1 files changed, 128 insertions, 0 deletions

diff --git a/arch/ppc64/kernel/proc_ppc64.c b/arch/ppc64/kernel/proc_ppc64.c
new file mode 100644
index 000000000000..0914b0669b05
--- /dev/null
+++ b/arch/ppc64/kernel/proc_ppc64.c
@@ -0,0 +1,128 @@
+/*
+ * arch/ppc64/kernel/proc_ppc64.c
+ *
+ * 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 (!(systemcfg->platform & PLATFORM_PSERIES))
+                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;
+}
+