efi/libstub: Describe RNG functions (ba832f68) · Commits · 戴 / test

drivers/firmware/efi/libstub/random.c

+24 −0

Original line number	Diff line number	Diff line
		@@ -25,6 +25,17 @@ union efi_rng_protocol {
		} mixed_mode;
		};

		/**
		* efi_get_random_bytes() - fill a buffer with random bytes
		* @size: size of the buffer
		* @out: caller allocated buffer to receive the random bytes
		*
		* The call will fail if either the firmware does not implement the
		* EFI_RNG_PROTOCOL or there are not enough random bytes available to fill
		* the buffer.
		*
		* Return: status code
		*/
		efi_status_t efi_get_random_bytes(unsigned long size, u8 *out)
		{
		efi_guid_t rng_proto = EFI_RNG_PROTOCOL_GUID;
		@@ -38,6 +49,19 @@ efi_status_t efi_get_random_bytes(unsigned long size, u8 *out)
		return efi_call_proto(rng, get_rng, NULL, size, out);
		}

		/**
		* efi_random_get_seed() - provide random seed as configuration table
		*
		* The EFI_RNG_PROTOCOL is used to read random bytes. These random bytes are
		* saved as a configuration table which can be used as entropy by the kernel
		* for the initialization of its pseudo random number generator.
		*
		* If the EFI_RNG_PROTOCOL is not available or there are not enough random bytes
		* available, the configuration table will not be installed and an error code
		* will be returned.
		*
		* Return: status code
		*/
		efi_status_t efi_random_get_seed(void)
		{
		efi_guid_t rng_proto = EFI_RNG_PROTOCOL_GUID;