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 /* 47 * low level task data that entry.S needs immediate access to. 48 * __switch_to() assumes cpu_context follows immediately after cpu_domain. 49 */ 50 struct thread_info { 51 unsigned long flags; /* low level flags */ 52 int preempt_count; /* 0 => preemptable, <0 => bug */ 53 mm_segment_t addr_limit; /* address limit */ 54 struct task_struct *task; /* main task structure */ 55 struct exec_domain *exec_domain; /* execution domain */ 56 __u32 cpu; /* cpu */ 57 __u32 cpu_domain; /* cpu domain */ 58 struct cpu_context_save cpu_context; /* cpu context */ 59 __u32 syscall; /* syscall number */ 60 __u8 used_cp[16]; /* thread used copro */ 61 unsigned long tp_value; 62 struct crunch_state crunchstate; 63 union fp_state fpstate __attribute__((aligned(8))); 64 union vfp_state vfpstate; 65 #ifdef CONFIG_ARM_THUMBEE 66 unsigned long thumbee_state; /* ThumbEE Handler Base register */ 67 #endif 68 struct restart_block restart_block; 69 }; 70 71 #define INIT_THREAD_INFO(tsk) \ 72 { \ 73 .task = &tsk, \ 74 .exec_domain = &default_exec_domain, \ 75 .flags = 0, \ 76 .preempt_count = INIT_PREEMPT_COUNT, \ 77 .addr_limit = KERNEL_DS, \ 78 .cpu_domain = domain_val(DOMAIN_USER, DOMAIN_MANAGER) | \ 79 domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) | \ 80 domain_val(DOMAIN_IO, DOMAIN_CLIENT), \ 81 .restart_block = { \ 82 .fn = do_no_restart_syscall, \ 83 }, \ 84 } 85 86 #define init_thread_info (init_thread_union.thread_info) 87 #define init_stack (init_thread_union.stack) 88 89 /* 90 * how to get the thread information struct from C 91 */ 92 static inline struct thread_info *current_thread_info(void) __attribute_const__; 93 94 static inline struct thread_info *current_thread_info(void) 95 { 96 register unsigned long sp asm ("sp"); 97 return (struct thread_info *)(sp & ~(THREAD_SIZE - 1)); 98 } 99 100 #define thread_saved_pc(tsk) \ 101 ((unsigned long)(task_thread_info(tsk)->cpu_context.pc)) 102 #define thread_saved_sp(tsk) \ 103 ((unsigned long)(task_thread_info(tsk)->cpu_context.sp)) 104 #define thread_saved_fp(tsk) \ 105 ((unsigned long)(task_thread_info(tsk)->cpu_context.fp)) 106 107 extern void crunch_task_disable(struct thread_info *); 108 extern void crunch_task_copy(struct thread_info *, void *); 109 extern void crunch_task_restore(struct thread_info *, void *); 110 extern void crunch_task_release(struct thread_info *); 111 112 extern void iwmmxt_task_disable(struct thread_info *); 113 extern void iwmmxt_task_copy(struct thread_info *, void *); 114 extern void iwmmxt_task_restore(struct thread_info *, void *); 115 extern void iwmmxt_task_release(struct thread_info *); 116 extern void iwmmxt_task_switch(struct thread_info *); 117 118 extern void vfp_sync_hwstate(struct thread_info *); 119 extern void vfp_flush_hwstate(struct thread_info *); 120 121 #endif 122 123 /* 124 * We use bit 30 of the preempt_count to indicate that kernel 125 * preemption is occurring. See <asm/hardirq.h>. 126 */ 127 #define PREEMPT_ACTIVE 0x40000000 128 129 /* 130 * thread information flags: 131 * TIF_SYSCALL_TRACE - syscall trace active 132 * TIF_SIGPENDING - signal pending 133 * TIF_NEED_RESCHED - rescheduling necessary 134 * TIF_NOTIFY_RESUME - callback before returning to user 135 * TIF_USEDFPU - FPU was used by this task this quantum (SMP) 136 * TIF_POLLING_NRFLAG - true if poll_idle() is polling TIF_NEED_RESCHED 137 */ 138 #define TIF_SIGPENDING 0 139 #define TIF_NEED_RESCHED 1 140 #define TIF_NOTIFY_RESUME 2 /* callback before returning to user */ 141 #define TIF_SYSCALL_TRACE 8 142 #define TIF_POLLING_NRFLAG 16 143 #define TIF_USING_IWMMXT 17 144 #define TIF_MEMDIE 18 /* is terminating due to OOM killer */ 145 #define TIF_FREEZE 19 146 #define TIF_RESTORE_SIGMASK 20 147 #define TIF_SECCOMP 21 148 149 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) 150 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) 151 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) 152 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) 153 #define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG) 154 #define _TIF_USING_IWMMXT (1 << TIF_USING_IWMMXT) 155 #define _TIF_FREEZE (1 << TIF_FREEZE) 156 #define _TIF_RESTORE_SIGMASK (1 << TIF_RESTORE_SIGMASK) 157 #define _TIF_SECCOMP (1 << TIF_SECCOMP) 158 159 /* 160 * Change these and you break ASM code in entry-common.S 161 */ 162 #define _TIF_WORK_MASK 0x000000ff 163 164 #endif /* __KERNEL__ */ 165 #endif /* __ASM_ARM_THREAD_INFO_H */ 166