Orange Pi5 kernel

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * include/asm-h8300/processor.h
 *
 * Copyright (C) 2002 Yoshinori Sato
 *
 * Based on: linux/asm-m68nommu/processor.h
 *
 * Copyright (C) 1995 Hamish Macdonald
 */
 
#ifndef __ASM_H8300_PROCESSOR_H
#define __ASM_H8300_PROCESSOR_H
 
#include <linux/compiler.h>
#include <asm/segment.h>
#include <asm/ptrace.h>
#include <asm/current.h>
 
static inline unsigned long rdusp(void)
{
<------>extern unsigned int	_sw_usp;
 
<------>return _sw_usp;
}
 
static inline void wrusp(unsigned long usp)
{
<------>extern unsigned int	_sw_usp;
 
<------>_sw_usp = usp;
}
 
/*
 * User space process size: 3.75GB. This is hardcoded into a few places,
 * so don't change it unless you know what you are doing.
 */
#define TASK_SIZE	(0xFFFFFFFFUL)
 
#ifdef __KERNEL__
#define STACK_TOP	TASK_SIZE
#define STACK_TOP_MAX	STACK_TOP
#endif
 
/*
 * 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
 
struct thread_struct {
<------>unsigned long  ksp;		/* kernel stack pointer */
<------>unsigned long  usp;		/* user stack pointer */
<------>unsigned long  ccr;		/* saved status register */
<------>unsigned long  esp0;            /* points to SR of stack frame */
<------>struct {
<------><------>unsigned short *addr;
<------><------>unsigned short inst;
<------>} breakinfo;
};
 
#define INIT_THREAD  {						\
<------>.ksp  = sizeof(init_stack) + (unsigned long)init_stack, \
<------>.usp  = 0,						\
<------>.ccr  = PS_S,						\
<------>.esp0 = 0,						\
<------>.breakinfo = {						\
<------><------>.addr = (unsigned short *)-1,			\
<------><------>.inst = 0					\
<------>}							\
}
 
/*
 * Do necessary setup to start up a newly executed thread.
 *
 * pass the data segment into user programs if it exists,
 * it can't hurt anything as far as I can tell
 */
#if defined(CONFIG_CPU_H8300H)
#define start_thread(_regs, _pc, _usp)				\
do {								\
<------>(_regs)->pc = (_pc);					\
<------>(_regs)->ccr = 0x00;	   /* clear all flags */	\
<------>(_regs)->er5 = current->mm->start_data;	/* GOT base */	\
<------>(_regs)->sp = ((unsigned long)(_usp)) - sizeof(unsigned long) * 3; \
} while (0)
#endif
#if defined(CONFIG_CPU_H8S)
#define start_thread(_regs, _pc, _usp)				\
do {								\
<------>(_regs)->pc = (_pc);					\
<------>(_regs)->ccr = 0x00;	   /* clear kernel flag */	\
<------>(_regs)->exr = 0x78;	   /* enable all interrupts */	\
<------>(_regs)->er5 = current->mm->start_data;	/* GOT base */	\
<------>/* 14 = space for retaddr(4), vector(4), er0(4) and exr(2) on stack */ \
<------>(_regs)->sp = ((unsigned long)(_usp)) - 14;		\
} while (0)
#endif
 
/* Forward declaration, a strange C thing */
struct task_struct;
 
/* 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);
 
#define	KSTK_EIP(tsk)	\
<------>({			 \
<------><------>unsigned long eip = 0;	      \
<------><------>if ((tsk)->thread.esp0 > PAGE_SIZE &&	\
<------><------>    MAP_NR((tsk)->thread.esp0) < max_mapnr)	 \
<------><------><------>eip = ((struct pt_regs *) (tsk)->thread.esp0)->pc; \
<------><------>eip; })
 
#define	KSTK_ESP(tsk)	((tsk) == current ? rdusp() : (tsk)->thread.usp)
 
#define cpu_relax()    barrier()
 
#define HARD_RESET_NOW() ({		\
<------>local_irq_disable();		\
<------>asm("jmp @@0");			\
})
 
#endif