94 lines
2.0 KiB
C
94 lines
2.0 KiB
C
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// 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 <linux/of.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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#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 proc_ops page_map_proc_ops = {
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.proc_lseek = page_map_seek,
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.proc_read = page_map_read,
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.proc_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_proc_ops, 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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