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