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 struct exec_domain; 28 29 #include <asm/types.h> 30 31 typedef struct { 32 unsigned long seg; 33 } mm_segment_t; 34 35 struct cpu_context_save { 36 __u32 r4; 37 __u32 r5; 38 __u32 r6; 39 __u32 r7; 40 __u32 r8; 41 __u32 r9; 42 __u32 r10; 43 __u32 r11; 44 __u32 r12; 45 __u32 r13; 46 __u32 r14; 47 __u32 r15; 48 __u32 r16; 49 __u32 r17; 50 __u32 r18; 51 __u32 r19; 52 __u32 r20; 53 __u32 r21; 54 __u32 r22; 55 __u32 r23; 56 __u32 r24; 57 __u32 r25; 58 __u32 r26; 59 __u32 fp; 60 __u32 sp; 61 __u32 pc; 62 }; 63 64 /* 65 * low level task data that entry.S needs immediate access to. 66 * __switch_to() assumes cpu_context follows immediately after cpu_domain. 67 */ 68 struct thread_info { 69 unsigned long flags; /* low level flags */ 70 int preempt_count; /* 0 => preemptable */ 71 /* <0 => bug */ 72 mm_segment_t addr_limit; /* address limit */ 73 struct task_struct *task; /* main task structure */ 74 struct exec_domain *exec_domain; /* execution domain */ 75 __u32 cpu; /* cpu */ 76 struct cpu_context_save cpu_context; /* cpu context */ 77 __u32 syscall; /* syscall number */ 78 __u8 used_cp[16]; /* thread used copro */ 79 #ifdef CONFIG_UNICORE_FPU_F64 80 struct fp_state fpstate __attribute__((aligned(8))); 81 #endif 82 struct restart_block restart_block; 83 }; 84 85 #define INIT_THREAD_INFO(tsk) \ 86 { \ 87 .task = &tsk, \ 88 .exec_domain = &default_exec_domain, \ 89 .flags = 0, \ 90 .preempt_count = INIT_PREEMPT_COUNT, \ 91 .addr_limit = KERNEL_DS, \ 92 .restart_block = { \ 93 .fn = do_no_restart_syscall, \ 94 }, \ 95 } 96 97 #define init_thread_info (init_thread_union.thread_info) 98 #define init_stack (init_thread_union.stack) 99 100 /* 101 * how to get the thread information struct from C 102 */ 103 static inline struct thread_info *current_thread_info(void) __attribute_const__; 104 current_thread_info(void)105static inline struct thread_info *current_thread_info(void) 106 { 107 register unsigned long sp asm ("sp"); 108 return (struct thread_info *)(sp & ~(THREAD_SIZE - 1)); 109 } 110 111 #define thread_saved_pc(tsk) \ 112 ((unsigned long)(task_thread_info(tsk)->cpu_context.pc)) 113 #define thread_saved_sp(tsk) \ 114 ((unsigned long)(task_thread_info(tsk)->cpu_context.sp)) 115 #define thread_saved_fp(tsk) \ 116 ((unsigned long)(task_thread_info(tsk)->cpu_context.fp)) 117 118 #endif 119 120 /* 121 * We use bit 30 of the preempt_count to indicate that kernel 122 * preemption is occurring. See <asm/hardirq.h>. 123 */ 124 #define PREEMPT_ACTIVE 0x40000000 125 126 /* 127 * thread information flags: 128 * TIF_SYSCALL_TRACE - syscall trace active 129 * TIF_SIGPENDING - signal pending 130 * TIF_NEED_RESCHED - rescheduling necessary 131 * TIF_NOTIFY_RESUME - callback before returning to user 132 */ 133 #define TIF_SIGPENDING 0 134 #define TIF_NEED_RESCHED 1 135 #define TIF_NOTIFY_RESUME 2 /* callback before returning to user */ 136 #define TIF_SYSCALL_TRACE 8 137 #define TIF_MEMDIE 18 138 #define TIF_RESTORE_SIGMASK 20 139 140 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) 141 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) 142 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) 143 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) 144 #define _TIF_RESTORE_SIGMASK (1 << TIF_RESTORE_SIGMASK) 145 146 /* 147 * Change these and you break ASM code in entry-common.S 148 */ 149 #define _TIF_WORK_MASK 0x000000ff 150 151 #endif /* __KERNEL__ */ 152 #endif /* __UNICORE_THREAD_INFO_H__ */ 153