diff options
| author | Sughosh Ganu <sughosh.ganu@linaro.org> | 2019-12-29 00:01:05 +0530 |
|---|---|---|
| committer | Heinrich Schuchardt <xypron.glpk@gmx.de> | 2020-01-07 18:08:22 +0100 |
| commit | f552fa496c9e738afa069dd33578558fe4eb41ee (patch) | |
| tree | afe8191c7038b544bee47a4076346631b1fd645e /board/emulation | |
| parent | 4f24ac08afccd5f51f0b4c7023fc8cf45efe8163 (diff) | |
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 <sughosh.ganu@linaro.org>
Changed SPDX header to use /* instead of //.
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Diffstat (limited to 'board/emulation')
| -rw-r--r-- | board/emulation/qemu-arm/qemu-arm.c | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/board/emulation/qemu-arm/qemu-arm.c b/board/emulation/qemu-arm/qemu-arm.c index e1f4709c4c..4e18733001 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 <efi_loader.h> +#include <efi_rng.h> + +#include <dm/device-internal.h> + +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 */ |