| 1 | |
| 2 | * include/asm-cris/processor.h
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| 3 | *
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| 4 | * Copyright (C) 2000, 2001 Axis Communications AB
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| 5 | *
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| 6 | * Authors: Bjorn Wesen Initial version
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| 7 | *
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| 8 |
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| 9 |
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| 10 | #ifndef __ASM_CRIS_PROCESSOR_H
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| 11 | #define __ASM_CRIS_PROCESSOR_H
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| 12 |
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| 13 | #include <asm/system.h>
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| 14 | #include <asm/page.h>
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| 15 | #include <asm/ptrace.h>
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| 16 | #include <asm/arch/processor.h>
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| 17 |
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| 18 | struct task_struct;
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| 19 |
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| 20 | #define STACK_TOP TASK_SIZE
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| 21 | #define STACK_TOP_MAX STACK_TOP
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| 22 |
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| 23 | |
| 24 | * space during mmap's.
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| 25 |
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| 26 | #define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 3))
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| 27 |
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| 28 | |
| 29 | * normally, the stack is found by doing something like p + THREAD_SIZE
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| 30 | * in CRIS, a page is 8192 bytes, which seems like a sane size
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| 31 |
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| 32 |
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| 33 | #define THREAD_SIZE PAGE_SIZE
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| 34 | #define KERNEL_STACK_SIZE PAGE_SIZE
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| 35 |
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| 36 | |
| 37 | * At user->kernel entry, the pt_regs struct is stacked on the top of the kernel-stack.
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| 38 | * This macro allows us to find those regs for a task.
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| 39 | * Notice that subsequent pt_regs stackings, like recursive interrupts occurring while
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| 40 | * we're in the kernel, won't affect this - only the first user->kernel transition
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| 41 | * registers are reached by this.
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| 42 |
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| 43 |
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| 44 | #define user_regs(thread_info) (((struct pt_regs *)((unsigned long)(thread_info) + THREAD_SIZE)) - 1)
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| 45 |
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| 46 | |
| 47 | * Dito but for the currently running task
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| 48 |
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| 49 |
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| 50 | #define task_pt_regs(task) user_regs(task_thread_info(task))
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| 51 | #define current_regs() task_pt_regs(current)
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| 52 |
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| 53 | static inline void prepare_to_copy(struct task_struct *tsk)
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| 54 | {
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| 55 | }
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| 56 |
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| 57 | extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
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| 58 |
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| 59 | unsigned long get_wchan(struct task_struct *p);
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| 60 |
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| 61 | #define KSTK_ESP(tsk) ((tsk) == current ? rdusp() : (tsk)->thread.usp)
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| 62 |
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| 63 | extern unsigned long thread_saved_pc(struct task_struct *tsk);
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| 64 |
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| 65 |
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| 66 | static inline void release_thread(struct task_struct *dead_task)
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| 67 | {
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| 68 |
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| 69 | }
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| 70 |
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| 71 | #define init_stack (init_thread_union.stack)
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| 72 |
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| 73 | #define cpu_relax() barrier()
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| 74 |
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| 75 | #endif
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