1 /* 2 * Copyright (C) 2001 Mike Corrigan & Dave Engebretsen IBM Corporation 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License as published by 6 * the Free Software Foundation; either version 2 of the License, or 7 * (at your option) any later version. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write to the Free Software 16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 17 */ 18 19 #include <linux/init.h> 20 #include <linux/mm.h> 21 #include <linux/proc_fs.h> 22 #include <linux/kernel.h> 23 24 #include <asm/machdep.h> 25 #include <asm/vdso_datapage.h> 26 #include <asm/rtas.h> 27 #include <asm/uaccess.h> 28 #include <asm/prom.h> 29 30 #ifdef CONFIG_PPC64 31 32 static loff_t page_map_seek(struct file *file, loff_t off, int whence) 33 { 34 return fixed_size_llseek(file, off, whence, PAGE_SIZE); 35 } 36 37 static ssize_t page_map_read( struct file *file, char __user *buf, size_t nbytes, 38 loff_t *ppos) 39 { 40 return simple_read_from_buffer(buf, nbytes, ppos, 41 PDE_DATA(file_inode(file)), PAGE_SIZE); 42 } 43 44 static int page_map_mmap( struct file *file, struct vm_area_struct *vma ) 45 { 46 if ((vma->vm_end - vma->vm_start) > PAGE_SIZE) 47 return -EINVAL; 48 49 remap_pfn_range(vma, vma->vm_start, 50 __pa(PDE_DATA(file_inode(file))) >> PAGE_SHIFT, 51 PAGE_SIZE, vma->vm_page_prot); 52 return 0; 53 } 54 55 static const struct file_operations page_map_fops = { 56 .llseek = page_map_seek, 57 .read = page_map_read, 58 .mmap = page_map_mmap 59 }; 60 61 62 static int __init proc_ppc64_init(void) 63 { 64 struct proc_dir_entry *pde; 65 66 pde = proc_create_data("powerpc/systemcfg", S_IFREG|S_IRUGO, NULL, 67 &page_map_fops, vdso_data); 68 if (!pde) 69 return 1; 70 proc_set_size(pde, PAGE_SIZE); 71 72 return 0; 73 } 74 __initcall(proc_ppc64_init); 75 76 #endif /* CONFIG_PPC64 */ 77 78 /* 79 * Create the ppc64 and ppc64/rtas directories early. This allows us to 80 * assume that they have been previously created in drivers. 81 */ 82 static int __init proc_ppc64_create(void) 83 { 84 struct proc_dir_entry *root; 85 86 root = proc_mkdir("powerpc", NULL); 87 if (!root) 88 return 1; 89 90 #ifdef CONFIG_PPC64 91 if (!proc_symlink("ppc64", NULL, "powerpc")) 92 pr_err("Failed to create link /proc/ppc64 -> /proc/powerpc\n"); 93 #endif 94 95 if (!of_find_node_by_path("/rtas")) 96 return 0; 97 98 if (!proc_mkdir("rtas", root)) 99 return 1; 100 101 if (!proc_symlink("rtas", NULL, "powerpc/rtas")) 102 return 1; 103 104 return 0; 105 } 106 core_initcall(proc_ppc64_create); 107