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/*
 * include/asm-m68k/processor.h
 *
 * Copyright (C) 1995 Hamish Macdonald
 */
 
#ifndef __ASM_M68K_PROCESSOR_H
#define __ASM_M68K_PROCESSOR_H
 
#include <linux/config.h>
#include <asm/segment.h>
 
/*
 * 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	(0xF0000000UL)*/
 
/*
 * Bus types
 */
#define EISA_bus__is_a_macro	1
#define EISA_bus 0
#define MCA_bus__is_a_macro	1
#define MCA_bus 0
 
/*
 * The m68k has no problems with write protection
 */
#define wp_works_ok__is_a_macro	1
#define wp_works_ok 1
 
/* MAX floating point unit state size (FSAVE/FRESTORE) */
#define FPSTATESIZE   (216/sizeof(unsigned char))
 
/* 
 * if you change this structure, you must change the code and offsets
 * in m68k/machasm.S
 */
 
struct thread_struct {
	unsigned long  ksp;		/* kernel stack pointer */
	unsigned long  usp;		/* user stack pointer */
	unsigned short sr;		/* saved status register */
	unsigned short fs;		/* saved fs (sfc, dfc) */
	unsigned long  crp[2];		/* cpu root pointer */
	unsigned long  esp0;		/* points to SR of stack frame */
	unsigned long  fp[8*3];
	unsigned long  fpcntl[3];	/* fp control regs */
	unsigned char  fpstate[FPSTATESIZE];  /* floating point state */
};
 
#define INIT_MMAP { &init_mm, 0, 0x40000000, __pgprot(_PAGE_PRESENT|_PAGE_ACCESSED), VM_READ | VM_WRITE | VM_EXEC }
 
#define INIT_TSS  { \
	sizeof(init_kernel_stack) + (long) init_kernel_stack, 0, \
	PS_S, KERNEL_DS, \
	{0, 0}, 0, {0,}, {0, 0, 0}, {0,} \
}
 
#define alloc_kernel_stack()    __get_free_page(GFP_KERNEL)
#define free_kernel_stack(page) free_page((page))
 
/*
 * Do necessary setup to start up a newly executed thread.
 */
static inline void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long a5,
				unsigned long usp)
{
#ifndef NO_MM
	unsigned long nilstate = 0;
#endif
 
	/* reads from user space */
	set_fs(USER_DS);
 
	regs->pc = pc;
	regs->d5 = a5; /* What, me cheat? */
	regs->sr &= ~0x2000;
	/*regs->sr |= 0x4000; */  /* Trace on */
	wrusp(usp);
}
 
#ifndef CONFIG_COLDFIRE
static inline void tron(void)
{
	__asm__ __volatile__ ("
	oriw #0x8000, %sr
	");	
}
 
static inline void troncof(void)
{
	__asm__ __volatile__ ("
	oriw #0x4000, %sr
	");		
}
 
static inline void troff(void)
{
	__asm__ __volatile__ ("
	andiw #0x3fff, %sr
	");
}
#endif
 
/*
 * Return saved PC of a blocked thread.
 */
extern inline unsigned long thread_saved_pc(struct thread_struct *t)
{
	/*extern unsigned long high_memory;*/
	unsigned long frame = ((struct switch_stack *)t->ksp)->a6;
	/*if (frame > PAGE_SIZE && frame < high_memory)*/
		return ((unsigned long *)frame)[1];
	/*else
		return 0;*/
}
 
#endif