Orange Pi5 kernel

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
 * Copyright (C) 2008-2009 PetaLogix
 * Copyright (C) 2006 Atmark Techno, Inc.
 */
 
#ifndef _ASM_MICROBLAZE_PROCESSOR_H
#define _ASM_MICROBLAZE_PROCESSOR_H
 
#include <asm/ptrace.h>
#include <asm/setup.h>
#include <asm/registers.h>
#include <asm/entry.h>
#include <asm/current.h>
 
# ifndef __ASSEMBLY__
/* from kernel/cpu/mb.c */
extern const struct seq_operations cpuinfo_op;
 
# define cpu_relax()		barrier()
 
#define task_pt_regs(tsk) \
<------><------>(((struct pt_regs *)(THREAD_SIZE + task_stack_page(tsk))) - 1)
 
/* Do necessary setup to start up a newly executed thread. */
void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long usp);
 
extern void ret_from_fork(void);
extern void ret_from_kernel_thread(void);
 
# endif /* __ASSEMBLY__ */
 
# ifndef CONFIG_MMU
/*
 * User space process size: memory size
 *
 * TASK_SIZE on MMU cpu is usually 1GB. However, on no-MMU arch, both
 * user processes and the kernel is on the same memory region. They
 * both share the memory space and that is limited by the amount of
 * physical memory. thus, we set TASK_SIZE == amount of total memory.
 */
# define TASK_SIZE	(0x81000000 - 0x80000000)
 
/*
 * This decides where the kernel will search for a free chunk of vm
 * space during mmap's. We won't be using it
 */
# define TASK_UNMAPPED_BASE	0
 
/* definition in include/linux/sched.h */
struct task_struct;
 
/* thread_struct is gone. use thread_info instead. */
struct thread_struct { };
# define INIT_THREAD	{ }
 
/* Free all resources held by a thread. */
static inline void release_thread(struct task_struct *dead_task)
{
}
 
extern unsigned long get_wchan(struct task_struct *p);
 
# define KSTK_EIP(tsk)	(0)
# define KSTK_ESP(tsk)	(0)
 
# else /* CONFIG_MMU */
 
/*
 * This is used to define STACK_TOP, and with MMU it must be below
 * kernel base to select the correct PGD when handling MMU exceptions.
 */
# define TASK_SIZE	(CONFIG_KERNEL_START)
 
/*
 * This decides where the kernel will search for a free chunk of vm
 * space during mmap's.
 */
# define TASK_UNMAPPED_BASE	(TASK_SIZE / 8 * 3)
 
# define THREAD_KSP	0
 
#  ifndef __ASSEMBLY__
 
/* If you change this, you must change the associated assembly-languages
 * constants defined below, THREAD_*.
 */
struct thread_struct {
<------>/* kernel stack pointer (must be first field in structure) */
<------>unsigned long	ksp;
<------>unsigned long	ksp_limit;	/* if ksp <= ksp_limit stack overflow */
<------>void		*pgdir;		/* root of page-table tree */
<------>struct pt_regs	*regs;		/* Pointer to saved register state */
};
 
#  define INIT_THREAD { \
<------>.ksp   = sizeof init_stack + (unsigned long)init_stack, \
<------>.pgdir = swapper_pg_dir, \
}
 
/* Free all resources held by a thread. */
static inline void release_thread(struct task_struct *dead_task)
{
}
 
unsigned long get_wchan(struct task_struct *p);
 
/* The size allocated for kernel stacks. This _must_ be a power of two! */
# define KERNEL_STACK_SIZE	0x2000
 
/* Return some info about the user process TASK.  */
#  define task_tos(task)	((unsigned long)(task) + KERNEL_STACK_SIZE)
#  define task_regs(task) ((struct pt_regs *)task_tos(task) - 1)
 
#  define task_pt_regs_plus_args(tsk) \
<------>((void *)task_pt_regs(tsk))
 
#  define task_sp(task)	(task_regs(task)->r1)
#  define task_pc(task)	(task_regs(task)->pc)
/* Grotty old names for some.  */
#  define KSTK_EIP(task)	(task_pc(task))
#  define KSTK_ESP(task)	(task_sp(task))
 
/* FIXME */
#  define deactivate_mm(tsk, mm)	do { } while (0)
 
#  define STACK_TOP	TASK_SIZE
#  define STACK_TOP_MAX	STACK_TOP
 
#ifdef CONFIG_DEBUG_FS
extern struct dentry *of_debugfs_root;
#endif
 
#  endif /* __ASSEMBLY__ */
# endif /* CONFIG_MMU */
#endif /* _ASM_MICROBLAZE_PROCESSOR_H */