| /* 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 */ |