Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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linux
1/*
2 * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
3 * Copyright (C) 2008-2009 PetaLogix
4 * Copyright (C) 2006 Atmark Techno, Inc.
5 *
6 * This file is subject to the terms and conditions of the GNU General Public
7 * License. See the file "COPYING" in the main directory of this archive
8 * for more details.
9 */
10
11#ifndef _ASM_MICROBLAZE_PROCESSOR_H
12#define _ASM_MICROBLAZE_PROCESSOR_H
13
14#include <asm/ptrace.h>
15#include <asm/setup.h>
16#include <asm/registers.h>
17#include <asm/segment.h>
18#include <asm/entry.h>
19#include <asm/current.h>
20
21# ifndef __ASSEMBLY__
22/* from kernel/cpu/mb.c */
23extern const struct seq_operations cpuinfo_op;
24
25# define cpu_relax() barrier()
26# define cpu_sleep() do {} while (0)
27# define prepare_to_copy(tsk) do {} while (0)
28
29#define task_pt_regs(tsk) \
30 (((struct pt_regs *)(THREAD_SIZE + task_stack_page(tsk))) - 1)
31
32/* Do necessary setup to start up a newly executed thread. */
33void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long usp);
34
35# endif /* __ASSEMBLY__ */
36
37# ifndef CONFIG_MMU
38/*
39 * User space process size: memory size
40 *
41 * TASK_SIZE on MMU cpu is usually 1GB. However, on no-MMU arch, both
42 * user processes and the kernel is on the same memory region. They
43 * both share the memory space and that is limited by the amount of
44 * physical memory. thus, we set TASK_SIZE == amount of total memory.
45 */
46# define TASK_SIZE (0x81000000 - 0x80000000)
47
48/*
49 * Default implementation of macro that returns current
50 * instruction pointer ("program counter").
51 */
52# define current_text_addr() ({ __label__ _l; _l: &&_l; })
53
54/*
55 * This decides where the kernel will search for a free chunk of vm
56 * space during mmap's. We won't be using it
57 */
58# define TASK_UNMAPPED_BASE 0
59
60/* definition in include/linux/sched.h */
61struct task_struct;
62
63/* thread_struct is gone. use thread_info instead. */
64struct thread_struct { };
65# define INIT_THREAD { }
66
67/* Free all resources held by a thread. */
68static inline void release_thread(struct task_struct *dead_task)
69{
70}
71
72/* Free all resources held by a thread. */
73static inline void exit_thread(void)
74{
75}
76
77extern unsigned long thread_saved_pc(struct task_struct *t);
78
79extern unsigned long get_wchan(struct task_struct *p);
80
81/*
82 * create a kernel thread without removing it from tasklists
83 */
84extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
85
86# define KSTK_EIP(tsk) (0)
87# define KSTK_ESP(tsk) (0)
88
89# else /* CONFIG_MMU */
90
91/*
92 * This is used to define STACK_TOP, and with MMU it must be below
93 * kernel base to select the correct PGD when handling MMU exceptions.
94 */
95# define TASK_SIZE (CONFIG_KERNEL_START)
96
97/*
98 * This decides where the kernel will search for a free chunk of vm
99 * space during mmap's.
100 */
101# define TASK_UNMAPPED_BASE (TASK_SIZE / 8 * 3)
102
103# define THREAD_KSP 0
104
105# ifndef __ASSEMBLY__
106
107/*
108 * Default implementation of macro that returns current
109 * instruction pointer ("program counter").
110 */
111# define current_text_addr() ({ __label__ _l; _l: &&_l; })
112
113/* If you change this, you must change the associated assembly-languages
114 * constants defined below, THREAD_*.
115 */
116struct thread_struct {
117 /* kernel stack pointer (must be first field in structure) */
118 unsigned long ksp;
119 unsigned long ksp_limit; /* if ksp <= ksp_limit stack overflow */
120 void *pgdir; /* root of page-table tree */
121 struct pt_regs *regs; /* Pointer to saved register state */
122};
123
124# define INIT_THREAD { \
125 .ksp = sizeof init_stack + (unsigned long)init_stack, \
126 .pgdir = swapper_pg_dir, \
127}
128
129/* Do necessary setup to start up a newly executed thread. */
130void start_thread(struct pt_regs *regs,
131 unsigned long pc, unsigned long usp);
132
133/* Free all resources held by a thread. */
134extern inline void release_thread(struct task_struct *dead_task)
135{
136}
137
138extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
139
140/* Free current thread data structures etc. */
141static inline void exit_thread(void)
142{
143}
144
145/* Return saved (kernel) PC of a blocked thread. */
146# define thread_saved_pc(tsk) \
147 ((tsk)->thread.regs ? (tsk)->thread.regs->r15 : 0)
148
149unsigned long get_wchan(struct task_struct *p);
150
151/* The size allocated for kernel stacks. This _must_ be a power of two! */
152# define KERNEL_STACK_SIZE 0x2000
153
154/* Return some info about the user process TASK. */
155# define task_tos(task) ((unsigned long)(task) + KERNEL_STACK_SIZE)
156# define task_regs(task) ((struct pt_regs *)task_tos(task) - 1)
157
158# define task_pt_regs_plus_args(tsk) \
159 (((void *)task_pt_regs(tsk)) - STATE_SAVE_ARG_SPACE)
160
161# define task_sp(task) (task_regs(task)->r1)
162# define task_pc(task) (task_regs(task)->pc)
163/* Grotty old names for some. */
164# define KSTK_EIP(task) (task_pc(task))
165# define KSTK_ESP(task) (task_sp(task))
166
167/* FIXME */
168# define deactivate_mm(tsk, mm) do { } while (0)
169
170# define STACK_TOP TASK_SIZE
171# define STACK_TOP_MAX STACK_TOP
172
173# endif /* __ASSEMBLY__ */
174# endif /* CONFIG_MMU */
175#endif /* _ASM_MICROBLAZE_PROCESSOR_H */