1 /* 2 * arch/arm/include/asm/thread_info.h 3 * 4 * Copyright (C) 2002 Russell King. 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 */ 10 #ifndef __ASM_ARM_THREAD_INFO_H 11 #define __ASM_ARM_THREAD_INFO_H 12 13 #ifdef __KERNEL__ 14 15 #include <linux/compiler.h> 16 #include <asm/fpstate.h> 17 18 #define THREAD_SIZE_ORDER 1 19 #define THREAD_SIZE 8192 20 #define THREAD_START_SP (THREAD_SIZE - 8) 21 22 #ifndef __ASSEMBLY__ 23 24 struct task_struct; 25 struct exec_domain; 26 27 #include <asm/types.h> 28 #include <asm/domain.h> 29 30 typedef unsigned long mm_segment_t; 31 32 struct cpu_context_save { 33 __u32 r4; 34 __u32 r5; 35 __u32 r6; 36 __u32 r7; 37 __u32 r8; 38 __u32 r9; 39 __u32 sl; 40 __u32 fp; 41 __u32 sp; 42 __u32 pc; 43 __u32 extra[2]; /* Xscale 'acc' register, etc */ 44 }; 45 46 struct arm_restart_block { 47 union { 48 /* For user cache flushing */ 49 struct { 50 unsigned long start; 51 unsigned long end; 52 } cache; 53 }; 54 }; 55 56 /* 57 * low level task data that entry.S needs immediate access to. 58 * __switch_to() assumes cpu_context follows immediately after cpu_domain. 59 */ 60 struct thread_info { 61 unsigned long flags; /* low level flags */ 62 int preempt_count; /* 0 => preemptable, <0 => bug */ 63 mm_segment_t addr_limit; /* address limit */ 64 struct task_struct *task; /* main task structure */ 65 struct exec_domain *exec_domain; /* execution domain */ 66 __u32 cpu; /* cpu */ 67 __u32 cpu_domain; /* cpu domain */ 68 struct cpu_context_save cpu_context; /* cpu context */ 69 __u32 syscall; /* syscall number */ 70 __u8 used_cp[16]; /* thread used copro */ 71 unsigned long tp_value[2]; /* TLS registers */ 72 #ifdef CONFIG_CRUNCH 73 struct crunch_state crunchstate; 74 #endif 75 union fp_state fpstate __attribute__((aligned(8))); 76 union vfp_state vfpstate; 77 #ifdef CONFIG_ARM_THUMBEE 78 unsigned long thumbee_state; /* ThumbEE Handler Base register */ 79 #endif 80 struct restart_block restart_block; 81 struct arm_restart_block arm_restart_block; 82 }; 83 84 #define INIT_THREAD_INFO(tsk) \ 85 { \ 86 .task = &tsk, \ 87 .exec_domain = &default_exec_domain, \ 88 .flags = 0, \ 89 .preempt_count = INIT_PREEMPT_COUNT, \ 90 .addr_limit = KERNEL_DS, \ 91 .cpu_domain = domain_val(DOMAIN_USER, DOMAIN_MANAGER) | \ 92 domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) | \ 93 domain_val(DOMAIN_IO, DOMAIN_CLIENT), \ 94 .restart_block = { \ 95 .fn = do_no_restart_syscall, \ 96 }, \ 97 } 98 99 #define init_thread_info (init_thread_union.thread_info) 100 #define init_stack (init_thread_union.stack) 101 102 /* 103 * how to get the thread information struct from C 104 */ 105 static inline struct thread_info *current_thread_info(void) __attribute_const__; 106 107 static inline struct thread_info *current_thread_info(void) 108 { 109 register unsigned long sp asm ("sp"); 110 return (struct thread_info *)(sp & ~(THREAD_SIZE - 1)); 111 } 112 113 #define thread_saved_pc(tsk) \ 114 ((unsigned long)(task_thread_info(tsk)->cpu_context.pc)) 115 #define thread_saved_sp(tsk) \ 116 ((unsigned long)(task_thread_info(tsk)->cpu_context.sp)) 117 #define thread_saved_fp(tsk) \ 118 ((unsigned long)(task_thread_info(tsk)->cpu_context.fp)) 119 120 extern void crunch_task_disable(struct thread_info *); 121 extern void crunch_task_copy(struct thread_info *, void *); 122 extern void crunch_task_restore(struct thread_info *, void *); 123 extern void crunch_task_release(struct thread_info *); 124 125 extern void iwmmxt_task_disable(struct thread_info *); 126 extern void iwmmxt_task_copy(struct thread_info *, void *); 127 extern void iwmmxt_task_restore(struct thread_info *, void *); 128 extern void iwmmxt_task_release(struct thread_info *); 129 extern void iwmmxt_task_switch(struct thread_info *); 130 131 extern void vfp_sync_hwstate(struct thread_info *); 132 extern void vfp_flush_hwstate(struct thread_info *); 133 134 struct user_vfp; 135 struct user_vfp_exc; 136 137 extern int vfp_preserve_user_clear_hwstate(struct user_vfp __user *, 138 struct user_vfp_exc __user *); 139 extern int vfp_restore_user_hwstate(struct user_vfp __user *, 140 struct user_vfp_exc __user *); 141 #endif 142 143 /* 144 * We use bit 30 of the preempt_count to indicate that kernel 145 * preemption is occurring. See <asm/hardirq.h>. 146 */ 147 #define PREEMPT_ACTIVE 0x40000000 148 149 /* 150 * thread information flags: 151 * TIF_SYSCALL_TRACE - syscall trace active 152 * TIF_SYSCAL_AUDIT - syscall auditing active 153 * TIF_SIGPENDING - signal pending 154 * TIF_NEED_RESCHED - rescheduling necessary 155 * TIF_NOTIFY_RESUME - callback before returning to user 156 * TIF_USEDFPU - FPU was used by this task this quantum (SMP) 157 * TIF_POLLING_NRFLAG - true if poll_idle() is polling TIF_NEED_RESCHED 158 */ 159 #define TIF_SIGPENDING 0 160 #define TIF_NEED_RESCHED 1 161 #define TIF_NOTIFY_RESUME 2 /* callback before returning to user */ 162 #define TIF_SYSCALL_TRACE 8 163 #define TIF_SYSCALL_AUDIT 9 164 #define TIF_SYSCALL_TRACEPOINT 10 165 #define TIF_SECCOMP 11 /* seccomp syscall filtering active */ 166 #define TIF_NOHZ 12 /* in adaptive nohz mode */ 167 #define TIF_USING_IWMMXT 17 168 #define TIF_MEMDIE 18 /* is terminating due to OOM killer */ 169 #define TIF_RESTORE_SIGMASK 20 170 171 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) 172 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) 173 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) 174 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) 175 #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) 176 #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT) 177 #define _TIF_SECCOMP (1 << TIF_SECCOMP) 178 #define _TIF_USING_IWMMXT (1 << TIF_USING_IWMMXT) 179 180 /* Checks for any syscall work in entry-common.S */ 181 #define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \ 182 _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP) 183 184 /* 185 * Change these and you break ASM code in entry-common.S 186 */ 187 #define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | _TIF_NOTIFY_RESUME) 188 189 #endif /* __KERNEL__ */ 190 #endif /* __ASM_ARM_THREAD_INFO_H */ 191