100 lines
2.6 KiB
C
100 lines
2.6 KiB
C
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/*
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* Port on Texas Instruments TMS320C6x architecture
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*
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* Copyright (C) 2004, 2009, 2010, 2011 Texas Instruments Incorporated
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* Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
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*
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* Updated for 2.6.3x: Mark Salter <msalter@redhat.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef _ASM_C6X_THREAD_INFO_H
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#define _ASM_C6X_THREAD_INFO_H
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#ifdef __KERNEL__
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#include <asm/page.h>
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#ifdef CONFIG_4KSTACKS
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#define THREAD_SIZE 4096
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#define THREAD_SHIFT 12
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#define THREAD_SIZE_ORDER 0
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#else
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#define THREAD_SIZE 8192
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#define THREAD_SHIFT 13
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#define THREAD_SIZE_ORDER 1
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#endif
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#define THREAD_START_SP (THREAD_SIZE - 8)
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#ifndef __ASSEMBLY__
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typedef struct {
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unsigned long seg;
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} mm_segment_t;
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/*
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* low level task data.
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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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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, <0 = BUG */
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mm_segment_t addr_limit; /* thread address space */
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};
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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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* preempt_count needs to be 1 initially, until the scheduler is functional.
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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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.flags = 0, \
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.cpu = 0, \
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.preempt_count = INIT_PREEMPT_COUNT, \
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.addr_limit = KERNEL_DS, \
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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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/* get the thread information struct of current task */
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static inline __attribute__((const))
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struct thread_info *current_thread_info(void)
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{
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struct thread_info *ti;
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asm volatile (" clr .s2 B15,0,%1,%0\n"
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: "=b" (ti)
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: "Iu5" (THREAD_SHIFT - 1));
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return ti;
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}
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#define get_thread_info(ti) get_task_struct((ti)->task)
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#define put_thread_info(ti) put_task_struct((ti)->task)
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#endif /* __ASSEMBLY__ */
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/*
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* thread information flag bit numbers
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* - pending work-to-be-done flags are in LSW
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* - other flags in MSW
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*/
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#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
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#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */
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#define TIF_SIGPENDING 2 /* signal pending */
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#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
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#define TIF_RESTORE_SIGMASK 4 /* restore signal mask in do_signal() */
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#define TIF_MEMDIE 17 /* OOM killer killed process */
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#define TIF_WORK_MASK 0x00007FFE /* work on irq/exception return */
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#define TIF_ALLWORK_MASK 0x00007FFF /* work on any return to u-space */
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#endif /* __KERNEL__ */
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#endif /* _ASM_C6X_THREAD_INFO_H */
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