| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 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 */ |
| 39 | int preempt_count; /* 0 => preemptable, <0 => BUG*/ |
| 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 */ |