9719354ae0
Spiritual revert of 1fa4de80fc. Intel's C
compiler claims to be gcc-compatible; if they're not defining the same
macros as gcc then that's their bug, not ours. Even if we were to do
this aliasing we should do it once and for all in servermd.h.
128 lines
2.6 KiB
C
128 lines
2.6 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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_X_EXPORT 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 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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{
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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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_X_EXPORT 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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/*
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* The Jensen lacks dense memory, thus we have to address the bus via
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* the sparse addressing scheme. Time critical code uses routines from
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* BUSmemcpy.c
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*
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* Martin Ostermann (ost@comnets.rwth-aachen.de) - Apr.-Sep. 1996
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*/
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#ifdef linux
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unsigned long _bus_base(void);
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#ifdef TEST_JENSEN_CODE /* define to test the Sparse addressing on a non-Jensen */
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#define SPARSE (5)
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#else
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#define SPARSE (7)
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#endif
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#define isJensen() (!_bus_base())
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#else
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#define isJensen() 0
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#define SPARSE 0
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#endif
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_X_EXPORT void
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xf86SlowBCopyFromBus(unsigned char *src, unsigned char *dst, int count)
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{
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if (isJensen())
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{
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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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_X_EXPORT void
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xf86SlowBCopyToBus(unsigned char *src, unsigned char *dst, int count)
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{
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if (isJensen())
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{
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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 = (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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