1/* 2 * linux/include/asm-arm/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 24struct task_struct; 25struct exec_domain; 26 27#include <asm/ptrace.h> 28#include <asm/types.h> 29#include <asm/domain.h> 30 31typedef unsigned long mm_segment_t; 32 33struct cpu_context_save { 34 __u32 r4; 35 __u32 r5; 36 __u32 r6; 37 __u32 r7; 38 __u32 r8; 39 __u32 r9; 40 __u32 sl; 41 __u32 fp; 42 __u32 sp; 43 __u32 pc; 44 __u32 extra[2]; /* Xscale 'acc' register, etc */ 45}; 46 47/* 48 * low level task data that entry.S needs immediate access to. 49 * __switch_to() assumes cpu_context follows immediately after cpu_domain. 50 */ 51struct thread_info { 52 unsigned long flags; /* low level flags */ 53 int preempt_count; /* 0 => preemptable, <0 => bug */ 54 mm_segment_t addr_limit; /* address limit */ 55 struct task_struct *task; /* main task structure */ 56 struct exec_domain *exec_domain; /* execution domain */ 57 __u32 cpu; /* cpu */ 58 __u32 cpu_domain; /* cpu domain */ 59 struct cpu_context_save cpu_context; /* cpu context */ 60 __u32 syscall; /* syscall number */ 61 __u8 used_cp[16]; /* thread used copro */ 62 unsigned long tp_value; 63 struct crunch_state crunchstate; 64 union fp_state fpstate __attribute__((aligned(8))); 65 union vfp_state vfpstate; 66 struct restart_block restart_block; 67}; 68 69#define INIT_THREAD_INFO(tsk) \ 70{ \ 71 .task = &tsk, \ 72 .exec_domain = &default_exec_domain, \ 73 .flags = 0, \ 74 .preempt_count = 1, \ 75 .addr_limit = KERNEL_DS, \ 76 .cpu_domain = domain_val(DOMAIN_USER, DOMAIN_MANAGER) | \ 77 domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) | \ 78 domain_val(DOMAIN_IO, DOMAIN_CLIENT), \ 79 .restart_block = { \ 80 .fn = do_no_restart_syscall, \ 81 }, \ 82} 83 84#define init_thread_info (init_thread_union.thread_info) 85#define init_stack (init_thread_union.stack) 86 87/* 88 * how to get the thread information struct from C 89 */ 90static inline struct thread_info *current_thread_info(void) __attribute_const__; 91 92static inline struct thread_info *current_thread_info(void) 93{ 94 register unsigned long sp asm ("sp"); 95 return (struct thread_info *)(sp & ~(THREAD_SIZE - 1)); 96} 97 98/* thread information allocation */ 99#ifdef CONFIG_DEBUG_STACK_USAGE 100#define alloc_thread_info(tsk) \ 101 ((struct thread_info *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, \ 102 THREAD_SIZE_ORDER)) 103#else 104#define alloc_thread_info(tsk) \ 105 ((struct thread_info *)__get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER)) 106#endif 107 108#define free_thread_info(info) \ 109 free_pages((unsigned long)info, THREAD_SIZE_ORDER); 110 111#define thread_saved_pc(tsk) \ 112 ((unsigned long)(pc_pointer(task_thread_info(tsk)->cpu_context.pc))) 113#define thread_saved_fp(tsk) \ 114 ((unsigned long)(task_thread_info(tsk)->cpu_context.fp)) 115 116extern void crunch_task_disable(struct thread_info *); 117extern void crunch_task_copy(struct thread_info *, void *); 118extern void crunch_task_restore(struct thread_info *, void *); 119extern void crunch_task_release(struct thread_info *); 120 121extern void iwmmxt_task_disable(struct thread_info *); 122extern void iwmmxt_task_copy(struct thread_info *, void *); 123extern void iwmmxt_task_restore(struct thread_info *, void *); 124extern void iwmmxt_task_release(struct thread_info *); 125extern void iwmmxt_task_switch(struct thread_info *); 126 127#endif 128 129/* 130 * We use bit 30 of the preempt_count to indicate that kernel 131 * preemption is occurring. See include/asm-arm/hardirq.h. 132 */ 133#define PREEMPT_ACTIVE 0x40000000 134 135/* 136 * thread information flags: 137 * TIF_SYSCALL_TRACE - syscall trace active 138 * TIF_NOTIFY_RESUME - resumption notification requested 139 * TIF_SIGPENDING - signal pending 140 * TIF_NEED_RESCHED - rescheduling necessary 141 * TIF_USEDFPU - FPU was used by this task this quantum (SMP) 142 * TIF_POLLING_NRFLAG - true if poll_idle() is polling TIF_NEED_RESCHED 143 */ 144#define TIF_NOTIFY_RESUME 0 145#define TIF_SIGPENDING 1 146#define TIF_NEED_RESCHED 2 147#define TIF_SYSCALL_TRACE 8 148#define TIF_POLLING_NRFLAG 16 149#define TIF_USING_IWMMXT 17 150#define TIF_MEMDIE 18 151#define TIF_FREEZE 19 152 153#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) 154#define _TIF_SIGPENDING (1 << TIF_SIGPENDING) 155#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) 156#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) 157#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG) 158#define _TIF_USING_IWMMXT (1 << TIF_USING_IWMMXT) 159#define _TIF_FREEZE (1 << TIF_FREEZE) 160 161/* 162 * Change these and you break ASM code in entry-common.S 163 */ 164#define _TIF_WORK_MASK 0x000000ff 165 166#endif /* __KERNEL__ */ 167#endif /* __ASM_ARM_THREAD_INFO_H */ 168