diff --git a/core/modules/system/lib/Drupal/system/Form/ModulesListForm.php b/core/modules/system/lib/Drupal/system/Form/ModulesListForm.php
new file mode 100644
index 0000000..5f86951
--- /dev/null
+++ b/core/modules/system/lib/Drupal/system/Form/ModulesListForm.php
@@ -0,0 +1,452 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\system\Form\ModulesListForm.
+ */
+
+namespace Drupal\system\Form;
+
+use Drupal\Core\ControllerInterface;
+use Drupal\Core\Form\FormInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+class ModulesListForm implements FormInterface, ControllerInterface {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container) {
+    return new static();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function __construct() {
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getFormID() {
+    return 'system_modules';
+  }
+
+  /**
+   * Form builder; provides module enable/disable interface.
+   *
+   * The list of modules gets populated by module.info.yml files, which contain
+   * each module's name, description, and information about which modules it
+   * requires.
+   * See drupal_parse_info_file() for infos on module.info.yml descriptors.
+   *
+   * Dependency checking is performed to ensure that a module:
+   * - can not be enabled if there are disabled modules it requires.
+   * - can not be disabled if there are enabled modules which depend on it.
+   *
+   * {@inheritdoc}
+   *
+   * @return
+   *   The form array.
+   *
+   * @ingroup forms
+   * @see theme_system_modules()
+   */
+  public function buildForm(array $form, array &$form_state) {
+    // Get current list of modules.
+    $files = system_rebuild_module_data();
+
+    // Remove hidden modules from display list.
+    $visible_files = $files;
+    foreach ($visible_files as $filename => $file) {
+      if (!empty($file->info['hidden'])) {
+        unset($visible_files[$filename]);
+      }
+    }
+
+    \Drupal::moduleHandler()->loadInclude('system', 'inc', 'system.admin');
+    uasort($visible_files, 'system_sort_modules_by_info_name');
+
+    // If the modules form was submitted, then submitForm() runs first and if
+    // there are unfilled required modules, then $form_state['storage'] is
+    // filled, triggering a rebuild. In this case we need to display a
+    // confirmation form.
+    if (!empty($form_state['storage'])) {
+      return system_modules_confirm_form($visible_files, $form_state['storage']);
+    }
+
+    // JS-only table filters.
+    $form['filters'] = array(
+      '#type' => 'container',
+      '#attributes' => array(
+        'class' => array('table-filter', 'js-show'),
+      ),
+    );
+    $form['filters']['text'] = array(
+      '#type' => 'search',
+      '#title' => t('Search'),
+      '#size' => 30,
+      '#placeholder' => t('Enter module name…'),
+      '#attributes' => array(
+        'class' => array('table-filter-text'),
+        'data-table' => '#system-modules',
+        'autocomplete' => 'off',
+        'title' => t('Enter a part of the module name or description to filter by.'),
+      ),
+    );
+
+    $modules = array();
+    $form['modules'] = array('#tree' => TRUE);
+
+    // Used when checking if module implements a help page.
+    $help_arg = module_exists('help') ? drupal_help_arg() : FALSE;
+
+    // Used when displaying modules that are required by the installation profile.
+    require_once DRUPAL_ROOT . '/core/includes/install.inc';
+    $distribution_name = check_plain(drupal_install_profile_distribution_name());
+
+    // Iterate through each of the modules.
+    foreach ($visible_files as $filename => $module) {
+      $extra = array();
+      $extra['enabled'] = (bool) $module->status;
+      if (!empty($module->info['required'] )) {
+        $extra['disabled'] = TRUE;
+        $extra['required_by'][] = $distribution_name . (!empty($module->info['explanation']) ? ' ('. $module->info['explanation'] .')' : '');
+      }
+
+      // If this module requires other modules, add them to the array.
+      foreach ($module->requires as $requires => $v) {
+        if (!isset($files[$requires])) {
+          $extra['requires'][$requires] = t('@module (<span class="admin-missing">missing</span>)', array('@module' => drupal_ucfirst($requires)));
+          $extra['disabled'] = TRUE;
+        }
+        // Only display visible modules.
+        elseif (isset($visible_files[$requires])) {
+          $requires_name = $files[$requires]->info['name'];
+          // Disable this module if it is incompatible with the dependency's version.
