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1da177e4 LT |
1 | #ifndef _ALPHA_THREAD_INFO_H |
2 | #define _ALPHA_THREAD_INFO_H | |
3 | ||
4 | #ifdef __KERNEL__ | |
5 | ||
6 | #ifndef __ASSEMBLY__ | |
7 | #include <asm/processor.h> | |
8 | #include <asm/types.h> | |
9 | #include <asm/hwrpb.h> | |
10 | #endif | |
11 | ||
12 | #ifndef __ASSEMBLY__ | |
13 | struct thread_info { | |
14 | struct pcb_struct pcb; /* palcode state */ | |
15 | ||
16 | struct task_struct *task; /* main task structure */ | |
17 | unsigned int flags; /* low level flags */ | |
18 | unsigned int ieee_state; /* see fpu.h */ | |
19 | ||
20 | struct exec_domain *exec_domain; /* execution domain */ | |
21 | mm_segment_t addr_limit; /* thread address space */ | |
22 | unsigned cpu; /* current CPU */ | |
23 | int preempt_count; /* 0 => preemptable, <0 => BUG */ | |
24 | ||
25 | int bpt_nsaved; | |
26 | unsigned long bpt_addr[2]; /* breakpoint handling */ | |
27 | unsigned int bpt_insn[2]; | |
28 | ||
29 | struct restart_block restart_block; | |
30 | }; | |
31 | ||
32 | /* | |
33 | * Macros/functions for gaining access to the thread information structure. | |
34 | */ | |
35 | #define INIT_THREAD_INFO(tsk) \ | |
36 | { \ | |
37 | .task = &tsk, \ | |
38 | .exec_domain = &default_exec_domain, \ | |
39 | .addr_limit = KERNEL_DS, \ | |
40 | .restart_block = { \ | |
41 | .fn = do_no_restart_syscall, \ | |
42 | }, \ | |
43 | } | |
44 | ||
45 | #define init_thread_info (init_thread_union.thread_info) | |
46 | #define init_stack (init_thread_union.stack) | |
47 | ||
48 | /* How to get the thread information struct from C. */ | |
49 | register struct thread_info *__current_thread_info __asm__("$8"); | |
50 | #define current_thread_info() __current_thread_info | |
51 | ||
52 | /* Thread information allocation. */ | |
53 | #define THREAD_SIZE (2*PAGE_SIZE) | |
54 | #define alloc_thread_info(tsk) \ | |
55 | ((struct thread_info *) __get_free_pages(GFP_KERNEL,1)) | |
56 | #define free_thread_info(ti) free_pages((unsigned long) (ti), 1) | |
1da177e4 LT |
57 | |
58 | #endif /* __ASSEMBLY__ */ | |
59 | ||
60 | #define PREEMPT_ACTIVE 0x40000000 | |
61 | ||
62 | /* | |
63 | * Thread information flags: | |
64 | * - these are process state flags and used from assembly | |
65 | * - pending work-to-be-done flags come first to fit in and immediate operand. | |
66 | * | |
67 | * TIF_SYSCALL_TRACE is known to be 0 via blbs. | |
68 | */ | |
69 | #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ | |
70 | #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ | |
71 | #define TIF_SIGPENDING 2 /* signal pending */ | |
72 | #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ | |
73 | #define TIF_POLLING_NRFLAG 4 /* poll_idle is polling NEED_RESCHED */ | |
74 | #define TIF_DIE_IF_KERNEL 5 /* dik recursion lock */ | |
75 | #define TIF_UAC_NOPRINT 6 /* see sysinfo.h */ | |
76 | #define TIF_UAC_NOFIX 7 | |
77 | #define TIF_UAC_SIGBUS 8 | |
78 | #define TIF_MEMDIE 9 | |
79 | ||
80 | #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) | |
81 | #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) | |
82 | #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) | |
83 | #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) | |
84 | #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) | |
85 | ||
86 | /* Work to do on interrupt/exception return. */ | |
87 | #define _TIF_WORK_MASK (_TIF_NOTIFY_RESUME \ | |
88 | | _TIF_SIGPENDING \ | |
89 | | _TIF_NEED_RESCHED) | |
90 | ||
91 | /* Work to do on any return to userspace. */ | |
92 | #define _TIF_ALLWORK_MASK (_TIF_WORK_MASK \ | |
93 | | _TIF_SYSCALL_TRACE) | |
94 | ||
95 | #endif /* __KERNEL__ */ | |
96 | #endif /* _ALPHA_THREAD_INFO_H */ |