GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

2026-09-06 03:52:57 +08:00
commit b1928b41c0
21813 changed files with 4413081 additions and 0 deletions
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+/*
+ * Copyright (c) 2021-2022, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+#include <stdbool.h>
+#include <stdint.h>
+
+#include <arch_features.h>
+#include <lib/smccc.h>
+#include <services/trng_svc.h>
+#include <smccc_helpers.h>
+
+#include <plat/common/plat_trng.h>
+
+#include "trng_entropy_pool.h"
+
+static const uuid_t uuid_null;
+
+/* handle the RND call in SMC 32 bit mode */
+static uintptr_t trng_rnd32(uint32_t nbits, void *handle)
+{
+	uint32_t mask = ~0U;
+	uint64_t ent[2] = {0};
+
+	if (nbits == 0U || nbits > TRNG_RND32_ENTROPY_MAXBITS) {
+		SMC_RET1(handle, TRNG_E_INVALID_PARAMS);
+	}
+
+	if (!trng_pack_entropy(nbits, &ent[0])) {
+		SMC_RET1(handle, TRNG_E_NO_ENTROPY);
+	}
+
+	if ((nbits % 32U) != 0U) {
+		mask >>= 32U - (nbits % 32U);
+	}
+
+	switch ((nbits - 1U) / 32U) {
+	case 0:
+		SMC_RET4(handle, TRNG_E_SUCCESS, 0, 0, ent[0] & mask);
+		break; /* unreachable */
+	case 1:
+		SMC_RET4(handle, TRNG_E_SUCCESS, 0, (ent[0] >> 32) & mask,
+			 ent[0] & 0xFFFFFFFF);
+		break; /* unreachable */
+	case 2:
+		SMC_RET4(handle, TRNG_E_SUCCESS, ent[1] & mask,
+			 (ent[0] >> 32) & 0xFFFFFFFF, ent[0] & 0xFFFFFFFF);
+		break; /* unreachable */
+	default:
+		SMC_RET1(handle, TRNG_E_INVALID_PARAMS);
+		break; /* unreachable */
+	}
+}
+
+/* handle the RND call in SMC 64 bit mode */
+static uintptr_t trng_rnd64(uint32_t nbits, void *handle)
+{
+	uint64_t mask = ~0ULL;
+	uint64_t ent[3] = {0};
+
+	if (nbits == 0U || nbits > TRNG_RND64_ENTROPY_MAXBITS) {
+		SMC_RET1(handle, TRNG_E_INVALID_PARAMS);
+	}
+
+	if (!trng_pack_entropy(nbits, &ent[0])) {
+		SMC_RET1(handle, TRNG_E_NO_ENTROPY);
+	}
+
+	/* Mask off higher bits if only part of register requested */
+	if ((nbits % 64U) != 0U) {
+		mask >>= 64U - (nbits % 64U);
+	}
+
+	switch ((nbits - 1U) / 64U) {
+	case 0:
+		SMC_RET4(handle, TRNG_E_SUCCESS, 0, 0, ent[0] & mask);
+		break; /* unreachable */
+	case 1:
+		SMC_RET4(handle, TRNG_E_SUCCESS, 0, ent[1] & mask, ent[0]);
+		break; /* unreachable */
+	case 2:
+		SMC_RET4(handle, TRNG_E_SUCCESS, ent[2] & mask, ent[1], ent[0]);
+		break; /* unreachable */
+	default:
+		SMC_RET1(handle, TRNG_E_INVALID_PARAMS);
+		break; /* unreachable */
+	}
+}
+
+void trng_setup(void)
+{
+	trng_entropy_pool_setup();
+	plat_entropy_setup();
+}
+
+/* Predicate indicating that a function id is part of TRNG */
+bool is_trng_fid(uint32_t smc_fid)
+{
+	return ((smc_fid == ARM_TRNG_VERSION) ||
+		(smc_fid == ARM_TRNG_FEATURES) ||
+		(smc_fid == ARM_TRNG_GET_UUID) ||
+		(smc_fid == ARM_TRNG_RND32) ||
+		(smc_fid == ARM_TRNG_RND64));
+}
+
+uintptr_t trng_smc_handler(uint32_t smc_fid, u_register_t x1, u_register_t x2,
+			   u_register_t x3, u_register_t x4, void *cookie,
+			   void *handle, u_register_t flags)
+{
+	if (!memcmp(&plat_trng_uuid, &uuid_null, sizeof(uuid_t))) {
+		SMC_RET1(handle, TRNG_E_NOT_IMPLEMENTED);
+	}
+
+	switch (smc_fid) {
+	case ARM_TRNG_VERSION:
+		SMC_RET1(handle, MAKE_SMCCC_VERSION(
+			TRNG_VERSION_MAJOR, TRNG_VERSION_MINOR));
+		break; /* unreachable */
+
+	case ARM_TRNG_FEATURES:
+		if (is_trng_fid((uint32_t)x1)) {
+			SMC_RET1(handle, TRNG_E_SUCCESS);
+		} else {
+			SMC_RET1(handle, TRNG_E_NOT_SUPPORTED);
+		}
+		break; /* unreachable */
+
+	case ARM_TRNG_GET_UUID:
+		SMC_UUID_RET(handle, plat_trng_uuid);
+		break; /* unreachable */
+
+	case ARM_TRNG_RND32:
+		return trng_rnd32((uint32_t)x1, handle);
+
+	case ARM_TRNG_RND64:
+		return trng_rnd64((uint32_t)x1, handle);
+
+	default:
+		WARN("Unimplemented TRNG Service Call: 0x%x\n", smc_fid);
+		SMC_RET1(handle, TRNG_E_NOT_IMPLEMENTED);
+		break; /* unreachable */
+	}
+}