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thread_info.h

/* thread_info.h: MIPS low-level thread information
 *
 * Copyright (C) 2002  David Howells (dhowells@redhat.com)
 * - Incorporating suggestions made by Linus Torvalds and Dave Miller
 */

#ifndef _ASM_THREAD_INFO_H
#define _ASM_THREAD_INFO_H

#ifdef __KERNEL__


#ifndef __ASSEMBLY__

#include <asm/processor.h>

/*
 * low level task data that entry.S needs immediate access to
 * - this struct should fit entirely inside of one cache line
 * - this struct shares the supervisor stack pages
 * - if the contents of this structure are changed, the assembly constants
 *   must also be changed
 */
struct thread_info {
      struct task_struct      *task;            /* main task structure */
      struct exec_domain      *exec_domain;     /* execution domain */
      unsigned long           flags;            /* low level flags */
      unsigned long           tp_value;   /* thread pointer */
      __u32             cpu;        /* current CPU */
      int               preempt_count;    /* 0 => preemptable, <0 => BUG */

      mm_segment_t            addr_limit; /* thread address space:
                                       0-0xBFFFFFFF for user-thead
                                       0-0xFFFFFFFF for kernel-thread
                                    */
      struct restart_block    restart_block;
      struct pt_regs          *regs;
};

/*
 * macros/functions for gaining access to the thread information structure
 *
 * preempt_count needs to be 1 initially, until the scheduler is functional.
 */
#define INIT_THREAD_INFO(tsk)             \
{                                   \
      .task       = &tsk,                 \
      .exec_domain      = &default_exec_domain, \
      .flags            = _TIF_FIXADE,          \
      .cpu        = 0,              \
      .preempt_count    = 1,              \
      .addr_limit = KERNEL_DS,            \
      .restart_block    = {               \
            .fn = do_no_restart_syscall,  \
      },                            \
}

#define init_thread_info      (init_thread_union.thread_info)
#define init_stack            (init_thread_union.stack)

/* How to get the thread information struct from C.  */
register struct thread_info *__current_thread_info __asm__("$28");
#define current_thread_info()  __current_thread_info

/* thread information allocation */
#if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_32BIT)
#define THREAD_SIZE_ORDER (1)
#endif
#if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_64BIT)
#define THREAD_SIZE_ORDER (2)
#endif
#ifdef CONFIG_PAGE_SIZE_8KB
#define THREAD_SIZE_ORDER (1)
#endif
#ifdef CONFIG_PAGE_SIZE_16KB
#define THREAD_SIZE_ORDER (0)
#endif
#ifdef CONFIG_PAGE_SIZE_64KB
#define THREAD_SIZE_ORDER (0)
#endif

#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
#define THREAD_MASK (THREAD_SIZE - 1UL)

#define __HAVE_ARCH_THREAD_INFO_ALLOCATOR

#ifdef CONFIG_DEBUG_STACK_USAGE
#define alloc_thread_info(tsk)                              \
({                                              \
      struct thread_info *ret;                        \
                                                \
      ret = kzalloc(THREAD_SIZE, GFP_KERNEL);               \
                                                \
      ret;                                      \
})
#else
#define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL)
#endif

#define free_thread_info(info) kfree(info)

#endif /* !__ASSEMBLY__ */

#define PREEMPT_ACTIVE        0x10000000

/*
 * thread information flags
 * - these are process state flags that various assembly files may need to
 *   access
 * - pending work-to-be-done flags are in LSW
 * - other flags in MSW
 */
#define TIF_SIGPENDING        1     /* signal pending */
#define TIF_NEED_RESCHED      2     /* rescheduling necessary */
#define TIF_SYSCALL_AUDIT     3     /* syscall auditing active */
#define TIF_SECCOMP           4     /* secure computing */
#define TIF_RESTORE_SIGMASK   9     /* restore signal mask in do_signal() */
#define TIF_USEDFPU           16    /* FPU was used by this task this quantum (SMP) */
#define TIF_POLLING_NRFLAG    17    /* true if poll_idle() is polling TIF_NEED_RESCHED */
#define TIF_MEMDIE            18
#define TIF_FREEZE            19
#define TIF_FIXADE            20    /* Fix address errors in software */
#define TIF_LOGADE            21    /* Log address errors to syslog */
#define TIF_32BIT_REGS        22    /* also implies 16/32 fprs */
#define TIF_32BIT_ADDR        23    /* 32-bit address space (o32/n32) */
#define TIF_FPUBOUND          24    /* thread bound to FPU-full CPU set */
#define TIF_LOAD_WATCH        25    /* If set, load watch registers */
#define TIF_SYSCALL_TRACE     31    /* syscall trace active */

#define _TIF_SYSCALL_TRACE    (1<<TIF_SYSCALL_TRACE)
#define _TIF_SIGPENDING       (1<<TIF_SIGPENDING)
#define _TIF_NEED_RESCHED     (1<<TIF_NEED_RESCHED)
#define _TIF_SYSCALL_AUDIT    (1<<TIF_SYSCALL_AUDIT)
#define _TIF_SECCOMP          (1<<TIF_SECCOMP)
#define _TIF_RESTORE_SIGMASK  (1<<TIF_RESTORE_SIGMASK)
#define _TIF_USEDFPU          (1<<TIF_USEDFPU)
#define _TIF_POLLING_NRFLAG   (1<<TIF_POLLING_NRFLAG)
#define _TIF_FREEZE           (1<<TIF_FREEZE)
#define _TIF_FIXADE           (1<<TIF_FIXADE)
#define _TIF_LOGADE           (1<<TIF_LOGADE)
#define _TIF_32BIT_REGS       (1<<TIF_32BIT_REGS)
#define _TIF_32BIT_ADDR       (1<<TIF_32BIT_ADDR)
#define _TIF_FPUBOUND         (1<<TIF_FPUBOUND)
#define _TIF_LOAD_WATCH       (1<<TIF_LOAD_WATCH)

/* work to do on interrupt/exception return */
#define _TIF_WORK_MASK        (0x0000ffef & ~_TIF_SECCOMP)
/* work to do on any return to u-space */
#define _TIF_ALLWORK_MASK     (0x8000ffff & ~_TIF_SECCOMP)

#endif /* __KERNEL__ */

#endif /* _ASM_THREAD_INFO_H */

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