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https://github.com/X11Libre/xserver.git
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ba870af892
This had been introduced almost two decades ago, by Dave Airlie (*1) along
with some major IO speed improvement, just in case some driver still needed
the old behaviour - in that case it would call xf86SetReallySlowBcopy(),
so xf86SlowBcopy() would fall back to the old approach emitting an extra
outb() on debug port, in order to slow things down more.
Now aeons have passed and there doesn't seem to be any actual user for this,
so it's time to drop that ancient relic.
*1) commit e717eb82dc
Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>
Part-of: <https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/1402>
92 lines
2.0 KiB
C
92 lines
2.0 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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/* 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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*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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