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1 /*
2  * include/asm-cris/processor.h
3  *
4  * Copyright (C) 2000, 2001 Axis Communications AB
5  *
6  * Authors:         Bjorn Wesen        Initial version
7  *
8  */
9 
10 #ifndef __ASM_CRIS_PROCESSOR_H
11 #define __ASM_CRIS_PROCESSOR_H
12 
13 #include <asm/page.h>
14 #include <asm/ptrace.h>
15 #include <arch/processor.h>
16 #include <arch/system.h>
17 
18 struct task_struct;
19 
20 #define STACK_TOP	TASK_SIZE
21 #define STACK_TOP_MAX	STACK_TOP
22 
23 /* This decides where the kernel will search for a free chunk of vm
24  * space during mmap's.
25  */
26 #define TASK_UNMAPPED_BASE      (PAGE_ALIGN(TASK_SIZE / 3))
27 
28 /* THREAD_SIZE is the size of the thread_info/kernel_stack combo.
29  * normally, the stack is found by doing something like p + THREAD_SIZE
30  * in CRIS, a page is 8192 bytes, which seems like a sane size
31  */
32 #define THREAD_SIZE       PAGE_SIZE
33 #define THREAD_SIZE_ORDER (0)
34 
35 /*
36  * At user->kernel entry, the pt_regs struct is stacked on the top of the kernel-stack.
37  * This macro allows us to find those regs for a task.
38  * Notice that subsequent pt_regs stackings, like recursive interrupts occurring while
39  * we're in the kernel, won't affect this - only the first user->kernel transition
40  * registers are reached by this.
41  */
42 
43 #define user_regs(thread_info) (((struct pt_regs *)((unsigned long)(thread_info) + THREAD_SIZE)) - 1)
44 
45 /*
46  * Dito but for the currently running task
47  */
48 
49 #define task_pt_regs(task) user_regs(task_thread_info(task))
50 
51 unsigned long get_wchan(struct task_struct *p);
52 
53 #define KSTK_ESP(tsk)   ((tsk) == current ? rdusp() : (tsk)->thread.usp)
54 
55 extern unsigned long thread_saved_pc(struct task_struct *tsk);
56 
57 /* Free all resources held by a thread. */
release_thread(struct task_struct * dead_task)58 static inline void release_thread(struct task_struct *dead_task)
59 {
60         /* Nothing needs to be done.  */
61 }
62 
63 #define init_stack      (init_thread_union.stack)
64 
65 #define cpu_relax()     barrier()
66 #define cpu_relax_lowlatency() cpu_relax()
67 
68 void default_idle(void);
69 
70 #endif /* __ASM_CRIS_PROCESSOR_H */
71