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/* SPDX-License-Identifier: GPL-2.0-or-later */ /* * OpenRISC Linux * * Linux architectural port borrowing liberally from similar works of * others. All original copyrights apply as per the original source * declaration. * * OpenRISC implementation: * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com> * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se> * et al. */ #ifndef _ASM_THREAD_INFO_H #define _ASM_THREAD_INFO_H #ifdef __KERNEL__ #ifndef __ASSEMBLY__ #include <asm/types.h> #include <asm/processor.h> #endif /* THREAD_SIZE is the size of the task_struct/kernel_stack combo. * normally, the stack is found by doing something like p + THREAD_SIZE * in or32, a page is 8192 bytes, which seems like a sane size */ #define THREAD_SIZE_ORDER 0 #define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER) /* * low level task data that entry.S needs immediate access to * - this struct should fit entirely inside of one cache line * - this struct shares the supervisor stack pages * - if the contents of this structure are changed, the assembly constants * must also be changed */ #ifndef __ASSEMBLY__ typedef unsigned long mm_segment_t; struct thread_info { struct task_struct *task; /* main task structure */ unsigned long flags; /* low level flags */ __u32 cpu; /* current CPU */ __s32 preempt_count; /* 0 => preemptable, <0 => BUG */ mm_segment_t addr_limit; /* thread address space: 0-0x7FFFFFFF for user-thead 0-0xFFFFFFFF for kernel-thread */ __u8 supervisor_stack[0]; /* saved context data */ unsigned long ksp; }; #endif /* * macros/functions for gaining access to the thread information structure * * preempt_count needs to be 1 initially, until the scheduler is functional. */ #ifndef __ASSEMBLY__ #define INIT_THREAD_INFO(tsk) \ { \ .task = &tsk, \ .flags = 0, \ .cpu = 0, \ .preempt_count = INIT_PREEMPT_COUNT, \ .addr_limit = KERNEL_DS, \ .ksp = 0, \ } /* how to get the thread information struct from C */ register struct thread_info *current_thread_info_reg asm("r10"); #define current_thread_info() (current_thread_info_reg) #define get_thread_info(ti) get_task_struct((ti)->task) #define put_thread_info(ti) put_task_struct((ti)->task) #endif /* !__ASSEMBLY__ */ /* * thread information flags * these are process state flags that various assembly files may need to * access * - pending work-to-be-done flags are in LSW * - other flags in MSW */ #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ #define TIF_SIGPENDING 2 /* signal pending */ #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ #define TIF_SINGLESTEP 4 /* restore singlestep on return to user * mode */ #define TIF_SYSCALL_TRACEPOINT 8 /* for ftrace syscall instrumentation */ #define TIF_RESTORE_SIGMASK 9 #define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling * TIF_NEED_RESCHED */ #define TIF_MEMDIE 17 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP) #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) /* Work to do when returning from interrupt/exception */ /* For OpenRISC, this is anything in the LSW other than syscall trace */ #define _TIF_WORK_MASK (0xff & ~(_TIF_SYSCALL_TRACE|_TIF_SINGLESTEP)) #endif /* __KERNEL__ */ #endif /* _ASM_THREAD_INFO_H */
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