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; /* thread address space: 33 0-0xBFFFFFFF for user-thead 34 0-0xFFFFFFFF for kernel-thread 35 */ 36 struct restart_block restart_block; 37 struct pt_regs *regs; 38}; 39 40/* 41 * macros/functions for gaining access to the thread information structure 42 */ 43#define INIT_THREAD_INFO(tsk) \ 44{ \ 45 .task = &tsk, \ 46 .exec_domain = &default_exec_domain, \ 47 .flags = _TIF_FIXADE, \ 48 .cpu = 0, \ 49 .preempt_count = INIT_PREEMPT_COUNT, \ 50 .addr_limit = KERNEL_DS, \ 51 .restart_block = { \ 52 .fn = do_no_restart_syscall, \ 53 }, \ 54} 55 56#define init_thread_info (init_thread_union.thread_info) 57#define init_stack (init_thread_union.stack) 58 59/* How to get the thread information struct from C. */ 60register struct thread_info *__current_thread_info __asm__("$28"); 61#define current_thread_info() __current_thread_info 62 63/* thread information allocation */ 64#if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_32BIT) 65#define THREAD_SIZE_ORDER (1) 66#endif 67#if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_64BIT) 68#define THREAD_SIZE_ORDER (2) 69#endif 70#ifdef CONFIG_PAGE_SIZE_8KB 71#define THREAD_SIZE_ORDER (1) 72#endif 73#ifdef CONFIG_PAGE_SIZE_16KB 74#define THREAD_SIZE_ORDER (0) 75#endif 76#ifdef CONFIG_PAGE_SIZE_32KB 77#define THREAD_SIZE_ORDER (0) 78#endif 79#ifdef CONFIG_PAGE_SIZE_64KB 80#define THREAD_SIZE_ORDER (0) 81#endif 82 83#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER) 84#define THREAD_MASK (THREAD_SIZE - 1UL) 85 86#define __HAVE_ARCH_THREAD_INFO_ALLOCATOR 87 88#ifdef CONFIG_DEBUG_STACK_USAGE 89#define alloc_thread_info(tsk) kzalloc(THREAD_SIZE, GFP_KERNEL) 90#else 91#define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL) 92#endif 93 94#define free_thread_info(info) kfree(info) 95 96#endif /* !__ASSEMBLY__ */ 97 98#define PREEMPT_ACTIVE 0x10000000 99 100/* 101 * thread information flags 102 * - these are process state flags that various assembly files may need to 103 * access 104 * - pending work-to-be-done flags are in LSW 105 * - other flags in MSW 106 */ 107#define TIF_SIGPENDING 1 /* signal pending */ 108#define TIF_NEED_RESCHED 2 /* rescheduling necessary */ 109#define TIF_SYSCALL_AUDIT 3 /* syscall auditing active */ 110#define TIF_SECCOMP 4 /* secure computing */ 111#define TIF_NOTIFY_RESUME 5 /* callback before returning to user */ 112#define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */ 113#define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */ 114#define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */ 115#define TIF_MEMDIE 18 /* is terminating due to OOM killer */ 116#define TIF_FREEZE 19 117#define TIF_FIXADE 20 /* Fix address errors in software */ 118#define TIF_LOGADE 21 /* Log address errors to syslog */ 119#define TIF_32BIT_REGS 22 /* also implies 16/32 fprs */ 120#define TIF_32BIT_ADDR 23 /* 32-bit address space (o32/n32) */ 121#define TIF_FPUBOUND 24 /* thread bound to FPU-full CPU set */ 122#define TIF_LOAD_WATCH 25 /* If set, load watch registers */ 123#define TIF_SYSCALL_TRACE 31 /* syscall trace active */ 124 125#ifdef CONFIG_MIPS32_O32 126#define TIF_32BIT TIF_32BIT_REGS 127#elif defined(CONFIG_MIPS32_N32) 128#define TIF_32BIT _TIF_32BIT_ADDR 129#endif /* CONFIG_MIPS32_O32 */ 130 131#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 132#define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 133#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 134#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) 135#define _TIF_SECCOMP (1<<TIF_SECCOMP) 136#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 137#define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK) 138#define _TIF_USEDFPU (1<<TIF_USEDFPU) 139#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) 140#define _TIF_FREEZE (1<<TIF_FREEZE) 141#define _TIF_FIXADE (1<<TIF_FIXADE) 142#define _TIF_LOGADE (1<<TIF_LOGADE) 143#define _TIF_32BIT_REGS (1<<TIF_32BIT_REGS) 144#define _TIF_32BIT_ADDR (1<<TIF_32BIT_ADDR) 145#define _TIF_FPUBOUND (1<<TIF_FPUBOUND) 146#define _TIF_LOAD_WATCH (1<<TIF_LOAD_WATCH) 147 148/* work to do on interrupt/exception return */ 149#define _TIF_WORK_MASK (0x0000ffef & \ 150 ~(_TIF_SECCOMP | _TIF_SYSCALL_AUDIT)) 151/* work to do on any return to u-space */ 152#define _TIF_ALLWORK_MASK (0x8000ffff & ~_TIF_SECCOMP) 153 154#endif /* __KERNEL__ */ 155 156#endif /* _ASM_THREAD_INFO_H */ 157