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 * 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 = 0, \ 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. */ 62register 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#if defined(CONFIG_BCM_ENDPOINTDRV) 68#define THREAD_SIZE_ORDER (2) 69#else 70#define THREAD_SIZE_ORDER (1) 71#endif 72#endif 73#if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_64BIT) 74#define THREAD_SIZE_ORDER (2) 75#endif 76#ifdef CONFIG_PAGE_SIZE_8KB 77#define THREAD_SIZE_ORDER (1) 78#endif 79#ifdef CONFIG_PAGE_SIZE_16KB 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#ifdef CONFIG_DEBUG_STACK_USAGE 90#define alloc_thread_info(tsk) \ 91({ \ 92 struct thread_info *ret; \ 93 \ 94 ret = kmalloc(THREAD_SIZE, GFP_KERNEL); \ 95 if (ret) \ 96 memset(ret, 0, THREAD_SIZE); \ 97 ret; \ 98}) 99#else 100#define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL) 101#endif 102 103#define free_thread_info(info) kfree(info) 104 105#endif /* !__ASSEMBLY__ */ 106 107#define PREEMPT_ACTIVE 0x10000000 108 109/* 110 * thread information flags 111 * - these are process state flags that various assembly files may need to 112 * access 113 * - pending work-to-be-done flags are in LSW 114 * - other flags in MSW 115 */ 116#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ 117#define TIF_SIGPENDING 2 /* signal pending */ 118#define TIF_NEED_RESCHED 3 /* rescheduling necessary */ 119#define TIF_SYSCALL_AUDIT 4 /* syscall auditing active */ 120#define TIF_SECCOMP 5 /* secure computing */ 121#define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */ 122#define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */ 123#define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */ 124#define TIF_MEMDIE 18 125#define TIF_FREEZE 19 126#define TIF_SYSCALL_TRACE 31 /* syscall trace active */ 127 128#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 129#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 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) 138 139/* work to do on interrupt/exception return */ 140#define _TIF_WORK_MASK (0x0000ffef & ~_TIF_SECCOMP) 141/* work to do on any return to u-space */ 142#define _TIF_ALLWORK_MASK (0x8000ffff & ~_TIF_SECCOMP) 143 144#endif /* __KERNEL__ */ 145 146#endif /* _ASM_THREAD_INFO_H */ 147