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9f85f9e379
Void pointers have been used to access linker symbols, by declaring an extern pointer, then taking the address of it. This limits symbols values to aligned pointer values. To remove this restriction an IMPORT_SYM macro has been introduced, which declares it as a char pointer and casts it to the required type. Change-Id: I89877fc3b13ed311817bb8ba79d4872b89bfd3b0 Signed-off-by: Joel Hutton <Joel.Hutton@Arm.com>
133 lines
4.3 KiB
C
133 lines
4.3 KiB
C
/*
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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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