diff --git a/plat/arm/board/juno/juno_decl.h b/plat/arm/board/juno/juno_decl.h new file mode 100644 index 000000000..75ed5b034 --- /dev/null +++ b/plat/arm/board/juno/juno_decl.h @@ -0,0 +1,36 @@ +/* + * Copyright (c) 2017, ARM Limited and Contributors. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * Redistributions of source code must retain the above copyright notice, this + * list of conditions and the following disclaimer. + * + * Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation + * and/or other materials provided with the distribution. + * + * Neither the name of ARM nor the names of its contributors may be used + * to endorse or promote products derived from this software without specific + * prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#ifndef __JUNO_DECL_H__ +#define __JUNO_DECL_H__ + +int juno_getentropy(void *buf, size_t len); + +#endif /* __JUNO_DECL_H__ */ diff --git a/plat/arm/board/juno/juno_def.h b/plat/arm/board/juno/juno_def.h index f27bbb22e..d7e2ac6b9 100644 --- a/plat/arm/board/juno/juno_def.h +++ b/plat/arm/board/juno/juno_def.h @@ -1,5 +1,5 @@ /* - * Copyright (c) 2014-2016, ARM Limited and Contributors. All rights reserved. + * Copyright (c) 2014-2017, ARM Limited and Contributors. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: @@ -74,6 +74,16 @@ #define TZC400_NSAID_SCP 11 #define TZC400_NSAID_CORESIGHT 12 +/******************************************************************************* + * TRNG related constants + ******************************************************************************/ +#define TRNG_BASE 0x7FE60000ULL +#define TRNG_NOUTPUTS 4 +#define TRNG_STATUS 0x10 +#define TRNG_INTMASK 0x14 +#define TRNG_CONFIG 0x18 +#define TRNG_CONTROL 0x1C + /******************************************************************************* * MMU-401 related constants ******************************************************************************/ diff --git a/plat/arm/board/juno/juno_trng.c b/plat/arm/board/juno/juno_trng.c new file mode 100644 index 000000000..2fcddcdb5 --- /dev/null +++ b/plat/arm/board/juno/juno_trng.c @@ -0,0 +1,104 @@ +/* + * Copyright (c) 2017, ARM Limited and Contributors. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * Redistributions of source code must retain the above copyright notice, this + * list of conditions and the following disclaimer. + * + * Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation + * and/or other materials provided with the distribution. + * + * Neither the name of ARM nor the names of its contributors may be used + * to endorse or promote products derived from this software without specific + * prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#include +#include +#include +#include +#include "juno_def.h" + +#define NSAMPLE_CLOCKS 1 /* min 1 cycle, max 231 cycles */ +#define NRETRIES 5 + +static inline int output_valid(void) +{ + int i; + + for (i = 0; i < NRETRIES; i++) { + uint32_t val; + + val = mmio_read_32(TRNG_BASE + TRNG_STATUS); + if (val & 1U) + break; + } + if (i >= NRETRIES) + return 0; /* No output data available. */ + return 1; +} + +/* + * This function fills `buf` with `len` bytes of entropy. + * It uses the Trusted Entropy Source peripheral on Juno. + * Returns 0 when the buffer has been filled with entropy + * successfully and -1 otherwise. + */ +int juno_getentropy(void *buf, size_t len) +{ + uint8_t *bp = buf; + + assert(buf); + assert(len); + assert(!check_uptr_overflow((uintptr_t)bp, len)); + + /* Disable interrupt mode. */ + mmio_write_32(TRNG_BASE + TRNG_INTMASK, 0); + /* Program TRNG to sample for `NSAMPLE_CLOCKS`. */ + mmio_write_32(TRNG_BASE + TRNG_CONFIG, NSAMPLE_CLOCKS); + + while (len > 0) { + int i; + + /* Start TRNG. */ + mmio_write_32(TRNG_BASE + TRNG_CONTROL, 1); + + /* Check if output is valid. */ + if (!output_valid()) + return -1; + + /* Fill entropy buffer. */ + for (i = 0; i < TRNG_NOUTPUTS; i++) { + size_t n; + uint32_t val; + + val = mmio_read_32(TRNG_BASE + i * sizeof(uint32_t)); + n = MIN(len, sizeof(uint32_t)); + memcpy(bp, &val, n); + bp += n; + len -= n; + if (len == 0) + break; + } + + /* Reset TRNG outputs. */ + mmio_write_32(TRNG_BASE + TRNG_STATUS, 1); + } + + return 0; +} diff --git a/plat/arm/board/juno/platform.mk b/plat/arm/board/juno/platform.mk index 7571582bc..924a40218 100644 --- a/plat/arm/board/juno/platform.mk +++ b/plat/arm/board/juno/platform.mk @@ -1,5 +1,5 @@ # -# Copyright (c) 2013-2016, ARM Limited and Contributors. All rights reserved. +# Copyright (c) 2013-2017, ARM Limited and Contributors. All rights reserved. # # Redistribution and use in source and binary forms, with or without # modification, are permitted provided that the following conditions are met: @@ -39,6 +39,7 @@ JUNO_INTERCONNECT_SOURCES := drivers/arm/cci/cci.c \ JUNO_SECURITY_SOURCES := drivers/arm/tzc/tzc400.c \ plat/arm/board/juno/juno_security.c \ + plat/arm/board/juno/juno_trng.c \ plat/arm/common/arm_tzc400.c