diff options
Diffstat (limited to 'arch/powerpc/kernel/proc_powerpc.c')
-rw-r--r-- | arch/powerpc/kernel/proc_powerpc.c | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/proc_powerpc.c b/arch/powerpc/kernel/proc_powerpc.c new file mode 100644 index 0000000000..b109cd7b5d --- /dev/null +++ b/arch/powerpc/kernel/proc_powerpc.c @@ -0,0 +1,93 @@ +// 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 <linux/of.h> + +#include <asm/machdep.h> +#include <asm/vdso_datapage.h> +#include <asm/rtas.h> +#include <linux/uaccess.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); |