syscall: Add provideFile, provideHook and provideDirHook and mkdir stub

2 files changed, 111 insertions, 7 deletions

diff --git a/src/lib/syscall.zig b/src/lib/syscall.zig
index 07c62fd..eece736 100644
--- a/src/lib/syscall.zig
+++ b/src/lib/syscall.zig
@@ -18,7 +18,11 @@ pub fn handle(trap_frame: *trap.Frame) !void {
         100001 => open(trap_frame),
         100002 => close(trap_frame),
         100003 => provideStream(trap_frame),
-        100004 => remove(trap_frame),
+        100004 => provideFile(trap_frame),
+        100005 => provideHook(trap_frame),
+        100006 => mkdir(trap_frame),
+        100007 => provideDirHook(trap_frame),
+        100008 => remove(trap_frame),
         else => return Error.UnknownSyscall,
     }
 }
@@ -56,7 +60,7 @@ fn close(trap_frame: *const trap.Frame) void {
 //     path: [*:0]const u8, // fixme: Kernel panic if null pointer
 //     readFn: ?vfs.Stream.ReadFn,
 //     writeFn: ?vfs.Stream.WriteFn,
-// ) Result(usize)
+// ) Result(void)
 fn provideStream(trap_frame: *trap.Frame) void {
     const path: [*:0]const u8 = @ptrFromInt(trap_frame.general_purpose_registers[10]);
     const readFn: ?vfs.Stream.ReadFn = @ptrFromInt(trap_frame.general_purpose_registers[11]);
@@ -70,6 +74,79 @@ fn provideStream(trap_frame: *trap.Frame) void {
     }));
 }
 
+// provideFile(
+//     path: [*:0]const u8, // fixme: Kernel panic if null pointer
+//     openFn: vfs.File.OpenFn,
+//     readFn: ?vfs.File.ReadFn,
+//     writeFn: ?vfs.File.WriteFn,
+//     closeFn: ?vfs.File.CloseFn,
+// ) Result(void)
+fn provideFile(trap_frame: *trap.Frame) void {
+    const path: [*:0]const u8 = @ptrFromInt(trap_frame.general_purpose_registers[10]);
+    const openFn: vfs.File.OpenFn = @ptrFromInt(trap_frame.general_purpose_registers[11]);
+    const readFn: ?vfs.File.ReadFn = @ptrFromInt(trap_frame.general_purpose_registers[12]);
+    const writeFn: ?vfs.File.WriteFn = @ptrFromInt(trap_frame.general_purpose_registers[13]);
+    const closeFn: ?vfs.File.CloseFn = @ptrFromInt(trap_frame.general_purpose_registers[14]);
+
+    sysexchange.frameReturn(trap_frame, vfs.provideResourceZ(path, .{
+        .file = .{
+            .openFn = openFn,
+            .readFn = readFn,
+            .writeFn = writeFn,
+            .closeFn = closeFn,
+        },
+    }));
+}
+
+// provideHook(
+//     path: [*:0]const u8, // fixme: Kernel panic if null pointer
+//     callback: vfs.Hook.Callback,
+// ) Result(void)
+fn provideHook(trap_frame: *trap.Frame) void {
+    const path: [*:0]const u8 = @ptrFromInt(trap_frame.general_purpose_registers[10]);
+    const callback: vfs.Hook.Callback = @ptrFromInt(trap_frame.general_purpose_registers[11]);
+
+    sysexchange.frameReturn(trap_frame, vfs.provideResourceZ(path, .{
+        .hook = .{
+            .callback = callback,
+        },
+    }));
+}
+
+// mkdir(
+//     path: [*:0]const u8, // fixme: Kernel panic if null pointer
+//     options: vfs.MkdirOptions,
+// ) Result(void)
+fn mkdir(trap_frame: *trap.Frame) void {
+    const path: [*:0]const u8 = @ptrFromInt(trap_frame.general_purpose_registers[10]);
+    const options: vfs.MkdirOptions = @bitCast(trap_frame.general_purpose_registers[11]);
+
+    _ = path;
+    _ = options;
+    unreachable;
+}
+
+// provideDirHook(
+//     path: [*:0]const u8, // fixme: Kernel panic if null pointer
+//     provideFn: vfs.DirHook.ProvideFn,
+//     findFn: vfs.DirHook.FindFn,
+//     removeFn: vfs.DirHook.RemoveFn,
+// ) Result(void)
+fn provideDirHook(trap_frame: *trap.Frame) void {
+    const path: [*:0]const u8 = @ptrFromInt(trap_frame.general_purpose_registers[10]);
+    const provideFn: vfs.DirHook.ProvideFn = @ptrFromInt(trap_frame.general_purpose_registers[11]);
+    const findFn: vfs.DirHook.FindFn = @ptrFromInt(trap_frame.general_purpose_registers[12]);
+    const removeFn: vfs.DirHook.RemoveFn = @ptrFromInt(trap_frame.general_purpose_registers[13]);
+
+    sysexchange.frameReturn(trap_frame, vfs.provideResourceZ(path, .{
+        .dir_hook = .{
+            .provideFn = provideFn,
+            .findFn = findFn,
+            .removeFn = removeFn,
+        },
+    }));
+}
+
 // remove(path: [*:0]const u8) Result(usize) // fixme: Kernel panic if null pointer
 fn remove(trap_frame: *const trap.Frame) void {
     const path: [*:0]const u8 = @ptrFromInt(trap_frame.general_purpose_registers[10]);
diff --git a/src/lib/vfs.zig b/src/lib/vfs.zig
index c324c48..798813f 100644
--- a/src/lib/vfs.zig
+++ b/src/lib/vfs.zig
@@ -22,18 +22,45 @@ pub const Stream = struct {
     readFn: ?ReadFn,
     writeFn: ?WriteFn,
 
