2005-04-16 15:20:36 -07:00
|
|
|
/*
|
|
|
|
* srm_env.c - Access to SRM environment
|
|
|
|
* variables through linux' procfs
|
|
|
|
*
|
2006-11-07 15:50:37 -07:00
|
|
|
* (C) 2001,2002,2006 by Jan-Benedict Glaw <jbglaw@lug-owl.de>
|
2005-04-16 15:20:36 -07:00
|
|
|
*
|
|
|
|
* This driver is at all a modified version of Erik Mouw's
|
|
|
|
* Documentation/DocBook/procfs_example.c, so: thank
|
|
|
|
* you, Erik! He can be reached via email at
|
|
|
|
* <J.A.K.Mouw@its.tudelft.nl>. It is based on an idea
|
|
|
|
* provided by DEC^WCompaq^WIntel's "Jumpstart" CD. They
|
|
|
|
* included a patch like this as well. Thanks for idea!
|
|
|
|
*
|
|
|
|
* This program is free software; you can redistribute
|
|
|
|
* it and/or modify it under the terms of the GNU General
|
|
|
|
* Public License version 2 as published by the Free Software
|
|
|
|
* Foundation.
|
|
|
|
*
|
|
|
|
* 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.
|
2006-11-07 15:50:37 -07:00
|
|
|
*
|
2005-04-16 15:20:36 -07:00
|
|
|
* 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., 59 Temple Place,
|
|
|
|
* Suite 330, Boston, MA 02111-1307 USA
|
|
|
|
*
|
|
|
|
*/
|
|
|
|
|
|
|
|
#include <linux/kernel.h>
|
|
|
|
#include <linux/module.h>
|
|
|
|
#include <linux/init.h>
|
|
|
|
#include <linux/proc_fs.h>
|
|
|
|
#include <asm/console.h>
|
|
|
|
#include <asm/uaccess.h>
|
|
|
|
#include <asm/machvec.h>
|
|
|
|
|
|
|
|
#define BASE_DIR "srm_environment" /* Subdir in /proc/ */
|
|
|
|
#define NAMED_DIR "named_variables" /* Subdir for known variables */
|
|
|
|
#define NUMBERED_DIR "numbered_variables" /* Subdir for all variables */
|
2006-11-07 15:50:37 -07:00
|
|
|
#define VERSION "0.0.6" /* Module version */
|
2005-04-16 15:20:36 -07:00
|
|
|
#define NAME "srm_env" /* Module name */
|
|
|
|
|
|
|
|
MODULE_AUTHOR("Jan-Benedict Glaw <jbglaw@lug-owl.de>");
|
|
|
|
MODULE_DESCRIPTION("Accessing Alpha SRM environment through procfs interface");
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
|
|
|
|
typedef struct _srm_env {
|
|
|
|
char *name;
|
|
|
|
unsigned long id;
|
|
|
|
struct proc_dir_entry *proc_entry;
|
|
|
|
} srm_env_t;
|
|
|
|
|
|
|
|
static struct proc_dir_entry *base_dir;
|
|
|
|
static struct proc_dir_entry *named_dir;
|
|
|
|
static struct proc_dir_entry *numbered_dir;
|
|
|
|
static char number[256][4];
|
|
|
|
|
|
|
|
static srm_env_t srm_named_entries[] = {
|
|
|
|
{ "auto_action", ENV_AUTO_ACTION },
|
|
|
|
{ "boot_dev", ENV_BOOT_DEV },
|
|
|
|
{ "bootdef_dev", ENV_BOOTDEF_DEV },
|
|
|
|
{ "booted_dev", ENV_BOOTED_DEV },
|
|
|
|
{ "boot_file", ENV_BOOT_FILE },
|
|
|
|
{ "booted_file", ENV_BOOTED_FILE },
|
|
|
|
{ "boot_osflags", ENV_BOOT_OSFLAGS },
|
|
|
|
{ "booted_osflags", ENV_BOOTED_OSFLAGS },
|
|
|
|
{ "boot_reset", ENV_BOOT_RESET },
|
|
|
|
{ "dump_dev", ENV_DUMP_DEV },
|
|
|
|
{ "enable_audit", ENV_ENABLE_AUDIT },
|
|
|
|
{ "license", ENV_LICENSE },
|
|
|
|
{ "char_set", ENV_CHAR_SET },
|
|
|
|
{ "language", ENV_LANGUAGE },
|
|
|
|
{ "tty_dev", ENV_TTY_DEV },
|
|
|
|
{ NULL, 0 },
|
|
|
|
};
|
|
|
|
static srm_env_t srm_numbered_entries[256];
|
|
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
srm_env_read(char *page, char **start, off_t off, int count, int *eof,
|
|
|
|
void *data)
|
|
|
|
{
|
|
|
|
int nbytes;
|
|
|
|
unsigned long ret;
|
|
|
|
srm_env_t *entry;
|
|
|
|
|
2006-11-07 15:50:37 -07:00
