Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* thread_info.h: MIPS low-level thread information |
| 2 | * |
| 3 | * Copyright (C) 2002 David Howells (dhowells@redhat.com) |
| 4 | * - Incorporating suggestions made by Linus Torvalds and Dave Miller |
| 5 | */ |
| 6 | |
| 7 | #ifndef _ASM_THREAD_INFO_H |
| 8 | #define _ASM_THREAD_INFO_H |
| 9 | |
| 10 | #ifdef __KERNEL__ |
| 11 | |
| 12 | #include <linux/config.h> |
| 13 | |
| 14 | #ifndef __ASSEMBLY__ |
| 15 | |
| 16 | #include <asm/processor.h> |
| 17 | |
| 18 | /* |
| 19 | * low level task data that entry.S needs immediate access to |
| 20 | * - this struct should fit entirely inside of one cache line |
| 21 | * - this struct shares the supervisor stack pages |
| 22 | * - if the contents of this structure are changed, the assembly constants |
| 23 | * must also be changed |
| 24 | */ |
| 25 | struct thread_info { |
| 26 | struct task_struct *task; /* main task structure */ |
| 27 | struct exec_domain *exec_domain; /* execution domain */ |
| 28 | unsigned long flags; /* low level flags */ |
| 29 | __u32 cpu; /* current CPU */ |
Jesper Juhl | dcd497f | 2005-06-23 00:09:07 -0700 | [diff] [blame] | 30 | int preempt_count; /* 0 => preemptable, <0 => BUG */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | |
| 32 | mm_segment_t addr_limit; /* thread address space: |
| 33 | 0-0xBFFFFFFF for user-thead |
| 34 | 0-0xFFFFFFFF for kernel-thread |
| 35 | */ |
| 36 | struct restart_block restart_block; |
| 37 | }; |
| 38 | |
| 39 | /* |
| 40 | * macros/functions for gaining access to the thread information structure |
| 41 | * |
| 42 | * preempt_count needs to be 1 initially, until the scheduler is functional. |
| 43 | */ |
| 44 | #define INIT_THREAD_INFO(tsk) \ |
| 45 | { \ |
| 46 | .task = &tsk, \ |
| 47 | .exec_domain = &default_exec_domain, \ |
| 48 | .flags = 0, \ |
| 49 | .cpu = 0, \ |
| 50 | .preempt_count = 1, \ |
| 51 | .addr_limit = KERNEL_DS, \ |
| 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 | /* How to get the thread information struct from C. */ |
| 61 | register struct thread_info *__current_thread_info __asm__("$28"); |
| 62 | #define current_thread_info() __current_thread_info |
| 63 | |
| 64 | /* thread information allocation */ |
Ralf Baechle | 875d43e | 2005-09-03 15:56:16 -0700 | [diff] [blame] | 65 | #if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_32BIT) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | #define THREAD_SIZE_ORDER (1) |
| 67 | #endif |
Ralf Baechle | 875d43e | 2005-09-03 15:56:16 -0700 | [diff] [blame] | 68 | #if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_64BIT) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | #define THREAD_SIZE_ORDER (2) |
| 70 | #endif |
| 71 | #ifdef CONFIG_PAGE_SIZE_8KB |
| 72 | #define THREAD_SIZE_ORDER (1) |
| 73 | #endif |
| 74 | #ifdef CONFIG_PAGE_SIZE_16KB |
| 75 | #define THREAD_SIZE_ORDER (0) |
| 76 | #endif |
| 77 | #ifdef CONFIG_PAGE_SIZE_64KB |
| 78 | #define THREAD_SIZE_ORDER (0) |
| 79 | #endif |
| 80 | |
| 81 | #define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER) |
| 82 | #define THREAD_MASK (THREAD_SIZE - 1UL) |
| 83 | |
| 84 | #ifdef CONFIG_DEBUG_STACK_USAGE |
| 85 | #define alloc_thread_info(tsk) \ |
| 86 | ({ \ |
| 87 | struct thread_info *ret; \ |
| 88 | \ |
| 89 | ret = kmalloc(THREAD_SIZE, GFP_KERNEL); \ |
| 90 | if (ret) \ |
| 91 | memset(ret, 0, THREAD_SIZE); \ |
| 92 | ret; \ |
| 93 | }) |
| 94 | #else |
| 95 | #define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL) |
| 96 | #endif |
| 97 | |
| 98 | #define free_thread_info(info) kfree(info) |
| 99 | #define get_thread_info(ti) get_task_struct((ti)->task) |
| 100 | #define put_thread_info(ti) put_task_struct((ti)->task) |
| 101 | |
| 102 | #endif /* !__ASSEMBLY__ */ |
| 103 | |
| 104 | #define PREEMPT_ACTIVE 0x10000000 |
| 105 | |
| 106 | /* |
| 107 | * thread information flags |
| 108 | * - these are process state flags that various assembly files may need to |
| 109 | * access |
| 110 | * - pending work-to-be-done flags are in LSW |
| 111 | * - other flags in MSW |
| 112 | */ |
| 113 | #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ |
| 114 | #define TIF_SIGPENDING 2 /* signal pending */ |
| 115 | #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ |
| 116 | #define TIF_SYSCALL_AUDIT 4 /* syscall auditing active */ |
Ralf Baechle | 127c6f6 | 2005-03-18 17:36:42 +0000 | [diff] [blame] | 117 | #define TIF_SECCOMP 5 /* secure computing */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | #define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */ |
| 119 | #define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */ |
| 120 | #define TIF_MEMDIE 18 |
| 121 | #define TIF_SYSCALL_TRACE 31 /* syscall trace active */ |
| 122 | |
| 123 | #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) |
| 124 | #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) |
| 125 | #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) |
| 126 | #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) |
| 127 | #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) |
Ralf Baechle | 127c6f6 | 2005-03-18 17:36:42 +0000 | [diff] [blame] | 128 | #define _TIF_SECCOMP (1<<TIF_SECCOMP) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | #define _TIF_USEDFPU (1<<TIF_USEDFPU) |
| 130 | #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) |
| 131 | |
Ralf Baechle | 127c6f6 | 2005-03-18 17:36:42 +0000 | [diff] [blame] | 132 | /* work to do on interrupt/exception return */ |
| 133 | #define _TIF_WORK_MASK (0x0000ffef & ~_TIF_SECCOMP) |
| 134 | /* work to do on any return to u-space */ |
| 135 | #define _TIF_ALLWORK_MASK (0x8000ffff & ~_TIF_SECCOMP) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | |
| 137 | #endif /* __KERNEL__ */ |
| 138 | |
| 139 | #endif /* _ASM_THREAD_INFO_H */ |