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 # include <asm/segment.h> 23 24 /* 25 * low level task data that entry.S needs immediate access to 26 * - this struct should fit entirely inside of one cache line 27 * - this struct shares the supervisor stack pages 28 * - if the contents of this structure are changed, the assembly constants 29 * must also be changed 30 */ 31 32 struct cpu_context { 33 __u32 r1; /* stack pointer */ 34 __u32 r2; 35 /* dedicated registers */ 36 __u32 r13; 37 __u32 r14; 38 __u32 r15; 39 __u32 r16; 40 __u32 r17; 41 __u32 r18; 42 /* non-volatile registers */ 43 __u32 r19; 44 __u32 r20; 45 __u32 r21; 46 __u32 r22; 47 __u32 r23; 48 __u32 r24; 49 __u32 r25; 50 __u32 r26; 51 __u32 r27; 52 __u32 r28; 53 __u32 r29; 54 __u32 r30; 55 /* r31 is used as current task pointer */ 56 /* special purpose registers */ 57 __u32 msr; 58 __u32 ear; 59 __u32 esr; 60 __u32 fsr; 61 }; 62 63 struct thread_info { 64 struct task_struct *task; /* main task structure */ 65 struct exec_domain *exec_domain; /* execution domain */ 66 unsigned long flags; /* low level flags */ 67 unsigned long status; /* thread-synchronous flags */ 68 __u32 cpu; /* current CPU */ 69 __s32 preempt_count; /* 0 => preemptable,< 0 => BUG*/ 70 mm_segment_t addr_limit; /* thread address space */ 71 struct restart_block restart_block; 72 73 struct cpu_context cpu_context; 74 }; 75 76 /* 77 * macros/functions for gaining access to the thread information structure 78 */ 79 #define INIT_THREAD_INFO(tsk) \ 80 { \ 81 .task = &tsk, \ 82 .exec_domain = &default_exec_domain, \ 83 .flags = 0, \ 84 .cpu = 0, \ 85 .preempt_count = INIT_PREEMPT_COUNT, \ 86 .addr_limit = KERNEL_DS, \ 87 .restart_block = { \ 88 .fn = do_no_restart_syscall, \ 89 }, \ 90 } 91 92 #define init_thread_info (init_thread_union.thread_info) 93 #define init_stack (init_thread_union.stack) 94 95 /* how to get the thread information struct from C */ 96 static inline struct thread_info *current_thread_info(void) 97 { 98 register unsigned long sp asm("r1"); 99 100 return (struct thread_info *)(sp & ~(THREAD_SIZE-1)); 101 } 102 103 /* thread information allocation */ 104 #endif /* __ASSEMBLY__ */ 105 106 #define PREEMPT_ACTIVE 0x10000000 107 108 /* 109 * thread information flags 110 * - these are process state flags that various assembly files may 111 * need to access 112 * - pending work-to-be-done flags are in LSW 113 * - other flags in MSW 114 */ 115 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 116 #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ 117 #define TIF_SIGPENDING 2 /* signal pending */ 118 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ 119 /* restore singlestep on return to user mode */ 120 #define TIF_SINGLESTEP 4 121 #define TIF_IRET 5 /* return with iret */ 122 #define TIF_MEMDIE 6 123 #define TIF_SYSCALL_AUDIT 9 /* syscall auditing active */ 124 #define TIF_SECCOMP 10 /* secure computing */ 125 #define TIF_FREEZE 14 /* Freezing for suspend */ 126 127 /* FIXME change in entry.S */ 128 #define TIF_KERNEL_TRACE 8 /* kernel trace active */ 129 130 /* true if poll_idle() is polling TIF_NEED_RESCHED */ 131 #define TIF_POLLING_NRFLAG 16 132 133 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 134 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 135 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 136 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 137 #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP) 138 #define _TIF_IRET (1<<TIF_IRET) 139 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) 140 #define _TIF_FREEZE (1<<TIF_FREEZE) 141 #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) 142 #define _TIF_SECCOMP (1 << TIF_SECCOMP) 143 #define _TIF_KERNEL_TRACE (1 << TIF_KERNEL_TRACE) 144 145 /* work to do in syscall trace */ 146 #define _TIF_WORK_SYSCALL_MASK (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \ 147 _TIF_SYSCALL_AUDIT | _TIF_SECCOMP) 148 149 /* work to do on interrupt/exception return */ 150 #define _TIF_WORK_MASK 0x0000FFFE 151 152 /* work to do on any return to u-space */ 153 #define _TIF_ALLWORK_MASK 0x0000FFFF 154 155 /* 156 * Thread-synchronous status. 157 * 158 * This is different from the flags in that nobody else 159 * ever touches our thread-synchronous status, so we don't 160 * have to worry about atomic accesses. 161 */ 162 /* FPU was used by this task this quantum (SMP) */ 163 #define TS_USEDFPU 0x0001 164 #define TS_RESTORE_SIGMASK 0x0002 165 166 #ifndef __ASSEMBLY__ 167 #define HAVE_SET_RESTORE_SIGMASK 1 168 static inline void set_restore_sigmask(void) 169 { 170 struct thread_info *ti = current_thread_info(); 171 ti->status |= TS_RESTORE_SIGMASK; 172 set_bit(TIF_SIGPENDING, (unsigned long *)&ti->flags); 173 } 174 #endif 175 176 #endif /* __KERNEL__ */ 177 #endif /* _ASM_MICROBLAZE_THREAD_INFO_H */ 178