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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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631 lines
14 KiB
C
631 lines
14 KiB
C
![]() |
/*
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* Linux/SPARC PROM Configuration Driver
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* Copyright (C) 1996 Thomas K. Dyas (tdyas@noc.rutgers.edu)
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* Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be)
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*
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* This character device driver allows user programs to access the
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* PROM device tree. It is compatible with the SunOS /dev/openprom
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* driver and the NetBSD /dev/openprom driver. The SunOS eeprom
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* utility works without any modifications.
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*
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* The driver uses a minor number under the misc device major. The
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* file read/write mode determines the type of access to the PROM.
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* Interrupts are disabled whenever the driver calls into the PROM for
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* sanity's sake.
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*/
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/* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#define PROMLIB_INTERNAL
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/miscdevice.h>
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#include <linux/init.h>
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#include <linux/fs.h>
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#include <asm/oplib.h>
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#include <asm/system.h>
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#include <asm/uaccess.h>
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#include <asm/openpromio.h>
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#ifdef CONFIG_PCI
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#include <linux/pci.h>
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#include <asm/pbm.h>
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#endif
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/* Private data kept by the driver for each descriptor. */
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typedef struct openprom_private_data
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{
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int current_node; /* Current node for SunOS ioctls. */
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int lastnode; /* Last valid node used by BSD ioctls. */
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} DATA;
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/* ID of the PROM node containing all of the EEPROM options. */
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static int options_node = 0;
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/*
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* Copy an openpromio structure into kernel space from user space.
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* This routine does error checking to make sure that all memory
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* accesses are within bounds. A pointer to the allocated openpromio
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* structure will be placed in "*opp_p". Return value is the length
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* of the user supplied buffer.
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*/
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static int copyin(struct openpromio __user *info, struct openpromio **opp_p)
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{
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unsigned int bufsize;
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if (!info || !opp_p)
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return -EFAULT;
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if (get_user(bufsize, &info->oprom_size))
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return -EFAULT;
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if (bufsize == 0)
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return -EINVAL;
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/* If the bufsize is too large, just limit it.
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* Fix from Jason Rappleye.
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*/
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if (bufsize > OPROMMAXPARAM)
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bufsize = OPROMMAXPARAM;
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if (!(*opp_p = kmalloc(sizeof(int) + bufsize + 1, GFP_KERNEL)))
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return -ENOMEM;
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memset(*opp_p, 0, sizeof(int) + bufsize + 1);
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if (copy_from_user(&(*opp_p)->oprom_array,
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&info->oprom_array, bufsize)) {
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kfree(*opp_p);
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return -EFAULT;
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}
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return bufsize;
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}
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static int getstrings(struct openpromio __user *info, struct openpromio **opp_p)
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{
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int n, bufsize;
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char c;
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if (!info || !opp_p)
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return -EFAULT;
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if (!(*opp_p = kmalloc(sizeof(int) + OPROMMAXPARAM + 1, GFP_KERNEL)))
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return -ENOMEM;
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memset(*opp_p, 0, sizeof(int) + OPROMMAXPARAM + 1);
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(*opp_p)->oprom_size = 0;
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n = bufsize = 0;
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while ((n < 2) && (bufsize < OPROMMAXPARAM)) {
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if (get_user(c, &info->oprom_array[bufsize])) {
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kfree(*opp_p);
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return -EFAULT;
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}
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if (c == '\0')
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n++;
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(*opp_p)->oprom_array[bufsize++] = c;
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}
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if (!n) {
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kfree(*opp_p);
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return -EINVAL;
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}
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return bufsize;
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}
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/*
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* Copy an openpromio structure in kernel space back to user space.
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*/
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static int copyout(void __user *info, struct openpromio *opp, int len)
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{
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if (copy_to_user(info, opp, len))
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return -EFAULT;
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return 0;
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}
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/*
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* SunOS and Solaris /dev/openprom ioctl calls.
