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# ifndef CONFIG_MMU
35/*
36 * User space process size: memory size
37 *
38 * TASK_SIZE on MMU cpu is usually 1GB. However, on no-MMU arch, both
39 * user processes and the kernel is on the same memory region. They
40 * both share the memory space and that is limited by the amount of
41 * physical memory. thus, we set TASK_SIZE == amount of total memory.
42 */
43# define TASK_SIZE	(0x81000000 - 0x80000000)
44
45/*
46 * This decides where the kernel will search for a free chunk of vm
47 * space during mmap's. We won't be using it
48 */
49# define TASK_UNMAPPED_BASE	0
50
51/* definition in include/linux/sched.h */
52struct task_struct;
53
54/* thread_struct is gone. use thread_info instead. */
55struct thread_struct { };
56# define INIT_THREAD	{ }
57
58/* Free all resources held by a thread. */
59static inline void release_thread(struct task_struct *dead_task)
60{
61}
62
63extern unsigned long get_wchan(struct task_struct *p);
64
65# define KSTK_EIP(tsk)	(0)
66# define KSTK_ESP(tsk)	(0)
67
68# else /* CONFIG_MMU */
69
70/*
71 * This is used to define STACK_TOP, and with MMU it must be below
72 * kernel base to select the correct PGD when handling MMU exceptions.
73 */
74# define TASK_SIZE	(CONFIG_KERNEL_START)
75
76/*
77 * This decides where the kernel will search for a free chunk of vm
78 * space during mmap's.
79 */
80# define TASK_UNMAPPED_BASE	(TASK_SIZE / 8 * 3)
81
82# define THREAD_KSP	0
83
84#  ifndef __ASSEMBLY__
85
86/* If you change this, you must change the associated assembly-languages
87 * constants defined below, THREAD_*.
88 */
89struct thread_struct {
90	/* kernel stack pointer (must be first field in structure) */
91	unsigned long	ksp;
92	unsigned long	ksp_limit;	/* if ksp <= ksp_limit stack overflow */
93	void		*pgdir;		/* root of page-table tree */
94	struct pt_regs	*regs;		/* Pointer to saved register state */
95};
96
97#  define INIT_THREAD { \
98	.ksp   = sizeof init_stack + (unsigned long)init_stack, \
99	.pgdir = swapper_pg_dir, \
100}
101
102/* Free all resources held by a thread. */
103static inline void release_thread(struct task_struct *dead_task)
104{
105}
106
107unsigned long get_wchan(struct task_struct *p);
108
109/* The size allocated for kernel stacks. This _must_ be a power of two! */
110# define KERNEL_STACK_SIZE	0x2000
111
112/* Return some info about the user process TASK.  */
113#  define task_tos(task)	((unsigned long)(task) + KERNEL_STACK_SIZE)
114#  define task_regs(task) ((struct pt_regs *)task_tos(task) - 1)
115
116#  define task_pt_regs_plus_args(tsk) \
117	((void *)task_pt_regs(tsk))
118
119#  define task_sp(task)	(task_regs(task)->r1)
120#  define task_pc(task)	(task_regs(task)->pc)
121/* Grotty old names for some.  */
122#  define KSTK_EIP(task)	(task_pc(task))
123#  define KSTK_ESP(task)	(task_sp(task))
124
125/* FIXME */
126#  define deactivate_mm(tsk, mm)	do { } while (0)
127
128#  define STACK_TOP	TASK_SIZE
129#  define STACK_TOP_MAX	STACK_TOP
130
131#ifdef CONFIG_DEBUG_FS
132extern struct dentry *of_debugfs_root;
133#endif
134
135#  endif /* __ASSEMBLY__ */
136# endif /* CONFIG_MMU */
137#endif /* _ASM_MICROBLAZE_PROCESSOR_H */
138