+          if ($incompatible_version = drupal_check_incompatibility($v, str_replace(DRUPAL_CORE_COMPATIBILITY . '-', '', $files[$requires]->info['version']))) {
+            $extra['requires'][$requires] = t('@module (<span class="admin-missing">incompatible with</span> version @version)', array(
+              '@module' => $requires_name . $incompatible_version,
+              '@version' => $files[$requires]->info['version'],
+            ));
+            $extra['disabled'] = TRUE;
+          }
+          // Disable this module if the dependency is incompatible with this
+          // version of Drupal core.
+          elseif ($files[$requires]->info['core'] != DRUPAL_CORE_COMPATIBILITY) {
+            $extra['requires'][$requires] = t('@module (<span class="admin-missing">incompatible with</span> this version of Drupal core)', array(
+              '@module' => $requires_name,
+            ));
+            $extra['disabled'] = TRUE;
+          }
+          elseif ($files[$requires]->status) {
+            $extra['requires'][$requires] = t('@module', array('@module' => $requires_name));
+          }
+          else {
+            $extra['requires'][$requires] = t('@module (<span class="admin-disabled">disabled</span>)', array('@module' => $requires_name));
+          }
+        }
+      }
+      // Generate link for module's help page, if there is one.
+      if ($help_arg && $module->status && in_array($filename, module_implements('help'))) {
+        if (module_invoke($filename, 'help', "admin/help#$filename", $help_arg)) {
+          $extra['links']['help'] = array(
+            '#type' => 'link',
+            '#title' => t('Help'),
+            '#href' => "admin/help/$filename",
+            '#options' => array('attributes' => array('class' =>  array('module-link', 'module-link-help'), 'title' => t('Help'))),
+          );
+        }
+      }
+      // Generate link for module's permission, if the user has access to it.
+      if ($module->status && user_access('administer permissions') && in_array($filename, module_implements('permission'))) {
+        $extra['links']['permissions'] = array(
+          '#type' => 'link',
+          '#title' => t('Permissions'),
+          '#href' => 'admin/people/permissions',
+          '#options' => array('fragment' => 'module-' . $filename, 'attributes' => array('class' => array('module-link', 'module-link-permissions'), 'title' => t('Configure permissions'))),
+        );
+      }
+      // Generate link for module's configuration page, if the module provides
+      // one.
+      if ($module->status && isset($module->info['configure'])) {
+        $configure_link = menu_get_item($module->info['configure']);
+        if ($configure_link['access']) {
+          $extra['links']['configure'] = array(
+            '#type' => 'link',
+            '#title' => t('Configure'),
+            '#href' => $configure_link['href'],
+            '#options' => array('attributes' => array('class' => array('module-link', 'module-link-configure'), 'title' => $configure_link['description'])),
+          );
+        }
+      }
+
+      // If this module is required by other modules, list those, and then make it
+      // impossible to disable this one.
+      foreach ($module->required_by as $required_by => $v) {
+        // Hidden modules are unset already.
+        if (isset($visible_files[$required_by])) {
+          if ($files[$required_by]->status == 1 && $module->status == 1) {
+            $extra['required_by'][] = t('@module', array('@module' => $files[$required_by]->info['name']));
+            $extra['disabled'] = TRUE;
+          }
+          else {
+            $extra['required_by'][] = t('@module (<span class="admin-disabled">disabled</span>)', array('@module' => $files[$required_by]->info['name']));
+          }
+        }
+      }
+      $form['modules'][$module->info['package']][$filename] = $this->buildRow($module->info, $extra);
+    }
+
+    // Add basic information to the details.
+    foreach (element_children($form['modules']) as $package) {
+      $form['modules'][$package] += array(
+        '#type' => 'details',
+        '#title' => t($package),
+        '#theme' => 'system_modules_details',
+        '#header' => array(
+          array('data' => t('<span class="element-invisible">Enabled</span>'), 'class' => array('checkbox')),
+          array('data' => t('Name'), 'class' => array('name')),
+          array('data' => t('Description'), 'class' => array('description', RESPONSIVE_PRIORITY_LOW)),
+        ),
+        // Ensure that the "Core" package comes first.
+        '#weight' => $package == 'Core' ? -10 : NULL,
+      );
+    }
+    // Lastly, sort all packages by title.
+    uasort($form['modules'], 'element_sort_by_title');
+
+    $form['#attached']['library'][] = array('system', 'drupal.system.modules');
+    $form['actions'] = array('#type' => 'actions');
+    $form['actions']['submit'] = array(
+      '#type' => 'submit',
+      '#value' => t('Save configuration'),
+    );
+    $form['#action'] = url('admin/modules/list/confirm');
+
+    return $form;
+  }
+
+  /**
+   * Build a table row for the system modules page.
