Merge tag 'riscv/for-v5.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv...

[linux-2.6-block.git] / drivers / char / random.c

diff --git a/drivers/char/random.c b/drivers/char/random.c
index 5d5ea4ce144293e3e99cc7b7bcc68250cf12df5b..566922df4b7b551e6abdeda96b727b938696c0c9 100644 (file)
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -2445,3 +2445,17 @@ void add_hwgenerator_randomness(const char *buffer, size_t count,
        credit_entropy_bits(poolp, entropy);
 }
 EXPORT_SYMBOL_GPL(add_hwgenerator_randomness);
+
+/* Handle random seed passed by bootloader.
+ * If the seed is trustworthy, it would be regarded as hardware RNGs. Otherwise
+ * it would be regarded as device data.
+ * The decision is controlled by CONFIG_RANDOM_TRUST_BOOTLOADER.
+ */
+void add_bootloader_randomness(const void *buf, unsigned int size)
+{
+       if (IS_ENABLED(CONFIG_RANDOM_TRUST_BOOTLOADER))
+               add_hwgenerator_randomness(buf, size, size * 8);
+       else
+               add_device_randomness(buf, size);
+}
+EXPORT_SYMBOL_GPL(add_bootloader_randomness);
\ No newline at end of file