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 struct restart_block restart_block; 75 76 struct cpu_context cpu_context; 77 }; 78 79 /* 80 * macros/functions for gaining access to the thread information structure 81 */ 82 #define INIT_THREAD_INFO(tsk) \ 83 { \ 84 .task = &tsk, \ 85 .exec_domain = &default_exec_domain, \ 86 .flags = 0, \ 87 .cpu = 0, \ 88 .preempt_count = INIT_PREEMPT_COUNT, \ 89 .addr_limit = KERNEL_DS, \ 90 .restart_block = { \ 91 .fn = do_no_restart_syscall, \ 92 }, \ 93 } 94 95 #define init_thread_info (init_thread_union.thread_info) 96 #define init_stack (init_thread_union.stack) 97 98 /* how to get the thread information struct from C */ 99 static inline struct thread_info *current_thread_info(void) 100 { 101 register unsigned long sp asm("r1"); 102 103 return (struct thread_info *)(sp & ~(THREAD_SIZE-1)); 104 } 105 106 /* thread information allocation */ 107 #endif /* __ASSEMBLY__ */ 108 109 #define PREEMPT_ACTIVE 0x10000000 110 111 /* 112 * thread information flags 113 * - these are process state flags that various assembly files may 114 * need to access 115 * - pending work-to-be-done flags are in LSW 116 * - other flags in MSW 117 */ 118 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 119 #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ 120 #define TIF_SIGPENDING 2 /* signal pending */ 121 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ 122 /* restore singlestep on return to user mode */ 123 #define TIF_SINGLESTEP 4 124 #define TIF_IRET 5 /* return with iret */ 125 #define TIF_MEMDIE 6 /* is terminating due to OOM killer */ 126 #define TIF_SYSCALL_AUDIT 9 /* syscall auditing active */ 127 #define TIF_SECCOMP 10 /* secure computing */ 128 129 /* true if poll_idle() is polling TIF_NEED_RESCHED */ 130 #define TIF_POLLING_NRFLAG 16 131 132 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) 133 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) 134 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) 135 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) 136 #define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP) 137 #define _TIF_IRET (1 << TIF_IRET) 138 #define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG) 139 #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) 140 #define _TIF_SECCOMP (1 << TIF_SECCOMP) 141 142 /* work to do in syscall trace */ 143 #define _TIF_WORK_SYSCALL_MASK (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \ 144 _TIF_SYSCALL_AUDIT | _TIF_SECCOMP) 145 146 /* work to do on interrupt/exception return */ 147 #define _TIF_WORK_MASK 0x0000FFFE 148 149 /* work to do on any return to u-space */ 150 #define _TIF_ALLWORK_MASK 0x0000FFFF 151 152 /* 153 * Thread-synchronous status. 154 * 155 * This is different from the flags in that nobody else 156 * ever touches our thread-synchronous status, so we don't 157 * have to worry about atomic accesses. 158 */ 159 /* FPU was used by this task this quantum (SMP) */ 160 #define TS_USEDFPU 0x0001 161 #define TS_RESTORE_SIGMASK 0x0002 162 163 #ifndef __ASSEMBLY__ 164 #define HAVE_SET_RESTORE_SIGMASK 1 165 static inline void set_restore_sigmask(void) 166 { 167 struct thread_info *ti = current_thread_info(); 168 ti->status |= TS_RESTORE_SIGMASK; 169 WARN_ON(!test_bit(TIF_SIGPENDING, (unsigned long *)&ti->flags)); 170 } 171 static inline void clear_restore_sigmask(void) 172 { 173 current_thread_info()->status &= ~TS_RESTORE_SIGMASK; 174 } 175 static inline bool test_restore_sigmask(void) 176 { 177 return current_thread_info()->status & TS_RESTORE_SIGMASK; 178 } 179 static inline bool test_and_clear_restore_sigmask(void) 180 { 181 struct thread_info *ti = current_thread_info(); 182 if (!(ti->status & TS_RESTORE_SIGMASK)) 183 return false; 184 ti->status &= ~TS_RESTORE_SIGMASK; 185 return true; 186 } 187 #endif 188 189 #endif /* __KERNEL__ */ 190 #endif /* _ASM_MICROBLAZE_THREAD_INFO_H */ 191