1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright (C) 2006 Atmark Techno, Inc. 4 */ 5 6 #ifndef _ASM_MICROBLAZE_THREAD_INFO_H 7 #define _ASM_MICROBLAZE_THREAD_INFO_H 8 9 #ifdef __KERNEL__ 10 11 /* we have 8k stack */ 12 #define THREAD_SHIFT 13 13 #define THREAD_SIZE (1 << THREAD_SHIFT) 14 #define THREAD_SIZE_ORDER 1 15 16 #ifndef __ASSEMBLY__ 17 # include <linux/types.h> 18 # include <asm/processor.h> 19 20 /* 21 * low level task data that entry.S needs immediate access to 22 * - this struct should fit entirely inside of one cache line 23 * - this struct shares the supervisor stack pages 24 * - if the contents of this structure are changed, the assembly constants 25 * must also be changed 26 */ 27 28 struct cpu_context { 29 __u32 r1; /* stack pointer */ 30 __u32 r2; 31 /* dedicated registers */ 32 __u32 r13; 33 __u32 r14; 34 __u32 r15; 35 __u32 r16; 36 __u32 r17; 37 __u32 r18; 38 /* non-volatile registers */ 39 __u32 r19; 40 __u32 r20; 41 __u32 r21; 42 __u32 r22; 43 __u32 r23; 44 __u32 r24; 45 __u32 r25; 46 __u32 r26; 47 __u32 r27; 48 __u32 r28; 49 __u32 r29; 50 __u32 r30; 51 /* r31 is used as current task pointer */ 52 /* special purpose registers */ 53 __u32 msr; 54 __u32 ear; 55 __u32 esr; 56 __u32 fsr; 57 }; 58 59 typedef struct { 60 unsigned long seg; 61 } mm_segment_t; 62 63 struct thread_info { 64 struct task_struct *task; /* main task structure */ 65 unsigned long flags; /* low level flags */ 66 unsigned long status; /* thread-synchronous flags */ 67 __u32 cpu; /* current CPU */ 68 __s32 preempt_count; /* 0 => preemptable,< 0 => BUG*/ 69 mm_segment_t addr_limit; /* thread address space */ 70 71 struct cpu_context cpu_context; 72 }; 73 74 /* 75 * macros/functions for gaining access to the thread information structure 76 */ 77 #define INIT_THREAD_INFO(tsk) \ 78 { \ 79 .task = &tsk, \ 80 .flags = 0, \ 81 .cpu = 0, \ 82 .preempt_count = INIT_PREEMPT_COUNT, \ 83 .addr_limit = KERNEL_DS, \ 84 } 85 86 /* how to get the thread information struct from C */ 87 static inline struct thread_info *current_thread_info(void) 88 { 89 register unsigned long sp asm("r1"); 90 91 return (struct thread_info *)(sp & ~(THREAD_SIZE-1)); 92 } 93 94 /* thread information allocation */ 95 #endif /* __ASSEMBLY__ */ 96 97 /* 98 * thread information flags 99 * - these are process state flags that various assembly files may 100 * need to access 101 * - pending work-to-be-done flags are in LSW 102 * - other flags in MSW 103 */ 104 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 105 #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ 106 #define TIF_SIGPENDING 2 /* signal pending */ 107 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ 108 /* restore singlestep on return to user mode */ 109 #define TIF_SINGLESTEP 4 110 #define TIF_MEMDIE 6 /* is terminating due to OOM killer */ 111 #define TIF_SYSCALL_AUDIT 9 /* syscall auditing active */ 112 #define TIF_SECCOMP 10 /* secure computing */ 113 114 /* true if poll_idle() is polling TIF_NEED_RESCHED */ 115 #define TIF_POLLING_NRFLAG 16 116 117 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) 118 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) 119 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) 120 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) 121 #define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP) 122 #define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG) 123 #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) 124 #define _TIF_SECCOMP (1 << TIF_SECCOMP) 125 126 /* work to do in syscall trace */ 127 #define _TIF_WORK_SYSCALL_MASK (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \ 128 _TIF_SYSCALL_AUDIT | _TIF_SECCOMP) 129 130 /* work to do on interrupt/exception return */ 131 #define _TIF_WORK_MASK 0x0000FFFE 132 133 /* work to do on any return to u-space */ 134 #define _TIF_ALLWORK_MASK 0x0000FFFF 135 136 /* 137 * Thread-synchronous status. 138 * 139 * This is different from the flags in that nobody else 140 * ever touches our thread-synchronous status, so we don't 141 * have to worry about atomic accesses. 142 */ 143 /* FPU was used by this task this quantum (SMP) */ 144 #define TS_USEDFPU 0x0001 145 146 #endif /* __KERNEL__ */ 147 #endif /* _ASM_MICROBLAZE_THREAD_INFO_H */ 148