117 lines
2.4 KiB
C
117 lines
2.4 KiB
C
/*******************************************************************************
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for Alpha Linux
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*******************************************************************************/
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/*
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* Create a dependency that should be immune from the effect of register
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* renaming as is commonly seen in superscalar processors. This should
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* insert a minimum of 100-ns delays between reads/writes at clock rates
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* up to 100 MHz---GGL
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*
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* Slowbcopy(char *src, char *dst, int count)
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*
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*/
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#ifdef HAVE_XORG_CONFIG_H
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#include <xorg-config.h>
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#endif
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#include <X11/X.h>
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#include "xf86.h"
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#include "xf86Priv.h"
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#include "xf86_OSlib.h"
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#include "compiler.h"
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static int really_slow_bcopy;
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void
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xf86SetReallySlowBcopy(void)
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{
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really_slow_bcopy = 1;
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}
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#if defined(__i386__) || defined(__amd64__)
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static void
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xf86_really_slow_bcopy(unsigned char *src, unsigned char *dst, int len)
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{
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while (len--) {
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*dst++ = *src++;
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outb(0x80, 0x00);
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}
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}
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#endif
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/* The outb() isn't needed on my machine, but who knows ... -- ost */
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void
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xf86SlowBcopy(unsigned char *src, unsigned char *dst, int len)
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{
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#if defined(__i386__) || defined(__amd64__)
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if (really_slow_bcopy) {
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xf86_really_slow_bcopy(src, dst, len);
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return;
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}
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#endif
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while (len--)
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*dst++ = *src++;
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}
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#ifdef __alpha__
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#ifdef linux
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unsigned long _bus_base(void);
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#define useSparse() (!_bus_base())
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#define SPARSE (7)
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#else
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#define useSparse() 0
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#define SPARSE 0
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#endif
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void
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xf86SlowBCopyFromBus(unsigned char *src, unsigned char *dst, int count)
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{
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if (useSparse()) {
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unsigned long addr;
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long result;
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addr = (unsigned long) src;
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while (count) {
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result = *(volatile int *) addr;
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result >>= ((addr >> SPARSE) & 3) * 8;
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*dst++ = (unsigned char) (0xffUL & result);
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addr += 1 << SPARSE;
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count--;
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outb(0x80, 0x00);
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}
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}
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else
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xf86SlowBcopy(src, dst, count);
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}
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void
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xf86SlowBCopyToBus(unsigned char *src, unsigned char *dst, int count)
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{
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if (useSparse()) {
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unsigned long addr;
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addr = (unsigned long) dst;
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while (count) {
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*(volatile unsigned int *) addr =
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(unsigned short) (*src) * 0x01010101;
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src++;
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addr += 1 << SPARSE;
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count--;
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outb(0x80, 0x00);
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}
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}
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else
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xf86SlowBcopy(src, dst, count);
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}
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#endif
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