e717eb82dc
The outport is most likely unnecessary on any currently used hardware, the byte copy is necessary from what I know on IA64 and friends so leave it. Add a new API entry point which lets a driver select the old behaviour if such a needs is ever found. This gives me ~20% speed up on startup on 945 hardware.
128 lines
2.6 KiB
C
128 lines
2.6 KiB
C
/*******************************************************************************
|
|
for Alpha Linux
|
|
*******************************************************************************/
|
|
|
|
/*
|
|
* 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)
|
|
*
|
|
*/
|
|
|
|
#ifdef HAVE_XORG_CONFIG_H
|
|
#include <xorg-config.h>
|
|
#endif
|
|
|
|
#include <X11/X.h>
|
|
#include "xf86.h"
|
|
#include "xf86Priv.h"
|
|
#include "xf86_OSlib.h"
|
|
#include "compiler.h"
|
|
|
|
static int really_slow_bcopy;
|
|
|
|
_X_EXPORT void
|
|
xf86SetReallySlowBcopy(void)
|
|
{
|
|
really_slow_bcopy = 1;
|
|
}
|
|
|
|
#if defined(__i386__) || defined(__x86_64__)
|
|
static void xf86_really_slow_bcopy(unsigned char *src, unsigned char *dst, int len)
|
|
{
|
|
while(len--)
|
|
{
|
|
*dst++ = *src++;
|
|
outb(0x80, 0x00);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/* The outb() isn't needed on my machine, but who knows ... -- ost */
|
|
_X_EXPORT void
|
|
xf86SlowBcopy(unsigned char *src, unsigned char *dst, int len)
|
|
{
|
|
#if defined(__i386__) || defined(__x86_64__)
|
|
if (really_slow_bcopy) {
|
|
xf86_really_slow_bcopy(src, dst, len);
|
|
return;
|
|
}
|
|
#endif
|
|
while(len--)
|
|
*dst++ = *src++;
|
|
}
|
|
|
|
#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
|
|
|
|
_X_EXPORT 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);
|
|
}
|
|
|
|
_X_EXPORT 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
|