+   */
+  private function buildRow($info, $extra) {
+    // Add in the defaults.
+    $extra += array(
+      'requires' => array(),
+      'required_by' => array(),
+      'disabled' => FALSE,
+      'enabled' => FALSE,
+      'links' => array(),
+    );
+    $form = array(
+      '#tree' => TRUE,
+    );
+    // Set the basic properties.
+    $form['name'] = array(
+      '#markup' => $info['name'],
+    );
+    $form['description'] = array(
+      '#markup' => t($info['description']),
+    );
+    $form['version'] = array(
+      '#markup' => $info['version'],
+    );
+    $form['#requires'] = $extra['requires'];
+    $form['#required_by'] = $extra['required_by'];
+
+    // Check the compatibilities.
+    $compatible = TRUE;
+    $status_short = '';
+    $status_long = '';
+
+    // Check the core compatibility.
+    if (!isset($info['core']) || $info['core'] != DRUPAL_CORE_COMPATIBILITY) {
+      $compatible = FALSE;
+      $status_short .= t('Incompatible with this version of Drupal core.');
+      $status_long .= t('This version is not compatible with Drupal !core_version and should be replaced.', array('!core_version' => DRUPAL_CORE_COMPATIBILITY));
+    }
+
+    // Ensure this module is compatible with the currently installed version of PHP.
+    if (version_compare(phpversion(), $info['php']) < 0) {
+      $compatible = FALSE;
+      $status_short .= t('Incompatible with this version of PHP');
+      $php_required = $info['php'];
+      if (substr_count($info['php'], '.') < 2) {
+        $php_required .= '.*';
+      }
+      $status_long .= t('This module requires PHP version @php_required and is incompatible with PHP version !php_version.', array('@php_required' => $php_required, '!php_version' => phpversion()));
+    }
+
+    // If this module is compatible, present a checkbox indicating
+    // this module may be installed. Otherwise, show a big red X.
+    if ($compatible) {
+      $form['enable'] = array(
+        '#type' => 'checkbox',
+        '#title' => t('Enable'),
+        '#default_value' => $extra['enabled'],
+        '#attributes' => array('role' => 'disabled'),
+      );
+      if ($extra['disabled']) {
+        $form['enable']['#disabled'] = TRUE;
+      }
+    }
+    else {
+      $form['enable'] = array(
+        '#markup' =>  theme('image', array('uri' => 'core/misc/watchdog-error.png', 'alt' => $status_short, 'title' => $status_short)),
+      );
+      $form['description']['#markup'] .= theme('system_modules_incompatible', array('message' => $status_long));
+    }
+
+    // Build operation links.
+    foreach (array('help', 'permissions', 'configure') as $key) {
+      $form['links'][$key] = (isset($extra['links'][$key]) ? $extra['links'][$key] : array());
+    }
+
+    return $form;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function validateForm(array &$form, array &$form_state) {
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submitForm(array &$form, array &$form_state) {
+    include_once DRUPAL_ROOT . '/core/includes/install.inc';
+
+    // Builds list of modules.
+    $modules = array();
+    // If we're not coming from the confirmation form, build the list of modules.
+    if (empty($form_state['storage'])) {
+      // If we're not coming from the confirmation form, build the module list.
+      foreach ($form_state['values']['modules'] as $group_name => $group) {
+        foreach ($group as $module => $enabled) {
+          $modules[$module] = array('group' => $group_name, 'enabled' => $enabled['enable']);
+        }
+      }
+    }
+    else {
+      // If we are coming from the confirmation form, fetch
+      // the modules out of $form_state.
+      $modules = $form_state['storage']['modules'];
+    }
+
+    // Collect data for all modules to be able to determine dependencies.
+    $files = system_rebuild_module_data();
+
+    // Sorts modules by weight.
+    $sort = array();
+    foreach (array_keys($modules) as $module) {
+      $sort[$module] = $files[$module]->sort;
+    }
+    array_multisort($sort, $modules);
+
+    // Makes sure all required modules are set to be enabled.
+    $more_required = array();
+    $missing_modules = array();
+    foreach ($modules as $name => $module) {
+      if ($module['enabled']) {
+        // Checks that all dependencies are set to be enabled.  Stores the ones
+        // that are not in $dependencies variable so that the user can be alerted
+        // in the confirmation form that more modules need to be enabled.
