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/*
* Copyright (c) 2016-2020, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#ifndef CONTEXT_H
#define CONTEXT_H
#include <lib/utils_def.h>
/*******************************************************************************
* Constants that allow assembler code to access members of and the 'regs'
* structure at their correct offsets.
******************************************************************************/
#define CTX_REGS_OFFSET U(0x0)
#define CTX_GPREG_R0 U(0x0)
#define CTX_GPREG_R1 U(0x4)
#define CTX_GPREG_R2 U(0x8)
#define CTX_GPREG_R3 U(0xC)
#define CTX_LR U(0x10)
#define CTX_SCR U(0x14)
#define CTX_SPSR U(0x18)
#define CTX_NS_SCTLR U(0x1C)
#define CTX_REGS_END U(0x20)
#ifndef __ASSEMBLER__
#include <stdint.h>
#include <lib/cassert.h>
/*
* Common constants to help define the 'cpu_context' structure and its
* members below.
*/
#define WORD_SHIFT U(2)
#define DEFINE_REG_STRUCT(name, num_regs) \
typedef struct name { \
uint32_t ctx_regs[num_regs]; \
} __aligned(8) name##_t
/* Constants to determine the size of individual context structures */
#define CTX_REG_ALL (CTX_REGS_END >> WORD_SHIFT)
DEFINE_REG_STRUCT(regs, CTX_REG_ALL);
#undef CTX_REG_ALL
#define read_ctx_reg(ctx, offset) ((ctx)->ctx_regs[offset >> WORD_SHIFT])
#define write_ctx_reg(ctx, offset, val) (((ctx)->ctx_regs[offset >> WORD_SHIFT]) \
= val)
typedef struct cpu_context {
regs_t regs_ctx;
} cpu_context_t;
/* Macros to access members of the 'cpu_context_t' structure */
#define get_regs_ctx(h) (&((cpu_context_t *) h)->regs_ctx)
/*
* Compile time assertions related to the 'cpu_context' structure to
* ensure that the assembler and the compiler view of the offsets of
* the structure members is the same.
*/
CASSERT(CTX_REGS_OFFSET == __builtin_offsetof(cpu_context_t, regs_ctx), \
assert_core_context_regs_offset_mismatch);
#endif /* __ASSEMBLER__ */
#endif /* CONTEXT_H */
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