204 lines
8.5 KiB
C
204 lines
8.5 KiB
C
/*
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* Copyright (c) 2013-2014, ARM Limited and Contributors. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of ARM nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef __TSPD_PRIVATE_H__
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#define __TSPD_PRIVATE_H__
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#include <arch.h>
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#include <context.h>
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#include <interrupt_mgmt.h>
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#include <platform.h>
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#include <psci.h>
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/*******************************************************************************
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* Secure Payload PM state information e.g. SP is suspended, uninitialised etc
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* and macros to access the state information in the per-cpu 'state' flags
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******************************************************************************/
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#define TSP_PSTATE_OFF 0
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#define TSP_PSTATE_ON 1
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#define TSP_PSTATE_SUSPEND 2
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#define TSP_PSTATE_SHIFT 0
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#define TSP_PSTATE_MASK 0x3
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#define get_tsp_pstate(state) ((state >> TSP_PSTATE_SHIFT) & TSP_PSTATE_MASK)
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#define clr_tsp_pstate(state) (state &= ~(TSP_PSTATE_MASK \
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<< TSP_PSTATE_SHIFT))
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#define set_tsp_pstate(st, pst) do { \
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clr_tsp_pstate(st); \
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st |= (pst & TSP_PSTATE_MASK) << \
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TSP_PSTATE_SHIFT; \
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} while (0);
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/*
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* This flag is used by the TSPD to determine if the TSP is servicing a standard
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* SMC request prior to programming the next entry into the TSP e.g. if TSP
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* execution is preempted by a non-secure interrupt and handed control to the
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* normal world. If another request which is distinct from what the TSP was
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* previously doing arrives, then this flag will be help the TSPD to either
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* reject the new request or service it while ensuring that the previous context
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* is not corrupted.
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*/
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#define STD_SMC_ACTIVE_FLAG_SHIFT 2
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#define STD_SMC_ACTIVE_FLAG_MASK 1
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#define get_std_smc_active_flag(state) ((state >> STD_SMC_ACTIVE_FLAG_SHIFT) \
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& STD_SMC_ACTIVE_FLAG_MASK)
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#define set_std_smc_active_flag(state) (state |= \
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1 << STD_SMC_ACTIVE_FLAG_SHIFT)
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#define clr_std_smc_active_flag(state) (state &= \
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~(STD_SMC_ACTIVE_FLAG_MASK \
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<< STD_SMC_ACTIVE_FLAG_SHIFT))
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/*******************************************************************************
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* Secure Payload execution state information i.e. aarch32 or aarch64
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******************************************************************************/
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#define TSP_AARCH32 MODE_RW_32
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#define TSP_AARCH64 MODE_RW_64
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/*******************************************************************************
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* The SPD should know the type of Secure Payload.
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******************************************************************************/
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#define TSP_TYPE_UP PSCI_TOS_NOT_UP_MIG_CAP
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#define TSP_TYPE_UPM PSCI_TOS_UP_MIG_CAP
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#define TSP_TYPE_MP PSCI_TOS_NOT_PRESENT_MP
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/*******************************************************************************
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* Secure Payload migrate type information as known to the SPD. We assume that
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* the SPD is dealing with an MP Secure Payload.
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******************************************************************************/
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#define TSP_MIGRATE_INFO TSP_TYPE_MP
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/*******************************************************************************
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* Number of cpus that the present on this platform. TODO: Rely on a topology
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* tree to determine this in the future to avoid assumptions about mpidr
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* allocation
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******************************************************************************/
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#define TSPD_CORE_COUNT PLATFORM_CORE_COUNT
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/*******************************************************************************
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* Constants that allow assembler code to preserve callee-saved registers of the
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* C runtime context while performing a security state switch.
