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 #define THREAD_SIZE_ORDER (1) 16 #define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER) 17 18 #ifndef __ASSEMBLY__ 19 20 #include <asm/processor.h> 21 #include <asm/csr.h> 22 23 typedef struct { 24 unsigned long seg; 25 } mm_segment_t; 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 mm_segment_t addr_limit; 39 /* 40 * These stack pointers are overwritten on every system call or 41 * exception. SP is also saved to the stack it can be recovered when 42 * overwritten. 43 */ 44 long kernel_sp; /* Kernel stack pointer */ 45 long user_sp; /* User stack pointer */ 46 int cpu; 47 }; 48 49 /* 50 * macros/functions for gaining access to the thread information structure 51 * 52 * preempt_count needs to be 1 initially, until the scheduler is functional. 53 */ 54 #define INIT_THREAD_INFO(tsk) \ 55 { \ 56 .flags = 0, \ 57 .preempt_count = INIT_PREEMPT_COUNT, \ 58 .addr_limit = KERNEL_DS, \ 59 } 60 61 #endif /* !__ASSEMBLY__ */ 62 63 /* 64 * thread information flags 65 * - these are process state flags that various assembly files may need to 66 * access 67 * - pending work-to-be-done flags are in lowest half-word 68 * - other flags in upper half-word(s) 69 */ 70 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 71 #define TIF_NOTIFY_RESUME 1 /* callback before returning to user */ 72 #define TIF_SIGPENDING 2 /* signal pending */ 73 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ 74 #define TIF_RESTORE_SIGMASK 4 /* restore signal mask in do_signal() */ 75 #define TIF_MEMDIE 5 /* is terminating due to OOM killer */ 76 #define TIF_SYSCALL_TRACEPOINT 6 /* syscall tracepoint instrumentation */ 77 #define TIF_SYSCALL_AUDIT 7 /* syscall auditing */ 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 86 #define _TIF_WORK_MASK \ 87 (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING | _TIF_NEED_RESCHED) 88 89 #define _TIF_SYSCALL_WORK \ 90 (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_TRACEPOINT | _TIF_SYSCALL_AUDIT) 91 92 #endif /* _ASM_RISCV_THREAD_INFO_H */ 93