starting list object implementation

bootstrap/init.ccp

@@ -0,0 +1,136 @@
+#pypp 0
+// Iris: micro-kernel for a capability-based operating system.
+// bootstrap/init.ccp: Bootstrapping code.
+// 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"
+
+struct file:
+	unsigned size
+	// Only the first 16 characters of the name are used, because that's much easier.
+	// This means that file names must be different in the first 16 characters if sort order matters.
+	char name[16]
+	String string
+
+static unsigned num_files
+static file *files
+static unsigned index
+static Kernel::Memory top_memory
+static unsigned max_pages
+static char *mapping
+
+// Get the initial block device and filesystem.
+static Directory receive_devices ():
+	String dev
+	Filesystem fs
+	for unsigned i = 0; i < 2; ++i:
+		Kernel::wait ()
+		if Kernel::recv.data[0].l != Parent::PROVIDE_DEVICE:
+			kdebug ("Invalid bootstrap request.\n")
+			Kernel::panic (0)
+		switch Kernel::recv.data[1].l:
+			case String::ID:
+				if dev:
+					kdebug ("duplicate device.\n")
+					Kernel::panic (0)
+				dev = Kernel::get_arg ()
+				Kernel::recv.reply.invoke ()
+				break
+			case Filesystem::ID:
+				if fs:
+					kdebug ("duplicate filesystem.\n")
+					Kernel::panic (0)
+				fs = Kernel::get_arg ()
+				Kernel::recv.reply.invoke ()
+				break
+			default:
+				kdebug ("unexpected device: ")
+				kdebug_num (Kernel::recv.data[1].l)
+				kdebug_char ('\n')
+				Kernel::panic (0)
+	// Initialize the root file system.
+	Directory root = fs.use_device (dev.copy ())
+	Kernel::free_cap (dev)
+	Kernel::free_cap (fs)
+	return root
+
+// Make a list of all files.
+static void list_files (Directory root):
+	Kernel::Num fullsize = root.get_size ()
+	if fullsize.h != 0:
+		kdebug ("Too many files in bootstrap directory.\n")
+		Kernel::panic (0)
+	num_files = fullsize.l
+	files = new file[num_files]
+	Kernel::Caps caps = Kernel::my_memory.create_caps (num_files * 2)
+	unsigned slot = Kernel::alloc_slot ()
+	caps.use (slot)
+	for unsigned i = 0; i < num_files; ++i:
+		Kernel::set_recv_arg (Kernel::Cap (slot, i * 2))
+		String n = root.get_name (i)
+		n.get_chars (0, files[i].name)
+		Kernel::set_recv_arg (Kernel::Cap (slot, i * 2 + 1))
+		files[i].string = root.get_file_ro (i)
+		Kernel::Num fullsize = files[i].string.get_size ()
+		if fullsize.h != 0:
+			kdebug ("initial file size too large.\n")
+			Kernel::panic (0)
+		files[i].size = fullsize.l
+		if max_pages < (fullsize.l + PAGE_SIZE - 1) & PAGE_MASK:
+			max_pages = (fullsize.l + PAGE_SIZE - 1) & PAGE_MASK
+
+// Sort the list of files.
+static bool is_less (file *f1, file *f2):
+	return 
+
+// Bubble sort.
+static void sort ():
+	index = new unsigned[num_files]
+	index[0] = 0
+	// Invariant: index[0...f-1] is sorted.
+	for unsigned f = 1; f < num_files; ++f:
+		// Bubble up until top.  Test for less-than, because it wraps to maxunsigned.
+		unsigned i
+		// Invariant: index[0...f] \ index[i+1] is sorted and index[i+1...f] is sorted.
+		for i = f - 1; i < f; --i:
+			if is_less (&files[index[i]], &files[f]):
+				break
+			index[i + 1] = index[i]
+		index[i + 1] = f
+
+static void run (file *f):
+	Kernel::Memory mem = top_memory.create_memory ()
+	unsigned num_pages = (f->size + PAGE_SIZE - 1) & PAGE_MASK
+	for unsigned p = 0; p < num_pages; ++p:
+		pages[p] = f->string.get_page (p << PAGE_BITS, mem.create_page ())
+		Kernel::my_memory.map (pages[p], (unsigned)&mapping[p << PAGE_BITS])
+	// TODO: parse elf file.
+
+Kernel::Num start ():
+	top_memory = Kernel::get_top_memory ()
+	// Wait for the debugging device to be active, in case there is one.
+	Kernel::schedule ()
+	Directory root = receive_devices ()
+	root.lock_ro ()
+	list_files (root)
+	sort ()
+	pages = new Kernel::Page[max_pages]
+	mapping = alloc_space (max_pages)
+	for unsigned i = 0; i < num_files; ++i:
+		run (files[i])
+	root.unlock_ro ()
+	return 0

devices.hhp

@@ -226,7 +226,7 @@ struct Directory : public Kernel::Cap:
 	// Get the number of entries in this directory.
 	Kernel::Num get_size ():
 		return call (CAP_MASTER_DIRECT | GET_SIZE)
-	// Get the filename.  The return value is the size of the string, the page is filled with the string itself.
+	// Get the filename.
 	String get_name (Kernel::Num idx):
 		icall (CAP_MASTER_DIRECT | GET_NAME, idx)
 		return Kernel::get_arg ()

iris.hhp

@@ -42,8 +42,8 @@
 #define CAPTYPE_THREAD 0x600
 #define CAPTYPE_PAGE 0x800
 #define CAPTYPE_CAPS 0xa00
-//#define CAPTYPE_??? 0xc00
+#define CAPTYPE_LIST 0xc00
-//#define CAPTYPE_??? 0xe00
+#define CAPTYPE_LISTITEM 0xe00
 
