (&s_langs)
@@ -272,17 +286,6 @@ bool Udc::get_descriptor (unsigned type, unsigned idx, unsigned len):
 	return true
 
 bool Udc::handle_setup (Setup *s):
-	//kdebug ("udc: setup: type=")
-	//kdebug_num (s->request_type, 2)
-	//kdebug ("; request=")
-	//kdebug_num (s->request, 2)
-	//kdebug ("; value=")
-	//kdebug_num (s->value, 4)
-	//kdebug ("; index=")
-	//kdebug_num (s->index, 4)
-	//kdebug ("; length=")
-	//kdebug_num (s->length, 4)
-	//kdebug ("\n")
 	switch s->request_type:
 		case STANDARD_TO_DEVICE:
 			switch s->request:
@@ -333,7 +336,6 @@ bool Udc::handle_setup (Setup *s):
 void Udc::interrupt ():
 	unsigned i = UDC_INTRUSB
 	if i & UDC_INTR_RESET:
-		//kdebug ("udc: reset\n")
 		state = IDLE
 		return
 	i = UDC_INTRIN
@@ -357,24 +359,18 @@ void Udc::interrupt ():
 				packet.d[1] = UDC_FIFO (0)
 				UDC_CSR0 = csr | UDC_CSR0_DATAEND | UDC_CSR0_SVDOUTPKTRDY
 				if !handle_setup (&packet.s):
-					//kdebug ("stall 1\n")
 					csr |= UDC_CSR0_SENDSTALL
 					break
 				if size == 0:
 					return
 				// Fall through.
 			case TX:
-				//kdebug ("udc: send next:")
 				unsigned i
 				for i = 0; (size & ~3) > 0 && i < max_packet_size0; i += 4, size -= 4:
-					//for unsigned i = 0; i < 4; ++i:
-						//kdebug_num (ptr[i], 2)
 					UDC_FIFO (0) = *(unsigned *)ptr
 					ptr += 4
 				for ; size > 0 && i < max_packet_size0; ++i, --size:
-					//kdebug_num (*ptr, 2)
 					UDC_FIFO8 (0) = *ptr++
-				//kdebug ("\n")
 				if i == max_packet_size0:
 					csr |= UDC_CSR0_INPKTRDY
 				else:
@@ -383,19 +379,19 @@ void Udc::interrupt ():
 				break
 			case RX:
 				// Not supported.
-				//kdebug ("stall 2\n")
 				csr |= UDC_CSR0_SVDOUTPKTRDY | UDC_CSR0_SENDSTALL
 				state = IDLE
 				break
 		UDC_CSR0 = csr
 
 void Udc::log (unsigned c):
-	kdebug ("udc: log ")
+	if log_buffer_size >= sizeof (log_buffer):
-	kdebug_char (c)
+		return
-	kdebug ("\n")
+	log_buffer[log_buffer_size++] = c
 
 enum pdata:
 	LOG = 32
+	FS
 
 Kernel::Num start ():
 	map_udc ()
@@ -403,12 +399,18 @@ Kernel::Num start ():
 	map_cpm ()
 	Udc udc
 
