Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 218 insertions, 0 deletions

diff --git a/arch/alpha/kernel/srm_env.c b/arch/alpha/kernel/srm_env.c
new file mode 100644
index 000000000..528d2be58
--- /dev/null
+++ b/arch/alpha/kernel/srm_env.c
@@ -0,0 +1,218 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * srm_env.c - Access to SRM environment
+ *             variables through linux' procfs
+ *
+ * (C) 2001,2002,2006 by Jan-Benedict Glaw <jbglaw@lug-owl.de>
+ *
+ * This driver is a modified version of Erik Mouw's example proc
+ * interface, 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!
+ */
+
+#include <linux/kernel.h>
+#include <linux/gfp.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <asm/console.h>
+#include <linux/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	*/
+#define VERSION		"0.0.6"			/* 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");
+MODULE_LICENSE("GPL");
+
+typedef struct _srm_env {
+	char			*name;
+	unsigned long		id;
+} 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 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 int srm_env_proc_show(struct seq_file *m, void *v)
+{
+	unsigned long	ret;
+	unsigned long	id = (unsigned long)m->private;
+	char		*page;
+
+	page = (char *)__get_free_page(GFP_USER);
+	if (!page)
+		return -ENOMEM;
+
+	ret = callback_getenv(id, page, PAGE_SIZE);
+
+	if ((ret >> 61) == 0) {
+		seq_write(m, page, ret);
+		ret = 0;
+	} else
+		ret = -EFAULT;
+	free_page((unsigned long)page);
+	return ret;
+}
+
+static int srm_env_proc_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, srm_env_proc_show, PDE_DATA(inode));
+}
+
+static ssize_t srm_env_proc_write(struct file *file, const char __user *buffer,
+				  size_t count, loff_t *pos)
+{
+	int res;
+	unsigned long	id = (unsigned long)PDE_DATA(file_inode(file));
+	char		*buf = (char *) __get_free_page(GFP_USER);
+	unsigned long	ret1, ret2;
+
+	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(id, buf, count);
+	if ((ret1 >> 61) == 0) {
+		do
+			ret2 = callback_save_env();
+		while((ret2 >> 61) == 1);
+		res = (int) ret1;
+	}
+
+ out:
+	free_page((unsigned long)buf);
+	return res;
+}
+
+static const struct proc_ops srm_env_proc_ops = {
+	.proc_open	= srm_env_proc_open,
+	.proc_read	= seq_read,
+	.proc_lseek	= seq_lseek,
+	.proc_release	= single_release,
+	.proc_write	= srm_env_proc_write,
+};
+
+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 (or you've booted "
+				"SRM->MILO->Linux, which gets "
+				"misdetected)...\n", __func__);
+		return -ENODEV;
+	}
+
+	/*
+	 * Create base directory
+	 */
+	base_dir = proc_mkdir(BASE_DIR, NULL);
+	if (!base_dir) {
+		printk(KERN_ERR "Couldn't create base dir /proc/%s\n",
+				BASE_DIR);
+		return -ENOMEM;
+	}
+
+	/*
+	 * Create per-name subdirectory
+	 */
+	named_dir = proc_mkdir(NAMED_DIR, base_dir);
+	if (!named_dir) {
+		printk(KERN_ERR "Couldn't create dir /proc/%s/%s\n",
+				BASE_DIR, NAMED_DIR);
+		goto cleanup;
+	}
+
+	/*
+	 * Create per-number subdirectory
+	 */
+	numbered_dir = proc_mkdir(NUMBERED_DIR, base_dir);
+	if (!numbered_dir) {
+		printk(KERN_ERR "Couldn't create dir /proc/%s/%s\n",
+				BASE_DIR, NUMBERED_DIR);
+		goto cleanup;
+
+	}
+
+	/*
+	 * Create all named nodes
+	 */
+	entry = srm_named_entries;
+	while (entry->name && entry->id) {
+		if (!proc_create_data(entry->name, 0644, named_dir,
+			     &srm_env_proc_ops, (void *)entry->id))
+			goto cleanup;
+		entry++;
+	}
+
+	/*
+	 * Create all numbered nodes
+	 */
+	for (var_num = 0; var_num <= 255; var_num++) {
+		char name[4];
+		sprintf(name, "%ld", var_num);
+		if (!proc_create_data(name, 0644, numbered_dir,
+			     &srm_env_proc_ops, (void *)var_num))
+			goto cleanup;
+	}
+
+	printk(KERN_INFO "%s: version %s loaded successfully\n", NAME,
+			VERSION);
+
+	return 0;
+
+cleanup:
+	remove_proc_subtree(BASE_DIR, NULL);
+	return -ENOMEM;
+}
+
+static void __exit
+srm_env_exit(void)
+{
+	remove_proc_subtree(BASE_DIR, NULL);
+	printk(KERN_INFO "%s: unloaded successfully\n", NAME);
+}
+
+module_init(srm_env_init);
+module_exit(srm_env_exit);