Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * include/asm-s390/thread_info.h |
| 3 | * |
| 4 | * S390 version |
| 5 | * Copyright (C) 2002 IBM Deutschland Entwicklung GmbH, IBM Corporation |
| 6 | * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com) |
| 7 | */ |
| 8 | |
| 9 | #ifndef _ASM_THREAD_INFO_H |
| 10 | #define _ASM_THREAD_INFO_H |
| 11 | |
| 12 | #ifdef __KERNEL__ |
| 13 | |
| 14 | /* |
| 15 | * Size of kernel stack for each process |
| 16 | */ |
| 17 | #ifndef __s390x__ |
| 18 | #ifndef __SMALL_STACK |
| 19 | #define THREAD_ORDER 1 |
| 20 | #define ASYNC_ORDER 1 |
| 21 | #else |
| 22 | #define THREAD_ORDER 0 |
| 23 | #define ASYNC_ORDER 0 |
| 24 | #endif |
| 25 | #else /* __s390x__ */ |
| 26 | #ifndef __SMALL_STACK |
| 27 | #define THREAD_ORDER 2 |
| 28 | #define ASYNC_ORDER 2 |
| 29 | #else |
| 30 | #define THREAD_ORDER 1 |
| 31 | #define ASYNC_ORDER 1 |
| 32 | #endif |
| 33 | #endif /* __s390x__ */ |
| 34 | |
| 35 | #define THREAD_SIZE (PAGE_SIZE << THREAD_ORDER) |
| 36 | #define ASYNC_SIZE (PAGE_SIZE << ASYNC_ORDER) |
| 37 | |
| 38 | #ifndef __ASSEMBLY__ |
| 39 | #include <asm/processor.h> |
| 40 | #include <asm/lowcore.h> |
| 41 | |
| 42 | /* |
| 43 | * low level task data that entry.S needs immediate access to |
| 44 | * - this struct should fit entirely inside of one cache line |
| 45 | * - this struct shares the supervisor stack pages |
| 46 | * - if the contents of this structure are changed, the assembly constants must also be changed |
| 47 | */ |
| 48 | struct thread_info { |
| 49 | struct task_struct *task; /* main task structure */ |
| 50 | struct exec_domain *exec_domain; /* execution domain */ |
| 51 | unsigned long flags; /* low level flags */ |
| 52 | unsigned int cpu; /* current CPU */ |
Jesper Juhl | dcd497f | 2005-06-23 00:09:07 -0700 | [diff] [blame] | 53 | int preempt_count; /* 0 => preemptable, <0 => BUG */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | struct restart_block restart_block; |
| 55 | }; |
| 56 | |
| 57 | /* |
| 58 | * macros/functions for gaining access to the thread information structure |
| 59 | */ |
| 60 | #define INIT_THREAD_INFO(tsk) \ |
| 61 | { \ |
| 62 | .task = &tsk, \ |
| 63 | .exec_domain = &default_exec_domain, \ |
| 64 | .flags = 0, \ |
| 65 | .cpu = 0, \ |
| 66 | .restart_block = { \ |
| 67 | .fn = do_no_restart_syscall, \ |
| 68 | }, \ |
| 69 | } |
| 70 | |
| 71 | #define init_thread_info (init_thread_union.thread_info) |
| 72 | #define init_stack (init_thread_union.stack) |
| 73 | |
| 74 | /* how to get the thread information struct from C */ |
| 75 | static inline struct thread_info *current_thread_info(void) |
| 76 | { |
| 77 | return (struct thread_info *)((*(unsigned long *) __LC_KERNEL_STACK)-THREAD_SIZE); |
| 78 | } |
| 79 | |
| 80 | /* thread information allocation */ |
| 81 | #define alloc_thread_info(tsk) ((struct thread_info *) \ |
| 82 | __get_free_pages(GFP_KERNEL,THREAD_ORDER)) |
| 83 | #define free_thread_info(ti) free_pages((unsigned long) (ti),THREAD_ORDER) |
| 84 | #define get_thread_info(ti) get_task_struct((ti)->task) |
| 85 | #define put_thread_info(ti) put_task_struct((ti)->task) |
| 86 | |
| 87 | #endif |
| 88 | |
| 89 | /* |
| 90 | * thread information flags bit numbers |
| 91 | */ |
| 92 | #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ |
| 93 | #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ |
| 94 | #define TIF_SIGPENDING 2 /* signal pending */ |
| 95 | #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ |
| 96 | #define TIF_RESTART_SVC 4 /* restart svc with new svc number */ |
| 97 | #define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */ |
| 98 | #define TIF_SINGLE_STEP 6 /* deliver sigtrap on return to user */ |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 99 | #define TIF_MCCK_PENDING 7 /* machine check handling is pending */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | #define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */ |
| 101 | #define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling |
| 102 | TIF_NEED_RESCHED */ |
| 103 | #define TIF_31BIT 18 /* 32bit process */ |
| 104 | #define TIF_MEMDIE 19 |
| 105 | |
| 106 | #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) |
| 107 | #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) |
| 108 | #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) |
| 109 | #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) |
| 110 | #define _TIF_RESTART_SVC (1<<TIF_RESTART_SVC) |
| 111 | #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) |
| 112 | #define _TIF_SINGLE_STEP (1<<TIF_SINGLE_STEP) |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 113 | #define _TIF_MCCK_PENDING (1<<TIF_MCCK_PENDING) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | #define _TIF_USEDFPU (1<<TIF_USEDFPU) |
| 115 | #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) |
| 116 | #define _TIF_31BIT (1<<TIF_31BIT) |
| 117 | |
| 118 | #endif /* __KERNEL__ */ |
| 119 | |
| 120 | #define PREEMPT_ACTIVE 0x4000000 |
| 121 | |
| 122 | #endif /* _ASM_THREAD_INFO_H */ |