forked from luck/tmp_suning_uos_patched
00977a59b9
Many struct file_operations in the kernel can be "const". Marking them const moves these to the .rodata section, which avoids false sharing with potential dirty data. In addition it'll catch accidental writes at compile time to these shared resources. Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
140 lines
3.2 KiB
C
140 lines
3.2 KiB
C
/*
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* $Id: proc.c,v 1.1.2.1 1998/06/07 23:21:01 geert Exp $
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*
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* Procfs interface for the Zorro bus.
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*
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* Copyright (C) 1998-2003 Geert Uytterhoeven
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*
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* Heavily based on the procfs interface for the PCI bus, which is
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*
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* Copyright (C) 1997, 1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
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*/
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#include <linux/types.h>
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#include <linux/zorro.h>
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#include <linux/proc_fs.h>
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#include <linux/init.h>
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#include <linux/smp_lock.h>
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#include <asm/uaccess.h>
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#include <asm/amigahw.h>
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#include <asm/setup.h>
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static loff_t
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proc_bus_zorro_lseek(struct file *file, loff_t off, int whence)
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{
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loff_t new = -1;
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lock_kernel();
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switch (whence) {
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case 0:
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new = off;
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break;
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case 1:
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new = file->f_pos + off;
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break;
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case 2:
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new = sizeof(struct ConfigDev) + off;
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break;
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}
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if (new < 0 || new > sizeof(struct ConfigDev)) {
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unlock_kernel();
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return -EINVAL;
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}
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unlock_kernel();
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return (file->f_pos = new);
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}
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static ssize_t
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proc_bus_zorro_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
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{
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struct inode *ino = file->f_path.dentry->d_inode;
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struct proc_dir_entry *dp = PDE(ino);
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struct zorro_dev *z = dp->data;
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struct ConfigDev cd;
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loff_t pos = *ppos;
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if (pos >= sizeof(struct ConfigDev))
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return 0;
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if (nbytes >= sizeof(struct ConfigDev))
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nbytes = sizeof(struct ConfigDev);
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if (pos + nbytes > sizeof(struct ConfigDev))
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nbytes = sizeof(struct ConfigDev) - pos;
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/* Construct a ConfigDev */
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memset(&cd, 0, sizeof(cd));
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cd.cd_Rom = z->rom;
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cd.cd_SlotAddr = z->slotaddr;
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cd.cd_SlotSize = z->slotsize;
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cd.cd_BoardAddr = (void *)zorro_resource_start(z);
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cd.cd_BoardSize = zorro_resource_len(z);
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if (copy_to_user(buf, &cd, nbytes))
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return -EFAULT;
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*ppos += nbytes;
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return nbytes;
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}
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static const struct file_operations proc_bus_zorro_operations = {
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.llseek = proc_bus_zorro_lseek,
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.read = proc_bus_zorro_read,
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};
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static int
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get_zorro_dev_info(char *buf, char **start, off_t pos, int count)
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{
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u_int slot;
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off_t at = 0;
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int len, cnt;
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for (slot = cnt = 0; slot < zorro_num_autocon && count > cnt; slot++) {
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struct zorro_dev *z = &zorro_autocon[slot];
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len = sprintf(buf, "%02x\t%08x\t%08lx\t%08lx\t%02x\n", slot,
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z->id, zorro_resource_start(z),
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zorro_resource_len(z), z->rom.er_Type);
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at += len;
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if (at >= pos) {
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if (!*start) {
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*start = buf + (pos - (at - len));
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cnt = at - pos;
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} else
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cnt += len;
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buf += len;
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}
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}
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return (count > cnt) ? cnt : count;
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}
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static struct proc_dir_entry *proc_bus_zorro_dir;
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static int __init zorro_proc_attach_device(u_int slot)
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{
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struct proc_dir_entry *entry;
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char name[4];
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sprintf(name, "%02x", slot);
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entry = create_proc_entry(name, 0, proc_bus_zorro_dir);
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if (!entry)
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return -ENOMEM;
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entry->proc_fops = &proc_bus_zorro_operations;
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entry->data = &zorro_autocon[slot];
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entry->size = sizeof(struct zorro_dev);
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return 0;
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}
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static int __init zorro_proc_init(void)
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{
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u_int slot;
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if (MACH_IS_AMIGA && AMIGAHW_PRESENT(ZORRO)) {
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proc_bus_zorro_dir = proc_mkdir("zorro", proc_bus);
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create_proc_info_entry("devices", 0, proc_bus_zorro_dir,
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get_zorro_dev_info);
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for (slot = 0; slot < zorro_num_autocon; slot++)
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zorro_proc_attach_device(slot);
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}
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return 0;
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}
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__initcall(zorro_proc_init);
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