target/linux/generic/patches-3.0/941-ocf_20110720.patch

   1 --- a/drivers/char/random.c
   2 +++ b/drivers/char/random.c
   3 @@ -130,6 +130,9 @@
   4   *     void add_interrupt_randomness(int irq);
   5   *     void add_disk_randomness(struct gendisk *disk);
   6   *
   7 + *      void random_input_words(__u32 *buf, size_t wordcount, int ent_count)
   8 + *      int random_input_wait(void);
   9 + *
  10   * add_input_randomness() uses the input layer interrupt timing, as well as
  11   * the event type information from the hardware.
  12   *
  13 @@ -147,6 +150,13 @@
  14   * seek times do not make for good sources of entropy, as their seek
  15   * times are usually fairly consistent.
  16   *
  17 + * random_input_words() just provides a raw block of entropy to the input
  18 + * pool, such as from a hardware entropy generator.
  19 + *
  20 + * random_input_wait() suspends the caller until such time as the
  21 + * entropy pool falls below the write threshold, and returns a count of how
  22 + * much entropy (in bits) is needed to sustain the pool.
  23 + *
  24   * All of these routines try to estimate how many bits of randomness a
  25   * particular randomness source.  They do this by keeping track of the
  26   * first and second order deltas of the event timings.
  27 @@ -722,6 +732,63 @@ void add_disk_randomness(struct gendisk
  28  }
  29  #endif
  30
  31 +/*
  32 + * random_input_words - add bulk entropy to pool
  33 + *
  34 + * @buf: buffer to add
  35 + * @wordcount: number of __u32 words to add
  36 + * @ent_count: total amount of entropy (in bits) to credit
  37 + *
  38 + * this provides bulk input of entropy to the input pool
  39 + *
  40 + */
  41 +void random_input_words(__u32 *buf, size_t wordcount, int ent_count)
  42 +{
  43 +       mix_pool_bytes(&input_pool, buf, wordcount*4);
  44 +
  45 +       credit_entropy_bits(&input_pool, ent_count);
  46 +
  47 +       DEBUG_ENT("crediting %d bits => %d\n",
  48 +                 ent_count, input_pool.entropy_count);
  49 +       /*
  50 +        * Wake up waiting processes if we have enough
  51 +        * entropy.
  52 +        */
  53 +       if (input_pool.entropy_count >= random_read_wakeup_thresh)
  54 +               wake_up_interruptible(&random_read_wait);
  55 +}
  56 +EXPORT_SYMBOL(random_input_words);
  57 +
  58 +/*
  59 + * random_input_wait - wait until random needs entropy
  60 + *
  61 + * this function sleeps until the /dev/random subsystem actually
  62 + * needs more entropy, and then return the amount of entropy
  63 + * that it would be nice to have added to the system.
  64 + */
  65 +int random_input_wait(void)
  66 +{
  67 +       int count;
  68 +
  69 +       wait_event_interruptible(random_write_wait,
  70 +                        input_pool.entropy_count < random_write_wakeup_thresh);
  71 +
  72 +       count = random_write_wakeup_thresh - input_pool.entropy_count;
  73 +
  74 +        /* likely we got woken up due to a signal */
  75 +       if (count <= 0) count = random_read_wakeup_thresh;
  76 +
  77 +       DEBUG_ENT("requesting %d bits from input_wait()er %d<%d\n",
  78 +                 count,
  79 +                 input_pool.entropy_count, random_write_wakeup_thresh);
  80 +
  81 +       return count;
  82 +}
  83 +EXPORT_SYMBOL(random_input_wait);
  84 +
  85 +
  86 +#define EXTRACT_SIZE 10
  87 +
  88  /*********************************************************************
  89   *
  90   * Entropy extraction routines
  91 --- a/fs/fcntl.c
  92 +++ b/fs/fcntl.c
  93 @@ -142,6 +142,7 @@ SYSCALL_DEFINE1(dup, unsigned int, filde
  94         }
  95         return ret;
  96  }
  97 +EXPORT_SYMBOL(sys_dup);
  98
  99  #define SETFL_MASK (O_APPEND | O_NONBLOCK | O_NDELAY | O_DIRECT | O_NOATIME)
 100
 101 --- a/include/linux/miscdevice.h
 102 +++ b/include/linux/miscdevice.h
 103 @@ -18,6 +18,7 @@
 104  #define APOLLO_MOUSE_MINOR     7
 105  #define PC110PAD_MINOR         9
 106  /*#define ADB_MOUSE_MINOR      10      FIXME OBSOLETE */
 107 +#define CRYPTODEV_MINOR                70      /* /dev/crypto */
 108  #define WATCHDOG_MINOR         130     /* Watchdog timer     */
 109  #define TEMP_MINOR             131     /* Temperature Sensor */
 110  #define RTC_MINOR              135
 111 --- a/include/linux/random.h
 112 +++ b/include/linux/random.h
 113 @@ -54,6 +54,10 @@ extern void add_input_randomness(unsigne
 114                                  unsigned int value);
 115  extern void add_interrupt_randomness(int irq);
 116
 117 +extern void random_input_words(__u32 *buf, size_t wordcount, int ent_count);
 118 +extern int random_input_wait(void);
 119 +#define HAS_RANDOM_INPUT_WAIT 1
 120 +
 121  extern void get_random_bytes(void *buf, int nbytes);
 122  void generate_random_uuid(unsigned char uuid_out[16]);
 123