From f552fa496c9e738afa069dd33578558fe4eb41ee Mon Sep 17 00:00:00 2001 From: Sughosh Ganu Date: Sun, 29 Dec 2019 00:01:05 +0530 Subject: efi: qemu: arm64: Add efi_rng_protocol implementation for the platform Add support for the EFI_RNG_PROTOCOL routines for the qemu arm64 platform. EFI_RNG_PROTOCOL is an uefi boottime service which is invoked by the efi stub in the kernel for getting random seed for kaslr. The routines are platform specific, and use the virtio-rng device on the platform to get random data. The feature can be enabled through the following config CONFIG_EFI_RNG_PROTOCOL Signed-off-by: Sughosh Ganu Changed SPDX header to use /* instead of //. Reviewed-by: Heinrich Schuchardt --- board/emulation/qemu-arm/qemu-arm.c | 42 +++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) (limited to 'board') diff --git a/board/emulation/qemu-arm/qemu-arm.c b/board/emulation/qemu-arm/qemu-arm.c index e1f4709c4cf..4e187330014 100644 --- a/board/emulation/qemu-arm/qemu-arm.c +++ b/board/emulation/qemu-arm/qemu-arm.c @@ -91,3 +91,45 @@ void *board_fdt_blob_setup(void) /* QEMU loads a generated DTB for us at the start of RAM. */ return (void *)CONFIG_SYS_SDRAM_BASE; } + +#if defined(CONFIG_EFI_RNG_PROTOCOL) +#include +#include + +#include + +efi_status_t platform_get_rng_device(struct udevice **dev) +{ + int ret; + efi_status_t status = EFI_DEVICE_ERROR; + struct udevice *bus, *devp; + + for (uclass_first_device(UCLASS_VIRTIO, &bus); bus; + uclass_next_device(&bus)) { + for (device_find_first_child(bus, &devp); devp; + device_find_next_child(&devp)) { + if (device_get_uclass_id(devp) == UCLASS_RNG) { + *dev = devp; + status = EFI_SUCCESS; + break; + } + } + } + + if (status != EFI_SUCCESS) { + debug("No rng device found\n"); + return EFI_DEVICE_ERROR; + } + + if (*dev) { + ret = device_probe(*dev); + if (ret) + return EFI_DEVICE_ERROR; + } else { + debug("Couldn't get child device\n"); + return EFI_DEVICE_ERROR; + } + + return EFI_SUCCESS; +} +#endif /* CONFIG_EFI_RNG_PROTOCOL */ -- cgit v1.3.1