Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * include/asm-v850/thread_info.h -- v850 low-level thread information |
| 3 | * |
| 4 | * Copyright (C) 2002 NEC Corporation |
| 5 | * Copyright (C) 2002 Miles Bader <miles@gnu.org> |
| 6 | * Copyright (C) 2002 David Howells (dhowells@redhat.com) |
| 7 | * - Incorporating suggestions made by Linus Torvalds and Dave Miller |
| 8 | * |
| 9 | * This file is subject to the terms and conditions of the GNU General |
| 10 | * Public License. See the file COPYING in the main directory of this |
| 11 | * archive for more details. |
| 12 | * |
| 13 | * This file was derived from the PPC version, include/asm-ppc/thread_info.h |
| 14 | * which was adapted from the i386 version by Paul Mackerras |
| 15 | */ |
| 16 | |
| 17 | #ifndef __V850_THREAD_INFO_H__ |
| 18 | #define __V850_THREAD_INFO_H__ |
| 19 | |
| 20 | #ifdef __KERNEL__ |
| 21 | |
| 22 | #ifndef __ASSEMBLY__ |
| 23 | |
| 24 | /* |
| 25 | * low level task data. |
| 26 | * If you change this, change the TI_* offsets below to match. |
| 27 | */ |
| 28 | struct thread_info { |
| 29 | struct task_struct *task; /* main task structure */ |
| 30 | struct exec_domain *exec_domain; /* execution domain */ |
| 31 | unsigned long flags; /* low level flags */ |
| 32 | int cpu; /* cpu we're on */ |
| 33 | int preempt_count; |
| 34 | struct restart_block restart_block; |
| 35 | }; |
| 36 | |
| 37 | #define INIT_THREAD_INFO(tsk) \ |
| 38 | { \ |
| 39 | .task = &tsk, \ |
| 40 | .exec_domain = &default_exec_domain, \ |
| 41 | .flags = 0, \ |
| 42 | .cpu = 0, \ |
| 43 | .preempt_count = 1, \ |
| 44 | .restart_block = { \ |
| 45 | .fn = do_no_restart_syscall, \ |
| 46 | }, \ |
| 47 | } |
| 48 | |
| 49 | #define init_thread_info (init_thread_union.thread_info) |
| 50 | #define init_stack (init_thread_union.stack) |
| 51 | |
| 52 | /* |
| 53 | * macros/functions for gaining access to the thread information structure |
| 54 | */ |
| 55 | |
| 56 | /* thread information allocation */ |
| 57 | #define alloc_thread_info(tsk) ((struct thread_info *) \ |
| 58 | __get_free_pages(GFP_KERNEL, 1)) |
| 59 | #define free_thread_info(ti) free_pages((unsigned long) (ti), 1) |
| 60 | #define get_thread_info(ti) get_task_struct((ti)->task) |
| 61 | #define put_thread_info(ti) put_task_struct((ti)->task) |
| 62 | |
| 63 | #endif /* __ASSEMBLY__ */ |
| 64 | |
| 65 | |
| 66 | /* |
| 67 | * Offsets in thread_info structure, used in assembly code |
| 68 | */ |
| 69 | #define TI_TASK 0 |
| 70 | #define TI_EXECDOMAIN 4 |
| 71 | #define TI_FLAGS 8 |
| 72 | #define TI_CPU 12 |
| 73 | #define TI_PREEMPT 16 |
| 74 | |
| 75 | #define PREEMPT_ACTIVE 0x4000000 |
| 76 | |
| 77 | /* |
| 78 | * thread information flag bit numbers |
| 79 | */ |
| 80 | #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ |
| 81 | #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ |
| 82 | #define TIF_SIGPENDING 2 /* signal pending */ |
| 83 | #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ |
| 84 | #define TIF_POLLING_NRFLAG 4 /* true if poll_idle() is polling |
| 85 | TIF_NEED_RESCHED */ |
| 86 | #define TIF_MEMDIE 5 |
| 87 | |
| 88 | /* as above, but as bit values */ |
| 89 | #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) |
| 90 | #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) |
| 91 | #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) |
| 92 | #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) |
| 93 | #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) |
| 94 | |
| 95 | |
| 96 | /* Size of kernel stack for each process. */ |
| 97 | #define THREAD_SIZE 0x2000 |
| 98 | |
| 99 | /* The alignment of kernel threads, with thread_info structures at their |
| 100 | base. Thus, a pointer for a task's task structure can be derived from |
| 101 | its kernel stack pointer. */ |
| 102 | #define THREAD_ALIGNMENT THREAD_SIZE |
| 103 | #define THREAD_MASK (-THREAD_ALIGNMENT) |
| 104 | |
| 105 | |
| 106 | #ifdef __ASSEMBLY__ |
| 107 | |
| 108 | /* Put a pointer to the current thread_info structure into REG. Note that |
| 109 | this definition requires THREAD_MASK to be representable as a signed |
| 110 | 16-bit value. */ |
| 111 | #define GET_CURRENT_THREAD(reg) \ |
| 112 | /* Use `addi' and then `and' instead of just `andi', because \ |
| 113 | `addi' sign-extends the immediate value, whereas `andi' \ |
| 114 | zero-extends it. */ \ |
| 115 | addi THREAD_MASK, r0, reg; \ |
| 116 | and sp, reg |
| 117 | |
| 118 | #else |
| 119 | |
| 120 | /* Return a pointer to the current thread_info structure. */ |
| 121 | static inline struct thread_info *current_thread_info (void) |
| 122 | { |
| 123 | register unsigned long sp __asm__ ("sp"); |
| 124 | return (struct thread_info *)(sp & THREAD_MASK); |
| 125 | } |
| 126 | |
| 127 | #endif /* __ASSEMBLY__ */ |
| 128 | |
| 129 | |
| 130 | #endif /* __KERNEL__ */ |
| 131 | |
| 132 | #endif /* __V850_THREAD_INFO_H__ */ |