The patch series adds support for the EFI_RNG_PROTOCOL routines for qemu arm64 platform. The getrng routine, used to get the random bytes, uses the virtio-rng device found on the platform. The protocol, once installed, can be used by the efi stub in the kernel for getting random bytes needed for the kaslr feature.
These patches apply on top of the patch series to add random number generator driver uclass[1]
[1] - https://lists.denx.de/pipermail/u-boot/2019-December/394804.html
Changes since V3: * Handle review comments from Heinrich Schuchardt related to calling EFI_EXIT at the end of the efi_rng_protocol routines using a goto label. * Add a weak function platform_get_rng_device based on review comment from Heinrich Schuchardt.
Changes since V2: * Based on review comments from Heinrich Schuchardt, the rng drivers read all the bytes requested in the individual drivers. Corresponding changes made in getrng routine to remove the loop to read the bytes requested, since that would be handled in the drivers.
Changes since V1: * Handle review comments from Heinrich Schuchardt. * Change the logic in the getrng routine to implement a loop to read the number of bytes requested. This change is needed to handle the change in the rng uclass's read function, which now returns the number of bytes read, which might be less than the number of bytes requested.
Sughosh Ganu (3): efi_loader: Add guidcpy function efi: qemu: arm64: Add efi_rng_protocol implementation for the platform efi_rng_protocol: Install the efi_rng_protocol on the root node
board/emulation/qemu-arm/qemu-arm.c | 42 ++++++++++++++ include/efi_loader.h | 9 +++ include/efi_rng.h | 32 ++++++++++ lib/efi_loader/Kconfig | 8 +++ lib/efi_loader/Makefile | 1 + lib/efi_loader/efi_boottime.c | 4 +- lib/efi_loader/efi_rng.c | 113 ++++++++++++++++++++++++++++++++++++ lib/efi_loader/efi_root_node.c | 4 ++ 8 files changed, 211 insertions(+), 2 deletions(-) create mode 100644 include/efi_rng.h create mode 100644 lib/efi_loader/efi_rng.c