301 строка
6.8 KiB
C
301 строка
6.8 KiB
C
/*
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* srm_env.c - Access to SRM environment
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* variables through linux' procfs
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*
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* (C) 2001,2002,2006 by Jan-Benedict Glaw <jbglaw@lug-owl.de>
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*
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* This driver is a modified version of Erik Mouw's example proc
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* interface, so: thank you, Erik! He can be reached via email at
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* <J.A.K.Mouw@its.tudelft.nl>. It is based on an idea
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* provided by DEC^WCompaq^WIntel's "Jumpstart" CD. They
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* included a patch like this as well. Thanks for idea!
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*
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* This program is free software; you can redistribute
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* it and/or modify it under the terms of the GNU General
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* Public License version 2 as published by the Free Software
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* Foundation.
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*
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* This program is distributed in the hope that it will be
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* useful, but WITHOUT ANY WARRANTY; without even the implied
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* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place,
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* Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <linux/kernel.h>
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#include <linux/gfp.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <asm/console.h>
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#include <asm/uaccess.h>
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#include <asm/machvec.h>
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#define BASE_DIR "srm_environment" /* Subdir in /proc/ */
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#define NAMED_DIR "named_variables" /* Subdir for known variables */
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#define NUMBERED_DIR "numbered_variables" /* Subdir for all variables */
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#define VERSION "0.0.6" /* Module version */
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#define NAME "srm_env" /* Module name */
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MODULE_AUTHOR("Jan-Benedict Glaw <jbglaw@lug-owl.de>");
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MODULE_DESCRIPTION("Accessing Alpha SRM environment through procfs interface");
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MODULE_LICENSE("GPL");
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typedef struct _srm_env {
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char *name;
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unsigned long id;
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struct proc_dir_entry *proc_entry;
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} srm_env_t;
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static struct proc_dir_entry *base_dir;
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static struct proc_dir_entry *named_dir;
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static struct proc_dir_entry *numbered_dir;
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static char number[256][4];
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static srm_env_t srm_named_entries[] = {
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{ "auto_action", ENV_AUTO_ACTION },
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{ "boot_dev", ENV_BOOT_DEV },
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{ "bootdef_dev", ENV_BOOTDEF_DEV },
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{ "booted_dev", ENV_BOOTED_DEV },
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{ "boot_file", ENV_BOOT_FILE },
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{ "booted_file", ENV_BOOTED_FILE },
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{ "boot_osflags", ENV_BOOT_OSFLAGS },
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{ "booted_osflags", ENV_BOOTED_OSFLAGS },
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{ "boot_reset", ENV_BOOT_RESET },
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{ "dump_dev", ENV_DUMP_DEV },
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{ "enable_audit", ENV_ENABLE_AUDIT },
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{ "license", ENV_LICENSE },
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{ "char_set", ENV_CHAR_SET },
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{ "language", ENV_LANGUAGE },
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{ "tty_dev", ENV_TTY_DEV },
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{ NULL, 0 },
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};
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static srm_env_t srm_numbered_entries[256];
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static int srm_env_proc_show(struct seq_file *m, void *v)
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{
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unsigned long ret;
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srm_env_t *entry;
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char *page;
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entry = m->private;
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page = (char *)__get_free_page(GFP_USER);
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if (!page)
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return -ENOMEM;
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ret = callback_getenv(entry->id, page, PAGE_SIZE);
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if ((ret >> 61) == 0) {
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seq_write(m, page, ret);
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ret = 0;
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} else
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ret = -EFAULT;
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free_page((unsigned long)page);
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return ret;
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}
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static int srm_env_proc_open(struct inode *inode, struct file *file)
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{
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return single_open(file, srm_env_proc_show, PDE(inode)->data);
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}
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static ssize_t srm_env_proc_write(struct file *file, const char __user *buffer,
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size_t count, loff_t *pos)
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{
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int res;
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srm_env_t *entry = PDE(file->f_path.dentry->d_inode)->data;
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char *buf = (char *) __get_free_page(GFP_USER);
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unsigned long ret1, ret2;
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if (!buf)
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return -ENOMEM;
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res = -EINVAL;
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if (count >= PAGE_SIZE)
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goto out;
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res = -EFAULT;
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if (copy_from_user(buf, buffer, count))
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goto out;
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buf[count] = '\0';
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ret1 = callback_setenv(entry->id, buf, count);
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if ((ret1 >> 61) == 0) {
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do
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ret2 = callback_save_env();
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while((ret2 >> 61) == 1);
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res = (int) ret1;
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}
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out:
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free_page((unsigned long)buf);
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return res;
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}
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static const struct file_operations srm_env_proc_fops = {
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.owner = THIS_MODULE,
