Add filesystem driver

src/os/src/kernel/drivers/dev/pci.ts

@@ -1,6 +1,8 @@
 import { dwordin, dwordout } from "../../../lib/libts/dword";
 import { portin, portout } from "../../../lib/libts/port";
 import { Logger } from "../../../lib/libstd/logger/logger.kmod";
+import { sysfs_mkdir, sysfs_writeFile } from "../../filesystem/sysfs";
+import { Path } from "../../../lib/libstd/path";
 
 const KDRIVER_PCI_CONFIG_ADDR = 0xcf8;
 const KDRIVER_PCI_CONFIG_DATA = 0xcfc;
@@ -37,13 +39,11 @@ export function kdriver_dev_pci_checkDevice(
   const classCode = kdriver_dev_pci_getClassCode(bus, device, func);
   const subclass = kdriver_dev_pci_getSubclass(bus, device, func);
 
+  const filename = bus + ":" + device + ":" + func;
+
   Logger.log(
     "[PCI] Found device pci:" +
-      bus +
-      ":" +
-      device +
-      ":" +
-      func +
+      filename +
       " (vendor:" +
       vendorId.toString(16) +
       ", device:" +
@@ -54,6 +54,14 @@ export function kdriver_dev_pci_checkDevice(
       subclass.toString(16) +
       ")"
   );
+
+  const dirname = Path.join("/pci", filename);
+
+  sysfs_mkdir(dirname);
+  sysfs_writeFile(Path.join(dirname, "vendor"), vendorId);
+  sysfs_writeFile(Path.join(dirname, "device"), deviceId);
+  sysfs_writeFile(Path.join(dirname, "class"), classCode);
+  sysfs_writeFile(Path.join(dirname, "subclass"), subclass);
 }
 
 export function kdriver_dev_pci_getDeviceId(

src/os/src/kernel/filesystem/sysfs.ts

@@ -0,0 +1,138 @@
+import { Logger } from "../../lib/libstd/logger/logger.kmod";
+import { Path } from "../../lib/libstd/path";
+import type {
+  KFilesystemDriver,
+  KFilesystemEntity,
+  KFilesystemMemdata,
+  KFilesystemStat,
+} from "../../types/filesystem/fs";
+
+const sysfs_data: KFilesystemMemdata = [];
+
+export function sysfs_driver(): KFilesystemDriver {
+  return {
+    id: "sysfs",
+    init: sysfs_init,
+    listDir(path: string): KFilesystemEntity[] | null {
+      return sysfs_listDir(path);
+    },
+    readFile(path: string): unknown {
+      return sysfs_readFile(path);
+    },
+    writeFile(path: string, content: unknown): void {
+      throw new Error("Cannot write to sysfs files.");
+    },
+    createFile(path: string, content: unknown): void {
+      throw new Error("Cannot create files in sysfs.");
+    },
+    mkdir(path: string): void {
+      throw new Error("Cannot create directories in sysfs.");
+    },
+    stat(path: string): KFilesystemStat | null {
+      return sysfs_statEntity(path);
+    },
+  };
+}
+
+export function sysfs_init(): void {
+  sysfs_data.push({
+    name: "root",
+    path: "/",
+    type: "folder",
+    size: 0,
+    contents: null,
+  });
+
+  sysfs_mkdir("/pci");
+}
+
+export function sysfs_getEntity(path: string): KFilesystemEntity | null {
+  for (let i = 0; i < sysfs_data.length; i++) {
+    const entity = sysfs_data[i]!;
+
+    if (entity.path === path) return entity;
+  }
+
+  return null;
+}
+
+export function sysfs_statEntity(path: string): KFilesystemStat | null {
+  const entity = sysfs_getEntity(path);
+  if (!entity) return null;
+
+  return {
+    name: entity.name,
+    type: entity.type,
+    size: entity.size,
+  };
+}
+
+export function sysfs_mkdir(path: string): void {
+  if (sysfs_getEntity(path)) return;
+
+  const parent = Path.dirname(path);
+  if (!sysfs_getEntity(parent)) return;
+
+  sysfs_data.push({
+    name: Path.filename(path),
+    path,
+    type: "folder",
+    size: 0,
+    contents: null,
+  });
+}
+
+export function sysfs_createFile(path: string, content: unknown): void {
+  if (sysfs_getEntity(path)) return;
+
+  const parent = Path.dirname(path);
+  if (!sysfs_getEntity(parent)) return;
+
+  const size = String(content).length;
+
+  sysfs_data.push({
+    name: Path.filename(path),
+    path,
+    type: "file",
+    size,
+    contents: content,
+  });
+}
+
+export function sysfs_writeFile(path: string, content: unknown): void {
+  const entity = sysfs_getEntity(path);
+  if (!entity) return sysfs_createFile(path, content);
+
+  if (entity.type !== "file") return;
+
+  entity.contents = content;
+  entity.size = String(content).length;
+}
+
+export function sysfs_readFile(path: string): unknown {
+  const entity = sysfs_getEntity(path);
+  if (!entity) return null;
+
+  if (entity.type !== "file") return null;
+
+  return entity.contents;
+}
+
+export function sysfs_listDir(path: string): KFilesystemEntity[] | null {
+  const entity = sysfs_getEntity(path);
+  if (!entity) return null;
+
+  if (entity.type !== "folder") return null;
+
+  const contents: KFilesystemEntity[] = [];
+
+  for (let i = 0; i < sysfs_data.length; i++) {
+    const e = sysfs_data[i]!;
+
+    if (Path.dirname(e.path) === path) {
+      contents.push(e);
+    }
+  }
+
+  return contents;
+}

