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