thread_info.h (3689B)
1/* SPDX-License-Identifier: GPL-2.0 */ 2/* 3 * thread_info.h: LoongArch low-level thread information 4 * 5 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited 6 */ 7 8#ifndef _ASM_THREAD_INFO_H 9#define _ASM_THREAD_INFO_H 10 11#ifdef __KERNEL__ 12 13#ifndef __ASSEMBLY__ 14 15#include <asm/processor.h> 16 17/* 18 * low level task data that entry.S needs immediate access to 19 * - this struct should fit entirely inside of one cache line 20 * - this struct shares the supervisor stack pages 21 * - if the contents of this structure are changed, the assembly constants 22 * must also be changed 23 */ 24struct thread_info { 25 struct task_struct *task; /* main task structure */ 26 unsigned long flags; /* low level flags */ 27 unsigned long tp_value; /* thread pointer */ 28 __u32 cpu; /* current CPU */ 29 int preempt_count; /* 0 => preemptible, <0 => BUG */ 30 struct pt_regs *regs; 31 unsigned long syscall; /* syscall number */ 32 unsigned long syscall_work; /* SYSCALL_WORK_ flags */ 33}; 34 35/* 36 * macros/functions for gaining access to the thread information structure 37 */ 38#define INIT_THREAD_INFO(tsk) \ 39{ \ 40 .task = &tsk, \ 41 .flags = 0, \ 42 .cpu = 0, \ 43 .preempt_count = INIT_PREEMPT_COUNT, \ 44} 45 46/* How to get the thread information struct from C. */ 47register struct thread_info *__current_thread_info __asm__("$r2"); 48 49static inline struct thread_info *current_thread_info(void) 50{ 51 return __current_thread_info; 52} 53 54register unsigned long current_stack_pointer __asm__("$r3"); 55 56#endif /* !__ASSEMBLY__ */ 57 58/* thread information allocation */ 59#define THREAD_SIZE SZ_16K 60#define THREAD_MASK (THREAD_SIZE - 1UL) 61#define THREAD_SIZE_ORDER ilog2(THREAD_SIZE / PAGE_SIZE) 62/* 63 * thread information flags 64 * - these are process state flags that various assembly files may need to 65 * access 66 * - pending work-to-be-done flags are in LSW 67 * - other flags in MSW 68 */ 69#define TIF_SIGPENDING 1 /* signal pending */ 70#define TIF_NEED_RESCHED 2 /* rescheduling necessary */ 71#define TIF_NOTIFY_RESUME 3 /* callback before returning to user */ 72#define TIF_NOTIFY_SIGNAL 4 /* signal notifications exist */ 73#define TIF_RESTORE_SIGMASK 5 /* restore signal mask in do_signal() */ 74#define TIF_NOHZ 6 /* in adaptive nohz mode */ 75#define TIF_UPROBE 7 /* breakpointed or singlestepping */ 76#define TIF_USEDFPU 8 /* FPU was used by this task this quantum (SMP) */ 77#define TIF_USEDSIMD 9 /* SIMD has been used this quantum */ 78#define TIF_MEMDIE 10 /* is terminating due to OOM killer */ 79#define TIF_FIXADE 11 /* Fix address errors in software */ 80#define TIF_LOGADE 12 /* Log address errors to syslog */ 81#define TIF_32BIT_REGS 13 /* 32-bit general purpose registers */ 82#define TIF_32BIT_ADDR 14 /* 32-bit address space */ 83#define TIF_LOAD_WATCH 15 /* If set, load watch registers */ 84#define TIF_SINGLESTEP 16 /* Single Step */ 85#define TIF_LSX_CTX_LIVE 17 /* LSX context must be preserved */ 86#define TIF_LASX_CTX_LIVE 18 /* LASX context must be preserved */ 87 88#define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 89#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 90#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 91#define _TIF_NOTIFY_SIGNAL (1<<TIF_NOTIFY_SIGNAL) 92#define _TIF_NOHZ (1<<TIF_NOHZ) 93#define _TIF_UPROBE (1<<TIF_UPROBE) 94#define _TIF_USEDFPU (1<<TIF_USEDFPU) 95#define _TIF_USEDSIMD (1<<TIF_USEDSIMD) 96#define _TIF_FIXADE (1<<TIF_FIXADE) 97#define _TIF_LOGADE (1<<TIF_LOGADE) 98#define _TIF_32BIT_REGS (1<<TIF_32BIT_REGS) 99#define _TIF_32BIT_ADDR (1<<TIF_32BIT_ADDR) 100#define _TIF_LOAD_WATCH (1<<TIF_LOAD_WATCH) 101#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP) 102#define _TIF_LSX_CTX_LIVE (1<<TIF_LSX_CTX_LIVE) 103#define _TIF_LASX_CTX_LIVE (1<<TIF_LASX_CTX_LIVE) 104 105#endif /* __KERNEL__ */ 106#endif /* _ASM_THREAD_INFO_H */