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93 lines
2.0 KiB
93 lines
2.0 KiB
// 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 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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