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 #ifndef CONFIG_ARM64_64K_PAGES 27 #define THREAD_SIZE_ORDER 1 28 #endif 29 30 #define THREAD_SIZE 8192 31 #define THREAD_START_SP (THREAD_SIZE - 16) 32 33 #ifndef __ASSEMBLY__ 34 35 struct task_struct; 36 struct exec_domain; 37 38 #include <asm/types.h> 39 40 typedef unsigned long mm_segment_t; 41 42 /* 43 * low level task data that entry.S needs immediate access to. 44 * __switch_to() assumes cpu_context follows immediately after cpu_domain. 45 */ 46 struct thread_info { 47 unsigned long flags; /* low level flags */ 48 mm_segment_t addr_limit; /* address limit */ 49 struct task_struct *task; /* main task structure */ 50 struct exec_domain *exec_domain; /* execution domain */ 51 struct restart_block restart_block; 52 int preempt_count; /* 0 => preemptable, <0 => bug */ 53 int cpu; /* cpu */ 54 }; 55 56 #define INIT_THREAD_INFO(tsk) \ 57 { \ 58 .task = &tsk, \ 59 .exec_domain = &default_exec_domain, \ 60 .flags = 0, \ 61 .preempt_count = INIT_PREEMPT_COUNT, \ 62 .addr_limit = KERNEL_DS, \ 63 .restart_block = { \ 64 .fn = do_no_restart_syscall, \ 65 }, \ 66 } 67 68 #define init_thread_info (init_thread_union.thread_info) 69 #define init_stack (init_thread_union.stack) 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 static inline struct thread_info *current_thread_info(void) 77 { 78 register unsigned long sp asm ("sp"); 79 return (struct thread_info *)(sp & ~(THREAD_SIZE - 1)); 80 } 81 82 #define thread_saved_pc(tsk) \ 83 ((unsigned long)(tsk->thread.cpu_context.pc)) 84 #define thread_saved_sp(tsk) \ 85 ((unsigned long)(tsk->thread.cpu_context.sp)) 86 #define thread_saved_fp(tsk) \ 87 ((unsigned long)(tsk->thread.cpu_context.fp)) 88 89 #endif 90 91 /* 92 * We use bit 30 of the preempt_count to indicate that kernel 93 * preemption is occurring. See <asm/hardirq.h>. 94 */ 95 #define PREEMPT_ACTIVE 0x40000000 96 97 /* 98 * thread information flags: 99 * TIF_SYSCALL_TRACE - syscall trace active 100 * TIF_SIGPENDING - signal pending 101 * TIF_NEED_RESCHED - rescheduling necessary 102 * TIF_NOTIFY_RESUME - callback before returning to user 103 * TIF_USEDFPU - FPU was used by this task this quantum (SMP) 104 * TIF_POLLING_NRFLAG - true if poll_idle() is polling TIF_NEED_RESCHED 105 */ 106 #define TIF_SIGPENDING 0 107 #define TIF_NEED_RESCHED 1 108 #define TIF_NOTIFY_RESUME 2 /* callback before returning to user */ 109 #define TIF_SYSCALL_TRACE 8 110 #define TIF_POLLING_NRFLAG 16 111 #define TIF_MEMDIE 18 /* is terminating due to OOM killer */ 112 #define TIF_FREEZE 19 113 #define TIF_RESTORE_SIGMASK 20 114 #define TIF_SINGLESTEP 21 115 #define TIF_32BIT 22 /* 32bit process */ 116 #define TIF_SWITCH_MM 23 /* deferred switch_mm */ 117 118 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) 119 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) 120 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) 121 #define _TIF_32BIT (1 << TIF_32BIT) 122 123 #define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \ 124 _TIF_NOTIFY_RESUME) 125 126 #endif /* __KERNEL__ */ 127 #endif /* __ASM_THREAD_INFO_H */ 128