mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-29 15:14:18 +08:00
359745d783
Remove PDE_DATA() completely and replace it with pde_data(). [akpm@linux-foundation.org: fix naming clash in drivers/nubus/proc.c] [akpm@linux-foundation.org: now fix it properly] Link: https://lkml.kernel.org/r/20211124081956.87711-2-songmuchun@bytedance.com Signed-off-by: Muchun Song <songmuchun@bytedance.com> Acked-by: Christian Brauner <christian.brauner@ubuntu.com> Cc: Alexey Dobriyan <adobriyan@gmail.com> Cc: Alexey Gladkov <gladkov.alexey@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
94 lines
2.0 KiB
C
94 lines
2.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* Copyright (C) 2001 Mike Corrigan & Dave Engebretsen IBM Corporation
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/proc_fs.h>
|
|
#include <linux/kernel.h>
|
|
|
|
#include <asm/machdep.h>
|
|
#include <asm/vdso_datapage.h>
|
|
#include <asm/rtas.h>
|
|
#include <linux/uaccess.h>
|
|
#include <asm/prom.h>
|
|
|
|
#ifdef CONFIG_PPC64
|
|
|
|
static loff_t page_map_seek(struct file *file, loff_t off, int whence)
|
|
{
|
|
return fixed_size_llseek(file, off, whence, PAGE_SIZE);
|
|
}
|
|
|
|
static ssize_t page_map_read( struct file *file, char __user *buf, size_t nbytes,
|
|
loff_t *ppos)
|
|
{
|
|
return simple_read_from_buffer(buf, nbytes, ppos,
|
|
pde_data(file_inode(file)), PAGE_SIZE);
|
|
}
|
|
|
|
static int page_map_mmap( struct file *file, struct vm_area_struct *vma )
|
|
{
|
|
if ((vma->vm_end - vma->vm_start) > PAGE_SIZE)
|
|
return -EINVAL;
|
|
|
|
remap_pfn_range(vma, vma->vm_start,
|
|
__pa(pde_data(file_inode(file))) >> PAGE_SHIFT,
|
|
PAGE_SIZE, vma->vm_page_prot);
|
|
return 0;
|
|
}
|
|
|
|
static const struct proc_ops page_map_proc_ops = {
|
|
.proc_lseek = page_map_seek,
|
|
.proc_read = page_map_read,
|
|
.proc_mmap = page_map_mmap,
|
|
};
|
|
|
|
|
|
static int __init proc_ppc64_init(void)
|
|
{
|
|
struct proc_dir_entry *pde;
|
|
|
|
pde = proc_create_data("powerpc/systemcfg", S_IFREG | 0444, NULL,
|
|
&page_map_proc_ops, vdso_data);
|
|
if (!pde)
|
|
return 1;
|
|
proc_set_size(pde, PAGE_SIZE);
|
|
|
|
return 0;
|
|
}
|
|
__initcall(proc_ppc64_init);
|
|
|
|
#endif /* CONFIG_PPC64 */
|
|
|
|
/*
|
|
* 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("powerpc", NULL);
|
|
if (!root)
|
|
return 1;
|
|
|
|
#ifdef CONFIG_PPC64
|
|
if (!proc_symlink("ppc64", NULL, "powerpc"))
|
|
pr_err("Failed to create link /proc/ppc64 -> /proc/powerpc\n");
|
|
#endif
|
|
|
|
if (!of_find_node_by_path("/rtas"))
|
|
return 0;
|
|
|
|
if (!proc_mkdir("rtas", root))
|
|
return 1;
|
|
|
|
if (!proc_symlink("rtas", NULL, "powerpc/rtas"))
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
core_initcall(proc_ppc64_create);
|