+        $dependencies = array();
+        foreach (array_keys($files[$name]->requires) as $required) {
+          if (empty($modules[$required]['enabled'])) {
+            if (isset($files[$required])) {
+              $dependencies[] = $files[$required]->info['name'];
+              $modules[$required]['enabled'] = TRUE;
+            }
+            else {
+              $missing_modules[$required]['depends'][] = $name;
+              $modules[$name]['enabled'] = FALSE;
+            }
+          }
+        }
+
+        // Stores additional modules that need to be enabled in $more_required.
+        if (!empty($dependencies)) {
+          $more_required[$name] = array(
+            'name' => $files[$name]->info['name'],
+            'requires' => $dependencies,
+          );
+        }
+      }
+    }
+
+    // Redirects to confirmation form if more modules need to be enabled.
+    if ((!empty($more_required) || !empty($missing_modules)) && !isset($form_state['values']['confirm'])) {
+      $form_state['storage'] = array(
+        'more_required' => $more_required,
+        'modules' => $modules,
+        'missing_modules' => $missing_modules,
+      );
+      $form_state['rebuild'] = TRUE;
+      return;
+    }
+
+    // Invokes hook_requirements('install').  If failures are detected, makes sure
+    // the dependent modules aren't installed either.
+    foreach ($modules as $name => $module) {
+      // Only invoke hook_requirements() on modules that are going to be installed.
+      if ($module['enabled'] && drupal_get_installed_schema_version($name) == SCHEMA_UNINSTALLED) {
+        if (!drupal_check_module($name)) {
+          $modules[$name]['enabled'] = FALSE;
+          foreach (array_keys($files[$name]->required_by) as $required_by) {
+            $modules[$required_by]['enabled'] = FALSE;
+          }
+        }
+      }
+    }
+
+    // Initializes array of actions.
+    $actions = array(
+      'enable' => array(),
+      'disable' => array(),
+      'install' => array(),
+    );
+
+    // Builds arrays of modules that need to be enabled, disabled, and installed.
+    foreach ($modules as $name => $module) {
+      if ($module['enabled']) {
+        if (drupal_get_installed_schema_version($name) == SCHEMA_UNINSTALLED) {
+          $actions['install'][] = $name;
+          $actions['enable'][] = $name;
+        }
+        elseif (!module_exists($name)) {
+          $actions['enable'][] = $name;
+        }
+      }
+      elseif (module_exists($name)) {
+        $actions['disable'][] = $name;
+      }
+    }
+
+    // Gets list of modules prior to install process, unsets $form_state['storage']
+    // so we don't get redirected back to the confirmation form.
+    $pre_install_list = drupal_container()->get('module_handler')->getModuleList();
+    unset($form_state['storage']);
+
+    // Reverse the 'enable' list, to order dependencies before dependents.
+    krsort($actions['enable']);
+
+    // Installs, enables, and disables modules.
+    module_enable($actions['enable'], FALSE);
+    module_disable($actions['disable'], FALSE);
+
+    // Gets module list after install process, flushes caches and displays a
+    // message if there are changes.
+    $post_install_list = drupal_container()->get('module_handler')->getModuleList();
+    if ($pre_install_list != $post_install_list) {
+      drupal_flush_all_caches();
+      drupal_set_message(t('The configuration options have been saved.'));
+    }
+
+    $form_state['redirect'] = 'admin/modules';
+  }
+
+}
diff --git a/core/modules/system/system.admin.inc b/core/modules/system/system.admin.inc
index c6002f9..265965f 100644
--- a/core/modules/system/system.admin.inc
+++ b/core/modules/system/system.admin.inc
@@ -789,203 +789,6 @@ function _system_is_incompatible(&$incompatible, $files, $file) {
 }
 
 /**
- * Menu callback; provides module enable/disable interface.
- *
- * The list of modules gets populated by module.info.yml files, which contain
- * each module's name, description, and information about which modules it
- * requires.
- * See drupal_parse_info_file() for information on module.info.yml descriptors.
- *
- * Dependency checking is performed to ensure that a module:
- * - can not be enabled if there are disabled modules it requires.
- * - can not be disabled if there are enabled modules which depend on it.
- *
- * @param $form_state
- *   An associative array containing the current state of the form.
- *
- * @return
- *   The form array.
- *
- * @ingroup forms
- * @see theme_system_modules()
- * @see system_modules_submit()
- */
-function system_modules($form, $form_state = array()) {
-  // Get current list of modules.
-  $files = system_rebuild_module_data();
-
-  // Remove hidden modules from display list.