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******************************************************************************/
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#define TSPD_C_RT_CTX_X19 0x0
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#define TSPD_C_RT_CTX_X20 0x8
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#define TSPD_C_RT_CTX_X21 0x10
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#define TSPD_C_RT_CTX_X22 0x18
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#define TSPD_C_RT_CTX_X23 0x20
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#define TSPD_C_RT_CTX_X24 0x28
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#define TSPD_C_RT_CTX_X25 0x30
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#define TSPD_C_RT_CTX_X26 0x38
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#define TSPD_C_RT_CTX_X27 0x40
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#define TSPD_C_RT_CTX_X28 0x48
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#define TSPD_C_RT_CTX_X29 0x50
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#define TSPD_C_RT_CTX_X30 0x58
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#define TSPD_C_RT_CTX_SIZE 0x60
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#define TSPD_C_RT_CTX_ENTRIES (TSPD_C_RT_CTX_SIZE >> DWORD_SHIFT)
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#ifndef __ASSEMBLY__
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#include <cassert.h>
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#include <stdint.h>
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/*
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* The number of arguments to save during a SMC call for TSP.
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* Currently only x1 and x2 are used by TSP.
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*/
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#define TSP_NUM_ARGS 0x2
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/* AArch64 callee saved general purpose register context structure. */
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DEFINE_REG_STRUCT(c_rt_regs, TSPD_C_RT_CTX_ENTRIES);
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/*
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* Compile time assertion to ensure that both the compiler and linker
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* have the same double word aligned view of the size of the C runtime
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* register context.
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*/
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CASSERT(TSPD_C_RT_CTX_SIZE == sizeof(c_rt_regs_t), \
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assert_spd_c_rt_regs_size_mismatch);
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/*******************************************************************************
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* Structure which helps the SPD to maintain the per-cpu state of the SP.
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* 'saved_spsr_el3' - temporary copy to allow FIQ handling when the TSP has been
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* preempted.
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* 'saved_elr_el3' - temporary copy to allow FIQ handling when the TSP has been
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* preempted.
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* 'state' - collection of flags to track SP state e.g. on/off
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* 'mpidr' - mpidr to associate a context with a cpu
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* 'c_rt_ctx' - stack address to restore C runtime context from after
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* returning from a synchronous entry into the SP.
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* 'cpu_ctx' - space to maintain SP architectural state
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* 'saved_tsp_args' - space to store arguments for TSP arithmetic operations
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* which will queried using the TSP_GET_ARGS SMC by TSP.
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******************************************************************************/
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typedef struct tsp_context {
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uint64_t saved_elr_el3;
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uint32_t saved_spsr_el3;
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uint32_t state;
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uint64_t mpidr;
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uint64_t c_rt_ctx;
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cpu_context_t cpu_ctx;
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uint64_t saved_tsp_args[TSP_NUM_ARGS];
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} tsp_context_t;
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/* Helper macros to store and retrieve tsp args from tsp_context */
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#define store_tsp_args(tsp_ctx, x1, x2) do {\
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tsp_ctx->saved_tsp_args[0] = x1;\
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tsp_ctx->saved_tsp_args[1] = x2;\
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} while (0)
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#define get_tsp_args(tsp_ctx, x1, x2) do {\
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x1 = tsp_ctx->saved_tsp_args[0];\
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x2 = tsp_ctx->saved_tsp_args[1];\
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} while (0)
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/* TSPD power management handlers */
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extern const spd_pm_ops_t tspd_pm;
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/*******************************************************************************
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* Forward declarations
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******************************************************************************/
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struct tsp_vectors;
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/*******************************************************************************
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* Function & Data prototypes
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******************************************************************************/
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uint64_t tspd_enter_sp(uint64_t *c_rt_ctx);
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void __dead2 tspd_exit_sp(uint64_t c_rt_ctx, uint64_t ret);
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uint64_t tspd_synchronous_sp_entry(tsp_context_t *tsp_ctx);
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void __dead2 tspd_synchronous_sp_exit(tsp_context_t *tsp_ctx, uint64_t ret);
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int32_t tspd_init_secure_context(uint64_t entrypoint,
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uint32_t rw,
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uint64_t mpidr,
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tsp_context_t *tsp_ctx);
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extern tsp_context_t tspd_sp_context[TSPD_CORE_COUNT];
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extern struct tsp_vectors *tsp_vectors;
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#endif /*__ASSEMBLY__*/
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#endif /* __TSPD_PRIVATE_H__ */
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