/* * Copyright (C) 2001 Mike Corrigan & Dave Engebretsen IBM Corporation * * 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; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA */ #include <linux/init.h>#include <linux/mm.h>#include <linux/proc_fs.h>#include <linux/kernel.h> #include <asm/machdep.h>#include <asm/vdso_datapage.h>#include <asm/rtas.h>#include <asm/uaccess.h>#include <asm/prom.h> #ifdef CONFIG_PPC64 static loff_t page_map_seek( struct file *file, loff_t off, int whence){	loff_t new;	struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode); 	switch(whence) {	case 0:		new = off;		break;	case 1:		new = file->f_pos + off;		break;	case 2:		new = dp->size + off;		break;	default:		return -EINVAL;	}	if ( new < 0 || new > dp->size )		return -EINVAL;	return (file->f_pos = new);} static ssize_t page_map_read( struct file *file, char __user *buf, size_t nbytes,			      loff_t *ppos){	struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);	return simple_read_from_buffer(buf, nbytes, ppos, dp->data, dp->size);} static int page_map_mmap( struct file *file, struct vm_area_struct *vma ){	struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode); 	if ((vma->vm_end - vma->vm_start) > dp->size)		return -EINVAL; 	remap_pfn_range(vma, vma->vm_start, __pa(dp->data) >> PAGE_SHIFT,						dp->size, vma->vm_page_prot);	return 0;} static const struct file_operations page_map_fops = {	.llseek	= page_map_seek,	.read	= page_map_read,	.mmap	= page_map_mmap};  static int __init proc_ppc64_init(void){	struct proc_dir_entry *pde; 	pde = proc_create_data("powerpc/systemcfg", S_IFREG|S_IRUGO, NULL,			       &page_map_fops, vdso_data);	if (!pde)		return 1;	pde->size = PAGE_SIZE; 	return 0;}__initcall(proc_ppc64_init); #endif /* CONFIG_PPC64 */ /* * Create the ppc64 and ppc64/rtas directories early. This allows us to * assume that they have been previously created in drivers. */static int __init proc_ppc64_create(void){	struct proc_dir_entry *root; 	root = proc_mkdir("powerpc", NULL);	if (!root)		return 1; #ifdef CONFIG_PPC64	if (!proc_symlink("ppc64", NULL, "powerpc"))		pr_err("Failed to create link /proc/ppc64 -> /proc/powerpc\n");#endif 	if (!of_find_node_by_path("/rtas"))		return 0; 	if (!proc_mkdir("rtas", root))		return 1; 	if (!proc_symlink("rtas", NULL, "powerpc/rtas"))		return 1; 	return 0;}core_initcall(proc_ppc64_create);