1 /* 2 * Copyright (c) 2016, ARM Limited and Contributors. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 7 #ifndef __CONTEXT_H__ 8 #define __CONTEXT_H__ 9 10 /******************************************************************************* 11 * Constants that allow assembler code to access members of and the 'regs' 12 * structure at their correct offsets. 13 ******************************************************************************/ 14 #define CTX_REGS_OFFSET 0x0 15 #define CTX_GPREG_R0 0x0 16 #define CTX_GPREG_R1 0x4 17 #define CTX_GPREG_R2 0x8 18 #define CTX_GPREG_R3 0xC 19 #define CTX_LR 0x10 20 #define CTX_SCR 0x14 21 #define CTX_SPSR 0x18 22 #define CTX_NS_SCTLR 0x1C 23 #define CTX_REGS_END 0x20 24 25 #ifndef __ASSEMBLY__ 26 27 #include <cassert.h> 28 #include <stdint.h> 29 30 /* 31 * Common constants to help define the 'cpu_context' structure and its 32 * members below. 33 */ 34 #define WORD_SHIFT 2 35 #define DEFINE_REG_STRUCT(name, num_regs) \ 36 typedef struct name { \ 37 uint32_t _regs[num_regs]; \ 38 } __aligned(8) name##_t 39 40 /* Constants to determine the size of individual context structures */ 41 #define CTX_REG_ALL (CTX_REGS_END >> WORD_SHIFT) 42 43 DEFINE_REG_STRUCT(regs, CTX_REG_ALL); 44 45 #undef CTX_REG_ALL 46 47 #define read_ctx_reg(ctx, offset) ((ctx)->_regs[offset >> WORD_SHIFT]) 48 #define write_ctx_reg(ctx, offset, val) (((ctx)->_regs[offset >> WORD_SHIFT]) \ 49 = val) 50 typedef struct cpu_context { 51 regs_t regs_ctx; 52 } cpu_context_t; 53 54 /* Macros to access members of the 'cpu_context_t' structure */ 55 #define get_regs_ctx(h) (&((cpu_context_t *) h)->regs_ctx) 56 57 /* 58 * Compile time assertions related to the 'cpu_context' structure to 59 * ensure that the assembler and the compiler view of the offsets of 60 * the structure members is the same. 61 */ 62 CASSERT(CTX_REGS_OFFSET == __builtin_offsetof(cpu_context_t, regs_ctx), \ 63 assert_core_context_regs_offset_mismatch); 64 65 #endif /* __ASSEMBLY__ */ 66 67 #endif /* __CONTEXT_H__ */ 68
