
/*
 * ctrl87.c
 */


#define __CONTROL87_C__


#include "../include/i386/ctrl87.h"
#include <config.h>

#ifdef __GNUC__
#ifdef __i386__
#ifndef NOASSEMBLY

/***** _control87 *****/
unsigned short _control87(unsigned short newcw, unsigned short mask)
{
    unsigned short cw;

    asm volatile ("                                                    \n\
      wait                                                          \n\
      fstcw  %0                                                       ": /* outputs */ "=m" (cw)
		  :		/* inputs */
	);

    if (mask) {			/* mask is not 0 */
	asm volatile ("                                                  \n\
        mov    %2, %%ax                                             \n\
        mov    %3, %%cx                                             \n\
        and    %%cx, %%ax                                           \n\
        not    %%cx                                                 \n\
        nop                                                         \n\
        wait                                                        \n\
        mov    %1, %%dx                                             \n\
        and    %%cx, %%dx                                           \n\
        or     %%ax, %%dx                                           \n\
        mov    %%dx, %0                                             \n\
        wait                                                        \n\
        fldcw  %1                                                     ":
		      /* outputs */ "=m" (cw)
		      : /* inputs */ "m"(cw), "m"(newcw), "m"(mask)
		      : /* registers */ "ax", "cx", "dx"
	    );
    }
    return cw;

}				/* _control87 */
#endif
#endif
#endif

#ifdef __GNUC__
#ifdef __i386__
#if 0

/*
 * copy.c -- fast memcpy routines for Pentium using FPU
 * Copyright (c) 1995, 1996 Robert Krawitz <rlk@tiac.net>
 * and Gerhard Koerting (G.Koerting@techem.ruhr-uni-bochum.de)
 * Exception handling in kernel/userspace routines by Gerhard
 * Koerting.
 * May be used and redistributed under the terms of the GNU Public License
 */
#include <sys/types.h>

#define CACHELINE 32
#define CACHEMASK (CACHELINE - 1)
#define BIGMASK (~255)
#define SMALLMASK (~31)

void *penium___zero_chunk(void *_to, size_t _bytes)
{
    unsigned long temp0, temp1;
    register unsigned long to asm("di") = (unsigned long) _to;
    register unsigned long bytes asm("dx") = (unsigned long) _bytes;
    char save[42];
    unsigned long zbuf[2] = { 0, 0 };
    temp0 = to & 7;
    if (temp0) {
	bytes -= temp0;
	asm __volatile__("cld\n\t"
			 "rep; stosb\n\t":"=D"(to):"D"(to), "a"(0),
			 "c"(temp0):"cx");
    }
    asm __volatile__("shrl $3, %0\n\t"
		     "fstenv %4\n\t"
		     "fstpt 32+%4\n\t"
		     "movl (%1), %2\n\t"
		     "fildq %3\n"
		     "2:\n\t"
		     "fstl (%1)\n\t"
		     "addl $8, %1\n\t"
		     "decl %0\n\t"
		     "jne 2b\n\t"
		     "fstpl %%st\n\t"
		     "fldt 32+%4\n\t"
		     "fldenv %4\n\t":"=&r"(temp0), "=&r"(to),
		     "=&r"(temp1):"m"(*(char *) zbuf), "m"(*(char *) save),
		     "0"(bytes), "1"(to));
    bytes &= 7;
    if (bytes) {
	asm __volatile__("shrl $2, %%ecx\n\t"
			 "cld\n\t"
			 "rep ; stosl\n\t"
			 "testb $2,%%dl\n\t"
			 "je 111f\n\t"
			 "stosw\n"
			 "111:\ttestb $1,%%dl\n\t"
			 "je 112f\n\t"
			 "stosb\n"
			 "112:":"=D"(to):"D"(to), "a"(0), "c"(bytes),
			 "d"(bytes):"cx", "memory");
    }
    return _to;
}

void *pentium__memcpy_g(void *_to, const void *_from, size_t _bytes)
{
    register unsigned long from asm("si") = (unsigned long) _from;
    register unsigned long to asm("di") = (unsigned long) _to;
    register unsigned long bytes asm("dx") = (unsigned long) _bytes;
    if (bytes >= 1024) {
	unsigned long temp0, temp1;
	char save[108];

	temp0 = to & 7;
	if (temp0) {
	    bytes -= temp0;
	    asm __volatile__("cld\n\t"
			     "rep; movsb\n\t":"=D"(to), "=S"(from):"D"(to),
			     "S"(from), "c"(temp0):"cx");
	}
	asm __volatile__("shrl $8, %0\n\t"
			 "movl (%2), %3\n\t" "movl (%1), %3\n\t"
			 /*"fsave %4\n" */
			 "1:\n\t"
			 "movl $4, %3\n"
			 "2:\n\t"
			 "fildq 0x0(%2)\n\t"
			 "fildq 0x20(%2)\n\t"
			 "fildq 0x40(%2)\n\t"
			 "fildq 0x60(%2)\n\t"
			 "fildq 0x80(%2)\n\t"
			 "fildq 0xa0(%2)\n\t"
			 "fildq 0xc0(%2)\n\t"
			 "fildq 0xe0(%2)\n\t"
			 "fxch\n\t"
			 "fistpq 0xc0(%1)\n\t"
			 "fistpq 0xe0(%1)\n\t"
			 "fistpq 0xa0(%1)\n\t"
			 "fistpq 0x80(%1)\n\t"
			 "fistpq 0x60(%1)\n\t"
			 "fistpq 0x40(%1)\n\t"
			 "fistpq 0x20(%1)\n\t"
			 "fistpq 0x0(%1)\n\t"
			 "addl $8, %2\n\t"
			 "addl $8, %1\n\t"
			 "decl %3\n\t"
			 "jne 2b\n\t"
			 "addl $224, %2\n\t"
			 "addl $224, %1\n\t" "decl %0\n\t" "jne 1b\n\t"
			 /*"frstor %4\n\t" */
			 :"=&r"(temp0), "=&r"(to), "=&r"(from),
			 "=&r"(temp1):"m"(save[0]), "0"(bytes), "1"(to),
			 "2"(from):"memory");
	bytes &= 255;
    }
    if (bytes) {
	asm __volatile__("shrl $2, %%ecx\n\t"
			 "cld\n\t"
			 "rep ; movsl\n\t"
			 "testb $2,%%dl\n\t"
			 "je 111f\n\t"
			 "movsw\n"
			 "111:\ttestb $1,%%dl\n\t"
			 "je 112f\n\t"
			 "movsb\n"
			 "112:":"=D"(to), "=S"(from):"D"(to), "S"(from),
			 "c"(bytes), "d"(bytes):"cx", "memory");
    }
    return _to;
}
#endif
#endif
#endif
