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 */ 24 struct 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. */ 61 register struct thread_info *__current_thread_info __asm__("$28"); 62 #define current_thread_info() __current_thread_info 63 64 #endif /* !__ASSEMBLY__ */ 65 66 /* thread information allocation */ 67 #if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_32BIT) 68 #define THREAD_SIZE_ORDER (1) 69 #endif 70 #if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_64BIT) 71 #define THREAD_SIZE_ORDER (2) 72 #endif 73 #ifdef CONFIG_PAGE_SIZE_8KB 74 #define THREAD_SIZE_ORDER (1) 75 #endif 76 #ifdef CONFIG_PAGE_SIZE_16KB 77 #define THREAD_SIZE_ORDER (0) 78 #endif 79 #ifdef CONFIG_PAGE_SIZE_32KB 80 #define THREAD_SIZE_ORDER (0) 81 #endif 82 #ifdef CONFIG_PAGE_SIZE_64KB 83 #define THREAD_SIZE_ORDER (0) 84 #endif 85 86 #define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER) 87 #define THREAD_MASK (THREAD_SIZE - 1UL) 88 89 #define STACK_WARN (THREAD_SIZE / 8) 90 91 #define PREEMPT_ACTIVE 0x10000000 92 93 /* 94 * thread information flags 95 * - these are process state flags that various assembly files may need to 96 * access 97 * - pending work-to-be-done flags are in LSW 98 * - other flags in MSW 99 */ 100 #define TIF_SIGPENDING 1 /* signal pending */ 101 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */ 102 #define TIF_SYSCALL_AUDIT 3 /* syscall auditing active */ 103 #define TIF_SECCOMP 4 /* secure computing */ 104 #define TIF_NOTIFY_RESUME 5 /* callback before returning to user */ 105 #define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */ 106 #define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */ 107 #define TIF_MEMDIE 18 /* is terminating due to OOM killer */ 108 #define TIF_FIXADE 20 /* Fix address errors in software */ 109 #define TIF_LOGADE 21 /* Log address errors to syslog */ 110 #define TIF_32BIT_REGS 22 /* also implies 16/32 fprs */ 111 #define TIF_32BIT_ADDR 23 /* 32-bit address space (o32/n32) */ 112 #define TIF_FPUBOUND 24 /* thread bound to FPU-full CPU set */ 113 #define TIF_LOAD_WATCH 25 /* If set, load watch registers */ 114 #define TIF_SYSCALL_TRACE 31 /* syscall trace active */ 115 116 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 117 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 118 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 119 #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) 120 #define _TIF_SECCOMP (1<<TIF_SECCOMP) 121 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 122 #define _TIF_USEDFPU (1<<TIF_USEDFPU) 123 #define _TIF_FIXADE (1<<TIF_FIXADE) 124 #define _TIF_LOGADE (1<<TIF_LOGADE) 125 #define _TIF_32BIT_REGS (1<<TIF_32BIT_REGS) 126 #define _TIF_32BIT_ADDR (1<<TIF_32BIT_ADDR) 127 #define _TIF_FPUBOUND (1<<TIF_FPUBOUND) 128 #define _TIF_LOAD_WATCH (1<<TIF_LOAD_WATCH) 129 130 /* work to do in syscall_trace_leave() */ 131 #define _TIF_WORK_SYSCALL_EXIT (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT) 132 133 /* work to do on interrupt/exception return */ 134 #define _TIF_WORK_MASK \ 135 (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_NOTIFY_RESUME) 136 /* work to do on any return to u-space */ 137 #define _TIF_ALLWORK_MASK (_TIF_WORK_MASK | _TIF_WORK_SYSCALL_EXIT) 138 139 #endif /* __KERNEL__ */ 140 141 #endif /* _ASM_THREAD_INFO_H */ 142