1 /* 2 * Copyright (C) 2006 Atmark Techno, Inc. 3 * 4 * This file is subject to the terms and conditions of the GNU General Public 5 * License. See the file "COPYING" in the main directory of this archive 6 * for more details. 7 */ 8 9 #ifndef _ASM_MICROBLAZE_THREAD_INFO_H 10 #define _ASM_MICROBLAZE_THREAD_INFO_H 11 12 #ifdef __KERNEL__ 13 14 /* we have 8k stack */ 15 #define THREAD_SHIFT 13 16 #define THREAD_SIZE (1 << THREAD_SHIFT) 17 #define THREAD_SIZE_ORDER 1 18 19 #ifndef __ASSEMBLY__ 20 # include <linux/types.h> 21 # include <asm/processor.h> 22 23 /* 24 * low level task data that entry.S needs immediate access to 25 * - this struct should fit entirely inside of one cache line 26 * - this struct shares the supervisor stack pages 27 * - if the contents of this structure are changed, the assembly constants 28 * must also be changed 29 */ 30 31 struct cpu_context { 32 __u32 r1; /* stack pointer */ 33 __u32 r2; 34 /* dedicated registers */ 35 __u32 r13; 36 __u32 r14; 37 __u32 r15; 38 __u32 r16; 39 __u32 r17; 40 __u32 r18; 41 /* non-volatile registers */ 42 __u32 r19; 43 __u32 r20; 44 __u32 r21; 45 __u32 r22; 46 __u32 r23; 47 __u32 r24; 48 __u32 r25; 49 __u32 r26; 50 __u32 r27; 51 __u32 r28; 52 __u32 r29; 53 __u32 r30; 54 /* r31 is used as current task pointer */ 55 /* special purpose registers */ 56 __u32 msr; 57 __u32 ear; 58 __u32 esr; 59 __u32 fsr; 60 }; 61 62 typedef struct { 63 unsigned long seg; 64 } mm_segment_t; 65 66 struct thread_info { 67 struct task_struct *task; /* main task structure */ 68 struct exec_domain *exec_domain; /* execution domain */ 69 unsigned long flags; /* low level flags */ 70 unsigned long status; /* thread-synchronous flags */ 71 __u32 cpu; /* current CPU */ 72 __s32 preempt_count; /* 0 => preemptable,< 0 => BUG*/ 73 mm_segment_t addr_limit; /* thread address space */ 74 75 struct cpu_context cpu_context; 76 }; 77 78 /* 79 * macros/functions for gaining access to the thread information structure 80 */ 81 #define INIT_THREAD_INFO(tsk) \ 82 { \ 83 .task = &tsk, \ 84 .exec_domain = &default_exec_domain, \ 85 .flags = 0, \ 86 .cpu = 0, \ 87 .preempt_count = INIT_PREEMPT_COUNT, \ 88 .addr_limit = KERNEL_DS, \ 89 } 90 91 #define init_thread_info (init_thread_union.thread_info) 92 #define init_stack (init_thread_union.stack) 93 94 /* how to get the thread information struct from C */ 95 static inline struct thread_info *current_thread_info(void) 96 { 97 register unsigned long sp asm("r1"); 98 99 return (struct thread_info *)(sp & ~(THREAD_SIZE-1)); 100 } 101 102 /* thread information allocation */ 103 #endif /* __ASSEMBLY__ */ 104 105 /* 106 * thread information flags 107 * - these are process state flags that various assembly files may 108 * need to access 109 * - pending work-to-be-done flags are in LSW 110 * - other flags in MSW 111 */ 112 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 113 #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ 114 #define TIF_SIGPENDING 2 /* signal pending */ 115 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ 116 /* restore singlestep on return to user mode */ 117 #define TIF_SINGLESTEP 4 118 #define TIF_MEMDIE 6 /* is terminating due to OOM killer */ 119 #define TIF_SYSCALL_AUDIT 9 /* syscall auditing active */ 120 #define TIF_SECCOMP 10 /* secure computing */ 121 122 /* true if poll_idle() is polling TIF_NEED_RESCHED */ 123 #define TIF_POLLING_NRFLAG 16 124 125 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) 126 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) 127 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) 128 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) 129 #define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP) 130 #define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG) 131 #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) 132 #define _TIF_SECCOMP (1 << TIF_SECCOMP) 133 134 /* work to do in syscall trace */ 135 #define _TIF_WORK_SYSCALL_MASK (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \ 136 _TIF_SYSCALL_AUDIT | _TIF_SECCOMP) 137 138 /* work to do on interrupt/exception return */ 139 #define _TIF_WORK_MASK 0x0000FFFE 140 141 /* work to do on any return to u-space */ 142 #define _TIF_ALLWORK_MASK 0x0000FFFF 143 144 /* 145 * Thread-synchronous status. 146 * 147 * This is different from the flags in that nobody else 148 * ever touches our thread-synchronous status, so we don't 149 * have to worry about atomic accesses. 150 */ 151 /* FPU was used by this task this quantum (SMP) */ 152 #define TS_USEDFPU 0x0001 153 #define TS_RESTORE_SIGMASK 0x0002 154 155 #ifndef __ASSEMBLY__ 156 #define HAVE_SET_RESTORE_SIGMASK 1 157 static inline void set_restore_sigmask(void) 158 { 159 struct thread_info *ti = current_thread_info(); 160 ti->status |= TS_RESTORE_SIGMASK; 161 WARN_ON(!test_bit(TIF_SIGPENDING, (unsigned long *)&ti->flags)); 162 } 163 static inline void clear_restore_sigmask(void) 164 { 165 current_thread_info()->status &= ~TS_RESTORE_SIGMASK; 166 } 167 static inline bool test_restore_sigmask(void) 168 { 169 return current_thread_info()->status & TS_RESTORE_SIGMASK; 170 } 171 static inline bool test_and_clear_restore_sigmask(void) 172 { 173 struct thread_info *ti = current_thread_info(); 174 if (!(ti->status & TS_RESTORE_SIGMASK)) 175 return false; 176 ti->status &= ~TS_RESTORE_SIGMASK; 177 return true; 178 } 179 #endif 180 181 #endif /* __KERNEL__ */ 182 #endif /* _ASM_MICROBLAZE_THREAD_INFO_H */ 183