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 */ 24 struct 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 = _TIF_FIXADE, \ 42 .cpu = 0, \ 43 .preempt_count = INIT_PREEMPT_COUNT, \ 44 } 45 46 /* How to get the thread information struct from C. */ 47 register struct thread_info *__current_thread_info __asm__("$tp"); 48 current_thread_info(void)49static inline struct thread_info *current_thread_info(void) 50 { 51 return __current_thread_info; 52 } 53 54 register unsigned long current_stack_pointer __asm__("$sp"); 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 #define TIF_USEDLBT 19 /* LBT was used by this task this quantum (SMP) */ 88 #define TIF_LBT_CTX_LIVE 20 /* LBT context must be preserved */ 89 #define TIF_PATCH_PENDING 21 /* pending live patching update */ 90 91 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 92 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 93 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 94 #define _TIF_NOTIFY_SIGNAL (1<<TIF_NOTIFY_SIGNAL) 95 #define _TIF_NOHZ (1<<TIF_NOHZ) 96 #define _TIF_UPROBE (1<<TIF_UPROBE) 97 #define _TIF_USEDFPU (1<<TIF_USEDFPU) 98 #define _TIF_USEDSIMD (1<<TIF_USEDSIMD) 99 #define _TIF_FIXADE (1<<TIF_FIXADE) 100 #define _TIF_LOGADE (1<<TIF_LOGADE) 101 #define _TIF_32BIT_REGS (1<<TIF_32BIT_REGS) 102 #define _TIF_32BIT_ADDR (1<<TIF_32BIT_ADDR) 103 #define _TIF_LOAD_WATCH (1<<TIF_LOAD_WATCH) 104 #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP) 105 #define _TIF_LSX_CTX_LIVE (1<<TIF_LSX_CTX_LIVE) 106 #define _TIF_LASX_CTX_LIVE (1<<TIF_LASX_CTX_LIVE) 107 #define _TIF_USEDLBT (1<<TIF_USEDLBT) 108 #define _TIF_LBT_CTX_LIVE (1<<TIF_LBT_CTX_LIVE) 109 #define _TIF_PATCH_PENDING (1<<TIF_PATCH_PENDING) 110 111 #endif /* __KERNEL__ */ 112 #endif /* _ASM_THREAD_INFO_H */ 113