1/* SPDX-License-Identifier: GPL-2.0 */
 2/*
 3 * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
 4 * Copyright (C) 2008-2009 PetaLogix
 5 * Copyright (C) 2006 Atmark Techno, Inc.
 6 */
 7
 8#ifndef _ASM_MICROBLAZE_PROCESSOR_H
 9#define _ASM_MICROBLAZE_PROCESSOR_H
10
11#include <asm/ptrace.h>
12#include <asm/setup.h>
13#include <asm/registers.h>
14#include <asm/entry.h>
15#include <asm/current.h>
16
17# ifndef __ASSEMBLY__
18/* from kernel/cpu/mb.c */
19extern const struct seq_operations cpuinfo_op;
20
21# define cpu_relax()		barrier()
22
23#define task_pt_regs(tsk) \
24		(((struct pt_regs *)(THREAD_SIZE + task_stack_page(tsk))) - 1)
25
26/* Do necessary setup to start up a newly executed thread. */
27void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long usp);
28
29extern void ret_from_fork(void);
30extern void ret_from_kernel_thread(void);
31
32# endif /* __ASSEMBLY__ */
33
34/*
35 * This is used to define STACK_TOP, and with MMU it must be below
36 * kernel base to select the correct PGD when handling MMU exceptions.
37 */
38# define TASK_SIZE	(CONFIG_KERNEL_START)
39
40/*
41 * This decides where the kernel will search for a free chunk of vm
42 * space during mmap's.
43 */
44# define TASK_UNMAPPED_BASE	(TASK_SIZE / 8 * 3)
45
46# define THREAD_KSP	0
47
48#  ifndef __ASSEMBLY__
49
50/* If you change this, you must change the associated assembly-languages
51 * constants defined below, THREAD_*.
52 */
53struct thread_struct {
54	/* kernel stack pointer (must be first field in structure) */
55	unsigned long	ksp;
56	unsigned long	ksp_limit;	/* if ksp <= ksp_limit stack overflow */
57	void		*pgdir;		/* root of page-table tree */
58	struct pt_regs	*regs;		/* Pointer to saved register state */
59};
60
61#  define INIT_THREAD { \
62	.ksp   = sizeof init_stack + (unsigned long)init_stack, \
63	.pgdir = swapper_pg_dir, \
64}
65
66unsigned long __get_wchan(struct task_struct *p);
67
68/* The size allocated for kernel stacks. This _must_ be a power of two! */
69# define KERNEL_STACK_SIZE	0x2000
70
71/* Return some info about the user process TASK.  */
72#  define task_tos(task)	((unsigned long)(task) + KERNEL_STACK_SIZE)
73#  define task_regs(task) ((struct pt_regs *)task_tos(task) - 1)
74
75#  define task_pt_regs_plus_args(tsk) \
76	((void *)task_pt_regs(tsk))
77
78#  define task_sp(task)	(task_regs(task)->r1)
79#  define task_pc(task)	(task_regs(task)->pc)
80/* Grotty old names for some.  */
81#  define KSTK_EIP(task)	(task_pc(task))
82#  define KSTK_ESP(task)	(task_sp(task))
83
84#  define STACK_TOP	TASK_SIZE
85#  define STACK_TOP_MAX	STACK_TOP
86
87#ifdef CONFIG_DEBUG_FS
88extern struct dentry *of_debugfs_root;
89#endif
90
91#  endif /* __ASSEMBLY__ */
92#endif /* _ASM_MICROBLAZE_PROCESSOR_H */