-  $visible_files = $files;
-  foreach ($visible_files as $filename => $file) {
-    if (!empty($file->info['hidden'])) {
-      unset($visible_files[$filename]);
-    }
-  }
-
-  uasort($visible_files, 'system_sort_modules_by_info_name');
-
-  // If the modules form was submitted, then system_modules_submit() runs first
-  // and if there are unfilled required modules, then $form_state['storage'] is
-  // filled, triggering a rebuild. In this case we need to display a
-  // confirmation form.
-  if (!empty($form_state['storage'])) {
-    return system_modules_confirm_form($visible_files, $form_state['storage']);
-  }
-
-  // JS-only table filters.
-  $form['filters'] = array(
-    '#type' => 'container',
-    '#attributes' => array(
-      'class' => array('table-filter', 'js-show'),
-    ),
-  );
-  $form['filters']['text'] = array(
-    '#type' => 'search',
-    '#title' => t('Search'),
-    '#size' => 30,
-    '#placeholder' => t('Enter module name…'),
-    '#attributes' => array(
-      'class' => array('table-filter-text'),
-      'data-table' => '#system-modules',
-      'autocomplete' => 'off',
-      'title' => t('Enter a part of the module name or description to filter by.'),
-    ),
-  );
-
-  $modules = array();
-  $form['modules'] = array('#tree' => TRUE);
-
-  // Used when checking if module implements a help page.
-  $help_arg = module_exists('help') ? drupal_help_arg() : FALSE;
-
-  // Used when displaying modules that are required by the installation profile.
-  require_once DRUPAL_ROOT . '/core/includes/install.inc';
-  $distribution_name = check_plain(drupal_install_profile_distribution_name());
-
-  // Iterate through each of the modules.
-  foreach ($visible_files as $filename => $module) {
-    $extra = array();
-    $extra['enabled'] = (bool) $module->status;
-    if (!empty($module->info['required'] )) {
-      $extra['disabled'] = TRUE;
-      $extra['required_by'][] = $distribution_name . (!empty($module->info['explanation']) ? ' ('. $module->info['explanation'] .')' : '');
-    }
-
-    // If this module requires other modules, add them to the array.
-    foreach ($module->requires as $requires => $v) {
-      if (!isset($files[$requires])) {
-        $extra['requires'][$requires] = t('@module (<span class="admin-missing">missing</span>)', array('@module' => drupal_ucfirst($requires)));
-        $extra['disabled'] = TRUE;
-      }
-      // Only display visible modules.
-      elseif (isset($visible_files[$requires])) {
-        $requires_name = $files[$requires]->info['name'];
-        // Disable this module if it is incompatible with the dependency's version.
-        if ($incompatible_version = drupal_check_incompatibility($v, str_replace(DRUPAL_CORE_COMPATIBILITY . '-', '', $files[$requires]->info['version']))) {
-          $extra['requires'][$requires] = t('@module (<span class="admin-missing">incompatible with</span> version @version)', array(
-            '@module' => $requires_name . $incompatible_version,
-            '@version' => $files[$requires]->info['version'],
-          ));
-          $extra['disabled'] = TRUE;
-        }
-        // Disable this module if the dependency is incompatible with this
-        // version of Drupal core.
-        elseif ($files[$requires]->info['core'] != DRUPAL_CORE_COMPATIBILITY) {
-          $extra['requires'][$requires] = t('@module (<span class="admin-missing">incompatible with</span> this version of Drupal core)', array(
-            '@module' => $requires_name,
-          ));
-          $extra['disabled'] = TRUE;
-        }
-        elseif ($files[$requires]->status) {
-          $extra['requires'][$requires] = t('@module', array('@module' => $requires_name));
-        }
-        else {
-          $extra['requires'][$requires] = t('@module (<span class="admin-disabled">disabled</span>)', array('@module' => $requires_name));
-        }
-      }
-    }
-    // Generate link for module's help page, if there is one.
-    if ($help_arg && $module->status && in_array($filename, module_implements('help'))) {
-      if (module_invoke($filename, 'help', "admin/help#$filename", $help_arg)) {
-        $extra['links']['help'] = array(
-          '#type' => 'link',
-          '#title' => t('Help'),
-          '#href' => "admin/help/$filename",
-          '#options' => array('attributes' => array('class' =>  array('module-link', 'module-link-help'), 'title' => t('Help'))),
-        );
-      }
-    }
-    // Generate link for module's permission, if the user has access to it.