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*/
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static int openprom_sunos_ioctl(struct inode * inode, struct file * file,
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unsigned int cmd, unsigned long arg, int node)
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{
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DATA *data = (DATA *) file->private_data;
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char buffer[OPROMMAXPARAM+1], *buf;
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struct openpromio *opp;
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int bufsize, len, error = 0;
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static int cnt;
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void __user *argp = (void __user *)arg;
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if (cmd == OPROMSETOPT)
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bufsize = getstrings(argp, &opp);
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else
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bufsize = copyin(argp, &opp);
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if (bufsize < 0)
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return bufsize;
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switch (cmd) {
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case OPROMGETOPT:
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case OPROMGETPROP:
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len = prom_getproplen(node, opp->oprom_array);
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if (len <= 0 || len > bufsize) {
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error = copyout(argp, opp, sizeof(int));
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break;
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}
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len = prom_getproperty(node, opp->oprom_array, buffer, bufsize);
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memcpy(opp->oprom_array, buffer, len);
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opp->oprom_array[len] = '\0';
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opp->oprom_size = len;
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error = copyout(argp, opp, sizeof(int) + bufsize);
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break;
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case OPROMNXTOPT:
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case OPROMNXTPROP:
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buf = prom_nextprop(node, opp->oprom_array, buffer);
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len = strlen(buf);
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if (len == 0 || len + 1 > bufsize) {
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error = copyout(argp, opp, sizeof(int));
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break;
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}
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memcpy(opp->oprom_array, buf, len);
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opp->oprom_array[len] = '\0';
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opp->oprom_size = ++len;
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error = copyout(argp, opp, sizeof(int) + bufsize);
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break;
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case OPROMSETOPT:
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case OPROMSETOPT2:
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buf = opp->oprom_array + strlen(opp->oprom_array) + 1;
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len = opp->oprom_array + bufsize - buf;
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error = prom_setprop(options_node, opp->oprom_array,
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buf, len);
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if (error < 0)
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error = -EINVAL;
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break;
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case OPROMNEXT:
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case OPROMCHILD:
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case OPROMSETCUR:
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if (bufsize < sizeof(int)) {
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error = -EINVAL;
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break;
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}
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node = *((int *) opp->oprom_array);
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switch (cmd) {
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case OPROMNEXT: node = __prom_getsibling(node); break;
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case OPROMCHILD: node = __prom_getchild(node); break;
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case OPROMSETCUR: break;
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}
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data->current_node = node;
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*((int *)opp->oprom_array) = node;
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opp->oprom_size = sizeof(int);
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error = copyout(argp, opp, bufsize + sizeof(int));
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break;
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case OPROMPCI2NODE:
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error = -EINVAL;
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if (bufsize >= 2*sizeof(int)) {
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#ifdef CONFIG_PCI
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struct pci_dev *pdev;
