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/*

 * include/asm-m68k/processor.h

 *

 * Copyright (C) 1995 Hamish Macdonald

 */

#ifndef __ASM_M68K_PROCESSOR_H

#define __ASM_M68K_PROCESSOR_H

/*

 * Default implementation of macro that returns current

 * instruction pointer ("program counter").

 */

#define current_text_addr() ({ __label__ _l; _l: &&_l;})

#include <linux/config.h>

#include <asm/segment.h>

#include <asm/fpu.h>

#include <asm/ptrace.h>

static inline unsigned long rdusp(void)

{

        unsigned long usp;

        __asm__ __volatile__("move %/usp,%0" : "=a" (usp));

        return usp;

}

static inline void wrusp(unsigned long usp)

{

        __asm__ __volatile__("move %0,%/usp" : : "a" (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.

 */

#ifndef CONFIG_SUN3

#define TASK_SIZE       (0xF0000000UL)

#else

#ifdef __ASSEMBLY__

#define TASK_SIZE       (0x0E000000)

#else

#define TASK_SIZE       (0x0E000000UL)

#endif

#endif

/* This decides where the kernel will search for a free chunk of vm

 * space during mmap's.

 */

#ifndef CONFIG_SUN3

#define TASK_UNMAPPED_BASE      0xC0000000UL

#else

#define TASK_UNMAPPED_BASE      0x0A000000UL

#endif

#define TASK_UNMAPPED_ALIGN(addr, off)  PAGE_ALIGN(addr)

/*

 * Bus types

 */

#define EISA_bus 0

#define MCA_bus 0

/*

 * 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  faddr;           /* info about last fault */

        int            signo, code;

        unsigned long  fp[8*3];

        unsigned long  fpcntl[3];       /* fp control regs */

        unsigned char  fpstate[FPSTATESIZE];  /* floating point state */

};

#define INIT_THREAD  { \

        sizeof(init_stack) + (unsigned long) init_stack, 0, \

        PS_S, __KERNEL_DS, \

}

/*

 * Do necessary setup to start up a newly executed thread.

 */

static inline void start_thread(struct pt_regs * regs, unsigned long pc,

                                unsigned long usp)

{

        /* reads from user space */

        set_fs(USER_DS);

        regs->pc = pc;

        regs->sr &= ~0x2000;

        wrusp(usp);

}

/* 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)

{

}

extern int arch_kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);

#define copy_segments(tsk, mm)          do { } while (0)

#define release_segments(mm)            do { } while (0)

/*

 * Free current thread data structures etc..

 */

static inline void exit_thread(void)

{

}

/*

 * Return saved PC of a blocked thread.

 */

static inline unsigned long thread_saved_pc(struct thread_struct *t)

{

        extern void scheduling_functions_start_here(void);

        extern void scheduling_functions_end_here(void);

        struct switch_stack *sw = (struct switch_stack *)t->ksp;

        /* Check whether the thread is blocked in resume() */

        if (sw->retpc > (unsigned long)scheduling_functions_start_here &&

            sw->retpc < (unsigned long)scheduling_functions_end_here)

                return ((unsigned long *)sw->a6)[1];

        else

                return sw->retpc;

}

unsigned long get_wchan(struct task_struct *p);

#define KSTK_EIP(tsk)   \

    ({                  \

        unsigned long eip = 0;    \

        if ((tsk)->thread.esp0 > PAGE_SIZE && \

            (VALID_PAGE(virt_to_page((tsk)->thread.esp0)))) \

              eip = ((struct pt_regs *) (tsk)->thread.esp0)->pc; \

        eip; })

#define KSTK_ESP(tsk)   ((tsk) == current ? rdusp() : (tsk)->thread.usp)

#define THREAD_SIZE (2*PAGE_SIZE)

/* Allocation and freeing of basic task resources. */

#define alloc_task_struct() \

        ((struct task_struct *) __get_free_pages(GFP_KERNEL,1))

#define free_task_struct(p)     free_pages((unsigned long)(p),1)

#define get_task_struct(tsk)      atomic_inc(&virt_to_page(tsk)->count)

#define init_task       (init_task_union.task)

#define init_stack      (init_task_union.stack)

#define cpu_relax()     barrier()

#endif