diff options
Diffstat (limited to 'roms/ipxe/src/drivers/linux/linux.c')
| -rw-r--r-- | roms/ipxe/src/drivers/linux/linux.c | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/roms/ipxe/src/drivers/linux/linux.c b/roms/ipxe/src/drivers/linux/linux.c new file mode 100644 index 00000000..83546b27 --- /dev/null +++ b/roms/ipxe/src/drivers/linux/linux.c @@ -0,0 +1,153 @@ +/* + * Copyright (C) 2010 Piotr Jaroszyński <p.jaroszynski@gmail.com> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of the + * License, or any later version. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +FILE_LICENCE(GPL2_OR_LATER); + +/** @file + * + * Linux root_device and root_driver. + */ + +#include <errno.h> +#include <string.h> +#include <stdio.h> +#include <ipxe/linux.h> +#include <ipxe/malloc.h> +#include <ipxe/settings.h> + +LIST_HEAD(linux_device_requests); +LIST_HEAD(linux_global_settings); + +/** Go over the device requests looking for a matching linux driver to handle them. */ +static int linux_probe(struct root_device *rootdev) +{ + struct linux_device_request *request; + struct linux_driver *driver; + struct linux_device *device = NULL; + int rc; + + /* Apply global settings */ + linux_apply_settings(&linux_global_settings, NULL); + + list_for_each_entry(request, &linux_device_requests, list) { + if (! device) + device = zalloc(sizeof(*device)); + + if (! device) + return -ENOMEM; + + rc = 1; + + for_each_table_entry(driver, LINUX_DRIVERS) { + if ((rc = strcmp(driver->name, request->driver)) == 0) + break; + } + + if (rc != 0) { + printf("Linux driver '%s' not found\n", request->driver); + continue; + } + + if (! driver->can_probe) { + printf("Driver '%s' cannot handle any more devices\n", driver->name); + continue; + } + + /* We found a matching driver so add the device to the hierarchy */ + list_add(&device->dev.siblings, &rootdev->dev.children); + device->dev.parent = &rootdev->dev; + INIT_LIST_HEAD(&device->dev.children); + + if (driver->probe(device, request) == 0) { + device->driver = driver; + device->dev.driver_name = driver->name; + /* Driver handled the device so release ownership */ + device = NULL; + } else { + /* Driver failed to handle the device so remove it from the hierarchy + * and reuse the object */ + list_del(&device->dev.siblings); + } + }; + + free(device); + + return 0; +} + +/** Remove all the linux devices registered in probe() */ +static void linux_remove(struct root_device *rootdev) +{ + struct linux_device *device; + struct linux_device *tmp; + + list_for_each_entry_safe(device, tmp, &rootdev->dev.children, dev.siblings) { + list_del(&device->dev.siblings); + device->driver->remove(device); + free(device); + } +} + +/** Linux root driver */ +static struct root_driver linux_root_driver = { + .probe = linux_probe, + .remove = linux_remove, +}; + +/** Linux root device */ +struct root_device linux_root_device __root_device = { + .dev = { .name = "linux" }, + .driver = &linux_root_driver, +}; + +struct linux_setting *linux_find_setting(char *name, struct list_head *settings) +{ + struct linux_setting *setting; + struct linux_setting *result = NULL; + + /* Find the last occurrence of a setting with the specified name */ + list_for_each_entry(setting, settings, list) { + if (strcmp(setting->name, name) == 0) { + result = setting; + } + } + + return result; +} + +void linux_apply_settings(struct list_head *new_settings, struct settings *settings_block) +{ + struct linux_setting *setting; + int rc; + + list_for_each_entry(setting, new_settings, list) { + /* Skip already applied settings */ + if (setting->applied) + continue; + + struct setting *s = find_setting(setting->name); + if (s) { + rc = storef_setting(settings_block, find_setting(setting->name), setting->value); + if (rc != 0) + DBG("linux storing setting '%s' = '%s' failed\n", setting->name, setting->value); + setting->applied = 1; + } else { + DBG("linux unknown setting '%s'\n", setting->name); + } + } +} |