 // All kernel capabilities have a master capability, which can create others.
 #define CAP_MASTER 0
@@ -130,6 +130,7 @@ namespace Kernel:
 	struct Thread
 	struct Page
 	struct Memory
+	struct List
 
 	void print_caps ()
 	unsigned alloc_slot ()
@@ -428,6 +429,46 @@ namespace Kernel:
 		void alloc_physical (unsigned address, bool cachable, bool freeable):
 			my_thread.ocall (*this, CAP_MASTER_DIRECT | Thread::PRIV_ALLOC_PHYSICAL, (address & PAGE_MASK) | (cachable ? 1 : 0) | (freeable ? 2 : 0))
 
+	struct Listitem : public Cap:
+		Listitem (Cap c = Cap ()) : Cap (c):
+		enum request:
+			REMOVE = CAPTYPE_LISTITEM + 1
+			CLEAR
+			SET_CAP
+			ADD
+		void remove ():
+			call (CAP_MASTER_DIRECT | REMOVE)
+		void clear ():
+			call (CAP_MASTER_DIRECT | CLEAR)
+		void set_cap (Cap c):
+			call (CAP_MASTER_DIRECT | SET_CAP, c.code)
+		// ADD is called by the kernel on non-listitem objects which are added to a list, to allow virtualization.
+		// Also, to add a listitem to a list, the listitem capability must be of type ADD or MASTER.
+
+	struct List : public Cap:
+		List (Cap c = Cap ()) : Cap (c):
+		enum request:
+			GET_NEXT = CAPTYPE_LIST + 1
+			SET_EMPTY_CB
+			ADD_ITEM
+			GET_INFO
+			SET_INFO
+			GET_CAP
+		Listitem get_next (Listitem current = Listitem ()):
+			icall (current, CAP_MASTER_DIRECT | GET_NEXT)
+			return get_arg ()
+		void set_empty_cb (Cap cb):
+			ocall (cb, CAP_MASTER_DIRECT | SET_EMPTY_CB)
+		void add_item (Listitem item):
+			ocall (item, CAP_MASTER_DIRECT | ADD_ITEM)
+		Num get_info (Listitem item):
+			return ocall (item, CAP_MASTER_DIRECT | GET_INFO)
+		void set_info (Listitem item, Num info):
+			ocall (item, CAP_MASTER_DIRECT | SET_INFO, info)
+		Cap get_cap (Listitem item):
+			iocall (item, CAP_MASTER_DIRECT | GET_CAP)
+			return get_arg ()
+
 	struct Memory : public Cap:
 		Memory (unsigned slot, unsigned idx) : Cap (slot, idx):
 		Memory (Cap c = Cap ()) : Cap (c):
@@ -454,6 +495,12 @@ namespace Kernel:
 		Caps create_caps (unsigned size):
 			icall (Num (CAP_MASTER_DIRECT | CREATE, CAPTYPE_CAPS), size)
 			return get_arg ()
+		List create_list ():
+			icall (Num (CAP_MASTER_DIRECT | CREATE, CAPTYPE_LIST))
+			return get_arg ()
+		Listitem create_listitem ():
+			icall (Num (CAP_MASTER_DIRECT | CREATE, CAPTYPE_LISTITEM))
+			return get_arg ()
 		void destroy (Cap target):
 			ocall (target, CAP_MASTER_DIRECT | DESTROY)
 		// TODO: LIST
@@ -464,7 +511,7 @@ namespace Kernel:
 		Page mapping (void *address):
 			icall (CAP_MASTER_DIRECT | MAPPING, Num ((unsigned)address))
 			return get_arg ()
-		unsigned get_limit (unsigned limit):
+		unsigned get_limit ():
 			return call (CAP_MASTER_DIRECT | GET_LIMIT).l
 		void set_limit (unsigned limit):
 			call (CAP_MASTER_DIRECT | SET_LIMIT, limit)

kernel.hhp

@@ -36,6 +36,8 @@ struct kReceiver
 struct kCapability
 struct kCaps
 struct kMemory
+struct kList
+struct kListitem
 
 // Some functions which must be defined early.
 extern "C":
@@ -58,6 +60,8 @@ typedef kReceiver *kReceiverP
 typedef kCapability *kCapabilityP
 typedef kCaps *kCapsP
 typedef kMemory *kMemoryP
+typedef kList *kListP
+typedef kListitem *kListitemP
 typedef void *kPointer
 
 struct kCapRef:
@@ -183,12 +187,25 @@ struct kMessage : public kObject:
 	// This is a real Caps of two elements, not a link.
 	kCaps caps
 
+struct kListitem : public kObject:
+	kListitemP prev_item, next_item
+	kThreadP owner
+	unsigned cap
+	Kernel::Num info
+
+struct kList : public kObject:
+	kListitemP first_item
+	kThreadP owner
+	unsigned cb
+
 struct kMemory : public kObject:
 	kFree *frees
 	kPageP pages
 	kThreadP threads
 	kReceiverP receivers
 	kCapsP capses
+	kListP lists
+	kListitemP listitems
 	kMemoryP memories
 	unsigned limit, used
 	kMemory_arch arch