src/os/src/kernel/index.ts

@@ -7,10 +7,16 @@ import {
   kdriver_etc_serial_read,
   kdriver_etc_serial_transmit,
 } from "./drivers/etc/serial";
+import { sysfs_driver, sysfs_readFile } from "./filesystem/sysfs";
 import {
   kmod_drivers_init,
   kmod_drivers_register,
 } from "./modules/drivers/drivers.kmod";
+import {
+  kmod_filesystem_init,
+  kmod_filesystem_mount,
+  kmod_filesystem_readFile,
+} from "./modules/filesystem/filesystem.kmod";
 import {
   kmod_graphics_vga_clear,
   kmod_graphics_vga_init,
@@ -23,11 +29,18 @@ export function kmain() {
   kmod_drivers_register();
   Logger.log("[Kernel] Drivers initialized.");
 
-  Logger.log("[Kernel] Initializing PCI...");
+  Logger.log("[Kernel] Initializing filesystem module...");
+  kmod_filesystem_init();
+  kmod_filesystem_mount("/sys", sysfs_driver);
+
+  Logger.log("[Kernel] Initializing PCI devices...");
   kdriver_dev_pci_detectDevices();
 
   Logger.log("[Kernel] Initializing VGA module...");
   kmod_graphics_vga_init();
   kmod_graphics_vga_pushLine("[Kernel] Kernel initialized successfully.");
   kmod_graphics_vga_pushLine("Current date: " + getDate().toDateString());
+  kmod_graphics_vga_pushLine(
+    Number(kmod_filesystem_readFile("/sys/pci/0:1:0/vendor")).toString(16)
+  );
 }