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struct pcidev_cookie *pcp;
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pdev = pci_find_slot (((int *) opp->oprom_array)[0],
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((int *) opp->oprom_array)[1]);
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pcp = pdev->sysdata;
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if (pcp != NULL && pcp->prom_node != -1 && pcp->prom_node) {
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node = pcp->prom_node;
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data->current_node = node;
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*((int *)opp->oprom_array) = node;
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opp->oprom_size = sizeof(int);
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error = copyout(argp, opp, bufsize + sizeof(int));
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}
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#endif
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}
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break;
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case OPROMPATH2NODE:
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node = prom_finddevice(opp->oprom_array);
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data->current_node = node;
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*((int *)opp->oprom_array) = node;
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opp->oprom_size = sizeof(int);
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error = copyout(argp, opp, bufsize + sizeof(int));
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break;
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case OPROMGETBOOTARGS:
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buf = saved_command_line;
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len = strlen(buf);
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if (len > bufsize) {
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error = -EINVAL;
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break;
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}
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strcpy(opp->oprom_array, buf);
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opp->oprom_size = len;
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error = copyout(argp, opp, bufsize + sizeof(int));
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break;
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case OPROMU2P:
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case OPROMGETCONS:
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case OPROMGETFBNAME:
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if (cnt++ < 10)
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printk(KERN_INFO "openprom_sunos_ioctl: unimplemented ioctl\n");
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error = -EINVAL;
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break;
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default:
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if (cnt++ < 10)
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printk(KERN_INFO "openprom_sunos_ioctl: cmd 0x%X, arg 0x%lX\n", cmd, arg);
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error = -EINVAL;
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break;
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}
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kfree(opp);
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return error;
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}
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/* Return nonzero if a specific node is in the PROM device tree. */
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static int intree(int root, int node)
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{
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for (; root != 0; root = prom_getsibling(root))
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if (root == node || intree(prom_getchild(root),node))
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return 1;
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return 0;
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}
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/* Return nonzero if a specific node is "valid". */
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static int goodnode(int n, DATA *data)
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{
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if (n == data->lastnode || n == prom_root_node || n == options_node)
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return 1;
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if (n == 0 || n == -1 || !intree(prom_root_node,n))
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return 0;
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data->lastnode = n;
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return 1;
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}
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/* Copy in a whole string from userspace into kernelspace. */
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static int copyin_string(char __user *user, size_t len, char **ptr)
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{
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char *tmp;
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if ((ssize_t)len < 0 || (ssize_t)(len + 1) < 0)
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return -EINVAL;
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tmp = kmalloc(len + 1, GFP_KERNEL);
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if (!tmp)
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return -ENOMEM;
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if(copy_from_user(tmp, user, len)) {
