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/*
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* linux/include/asm-arm/thread_info.h
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*
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* Copyright (C) 2002 Russell King.
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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_ARM_THREAD_INFO_H
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#define __ASM_ARM_THREAD_INFO_H
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#ifdef __KERNEL__
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#include <linux/compiler.h>
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#include <asm/fpstate.h>
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#define THREAD_SIZE_ORDER 1
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#define THREAD_SIZE 8192
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#define THREAD_START_SP (THREAD_SIZE - 8)
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#ifndef __ASSEMBLY__
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struct task_struct;
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struct exec_domain;
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#include <asm/types.h>
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#include <asm/domain.h>
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typedef unsigned long mm_segment_t;
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struct cpu_context_save {
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__u32 r4;
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__u32 r5;
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__u32 r6;
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__u32 r7;
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__u32 r8;
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__u32 r9;
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__u32 sl;
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__u32 fp;
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__u32 sp;
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__u32 pc;
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__u32 extra[2]; /* Xscale 'acc' register, etc */
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};
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/*
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* low level task data that entry.S needs immediate access to.
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* __switch_to() assumes cpu_context follows immediately after cpu_domain.
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*/
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struct thread_info {
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unsigned long flags; /* low level flags */
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int preempt_count; /* 0 => preemptable, <0 => bug */
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mm_segment_t addr_limit; /* address limit */
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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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__u32 cpu; /* cpu */
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__u32 cpu_domain; /* cpu domain */
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struct cpu_context_save cpu_context; /* cpu context */
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__u32 syscall; /* syscall number */
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__u8 used_cp[16]; /* thread used copro */
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unsigned long tp_value;
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struct crunch_state crunchstate;
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union fp_state fpstate __attribute__((aligned(8)));
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union vfp_state vfpstate;
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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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.preempt_count = 1, \
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.addr_limit = KERNEL_DS, \
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.cpu_domain = domain_val(DOMAIN_USER, DOMAIN_MANAGER) | \
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domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) | \
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domain_val(DOMAIN_IO, DOMAIN_CLIENT), \
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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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* how to get the thread information struct from C
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*/
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static inline struct thread_info *current_thread_info(void) __attribute_const__;
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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_SIZE - 1));
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}
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/* thread information allocation */
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#ifdef CONFIG_DEBUG_STACK_USAGE
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#define alloc_thread_info(tsk) \
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((struct thread_info *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, \
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THREAD_SIZE_ORDER))
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#else
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#define alloc_thread_info(tsk) \
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((struct thread_info *)__get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER))
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#endif
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#define free_thread_info(info) \
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free_pages((unsigned long)info, THREAD_SIZE_ORDER);
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#define thread_saved_pc(tsk) \
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((unsigned long)(pc_pointer(task_thread_info(tsk)->cpu_context.pc)))
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#define thread_saved_fp(tsk) \
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((unsigned long)(task_thread_info(tsk)->cpu_context.fp))
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extern void crunch_task_disable(struct thread_info *);
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extern void crunch_task_copy(struct thread_info *, void *);
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extern void crunch_task_restore(struct thread_info *, void *);
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extern void crunch_task_release(struct thread_info *);
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extern void iwmmxt_task_disable(struct thread_info *);
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extern void iwmmxt_task_copy(struct thread_info *, void *);
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extern void iwmmxt_task_restore(struct thread_info *, void *);
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extern void iwmmxt_task_release(struct thread_info *);
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extern void iwmmxt_task_switch(struct thread_info *);
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#endif
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/*
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* We use bit 30 of the preempt_count to indicate that kernel
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* preemption is occurring. See include/asm-arm/hardirq.h.
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*/
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#define PREEMPT_ACTIVE 0x40000000
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/*
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* thread information flags:
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* TIF_SYSCALL_TRACE - syscall trace active
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* TIF_NOTIFY_RESUME - resumption notification requested
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* TIF_SIGPENDING - signal pending
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* TIF_NEED_RESCHED - rescheduling necessary
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* TIF_USEDFPU - FPU was used by this task this quantum (SMP)
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* TIF_POLLING_NRFLAG - true if poll_idle() is polling TIF_NEED_RESCHED
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*/
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#define TIF_NOTIFY_RESUME 0
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#define TIF_SIGPENDING 1
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#define TIF_NEED_RESCHED 2
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#define TIF_SYSCALL_TRACE 8
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#define TIF_POLLING_NRFLAG 16
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#define TIF_USING_IWMMXT 17
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#define TIF_MEMDIE 18
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#define TIF_FREEZE 19
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#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
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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_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
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#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
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#define _TIF_USING_IWMMXT (1 << TIF_USING_IWMMXT)
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#define _TIF_FREEZE (1 << TIF_FREEZE)
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/*
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* Change these and you break ASM code in entry-common.S
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*/
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#define _TIF_WORK_MASK 0x000000ff
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#endif /* __KERNEL__ */
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#endif /* __ASM_ARM_THREAD_INFO_H */
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