1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * OpenRISC Linux 4 * 5 * Linux architectural port borrowing liberally from similar works of 6 * others. All original copyrights apply as per the original source 7 * declaration. 8 * 9 * OpenRISC implementation: 10 * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com> 11 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se> 12 * et al. 13 */ 14 15 #ifndef _ASM_THREAD_INFO_H 16 #define _ASM_THREAD_INFO_H 17 18 #ifdef __KERNEL__ 19 20 #ifndef __ASSEMBLY__ 21 #include <asm/types.h> 22 #include <asm/processor.h> 23 #endif 24 25 26 /* THREAD_SIZE is the size of the task_struct/kernel_stack combo. 27 * normally, the stack is found by doing something like p + THREAD_SIZE 28 * in or32, a page is 8192 bytes, which seems like a sane size 29 */ 30 31 #define THREAD_SIZE_ORDER 0 32 #define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER) 33 34 /* 35 * low level task data that entry.S needs immediate access to 36 * - this struct should fit entirely inside of one cache line 37 * - this struct shares the supervisor stack pages 38 * - if the contents of this structure are changed, the assembly constants 39 * must also be changed 40 */ 41 #ifndef __ASSEMBLY__ 42 43 typedef unsigned long mm_segment_t; 44 45 struct thread_info { 46 struct task_struct *task; /* main task structure */ 47 unsigned long flags; /* low level flags */ 48 __u32 cpu; /* current CPU */ 49 __s32 preempt_count; /* 0 => preemptable, <0 => BUG */ 50 51 mm_segment_t addr_limit; /* thread address space: 52 0-0x7FFFFFFF for user-thead 53 0-0xFFFFFFFF for kernel-thread 54 */ 55 __u8 supervisor_stack[0]; 56 57 /* saved context data */ 58 unsigned long ksp; 59 }; 60 #endif 61 62 /* 63 * macros/functions for gaining access to the thread information structure 64 * 65 * preempt_count needs to be 1 initially, until the scheduler is functional. 66 */ 67 #ifndef __ASSEMBLY__ 68 #define INIT_THREAD_INFO(tsk) \ 69 { \ 70 .task = &tsk, \ 71 .flags = 0, \ 72 .cpu = 0, \ 73 .preempt_count = INIT_PREEMPT_COUNT, \ 74 .addr_limit = KERNEL_DS, \ 75 .ksp = 0, \ 76 } 77 78 /* how to get the thread information struct from C */ 79 register struct thread_info *current_thread_info_reg asm("r10"); 80 #define current_thread_info() (current_thread_info_reg) 81 82 #define get_thread_info(ti) get_task_struct((ti)->task) 83 #define put_thread_info(ti) put_task_struct((ti)->task) 84 85 #endif /* !__ASSEMBLY__ */ 86 87 /* 88 * thread information flags 89 * these are process state flags that various assembly files may need to 90 * access 91 * - pending work-to-be-done flags are in LSW 92 * - other flags in MSW 93 */ 94 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 95 #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ 96 #define TIF_SIGPENDING 2 /* signal pending */ 97 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ 98 #define TIF_SINGLESTEP 4 /* restore singlestep on return to user 99 * mode 100 */ 101 #define TIF_NOTIFY_SIGNAL 5 /* signal notifications exist */ 102 #define TIF_SYSCALL_TRACEPOINT 8 /* for ftrace syscall instrumentation */ 103 #define TIF_RESTORE_SIGMASK 9 104 #define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling * TIF_NEED_RESCHED 105 */ 106 #define TIF_MEMDIE 17 107 108 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 109 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 110 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 111 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 112 #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP) 113 #define _TIF_NOTIFY_SIGNAL (1<<TIF_NOTIFY_SIGNAL) 114 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) 115 116 117 /* Work to do when returning from interrupt/exception */ 118 /* For OpenRISC, this is anything in the LSW other than syscall trace */ 119 #define _TIF_WORK_MASK (0xff & ~(_TIF_SYSCALL_TRACE|_TIF_SINGLESTEP)) 120 121 #endif /* __KERNEL__ */ 122 123 #endif /* _ASM_THREAD_INFO_H */ 124