1*4882a593Smuzhiyun /*******************************************************************************
2*4882a593Smuzhiyun for Alpha Linux
3*4882a593Smuzhiyun *******************************************************************************/
4*4882a593Smuzhiyun
5*4882a593Smuzhiyun /*
6*4882a593Smuzhiyun * Create a dependency that should be immune from the effect of register
7*4882a593Smuzhiyun * renaming as is commonly seen in superscalar processors. This should
8*4882a593Smuzhiyun * insert a minimum of 100-ns delays between reads/writes at clock rates
9*4882a593Smuzhiyun * up to 100 MHz---GGL
10*4882a593Smuzhiyun *
11*4882a593Smuzhiyun * Slowbcopy(char *src, char *dst, int count)
12*4882a593Smuzhiyun *
13*4882a593Smuzhiyun */
14*4882a593Smuzhiyun
15*4882a593Smuzhiyun #ifdef HAVE_XORG_CONFIG_H
16*4882a593Smuzhiyun #include <xorg-config.h>
17*4882a593Smuzhiyun #endif
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun #include <X11/X.h>
20*4882a593Smuzhiyun #include "xf86.h"
21*4882a593Smuzhiyun #include "xf86Priv.h"
22*4882a593Smuzhiyun #include "xf86_OSlib.h"
23*4882a593Smuzhiyun #include "compiler.h"
24*4882a593Smuzhiyun
25*4882a593Smuzhiyun static int really_slow_bcopy;
26*4882a593Smuzhiyun
27*4882a593Smuzhiyun void
xf86SetReallySlowBcopy(void)28*4882a593Smuzhiyun xf86SetReallySlowBcopy(void)
29*4882a593Smuzhiyun {
30*4882a593Smuzhiyun really_slow_bcopy = 1;
31*4882a593Smuzhiyun }
32*4882a593Smuzhiyun
33*4882a593Smuzhiyun #if defined(__i386__) || defined(__amd64__)
34*4882a593Smuzhiyun static void
xf86_really_slow_bcopy(unsigned char * src,unsigned char * dst,int len)35*4882a593Smuzhiyun xf86_really_slow_bcopy(unsigned char *src, unsigned char *dst, int len)
36*4882a593Smuzhiyun {
37*4882a593Smuzhiyun while (len--) {
38*4882a593Smuzhiyun *dst++ = *src++;
39*4882a593Smuzhiyun outb(0x80, 0x00);
40*4882a593Smuzhiyun }
41*4882a593Smuzhiyun }
42*4882a593Smuzhiyun #endif
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun /* The outb() isn't needed on my machine, but who knows ... -- ost */
45*4882a593Smuzhiyun void
xf86SlowBcopy(unsigned char * src,unsigned char * dst,int len)46*4882a593Smuzhiyun xf86SlowBcopy(unsigned char *src, unsigned char *dst, int len)
47*4882a593Smuzhiyun {
48*4882a593Smuzhiyun #if defined(__i386__) || defined(__amd64__)
49*4882a593Smuzhiyun if (really_slow_bcopy) {
50*4882a593Smuzhiyun xf86_really_slow_bcopy(src, dst, len);
51*4882a593Smuzhiyun return;
52*4882a593Smuzhiyun }
53*4882a593Smuzhiyun #endif
54*4882a593Smuzhiyun while (len--)
55*4882a593Smuzhiyun *dst++ = *src++;
56*4882a593Smuzhiyun }
57*4882a593Smuzhiyun
58*4882a593Smuzhiyun #ifdef __alpha__
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun #ifdef __linux__
61*4882a593Smuzhiyun
62*4882a593Smuzhiyun unsigned long _bus_base(void);
63*4882a593Smuzhiyun
64*4882a593Smuzhiyun #define useSparse() (!_bus_base())
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun #define SPARSE (7)
67*4882a593Smuzhiyun
68*4882a593Smuzhiyun #else
69*4882a593Smuzhiyun
70*4882a593Smuzhiyun #define useSparse() 0
71*4882a593Smuzhiyun
72*4882a593Smuzhiyun #define SPARSE 0
73*4882a593Smuzhiyun
74*4882a593Smuzhiyun #endif
75*4882a593Smuzhiyun
76*4882a593Smuzhiyun void
xf86SlowBCopyFromBus(unsigned char * src,unsigned char * dst,int count)77*4882a593Smuzhiyun xf86SlowBCopyFromBus(unsigned char *src, unsigned char *dst, int count)
78*4882a593Smuzhiyun {
79*4882a593Smuzhiyun if (useSparse()) {
80*4882a593Smuzhiyun unsigned long addr;
81*4882a593Smuzhiyun long result;
82*4882a593Smuzhiyun
83*4882a593Smuzhiyun addr = (unsigned long) src;
84*4882a593Smuzhiyun while (count) {
85*4882a593Smuzhiyun result = *(volatile int *) addr;
86*4882a593Smuzhiyun result >>= ((addr >> SPARSE) & 3) * 8;
87*4882a593Smuzhiyun *dst++ = (unsigned char) (0xffUL & result);
88*4882a593Smuzhiyun addr += 1 << SPARSE;
89*4882a593Smuzhiyun count--;
90*4882a593Smuzhiyun outb(0x80, 0x00);
91*4882a593Smuzhiyun }
92*4882a593Smuzhiyun }
93*4882a593Smuzhiyun else
94*4882a593Smuzhiyun xf86SlowBcopy(src, dst, count);
95*4882a593Smuzhiyun }
96*4882a593Smuzhiyun
97*4882a593Smuzhiyun void
xf86SlowBCopyToBus(unsigned char * src,unsigned char * dst,int count)98*4882a593Smuzhiyun xf86SlowBCopyToBus(unsigned char *src, unsigned char *dst, int count)
99*4882a593Smuzhiyun {
100*4882a593Smuzhiyun if (useSparse()) {
101*4882a593Smuzhiyun unsigned long addr;
102*4882a593Smuzhiyun
103*4882a593Smuzhiyun addr = (unsigned long) dst;
104*4882a593Smuzhiyun while (count) {
105*4882a593Smuzhiyun *(volatile unsigned int *) addr =
106*4882a593Smuzhiyun (unsigned short) (*src) * 0x01010101;
107*4882a593Smuzhiyun src++;
108*4882a593Smuzhiyun addr += 1 << SPARSE;
109*4882a593Smuzhiyun count--;
110*4882a593Smuzhiyun outb(0x80, 0x00);
111*4882a593Smuzhiyun }
112*4882a593Smuzhiyun }
113*4882a593Smuzhiyun else
114*4882a593Smuzhiyun xf86SlowBcopy(src, dst, count);
115*4882a593Smuzhiyun }
116*4882a593Smuzhiyun #endif
117