i386/linux/linux-2.3.21/drivers/sound/sound_firmware.c

   1 #include "os.h"
   2 #define __KERNEL_SYSCALLS__
   3 #include <linux/module.h>
   4 #include <linux/fs.h>
   5 #include <linux/mm.h>
   6 #include <linux/malloc.h>
   7 #include <linux/unistd.h>
   8 #include <asm/uaccess.h>
   9
  10 static int errno;
  11 static int do_mod_firmware_load(const char *fn, char **fp)
  12 {
  13         int fd;
  14         long l;
  15         char *dp;
  16
  17         fd = open(fn, 0, 0);
  18         if (fd == -1)
  19         {
  20                 printk(KERN_INFO "Unable to load '%s'.\n", fn);
  21                 return 0;
  22         }
  23         l = lseek(fd, 0L, 2);
  24         if (l <= 0 || l > 131072)
  25         {
  26                 printk(KERN_INFO "Invalid firmware '%s'\n", fn);
  27                 sys_close(fd);
  28                 return 0;
  29         }
  30         lseek(fd, 0L, 0);
  31         dp = vmalloc(l);
  32         if (dp == NULL)
  33         {
  34                 printk(KERN_INFO "Out of memory loading '%s'.\n", fn);
  35                 sys_close(fd);
  36                 return 0;
  37         }
  38         if (read(fd, dp, l) != l)
  39         {
  40                 printk(KERN_INFO "Failed to read '%s'.\n", fn);
  41                 vfree(dp);
  42                 sys_close(fd);
  43                 return 0;
  44         }
  45         close(fd);
  46         *fp = dp;
  47         return (int) l;
  48 }
  49
  50 int mod_firmware_load(const char *fn, char **fp)
  51 {
  52         int r;
  53         mm_segment_t fs = get_fs();
  54
  55         set_fs(get_ds());
  56         r = do_mod_firmware_load(fn, fp);
  57         set_fs(fs);
  58         return r;
  59 }
  60