4ee0a53de8
new license. If we want to, later we can import 4.4RC3 again and pick
up the files that have the new license, but for now the vendor branch
is "pure."
111 lines
2.4 KiB
C
111 lines
2.4 KiB
C
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/* $XConsortium: SlowBcopy.c /main/1 1996/05/07 17:14:10 kaleb $ */
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/*******************************************************************************
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for Alpha Linux
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*******************************************************************************/
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/* $XFree86: xc/programs/Xserver/hw/xfree86/os-support/misc/SlowBcopy.c,v 1.7 2004/02/11 22:06:21 tsi Exp $ */
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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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#include "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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/* 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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while(len--)
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{
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*dst++ = *src++;
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#if !defined(__sparc__) && \
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!defined(__powerpc__) && \
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!defined(__mips__) && \
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!defined(__ia64__)
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outb(0x80, 0x00);
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#endif
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}
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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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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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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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