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efi: qemu: arm64: Add efi_rng_protocol implementation for the platform

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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>
This commit is contained in:
Sughosh Ganu
2019-12-29 00:01:05 +05:30
committed by Heinrich Schuchardt
parent 4f24ac08af
commit f552fa496c
5 changed files with 195 additions and 0 deletions
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42
board/emulation/qemu-arm/qemu-arm.c
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@@ -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 */