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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 <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)

#define MAX_USER_ADDR   TASK_SIZE

#define MMAP_SEARCH_START (TASK_SIZE/3)

/*

 * 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 short))

/*

 * 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  *pagedir_v;      /* root page table virtual addr */

        unsigned long  pagedir_p;       /* root page table physaddr */

        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 short 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, \

        NULL, 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 usp)

{

        unsigned long nilstate = 0;

        /* clear floating point state */

        __asm__ __volatile__ ("frestore %0@" : : "a" (&nilstate));

        /* reads from user space */

        set_fs(USER_DS);

        regs->pc = pc;

        regs->sr &= ~0x2000;

        wrusp(usp);

}

/*

 * Return saved PC of a blocked thread.

 */

extern inline unsigned long thread_saved_pc(struct thread_struct *t)

{

        return ((unsigned long *)((struct switch_stack *)t->ksp)->a6)[1];

}

#endif