1/* thread_info.h: CRIS 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 * CRIS port by Axis Communications 7 */ 8 9#ifndef _ASM_THREAD_INFO_H 10#define _ASM_THREAD_INFO_H 11 12#ifdef __KERNEL__ 13 14#define __HAVE_ARCH_THREAD_INFO_ALLOCATOR 15 16#ifndef __ASSEMBLY__ 17#include <asm/types.h> 18#include <asm/processor.h> 19#include <arch/thread_info.h> 20#include <asm/segment.h> 21#endif 22 23 24/* 25 * low level task data that entry.S needs immediate access to 26 * - this struct should fit entirely inside of one cache line 27 * - this struct shares the supervisor stack pages 28 * - if the contents of this structure are changed, the assembly constants must also be changed 29 */ 30#ifndef __ASSEMBLY__ 31struct thread_info { 32 struct task_struct *task; /* main task structure */ 33 struct exec_domain *exec_domain; /* execution domain */ 34 unsigned long flags; /* low level flags */ 35 __u32 cpu; /* current CPU */ 36 int preempt_count; /* 0 => preemptable, <0 => BUG */ 37 __u32 tls; /* TLS for this thread */ 38 39 mm_segment_t addr_limit; /* thread address space: 40 0-0xBFFFFFFF for user-thead 41 0-0xFFFFFFFF for kernel-thread 42 */ 43 struct restart_block restart_block; 44 __u8 supervisor_stack[0]; 45}; 46 47#endif 48 49#define PREEMPT_ACTIVE 0x10000000 50 51/* 52 * macros/functions for gaining access to the thread information structure 53 */ 54#ifndef __ASSEMBLY__ 55#define INIT_THREAD_INFO(tsk) \ 56{ \ 57 .task = &tsk, \ 58 .exec_domain = &default_exec_domain, \ 59 .flags = 0, \ 60 .cpu = 0, \ 61 .preempt_count = INIT_PREEMPT_COUNT, \ 62 .addr_limit = KERNEL_DS, \ 63 .restart_block = { \ 64 .fn = do_no_restart_syscall, \ 65 }, \ 66} 67 68#define init_thread_info (init_thread_union.thread_info) 69 70/* thread information allocation */ 71#define alloc_thread_info(tsk) ((struct thread_info *) __get_free_pages(GFP_KERNEL,1)) 72#define free_thread_info(ti) free_pages((unsigned long) (ti), 1) 73 74#endif /* !__ASSEMBLY__ */ 75 76/* 77 * thread information flags 78 * - these are process state flags that various assembly files may need to access 79 * - pending work-to-be-done flags are in LSW 80 * - other flags in MSW 81 */ 82#define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 83#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ 84#define TIF_SIGPENDING 2 /* signal pending */ 85#define TIF_NEED_RESCHED 3 /* rescheduling necessary */ 86#define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */ 87#define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling TIF_NEED_RESCHED */ 88#define TIF_MEMDIE 17 /* is terminating due to OOM killer */ 89#define TIF_FREEZE 18 /* is freezing for suspend */ 90 91#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 92#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 93#define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 94#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 95#define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK) 96#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) 97#define _TIF_FREEZE (1<<TIF_FREEZE) 98 99#define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */ 100#define _TIF_ALLWORK_MASK 0x0000FFFF /* work to do on any return to u-space */ 101 102#endif /* __KERNEL__ */ 103 104#endif /* _ASM_THREAD_INFO_H */ 105