cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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proc.c (3212B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 *	Procfs interface for the Zorro bus.
      4 *
      5 *	Copyright (C) 1998-2003 Geert Uytterhoeven
      6 *
      7 *	Heavily based on the procfs interface for the PCI bus, which is
      8 *
      9 *	Copyright (C) 1997, 1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
     10 */
     11
     12#include <linux/types.h>
     13#include <linux/zorro.h>
     14#include <linux/proc_fs.h>
     15#include <linux/seq_file.h>
     16#include <linux/init.h>
     17#include <linux/export.h>
     18
     19#include <asm/byteorder.h>
     20#include <linux/uaccess.h>
     21#include <asm/amigahw.h>
     22#include <asm/setup.h>
     23
     24static loff_t
     25proc_bus_zorro_lseek(struct file *file, loff_t off, int whence)
     26{
     27	return fixed_size_llseek(file, off, whence, sizeof(struct ConfigDev));
     28}
     29
     30static ssize_t
     31proc_bus_zorro_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
     32{
     33	struct zorro_dev *z = pde_data(file_inode(file));
     34	struct ConfigDev cd;
     35	loff_t pos = *ppos;
     36
     37	if (pos >= sizeof(struct ConfigDev))
     38		return 0;
     39	if (nbytes >= sizeof(struct ConfigDev))
     40		nbytes = sizeof(struct ConfigDev);
     41	if (pos + nbytes > sizeof(struct ConfigDev))
     42		nbytes = sizeof(struct ConfigDev) - pos;
     43
     44	/* Construct a ConfigDev */
     45	memset(&cd, 0, sizeof(cd));
     46	cd.cd_Rom = z->rom;
     47	cd.cd_SlotAddr = cpu_to_be16(z->slotaddr);
     48	cd.cd_SlotSize = cpu_to_be16(z->slotsize);
     49	cd.cd_BoardAddr = cpu_to_be32(zorro_resource_start(z));
     50	cd.cd_BoardSize = cpu_to_be32(zorro_resource_len(z));
     51
     52	if (copy_to_user(buf, (void *)&cd + pos, nbytes))
     53		return -EFAULT;
     54	*ppos += nbytes;
     55
     56	return nbytes;
     57}
     58
     59static const struct proc_ops bus_zorro_proc_ops = {
     60	.proc_lseek	= proc_bus_zorro_lseek,
     61	.proc_read	= proc_bus_zorro_read,
     62};
     63
     64static void * zorro_seq_start(struct seq_file *m, loff_t *pos)
     65{
     66	return (*pos < zorro_num_autocon) ? pos : NULL;
     67}
     68
     69static void * zorro_seq_next(struct seq_file *m, void *v, loff_t *pos)
     70{
     71	(*pos)++;
     72	return (*pos < zorro_num_autocon) ? pos : NULL;
     73}
     74
     75static void zorro_seq_stop(struct seq_file *m, void *v)
     76{
     77}
     78
     79static int zorro_seq_show(struct seq_file *m, void *v)
     80{
     81	unsigned int slot = *(loff_t *)v;
     82	struct zorro_dev *z = &zorro_autocon[slot];
     83
     84	seq_printf(m, "%02x\t%08x\t%08lx\t%08lx\t%02x\n", slot, z->id,
     85		   (unsigned long)zorro_resource_start(z),
     86		   (unsigned long)zorro_resource_len(z),
     87		   z->rom.er_Type);
     88	return 0;
     89}
     90
     91static const struct seq_operations zorro_devices_seq_ops = {
     92	.start = zorro_seq_start,
     93	.next  = zorro_seq_next,
     94	.stop  = zorro_seq_stop,
     95	.show  = zorro_seq_show,
     96};
     97
     98static struct proc_dir_entry *proc_bus_zorro_dir;
     99
    100static int __init zorro_proc_attach_device(unsigned int slot)
    101{
    102	struct proc_dir_entry *entry;
    103	char name[4];
    104
    105	sprintf(name, "%02x", slot);
    106	entry = proc_create_data(name, 0, proc_bus_zorro_dir,
    107				 &bus_zorro_proc_ops,
    108				 &zorro_autocon[slot]);
    109	if (!entry)
    110		return -ENOMEM;
    111	proc_set_size(entry, sizeof(struct zorro_dev));
    112	return 0;
    113}
    114
    115static int __init zorro_proc_init(void)
    116{
    117	unsigned int slot;
    118
    119	if (MACH_IS_AMIGA && AMIGAHW_PRESENT(ZORRO)) {
    120		proc_bus_zorro_dir = proc_mkdir("bus/zorro", NULL);
    121		proc_create_seq("devices", 0, proc_bus_zorro_dir,
    122			    &zorro_devices_seq_ops);
    123		for (slot = 0; slot < zorro_num_autocon; slot++)
    124			zorro_proc_attach_device(slot);
    125	}
    126	return 0;
    127}
    128
    129device_initcall(zorro_proc_init);