src/os/src/kernel/modules/filesystem/filesystem.kmod.ts

@@ -0,0 +1,111 @@
+import { Logger } from "../../../lib/libstd/logger/logger.kmod";
+import type {
+  KFilesystemDriver,
+  KFilesystemEntity,
+  KFilesystemMount,
+  KFilesystemMountdata,
+  KFilesystemStat,
+} from "../../../types/filesystem/fs";
+
+const kmod_filesystem_data: KFilesystemMountdata = [];
+
+export function kmod_filesystem_init(): void {}
+
+export function kmod_filesystem_mount(
+  mpoint: string,
+  drv: () => KFilesystemDriver
+): void {
+  const driver = drv();
+
+  driver.init();
+
+  kmod_filesystem_data.push({
+    mountpoint: mpoint,
+    driver: driver,
+  });
+
+  Logger.log("[Filesystem] Mounted " + driver.id + " at " + mpoint);
+}
+
+export function kmod_filesystem_findMount(p: string): KFilesystemMount | null {
+  for (let i = 0; i < kmod_filesystem_data.length; i++) {
+    const mount = kmod_filesystem_data[i]!;
+
+    if (p.startsWith(mount.mountpoint)) {
+      return mount;
+    }
+  }
+
+  return null;
+}
+
+export function kmod_filesystem_stripMountpoint(
+  mount: KFilesystemMount,
+  p: string
+): string {
+  if (mount.mountpoint === "/") return p;
+
+  return p.slice(mount.mountpoint.length) || "/";
+}
+
+export function kmod_filesystem_listDir(
+  path: string
+): KFilesystemEntity[] | null {
+  const mount = kmod_filesystem_findMount(path);
+  if (!mount) return null;
+
+  const strippedPath = kmod_filesystem_stripMountpoint(mount, path);
+
+  return mount.driver.listDir(strippedPath);
+}
+
+export function kmod_filesystem_readFile(path: string): unknown {
+  const mount = kmod_filesystem_findMount(path);
+  if (!mount) return null;
+
+  const strippedPath = kmod_filesystem_stripMountpoint(mount, path);
+
+  return mount.driver.readFile(strippedPath);
+}
+
+export function kmod_filesystem_writeFile(
+  path: string,
+  content: unknown
+): void {
+  const mount = kmod_filesystem_findMount(path);
+  if (!mount) return;
+
+  const strippedPath = kmod_filesystem_stripMountpoint(mount, path);
+
+  mount.driver.writeFile(strippedPath, content);
+}
+
+export function kmod_filesystem_createFile(
+  path: string,
+  content: unknown
+): void {
+  const mount = kmod_filesystem_findMount(path);
+  if (!mount) return;
+
+  const strippedPath = kmod_filesystem_stripMountpoint(mount, path);
+
+  mount.driver.createFile(strippedPath, content);
+}
+
+export function kmod_filesystem_mkdir(path: string): void {
+  const mount = kmod_filesystem_findMount(path);
+  if (!mount) return;
+
+  const strippedPath = kmod_filesystem_stripMountpoint(mount, path);
+
+  mount.driver.mkdir(strippedPath);
+}
+
+export function kmod_filesystem_stat(path: string): KFilesystemStat | null {
+  const mount = kmod_filesystem_findMount(path);
+  if (!mount) return null;
+
+  const strippedPath = kmod_filesystem_stripMountpoint(mount, path);
+
+  return mount.driver.stat(strippedPath);
+}

src/os/src/lib/libstd/path.ts

@@ -0,0 +1,30 @@
+export const Path = {
+  dirname(p: string): string {
+    const parts = p.split("/");
+
+    parts.pop();
+
+    if (parts.length <= 1) return "/";
+
+    return parts.join("/");
+  },
+  filename(p: string): string {
+    const parts = p.split("/");
+
+    const n = parts.pop();
+
+    if (!n) return "";
+    return n;
+  },
+  join(p1: string, p2: string): string {
+    if (p1.endsWith("/")) {
+      p1 = p1.slice(0, -1);
+    }
+
+    if (p2.startsWith("/")) {
+      p2 = p2.slice(1);
+    }
+
+    return p1 + "/" + p2;
+  },
+};

src/os/src/types/filesystem/fs.ts

@@ -0,0 +1,33 @@
+export type KFilesystemMountdata = KFilesystemMount[];
+
+export type KFilesystemMount = {
+  mountpoint: string;
+  driver: KFilesystemDriver;
+};
+
+export type KFilesystemDriver = {
+  id: string;
+  init: () => void;
+  listDir(path: string): KFilesystemEntity[] | null;
+  readFile(path: string): unknown;
+  writeFile(path: string, content: unknown): void;
+  createFile(path: string, content: unknown): void;
+  mkdir(path: string): void;
+  stat(path: string): KFilesystemStat | null;
+};
+
+export type KFilesystemMemdata = KFilesystemEntity[];
+
+export type KFilesystemEntity = {
+  name: string;
+  path: string;
+  size: number;
+  contents: unknown;
+  type: "file" | "folder";
+};
+
+export type KFilesystemStat = {
+  name: string;
+  type: "file" | "folder";
+  size: number;
+};