1/* 2 * linux/include/asm-arm26/thread_info.h 3 * 4 * Copyright (C) 2002 Russell King. 5 * Copyright (C) 2003 Ian Molton. 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#ifndef __ASM_ARM_THREAD_INFO_H 12#define __ASM_ARM_THREAD_INFO_H 13 14#ifdef __KERNEL__ 15 16#ifndef __ASSEMBLY__ 17 18struct task_struct; 19struct exec_domain; 20 21#include <linux/compiler.h> 22#include <asm/fpstate.h> 23#include <asm/ptrace.h> 24#include <asm/types.h> 25 26typedef unsigned long mm_segment_t; 27 28struct cpu_context_save { 29 __u32 r4; 30 __u32 r5; 31 __u32 r6; 32 __u32 r7; 33 __u32 r8; 34 __u32 r9; 35 __u32 sl; 36 __u32 fp; 37 __u32 sp; 38 __u32 pc; 39}; 40 41/* 42 * low level task data that entry.S needs immediate access to. 43 * We assume cpu_context follows immedately after cpu_domain. 44 */ 45struct thread_info { 46 unsigned long flags; /* low level flags */ 47 int preempt_count; /* 0 => preemptable, <0 => bug */ 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 __u32 cpu; /* cpu */ 52 struct cpu_context_save cpu_context; /* cpu context */ 53 struct restart_block restart_block; 54 union fp_state fpstate; 55}; 56 57#define INIT_THREAD_INFO(tsk) \ 58{ \ 59 .task &tsk, \ 60 .exec_domain &default_exec_domain, \ 61 .flags 0, \ 62 .preempt_count 0, \ 63 .addr_limit KERNEL_DS, \ 64 .restart_block = { \ 65 .fn = do_no_restart_syscall, \ 66 }, \ 67} 68 69#define init_thread_info (init_thread_union.thread_info) 70#define init_stack (init_thread_union.stack) 71 72/* 73 * how to get the thread information struct from C 74 */ 75static inline struct thread_info *current_thread_info(void) __attribute_const__; 76 77static inline struct thread_info *current_thread_info(void) 78{ 79 register unsigned long sp asm ("sp"); 80 return (struct thread_info *)(sp & ~0x1fff); 81} 82 83#define THREAD_SIZE PAGE_SIZE 84#define task_pt_regs(task) ((struct pt_regs *)(task_stack_page(task) + THREAD_SIZE - 8) - 1) 85 86extern struct thread_info *alloc_thread_info(struct task_struct *task); 87extern void free_thread_info(struct thread_info *); 88 89#define thread_saved_pc(tsk) \ 90 ((unsigned long)(pc_pointer(task_thread_info(tsk)->cpu_context.pc))) 91#define thread_saved_fp(tsk) \ 92 ((unsigned long)(task_thread_info(tsk)->cpu_context.fp)) 93 94#else /* !__ASSEMBLY__ */ 95 96#define TI_FLAGS 0 97#define TI_PREEMPT 4 98#define TI_ADDR_LIMIT 8 99#define TI_TASK 12 100#define TI_EXEC_DOMAIN 16 101#define TI_CPU 20 102#define TI_CPU_SAVE 24 103#define TI_RESTART_BLOCK 28 104#define TI_FPSTATE 68 105 106#endif 107 108#define PREEMPT_ACTIVE 0x04000000 109 110/* 111 * thread information flags: 112 * TIF_SYSCALL_TRACE - syscall trace active 113 * TIF_NOTIFY_RESUME - resumption notification requested 114 * TIF_SIGPENDING - signal pending 115 * TIF_NEED_RESCHED - rescheduling necessary 116 * TIF_USEDFPU - FPU was used by this task this quantum (SMP) 117 * TIF_POLLING_NRFLAG - true if poll_idle() is polling TIF_NEED_RESCHED 118 */ 119#define TIF_NOTIFY_RESUME 0 120#define TIF_SIGPENDING 1 121#define TIF_NEED_RESCHED 2 122#define TIF_SYSCALL_TRACE 8 123#define TIF_USED_FPU 16 124#define TIF_POLLING_NRFLAG 17 125#define TIF_MEMDIE 18 126 127#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) 128#define _TIF_SIGPENDING (1 << TIF_SIGPENDING) 129#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) 130#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) 131#define _TIF_USED_FPU (1 << TIF_USED_FPU) 132#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG) 133 134/* 135 * Change these and you break ASM code in entry-common.S 136 */ 137#define _TIF_WORK_MASK 0x000000ff 138 139#endif /* __KERNEL__ */ 140#endif /* __ASM_ARM_THREAD_INFO_H */ 141