-	udc.init ()
 	Kernel::Cap logcap = Kernel::my_receiver.create_capability (LOG)
 	__asm__ volatile ("li $a0, 1\nlw $a1, %0\nbreak" :: "m"(logcap.code): "a0", "a1", "memory")
+	udc.init ()
 	Kernel::register_interrupt (IRQ_UDC)
+	Device fs_dev = Kernel::my_receiver.create_capability (FS)
+	Kernel::my_parent.provide_device <Directory> (fs_dev)
+	Kernel::Num current_user = 0
+	unsigned next_user
 	while true:
 		Kernel::wait ()
+		switch Kernel::recv.protected_data.h:
+			case 0:
 				switch Kernel::recv.protected_data.l:
 					case IRQ_UDC:
 						udc.interrupt ()
@@ -417,6 +419,57 @@ Kernel::Num start ():
 					case LOG:
 						udc.log (Kernel::recv.data[0].l)
 						break
+					case FS:
+						switch Kernel::recv.data[0].l:
+							case Device::CREATE_USER:
+								Kernel::Cap reply = Kernel::get_reply ()
+								Kernel::Cap c = Kernel::my_receiver.create_capability (Kernel::Num (next_user++, FS))
+								reply.invoke (0, 0, c.copy ())
+								Kernel::free_cap (c)
+								Kernel::free_cap (reply)
+								break
+							case Device::DESTROY_USER:
+								Kernel::Cap reply = Kernel::get_reply ()
+								reply.invoke ()
+								Kernel::free_cap (reply)
+								break
+							case Device::USE:
+								Kernel::Cap reply = Kernel::get_reply ()
+								Kernel::Cap arg = Kernel::get_arg ()
+								current_user = Kernel::my_receiver.get_protected (arg)
+								reply.invoke ()
+								Kernel::free_cap (reply)
+								Kernel::free_cap (arg)
+								break
+							case Device::UNUSE:
+								Kernel::Cap reply = Kernel::get_reply ()
+								Kernel::Cap arg = Kernel::get_arg ()
+								if current_user.value () == Kernel::my_receiver.get_protected (arg).value ():
+									current_user = 0
+								reply.invoke ()
+								Kernel::free_cap (reply)
+								Kernel::free_cap (arg)
+								break
+						break
 					default:
 						udc.log ('~')
+						char digit[] = "0123456789abcdef"
+						for unsigned i = 0; i < 8; ++i:
+							udc.log (digit[(Kernel::recv.protected_data.l >> (4 * (7 - i))) & 0xf])
+						udc.log ('\n')
+						break
+			case FS:
+				if current_user.value () != Kernel::recv.protected_data.value ():
+					break
+				switch Kernel::recv.data[0].l:
+					case Directory::GET_SIZE:
+					case Directory::GET_NAME:
+					case Directory::GET_FILE_RO:
+					case Directory::LOCK_RO:
+					case Directory::UNLOCK_RO:
+						Kernel::recv.reply.invoke ()
+						break
+					case Directory::GET_FILE_INFO:
+					default:
+						Kernel::recv.reply.invoke (~0)
 						break

devices.hhp

@@ -171,6 +171,7 @@ struct Display : public Kernel::Cap:
 		CREATE_FB
 		USE_FB
 		GET_INFO
+		SET_STATE
 		ID
 	// Register an end-of-frame callback.
 	// At end of frame, the callback is invoked and forgotten.  It must be reregistered to keep a stream of events.
@@ -192,6 +193,19 @@ struct Display : public Kernel::Cap:
 		// TODO: Interface is to be designed.
 
 
+// Numeric setting, such as a display backlight.
+struct Setting : public Kernel::Cap:
+	Setting (Kernel::Cap c = Kernel::Cap ()) : Kernel::Cap (c):
+	enum request:
+		SET = Display::ID
+		GET_RANGE
+		ID
+	// Set a new value.
+	void set (unsigned value):
+		call (CAP_MASTER_DIRECT | SET, value)
+	// Get the maximum value for this setting.  Using a higher value with SET gives undefined results.
+	unsigned get_range ():
+		return call (CAP_MASTER_DIRECT | GET_RANGE).l
 
 // File system interface.
 // filesystem-related interfaces: directory, stream, seekable.
@@ -202,7 +216,7 @@ struct Display : public Kernel::Cap:
 struct Directory : public Kernel::Cap:
 	Directory (Kernel::Cap c = Kernel::Cap ()) : Kernel::Cap (c):
 	enum request:
-		GET_SIZE = Display::ID
+		GET_SIZE = Setting::ID
 		GET_NAME
 		GET_FILE_RO
 		GET_FILE_INFO
@@ -254,7 +268,7 @@ struct WDirectory : public Directory:
 		call (CAP_MASTER_DIRECT | LOCK)
 	// Unlock the directory.  Write operations can only be done when the directory is locked.
 	void unlock ():
-		call (CAP_MASTER_DIRECT | LOCK)
+		call (CAP_MASTER_DIRECT | UNLOCK)
 