-    pub const ReadFn = *const fn (context: u16, buffer: []u8) sysexchange.Result(usize);
-    pub const WriteFn = *const fn (context: u16, bytes: []const u8) sysexchange.Result(usize);
+    pub const ReadFn = *const fn (buffer: []u8) sysexchange.Result(usize);
+    pub const WriteFn = *const fn (bytes: []const u8) sysexchange.Result(usize);
 };
 
 // A file is a resource that creates a unique data stream with a driver.
-pub const File = struct {};
+pub const File = struct {
+    openFn: OpenFn,
+    readFn: ?ReadFn,
+    writeFn: ?WriteFn,
+    closeFn: ?CloseFn,
+
+    pub const OpenFn = *allowzero const fn (pid: u16) sysexchange.Result(*anyopaque);
+    pub const ReadFn = *const fn (context: *anyopaque, buffer: []u8) sysexchange.Result(usize);
+    pub const WriteFn = *const fn (context: *anyopaque, bytes: []const u8) sysexchange.Result(usize);
+    pub const CloseFn = *const fn (context: *anyopaque) void;
+};
 
 // A hook is a resource that invokes raw driver callbacks when interacted with.
-pub const Hook = struct {};
+pub const Hook = struct {
+    callback: Callback,
+
+    pub const Callback = *allowzero const fn (pid: u16, data: usize) sysexchange.Result(usize);
+};
+
+pub const MkdirOptions = packed struct(usize) {
+    full: u1,
+    reserved: u63,
+};
 
 // A directory hook is a resource that provides other resources via driver callbacks.
-pub const DirHook = struct {};
+pub const DirHook = struct {
+    provideFn: ProvideFn,
+    findFn: FindFn,
+    removeFn: RemoveFn,
+
+    pub const ProvideFn = *allowzero const fn (inode: Inode) sysexchange.Result(void);
+    pub const FindFn = *allowzero const fn (name: []const u8) ?Inode;
+    pub const RemoveFn = *allowzero const fn (name: []const u8) sysexchange.Result(void);
+};
 
 pub const Resource = union(enum) {
     stream: Stream,