| /* SPDX-License-Identifier: GPL-2.0 */ |
| /* |
| * thread_info.h: LoongArch low-level thread information |
| * |
| * Copyright (C) 2020-2022 Loongson Technology Corporation Limited |
| */ |
| |
| #ifndef _ASM_THREAD_INFO_H |
| #define _ASM_THREAD_INFO_H |
| |
| #ifdef __KERNEL__ |
| |
| #ifndef __ASSEMBLY__ |
| |
| #include <asm/processor.h> |
| |
| /* |
| * 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 |
| */ |
| struct thread_info { |
| struct task_struct *task; /* main task structure */ |
| unsigned long flags; /* low level flags */ |
| unsigned long tp_value; /* thread pointer */ |
| __u32 cpu; /* current CPU */ |
| int preempt_count; /* 0 => preemptible, <0 => BUG */ |
| struct pt_regs *regs; |
| unsigned long syscall; /* syscall number */ |
| unsigned long syscall_work; /* SYSCALL_WORK_ flags */ |
| }; |
| |
| /* |
| * macros/functions for gaining access to the thread information structure |
| */ |
| #define INIT_THREAD_INFO(tsk) \ |
| { \ |
| .task = &tsk, \ |
| .flags = _TIF_FIXADE, \ |
| .cpu = 0, \ |
| .preempt_count = INIT_PREEMPT_COUNT, \ |
| } |
| |
| /* How to get the thread information struct from C. */ |
| register struct thread_info *__current_thread_info __asm__("$tp"); |
| |
| static inline struct thread_info *current_thread_info(void) |
| { |
| return __current_thread_info; |
| } |
| |
| register unsigned long current_stack_pointer __asm__("$sp"); |
| |
| #endif /* !__ASSEMBLY__ */ |
| |
| /* thread information allocation */ |
| #define THREAD_SIZE SZ_16K |
| #define THREAD_MASK (THREAD_SIZE - 1UL) |
| #define THREAD_SIZE_ORDER ilog2(THREAD_SIZE / PAGE_SIZE) |
| /* |
| * 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_SIGPENDING 1 /* signal pending */ |
| #define TIF_NEED_RESCHED 2 /* rescheduling necessary */ |
| #define TIF_NOTIFY_RESUME 3 /* callback before returning to user */ |
| #define TIF_NOTIFY_SIGNAL 4 /* signal notifications exist */ |
| #define TIF_RESTORE_SIGMASK 5 /* restore signal mask in do_signal() */ |
| #define TIF_NOHZ 6 /* in adaptive nohz mode */ |
| #define TIF_UPROBE 7 /* breakpointed or singlestepping */ |
| #define TIF_USEDFPU 8 /* FPU was used by this task this quantum (SMP) */ |
| #define TIF_USEDSIMD 9 /* SIMD has been used this quantum */ |
| #define TIF_MEMDIE 10 /* is terminating due to OOM killer */ |
| #define TIF_FIXADE 11 /* Fix address errors in software */ |
| #define TIF_LOGADE 12 /* Log address errors to syslog */ |
| #define TIF_32BIT_REGS 13 /* 32-bit general purpose registers */ |
| #define TIF_32BIT_ADDR 14 /* 32-bit address space */ |
| #define TIF_LOAD_WATCH 15 /* If set, load watch registers */ |
| #define TIF_SINGLESTEP 16 /* Single Step */ |
| #define TIF_LSX_CTX_LIVE 17 /* LSX context must be preserved */ |
| #define TIF_LASX_CTX_LIVE 18 /* LASX context must be preserved */ |
| #define TIF_USEDLBT 19 /* LBT was used by this task this quantum (SMP) */ |
| #define TIF_LBT_CTX_LIVE 20 /* LBT context must be preserved */ |
| |
| #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) |
| #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) |
| #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) |
| #define _TIF_NOTIFY_SIGNAL (1<<TIF_NOTIFY_SIGNAL) |
| #define _TIF_NOHZ (1<<TIF_NOHZ) |
| #define _TIF_UPROBE (1<<TIF_UPROBE) |
| #define _TIF_USEDFPU (1<<TIF_USEDFPU) |
| #define _TIF_USEDSIMD (1<<TIF_USEDSIMD) |
| #define _TIF_FIXADE (1<<TIF_FIXADE) |
| #define _TIF_LOGADE (1<<TIF_LOGADE) |
| #define _TIF_32BIT_REGS (1<<TIF_32BIT_REGS) |
| #define _TIF_32BIT_ADDR (1<<TIF_32BIT_ADDR) |
| #define _TIF_LOAD_WATCH (1<<TIF_LOAD_WATCH) |
| #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP) |
| #define _TIF_LSX_CTX_LIVE (1<<TIF_LSX_CTX_LIVE) |
| #define _TIF_LASX_CTX_LIVE (1<<TIF_LASX_CTX_LIVE) |
| #define _TIF_USEDLBT (1<<TIF_USEDLBT) |
| #define _TIF_LBT_CTX_LIVE (1<<TIF_LBT_CTX_LIVE) |
| |
| #endif /* __KERNEL__ */ |
| #endif /* _ASM_THREAD_INFO_H */ |