 // Stream interface.
 struct Stream : public Kernel::Cap:

invoke.ccp

@@ -49,6 +49,8 @@ static void log_message (char const *prefix, unsigned target, unsigned pdata, kC
 void kThread::raise (unsigned code, unsigned data):
 	dpanic (code, "raise")
 	dbg_log ("raise ")
+	dbg_log_num (old_current->id, 2)
+	dbg_log_char (':')
 	dbg_log_num ((unsigned)old_current)
 	dbg_log_char ('/')
 	if code < Kernel::NUM_EXCEPTION_CODES:

iris.hhp

@@ -492,7 +492,7 @@ namespace Kernel:
 
 	void Receiver::sleep (unsigned value):
 		my_receiver.set_alarm (value)
-		wait ()
+		Cap ().call ()
 
 // The start function has this prototype (there is no main function).
 Kernel::Num start ()

kernel.hhp

@@ -120,6 +120,9 @@ struct kThread : public kObject:
 	unsigned recv_reply, recv_arg
 	// caps is an array of slots pointers to kCapses.
 	unsigned slots
+	#ifndef NDEBUG
+	unsigned id
+	#endif
 	struct caps_store:
 		_slot_data prev, next
 		kCapsP caps

memory.ccp

@@ -10,7 +10,7 @@ static void clear_page (unsigned page, unsigned num = 1):
 	if *((unsigned *)page) != 0 || ((unsigned *)page)[(num << (PAGE_BITS - 2)) - 1] != 0:
 		dpanic (0, "clear_page didn't work")
 
-#if 0
+#if 1
 
 static unsigned free_begin
 static unsigned free_end
@@ -33,10 +33,12 @@ void phys_free (unsigned page, unsigned num):
 	// Not supported.
 
 #ifndef NDEBUG
-void check_impl (kObject *o, unsigned num, char const *msg):
+/*void check_impl (kObject *o, unsigned num, char const *msg):
-	for ; o; o = o->next:
+//	for ; o; o = (kObject *)o->next:
-		if (unsigned)o >= (unsigned)free_begin && (unsigned)o < (unsigned)free_end:
+//		if (unsigned)o >= (unsigned)free_begin && (unsigned)o < (unsigned)free_end:
-			panic (num, msg)
+*/ //			panic (num, msg)
+bool check_free (kObject *o, unsigned size):
+	return true
 void print_free ():
 #endif
 #else

mips/arch.ccp

@@ -166,6 +166,9 @@ static void tlb_reset (unsigned address, unsigned asid, unsigned value):
 		__asm__ volatile ("tlbwi")
 
 static void free_page (arch_page_table *t, arch_page *p):
+	dbg_log ("free page ")
+	dbg_log_num ((unsigned)p)
+	dbg_log_char ('\n')
 	if p->prev_mapped:
 		p->prev_mapped->next_mapped = p->next_mapped
 	else:

mips/init.ccp

@@ -119,6 +119,9 @@ static void init_threads ():
 		kMemory *mem = top_memory.alloc_memory ()
 		assert (mem)
 		kThread *thread = mem->alloc_thread (NUM_SLOTS)
+		#ifndef NDEBUG
+		thread->id = i
+		#endif
 		kPage **pages = (kPage **)mem->zalloc ()
 		Elf32_Ehdr *header = (Elf32_Ehdr *)thread_start[i]
 		for unsigned j = 0; j < SELFMAG; ++j:
@@ -150,12 +153,21 @@ static void init_threads ():
 			//bool executable = shdr->sh_flags & SHF_EXEC_INSTR
 			if shdr->sh_type != SHT_NOBITS:
 				unsigned file_offset = shdr->sh_offset >> PAGE_BITS
-				if ((file_offset + shdr->sh_size) >> PAGE_BITS) >= (PAGE_SIZE >> 2):
+				if (file_offset + ((shdr->sh_size + PAGE_SIZE - 1) >> PAGE_BITS)) >= (PAGE_SIZE >> 2):
 					panic (0x87446809, "initial thread too large")
 					return
 				for unsigned p = (shdr->sh_addr & PAGE_MASK); p < shdr->sh_addr + shdr->sh_size; p += PAGE_SIZE:
 					unsigned section_offset = (p - (shdr->sh_addr & PAGE_MASK)) >> PAGE_BITS
 					unsigned idx = file_offset + section_offset
+					kPage *page = mem->get_mapping (p, &readonly)
+					if page:
+						if !pages[idx]:
+							panic (0, "multiple pages mapped to one address in initial file")
+							return
+						if pages[idx]->frame != page->frame:
+							panic (0, "different pages mapped to one address in intitial file")
+							return
+						continue
 					if !pages[idx]:
 						pages[idx] = mem->alloc_page ()
 						pages[idx]->frame = thread_start[i] + (idx << PAGE_BITS)

mips/interrupts.ccp

@@ -25,16 +25,15 @@ void arch_flush_cache ():
 		__asm__ volatile ("lw $k0, %0; cache 0, 0($k0); cache 1, 0($k0)" :: "m"(line))
 
 static void handle_exit ():
+	--dbg_code.h
 	// Set must_wait to false, so random threads are not set to waiting when the kernel invokes something (such as a dbg_cap).
 	must_wait = false
 	if !current || (current == &idle):
 		schedule ()
 		if !current:
 			current = &idle
-	if (current->flags & (Kernel::Thread::RUNNING | Kernel::Thread::WAITING)) != Kernel::Thread::RUNNING:
+	//if (current->flags & (Kernel::Thread::RUNNING | Kernel::Thread::WAITING)) != Kernel::Thread::RUNNING:
-		panic (current->flags, "non-scheduled thread running")
+	//panic (current->flags, "non-scheduled thread running")
-		if !current:
-			current = &idle
 	if old_current == current:
 		return
 	//dbg_send ((unsigned)current >> 12, 3)
@@ -64,6 +63,7 @@ static void handle_exit ():
 /// when k0 or k1 is not 0, or when an error occurs.
 /// Otherwise, the ultra-fast code in entry.S is used.
 kThread *tlb_refill ():
+	++dbg_code.h
 	old_current = current
 	if !directory:
 		unsigned addr
@@ -89,6 +89,7 @@ kThread *tlb_refill ():
 
 /// An interrupt which is not an exception has occurred.
 kThread *interrupt ():
+	++dbg_code.h
 	old_current = current
 	unsigned ipr = INTC_IPR
 	for unsigned i = 0; i < 32; ++i:
@@ -155,6 +156,7 @@ static void arch_invoke ():
 
 /// A general exception has occurred.
 kThread *exception ():
+	++dbg_code.h
 	old_current = current
 	unsigned cause
 	cp0_get (CP0_CAUSE, cause)
@@ -225,6 +227,7 @@ kThread *exception ():
 				if !dbg_cap.valid ():
 					dpanic (0, "no log capability provided")
 					break
+				dbg_log ("log capability registered.\n")
 				break
 			dbg_log_char (current->arch.a[1])
 			#endif
@@ -287,6 +290,7 @@ kThread *exception ():
 
