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/* $XConsortium: SlowBcopy.c /main/1 1996/05/07 17:14:10 kaleb $ */
/*******************************************************************************
for Alpha Linux
*******************************************************************************/
/* $XFree86: xc/programs/Xserver/hw/xfree86/os-support/misc/SlowBcopy.c,v 1.6tsi Exp $ */
/*
* Create a dependency that should be immune from the effect of register
* renaming as is commonly seen in superscalar processors. This should
* insert a minimum of 100-ns delays between reads/writes at clock rates
* up to 100 MHz---GGL
*
* Slowbcopy(char *src, char *dst, int count)
*
*/
#include "X.h"
#include "xf86.h"
#include "xf86Priv.h"
#include "xf86_OSlib.h"
#include "compiler.h"
/* The outb() isn't needed on my machine, but who knows ... -- ost */
void
xf86SlowBcopy(unsigned char *src, unsigned char *dst, int len)
{
while(len--)
{
*dst++ = *src++;
#if !defined(__sparc__) && \
!defined(__powerpc__) && \
!defined(__mips__) && \
!defined(__ia64__)
outb(0x80, 0x00);
#endif
}
}
#ifdef __alpha__
/*
* The Jensen lacks dense memory, thus we have to address the bus via
* the sparse addressing scheme. Time critical code uses routines from
* BUSmemcpy.c
*
* Martin Ostermann (ost@comnets.rwth-aachen.de) - Apr.-Sep. 1996
*/
#ifdef linux
unsigned long _bus_base(void);
#ifdef TEST_JENSEN_CODE /* define to test the Sparse addressing on a non-Jensen */
#define SPARSE (5)
#else
#define SPARSE (7)
#endif
#define isJensen() (!_bus_base())
#else
#define isJensen() 0
#define SPARSE 0
#endif
void
xf86SlowBCopyFromBus(unsigned char *src, unsigned char *dst, int count)
{
if (isJensen())
{
unsigned long addr;
long result;
addr = (unsigned long) src;
while( count ){
result = *(volatile int *) addr;
result >>= ((addr>>SPARSE) & 3) * 8;
*dst++ = (unsigned char) (0xffUL & result);
addr += 1<<SPARSE;
count--;
outb(0x80, 0x00);
}
}
else
xf86SlowBcopy(src,dst,count);
}
void
xf86SlowBCopyToBus(unsigned char *src, unsigned char *dst, int count)
{
if (isJensen())
{
unsigned long addr;
addr = (unsigned long) dst;
while(count) {
*(volatile unsigned int *) addr = (unsigned short)(*src) * 0x01010101;
src++;
addr += 1<<SPARSE;
count--;
outb(0x80, 0x00);
}
}
else
xf86SlowBcopy(src,dst,count);
}
#endif
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