1 /* thread_info.h: MIPS low-level thread information 2 * 3 * Copyright (C) 2002 David Howells (dhowells (at) 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; /* 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 * preempt_count needs to be 1 initially, until the scheduler is functional. 44 */ 45 #define INIT_THREAD_INFO(tsk) \ 46 { \ 47 .task = &tsk, \ 48 .exec_domain = &default_exec_domain, \ 49 .flags = _TIF_FIXADE, \ 50 .cpu = 0, \ 51 .preempt_count = 1, \ 52 .addr_limit = KERNEL_DS, \ 53 .restart_block = { \ 54 .fn = do_no_restart_syscall, \ 55 }, \ 56 } 57 58 #define init_thread_info (init_thread_union.thread_info) 59 #define init_stack (init_thread_union.stack) 60 61 /* How to get the thread information struct from C. */ 62 register struct thread_info *__current_thread_info __asm__("$28"); 63 #define current_thread_info() __current_thread_info 64 65 /* thread information allocation */ 66 #if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_32BIT) 67 #define THREAD_SIZE_ORDER (1) 68 #endif 69 #if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_64BIT) 70 #define THREAD_SIZE_ORDER (2) 71 #endif 72 #ifdef CONFIG_PAGE_SIZE_8KB 73 #define THREAD_SIZE_ORDER (1) 74 #endif 75 #ifdef CONFIG_PAGE_SIZE_16KB 76 #define THREAD_SIZE_ORDER (0) 77 #endif 78 #ifdef CONFIG_PAGE_SIZE_64KB 79 #define THREAD_SIZE_ORDER (0) 80 #endif 81 82 #define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER) 83 #define THREAD_MASK (THREAD_SIZE - 1UL) 84 85 #define __HAVE_ARCH_THREAD_INFO_ALLOCATOR 86 87 #ifdef CONFIG_DEBUG_STACK_USAGE 88 #define alloc_thread_info(tsk) \ 89 ({ \ 90 struct thread_info *ret; \ 91 \ 92 ret = kzalloc(THREAD_SIZE, GFP_KERNEL); \ 93 \ 94 ret; \ 95 }) 96 #else 97 #define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL) 98 #endif 99 100 #define free_thread_info(info) kfree(info) 101 102 #endif /* !__ASSEMBLY__ */ 103 104 #define PREEMPT_ACTIVE 0x10000000 105 106 /* 107 * thread information flags 108 * - these are process state flags that various assembly files may need to 109 * access 110 * - pending work-to-be-done flags are in LSW 111 * - other flags in MSW 112 */ 113 #define TIF_SIGPENDING 1 /* signal pending */ 114 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */ 115 #define TIF_SYSCALL_AUDIT 3 /* syscall auditing active */ 116 #define TIF_SECCOMP 4 /* secure computing */ 117 #define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */ 118 #define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */ 119 #define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */ 120 #define TIF_MEMDIE 18 121 #define TIF_FREEZE 19 122 #define TIF_FIXADE 20 /* Fix address errors in software */ 123 #define TIF_LOGADE 21 /* Log address errors to syslog */ 124 #define TIF_32BIT_REGS 22 /* also implies 16/32 fprs */ 125 #define TIF_32BIT_ADDR 23 /* 32-bit address space (o32/n32) */ 126 #define TIF_FPUBOUND 24 /* thread bound to FPU-full CPU set */ 127 #define TIF_SYSCALL_TRACE 31 /* syscall trace active */ 128 129 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 130 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 131 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 132 #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) 133 #define _TIF_SECCOMP (1<<TIF_SECCOMP) 134 #define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK) 135 #define _TIF_USEDFPU (1<<TIF_USEDFPU) 136 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) 137 #define _TIF_FREEZE (1<<TIF_FREEZE) 138 #define _TIF_FIXADE (1<<TIF_FIXADE) 139 #define _TIF_LOGADE (1<<TIF_LOGADE) 140 #define _TIF_32BIT_REGS (1<<TIF_32BIT_REGS) 141 #define _TIF_32BIT_ADDR (1<<TIF_32BIT_ADDR) 142 #define _TIF_FPUBOUND (1<<TIF_FPUBOUND) 143 144 /* work to do on interrupt/exception return */ 145 #define _TIF_WORK_MASK (0x0000ffef & ~_TIF_SECCOMP) 146 /* work to do on any return to u-space */ 147 #define _TIF_ALLWORK_MASK (0x8000ffff & ~_TIF_SECCOMP) 148 149 #endif /* __KERNEL__ */ 150 151 #endif /* _ASM_THREAD_INFO_H */ 152