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.open = srm_env_proc_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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.write = srm_env_proc_write,
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};
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static void
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srm_env_cleanup(void)
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{
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srm_env_t *entry;
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unsigned long var_num;
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if (base_dir) {
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/*
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* Remove named entries
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*/
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if (named_dir) {
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entry = srm_named_entries;
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while (entry->name != NULL && entry->id != 0) {
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if (entry->proc_entry) {
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remove_proc_entry(entry->name,
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named_dir);
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entry->proc_entry = NULL;
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}
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entry++;
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}
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remove_proc_entry(NAMED_DIR, base_dir);
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}
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/*
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* Remove numbered entries
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*/
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if (numbered_dir) {
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for (var_num = 0; var_num <= 255; var_num++) {
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entry = &srm_numbered_entries[var_num];
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if (entry->proc_entry) {
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remove_proc_entry(entry->name,
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numbered_dir);
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entry->proc_entry = NULL;
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entry->name = NULL;
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}
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}
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remove_proc_entry(NUMBERED_DIR, base_dir);
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}
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remove_proc_entry(BASE_DIR, NULL);
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}
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return;
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}
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static int __init
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srm_env_init(void)
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{
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srm_env_t *entry;
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unsigned long var_num;
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/*
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* Check system
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*/
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if (!alpha_using_srm) {
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printk(KERN_INFO "%s: This Alpha system doesn't "
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"know about SRM (or you've booted "
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"SRM->MILO->Linux, which gets "
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"misdetected)...\n", __func__);
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return -ENODEV;
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}
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/*
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* Init numbers
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*/
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for (var_num = 0; var_num <= 255; var_num++)
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sprintf(number[var_num], "%ld", var_num);
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/*
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* Create base directory
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*/
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base_dir = proc_mkdir(BASE_DIR, NULL);
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if (!base_dir) {
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printk(KERN_ERR "Couldn't create base dir /proc/%s\n",
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BASE_DIR);
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goto cleanup;
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}
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/*
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* Create per-name subdirectory
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*/
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named_dir = proc_mkdir(NAMED_DIR, base_dir);
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if (!named_dir) {
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printk(KERN_ERR "Couldn't create dir /proc/%s/%s\n",
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BASE_DIR, NAMED_DIR);
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goto cleanup;
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}
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/*
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* Create per-number subdirectory
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*/
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numbered_dir = proc_mkdir(NUMBERED_DIR, base_dir);
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if (!numbered_dir) {
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printk(KERN_ERR "Couldn't create dir /proc/%s/%s\n",
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BASE_DIR, NUMBERED_DIR);
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goto cleanup;
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}
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/*
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* Create all named nodes
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*/
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entry = srm_named_entries;
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while (entry->name && entry->id) {
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entry->proc_entry = proc_create_data(entry->name, 0644, named_dir,
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&srm_env_proc_fops, entry);
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if (!entry->proc_entry)
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goto cleanup;
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entry++;
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}
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/*
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* Create all numbered nodes
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*/
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for (var_num = 0; var_num <= 255; var_num++) {
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entry = &srm_numbered_entries[var_num];
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entry->name = number[var_num];
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entry->proc_entry = proc_create_data(entry->name, 0644, numbered_dir,
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&srm_env_proc_fops, entry);
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if (!entry->proc_entry)
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goto cleanup;
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entry->id = var_num;
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}
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printk(KERN_INFO "%s: version %s loaded successfully\n", NAME,
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VERSION);
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return 0;
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cleanup:
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srm_env_cleanup();
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return -ENOMEM;
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}
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static void __exit
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srm_env_exit(void)
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{
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srm_env_cleanup();
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printk(KERN_INFO "%s: unloaded successfully\n", NAME);
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return;
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}
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module_init(srm_env_init);
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module_exit(srm_env_exit);
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