|
|
|
if (off != 0) {
|
|
|
|
*eof = 1;
|
|
|
|
return 0;
|
|
|
|
}
|
2005-04-16 15:20:36 -07:00
|
|
|
|
|
|
|
entry = (srm_env_t *) data;
|
|
|
|
ret = callback_getenv(entry->id, page, count);
|
|
|
|
|
2006-11-07 15:50:37 -07:00
|
|
|
if ((ret >> 61) == 0) {
|
2005-04-16 15:20:36 -07:00
|
|
|
nbytes = (int) ret;
|
2006-11-07 15:50:37 -07:00
|
|
|
*eof = 1;
|
|
|
|
} else
|
2005-04-16 15:20:36 -07:00
|
|
|
nbytes = -EFAULT;
|
|
|
|
|
|
|
|
return nbytes;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
srm_env_write(struct file *file, const char __user *buffer, unsigned long count,
|
|
|
|
void *data)
|
|
|
|
{
|
|
|
|
int res;
|
|
|
|
srm_env_t *entry;
|
|
|
|
char *buf = (char *) __get_free_page(GFP_USER);
|
|
|
|
unsigned long ret1, ret2;
|
|
|
|
|
|
|
|
entry = (srm_env_t *) data;
|
|
|
|
|
|
|
|
if (!buf)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
res = -EINVAL;
|
|
|
|
if (count >= PAGE_SIZE)
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
res = -EFAULT;
|
|
|
|
if (copy_from_user(buf, buffer, count))
|
|
|
|
goto out;
|
|
|
|
buf[count] = '\0';
|
|
|
|
|
|
|
|
ret1 = callback_setenv(entry->id, buf, count);
|
|
|
|
if ((ret1 >> 61) == 0) {
|
2006-11-07 15:50:37 -07:00
|
|
|
do
|
2005-04-16 15:20:36 -07:00
|
|
|
ret2 = callback_save_env();
|
|
|
|
while((ret2 >> 61) == 1);
|
|
|
|
res = (int) ret1;
|
|
|
|
}
|
|
|
|
|
|
|
|
out:
|
|
|
|
free_page((unsigned long)buf);
|
|
|
|
return res;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
srm_env_cleanup(void)
|
|
|
|
{
|
|
|
|
srm_env_t *entry;
|
|
|
|
unsigned long var_num;
|
|
|
|
|
2006-11-07 15:50:37 -07:00
|
|
|
if (base_dir) {
|
2005-04-16 15:20:36 -07:00
|
|
|
/*
|
|
|
|
* Remove named entries
|
|
|
|
*/
|
2006-11-07 15:50:37 -07:00
|
|
|
if (named_dir) {
|
2005-04-16 15:20:36 -07:00
|
|
|
entry = srm_named_entries;
|
2006-11-07 15:50:37 -07:00
|
|
|
while (entry->name != NULL && entry->id != 0) {
|
|
|
|
if (entry->proc_entry) {
|
2005-04-16 15:20:36 -07:00
|
|
|
remove_proc_entry(entry->name,
|
|
|
|
named_dir);
|
|
|
|
entry->proc_entry = NULL;
|
|
|
|
}
|
|
|
|
entry++;
|
|
|
|
}
|
|
|
|
remove_proc_entry(NAMED_DIR, base_dir);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Remove numbered entries
|
|
|
|
*/
|
2006-11-07 15:50:37 -07:00
|
|
|
if (numbered_dir) {
|
|
|
|
for (var_num = 0; var_num <= 255; var_num++) {
|
2005-04-16 15:20:36 -07:00
|
|
|
entry = &srm_numbered_entries[var_num];
|
|
|
|
|
2006-11-07 15:50:37 -07:00
|
|
|
if (entry->proc_entry) {
|
2005-04-16 15:20:36 -07:00
|
|
|
remove_proc_entry(entry->name,
|
|
|
|
numbered_dir);
|
|
|
|
entry->proc_entry = NULL;
|
|
|
|
entry->name = NULL;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
remove_proc_entry(NUMBERED_DIR, base_dir);
|
|
|
|
}
|
|
|
|
|
|
|
|
remove_proc_entry(BASE_DIR, NULL);
|
|
|
|
}
|
|
|
|
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int __init
|
|
|
|
srm_env_init(void)
|
|
|
|
{
|
|
|
|
srm_env_t *entry;
|
|
|
|
unsigned long var_num;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Check system
|
|
|
|
*/
|
2006-11-07 15:50:37 -07:00
|
|
|
if (!alpha_using_srm) {
|
2005-04-16 15:20:36 -07:00
|
|
|
printk(KERN_INFO "%s: This Alpha system doesn't "
|
|
|
|
"know about SRM (or you've booted "
|
|
|
|
"SRM->MILO->Linux, which gets "
|
2008-04-28 02:13:46 -07:00
|
|
|
"misdetected)...\n", __func__);
|
