1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (C) 2009 Chen Liqin <liqin.chen@sunplusct.com> 4 * Copyright (C) 2012 Regents of the University of California 5 * Copyright (C) 2017 SiFive 6 */ 7 8 #ifndef _ASM_RISCV_THREAD_INFO_H 9 #define _ASM_RISCV_THREAD_INFO_H 10 11 #include <asm/page.h> 12 #include <linux/const.h> 13 14 /* thread information allocation */ 15 #ifdef CONFIG_64BIT 16 #define THREAD_SIZE_ORDER (2) 17 #else 18 #define THREAD_SIZE_ORDER (1) 19 #endif 20 #define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER) 21 22 #ifndef __ASSEMBLY__ 23 24 #include <asm/processor.h> 25 #include <asm/csr.h> 26 27 /* 28 * low level task data that entry.S needs immediate access to 29 * - this struct should fit entirely inside of one cache line 30 * - if the members of this struct changes, the assembly constants 31 * in asm-offsets.c must be updated accordingly 32 * - thread_info is included in task_struct at an offset of 0. This means that 33 * tp points to both thread_info and task_struct. 34 */ 35 struct thread_info { 36 unsigned long flags; /* low level flags */ 37 int preempt_count; /* 0=>preemptible, <0=>BUG */ 38 /* 39 * These stack pointers are overwritten on every system call or 40 * exception. SP is also saved to the stack it can be recovered when 41 * overwritten. 42 */ 43 long kernel_sp; /* Kernel stack pointer */ 44 long user_sp; /* User stack pointer */ 45 int cpu; 46 }; 47 48 /* 49 * macros/functions for gaining access to the thread information structure 50 * 51 * preempt_count needs to be 1 initially, until the scheduler is functional. 52 */ 53 #define INIT_THREAD_INFO(tsk) \ 54 { \ 55 .flags = 0, \ 56 .preempt_count = INIT_PREEMPT_COUNT, \ 57 } 58 59 #endif /* !__ASSEMBLY__ */ 60 61 /* 62 * thread information flags 63 * - these are process state flags that various assembly files may need to 64 * access 65 * - pending work-to-be-done flags are in lowest half-word 66 * - other flags in upper half-word(s) 67 */ 68 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 69 #define TIF_NOTIFY_RESUME 1 /* callback before returning to user */ 70 #define TIF_SIGPENDING 2 /* signal pending */ 71 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ 72 #define TIF_RESTORE_SIGMASK 4 /* restore signal mask in do_signal() */ 73 #define TIF_MEMDIE 5 /* is terminating due to OOM killer */ 74 #define TIF_SYSCALL_TRACEPOINT 6 /* syscall tracepoint instrumentation */ 75 #define TIF_SYSCALL_AUDIT 7 /* syscall auditing */ 76 #define TIF_SECCOMP 8 /* syscall secure computing */ 77 #define TIF_NOTIFY_SIGNAL 9 /* signal notifications exist */ 78 79 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) 80 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) 81 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) 82 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) 83 #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT) 84 #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) 85 #define _TIF_SECCOMP (1 << TIF_SECCOMP) 86 #define _TIF_NOTIFY_SIGNAL (1 << TIF_NOTIFY_SIGNAL) 87 88 #define _TIF_WORK_MASK \ 89 (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING | _TIF_NEED_RESCHED | \ 90 _TIF_NOTIFY_SIGNAL) 91 92 #define _TIF_SYSCALL_WORK \ 93 (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_TRACEPOINT | _TIF_SYSCALL_AUDIT | \ 94 _TIF_SECCOMP) 95 96 #endif /* _ASM_RISCV_THREAD_INFO_H */ 97