 /// There's a cache error.  Big trouble.  Probably not worth trying to recover.
 kThread *cache_error ():
+	++dbg_code.h
 	panic (0x33333333, "cache error")
 	old_current = current
 	handle_exit ()

mips/nanonote/Makefile.arch

@@ -18,7 +18,7 @@
 load = 0x80000000
 
 ARCH_CXXFLAGS = -DNUM_THREADS=6
-ARCH_CPPFLAGS = -I. -Imips -Imips/nanonote -Wa,-mips32 -DNANONOTE -DUSE_SERIAL
+ARCH_CPPFLAGS = -I. -Imips -Imips/nanonote -Wa,-mips32 -DNANONOTE #-DUSE_SERIAL
 CROSS = mipsel-linux-gnu-
 OBJDUMP = $(CROSS)objdump
 junk = mdebug.abi32 reginfo comment pdr
@@ -30,12 +30,14 @@ boot_sources = mips/init.cc mips/nanonote/board.cc
 arch_headers = mips/arch.hh mips/nanonote/jz4740.hh mips/nanonote/board.hh
 boot_threads = init udc nanonote-gpio buzzer metronome lcd
 
-test: iris.raw mips/nanonote/server/usb-server
+test: iris.raw mips/nanonote/server/usb-server mips/nanonote/sdram-setup.raw
 	echo "reboot 0xa$(shell /bin/sh -c '$(OBJDUMP) -t iris.elf | grep __start$$ | cut -b2-8')" | nc localhost 5050
 .PHONY: test
 
 mips/nanonote/server/usb-server: mips/nanonote/server/usb-server.ccp mips/nanonote/server/Makefile.am mips/nanonote/server/configure.ac
 	$(MAKE) -C mips/nanonote/server
+	echo "shutdown" | nc localhost 5050
+	sleep 1
 
 %.elf: %.o
 	$(LD) $(LDFLAGS) -o $@ $<
@@ -66,6 +68,10 @@ boot-programs/charset.data: boot-programs/charset
 iris.elf: mips/entry.o $(subst .cc,.o,$(iris_sources)) mips/nanonote/threadlist.o mips/boot.o $(subst .cc,.o,$(boot_sources))
 	$(LD) $(LDFLAGS) $^ -o $@
 
+server:
+	while mips/nanonote/server/usb-server ; do : ; done
+
 ARCH_CLEAN_FILES = $(boot_sources) $(addsuffix .elf,$(boot_threads)) $(arch_headers) devices.hh keys.hh mips/*.o mips/nanonote/*.o boot-programs/charset.data iris.elf iris.raw mips/nanonote/sdram-setup.elf mips/nanonote/sdram-setup.raw
 
 .PRECIOUS: mips/arch.hh mips/nanonote/jz4740.hh mips/nanonote/board.hh 
+.PHONY: server

mips/nanonote/server/Makefile.am

@@ -27,4 +27,7 @@ PYPP = /usr/bin/pypp
 %.cc: %.ccp
 	$(PYPP) --name $< < $< > $@
 
+run:
+	$(top_buiddir)/usb-server
+
 BUILT_SOURCES = usb-server.cc

mips/nanonote/server/usb-server.ccp

@@ -54,15 +54,34 @@ struct data:
 		VR_FLUSH_CACHES		= 3
 		VR_PROGRAM_START1	= 4
 		VR_PROGRAM_START2	= 5
+		POLL	= 10
 	void request (requests num, unsigned data = 0)
 	void send_file (unsigned address, unsigned size, char const *data)
 	void reboot ():
-		// This always fails, because the device doesn't answer.  However, that means there's nothing wrong, so don't complain.
+		char buffer[8]
-		usb_control_msg (handle, USB_ENDPOINT_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE, VR_GET_CPU_INFO, 0, 0, NULL, 8, timeout)
+		if usb_control_msg (handle, USB_ENDPOINT_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE, VR_GET_CPU_INFO, 0, 0, buffer, 8, timeout) < 0:
+			std::cerr << "unable to send reboot message to device: " << usb_strerror () << std::endl
 		usb_release_interface (handle, 0)
 		usb_close (handle)
 		handle = NULL
 	void get_device (unsigned vendor, unsigned product, unsigned tries)
+	void poll ()
+
+void data::poll ():
+	while true:
+		char buffer[2]
+		int s = usb_control_msg (handle, USB_ENDPOINT_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE, POLL, 0, 0, buffer, 8, timeout)
+		if s < 1 || s > 2 || buffer[0] != '#':
+			std::cerr << "unable to send poll message to device: " << usb_strerror () << std::endl
+			usb_release_interface (handle, 0)
+			usb_close (handle)
+			handle = NULL
+			return
+		if s != 1:
+			std::cout << buffer[1] << std::flush
+		else:
+			break
+	(shevek::absolute_time () + shevek::relative_time (1, 0)).schedule (sigc::mem_fun (*this, &data::poll))
 
