LXR linux/arch/hexagon/include/asm/thread

   1/*
   2 * Thread support for the Hexagon architecture
   3 *
   4 * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License version 2 and
   8 * only version 2 as published by the Free Software Foundation.
   9 *
  10 * This program is distributed in the hope that it will be useful,
  11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 * GNU General Public License for more details.
  14 *
  15 * You should have received a copy of the GNU General Public License
  16 * along with this program; if not, write to the Free Software
  17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  18 * 02110-1301, USA.
  19 */
  20
  21#ifndef _ASM_THREAD_INFO_H
  22#define _ASM_THREAD_INFO_H
  23
  24#ifdef __KERNEL__
  25
  26#ifndef __ASSEMBLY__
  27#include <asm/processor.h>
  28#include <asm/registers.h>
  29#include <asm/page.h>
  30#endif
  31
  32#define THREAD_SHIFT            12
  33#define THREAD_SIZE             (1<<THREAD_SHIFT)
  34#define THREAD_SIZE_ORDER       (THREAD_SHIFT - PAGE_SHIFT)
  35
  36#ifndef __ASSEMBLY__
  37
  38typedef struct {
  39        unsigned long seg;
  40} mm_segment_t;
  41
  42/*
  43 * This is union'd with the "bottom" of the kernel stack.
  44 * It keeps track of thread info which is handy for routines
  45 * to access quickly.
  46 */
  47
  48struct thread_info {
  49        struct task_struct      *task;          /* main task structure */
  50        struct exec_domain      *exec_domain;   /* execution domain */
  51        unsigned long           flags;          /* low level flags */
  52        __u32                   cpu;            /* current cpu */
  53        int                     preempt_count;  /* 0=>preemptible,<0=>BUG */
  54        mm_segment_t            addr_limit;     /* segmentation sux */
  55        /*
  56         * used for syscalls somehow;
  57         * seems to have a function pointer and four arguments
  58         */
  59        struct restart_block    restart_block;
  60        /* Points to the current pt_regs frame  */
  61        struct pt_regs          *regs;
  62        /*
  63         * saved kernel sp at switch_to time;
  64         * not sure if this is used (it's not in the VM model it seems;
  65         * see thread_struct)
  66         */
  67        unsigned long           sp;
  68};
  69
  70#else /* !__ASSEMBLY__ */
  71
  72#include <asm/asm-offsets.h>
  73
  74#endif  /* __ASSEMBLY__  */
  75
  76/*  looks like "linux/hardirq.h" uses this.  */
  77
  78#define PREEMPT_ACTIVE          0x10000000
  79
  80#ifndef __ASSEMBLY__
  81
  82#define INIT_THREAD_INFO(tsk)                   \
  83{                                               \
  84        .task           = &tsk,                 \
  85        .exec_domain    = &default_exec_domain, \
  86        .flags          = 0,                    \
  87        .cpu            = 0,                    \
  88        .preempt_count  = 1,                    \
  89        .addr_limit     = KERNEL_DS,            \
  90        .restart_block = {                      \
  91                .fn = do_no_restart_syscall,    \
  92        },                                      \
  93        .sp = 0,                                \
  94        .regs = NULL,                   \
  95}
  96
  97#define init_thread_info        (init_thread_union.thread_info)
  98#define init_stack              (init_thread_union.stack)
  99
 100/* Tacky preprocessor trickery */
 101#define qqstr(s) qstr(s)
 102#define qstr(s) #s
 103#define QUOTED_THREADINFO_REG qqstr(THREADINFO_REG)
 104
 105register struct thread_info *__current_thread_info asm(QUOTED_THREADINFO_REG);
 106#define current_thread_info()  __current_thread_info
 107
 108#endif /* __ASSEMBLY__ */
 109
 110/*
 111 * thread information flags
 112 * - these are process state flags that various assembly files
 113 *   may need to access
 114 * - pending work-to-be-done flags are in LSW
 115 * - other flags in MSW
 116 */
 117
 118#define TIF_SYSCALL_TRACE       0       /* syscall trace active */
 119#define TIF_NOTIFY_RESUME       1       /* resumption notification requested */
 120#define TIF_SIGPENDING          2       /* signal pending */
 121#define TIF_NEED_RESCHED        3       /* rescheduling necessary */
 122#define TIF_SINGLESTEP          4       /* restore ss @ return to usr mode */
 123#define TIF_RESTORE_SIGMASK     6       /* restore sig mask in do_signal() */
 124/* true if poll_idle() is polling TIF_NEED_RESCHED */
 125#define TIF_MEMDIE              17      /* OOM killer killed process */
 126
 127#define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
 128#define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
 129#define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
 130#define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
 131#define _TIF_SINGLESTEP         (1 << TIF_SINGLESTEP)
 132
 133/* work to do on interrupt/exception return - All but TIF_SYSCALL_TRACE */
 134#define _TIF_WORK_MASK          (0x0000FFFF & ~_TIF_SYSCALL_TRACE)
 135
 136/* work to do on any return to u-space */
 137#define _TIF_ALLWORK_MASK       0x0000FFFF
 138
 139#endif /* __KERNEL__ */
 140
 141#endif
 142