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