1/*
 2 * Copyright (C) 2013 Altera Corporation
 3 * Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch>
 4 * Copyright (C) 2004 Microtronix Datacom Ltd
 5 * Copyright (C) 2001 Ken Hill (khill@microtronix.com)
 6 *                    Vic Phillips (vic@microtronix.com)
 7 *
 8 * based on SPARC asm/processor_32.h which is:
 9 *
10 * Copyright (C) 1994 David S. Miller
11 *
12 * This file is subject to the terms and conditions of the GNU General Public
13 * License.  See the file "COPYING" in the main directory of this archive
14 * for more details.
15 */
16
17#ifndef _ASM_NIOS2_PROCESSOR_H
18#define _ASM_NIOS2_PROCESSOR_H
19
20#include <asm/ptrace.h>
21#include <asm/registers.h>
22#include <asm/page.h>
23
24#define NIOS2_FLAG_KTHREAD	0x00000001	/* task is a kernel thread */
25
26#define NIOS2_OP_NOP		0x1883a
27#define NIOS2_OP_BREAK		0x3da03a
28
29#ifdef __KERNEL__
30
31#define STACK_TOP	TASK_SIZE
32#define STACK_TOP_MAX	STACK_TOP
33
34#endif /* __KERNEL__ */
35
36/* Kuser helpers is mapped to this user space address */
37#define KUSER_BASE		0x1000
38#define KUSER_SIZE		(PAGE_SIZE)
39#ifndef __ASSEMBLY__
40
41# define TASK_SIZE		0x7FFF0000UL
42# define TASK_UNMAPPED_BASE	(PAGE_ALIGN(TASK_SIZE / 3))
43
44/* The Nios processor specific thread struct. */
45struct thread_struct {
46	struct pt_regs *kregs;
47
48	/* Context switch saved kernel state. */
49	unsigned long ksp;
50	unsigned long kpsr;
51};
52
53#define INIT_MMAP \
54	{ &init_mm, (0), (0), __pgprot(0x0), VM_READ | VM_WRITE | VM_EXEC }
55
56# define INIT_THREAD {			\
57	.kregs	= NULL,			\
58	.ksp	= 0,			\
59	.kpsr	= 0,			\
60}
61
62extern void start_thread(struct pt_regs *regs, unsigned long pc,
63			unsigned long sp);
64
65struct task_struct;
66
67/* Free all resources held by a thread. */
68static inline void release_thread(struct task_struct *dead_task)
69{
70}
71
72extern unsigned long get_wchan(struct task_struct *p);
73
74#define task_pt_regs(p) \
75	((struct pt_regs *)(THREAD_SIZE + task_stack_page(p)) - 1)
76
77/* Used by procfs */
78#define KSTK_EIP(tsk)	((tsk)->thread.kregs->ea)
79#define KSTK_ESP(tsk)	((tsk)->thread.kregs->sp)
80
81#define cpu_relax()	barrier()
82
83#endif /* __ASSEMBLY__ */
84
85#endif /* _ASM_NIOS2_PROCESSOR_H */