1 files changed, 150 insertions, 0 deletions

diff --git a/arch/um/drivers/mmapper_kern.c b/arch/um/drivers/mmapper_kern.c
new file mode 100644
index 000000000000..a63231dffe05
--- /dev/null
+++ b/arch/um/drivers/mmapper_kern.c
@@ -0,0 +1,150 @@
+/*
+ * arch/um/drivers/mmapper_kern.c
+ *
+ * BRIEF MODULE DESCRIPTION
+ *
+ * Copyright (C) 2000 RidgeRun, Inc.
+ * Author: RidgeRun, Inc.
+ *         Greg Lonnon glonnon@ridgerun.com or info@ridgerun.com
+ *
+ */
+
+#include <linux/types.h>
+#include <linux/kdev_t.h>
+#include <linux/time.h>
+#include <linux/devfs_fs_kernel.h>
+#include <linux/module.h>
+#include <linux/mm.h> 
+#include <linux/slab.h>
+#include <linux/init.h> 
+#include <linux/smp_lock.h>
+#include <asm/uaccess.h>
+#include <asm/irq.h>
+#include <asm/pgtable.h>
+#include "mem_user.h"
+#include "user_util.h"
+ 
+/* These are set in mmapper_init, which is called at boot time */
+static unsigned long mmapper_size;
+static unsigned long p_buf = 0;
+static char *v_buf = NULL;
+
+static ssize_t
+mmapper_read(struct file *file, char *buf, size_t count, loff_t *ppos)
+{
+        if(*ppos > mmapper_size)
+                return -EINVAL;
+
+        if(count + *ppos > mmapper_size)
+                count = count + *ppos - mmapper_size;
+
+        if(count < 0)
+                return -EINVAL;
+ 
+        copy_to_user(buf,&v_buf[*ppos],count);
+        
+        return count;
+}
+
+static ssize_t
+mmapper_write(struct file *file, const char *buf, size_t count, loff_t *ppos)
+{
+        if(*ppos > mmapper_size)
+                return -EINVAL;
+
+        if(count + *ppos > mmapper_size)
+                count = count + *ppos - mmapper_size;
+
+        if(count < 0)
+                return -EINVAL;
+
+        copy_from_user(&v_buf[*ppos],buf,count);
+        
+        return count;
+}
+
+static int 
+mmapper_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
+         unsigned long arg)
+{
+        return(-ENOIOCTLCMD);
+}
+
+static int 
+mmapper_mmap(struct file *file, struct vm_area_struct * vma)
+{
+        int ret = -EINVAL;
+        int size;
+
+        lock_kernel();
+        if (vma->vm_pgoff != 0)
+                goto out;
+        
+        size = vma->vm_end - vma->vm_start;
+        if(size > mmapper_size) return(-EFAULT);
+
+        /* XXX A comment above remap_pfn_range says it should only be
+         * called when the mm semaphore is held
+         */
+        if (remap_pfn_range(vma, vma->vm_start, p_buf >> PAGE_SHIFT, size,
+                             vma->vm_page_prot))
+                goto out;
+        ret = 0;
+out:
+        unlock_kernel();
+        return ret;
+}
+
+static int
+mmapper_open(struct inode *inode, struct file *file)
+{
+        return 0;
+}
+
+static int 
+mmapper_release(struct inode *inode, struct file *file)
+{
+        return 0;
+}
+
+static struct file_operations mmapper_fops = {
+        .owner          = THIS_MODULE,
+        .read           = mmapper_read,
+        .write          = mmapper_write,
+        .ioctl          = mmapper_ioctl,
+        .mmap           = mmapper_mmap,
+        .open           = mmapper_open,
+        .release        = mmapper_release,
+};
+
+static int __init mmapper_init(void)
+{
+        printk(KERN_INFO "Mapper v0.1\n");
+
+        v_buf = (char *) find_iomem("mmapper", &mmapper_size);
+        if(mmapper_size == 0){
+                printk(KERN_ERR "mmapper_init - find_iomem failed\n");
+                return(0);
+        }
+
+        p_buf = __pa(v_buf);
+
+        devfs_mk_cdev(MKDEV(30, 0), S_IFCHR|S_IRUGO|S_IWUGO, "mmapper");
+        return(0);
+}
+
+static void mmapper_exit(void)
+{
+}
+
+module_init(mmapper_init);
+module_exit(mmapper_exit);
+
+MODULE_AUTHOR("Greg Lonnon <glonnon@ridgerun.com>");
+MODULE_DESCRIPTION("DSPLinux simulator mmapper driver");
+/*
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */