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 24 struct task_struct; 25 struct exec_domain; 26 27 #include <asm/ptrace.h> 28 #include <asm/types.h> 29 #include <asm/domain.h> 30 31 typedef unsigned long mm_segment_t; 32 33 struct 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 */ 51 struct 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 __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 struct restart_block restart_block; 66 }; 67 68 #define INIT_THREAD_INFO(tsk) \ 69 { \ 70 .task = &tsk, \ 71 .exec_domain = &default_exec_domain, \ 72 .flags = 0, \ 73 .preempt_count = 1, \ 74 .addr_limit = KERNEL_DS, \ 75 .cpu_domain = domain_val(DOMAIN_USER, DOMAIN_MANAGER) | \ 76 domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) | \ 77 domain_val(DOMAIN_IO, DOMAIN_CLIENT), \ 78 .restart_block = { \ 79 .fn = do_no_restart_syscall, \ 80 }, \ 81 } 82 83 #define init_thread_info (init_thread_union.thread_info) 84 #define init_stack (init_thread_union.stack) 85 86 /* 87 * how to get the thread information struct from C 88 */ 89 static inline struct thread_info *current_thread_info(void) __attribute_const__; 90 91 static inline struct thread_info *current_thread_info(void) 92 { 93 register unsigned long sp asm ("sp"); 94 return (struct thread_info *)(sp & ~(THREAD_SIZE - 1)); 95 } 96 97 extern struct thread_info *alloc_thread_info(struct task_struct *task); 98 extern void free_thread_info(struct thread_info *); 99 100 #define thread_saved_pc(tsk) \ 101 ((unsigned long)(pc_pointer(task_thread_info(tsk)->cpu_context.pc))) 102 #define thread_saved_fp(tsk) \ 103 ((unsigned long)(task_thread_info(tsk)->cpu_context.fp)) 104 105 extern void crunch_task_disable(struct thread_info *); 106 extern void crunch_task_copy(struct thread_info *, void *); 107 extern void crunch_task_restore(struct thread_info *, void *); 108 extern void crunch_task_release(struct thread_info *); 109 110 extern void iwmmxt_task_disable(struct thread_info *); 111 extern void iwmmxt_task_copy(struct thread_info *, void *); 112 extern void iwmmxt_task_restore(struct thread_info *, void *); 113 extern void iwmmxt_task_release(struct thread_info *); 114 extern void iwmmxt_task_switch(struct thread_info *); 115 116 #endif 117 118 /* 119 * We use bit 30 of the preempt_count to indicate that kernel 120 * preemption is occurring. See include/asm-arm/hardirq.h. 121 */ 122 #define PREEMPT_ACTIVE 0x40000000 123 124 /* 125 * thread information flags: 126 * TIF_SYSCALL_TRACE - syscall trace active 127 * TIF_NOTIFY_RESUME - resumption notification requested 128 * TIF_SIGPENDING - signal pending 129 * TIF_NEED_RESCHED - rescheduling necessary 130 * TIF_USEDFPU - FPU was used by this task this quantum (SMP) 131 * TIF_POLLING_NRFLAG - true if poll_idle() is polling TIF_NEED_RESCHED 132 */ 133 #define TIF_NOTIFY_RESUME 0 134 #define TIF_SIGPENDING 1 135 #define TIF_NEED_RESCHED 2 136 #define TIF_SYSCALL_TRACE 8 137 #define TIF_POLLING_NRFLAG 16 138 #define TIF_USING_IWMMXT 17 139 #define TIF_MEMDIE 18 140 141 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) 142 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) 143 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) 144 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) 145 #define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG) 146 #define _TIF_USING_IWMMXT (1 << TIF_USING_IWMMXT) 147 148 /* 149 * Change these and you break ASM code in entry-common.S 150 */ 151 #define _TIF_WORK_MASK 0x000000ff 152 153 #endif /* __KERNEL__ */ 154 #endif /* __ASM_ARM_THREAD_INFO_H */ 155
