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132 lines
4.3 KiB
132 lines
4.3 KiB
/*
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* Copyright (c) 2013-2018, ARM Limited and Contributors. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#ifndef __RUNTIME_SVC_H__
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#define __RUNTIME_SVC_H__
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#include <bl_common.h> /* to include exception types */
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#include <smccc_helpers.h> /* to include SMCCC definitions */
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/*******************************************************************************
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* Structure definition, typedefs & constants for the runtime service framework
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******************************************************************************/
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/*
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* Constants to allow the assembler access a runtime service
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* descriptor
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*/
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#ifdef AARCH32
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#define RT_SVC_SIZE_LOG2 4
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#define RT_SVC_DESC_INIT 8
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#define RT_SVC_DESC_HANDLE 12
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#else
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#define RT_SVC_SIZE_LOG2 5
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#define RT_SVC_DESC_INIT 16
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#define RT_SVC_DESC_HANDLE 24
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#endif /* AARCH32 */
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#define SIZEOF_RT_SVC_DESC (1 << RT_SVC_SIZE_LOG2)
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/*
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* The function identifier has 6 bits for the owning entity number and
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* single bit for the type of smc call. When taken together these
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* values limit the maximum number of runtime services to 128.
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*/
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#define MAX_RT_SVCS 128
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#ifndef __ASSEMBLY__
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/* Prototype for runtime service initializing function */
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typedef int32_t (*rt_svc_init_t)(void);
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/*
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* Prototype for runtime service SMC handler function. x0 (SMC Function ID) to
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* x4 are as passed by the caller. Rest of the arguments to SMC and the context
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* can be accessed using the handle pointer. The cookie parameter is reserved
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* for future use
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*/
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typedef uintptr_t (*rt_svc_handle_t)(uint32_t smc_fid,
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u_register_t x1,
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u_register_t x2,
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u_register_t x3,
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u_register_t x4,
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void *cookie,
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void *handle,
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u_register_t flags);
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typedef struct rt_svc_desc {
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uint8_t start_oen;
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uint8_t end_oen;
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uint8_t call_type;
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const char *name;
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rt_svc_init_t init;
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rt_svc_handle_t handle;
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} rt_svc_desc_t;
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/*
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* Convenience macro to declare a service descriptor
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*/
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#define DECLARE_RT_SVC(_name, _start, _end, _type, _setup, _smch) \
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static const rt_svc_desc_t __svc_desc_ ## _name \
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__section("rt_svc_descs") __used = { \
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.start_oen = _start, \
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.end_oen = _end, \
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.call_type = _type, \
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.name = #_name, \
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.init = _setup, \
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.handle = _smch }
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/*
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* Compile time assertions related to the 'rt_svc_desc' structure to:
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* 1. ensure that the assembler and the compiler view of the size
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* of the structure are the same.
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* 2. ensure that the assembler and the compiler see the initialisation
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* routine at the same offset.
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* 3. ensure that the assembler and the compiler see the handler
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* routine at the same offset.
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*/
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CASSERT((sizeof(rt_svc_desc_t) == SIZEOF_RT_SVC_DESC), \
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assert_sizeof_rt_svc_desc_mismatch);
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CASSERT(RT_SVC_DESC_INIT == __builtin_offsetof(rt_svc_desc_t, init), \
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assert_rt_svc_desc_init_offset_mismatch);
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CASSERT(RT_SVC_DESC_HANDLE == __builtin_offsetof(rt_svc_desc_t, handle), \
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assert_rt_svc_desc_handle_offset_mismatch);
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/*
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* This macro combines the call type and the owning entity number corresponding
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* to a runtime service to generate a unique owning entity number. This unique
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* oen is used to access an entry in the 'rt_svc_descs_indices' array. The entry
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* contains the index of the service descriptor in the 'rt_svc_descs' array.
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*/
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#define get_unique_oen(oen, call_type) ((oen & FUNCID_OEN_MASK) | \
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((call_type & FUNCID_TYPE_MASK) \
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<< FUNCID_OEN_WIDTH))
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/*
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* This macro generates the unique owning entity number from the SMC Function
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* ID. This unique oen is used to access an entry in the
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* 'rt_svc_descs_indices' array to invoke the corresponding runtime service
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* handler during SMC handling.
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*/
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#define get_unique_oen_from_smc_fid(fid) \
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get_unique_oen(((fid) >> FUNCID_OEN_SHIFT), \
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((fid) >> FUNCID_TYPE_SHIFT))
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/*******************************************************************************
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* Function & variable prototypes
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******************************************************************************/
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void runtime_svc_init(void);
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uintptr_t handle_runtime_svc(uint32_t smc_fid, void *cookie, void *handle,
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unsigned int flags);
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IMPORT_SYM(uintptr_t, __RT_SVC_DESCS_START__, RT_SVC_DESCS_START);
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IMPORT_SYM(uintptr_t, __RT_SVC_DESCS_END__, RT_SVC_DESCS_END);
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void init_crash_reporting(void);
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extern uint8_t rt_svc_descs_indices[MAX_RT_SVCS];
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#endif /*__ASSEMBLY__*/
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#endif /* __RUNTIME_SVC_H__ */
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