1/* 2 * linux/arch/unicore32/include/asm/thread_info.h 3 * 4 * Code specific to PKUnity SoC and UniCore ISA 5 * 6 * Copyright (C) 2001-2010 GUAN Xue-tao 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 */ 12#ifndef __UNICORE_THREAD_INFO_H__ 13#define __UNICORE_THREAD_INFO_H__ 14 15#ifdef __KERNEL__ 16 17#include <linux/compiler.h> 18#include <asm/fpstate.h> 19 20#define THREAD_SIZE_ORDER 1 21#define THREAD_SIZE 8192 22#define THREAD_START_SP (THREAD_SIZE - 8) 23 24#ifndef __ASSEMBLY__ 25 26struct task_struct; 27 28#include <asm/types.h> 29 30typedef struct { 31 unsigned long seg; 32} mm_segment_t; 33 34struct cpu_context_save { 35 __u32 r4; 36 __u32 r5; 37 __u32 r6; 38 __u32 r7; 39 __u32 r8; 40 __u32 r9; 41 __u32 r10; 42 __u32 r11; 43 __u32 r12; 44 __u32 r13; 45 __u32 r14; 46 __u32 r15; 47 __u32 r16; 48 __u32 r17; 49 __u32 r18; 50 __u32 r19; 51 __u32 r20; 52 __u32 r21; 53 __u32 r22; 54 __u32 r23; 55 __u32 r24; 56 __u32 r25; 57 __u32 r26; 58 __u32 fp; 59 __u32 sp; 60 __u32 pc; 61}; 62 63/* 64 * low level task data that entry.S needs immediate access to. 65 * __switch_to() assumes cpu_context follows immediately after cpu_domain. 66 */ 67struct thread_info { 68 unsigned long flags; /* low level flags */ 69 int preempt_count; /* 0 => preemptable */ 70 /* <0 => bug */ 71 mm_segment_t addr_limit; /* address limit */ 72 struct task_struct *task; /* main task structure */ 73 __u32 cpu; /* cpu */ 74 struct cpu_context_save cpu_context; /* cpu context */ 75 __u32 syscall; /* syscall number */ 76 __u8 used_cp[16]; /* thread used copro */ 77#ifdef CONFIG_UNICORE_FPU_F64 78 struct fp_state fpstate __attribute__((aligned(8))); 79#endif 80}; 81 82#define INIT_THREAD_INFO(tsk) \ 83{ \ 84 .task = &tsk, \ 85 .flags = 0, \ 86 .preempt_count = INIT_PREEMPT_COUNT, \ 87 .addr_limit = KERNEL_DS, \ 88} 89 90#define init_thread_info (init_thread_union.thread_info) 91#define init_stack (init_thread_union.stack) 92 93/* 94 * how to get the thread information struct from C 95 */ 96static inline struct thread_info *current_thread_info(void) __attribute_const__; 97 98static inline struct thread_info *current_thread_info(void) 99{ 100 register unsigned long sp asm ("sp"); 101 return (struct thread_info *)(sp & ~(THREAD_SIZE - 1)); 102} 103 104#define thread_saved_pc(tsk) \ 105 ((unsigned long)(task_thread_info(tsk)->cpu_context.pc)) 106#define thread_saved_sp(tsk) \ 107 ((unsigned long)(task_thread_info(tsk)->cpu_context.sp)) 108#define thread_saved_fp(tsk) \ 109 ((unsigned long)(task_thread_info(tsk)->cpu_context.fp)) 110 111#endif 112 113/* 114 * thread information flags: 115 * TIF_SYSCALL_TRACE - syscall trace active 116 * TIF_SIGPENDING - signal pending 117 * TIF_NEED_RESCHED - rescheduling necessary 118 * TIF_NOTIFY_RESUME - callback before returning to user 119 */ 120#define TIF_SIGPENDING 0 121#define TIF_NEED_RESCHED 1 122#define TIF_NOTIFY_RESUME 2 /* callback before returning to user */ 123#define TIF_SYSCALL_TRACE 8 124#define TIF_MEMDIE 18 125#define TIF_RESTORE_SIGMASK 20 126 127#define _TIF_SIGPENDING (1 << TIF_SIGPENDING) 128#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) 129#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) 130#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) 131 132/* 133 * Change these and you break ASM code in entry-common.S 134 */ 135#define _TIF_WORK_MASK \ 136 (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_NOTIFY_RESUME) 137 138#endif /* __KERNEL__ */ 139#endif /* __UNICORE_THREAD_INFO_H__ */ 140