1/* thread_info.h: MIPS low-level thread information 2 * 3 * Copyright (C) 2002 David Howells (dhowells@redhat.com) 4 * - Incorporating suggestions made by Linus Torvalds and Dave Miller 5 */ 6 7#ifndef _ASM_THREAD_INFO_H 8#define _ASM_THREAD_INFO_H 9 10#ifdef __KERNEL__ 11 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 struct exec_domain *exec_domain; /* execution domain */ 27 unsigned long flags; /* low level flags */ 28 unsigned long tp_value; /* thread pointer */ 29 __u32 cpu; /* current CPU */ 30 int preempt_count; /* 0 => preemptable, <0 => BUG */ 31 32 mm_segment_t addr_limit; /* 33 * thread address space limit: 34 * 0x7fffffff for user-thead 35 * 0xffffffff for kernel-thread 36 */ 37 struct restart_block restart_block; 38 struct pt_regs *regs; 39}; 40 41/* 42 * macros/functions for gaining access to the thread information structure 43 */ 44#define INIT_THREAD_INFO(tsk) \ 45{ \ 46 .task = &tsk, \ 47 .exec_domain = &default_exec_domain, \ 48 .flags = _TIF_FIXADE, \ 49 .cpu = 0, \ 50 .preempt_count = INIT_PREEMPT_COUNT, \ 51 .addr_limit = KERNEL_DS, \ 52 .restart_block = { \ 53 .fn = do_no_restart_syscall, \ 54 }, \ 55} 56 57#define init_thread_info (init_thread_union.thread_info) 58#define init_stack (init_thread_union.stack) 59 60/* How to get the thread information struct from C. */ 61static inline struct thread_info *current_thread_info(void) 62{ 63 register struct thread_info *__current_thread_info __asm__("$28"); 64 65 return __current_thread_info; 66} 67 68#endif /* !__ASSEMBLY__ */ 69 70/* thread information allocation */ 71#if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_32BIT) 72#define THREAD_SIZE_ORDER (1) 73#endif 74#if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_64BIT) 75#define THREAD_SIZE_ORDER (2) 76#endif 77#ifdef CONFIG_PAGE_SIZE_8KB 78#define THREAD_SIZE_ORDER (1) 79#endif 80#ifdef CONFIG_PAGE_SIZE_16KB 81#define THREAD_SIZE_ORDER (0) 82#endif 83#ifdef CONFIG_PAGE_SIZE_32KB 84#define THREAD_SIZE_ORDER (0) 85#endif 86#ifdef CONFIG_PAGE_SIZE_64KB 87#define THREAD_SIZE_ORDER (0) 88#endif 89 90#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER) 91#define THREAD_MASK (THREAD_SIZE - 1UL) 92 93#define STACK_WARN (THREAD_SIZE / 8) 94 95#define PREEMPT_ACTIVE 0x10000000 96 97/* 98 * thread information flags 99 * - these are process state flags that various assembly files may need to 100 * access 101 * - pending work-to-be-done flags are in LSW 102 * - other flags in MSW 103 */ 104#define TIF_SIGPENDING 1 /* signal pending */ 105#define TIF_NEED_RESCHED 2 /* rescheduling necessary */ 106#define TIF_SYSCALL_AUDIT 3 /* syscall auditing active */ 107#define TIF_SECCOMP 4 /* secure computing */ 108#define TIF_NOTIFY_RESUME 5 /* callback before returning to user */ 109#define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */ 110#define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */ 111#define TIF_MEMDIE 18 /* is terminating due to OOM killer */ 112#define TIF_NOHZ 19 /* in adaptive nohz mode */ 113#define TIF_FIXADE 20 /* Fix address errors in software */ 114#define TIF_LOGADE 21 /* Log address errors to syslog */ 115#define TIF_32BIT_REGS 22 /* also implies 16/32 fprs */ 116#define TIF_32BIT_ADDR 23 /* 32-bit address space (o32/n32) */ 117#define TIF_FPUBOUND 24 /* thread bound to FPU-full CPU set */ 118#define TIF_LOAD_WATCH 25 /* If set, load watch registers */ 119#define TIF_SYSCALL_TRACE 31 /* syscall trace active */ 120 121#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 122#define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 123#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 124#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) 125#define _TIF_SECCOMP (1<<TIF_SECCOMP) 126#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 127#define _TIF_USEDFPU (1<<TIF_USEDFPU) 128#define _TIF_NOHZ (1<<TIF_NOHZ) 129#define _TIF_FIXADE (1<<TIF_FIXADE) 130#define _TIF_LOGADE (1<<TIF_LOGADE) 131#define _TIF_32BIT_REGS (1<<TIF_32BIT_REGS) 132#define _TIF_32BIT_ADDR (1<<TIF_32BIT_ADDR) 133#define _TIF_FPUBOUND (1<<TIF_FPUBOUND) 134#define _TIF_LOAD_WATCH (1<<TIF_LOAD_WATCH) 135 136#define _TIF_WORK_SYSCALL_ENTRY (_TIF_NOHZ | _TIF_SYSCALL_TRACE | \ 137 _TIF_SYSCALL_AUDIT) 138 139/* work to do in syscall_trace_leave() */ 140#define _TIF_WORK_SYSCALL_EXIT (_TIF_NOHZ | _TIF_SYSCALL_TRACE | \ 141 _TIF_SYSCALL_AUDIT) 142 143/* work to do on interrupt/exception return */ 144#define _TIF_WORK_MASK \ 145 (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_NOTIFY_RESUME) 146/* work to do on any return to u-space */ 147#define _TIF_ALLWORK_MASK (_TIF_NOHZ | _TIF_WORK_MASK | \ 148 _TIF_WORK_SYSCALL_EXIT) 149 150#endif /* __KERNEL__ */ 151 152#endif /* _ASM_THREAD_INFO_H */ 153