diff options
Diffstat (limited to 'services/std_svc/rmmd/trp/trp_main.c')
| -rw-r--r-- | services/std_svc/rmmd/trp/trp_main.c | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/services/std_svc/rmmd/trp/trp_main.c b/services/std_svc/rmmd/trp/trp_main.c new file mode 100644 index 000000000..2ab9eccfd --- /dev/null +++ b/services/std_svc/rmmd/trp/trp_main.c @@ -0,0 +1,136 @@ +/* + * Copyright (c) 2021, Arm Limited and Contributors. All rights reserved. + * + * SPDX-License-Identifier: BSD-3-Clause + */ + + +#include <common/debug.h> +#include <plat/common/platform.h> +#include <services/gtsi_svc.h> +#include <services/rmi_svc.h> +#include <services/trp/platform_trp.h> + +#include <platform_def.h> +#include "trp_private.h" + +/******************************************************************************* + * Per cpu data structure to populate parameters for an SMC in C code and use + * a pointer to this structure in assembler code to populate x0-x7 + ******************************************************************************/ +static trp_args_t trp_smc_args[PLATFORM_CORE_COUNT]; + +/******************************************************************************* + * Set the arguments for SMC call + ******************************************************************************/ +static trp_args_t *set_smc_args(uint64_t arg0, + uint64_t arg1, + uint64_t arg2, + uint64_t arg3, + uint64_t arg4, + uint64_t arg5, + uint64_t arg6, + uint64_t arg7) +{ + uint32_t linear_id; + trp_args_t *pcpu_smc_args; + + /* + * Return to Secure Monitor by raising an SMC. The results of the + * service are passed as an arguments to the SMC + */ + linear_id = plat_my_core_pos(); + pcpu_smc_args = &trp_smc_args[linear_id]; + write_trp_arg(pcpu_smc_args, TRP_ARG0, arg0); + write_trp_arg(pcpu_smc_args, TRP_ARG1, arg1); + write_trp_arg(pcpu_smc_args, TRP_ARG2, arg2); + write_trp_arg(pcpu_smc_args, TRP_ARG3, arg3); + write_trp_arg(pcpu_smc_args, TRP_ARG4, arg4); + write_trp_arg(pcpu_smc_args, TRP_ARG5, arg5); + write_trp_arg(pcpu_smc_args, TRP_ARG6, arg6); + write_trp_arg(pcpu_smc_args, TRP_ARG7, arg7); + + return pcpu_smc_args; +} + +/******************************************************************************* + * Setup function for TRP. + ******************************************************************************/ +void trp_setup(void) +{ + /* Perform early platform-specific setup */ + trp_early_platform_setup(); +} + +/* Main function for TRP */ +void trp_main(void) +{ + NOTICE("TRP: %s\n", version_string); + NOTICE("TRP: %s\n", build_message); + INFO("TRP: Memory base : 0x%lx\n", (unsigned long)RMM_BASE); + INFO("TRP: Total size : 0x%lx bytes\n", (unsigned long)(RMM_END + - RMM_BASE)); +} + +/******************************************************************************* + * Returning RMI version back to Normal World + ******************************************************************************/ +static trp_args_t *trp_ret_rmi_version(void) +{ + VERBOSE("RMM version is %u.%u\n", RMI_ABI_VERSION_MAJOR, + RMI_ABI_VERSION_MINOR); + return set_smc_args(RMI_RMM_REQ_COMPLETE, RMI_ABI_VERSION, + 0, 0, 0, 0, 0, 0); +} + +/******************************************************************************* + * Transitioning granule of NON-SECURE type to REALM type + ******************************************************************************/ +static trp_args_t *trp_asc_mark_realm(unsigned long long x1) +{ + unsigned long long ret; + + VERBOSE("Delegating granule 0x%llx\n", x1); + ret = trp_smc(set_smc_args(SMC_ASC_MARK_REALM, x1, 0, 0, 0, 0, 0, 0)); + + if (ret != 0ULL) { + ERROR("Granule transition from NON-SECURE type to REALM type " + "failed 0x%llx\n", ret); + } + return set_smc_args(RMI_RMM_REQ_COMPLETE, ret, 0, 0, 0, 0, 0, 0); +} + +/******************************************************************************* + * Transitioning granule of REALM type to NON-SECURE type + ******************************************************************************/ +static trp_args_t *trp_asc_mark_nonsecure(unsigned long long x1) +{ + unsigned long long ret; + + VERBOSE("Undelegating granule 0x%llx\n", x1); + ret = trp_smc(set_smc_args(SMC_ASC_MARK_NONSECURE, x1, 0, 0, 0, 0, 0, 0)); + + if (ret != 0ULL) { + ERROR("Granule transition from REALM type to NON-SECURE type " + "failed 0x%llx\n", ret); + } + return set_smc_args(RMI_RMM_REQ_COMPLETE, ret, 0, 0, 0, 0, 0, 0); +} + +/******************************************************************************* + * Main RMI SMC handler function + ******************************************************************************/ +trp_args_t *trp_rmi_handler(unsigned long fid, unsigned long long x1) +{ + switch (fid) { + case RMI_RMM_REQ_VERSION: + return trp_ret_rmi_version(); + case RMI_RMM_GRANULE_DELEGATE: + return trp_asc_mark_realm(x1); + case RMI_RMM_GRANULE_UNDELEGATE: + return trp_asc_mark_nonsecure(x1); + default: + ERROR("Invalid SMC code to %s, FID %lu\n", __func__, fid); + } + return set_smc_args(SMC_UNK, 0, 0, 0, 0, 0, 0, 0); +} |