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 | * |
| 4 | * Redistribution and use in source and binary forms, with or without |
| 5 | * modification, are permitted provided that the following conditions are met: |
| 6 | * |
| 7 | * Redistributions of source code must retain the above copyright notice, this |
| 8 | * list of conditions and the following disclaimer. |
| 9 | * |
| 10 | * Redistributions in binary form must reproduce the above copyright notice, |
| 11 | * this list of conditions and the following disclaimer in the documentation |
| 12 | * and/or other materials provided with the distribution. |
| 13 | * |
| 14 | * Neither the name of ARM nor the names of its contributors may be used |
| 15 | * to endorse or promote products derived from this software without specific |
| 16 | * prior written permission. |
| 17 | * |
| 18 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| 19 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 20 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 21 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
| 22 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 23 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 24 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 25 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 26 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 27 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 28 | * POSSIBILITY OF SUCH DAMAGE. |
| 29 | */ |
| 30 | |
| 31 | #ifndef __CONTEXT_H__ |
| 32 | #define __CONTEXT_H__ |
| 33 | |
| 34 | /******************************************************************************* |
| 35 | * Constants that allow assembler code to access members of and the 'regs' |
| 36 | * structure at their correct offsets. |
| 37 | ******************************************************************************/ |
| 38 | #define CTX_REGS_OFFSET 0x0 |
| 39 | #define CTX_GPREG_R0 0x0 |
| 40 | #define CTX_GPREG_R1 0x4 |
| 41 | #define CTX_GPREG_R2 0x8 |
| 42 | #define CTX_GPREG_R3 0xC |
| 43 | #define CTX_LR 0x10 |
| 44 | #define CTX_SCR 0x14 |
| 45 | #define CTX_SPSR 0x18 |
| 46 | #define CTX_NS_SCTLR 0x1C |
| 47 | #define CTX_REGS_END 0x20 |
| 48 | |
| 49 | #ifndef __ASSEMBLY__ |
| 50 | |
| 51 | #include <cassert.h> |
| 52 | #include <stdint.h> |
| 53 | |
| 54 | /* |
| 55 | * Common constants to help define the 'cpu_context' structure and its |
| 56 | * members below. |
| 57 | */ |
| 58 | #define WORD_SHIFT 2 |
| 59 | #define DEFINE_REG_STRUCT(name, num_regs) \ |
| 60 | typedef struct name { \ |
| 61 | uint32_t _regs[num_regs]; \ |
| 62 | } __aligned(8) name##_t |
| 63 | |
| 64 | /* Constants to determine the size of individual context structures */ |
| 65 | #define CTX_REG_ALL (CTX_REGS_END >> WORD_SHIFT) |
| 66 | |
| 67 | DEFINE_REG_STRUCT(regs, CTX_REG_ALL); |
| 68 | |
| 69 | #undef CTX_REG_ALL |
| 70 | |
| 71 | #define read_ctx_reg(ctx, offset) ((ctx)->_regs[offset >> WORD_SHIFT]) |
| 72 | #define write_ctx_reg(ctx, offset, val) (((ctx)->_regs[offset >> WORD_SHIFT]) \ |
| 73 | = val) |
| 74 | typedef struct cpu_context { |
| 75 | regs_t regs_ctx; |
| 76 | } cpu_context_t; |
| 77 | |
| 78 | /* Macros to access members of the 'cpu_context_t' structure */ |
| 79 | #define get_regs_ctx(h) (&((cpu_context_t *) h)->regs_ctx) |
| 80 | |
| 81 | /* |
| 82 | * Compile time assertions related to the 'cpu_context' structure to |
| 83 | * ensure that the assembler and the compiler view of the offsets of |
| 84 | * the structure members is the same. |
| 85 | */ |
| 86 | CASSERT(CTX_REGS_OFFSET == __builtin_offsetof(cpu_context_t, regs_ctx), \ |
| 87 | assert_core_context_regs_offset_mismatch); |
| 88 | |
| 89 | #endif /* __ASSEMBLY__ */ |
| 90 | |
| 91 | #endif /* __CONTEXT_H__ */ |