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 26 struct task_struct; 27 28 #include <asm/types.h> 29 30 typedef struct { 31 unsigned long seg; 32 } mm_segment_t; 33 34 struct 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 */ 67 struct 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 /* 91 * how to get the thread information struct from C 92 */ 93 static inline struct thread_info *current_thread_info(void) __attribute_const__; 94 current_thread_info(void)95static inline struct thread_info *current_thread_info(void) 96 { 97 register unsigned long sp asm ("sp"); 98 return (struct thread_info *)(sp & ~(THREAD_SIZE - 1)); 99 } 100 101 #define thread_saved_pc(tsk) \ 102 ((unsigned long)(task_thread_info(tsk)->cpu_context.pc)) 103 #define thread_saved_sp(tsk) \ 104 ((unsigned long)(task_thread_info(tsk)->cpu_context.sp)) 105 #define thread_saved_fp(tsk) \ 106 ((unsigned long)(task_thread_info(tsk)->cpu_context.fp)) 107 108 #endif 109 110 /* 111 * thread information flags: 112 * TIF_SYSCALL_TRACE - syscall trace active 113 * TIF_SIGPENDING - signal pending 114 * TIF_NEED_RESCHED - rescheduling necessary 115 * TIF_NOTIFY_RESUME - callback before returning to user 116 */ 117 #define TIF_SIGPENDING 0 118 #define TIF_NEED_RESCHED 1 119 #define TIF_NOTIFY_RESUME 2 /* callback before returning to user */ 120 #define TIF_SYSCALL_TRACE 8 121 #define TIF_MEMDIE 18 122 #define TIF_RESTORE_SIGMASK 20 123 124 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) 125 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) 126 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) 127 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) 128 129 /* 130 * Change these and you break ASM code in entry-common.S 131 */ 132 #define _TIF_WORK_MASK \ 133 (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_NOTIFY_RESUME) 134 135 #endif /* __KERNEL__ */ 136 #endif /* __UNICORE_THREAD_INFO_H__ */ 137