root/arch/ia64/include/asm/thread_info.h

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INCLUDED FROM

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Copyright (C) 2002-2003 Hewlett-Packard Co
   4  *      David Mosberger-Tang <davidm@hpl.hp.com>
   5  */
   6 #ifndef _ASM_IA64_THREAD_INFO_H
   7 #define _ASM_IA64_THREAD_INFO_H
   8 
   9 #ifndef ASM_OFFSETS_C
  10 #include <asm/asm-offsets.h>
  11 #endif
  12 #include <asm/processor.h>
  13 #include <asm/ptrace.h>
  14 
  15 #define THREAD_SIZE                     KERNEL_STACK_SIZE
  16 
  17 #ifndef __ASSEMBLY__
  18 
  19 /*
  20  * On IA-64, we want to keep the task structure and kernel stack together, so they can be
  21  * mapped by a single TLB entry and so they can be addressed by the "current" pointer
  22  * without having to do pointer masking.
  23  */
  24 struct thread_info {
  25         struct task_struct *task;       /* XXX not really needed, except for dup_task_struct() */
  26         __u32 flags;                    /* thread_info flags (see TIF_*) */
  27         __u32 cpu;                      /* current CPU */
  28         __u32 last_cpu;                 /* Last CPU thread ran on */
  29         __u32 status;                   /* Thread synchronous flags */
  30         mm_segment_t addr_limit;        /* user-level address space limit */
  31         int preempt_count;              /* 0=premptable, <0=BUG; will also serve as bh-counter */
  32 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
  33         __u64 utime;
  34         __u64 stime;
  35         __u64 gtime;
  36         __u64 hardirq_time;
  37         __u64 softirq_time;
  38         __u64 idle_time;
  39         __u64 ac_stamp;
  40         __u64 ac_leave;
  41         __u64 ac_stime;
  42         __u64 ac_utime;
  43 #endif
  44 };
  45 
  46 #define INIT_THREAD_INFO(tsk)                   \
  47 {                                               \
  48         .task           = &tsk,                 \
  49         .flags          = 0,                    \
  50         .cpu            = 0,                    \
  51         .addr_limit     = KERNEL_DS,            \
  52         .preempt_count  = INIT_PREEMPT_COUNT,   \
  53 }
  54 
  55 #ifndef ASM_OFFSETS_C
  56 /* how to get the thread information struct from C */
  57 #define current_thread_info()   ((struct thread_info *) ((char *) current + IA64_TASK_SIZE))
  58 #define alloc_thread_stack_node(tsk, node)      \
  59                 ((unsigned long *) ((char *) (tsk) + IA64_TASK_SIZE))
  60 #define task_thread_info(tsk)   ((struct thread_info *) ((char *) (tsk) + IA64_TASK_SIZE))
  61 #else
  62 #define current_thread_info()   ((struct thread_info *) 0)
  63 #define alloc_thread_stack_node(tsk, node)      ((unsigned long *) 0)
  64 #define task_thread_info(tsk)   ((struct thread_info *) 0)
  65 #endif
  66 #define free_thread_stack(tsk)  /* nothing */
  67 #define task_stack_page(tsk)    ((void *)(tsk))
  68 
  69 #define __HAVE_THREAD_FUNCTIONS
  70 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
  71 #define setup_thread_stack(p, org)                      \
  72         *task_thread_info(p) = *task_thread_info(org);  \
  73         task_thread_info(p)->ac_stime = 0;              \
  74         task_thread_info(p)->ac_utime = 0;              \
  75         task_thread_info(p)->task = (p);
  76 #else
  77 #define setup_thread_stack(p, org) \
  78         *task_thread_info(p) = *task_thread_info(org); \
  79         task_thread_info(p)->task = (p);
  80 #endif
  81 #define end_of_stack(p) (unsigned long *)((void *)(p) + IA64_RBS_OFFSET)
  82 
  83 #define alloc_task_struct_node(node)                                            \
  84 ({                                                                              \
  85         struct page *page = alloc_pages_node(node, GFP_KERNEL | __GFP_COMP,     \
  86                                              KERNEL_STACK_SIZE_ORDER);          \
  87         struct task_struct *ret = page ? page_address(page) : NULL;             \
  88                                                                                 \
  89         ret;                                                                    \
  90 })
  91 #define free_task_struct(tsk)   free_pages((unsigned long) (tsk), KERNEL_STACK_SIZE_ORDER)
  92 
  93 #endif /* !__ASSEMBLY */
  94 
  95 /*
  96  * thread information flags
  97  * - these are process state flags that various assembly files may need to access
  98  * - pending work-to-be-done flags are in least-significant 16 bits, other flags
  99  *   in top 16 bits
 100  */
 101 #define TIF_SIGPENDING          0       /* signal pending */
 102 #define TIF_NEED_RESCHED        1       /* rescheduling necessary */
 103 #define TIF_SYSCALL_TRACE       2       /* syscall trace active */
 104 #define TIF_SYSCALL_AUDIT       3       /* syscall auditing active */
 105 #define TIF_SINGLESTEP          4       /* restore singlestep on return to user mode */
 106 #define TIF_NOTIFY_RESUME       6       /* resumption notification requested */
 107 #define TIF_MEMDIE              17      /* is terminating due to OOM killer */
 108 #define TIF_MCA_INIT            18      /* this task is processing MCA or INIT */
 109 #define TIF_DB_DISABLED         19      /* debug trap disabled for fsyscall */
 110 #define TIF_RESTORE_RSE         21      /* user RBS is newer than kernel RBS */
 111 #define TIF_POLLING_NRFLAG      22      /* idle is polling for TIF_NEED_RESCHED */
 112 
 113 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
 114 #define _TIF_SYSCALL_AUDIT      (1 << TIF_SYSCALL_AUDIT)
 115 #define _TIF_SINGLESTEP         (1 << TIF_SINGLESTEP)
 116 #define _TIF_SYSCALL_TRACEAUDIT (_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP)
 117 #define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
 118 #define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
 119 #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
 120 #define _TIF_MCA_INIT           (1 << TIF_MCA_INIT)
 121 #define _TIF_DB_DISABLED        (1 << TIF_DB_DISABLED)
 122 #define _TIF_RESTORE_RSE        (1 << TIF_RESTORE_RSE)
 123 #define _TIF_POLLING_NRFLAG     (1 << TIF_POLLING_NRFLAG)
 124 
 125 /* "work to do on user-return" bits */
 126 #define TIF_ALLWORK_MASK        (_TIF_SIGPENDING|_TIF_NOTIFY_RESUME|_TIF_SYSCALL_AUDIT|\
 127                                  _TIF_NEED_RESCHED|_TIF_SYSCALL_TRACE)
 128 /* like TIF_ALLWORK_BITS but sans TIF_SYSCALL_TRACE or TIF_SYSCALL_AUDIT */
 129 #define TIF_WORK_MASK           (TIF_ALLWORK_MASK&~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT))
 130 
 131 #endif /* _ASM_IA64_THREAD_INFO_H */
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