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kfree(tmp);
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return -EFAULT;
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}
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tmp[len] = '\0';
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*ptr = tmp;
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return 0;
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}
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/*
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* NetBSD /dev/openprom ioctl calls.
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*/
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static int openprom_bsd_ioctl(struct inode * inode, struct file * file,
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unsigned int cmd, unsigned long arg)
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{
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DATA *data = (DATA *) file->private_data;
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void __user *argp = (void __user *)arg;
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struct opiocdesc op;
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int error, node, len;
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char *str, *tmp;
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char buffer[64];
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static int cnt;
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switch (cmd) {
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case OPIOCGET:
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if (copy_from_user(&op, argp, sizeof(op)))
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return -EFAULT;
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|
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|
if (!goodnode(op.op_nodeid,data))
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return -EINVAL;
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|
|
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error = copyin_string(op.op_name, op.op_namelen, &str);
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if (error)
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return error;
|
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|
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len = prom_getproplen(op.op_nodeid,str);
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|
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|
if (len > op.op_buflen) {
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kfree(str);
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|
return -ENOMEM;
|
||
|
}
|
||
|
|
||
|
op.op_buflen = len;
|
||
|
|
||
|
if (len <= 0) {
|
||
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kfree(str);
|
||
|
/* Verified by the above copy_from_user */
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if (__copy_to_user(argp, &op,
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||
|
sizeof(op)))
|
||
|
return -EFAULT;
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
tmp = kmalloc(len + 1, GFP_KERNEL);
|
||
|
if (!tmp) {
|
||
|
kfree(str);
|
||
|
return -ENOMEM;
|
||
|
}
|
||
|
|
||
|
prom_getproperty(op.op_nodeid, str, tmp, len);
|
||
|
|
||
|
tmp[len] = '\0';
|
||
|
|
||
|
if (__copy_to_user(argp, &op, sizeof(op)) != 0
|
||
|
|| copy_to_user(op.op_buf, tmp, len) != 0)
|
||
|
error = -EFAULT;
|
||
|
|
||
|
kfree(tmp);
|
||
|
kfree(str);
|
||
|
|
||
|
return error;
|
||
|
|
||
|
case OPIOCNEXTPROP:
|
||
|
if (copy_from_user(&op, argp, sizeof(op)))
|
||
|
return -EFAULT;
|
||
|
|
||
|
if (!goodnode(op.op_nodeid,data))
|
||
|
return -EINVAL;
|
||
|
|
||
|
error = copyin_string(op.op_name, op.op_namelen, &str);
|
||
|
if (error)
|
||
|
return error;
|
||
|
|
||
|
tmp = prom_nextprop(op.op_nodeid,str,buffer);
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||
|
|
||
|
if (tmp) {
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||
|
len = strlen(tmp);
|
||
|
if (len > op.op_buflen)
|
||
|
len = op.op_buflen;
|
||
|
else
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|
op.op_buflen = len;
|
||
|
} else {
|
||
|
len = op.op_buflen = 0;
|
||
|
}
|
||
|
|
||
|
if (!access_ok(VERIFY_WRITE, argp, sizeof(op))) {
|
||
|
kfree(str);
|
||
|
return -EFAULT;
|
||
|
}
|
||
|
|
||
|
if (!access_ok(VERIFY_WRITE, op.op_buf, len)) {
|
||
|
kfree(str);
|
||
|
return -EFAULT;
|
||
|
}
|
||
|
|
||
|
error = __copy_to_user(argp, &op, sizeof(op));
|
||
|
if (!error) error = __copy_to_user(op.op_buf, tmp, len);
|
||
|
|
||
|
kfree(str);
|
||
|
|
||
|
return error;
|
||
|
|
||
|
case OPIOCSET:
|
||
|
if (copy_from_user(&op, argp, sizeof(op)))
|
||
|
return -EFAULT;
|
||
|
|
||
|
if (!goodnode(op.op_nodeid,data))
|
||
|
return -EINVAL;
|
||
|
|
||
|
error = copyin_string(op.op_name, op.op_namelen, &str);
|
||
|
if (error)
|
||
|
return error;
|
||
|
|
||
|
error = copyin_string(op.op_buf, op.op_buflen, &tmp);
|
||
|
if (error) {
|
||
|
kfree(str);
|
||
|
return error;
|
||
|
}
|
||
|
|
||
|
len = prom_setprop(op.op_nodeid,str,tmp,op.op_buflen+1);
|
||
|
|
||
|
if (len != op.op_buflen)
|
||
|
return -EINVAL;
|
||
|
|
||
|
kfree(str);
|
||
|
kfree(tmp);
|
||
|
|
||
|
return 0;
|
||
|
|
||
|
case OPIOCGETOPTNODE:
|
||
|
if (copy_to_user(argp, &options_node, sizeof(int)))
|
||
|
return -EFAULT;
|
||
|
return 0;
|
||
|
|
||
|
case OPIOCGETNEXT:
|
||
|
case OPIOCGETCHILD:
|
||
|
if (copy_from_user(&node, argp, sizeof(int)))
|
||
|
return -EFAULT;
|
||
|
|
||
|
if (cmd == OPIOCGETNEXT)
|
||
|
node = __prom_getsibling(node);
|
||
|
else
|
||
|
node = __prom_getchild(node);
|
||
|
|
||
|
if (__copy_to_user(argp, &node, sizeof(int)))
|
||
|
return -EFAULT;
|
||
|
|
||
|
return 0;
|
||
|
|
||
|
default:
|
||
|
if (cnt++ < 10)
|
||
|
printk(KERN_INFO "openprom_bsd_ioctl: cmd 0x%X\n", cmd);
|
||
|
return -EINVAL;
|
||
|
|
||
|
}
|
||
|
}
|
||
|
|
||
|
|
||
|
/*
|
||
|
* Handoff control to the correct ioctl handler.
