-/*
- * load a new default for a specified environment into the default share
- * regions list. If a previous default exists for the envrionment specification
- * it is returned along with its reference. It is expected that the new
- * sytem region structure passes a reference.
- */
-
-shared_region_mapping_t
-update_default_shared_region(
- shared_region_mapping_t new_system_region)
-{
- shared_region_mapping_t old_system_region;
- unsigned int fs_base;
- unsigned int system;
-
- fs_base = new_system_region->fs_base;
- system = new_system_region->system;
- new_system_region->flags |= SHARED_REGION_SYSTEM;
- default_regions_list_lock();
- old_system_region = default_environment_shared_regions;
-
- if((old_system_region != NULL) &&
- (old_system_region->fs_base == fs_base) &&
- (old_system_region->system == system)) {
- new_system_region->default_env_list =
- old_system_region->default_env_list;
- default_environment_shared_regions = new_system_region;
- default_regions_list_unlock();
- old_system_region->flags |= SHARED_REGION_STALE;
- return old_system_region;
- }
- if (old_system_region) {
- while(old_system_region->default_env_list != NULL) {
- if((old_system_region->default_env_list->fs_base == fs_base) &&
- (old_system_region->default_env_list->system == system)) {
- new_system_region->default_env_list =
- old_system_region->default_env_list
- ->default_env_list;
- old_system_region->default_env_list =
- new_system_region;
- default_regions_list_unlock();
- old_system_region->flags |= SHARED_REGION_STALE;
- return old_system_region;
- }
- old_system_region = old_system_region->default_env_list;
- }
- }
- /* If we get here, we are at the end of the system list and we */
- /* did not find a pre-existing entry */
- if(old_system_region) {
- old_system_region->default_env_list = new_system_region;
- } else {
- default_environment_shared_regions = new_system_region;
- }
- default_regions_list_unlock();
- return NULL;
-}
-
-/*
- * lookup a system_shared_region for the environment specified. If one is
- * found, it is returned along with a reference against the structure
- */
-
-shared_region_mapping_t
-lookup_default_shared_region(
- unsigned int fs_base,
- unsigned int system)
-{
- shared_region_mapping_t system_region;
- default_regions_list_lock();
- system_region = default_environment_shared_regions;
-
- while(system_region != NULL) {
- if((system_region->fs_base == fs_base) &&
- (system_region->system == system)) {
- break;
- }
- system_region = system_region->default_env_list;
- }
- if(system_region)
- shared_region_mapping_ref(system_region);
- default_regions_list_unlock();
- return system_region;
-}
-
-/*
- * remove a system_region default if it appears in the default regions list.
- * Drop a reference on removal.
- */
-
-void
-remove_default_shared_region(
- shared_region_mapping_t system_region)
-{
- shared_region_mapping_t old_system_region;
- unsigned int fs_base;
- unsigned int system;
-
- default_regions_list_lock();
- old_system_region = default_environment_shared_regions;
-
- if(old_system_region == NULL) {
- default_regions_list_unlock();
- return;
- }
-
- if (old_system_region == system_region) {
- default_environment_shared_regions
- = old_system_region->default_env_list;
- old_system_region->flags |= SHARED_REGION_STALE;
- shared_region_mapping_dealloc(old_system_region);
- default_regions_list_unlock();
- return;
- }
-
- while(old_system_region->default_env_list != NULL) {
- if(old_system_region->default_env_list == system_region) {
- shared_region_mapping_t dead_region;
- dead_region = old_system_region->default_env_list;
- old_system_region->default_env_list =
- old_system_region->default_env_list->default_env_list;
- dead_region->flags |= SHARED_REGION_STALE;
- shared_region_mapping_dealloc(dead_region);
- default_regions_list_unlock();
- return;
- }
- old_system_region = old_system_region->default_env_list;
- }
- default_regions_list_unlock();
-}
-
-void
-remove_all_shared_regions()
-{
- shared_region_mapping_t system_region;
- shared_region_mapping_t next_system_region;
-
- default_regions_list_lock();
- system_region = default_environment_shared_regions;
-
- if(system_region == NULL) {
- default_regions_list_unlock();
- return;
- }
-
- while(system_region != NULL) {
- next_system_region = system_region->default_env_list;
- system_region->flags |= SHARED_REGION_STALE;
- shared_region_mapping_dealloc(system_region);
- system_region = next_system_region;
- }
- default_environment_shared_regions = NULL;
- default_regions_list_unlock();
-}
-
-/* shared_com_boot_time_init initializes the common page shared data and */
-/* text region. This region is semi independent of the split libs */
-/* and so its policies have to be handled differently by the code that */
-/* manipulates the mapping of shared region environments. However, */
-/* the shared region delivery system supports both */
-shared_com_boot_time_init()
-{
- kern_return_t kret;
- vm_named_entry_t named_entry;
-
- if(com_region_handle) {
- panic("shared_com_boot_time_init: "
- "com_region_handle already set\n");
- }
-
- /* create com page region */
- if(kret = vm_region_object_create(kernel_map,
- com_region_size,
- &com_region_handle)) {
- panic("shared_com_boot_time_init: "
- "unable to create comm page\n");
- return;
- }
- /* now set export the underlying region/map */
- named_entry = (vm_named_entry_t)com_region_handle->ip_kobject;
- com_region_map = named_entry->backing.map;
- /* wrap the com region in its own shared file mapping structure */
- shared_region_mapping_create(com_region_handle,
- com_region_size, NULL, 0, 0,
- GLOBAL_COM_REGION_BASE, &com_mapping_resource,
- 0, 0);
-
-}
-
projects / apple / xnu.git / blobdiff