/* * 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/slab.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> static loff_t page_map_seek( struct file *file, loff_t off, int whence); static ssize_t page_map_read( struct file *file, char __user *buf, size_t nbytes, loff_t *ppos); static int page_map_mmap( struct file *file, struct vm_area_struct *vma ); static struct file_operations page_map_fops = { .llseek = page_map_seek, .read = page_map_read, .mmap = page_map_mmap }; /* * 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("ppc64", NULL); if (!root) return 1; if (!of_find_node_by_path("/rtas")) return 0; if (!proc_mkdir("rtas", root)) return 1; if (!proc_symlink("rtas", NULL, "ppc64/rtas")) return 1; return 0; } core_initcall(proc_ppc64_create); static int __init proc_ppc64_init(void) { struct proc_dir_entry *pde; pde = create_proc_entry("ppc64/systemcfg", S_IFREG|S_IRUGO, NULL); if (!pde) return 1; pde->nlink = 1; pde->data = vdso_data; pde->size = PAGE_SIZE; pde->proc_fops = &page_map_fops; return 0; } __initcall(proc_ppc64_init); 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_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_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_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; }