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/*
* include/asm-v850/thread_info.h -- v850 low-level thread information
*
* Copyright (C) 2002 NEC Corporation
* Copyright (C) 2002 Miles Bader <miles@gnu.org>
* Copyright (C) 2002 David Howells (dhowells@redhat.com)
* - Incorporating suggestions made by Linus Torvalds and Dave Miller
*
* This file is subject to the terms and conditions of the GNU General
* Public License. See the file COPYING in the main directory of this
* archive for more details.
*
* This file was derived from the PPC version, include/asm-ppc/thread_info.h
* which was adapted from the i386 version by Paul Mackerras
*/
#ifndef __V850_THREAD_INFO_H__
#define __V850_THREAD_INFO_H__
#ifdef __KERNEL__
#ifndef __ASSEMBLY__
/*
* low level task data.
* If you change this, change the TI_* offsets below to match.
*/
struct thread_info {
struct task_struct *task; /* main task structure */
struct exec_domain *exec_domain; /* execution domain */
unsigned long flags; /* low level flags */
int cpu; /* cpu we're on */
int preempt_count; /* 0 => preemptable,
<0 => BUG */
struct restart_block restart_block;
};
#define INIT_THREAD_INFO(tsk) \
{ \
.task = &tsk, \
.exec_domain = &default_exec_domain, \
.flags = 0, \
.cpu = 0, \
.preempt_count = 1, \
.restart_block = { \
.fn = do_no_restart_syscall, \
}, \
}
#define init_thread_info (init_thread_union.thread_info)
#define init_stack (init_thread_union.stack)
/*
* macros/functions for gaining access to the thread information structure
*/
/* thread information allocation */
#define alloc_thread_info(tsk) ((struct thread_info *) \
__get_free_pages(GFP_KERNEL, 1))
#define free_thread_info(ti) free_pages((unsigned long) (ti), 1)
#endif /* __ASSEMBLY__ */
/*
* Offsets in thread_info structure, used in assembly code
*/
#define TI_TASK 0
#define TI_EXECDOMAIN 4
#define TI_FLAGS 8
#define TI_CPU 12
#define TI_PREEMPT 16
#define PREEMPT_ACTIVE 0x4000000
/*
* thread information flag bit numbers
*/
#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
#define TIF_SIGPENDING 1 /* signal pending */
#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
#define TIF_POLLING_NRFLAG 3 /* true if poll_idle() is polling
TIF_NEED_RESCHED */
#define TIF_MEMDIE 4
/* as above, but as bit values */
#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
/* Size of kernel stack for each process. */
#define THREAD_SIZE 0x2000
/* The alignment of kernel threads, with thread_info structures at their
base. Thus, a pointer for a task's task structure can be derived from
its kernel stack pointer. */
#define THREAD_ALIGNMENT THREAD_SIZE
#define THREAD_MASK (-THREAD_ALIGNMENT)
#ifdef __ASSEMBLY__
/* Put a pointer to the current thread_info structure into REG. Note that
this definition requires THREAD_MASK to be representable as a signed
16-bit value. */
#define GET_CURRENT_THREAD(reg) \
/* Use `addi' and then `and' instead of just `andi', because \
`addi' sign-extends the immediate value, whereas `andi' \
zero-extends it. */ \
addi THREAD_MASK, r0, reg; \
and sp, reg
#else
/* Return a pointer to the current thread_info structure. */
static inline struct thread_info *current_thread_info (void)
{
register unsigned long sp __asm__ ("sp");
return (struct thread_info *)(sp & THREAD_MASK);
}
#endif /* __ASSEMBLY__ */
#endif /* __KERNEL__ */
#endif /* __V850_THREAD_INFO_H__ */
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