diff options
Diffstat (limited to 'arch/powerpc/kernel/proc_ppc64.c')
| -rw-r--r-- | arch/powerpc/kernel/proc_ppc64.c | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/proc_ppc64.c b/arch/powerpc/kernel/proc_ppc64.c new file mode 100644 index 00000000000..a1c19502fe8 --- /dev/null +++ b/arch/powerpc/kernel/proc_ppc64.c @@ -0,0 +1,126 @@ +/* + * Copyright (C) 2001 Mike Corrigan & Dave Engebretsen IBM Corporation + * + * 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 + */ + +#include <linux/config.h> +#include <linux/init.h> +#include <linux/mm.h> +#include <linux/proc_fs.h> +#include <linux/slab.h> +#include <linux/kernel.h> + +#include <asm/systemcfg.h> +#include <asm/rtas.h> +#include <asm/uaccess.h> +#include <asm/prom.h> + +static loff_t page_map_seek( struct file *file, loff_t off, int whence); +static ssize_t page_map_read( struct file *file, char __user *buf, size_t nbytes, + loff_t *ppos); +static int page_map_mmap( struct file *file, struct vm_area_struct *vma ); + +static struct file_operations page_map_fops = { + .llseek = page_map_seek, + .read = page_map_read, + .mmap = page_map_mmap +}; + +/* + * 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("ppc64", NULL); + if (!root) + return 1; + + if (!(platform_is_pseries() || _machine == PLATFORM_CELL)) + return 0; + + if (!proc_mkdir("rtas", root)) + return 1; + + if (!proc_symlink("rtas", NULL, "ppc64/rtas")) + return 1; + + return 0; +} +core_initcall(proc_ppc64_create); + +static int __init proc_ppc64_init(void) +{ + struct proc_dir_entry *pde; + + pde = create_proc_entry("ppc64/systemcfg", S_IFREG|S_IRUGO, NULL); + if (!pde) + return 1; + pde->nlink = 1; + pde->data = _systemcfg; + pde->size = PAGE_SIZE; + pde->proc_fops = &page_map_fops; + + return 0; +} +__initcall(proc_ppc64_init); + +static loff_t page_map_seek( struct file *file, loff_t off, int whence) +{ + loff_t new; + struct proc_dir_entry *dp = PDE(file->f_dentry->d_inode); + + switch(whence) { + case 0: + new = off; + break; + case 1: + new = file->f_pos + off; + break; + case 2: + new = dp->size + off; + break; + default: + return -EINVAL; + } + if ( new < 0 || new > dp->size ) + return -EINVAL; + return (file->f_pos = new); +} + +static ssize_t page_map_read( struct file *file, char __user *buf, size_t nbytes, + loff_t *ppos) +{ + struct proc_dir_entry *dp = PDE(file->f_dentry->d_inode); + return simple_read_from_buffer(buf, nbytes, ppos, dp->data, dp->size); +} + +static int page_map_mmap( struct file *file, struct vm_area_struct *vma ) +{ + struct proc_dir_entry *dp = PDE(file->f_dentry->d_inode); + + vma->vm_flags |= VM_SHM | VM_LOCKED; + + if ((vma->vm_end - vma->vm_start) > dp->size) + return -EINVAL; + + remap_pfn_range(vma, vma->vm_start, __pa(dp->data) >> PAGE_SHIFT, + dp->size, vma->vm_page_prot); + return 0; +} + |