|
||
|
*/
|
||
|
static int openprom_ioctl(struct inode * inode, struct file * file,
|
||
|
unsigned int cmd, unsigned long arg)
|
||
|
{
|
||
|
DATA *data = (DATA *) file->private_data;
|
||
|
static int cnt;
|
||
|
|
||
|
switch (cmd) {
|
||
|
case OPROMGETOPT:
|
||
|
case OPROMNXTOPT:
|
||
|
if ((file->f_mode & FMODE_READ) == 0)
|
||
|
return -EPERM;
|
||
|
return openprom_sunos_ioctl(inode, file, cmd, arg,
|
||
|
options_node);
|
||
|
|
||
|
case OPROMSETOPT:
|
||
|
case OPROMSETOPT2:
|
||
|
if ((file->f_mode & FMODE_WRITE) == 0)
|
||
|
return -EPERM;
|
||
|
return openprom_sunos_ioctl(inode, file, cmd, arg,
|
||
|
options_node);
|
||
|
|
||
|
case OPROMNEXT:
|
||
|
case OPROMCHILD:
|
||
|
case OPROMGETPROP:
|
||
|
case OPROMNXTPROP:
|
||
|
if ((file->f_mode & FMODE_READ) == 0)
|
||
|
return -EPERM;
|
||
|
return openprom_sunos_ioctl(inode, file, cmd, arg,
|
||
|
data->current_node);
|
||
|
|
||
|
case OPROMU2P:
|
||
|
case OPROMGETCONS:
|
||
|
case OPROMGETFBNAME:
|
||
|
case OPROMGETBOOTARGS:
|
||
|
case OPROMSETCUR:
|
||
|
case OPROMPCI2NODE:
|
||
|
case OPROMPATH2NODE:
|
||
|
if ((file->f_mode & FMODE_READ) == 0)
|
||
|
return -EPERM;
|
||
|
return openprom_sunos_ioctl(inode, file, cmd, arg, 0);
|
||
|
|
||
|
case OPIOCGET:
|
||
|
case OPIOCNEXTPROP:
|
||
|
case OPIOCGETOPTNODE:
|
||
|
case OPIOCGETNEXT:
|
||
|
case OPIOCGETCHILD:
|
||
|
if ((file->f_mode & FMODE_READ) == 0)
|
||
|
return -EBADF;
|
||
|
return openprom_bsd_ioctl(inode,file,cmd,arg);
|
||
|
|
||
|
case OPIOCSET:
|
||
|
if ((file->f_mode & FMODE_WRITE) == 0)
|
||
|
return -EBADF;
|
||
|
return openprom_bsd_ioctl(inode,file,cmd,arg);
|
||
|
|
||
|
default:
|
||
|
if (cnt++ < 10)
|
||
|
printk("openprom_ioctl: cmd 0x%X, arg 0x%lX\n", cmd, arg);
|
||
|
return -EINVAL;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
static int openprom_open(struct inode * inode, struct file * file)
|
||
|
{
|
||
|
DATA *data;
|
||
|
|
||
|
data = (DATA *) kmalloc(sizeof(DATA), GFP_KERNEL);
|
||
|
if (!data)
|
||
|
return -ENOMEM;
|
||
|
|
||
|
data->current_node = prom_root_node;
|
||
|
data->lastnode = prom_root_node;
|
||
|
file->private_data = (void *)data;
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int openprom_release(struct inode * inode, struct file * file)
|
||
|
{
|
||
|
kfree(file->private_data);
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static struct file_operations openprom_fops = {
|
||
|
.owner = THIS_MODULE,
|
||
|
.llseek = no_llseek,
|
||
|
.ioctl = openprom_ioctl,
|
||
|
.open = openprom_open,
|
||
|
.release = openprom_release,
|
||
|
};
|
||
|
|
||
|
static struct miscdevice openprom_dev = {
|
||
|
SUN_OPENPROM_MINOR, "openprom", &openprom_fops
|
||
|
};
|
||
|
|
||
|
static int __init openprom_init(void)
|
||
|
{
|
||
|
int error;
|
||
|
|
||
|
error = misc_register(&openprom_dev);
|
||
|
if (error) {
|
||
|
printk(KERN_ERR "openprom: unable to get misc minor\n");
|
||
|
return error;
|
||
|
}
|
||
|
|
||
|
options_node = prom_getchild(prom_root_node);
|
||
|
options_node = prom_searchsiblings(options_node,"options");
|
||
|
|
||
|
if (options_node == 0 || options_node == -1) {
|
||
|
printk(KERN_ERR "openprom: unable to find options node\n");
|
||
|
misc_deregister(&openprom_dev);
|
||
|
return -EIO;
|
||
|
}
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static void __exit openprom_cleanup(void)
|
||
|
{
|
||
|
misc_deregister(&openprom_dev);
|
||
|
}
|
||
|
|
||
|
module_init(openprom_init);
|
||
|
module_exit(openprom_cleanup);
|
||
|
MODULE_LICENSE("GPL");
|