Catalin Marinas | b3901d5 | 2012-03-05 11:49:28 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Based on arch/arm/include/asm/thread_info.h |
| 3 | * |
| 4 | * Copyright (C) 2002 Russell King. |
| 5 | * Copyright (C) 2012 ARM Ltd. |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License version 2 as |
| 9 | * published by the Free Software Foundation. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 18 | */ |
| 19 | #ifndef __ASM_THREAD_INFO_H |
| 20 | #define __ASM_THREAD_INFO_H |
| 21 | |
| 22 | #ifdef __KERNEL__ |
| 23 | |
| 24 | #include <linux/compiler.h> |
| 25 | |
Suzuki K. Poulose | 755e70b | 2015-10-19 14:19:32 +0100 | [diff] [blame] | 26 | #ifdef CONFIG_ARM64_4K_PAGES |
Feng Kan | 845ad05 | 2013-07-23 18:52:31 +0100 | [diff] [blame] | 27 | #define THREAD_SIZE_ORDER 2 |
Suzuki K. Poulose | 44eaacf | 2015-10-19 14:19:37 +0100 | [diff] [blame] | 28 | #elif defined(CONFIG_ARM64_16K_PAGES) |
| 29 | #define THREAD_SIZE_ORDER 0 |
Catalin Marinas | b3901d5 | 2012-03-05 11:49:28 +0000 | [diff] [blame] | 30 | #endif |
| 31 | |
Feng Kan | 845ad05 | 2013-07-23 18:52:31 +0100 | [diff] [blame] | 32 | #define THREAD_SIZE 16384 |
Catalin Marinas | b3901d5 | 2012-03-05 11:49:28 +0000 | [diff] [blame] | 33 | #define THREAD_START_SP (THREAD_SIZE - 16) |
| 34 | |
| 35 | #ifndef __ASSEMBLY__ |
| 36 | |
| 37 | struct task_struct; |
Catalin Marinas | b3901d5 | 2012-03-05 11:49:28 +0000 | [diff] [blame] | 38 | |
| 39 | #include <asm/types.h> |
| 40 | |
| 41 | typedef unsigned long mm_segment_t; |
| 42 | |
| 43 | /* |
| 44 | * low level task data that entry.S needs immediate access to. |
| 45 | * __switch_to() assumes cpu_context follows immediately after cpu_domain. |
| 46 | */ |
| 47 | struct thread_info { |
| 48 | unsigned long flags; /* low level flags */ |
| 49 | mm_segment_t addr_limit; /* address limit */ |
| 50 | struct task_struct *task; /* main task structure */ |
Catalin Marinas | b3901d5 | 2012-03-05 11:49:28 +0000 | [diff] [blame] | 51 | int preempt_count; /* 0 => preemptable, <0 => bug */ |
| 52 | int cpu; /* cpu */ |
| 53 | }; |
| 54 | |
| 55 | #define INIT_THREAD_INFO(tsk) \ |
| 56 | { \ |
| 57 | .task = &tsk, \ |
Catalin Marinas | b3901d5 | 2012-03-05 11:49:28 +0000 | [diff] [blame] | 58 | .flags = 0, \ |
| 59 | .preempt_count = INIT_PREEMPT_COUNT, \ |
| 60 | .addr_limit = KERNEL_DS, \ |
Catalin Marinas | b3901d5 | 2012-03-05 11:49:28 +0000 | [diff] [blame] | 61 | } |
| 62 | |
| 63 | #define init_thread_info (init_thread_union.thread_info) |
| 64 | #define init_stack (init_thread_union.stack) |
| 65 | |
| 66 | /* |
Behan Webster | 3337a10 | 2014-08-27 05:29:29 +0100 | [diff] [blame] | 67 | * how to get the current stack pointer from C |
| 68 | */ |
| 69 | register unsigned long current_stack_pointer asm ("sp"); |
| 70 | |
| 71 | /* |
Catalin Marinas | b3901d5 | 2012-03-05 11:49:28 +0000 | [diff] [blame] | 72 | * how to get the thread information struct from C |
| 73 | */ |
| 74 | static inline struct thread_info *current_thread_info(void) __attribute_const__; |
| 75 | |
Jungseok Lee | 6cdf9c7 | 2015-12-04 11:02:25 +0000 | [diff] [blame] | 76 | /* |
| 77 | * struct thread_info can be accessed directly via sp_el0. |
Mark Rutland | adf7589 | 2016-09-08 13:55:38 +0100 | [diff] [blame] | 78 | * |
| 79 | * We don't use read_sysreg() as we want the compiler to cache the value where |
| 80 | * possible. |
Jungseok Lee | 6cdf9c7 | 2015-12-04 11:02:25 +0000 | [diff] [blame] | 81 | */ |
Catalin Marinas | b3901d5 | 2012-03-05 11:49:28 +0000 | [diff] [blame] | 82 | static inline struct thread_info *current_thread_info(void) |
| 83 | { |
Jungseok Lee | 6cdf9c7 | 2015-12-04 11:02:25 +0000 | [diff] [blame] | 84 | unsigned long sp_el0; |
| 85 | |
| 86 | asm ("mrs %0, sp_el0" : "=r" (sp_el0)); |
| 87 | |
| 88 | return (struct thread_info *)sp_el0; |
Catalin Marinas | b3901d5 | 2012-03-05 11:49:28 +0000 | [diff] [blame] | 89 | } |
