--- /dev/null
+/*
+ * 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__ */
/*
- * 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:
#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
******************************************************************************/
--- /dev/null
+/*
+ * 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 <assert.h>
+#include <mmio.h>
+#include <string.h>
+#include <utils.h>
+#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;
+}
#
-# 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:
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
projects / arm-tf.git / commitdiff