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 unsigned long flags; /* low level flags */ 69 unsigned long status; /* thread-synchronous flags */ 70 __u32 cpu; /* current CPU */ 71 __s32 preempt_count; /* 0 => preemptable,< 0 => BUG*/ 72 mm_segment_t addr_limit; /* thread address space */ 73 74 struct cpu_context cpu_context; 75 }; 76 77 /* 78 * macros/functions for gaining access to the thread information structure 79 */ 80 #define INIT_THREAD_INFO(tsk) \ 81 { \ 82 .task = &tsk, \ 83 .flags = 0, \ 84 .cpu = 0, \ 85 .preempt_count = INIT_PREEMPT_COUNT, \ 86 .addr_limit = KERNEL_DS, \ 87 } 88 89 #define init_thread_info (init_thread_union.thread_info) 90 #define init_stack (init_thread_union.stack) 91 92 /* how to get the thread information struct from C */ 93 static inline struct thread_info *current_thread_info(void) 94 { 95 register unsigned long sp asm("r1"); 96 97 return (struct thread_info *)(sp & ~(THREAD_SIZE-1)); 98 } 99 100 /* thread information allocation */ 101 #endif /* __ASSEMBLY__ */ 102 103 /* 104 * thread information flags 105 * - these are process state flags that various assembly files may 106 * need to access 107 * - pending work-to-be-done flags are in LSW 108 * - other flags in MSW 109 */ 110 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 111 #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ 112 #define TIF_SIGPENDING 2 /* signal pending */ 113 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ 114 /* restore singlestep on return to user mode */ 115 #define TIF_SINGLESTEP 4 116 #define TIF_MEMDIE 6 /* is terminating due to OOM killer */ 117 #define TIF_SYSCALL_AUDIT 9 /* syscall auditing active */ 118 #define TIF_SECCOMP 10 /* secure computing */ 119 120 /* true if poll_idle() is polling TIF_NEED_RESCHED */ 121 #define TIF_POLLING_NRFLAG 16 122 123 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) 124 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) 125 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) 126 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) 127 #define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP) 128 #define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG) 129 #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) 130 #define _TIF_SECCOMP (1 << TIF_SECCOMP) 131 132 /* work to do in syscall trace */ 133 #define _TIF_WORK_SYSCALL_MASK (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \ 134 _TIF_SYSCALL_AUDIT | _TIF_SECCOMP) 135 136 /* work to do on interrupt/exception return */ 137 #define _TIF_WORK_MASK 0x0000FFFE 138 139 /* work to do on any return to u-space */ 140 #define _TIF_ALLWORK_MASK 0x0000FFFF 141 142 /* 143 * Thread-synchronous status. 144 * 145 * This is different from the flags in that nobody else 146 * ever touches our thread-synchronous status, so we don't 147 * have to worry about atomic accesses. 148 */ 149 /* FPU was used by this task this quantum (SMP) */ 150 #define TS_USEDFPU 0x0001 151 #define TS_RESTORE_SIGMASK 0x0002 152 153 #ifndef __ASSEMBLY__ 154 #define HAVE_SET_RESTORE_SIGMASK 1 155 static inline void set_restore_sigmask(void) 156 { 157 struct thread_info *ti = current_thread_info(); 158 ti->status |= TS_RESTORE_SIGMASK; 159 WARN_ON(!test_bit(TIF_SIGPENDING, (unsigned long *)&ti->flags)); 160 } 161 static inline void clear_restore_sigmask(void) 162 { 163 current_thread_info()->status &= ~TS_RESTORE_SIGMASK; 164 } 165 static inline bool test_restore_sigmask(void) 166 { 167 return current_thread_info()->status & TS_RESTORE_SIGMASK; 168 } 169 static inline bool test_and_clear_restore_sigmask(void) 170 { 171 struct thread_info *ti = current_thread_info(); 172 if (!(ti->status & TS_RESTORE_SIGMASK)) 173 return false; 174 ti->status &= ~TS_RESTORE_SIGMASK; 175 return true; 176 } 177 #endif 178 179 #endif /* __KERNEL__ */ 180 #endif /* _ASM_MICROBLAZE_THREAD_INFO_H */ 181