Messages in this thread Patch in this message | | | Date | Wed, 22 May 2002 00:33:15 +0200 | From | Jan-Benedict Glaw <> | Subject | [PATCH] Update to srm_env.c driver (for Alpha arch.) |
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Hi Linus!
Please apply this patch. It updates the srm_env.c driver (to access Alpha's SRM environment variables) to its current version (which is already included in up-to-date 2.4.x kernels).
MfG, JBG
--- linux-2.5.17/arch/alpha/kernel/srm_env.c.orig Wed May 22 00:18:23 2002 +++ linux-2.5.17/arch/alpha/kernel/srm_env.c Wed May 22 00:19:12 2002 @@ -1,27 +1,20 @@ /* - * srm_env.c - Access to SRC environment variables through - * the linux procfs + * srm_env.c - Access to SRM environment + * variables through linux' procfs * - * (C)2001, Jan-Benedict Glaw <jbglaw@lug-owl.de> + * Copyright (C) 2001-2002 Jan-Benedict Glaw <jbglaw@lug-owl.de> * * This driver is at all a modified version of Erik Mouw's - * ./linux/Documentation/DocBook/procfs_example.c, so: thanky + * ./linux/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's "Jumpstart" CD. They included - * a patch like this as well. Thanks for idea! - * - * - * This software has been developed while working on the LART - * computing board (http://www.lart.tudelft.nl/). The - * development has been sponsored by the Mobile Multi-media - * Communications (http://www.mmc.tudelft.nl/) and Ubiquitous - * Communications (http://www.ubicom.tudelft.nl/) projects. + * 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 as published by the Free Software - * Foundation version 2. + * 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 @@ -36,6 +29,24 @@ * */ +/* + * Changelog + * ~~~~~~~~~ + * + * Wed, 22 May 2002 00:11:21 +0200 + * - Fix typo on comment (SRC -> SRM) + * - Call this "Version 0.0.4" + * + * Tue, 9 Apr 2002 18:44:40 +0200 + * - Implement access by variable name and additionally + * by number. This is done by creating two subdirectories + * where one holds all names (like the old directory + * did) and the other holding 256 files named like "0", + * "1" and so on. + * - Call this "Version 0.0.3" + * + */ + #include <linux/kernel.h> #include <linux/config.h> #include <linux/module.h> @@ -45,10 +56,11 @@ #include <asm/uaccess.h> #include <asm/machvec.h> -#define DIRNAME "srm_environment" /* Subdir in /proc/ */ -#define VERSION "0.0.2" /* Module version */ -#define NAME "srm_env" /* Module name */ -#define DEBUG +#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 */ +#define VERSION "0.0.4" /* Module version */ +#define NAME "srm_env" /* Module name */ MODULE_AUTHOR("Jan-Benedict Glaw <jbglaw@lug-owl.de>"); MODULE_DESCRIPTION("Accessing Alpha SRM environment through procfs interface"); @@ -61,8 +73,12 @@ struct proc_dir_entry *proc_entry; } srm_env_t; -static struct proc_dir_entry *directory; -static srm_env_t srm_entries[] = { +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 }, @@ -80,10 +96,11 @@ { "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) -{ +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; @@ -108,10 +125,9 @@ return nbytes; } - -static int srm_env_write(struct file *file, const char *buffer, - unsigned long count, void *data) -{ +static int +srm_env_write(struct file *file, const char *buffer, unsigned long count, + void *data) { #define BUFLEN 512 int nbytes; srm_env_t *entry; @@ -127,8 +143,8 @@ MOD_DEC_USE_COUNT; return -ENOMEM; } - - //memcpy(aligned_buffer, buffer, nbytes) + + /* memcpy(aligned_buffer, buffer, nbytes) */ if(copy_from_user(buf, buffer, count)) { MOD_DEC_USE_COUNT; @@ -150,55 +166,142 @@ return nbytes; } -static void srm_env_cleanup(void) -{ +static void +srm_env_cleanup(void) { srm_env_t *entry; + unsigned long var_num; - if(directory) { - entry = srm_entries; - while(entry->name != NULL && entry->id != 0) { - if(entry->proc_entry) { - remove_proc_entry(entry->name, directory); - entry->proc_entry = NULL; + if(base_dir) { + /* + * Remove named entries + */ + if(named_dir) { + entry = srm_named_entries; + while(entry->name != NULL && entry->id != 0) { + if(entry->proc_entry) { + remove_proc_entry(entry->name, + named_dir); + entry->proc_entry = NULL; + } + entry++; } - entry++; + remove_proc_entry(NAMED_DIR, base_dir); } - remove_proc_entry(DIRNAME, NULL); + + /* + * Remove numbered entries + */ + if(numbered_dir) { + for(var_num = 0; var_num <= 255; var_num++) { + entry = &srm_numbered_entries[var_num]; + + if(entry->proc_entry) { + 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) -{ +static int __init +srm_env_init(void) { srm_env_t *entry; - + unsigned long var_num; + + /* + * Check system + */ if(!alpha_using_srm) { printk(KERN_INFO "%s: This Alpha system doesn't " "know about SRM...\n", __FUNCTION__); return -ENODEV; } - directory = proc_mkdir(DIRNAME, NULL); - if(directory == NULL) - return -ENOMEM; - - directory->owner = THIS_MODULE; - - /* Now create all the nodes... */ - entry = srm_entries; + /* + * Init numbers + */ + for(var_num = 0; var_num <= 255; var_num++) + sprintf(number[var_num], "%ld", var_num); + + /* + * Create base directory + */ + base_dir = proc_mkdir(BASE_DIR, NULL); + if(base_dir == NULL) { + 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); + if(named_dir == NULL) { + 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); + if(numbered_dir == NULL) { + 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; while(entry->name != NULL && entry->id != 0) { - entry->proc_entry = create_proc_entry(entry->name, 0644, - directory); + entry->proc_entry = create_proc_entry(entry->name, + 0644, named_dir); if(entry->proc_entry == NULL) goto cleanup; - entry->proc_entry->data = entry; + + 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->proc_entry->owner = THIS_MODULE; + entry++; } - + + /* + * Create all numbered nodes + */ + for(var_num = 0; var_num <= 255; var_num++) { + entry = &srm_numbered_entries[var_num]; + entry->name = number[var_num]; + + entry->proc_entry = create_proc_entry(entry->name, + 0644, numbered_dir); + if(entry->proc_entry == NULL) + 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; @@ -208,9 +311,8 @@ return -ENOMEM; } - -static void __exit srm_env_exit(void) -{ +static void __exit +srm_env_exit(void) { srm_env_cleanup(); printk(KERN_INFO "%s: unloaded successfully\n", NAME); return;
-- Jan-Benedict Glaw . jbglaw@lug-owl.de . +49-172-7608481 -- New APT-Proxy written in shell script -- http://lug-owl.de/~jbglaw/software/ap2/ [unhandled content-type:application/pgp-signature] | |