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 /*
42 * Default implementation of macro that returns current
43 * instruction pointer ("program counter").
44 */
45 #define current_text_addr() ({ __label__ _l; _l: &&_l; })
46
47 # define TASK_SIZE 0x7FFF0000UL
48 # define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 3))
49
50 /* The Nios processor specific thread struct. */
51 struct thread_struct {
52 struct pt_regs *kregs;
53
54 /* Context switch saved kernel state. */
55 unsigned long ksp;
56 unsigned long kpsr;
57 };
58
59 #define INIT_MMAP \
60 { &init_mm, (0), (0), __pgprot(0x0), VM_READ | VM_WRITE | VM_EXEC }
61
62 # define INIT_THREAD { \
63 .kregs = NULL, \
64 .ksp = 0, \
65 .kpsr = 0, \
66 }
67
68 extern void start_thread(struct pt_regs *regs, unsigned long pc,
69 unsigned long sp);
70
71 struct task_struct;
72
73 /* Free all resources held by a thread. */
74 static inline void release_thread(struct task_struct *dead_task)
75 {
76 }
77
78 extern unsigned long get_wchan(struct task_struct *p);
79
80 #define task_pt_regs(p) \
81 ((struct pt_regs *)(THREAD_SIZE + task_stack_page(p)) - 1)
82
83 /* Used by procfs */
84 #define KSTK_EIP(tsk) ((tsk)->thread.kregs->ea)
85 #define KSTK_ESP(tsk) ((tsk)->thread.kregs->sp)
86
87 #define cpu_relax() barrier()
88
89 #endif /* __ASSEMBLY__ */
90
91 #endif /* _ASM_NIOS2_PROCESSOR_H */
92
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