-    if ($module->status && user_access('administer permissions') && in_array($filename, module_implements('permission'))) {
-      $extra['links']['permissions'] = array(
-        '#type' => 'link',
-        '#title' => t('Permissions'),
-        '#href' => 'admin/people/permissions',
-        '#options' => array('fragment' => 'module-' . $filename, 'attributes' => array('class' => array('module-link', 'module-link-permissions'), 'title' => t('Configure permissions'))),
-      );
-    }
-    // Generate link for module's configuration page, if the module provides
-    // one.
-    if ($module->status && isset($module->info['configure'])) {
-      $configure_link = menu_get_item($module->info['configure']);
-      if ($configure_link['access']) {
-        $extra['links']['configure'] = array(
-          '#type' => 'link',
-          '#title' => t('Configure'),
-          '#href' => $configure_link['href'],
-          '#options' => array('attributes' => array('class' => array('module-link', 'module-link-configure'), 'title' => $configure_link['description'])),
-        );
-      }
-    }
-
-    // If this module is required by other modules, list those, and then make it
-    // impossible to disable this one.
-    foreach ($module->required_by as $required_by => $v) {
-      // Hidden modules are unset already.
-      if (isset($visible_files[$required_by])) {
-        if ($files[$required_by]->status == 1 && $module->status == 1) {
-          $extra['required_by'][] = t('@module', array('@module' => $files[$required_by]->info['name']));
-          $extra['disabled'] = TRUE;
-        }
-        else {
-          $extra['required_by'][] = t('@module (<span class="admin-disabled">disabled</span>)', array('@module' => $files[$required_by]->info['name']));
-        }
-      }
-    }
-    $form['modules'][$module->info['package']][$filename] = _system_modules_build_row($module->info, $extra);
-  }
-
-  // Add basic information to the details.
-  foreach (element_children($form['modules']) as $package) {
-    $form['modules'][$package] += array(
-      '#type' => 'details',
-      '#title' => t($package),
-      '#theme' => 'system_modules_details',
-      '#header' => array(
-        array('data' => t('<span class="element-invisible">Enabled</span>'), 'class' => array('checkbox')),
-        array('data' => t('Name'), 'class' => array('name')),
-        array('data' => t('Description'), 'class' => array('description', RESPONSIVE_PRIORITY_LOW)),
-      ),
-      // Ensure that the "Core" package comes first.
-      '#weight' => $package == 'Core' ? -10 : NULL,
-    );
-  }
-
-  // Lastly, sort all packages by title.
-  uasort($form['modules'], 'element_sort_by_title');
-
-  $form['#attached']['library'][] = array('system', 'drupal.system.modules');
-  $form['actions'] = array('#type' => 'actions');
-  $form['actions']['submit'] = array(
-    '#type' => 'submit',
-    '#value' => t('Save configuration'),
-  );
-  $form['#action'] = url('admin/modules/list/confirm');
-
-  return $form;
-}
-
-/**
  * Array sorting callback; sorts modules or themes by their name.
  */
 function system_sort_modules_by_info_name($a, $b) {
@@ -1006,85 +809,6 @@ function system_sort_themes($a, $b) {
 }
 
 /**
- * Build a table row for the system modules page.
- */
-function _system_modules_build_row($info, $extra) {
-  // Add in the defaults.
-  $extra += array(
-    'requires' => array(),
-    'required_by' => array(),
-    'disabled' => FALSE,
-    'enabled' => FALSE,
-    'links' => array(),
-  );
-  $form = array(
-    '#tree' => TRUE,
-  );
-  // Set the basic properties.
-  $form['name'] = array(
-    '#markup' => $info['name'],
-  );
-  $form['description'] = array(
-    '#markup' => t($info['description']),
-  );
-  $form['version'] = array(
-    '#markup' => $info['version'],
-  );
-  $form['#requires'] = $extra['requires'];
-  $form['#required_by'] = $extra['required_by'];
-
-  // Check the compatibilities.
-  $compatible = TRUE;
-  $status_short = '';
-  $status_long = '';
-
-  // Check the core compatibility.
-  if (!isset($info['core']) || $info['core'] != DRUPAL_CORE_COMPATIBILITY) {
-    $compatible = FALSE;
-    $status_short .= t('Incompatible with this version of Drupal core.');
-    $status_long .= t('This version is not compatible with Drupal !core_version and should be replaced.', array('!core_version' => DRUPAL_CORE_COMPATIBILITY));
-  }
-
-  // Ensure this module is compatible with the currently installed version of PHP.
