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336 lines
7.7 KiB
336 lines
7.7 KiB
20 years ago
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/*
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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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* Copyright (C) 2001-2002 Jan-Benedict Glaw <jbglaw@lug-owl.de>
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*
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* This driver is at all a modified version of Erik Mouw's
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* Documentation/DocBook/procfs_example.c, so: thank
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* 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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/*
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* Changelog
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* ~~~~~~~~~
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*
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* Thu, 22 Aug 2002 15:10:43 +0200
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* - Update Config.help entry. I got a number of emails asking
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* me to tell their senders if they could make use of this
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* piece of code... So: "SRM is something like BIOS for your
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* Alpha"
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* - Update code formatting a bit to better conform CodingStyle
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* rules.
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* - So this is v0.0.5, with no changes (except formatting)
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*
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* Wed, 22 May 2002 00:11:21 +0200
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* - Fix typo on comment (SRC -> SRM)
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* - Call this "Version 0.0.4"
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*
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* Tue, 9 Apr 2002 18:44:40 +0200
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* - Implement access by variable name and additionally
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* by number. This is done by creating two subdirectories
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* where one holds all names (like the old directory
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* did) and the other holding 256 files named like "0",
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* "1" and so on.
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* - Call this "Version 0.0.3"
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*
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*/
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#include <linux/kernel.h>
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#include <linux/config.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 <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 "0.0.5" /* 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
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srm_env_read(char *page, char **start, off_t off, int count, int *eof,
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void *data)
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{
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int nbytes;
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unsigned long ret;
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srm_env_t *entry;
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if(off != 0)
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return -EFAULT;
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entry = (srm_env_t *) data;
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ret = callback_getenv(entry->id, page, count);
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if((ret >> 61) == 0)
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nbytes = (int) ret;
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else
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nbytes = -EFAULT;
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return nbytes;
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}
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static int
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srm_env_write(struct file *file, const char __user *buffer, unsigned long count,
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void *data)
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{
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int res;
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srm_env_t *entry;
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char *buf = (char *) __get_free_page(GFP_USER);
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unsigned long ret1, ret2;
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entry = (srm_env_t *) data;
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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 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", __FUNCTION__);
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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 == NULL) {
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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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base_dir->owner = THIS_MODULE;
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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 == NULL) {
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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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named_dir->owner = THIS_MODULE;
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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 == NULL) {
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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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numbered_dir->owner = THIS_MODULE;
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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 != NULL && entry->id != 0) {
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entry->proc_entry = create_proc_entry(entry->name,
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0644, named_dir);
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if(entry->proc_entry == NULL)
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goto cleanup;
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entry->proc_entry->data = (void *) entry;
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entry->proc_entry->owner = THIS_MODULE;
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entry->proc_entry->read_proc = srm_env_read;
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entry->proc_entry->write_proc = srm_env_write;
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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 = create_proc_entry(entry->name,
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0644, numbered_dir);
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if(entry->proc_entry == NULL)
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goto cleanup;
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entry->id = var_num;
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entry->proc_entry->data = (void *) entry;
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entry->proc_entry->owner = THIS_MODULE;
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entry->proc_entry->read_proc = srm_env_read;
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entry->proc_entry->write_proc = srm_env_write;
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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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