drivers/sgi/char/rrm.c

   1 /*
   2  * Linux Rendering Resource Manager
   3  *
   4  *          Implements the SGI-compatible rendering resource manager.
   5  *          This takes care of implementing the virtualized video hardware
   6  *          access required for OpenGL direct rendering.
   7  *
   8  * Author:  Miguel de Icaza (miguel@nuclecu.unam.mx)
   9  *
  10  * Fixes:
  11  */
  12 #include <asm/uaccess.h>
  13 #include <asm/rrm.h>
  14
  15 #ifdef MODULE
  16 #include <linux/module.h>
  17 #endif
  18
  19 int
  20 rrm_open_rn (int rnid, void *arg)
  21 {
  22         return 0;
  23 }
  24
  25 int
  26 rrm_close_rn (int rnid, void *arg)
  27 {
  28         return 0;
  29 }
  30
  31 int
  32 rrm_bind_proc_to_rn (int rnid, void *arg)
  33 {
  34         return 0;
  35 }
  36
  37 typedef int (*rrm_function )(void *arg);
  38
  39 struct {
  40         int (*r_fn)(int rnid, void *arg);
  41         int arg_size;
  42 } rrm_functions [] = {
  43         { rrm_open_rn,         sizeof (struct RRM_OpenRN) },
  44         { rrm_close_rn,        sizeof (struct RRM_CloseRN) },
  45         { rrm_bind_proc_to_rn, sizeof (struct RRM_BindProcToRN) }
  46 };
  47
  48 #define RRM_FUNCTIONS (sizeof (rrm_functions)/sizeof (rrm_functions [0]))
  49
  50 /* cmd is a number in the range [0..RRM_CMD_LIMIT-RRM_BASE] */
  51 int
  52 rrm_command (unsigned int cmd, void *arg)
  53 {
  54         int i, rnid;
  55
  56         if (cmd > RRM_FUNCTIONS){
  57                 printk ("Called unimplemented rrm ioctl: %d\n", cmd + RRM_BASE);
  58                 return -EINVAL;
  59         }
  60         i = verify_area (VERIFY_READ, arg, rrm_functions [cmd].arg_size);
  61         if (i) return i;
  62
  63         if (__get_user (rnid, (int *) arg))
  64                 return -EFAULT;
  65         return (*(rrm_functions [cmd].r_fn))(rnid, arg);
  66 }
  67
  68 int
  69 rrm_close (struct inode *inode, struct file *file)
  70 {
  71         /* This routine is invoked when the device is closed */
  72         return 0;
  73 }