first cut: establishes base helper classes and main

boot_mode.cc

+// Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+// Relies on underlying platform classes to determine the system state.
+// In particular, this class orders the current active firmware,
+// developer mode switch value, and the bootloader kernel commandline
+// boot parameter to determine the "boot mode".
+
+#include <sys/types.h>
+
+#include "active_main_firmware.h"
+#include "bootloader_type.h"
+#include "developer_switch.h"
+
+#include "boot_mode.h"
+
+namespace cros_boot_mode {
+
+const char *BootMode::kBootModeText[] = {
+ "normal",
+ "developer",
+ "normal recovery",
+ "developer recovery",
+};
+const size_t BootMode::kBootModeCount =
+  sizeof(kBootModeText) / sizeof(*kBootModeText);
+
+BootMode::BootMode() :
+  mode_(kUnsupported),
+  developer_switch_(&default_developer_switch_),
+  active_main_firmware_(&default_active_main_firmware_),
+  bootloader_type_(&default_bootloader_type_) { }
+BootMode::~BootMode()  { }
+
+void BootMode::Initialize(bool unsupported_is_developer, bool use_bootloader) {
+  if (use_bootloader) {
+    // For now, we treat the bootloader mode as priority over the
+    // firmware-supplied values.  This allows for the kernel commandline to
+    // allow testing different behaviors changing only the kernel and not
+    // the switch positions or system image.
+    bootloader_type_->Initialize();
+    // TODO(wad) potentially create a standalone debug mode. TBD.
+    if (bootloader_type_->value() == BootloaderType::kDebug) {
+      mode_ = kDeveloper;
+      return;
+    }
+    if (bootloader_type_->value() != BootloaderType::kChromeOS) {
+      if (unsupported_is_developer)
+        mode_ = kDeveloper;
+      return;
+    }
+  }
+
+  // After the bootloader, the developer switch position guides the primary
+  // decision around current mode.
+  developer_switch_->Initialize();
+  switch (developer_switch_->value()) {
+    case PlatformSwitch::kEnabled:
+      mode_ = kDeveloper;
+      break;
+    case PlatformSwitch::kDisabled:
+      mode_ = kNormal;
+      break;
+    default:
+      // If we're using the bootloader, rely on it if there's no dev switch.
+      if (use_bootloader)
+        return;
+      // Otherwise, a missing dev switch can be mapped to developer.
+      if (unsupported_is_developer)
+        mode_ = kDeveloper;
+      return;
+  }
+
+  // The sub-mode of "recovery" can be determined by checking if the firmware
+  // booted via the recovery firmware.
+  active_main_firmware_->Initialize();
+  if (active_main_firmware_->value() == ActiveMainFirmware::kRecovery) {
+    if (mode_ == kNormal) {
+      mode_ = kNormalRecovery;
+    } else if (mode_ == kDeveloper) {
+      mode_ = kDeveloperRecovery;
+    }
+  }
+  return;
+}
+
+
+void BootMode::set_developer_switch(DeveloperSwitch *ds) {
+  if (ds)
+    developer_switch_ = ds;
+  else
+    developer_switch_ = &default_developer_switch_;
+}
+
+void BootMode::set_active_main_firmware(ActiveMainFirmware *amf) {
+ if (amf)
+   active_main_firmware_ = amf;
+  else
+   active_main_firmware_ = &default_active_main_firmware_;
+}
+
+void BootMode::set_bootloader_type(BootloaderType *bt) {
+  if (bt)
+    bootloader_type_ = bt;
+  else
+    bootloader_type_ = &default_bootloader_type_;
+}
+
+}  // namespace cros_boot_mode