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 26 #ifdef CONFIG_ARM64_4K_PAGES 27 #define THREAD_SIZE_ORDER 2 28 #elif defined(CONFIG_ARM64_16K_PAGES) 29 #define THREAD_SIZE_ORDER 0 30 #endif 31 32 #define THREAD_SIZE 16384 33 #define THREAD_START_SP (THREAD_SIZE - 16) 34 35 #ifndef __ASSEMBLY__ 36 37 struct task_struct; 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 */ 51 int preempt_count; /* 0 => preemptable, <0 => bug */ 52 int cpu; /* cpu */ 53 }; 54 55 #define INIT_THREAD_INFO(tsk) \ 56 { \ 57 .task = &tsk, \ 58 .flags = 0, \ 59 .preempt_count = INIT_PREEMPT_COUNT, \ 60 .addr_limit = KERNEL_DS, \ 61 } 62 63 #define init_thread_info (init_thread_union.thread_info) 64 #define init_stack (init_thread_union.stack) 65 66 /* 67 * how to get the current stack pointer from C 68 */ 69 register unsigned long current_stack_pointer asm ("sp"); 70 71 /* 72 * how to get the thread information struct from C 73 */ 74 static inline struct thread_info *current_thread_info(void) __attribute_const__; 75 76 /* 77 * struct thread_info can be accessed directly via sp_el0. 78 * 79 * We don't use read_sysreg() as we want the compiler to cache the value where 80 * possible. 81 */ 82 static inline struct thread_info *current_thread_info(void) 83 { 84 unsigned long sp_el0; 85 86 asm ("mrs %0, sp_el0" : "=r" (sp_el0)); 87 88 return (struct thread_info *)sp_el0; 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 /* 101 * thread information flags: 102 * TIF_SYSCALL_TRACE - syscall trace active 103 * TIF_SYSCALL_TRACEPOINT - syscall tracepoint for ftrace 104 * TIF_SYSCALL_AUDIT - syscall auditing 105 * TIF_SECOMP - syscall secure computing 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) 110 */ 111 #define TIF_SIGPENDING 0 112 #define TIF_NEED_RESCHED 1 113 #define TIF_NOTIFY_RESUME 2 /* callback before returning to user */ 114 #define TIF_FOREIGN_FPSTATE 3 /* CPU's FP state is not current's */ 115 #define TIF_NOHZ 7 116 #define TIF_SYSCALL_TRACE 8 117 #define TIF_SYSCALL_AUDIT 9 118 #define TIF_SYSCALL_TRACEPOINT 10 119 #define TIF_SECCOMP 11 120 #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 */ 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) 129 #define _TIF_FOREIGN_FPSTATE (1 << TIF_FOREIGN_FPSTATE) 130 #define _TIF_NOHZ (1 << TIF_NOHZ) 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) 135 #define _TIF_32BIT (1 << TIF_32BIT) 136 137 #define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \ 138 _TIF_NOTIFY_RESUME | _TIF_FOREIGN_FPSTATE) 139 140 #define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \ 141 _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP | \ 142 _TIF_NOHZ) 143 144 #endif /* __KERNEL__ */ 145 #endif /* __ASM_THREAD_INFO_H */ 146