| 90 | |
| 91 | #define thread_saved_pc(tsk) \ |
| 92 | ((unsigned long)(tsk->thread.cpu_context.pc)) |
| 93 | #define thread_saved_sp(tsk) \ |
| 94 | ((unsigned long)(tsk->thread.cpu_context.sp)) |
| 95 | #define thread_saved_fp(tsk) \ |
| 96 | ((unsigned long)(tsk->thread.cpu_context.fp)) |
| 97 | |
| 98 | #endif |
| 99 | |
| 100 | /* |
Catalin Marinas | b3901d5 | 2012-03-05 11:49:28 +0000 | [diff] [blame] | 101 | * thread information flags: |
| 102 | * TIF_SYSCALL_TRACE - syscall trace active |
AKASHI Takahiro | 449f81a | 2014-04-30 10:51:29 +0100 | [diff] [blame] | 103 | * TIF_SYSCALL_TRACEPOINT - syscall tracepoint for ftrace |
| 104 | * TIF_SYSCALL_AUDIT - syscall auditing |
| 105 | * TIF_SECOMP - syscall secure computing |
Catalin Marinas | b3901d5 | 2012-03-05 11:49:28 +0000 | [diff] [blame] | 106 | * TIF_SIGPENDING - signal pending |
| 107 | * TIF_NEED_RESCHED - rescheduling necessary |
| 108 | * TIF_NOTIFY_RESUME - callback before returning to user |
| 109 | * TIF_USEDFPU - FPU was used by this task this quantum (SMP) |
Catalin Marinas | b3901d5 | 2012-03-05 11:49:28 +0000 | [diff] [blame] | 110 | */ |
| 111 | #define TIF_SIGPENDING 0 |
| 112 | #define TIF_NEED_RESCHED 1 |
| 113 | #define TIF_NOTIFY_RESUME 2 /* callback before returning to user */ |
Ard Biesheuvel | 005f78c | 2014-05-08 11:20:23 +0200 | [diff] [blame] | 114 | #define TIF_FOREIGN_FPSTATE 3 /* CPU's FP state is not current's */ |
Larry Bassel | 6c81fe7 | 2014-05-30 12:34:15 -0700 | [diff] [blame] | 115 | #define TIF_NOHZ 7 |
Catalin Marinas | b3901d5 | 2012-03-05 11:49:28 +0000 | [diff] [blame] | 116 | #define TIF_SYSCALL_TRACE 8 |
AKASHI Takahiro | 449f81a | 2014-04-30 10:51:29 +0100 | [diff] [blame] | 117 | #define TIF_SYSCALL_AUDIT 9 |
| 118 | #define TIF_SYSCALL_TRACEPOINT 10 |
| 119 | #define TIF_SECCOMP 11 |
Catalin Marinas | b3901d5 | 2012-03-05 11:49:28 +0000 | [diff] [blame] | 120 | #define TIF_MEMDIE 18 /* is terminating due to OOM killer */ |
| 121 | #define TIF_FREEZE 19 |
| 122 | #define TIF_RESTORE_SIGMASK 20 |
| 123 | #define TIF_SINGLESTEP 21 |
| 124 | #define TIF_32BIT 22 /* 32bit process */ |
Catalin Marinas | b3901d5 | 2012-03-05 11:49:28 +0000 | [diff] [blame] | 125 | |
| 126 | #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) |
| 127 | #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) |
| 128 | #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) |
Ard Biesheuvel | 005f78c | 2014-05-08 11:20:23 +0200 | [diff] [blame] | 129 | #define _TIF_FOREIGN_FPSTATE (1 << TIF_FOREIGN_FPSTATE) |
Larry Bassel | 6c81fe7 | 2014-05-30 12:34:15 -0700 | [diff] [blame] | 130 | #define _TIF_NOHZ (1 << TIF_NOHZ) |
AKASHI Takahiro | 449f81a | 2014-04-30 10:51:29 +0100 | [diff] [blame] | 131 | #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) |
| 132 | #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) |
| 133 | #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT) |
| 134 | #define _TIF_SECCOMP (1 << TIF_SECCOMP) |
Catalin Marinas | b3901d5 | 2012-03-05 11:49:28 +0000 | [diff] [blame] | 135 | #define _TIF_32BIT (1 << TIF_32BIT) |
| 136 | |
| 137 | #define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \ |
Ard Biesheuvel | 005f78c | 2014-05-08 11:20:23 +0200 | [diff] [blame] | 138 | _TIF_NOTIFY_RESUME | _TIF_FOREIGN_FPSTATE) |
Catalin Marinas | b3901d5 | 2012-03-05 11:49:28 +0000 | [diff] [blame] | 139 | |
AKASHI Takahiro | 449f81a | 2014-04-30 10:51:29 +0100 | [diff] [blame] | 140 | #define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \ |
Larry Bassel | 6c81fe7 | 2014-05-30 12:34:15 -0700 | [diff] [blame] | 141 | _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP | \ |
| 142 | _TIF_NOHZ) |
Catalin Marinas | b3901d5 | 2012-03-05 11:49:28 +0000 | [diff] [blame] | 143 | |
| 144 | #endif /* __KERNEL__ */ |
| 145 | #endif /* __ASM_THREAD_INFO_H */ |