-  if (version_compare(phpversion(), $info['php']) < 0) {
-    $compatible = FALSE;
-    $status_short .= t('Incompatible with this version of PHP');
-    $php_required = $info['php'];
-    if (substr_count($info['php'], '.') < 2) {
-      $php_required .= '.*';
-    }
-    $status_long .= t('This module requires PHP version @php_required and is incompatible with PHP version !php_version.', array('@php_required' => $php_required, '!php_version' => phpversion()));
-  }
-
-  // If this module is compatible, present a checkbox indicating
-  // this module may be installed. Otherwise, show a big red X.
-  if ($compatible) {
-    $form['enable'] = array(
-      '#type' => 'checkbox',
-      '#title' => t('Enable'),
-      '#default_value' => $extra['enabled'],
-      '#attributes' => array('role' => 'disabled'),
-    );
-    if ($extra['disabled']) {
-      $form['enable']['#disabled'] = TRUE;
-    }
-  }
-  else {
-    $form['enable'] = array(
-      '#markup' =>  theme('image', array('uri' => 'core/misc/watchdog-error.png', 'alt' => $status_short, 'title' => $status_short)),
-    );
-    $form['description']['#markup'] .= theme('system_modules_incompatible', array('message' => $status_long));
-  }
-
-  // Build operation links.
-  foreach (array('help', 'permissions', 'configure') as $key) {
-    $form['links'][$key] = (isset($extra['links'][$key]) ? $extra['links'][$key] : array());
-  }
-
-  return $form;
-}
-
-/**
  * Display confirmation form for required modules.
  *
  * @param $modules
@@ -1132,142 +856,6 @@ function system_modules_confirm_form($modules, $storage) {
 }
 
 /**
- * Submit callback; handles modules form submission.
- */
-function system_modules_submit($form, &$form_state) {
-  include_once DRUPAL_ROOT . '/core/includes/install.inc';
-
-  // Builds list of modules.
-  $modules = array();
-  // If we're not coming from the confirmation form, build the list of modules.
-  if (empty($form_state['storage'])) {
-    // If we're not coming from the confirmation form, build the module list.
-    foreach ($form_state['values']['modules'] as $group_name => $group) {
-      foreach ($group as $module => $enabled) {
-        $modules[$module] = array('group' => $group_name, 'enabled' => $enabled['enable']);
-      }
-    }
-  }
-  else {
-    // If we are coming from the confirmation form, fetch
-    // the modules out of $form_state.
-    $modules = $form_state['storage']['modules'];
-  }
-
-  // Collect data for all modules to be able to determine dependencies.
-  $files = system_rebuild_module_data();
-
-  // Sorts modules by weight.
-  $sort = array();
-  foreach (array_keys($modules) as $module) {
-    $sort[$module] = $files[$module]->sort;
-  }
-  array_multisort($sort, $modules);
-
-  // Makes sure all required modules are set to be enabled.
-  $more_required = array();
-  $missing_modules = array();
-  foreach ($modules as $name => $module) {
-    if ($module['enabled']) {
-      // Checks that all dependencies are set to be enabled.  Stores the ones
-      // that are not in $dependencies variable so that the user can be alerted
-      // in the confirmation form that more modules need to be enabled.
-      $dependencies = array();
-      foreach (array_keys($files[$name]->requires) as $required) {
-        if (empty($modules[$required]['enabled'])) {
-          if (isset($files[$required])) {
-            $dependencies[] = $files[$required]->info['name'];
-            $modules[$required]['enabled'] = TRUE;
-          }
-          else {
-            $missing_modules[$required]['depends'][] = $name;
-            $modules[$name]['enabled'] = FALSE;
-          }
-        }
-      }
-
-      // Stores additional modules that need to be enabled in $more_required.
-      if (!empty($dependencies)) {
-        $more_required[$name] = array(
-          'name' => $files[$name]->info['name'],
-          'requires' => $dependencies,
-        );
-      }
-    }
-  }
-
-  // Redirects to confirmation form if more modules need to be enabled.
-  if ((!empty($more_required) || !empty($missing_modules)) && !isset($form_state['values']['confirm'])) {
-    $form_state['storage'] = array(
-      'more_required' => $more_required,
-      'modules' => $modules,
-      'missing_modules' => $missing_modules,
-    );
-    $form_state['rebuild'] = TRUE;
-    return;
-  }
-
-  // Invokes hook_requirements('install').  If failures are detected, makes sure
-  // the dependent modules aren't installed either.
-  foreach ($modules as $name => $module) {
-    // Only invoke hook_requirements() on modules that are going to be installed.
