LXR linux/arch/xtensa/include/asm/thread

   1/*
   2 * include/asm-xtensa/thread_info.h
   3 *
   4 * This file is subject to the terms and conditions of the GNU General Public
   5 * License.  See the file "COPYING" in the main directory of this archive
   6 * for more details.
   7 *
   8 * Copyright (C) 2001 - 2005 Tensilica Inc.
   9 */
  10
  11#ifndef _XTENSA_THREAD_INFO_H
  12#define _XTENSA_THREAD_INFO_H
  13
  14#include <linux/stringify.h>
  15#include <asm/kmem_layout.h>
  16
  17#define CURRENT_SHIFT KERNEL_STACK_SHIFT
  18
  19#ifndef __ASSEMBLY__
  20# include <asm/processor.h>
  21#endif
  22
  23/*
  24 * low level task data that entry.S needs immediate access to
  25 * - this struct should fit entirely inside of one cache line
  26 * - this struct shares the supervisor stack pages
  27 * - if the contents of this structure are changed, the assembly constants
  28 *   must also be changed
  29 */
  30
  31#ifndef __ASSEMBLY__
  32
  33#if XTENSA_HAVE_COPROCESSORS
  34
  35typedef struct xtregs_coprocessor {
  36        xtregs_cp0_t cp0;
  37        xtregs_cp1_t cp1;
  38        xtregs_cp2_t cp2;
  39        xtregs_cp3_t cp3;
  40        xtregs_cp4_t cp4;
  41        xtregs_cp5_t cp5;
  42        xtregs_cp6_t cp6;
  43        xtregs_cp7_t cp7;
  44} xtregs_coprocessor_t;
  45
  46#endif
  47
  48struct thread_info {
  49        struct task_struct      *task;          /* main task structure */
  50        unsigned long           flags;          /* low level flags */
  51        unsigned long           status;         /* thread-synchronous flags */
  52        __u32                   cpu;            /* current CPU */
  53        __s32                   preempt_count;  /* 0 => preemptable,< 0 => BUG*/
  54
  55        mm_segment_t            addr_limit;     /* thread address space */
  56
  57        unsigned long           cpenable;
  58#if XCHAL_HAVE_EXCLUSIVE
  59        /* result of the most recent exclusive store */
  60        unsigned long           atomctl8;
  61#endif
  62
  63        /* Allocate storage for extra user states and coprocessor states. */
  64#if XTENSA_HAVE_COPROCESSORS
  65        xtregs_coprocessor_t    xtregs_cp;
  66#endif
  67        xtregs_user_t           xtregs_user;
  68};
  69
  70#endif
  71
  72/*
  73 * macros/functions for gaining access to the thread information structure
  74 */
  75
  76#ifndef __ASSEMBLY__
  77
  78#define INIT_THREAD_INFO(tsk)                   \
  79{                                               \
  80        .task           = &tsk,                 \
  81        .flags          = 0,                    \
  82        .cpu            = 0,                    \
  83        .preempt_count  = INIT_PREEMPT_COUNT,   \
  84        .addr_limit     = KERNEL_DS,            \
  85}
  86
  87/* how to get the thread information struct from C */
  88static inline struct thread_info *current_thread_info(void)
  89{
  90        struct thread_info *ti;
  91         __asm__("extui %0, a1, 0, "__stringify(CURRENT_SHIFT)"\n\t"
  92                 "xor %0, a1, %0" : "=&r" (ti) : );
  93        return ti;
  94}
  95
  96#else /* !__ASSEMBLY__ */
  97
  98/* how to get the thread information struct from ASM */
  99#define GET_THREAD_INFO(reg,sp) \
 100        extui reg, sp, 0, CURRENT_SHIFT; \
 101        xor   reg, sp, reg
 102#endif
 103
 104
 105/*
 106 * thread information flags
 107 * - these are process state flags that various assembly files may need to access
 108 */
 109#define TIF_SYSCALL_TRACE       0       /* syscall trace active */
 110#define TIF_SIGPENDING          1       /* signal pending */
 111#define TIF_NEED_RESCHED        2       /* rescheduling necessary */
 112#define TIF_SINGLESTEP          3       /* restore singlestep on return to user mode */
 113#define TIF_SYSCALL_TRACEPOINT  4       /* syscall tracepoint instrumentation */
 114#define TIF_NOTIFY_SIGNAL       5       /* signal notifications exist */
 115#define TIF_RESTORE_SIGMASK     6       /* restore signal mask in do_signal() */
 116#define TIF_NOTIFY_RESUME       7       /* callback before returning to user */
 117#define TIF_DB_DISABLED         8       /* debug trap disabled for syscall */
 118#define TIF_SYSCALL_AUDIT       9       /* syscall auditing active */
 119#define TIF_SECCOMP             10      /* secure computing */
 120#define TIF_MEMDIE              11      /* is terminating due to OOM killer */
 121
 122#define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
 123#define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
 124#define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
 125#define _TIF_SINGLESTEP         (1<<TIF_SINGLESTEP)
 126#define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
 127#define _TIF_NOTIFY_SIGNAL      (1<<TIF_NOTIFY_SIGNAL)
 128#define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
 129#define _TIF_SYSCALL_AUDIT      (1<<TIF_SYSCALL_AUDIT)
 130#define _TIF_SECCOMP            (1<<TIF_SECCOMP)
 131
 132#define _TIF_WORK_MASK          (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
 133                                 _TIF_SYSCALL_TRACEPOINT | \
 134                                 _TIF_SYSCALL_AUDIT | _TIF_SECCOMP)
 135
 136#define THREAD_SIZE KERNEL_STACK_SIZE
 137#define THREAD_SIZE_ORDER (KERNEL_STACK_SHIFT - PAGE_SHIFT)
 138
 139#endif  /* _XTENSA_THREAD_INFO */
 140