/*
* Copyright (c) 2013-2014, 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 __TSPD_PRIVATE_H__
#define __TSPD_PRIVATE_H__
#include <arch.h>
#include <context.h>
#include <interrupt_mgmt.h>
#include <platform.h>
#include <psci.h>
/*******************************************************************************
* Secure Payload PM state information e.g. SP is suspended, uninitialised etc
* and macros to access the state information in the per-cpu 'state' flags
******************************************************************************/
#define TSP_PSTATE_OFF 0
#define TSP_PSTATE_ON 1
#define TSP_PSTATE_SUSPEND 2
#define TSP_PSTATE_SHIFT 0
#define TSP_PSTATE_MASK 0x3
#define get_tsp_pstate(state) ((state >> TSP_PSTATE_SHIFT) & TSP_PSTATE_MASK)
#define clr_tsp_pstate(state) (state &= ~(TSP_PSTATE_MASK \
<< TSP_PSTATE_SHIFT))
#define set_tsp_pstate(st, pst) do { \
clr_tsp_pstate(st); \
st |= (pst & TSP_PSTATE_MASK) << \
TSP_PSTATE_SHIFT; \
} while (0);
/*
* This flag is used by the TSPD to determine if the TSP is servicing a standard
* SMC request prior to programming the next entry into the TSP e.g. if TSP
* execution is preempted by a non-secure interrupt and handed control to the
* normal world. If another request which is distinct from what the TSP was
* previously doing arrives, then this flag will be help the TSPD to either
* reject the new request or service it while ensuring that the previous context
* is not corrupted.
*/
#define STD_SMC_ACTIVE_FLAG_SHIFT 2
#define STD_SMC_ACTIVE_FLAG_MASK 1
#define get_std_smc_active_flag(state) ((state >> STD_SMC_ACTIVE_FLAG_SHIFT) \
& STD_SMC_ACTIVE_FLAG_MASK)
#define set_std_smc_active_flag(state) (state |= \
1 << STD_SMC_ACTIVE_FLAG_SHIFT)
#define clr_std_smc_active_flag(state) (state &= \
~(STD_SMC_ACTIVE_FLAG_MASK \
<< STD_SMC_ACTIVE_FLAG_SHIFT))
/*******************************************************************************
* Secure Payload execution state information i.e. aarch32 or aarch64
******************************************************************************/
#define TSP_AARCH32 MODE_RW_32
#define TSP_AARCH64 MODE_RW_64
/*******************************************************************************
* The SPD should know the type of Secure Payload.
******************************************************************************/
#define TSP_TYPE_UP PSCI_TOS_NOT_UP_MIG_CAP
#define TSP_TYPE_UPM PSCI_TOS_UP_MIG_CAP
#define TSP_TYPE_MP PSCI_TOS_NOT_PRESENT_MP
/*******************************************************************************
* Secure Payload migrate type information as known to the SPD. We assume that
* the SPD is dealing with an MP Secure Payload.
******************************************************************************/
#define TSP_MIGRATE_INFO TSP_TYPE_MP
/*******************************************************************************
* Number of cpus that the present on this platform. TODO: Rely on a topology
* tree to determine this in the future to avoid assumptions about mpidr
* allocation
******************************************************************************/
#define TSPD_CORE_COUNT PLATFORM_CORE_COUNT
/*******************************************************************************
* Constants that allow assembler code to preserve callee-saved registers of the
* C runtime context while performing a security state switch.
******************************************************************************/
#define TSPD_C_RT_CTX_X19 0x0
#define TSPD_C_RT_CTX_X20 0x8
#define TSPD_C_RT_CTX_X21 0x10
#define TSPD_C_RT_CTX_X22 0x18
#define TSPD_C_RT_CTX_X23 0x20
#define TSPD_C_RT_CTX_X24 0x28
#define TSPD_C_RT_CTX_X25 0x30
#define TSPD_C_RT_CTX_X26 0x38
#define TSPD_C_RT_CTX_X27 0x40
#define TSPD_C_RT_CTX_X28 0x48
#define TSPD_C_RT_CTX_X29 0x50
#define TSPD_C_RT_CTX_X30 0x58
#define TSPD_C_RT_CTX_SIZE 0x60
#define TSPD_C_RT_CTX_ENTRIES (TSPD_C_RT_CTX_SIZE >> DWORD_SHIFT)
#ifndef __ASSEMBLY__
#include <cassert.h>
#include <stdint.h>
/*
* The number of arguments to save during a SMC call for TSP.
* Currently only x1 and x2 are used by TSP.
*/
#define TSP_NUM_ARGS 0x2
/* AArch64 callee saved general purpose register context structure. */
DEFINE_REG_STRUCT(c_rt_regs, TSPD_C_RT_CTX_ENTRIES);
/*
* Compile time assertion to ensure that both the compiler and linker
* have the same double word aligned view of the size of the C runtime
* register context.
*/
CASSERT(TSPD_C_RT_CTX_SIZE == sizeof(c_rt_regs_t), \
assert_spd_c_rt_regs_size_mismatch);
/*******************************************************************************
* Structure which helps the SPD to maintain the per-cpu state of the SP.
* 'saved_spsr_el3' - temporary copy to allow FIQ handling when the TSP has been
* preempted.
* 'saved_elr_el3' - temporary copy to allow FIQ handling when the TSP has been
* preempted.
* 'state' - collection of flags to track SP state e.g. on/off
* 'mpidr' - mpidr to associate a context with a cpu
* 'c_rt_ctx' - stack address to restore C runtime context from after
* returning from a synchronous entry into the SP.
* 'cpu_ctx' - space to maintain SP architectural state
* 'saved_tsp_args' - space to store arguments for TSP arithmetic operations
* which will queried using the TSP_GET_ARGS SMC by TSP.
******************************************************************************/
typedef struct tsp_context {
uint64_t saved_elr_el3;
uint32_t saved_spsr_el3;
uint32_t state;
uint64_t mpidr;
uint64_t c_rt_ctx;
cpu_context_t cpu_ctx;
uint64_t saved_tsp_args[TSP_NUM_ARGS];
} tsp_context_t;
/* Helper macros to store and retrieve tsp args from tsp_context */
#define store_tsp_args(tsp_ctx, x1, x2) do {\
tsp_ctx->saved_tsp_args[0] = x1;\
tsp_ctx->saved_tsp_args[1] = x2;\
} while (0)
#define get_tsp_args(tsp_ctx, x1, x2) do {\
x1 = tsp_ctx->saved_tsp_args[0];\
x2 = tsp_ctx->saved_tsp_args[1];\
} while (0)
/* TSPD power management handlers */
extern const spd_pm_ops_t tspd_pm;
/*******************************************************************************
* Forward declarations
******************************************************************************/
struct entry_info;
/*******************************************************************************
* Function & Data prototypes
******************************************************************************/
extern uint64_t tspd_enter_sp(uint64_t *c_rt_ctx);
extern void __dead2 tspd_exit_sp(uint64_t c_rt_ctx, uint64_t ret);
extern uint64_t tspd_synchronous_sp_entry(tsp_context_t *tsp_ctx);
extern void __dead2 tspd_synchronous_sp_exit(tsp_context_t *tsp_ctx, uint64_t ret);
extern int32_t tspd_init_secure_context(uint64_t entrypoint,
uint32_t rw,
uint64_t mpidr,
tsp_context_t *tsp_ctx);
extern tsp_context_t tspd_sp_context[TSPD_CORE_COUNT];
extern struct entry_info *tsp_entry_info;
#endif /*__ASSEMBLY__*/
#endif /* __TSPD_PRIVATE_H__ */
