projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* thread_info.h: m68knommu low-level thread information |
| 2 | * adapted from the i386 and PPC versions by Greg Ungerer (gerg@snapgear.com) | |
| 3 | * | |
| 4 | * Copyright (C) 2002 David Howells (dhowells@redhat.com) | |
| 5 | * - Incorporating suggestions made by Linus Torvalds and Dave Miller | |
| 6 | */ | |
| 7 | ||
| 8 | #ifndef _ASM_THREAD_INFO_H | |
| 9 | #define _ASM_THREAD_INFO_H | |
| 10 | ||
| 11 | #include <asm/page.h> | |
| 12 | ||
| 13 | #ifdef __KERNEL__ | |
| 14 | ||
| 15 | #ifndef __ASSEMBLY__ | |
| 16 | ||
| 17 | /* | |
| 18 | * Size of kernel stack for each process. This must be a power of 2... | |
| 19 | */ | |
| 20 | #ifdef CONFIG_4KSTACKS | |
| 21 | #define THREAD_SIZE_ORDER (0) | |
| 22 | #else | |
| 23 | #define THREAD_SIZE_ORDER (1) | |
| 24 | #endif | |
| 25 | ||
| 26 | /* | |
| 27 | * for asm files, THREAD_SIZE is now generated by asm-offsets.c | |
| 28 | */ | |
| 29 | #define THREAD_SIZE (PAGE_SIZE<<THREAD_SIZE_ORDER) | |
| 30 | ||
| 31 | /* | |
| 32 | * low level task data. | |
| 33 | */ | |
| 34 | struct thread_info { | |
| 35 | struct task_struct *task; /* main task structure */ | |
| 36 | struct exec_domain *exec_domain; /* execution domain */ | |
| 37 | unsigned long flags; /* low level flags */ | |
| 38 | int cpu; /* cpu we're on */ | |
| dcd497f9 | 39 | int preempt_count; /* 0 => preemptable, <0 => BUG */ |
| 1da177e4 LT |
40 | struct restart_block restart_block; |
| 41 | }; | |
| 42 | ||
| 43 | /* | |
| 44 | * macros/functions for gaining access to the thread information structure | |
| 45 | */ | |
| 46 | #define INIT_THREAD_INFO(tsk) \ | |
| 47 | { \ | |
| 48 | .task = &tsk, \ | |
| 49 | .exec_domain = &default_exec_domain, \ | |
| 50 | .flags = 0, \ | |
| 51 | .cpu = 0, \ | |
| 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 | ||
| 61 | /* how to get the thread information struct from C */ | |
| 62 | static inline struct thread_info *current_thread_info(void) | |
| 63 | { | |
| 64 | struct thread_info *ti; | |
| 65 | __asm__( | |
| 66 | "move.l %%sp, %0 \n\t" | |
| 67 | "and.l %1, %0" | |
| 68 | : "=&d"(ti) | |
| 69 | : "di" (~(THREAD_SIZE-1)) | |
| 70 | ); | |
| 71 | return ti; | |
| 72 | } | |
| 73 | ||
| 74 | /* thread information allocation */ | |
| 75 | #define alloc_thread_info(tsk) ((struct thread_info *) \ | |
| 76 | __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER)) | |
| 77 | #define free_thread_info(ti) free_pages((unsigned long) (ti), THREAD_SIZE_ORDER) | |
| 78 | #define get_thread_info(ti) get_task_struct((ti)->task) | |
| 79 | #define put_thread_info(ti) put_task_struct((ti)->task) | |
| 80 | #endif /* __ASSEMBLY__ */ | |
| 81 | ||
| 82 | #define PREEMPT_ACTIVE 0x4000000 | |
| 83 | ||
| 84 | /* | |
| 85 | * thread information flag bit numbers | |
| 86 | */ | |
| 87 | #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ | |
| 88 | #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ | |
| 89 | #define TIF_SIGPENDING 2 /* signal pending */ | |
| 90 | #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ | |
| 91 | #define TIF_POLLING_NRFLAG 4 /* true if poll_idle() is polling | |
| 92 | TIF_NEED_RESCHED */ | |
| 93 | #define TIF_MEMDIE 5 | |
| 94 | ||
| 95 | /* as above, but as bit values */ | |
| 96 | #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) | |
| 97 | #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) | |
| 98 | #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) | |
| 99 | #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) | |
| 100 | #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) | |
| 101 | ||
| 102 | #define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */ | |
| 103 | ||
| 104 | #endif /* __KERNEL__ */ | |
| 105 | ||
| 106 | #endif /* _ASM_THREAD_INFO_H */ |