2005-04-16 15:20:36 -07:00
|
|
|
return -ENODEV;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Init numbers
|
|
|
|
*/
|
2006-11-07 15:50:37 -07:00
|
|
|
for (var_num = 0; var_num <= 255; var_num++)
|
2005-04-16 15:20:36 -07:00
|
|
|
sprintf(number[var_num], "%ld", var_num);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Create base directory
|
|
|
|
*/
|
|
|
|
base_dir = proc_mkdir(BASE_DIR, NULL);
|
2006-11-07 15:50:37 -07:00
|
|
|
if (!base_dir) {
|
2005-04-16 15:20:36 -07:00
|
|
|
printk(KERN_ERR "Couldn't create base dir /proc/%s\n",
|
|
|
|
BASE_DIR);
|
|
|
|
goto cleanup;
|
|
|
|
}
|
|
|
|
base_dir->owner = THIS_MODULE;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Create per-name subdirectory
|
|
|
|
*/
|
|
|
|
named_dir = proc_mkdir(NAMED_DIR, base_dir);
|
2006-11-07 15:50:37 -07:00
|
|
|
if (!named_dir) {
|
2005-04-16 15:20:36 -07:00
|
|
|
printk(KERN_ERR "Couldn't create dir /proc/%s/%s\n",
|
|
|
|
BASE_DIR, NAMED_DIR);
|
|
|
|
goto cleanup;
|
|
|
|
}
|
|
|
|
named_dir->owner = THIS_MODULE;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Create per-number subdirectory
|
|
|
|
*/
|
|
|
|
numbered_dir = proc_mkdir(NUMBERED_DIR, base_dir);
|
2006-11-07 15:50:37 -07:00
|
|
|
if (!numbered_dir) {
|
2005-04-16 15:20:36 -07:00
|
|
|
printk(KERN_ERR "Couldn't create dir /proc/%s/%s\n",
|
|
|
|
BASE_DIR, NUMBERED_DIR);
|
|
|
|
goto cleanup;
|
|
|
|
|
|
|
|
}
|
|
|
|
numbered_dir->owner = THIS_MODULE;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Create all named nodes
|
|
|
|
*/
|
|
|
|
entry = srm_named_entries;
|
2006-11-07 15:50:37 -07:00
|
|
|
while (entry->name && entry->id) {
|
2005-04-16 15:20:36 -07:00
|
|
|
entry->proc_entry = create_proc_entry(entry->name,
|
|
|
|
0644, named_dir);
|
2006-11-07 15:50:37 -07:00
|
|
|
if (!entry->proc_entry)
|
2005-04-16 15:20:36 -07:00
|
|
|
goto cleanup;
|
|
|
|
|
|
|
|
entry->proc_entry->data = (void *) entry;
|
|
|
|
entry->proc_entry->owner = THIS_MODULE;
|
|
|
|
entry->proc_entry->read_proc = srm_env_read;
|
|
|
|
entry->proc_entry->write_proc = srm_env_write;
|
|
|
|
|
|
|
|
entry++;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Create all numbered nodes
|
|
|
|
*/
|
2006-11-07 15:50:37 -07:00
|
|
|
for (var_num = 0; var_num <= 255; var_num++) {
|
2005-04-16 15:20:36 -07:00
|
|
|
entry = &srm_numbered_entries[var_num];
|
|
|
|
entry->name = number[var_num];
|
|
|
|
|
|
|
|
entry->proc_entry = create_proc_entry(entry->name,
|
|
|
|
0644, numbered_dir);
|
2006-11-07 15:50:37 -07:00
|
|
|
if (!entry->proc_entry)
|
2005-04-16 15:20:36 -07:00
|
|
|
goto cleanup;
|
|
|
|
|
|
|
|
entry->id = var_num;
|
|
|
|
entry->proc_entry->data = (void *) entry;
|
|
|
|
entry->proc_entry->owner = THIS_MODULE;
|
|
|
|
entry->proc_entry->read_proc = srm_env_read;
|
|
|
|
entry->proc_entry->write_proc = srm_env_write;
|
|
|
|
}
|
|
|
|
|
|
|
|
printk(KERN_INFO "%s: version %s loaded successfully\n", NAME,
|
|
|
|
VERSION);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
cleanup:
|
|
|
|
srm_env_cleanup();
|
|
|
|
|
|
|
|
return -ENOMEM;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __exit
|
|
|
|
srm_env_exit(void)
|
|
|
|
{
|
|
|
|
srm_env_cleanup();
|
|
|
|
printk(KERN_INFO "%s: unloaded successfully\n", NAME);
|
|
|
|
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
module_init(srm_env_init);
|
|
|
|
module_exit(srm_env_exit);
|