1a59d1b8e0
Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1334 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
94 lines
2 KiB
C
94 lines
2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2001 Mike Corrigan & Dave Engebretsen IBM Corporation
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*/
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#include <linux/init.h>
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#include <linux/mm.h>
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#include <linux/proc_fs.h>
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#include <linux/kernel.h>
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#include <asm/machdep.h>
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#include <asm/vdso_datapage.h>
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#include <asm/rtas.h>
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#include <linux/uaccess.h>
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#include <asm/prom.h>
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#ifdef CONFIG_PPC64
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static loff_t page_map_seek(struct file *file, loff_t off, int whence)
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{
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return fixed_size_llseek(file, off, whence, PAGE_SIZE);
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}
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static ssize_t page_map_read( struct file *file, char __user *buf, size_t nbytes,
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loff_t *ppos)
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{
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return simple_read_from_buffer(buf, nbytes, ppos,
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PDE_DATA(file_inode(file)), PAGE_SIZE);
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}
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static int page_map_mmap( struct file *file, struct vm_area_struct *vma )
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{
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if ((vma->vm_end - vma->vm_start) > PAGE_SIZE)
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return -EINVAL;
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remap_pfn_range(vma, vma->vm_start,
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__pa(PDE_DATA(file_inode(file))) >> PAGE_SHIFT,
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PAGE_SIZE, vma->vm_page_prot);
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return 0;
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}
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static const struct file_operations page_map_fops = {
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.llseek = page_map_seek,
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.read = page_map_read,
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.mmap = page_map_mmap
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};
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static int __init proc_ppc64_init(void)
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{
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struct proc_dir_entry *pde;
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pde = proc_create_data("powerpc/systemcfg", S_IFREG | 0444, NULL,
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&page_map_fops, vdso_data);
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if (!pde)
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return 1;
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proc_set_size(pde, PAGE_SIZE);
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return 0;
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}
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__initcall(proc_ppc64_init);
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#endif /* CONFIG_PPC64 */
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/*
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* Create the ppc64 and ppc64/rtas directories early. This allows us to
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* assume that they have been previously created in drivers.
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*/
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static int __init proc_ppc64_create(void)
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{
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struct proc_dir_entry *root;
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root = proc_mkdir("powerpc", NULL);
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if (!root)
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return 1;
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#ifdef CONFIG_PPC64
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if (!proc_symlink("ppc64", NULL, "powerpc"))
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pr_err("Failed to create link /proc/ppc64 -> /proc/powerpc\n");
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#endif
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if (!of_find_node_by_path("/rtas"))
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return 0;
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if (!proc_mkdir("rtas", root))
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return 1;
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if (!proc_symlink("rtas", NULL, "powerpc/rtas"))
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return 1;
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return 0;
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}
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core_initcall(proc_ppc64_create);
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