 struct client : public shevek::server <client, data *>::connection:
 	static Glib::RefPtr <client> create ():
@@ -75,6 +94,9 @@ struct client : public shevek::server <client, data *>::connection:
 		unsigned entry
 		if l ("reboot %x%", entry):
 			get_server ()->data ()->boot (entry)
+		else if l ("shutdown%"):
+			std::cerr << "shutting down\n"
+			shevek::end_loop ()
 		else:
 			out->write ("invalid command\n")
 		if !keep:
@@ -112,10 +134,11 @@ void data::get_device (unsigned vendor, unsigned product, unsigned tries):
 					continue
 				handle = usb_open (dev)
 				if usb_claim_interface (handle, 0) < 0:
-					std::cerr << "unable to claim interface\n"
+					std::cerr << "unable to claim interface: " << usb_strerror () << "\n"
 					usb_close (handle)
 					handle = NULL
 					continue
+				(shevek::absolute_time () + shevek::relative_time (1, 0)).schedule (sigc::mem_fun (*this, &data::poll))
 				return
 		if i + 1 < tries:
 			//std::cerr << "failed to find device, still trying...\n"

mips/nanonote/threadlist.S

@@ -25,7 +25,7 @@ thread0:
 
 	.balign 0x1000
 thread1:
-	.incbin "lcd.elf"
+	.incbin "udc.elf"
 
 	.balign 0x1000
 thread2:
@@ -41,8 +41,9 @@ thread4:
 
 	.balign 0x1000
 thread5:
-	.incbin "udc.elf"
+	.incbin "lcd.elf"
 
+	.balign 0x1000
 thread6:
 
 // Everything from here may be freed after kernel initialization.

mips/trendtac/threadlist.S

@@ -31,6 +31,7 @@ thread1:
 thread2:
 	.incbin "gpio.elf"
 
+	.balign 0x1000
 thread3:
 
 // Everything from here may be freed after kernel initialization.

panic.ccp

@@ -25,7 +25,7 @@ void dbg_log_char (unsigned ch):
 	UART0_TDR = ch
 #else
 void dbg_log_char (unsigned ch):
-	if !dbg_cap.valid ():
+	if !dbg_cap.valid () || dbg_code.l:
 		return
 	kCapability::Context c
 	c.data[0] = ch
@@ -63,6 +63,8 @@ void panic_impl (unsigned n, unsigned line, char const *name, char const *messag
 		#endif
 		// Use the (now running) log thread to display the message.
 		dbg_log ("Panic: caller = ")
+		dbg_log_num (old_current->id, 2)
+		dbg_log (":")
 		dbg_log_num ((unsigned)old_current)
 		if old_current:
 			dbg_log_char ('@')
@@ -75,6 +77,8 @@ void panic_impl (unsigned n, unsigned line, char const *name, char const *messag
 		dbg_log (message)
 		dbg_log_char ('/')
 		dbg_log_num (n)
+		dbg_log_char (';')
+		dbg_log_num (dbg_code.h)
 		dbg_log (" bad vaddr = ")
 		unsigned a
 		cp0_get (CP0_BAD_V_ADDR, a)