| 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 | static 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_FIXADE 20 /* Fix address errors in software */ |
| 113 | #define TIF_LOGADE 21 /* Log address errors to syslog */ |
| 114 | #define TIF_32BIT_REGS 22 /* also implies 16/32 fprs */ |
| 115 | #define TIF_32BIT_ADDR 23 /* 32-bit address space (o32/n32) */ |
| 116 | #define TIF_FPUBOUND 24 /* thread bound to FPU-full CPU set */ |
| 117 | #define TIF_LOAD_WATCH 25 /* If set, load watch registers */ |
| 118 | #define TIF_SYSCALL_TRACE 31 /* syscall trace active */ |
| 119 | |
| 120 | #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) |
| 121 | #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) |
| 122 | #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) |
| 123 | #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) |
| 124 | #define _TIF_SECCOMP (1<<TIF_SECCOMP) |
| 125 | #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) |
| 126 | #define _TIF_USEDFPU (1<<TIF_USEDFPU) |
| 127 | #define _TIF_FIXADE (1<<TIF_FIXADE) |
| 128 | #define _TIF_LOGADE (1<<TIF_LOGADE) |
| 129 | #define _TIF_32BIT_REGS (1<<TIF_32BIT_REGS) |
| 130 | #define _TIF_32BIT_ADDR (1<<TIF_32BIT_ADDR) |
| 131 | #define _TIF_FPUBOUND (1<<TIF_FPUBOUND) |
| 132 | #define _TIF_LOAD_WATCH (1<<TIF_LOAD_WATCH) |
| 133 | |
| 134 | #define _TIF_WORK_SYSCALL_ENTRY (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SECCOMP) |
| 135 | |
| 136 | /* work to do in syscall_trace_leave() */ |
| 137 | #define _TIF_WORK_SYSCALL_EXIT (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT) |
| 138 | |
| 139 | /* work to do on interrupt/exception return */ |
| 140 | #define _TIF_WORK_MASK \ |
| 141 | (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_NOTIFY_RESUME) |
| 142 | /* work to do on any return to u-space */ |
| 143 | #define _TIF_ALLWORK_MASK (_TIF_WORK_MASK | _TIF_WORK_SYSCALL_EXIT) |
| 144 | |
| 145 | #endif /* __KERNEL__ */ |
| 146 | |
| 147 | #endif /* _ASM_THREAD_INFO_H */ |