/Ethereal-msm8939-beta9/arch/microblaze/include/asm/processor.h

  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
 26#define task_pt_regs(tsk) \
 27		(((struct pt_regs *)(THREAD_SIZE + task_stack_page(tsk))) - 1)
 28
 29/* Do necessary setup to start up a newly executed thread. */
 30void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long usp);
 31
 32extern void ret_from_fork(void);
 33extern void ret_from_kernel_thread(void);
 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# define KSTK_EIP(tsk)	(0)
 82# define KSTK_ESP(tsk)	(0)
 83
 84# else /* CONFIG_MMU */
 85
 86/*
 87 * This is used to define STACK_TOP, and with MMU it must be below
 88 * kernel base to select the correct PGD when handling MMU exceptions.
 89 */
 90# define TASK_SIZE	(CONFIG_KERNEL_START)
 91
 92/*
 93 * This decides where the kernel will search for a free chunk of vm
 94 * space during mmap's.
 95 */
 96# define TASK_UNMAPPED_BASE	(TASK_SIZE / 8 * 3)
 97
 98# define THREAD_KSP	0
 99
100#  ifndef __ASSEMBLY__
101
102/*
103 * Default implementation of macro that returns current
104 * instruction pointer ("program counter").
105 */
106#  define current_text_addr()	({ __label__ _l; _l: &&_l; })
107
108/* If you change this, you must change the associated assembly-languages
109 * constants defined below, THREAD_*.
110 */
111struct thread_struct {
112	/* kernel stack pointer (must be first field in structure) */
113	unsigned long	ksp;
114	unsigned long	ksp_limit;	/* if ksp <= ksp_limit stack overflow */
115	void		*pgdir;		/* root of page-table tree */
116	struct pt_regs	*regs;		/* Pointer to saved register state */
117};
118
119#  define INIT_THREAD { \
120	.ksp   = sizeof init_stack + (unsigned long)init_stack, \
121	.pgdir = swapper_pg_dir, \
122}
123
124/* Free all resources held by a thread. */
125extern inline void release_thread(struct task_struct *dead_task)
126{
127}
128
129/* Free current thread data structures etc.  */
130static inline void exit_thread(void)
131{
132}
133
134/* Return saved (kernel) PC of a blocked thread.  */
135#  define thread_saved_pc(tsk)	\
136	((tsk)->thread.regs ? (tsk)->thread.regs->r15 : 0)
137
138unsigned long get_wchan(struct task_struct *p);
139
140/* The size allocated for kernel stacks. This _must_ be a power of two! */
141# define KERNEL_STACK_SIZE	0x2000
142
143/* Return some info about the user process TASK.  */
144#  define task_tos(task)	((unsigned long)(task) + KERNEL_STACK_SIZE)
145#  define task_regs(task) ((struct pt_regs *)task_tos(task) - 1)
146
147#  define task_pt_regs_plus_args(tsk) \
148	((void *)task_pt_regs(tsk))
149
150#  define task_sp(task)	(task_regs(task)->r1)
151#  define task_pc(task)	(task_regs(task)->pc)
152/* Grotty old names for some.  */
153#  define KSTK_EIP(task)	(task_pc(task))
154#  define KSTK_ESP(task)	(task_sp(task))
155
156/* FIXME */
157#  define deactivate_mm(tsk, mm)	do { } while (0)
158
159#  define STACK_TOP	TASK_SIZE
160#  define STACK_TOP_MAX	STACK_TOP
161
162#ifdef CONFIG_DEBUG_FS
163extern struct dentry *of_debugfs_root;
164#endif
165
166#  endif /* __ASSEMBLY__ */
167# endif /* CONFIG_MMU */
168#endif /* _ASM_MICROBLAZE_PROCESSOR_H */