Soby Mathew | 748be1d | 2016-05-05 14:10:46 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2016, ARM Limited and Contributors. All rights reserved. |
| 3 | * |
dp-arm | fa3cf0b | 2017-05-03 09:38:09 +0100 | [diff] [blame^] | 4 | * SPDX-License-Identifier: BSD-3-Clause |
Soby Mathew | 748be1d | 2016-05-05 14:10:46 +0100 | [diff] [blame] | 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__ */ |