19b7ce8bad
This patch puts the CPU in sleep 0 when doing nothing, idle. This will turn of the CPU clock and thus save power. The CPU is waken again when an interrupt occurs. Signed-off-by: Hans-Christian Egtvedt <hcegtvedt@atmel.com> Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
109 lines
3.6 KiB
C
109 lines
3.6 KiB
C
/*
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* Copyright (C) 2004-2006 Atmel Corporation
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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_AVR32_THREAD_INFO_H
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#define __ASM_AVR32_THREAD_INFO_H
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#include <asm/page.h>
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#define THREAD_SIZE_ORDER 1
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#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
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#ifndef __ASSEMBLY__
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#include <asm/types.h>
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struct task_struct;
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struct exec_domain;
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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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__u32 cpu;
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__s32 preempt_count; /* 0 => preemptable, <0 => BUG */
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struct restart_block restart_block;
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__u8 supervisor_stack[0];
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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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* Get the thread information struct from C.
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* We do the usual trick and use the lower end of the stack for this
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*/
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static inline struct thread_info *current_thread_info(void)
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{
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unsigned long addr = ~(THREAD_SIZE - 1);
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asm("and %0, sp" : "=r"(addr) : "0"(addr));
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return (struct thread_info *)addr;
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}
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/* thread information allocation */
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#define alloc_thread_info(ti) \
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((struct thread_info *) __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER))
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#define free_thread_info(ti) free_pages((unsigned long)(ti), 1)
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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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#define PREEMPT_ACTIVE 0x40000000
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/*
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* Thread information flags
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* - these are process state flags that various assembly files may need to access
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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_POLLING_NRFLAG 4 /* true if poll_idle() is polling
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TIF_NEED_RESCHED */
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#define TIF_BREAKPOINT 5 /* true if we should break after return */
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#define TIF_SINGLE_STEP 6 /* single step after next break */
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#define TIF_MEMDIE 7
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#define TIF_RESTORE_SIGMASK 8 /* restore signal mask in do_signal */
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#define TIF_CPU_GOING_TO_SLEEP 9 /* CPU is entering sleep 0 mode */
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#define TIF_USERSPACE 31 /* true if FS sets userspace */
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#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
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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_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
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#define _TIF_BREAKPOINT (1 << TIF_BREAKPOINT)
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#define _TIF_SINGLE_STEP (1 << TIF_SINGLE_STEP)
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#define _TIF_MEMDIE (1 << TIF_MEMDIE)
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#define _TIF_RESTORE_SIGMASK (1 << TIF_RESTORE_SIGMASK)
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#define _TIF_CPU_GOING_TO_SLEEP (1 << TIF_CPU_GOING_TO_SLEEP)
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/* XXX: These two masks must never span more than 16 bits! */
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/* work to do on interrupt/exception return */
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#define _TIF_WORK_MASK 0x0000013e
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/* work to do on any return to userspace */
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#define _TIF_ALLWORK_MASK 0x0000013f
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/* work to do on return from debug mode */
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#define _TIF_DBGWORK_MASK 0x0000017e
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#endif /* __ASM_AVR32_THREAD_INFO_H */
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