-    if ($module['enabled'] && drupal_get_installed_schema_version($name) == SCHEMA_UNINSTALLED) {
-      if (!drupal_check_module($name)) {
-        $modules[$name]['enabled'] = FALSE;
-        foreach (array_keys($files[$name]->required_by) as $required_by) {
-          $modules[$required_by]['enabled'] = FALSE;
-        }
-      }
-    }
-  }
-
-  // Initializes array of actions.
-  $actions = array(
-    'enable' => array(),
-    'disable' => array(),
-    'install' => array(),
-  );
-
-  // Builds arrays of modules that need to be enabled, disabled, and installed.
-  foreach ($modules as $name => $module) {
-    if ($module['enabled']) {
-      if (drupal_get_installed_schema_version($name) == SCHEMA_UNINSTALLED) {
-        $actions['install'][] = $name;
-        $actions['enable'][] = $name;
-      }
-      elseif (!module_exists($name)) {
-        $actions['enable'][] = $name;
-      }
-    }
-    elseif (module_exists($name)) {
-      $actions['disable'][] = $name;
-    }
-  }
-
-  // Gets list of modules prior to install process, unsets $form_state['storage']
-  // so we don't get redirected back to the confirmation form.
-  $pre_install_list = drupal_container()->get('module_handler')->getModuleList();
-  unset($form_state['storage']);
-
-  // Reverse the 'enable' list, to order dependencies before dependents.
-  krsort($actions['enable']);
-
-  // Installs, enables, and disables modules.
-  module_enable($actions['enable'], FALSE);
-  module_disable($actions['disable'], FALSE);
-
-  // Gets module list after install process, flushes caches and displays a
-  // message if there are changes.
-  $post_install_list = drupal_container()->get('module_handler')->getModuleList();
-  if ($pre_install_list != $post_install_list) {
-    drupal_flush_all_caches();
-    drupal_set_message(t('The configuration options have been saved.'));
-  }
-
-  $form_state['redirect'] = 'admin/modules';
-}
-
-/**
  * Uninstall functions
  */
 
diff --git a/core/modules/system/system.module b/core/modules/system/system.module
index c75309c..7f857e2 100644
--- a/core/modules/system/system.module
+++ b/core/modules/system/system.module
@@ -754,23 +754,22 @@ function system_menu() {
   $items['admin/modules'] = array(
     'title' => 'Extend',
     'description' => 'Add and enable modules to extend site functionality.',
-    'page callback' => 'drupal_get_form',
-    'page arguments' => array('system_modules'),
-    'access arguments' => array('administer modules'),
-    'file' => 'system.admin.inc',
+    'route_name' => 'system_modules_list',
     'weight' => -2,
   );
   $items['admin/modules/list'] = array(
     'title' => 'List',
+    'access arguments' => array('administer modules'),
     'type' => MENU_DEFAULT_LOCAL_TASK,
   );
   $items['admin/modules/list/confirm'] = array(
     'title' => 'List',
-    'access arguments' => array('administer modules'),
+    'route_name' => 'system_modules_list_confirm',
     'type' => MENU_VISIBLE_IN_BREADCRUMB,
   );
   $items['admin/modules/uninstall'] = array(
     'title' => 'Uninstall',
+    'page callback' => 'drupal_get_form',
     'page arguments' => array('system_modules_uninstall'),
     'access arguments' => array('administer modules'),
     'type' => MENU_LOCAL_TASK,
diff --git a/core/modules/system/system.routing.yml b/core/modules/system/system.routing.yml
index 69a3eae..021f09a 100644
--- a/core/modules/system/system.routing.yml
+++ b/core/modules/system/system.routing.yml
@@ -4,9 +4,25 @@ system.cron:
     _controller: '\Drupal\system\CronController::run'
   requirements:
     _access_system_cron: 'TRUE'
+
 system.machine_name_transliterate:
   pattern: '/machine_name/transliterate'
   defaults:
     _controller: '\Drupal\system\MachineNameController::transliterate'
   requirements:
     _permission: 'access content'
+
+system_modules_list:
+  pattern: 'admin/modules'
+  defaults:
+    _form: 'Drupal\system\Form\ModulesListForm'
+  requirements:
+    _permission: 'administer modules'
+
+system_modules_list_confirm:
+  pattern: 'admin/modules/list/confirm'
+  defaults:
+    _form: 'Drupal\system\Form\ModulesListForm'
+  requirements:
+    _permission: 'administer modules'
+
