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feat(tc): enable trng

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Enable the trng on the platform, which can be used by other features.
`rng-seed` has been removed and enabled `FEAT_RNG_TRAP` to trap to EL3
when accessing system registers RNDR and RNDRRS

Change-Id: Ibde39115f285e67d31b14863c75beaf37493deca
Signed-off-by: Leo Yan <leo.yan@arm.com>
Signed-off-by: Icen Zeyada <Icen.Zeyada2@arm.com>
This commit is contained in:
Leo Yan 2024-05-16 15:59:41 +01:00
parent a3f9617964
commit 2ae197acd6
3 changed files with 53 additions and 17 deletions
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15
fdts/tc-base.dtsi
View file

@ -46,21 +46,6 @@
serial0 = &os_uart;
};
chosen {
/*
* Add some dummy entropy for Linux so it
* doesn't delay the boot waiting for it.
*/
rng-seed = <0x01 0x02 0x04 0x05 0x06 0x07 0x08 \
0x01 0x02 0x04 0x05 0x06 0x07 0x08 \
0x01 0x02 0x04 0x05 0x06 0x07 0x08 \
0x01 0x02 0x04 0x05 0x06 0x07 0x08 \
0x01 0x02 0x04 0x05 0x06 0x07 0x08 \
0x01 0x02 0x04 0x05 0x06 0x07 0x08 \
0x01 0x02 0x04 0x05 0x06 0x07 0x08 \
0x01 0x02 0x04 0x05 0x06 0x07 0x08 >;
};
cpus {
#address-cells = <1>;
#size-cells = <0>;

14
plat/arm/board/tc/platform.mk
View file

@ -40,6 +40,12 @@ ENABLE_FEAT_MTE2 := 2
ENABLE_SPE_FOR_NS := 3
ENABLE_FEAT_TCR2 := 3
ifneq ($(filter ${TARGET_PLATFORM}, 3),)
ENABLE_FEAT_RNG_TRAP := 0
else
ENABLE_FEAT_RNG_TRAP := 1
endif
CTX_INCLUDE_AARCH32_REGS := 0
ifeq (${SPD},spmd)
@ -47,6 +53,8 @@ ifeq (${SPD},spmd)
CTX_INCLUDE_PAUTH_REGS := 1
endif
TRNG_SUPPORT := 1
# TC RESOLUTION - LIST OF VALID OPTIONS (this impacts only FVP)
TC_RESOLUTION_OPTIONS := 640x480p60 \
1920x1080p60
@ -285,8 +293,10 @@ ifeq (${MEASURED_BOOT},1)
endif
endif
ifeq (${TRNG_SUPPORT},1)
BL31_SOURCES += plat/arm/board/tc/tc_trng.c
BL31_SOURCES += plat/arm/board/tc/tc_trng.c
ifneq (${ENABLE_FEAT_RNG_TRAP},0)
BL31_SOURCES += plat/arm/board/tc/tc_rng_trap.c
endif
ifneq (${PLATFORM_TEST},)

41
plat/arm/board/tc/tc_rng_trap.c Normal file
View file

@ -0,0 +1,41 @@
/*
* Copyright (c) 2025, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <assert.h>
#include <bl31/sync_handle.h>
#include <context.h>
#include <plat/common/plat_trng.h>
#define XZR_REG_NUM 31
int plat_handle_rng_trap(uint64_t esr_el3, cpu_context_t *ctx)
{
uint64_t entropy;
/* extract the target register number from the exception syndrome */
unsigned int rt = get_sysreg_iss_rt(esr_el3);
/* ignore XZR accesses and writes to the register */
assert(rt != XZR_REG_NUM && !is_sysreg_iss_write(esr_el3));
if (!plat_get_entropy(&entropy)) {
ERROR("Failed to get entropy\n");
panic();
}
/* Emulate RNDR and RNDRRS */
gp_regs_t *gpregs = get_gpregs_ctx(ctx);
write_ctx_reg(gpregs, rt, entropy);
/*
* We successfully handled the trap, continue with the next
* instruction.
*/
return TRAP_RET_CONTINUE;
}