1 /* 2 * OpenRISC Linux 3 * 4 * Linux architectural port borrowing liberally from similar works of 5 * others. All original copyrights apply as per the original source 6 * declaration. 7 * 8 * OpenRISC implementation: 9 * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com> 10 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se> 11 * et al. 12 * 13 * This program is free software; you can redistribute it and/or modify 14 * it under the terms of the GNU General Public License as published by 15 * the Free Software Foundation; either version 2 of the License, or 16 * (at your option) any later version. 17 */ 18 19 #ifndef _ASM_THREAD_INFO_H 20 #define _ASM_THREAD_INFO_H 21 22 #ifdef __KERNEL__ 23 24 #ifndef __ASSEMBLY__ 25 #include <asm/types.h> 26 #include <asm/processor.h> 27 #endif 28 29 30 /* THREAD_SIZE is the size of the task_struct/kernel_stack combo. 31 * normally, the stack is found by doing something like p + THREAD_SIZE 32 * in or32, a page is 8192 bytes, which seems like a sane size 33 */ 34 35 #define THREAD_SIZE_ORDER 0 36 #define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER) 37 38 /* 39 * low level task data that entry.S needs immediate access to 40 * - this struct should fit entirely inside of one cache line 41 * - this struct shares the supervisor stack pages 42 * - if the contents of this structure are changed, the assembly constants 43 * must also be changed 44 */ 45 #ifndef __ASSEMBLY__ 46 47 typedef unsigned long mm_segment_t; 48 49 struct thread_info { 50 struct task_struct *task; /* main task structure */ 51 struct exec_domain *exec_domain; /* execution domain */ 52 unsigned long flags; /* low level flags */ 53 __u32 cpu; /* current CPU */ 54 __s32 preempt_count; /* 0 => preemptable, <0 => BUG */ 55 56 mm_segment_t addr_limit; /* thread address space: 57 0-0x7FFFFFFF for user-thead 58 0-0xFFFFFFFF for kernel-thread 59 */ 60 struct restart_block restart_block; 61 __u8 supervisor_stack[0]; 62 63 /* saved context data */ 64 unsigned long ksp; 65 }; 66 #endif 67 68 /* 69 * macros/functions for gaining access to the thread information structure 70 * 71 * preempt_count needs to be 1 initially, until the scheduler is functional. 72 */ 73 #ifndef __ASSEMBLY__ 74 #define INIT_THREAD_INFO(tsk) \ 75 { \ 76 .task = &tsk, \ 77 .exec_domain = &default_exec_domain, \ 78 .flags = 0, \ 79 .cpu = 0, \ 80 .preempt_count = 1, \ 81 .addr_limit = KERNEL_DS, \ 82 .restart_block = { \ 83 .fn = do_no_restart_syscall, \ 84 }, \ 85 .ksp = 0, \ 86 } 87 88 #define init_thread_info (init_thread_union.thread_info) 89 90 /* how to get the thread information struct from C */ 91 register struct thread_info *current_thread_info_reg asm("r10"); 92 #define current_thread_info() (current_thread_info_reg) 93 94 #define get_thread_info(ti) get_task_struct((ti)->task) 95 #define put_thread_info(ti) put_task_struct((ti)->task) 96 97 #endif /* !__ASSEMBLY__ */ 98 99 /* 100 * thread information flags 101 * these are process state flags that various assembly files may need to 102 * access 103 * - pending work-to-be-done flags are in LSW 104 * - other flags in MSW 105 */ 106 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 107 #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ 108 #define TIF_SIGPENDING 2 /* signal pending */ 109 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ 110 #define TIF_SINGLESTEP 4 /* restore singlestep on return to user 111 * mode 112 */ 113 #define TIF_SYSCALL_TRACEPOINT 8 /* for ftrace syscall instrumentation */ 114 #define TIF_RESTORE_SIGMASK 9 115 #define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling * TIF_NEED_RESCHED 116 */ 117 #define TIF_MEMDIE 17 118 119 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 120 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 121 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 122 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 123 #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP) 124 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) 125 126 127 /* Work to do when returning from interrupt/exception */ 128 /* For OpenRISC, this is anything in the LSW other than syscall trace */ 129 #define _TIF_WORK_MASK (0xff & ~(_TIF_SYSCALL_TRACE|_TIF_SINGLESTEP)) 130 131 #endif /* __KERNEL__ */ 132 133 #endif /* _ASM_THREAD_INFO_H */ 134