-
Notifications
You must be signed in to change notification settings - Fork 0
/
K6INIT.C
548 lines (407 loc) · 14.1 KB
/
K6INIT.C
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
#include <string.h>
#include <malloc.h>
#include <dos.h>
#include "k6.h"
int checkAuthenticAMD(void)
{
char cpuidString[12+1]; // 3 DWORDs + 1 null term byte
cpuidString[12] = 0x00; // null terminator
k6_getCPUIdentifier((char _far*)cpuidString);
printf("CPU ID String: %s\n", cpuidString);
return(memcmp(cpuidString, "AuthenticAMD", 12) == 0);
}
int getSupportedCPUType(void)
{
cpuidProcessorType cpu;
cpu = k6_getCPUProcessorType();
printf("CPU Family %02lx model %02lx stepping %02lx\n",
cpu.family,
cpu.model,
cpu.stepping);
// Supported CPUs
// Family Model Stepping
// 5 8 C AMD K6-2(CXT)
// 5 9 -- AMD K6-III
// 5 D -- AMD K6-2+ / K6-III+
if (cpu.family != 5) {
printf("Unsupported CPU family!\n");
return k6_processorTypeNONE;
}
if (cpu.model == 0x08 && cpu.stepping == 0x0C) {
printf("AMD K6-2 (CXT) detected!\n");
return k6_processorTypeCXT;
} else if (cpu.model == 0x09) {
printf("AMD K6-III detected!\n");
return k6_processorTypeK6_3;
} else if (cpu.model == 0x0D) {
printf("AMD K6-2+ / K6-III+ detected!\n");
return k6_processorTypePLUS;
} else {
printf("Unsupported CPU Model / Stepping!\n");
return k6_processorTypeNONE;
}
}
static int isKnownLFB(unsigned long *lfbList, unsigned long lfbToCheck)
{
int i;
for (i = 0; i < k6_maximumMTRRCount; i++) {
if (lfbList[i] == lfbToCheck) {
return 1;
}
}
return 0;
}
static int findLFBs(mtrrConfigInfo *mtrrConfig)
{
vbeInfo *vbeInfoPtr;
vbeModeInfo *vbeModeInfoPtr;
unsigned short ret;
int vbeVersionMajor, vbeVersionMinor;
char oemVersionString[16+1];
unsigned short i;
unsigned short currentMode;
unsigned long videoMemorySize = 0UL;
int foundLFB = 0;
// Allocate memory for VBE (Mode) Info structures
vbeInfoPtr = malloc(sizeof(vbeInfo));
vbeModeInfoPtr = malloc(sizeof(vbeModeInfo));
// Do some sanity checks first.
if ((vbeInfoPtr == NULL) || (vbeModeInfoPtr == NULL)) {
printf("ERROR> could not allocate memory for VBE Info Structures.\n");
goto error;
}
if (mtrrConfig == NULL) {
printf("mtrrConfig is NULL! Aborting...\n");
goto error;
}
if (mtrrConfig->mtrrCount == k6_maximumMTRRCount) {
printf("No more Write Combine / MTRR slots available!");
goto error;
}
printf("Attempting to find Linear Frame Buffer (LFB) region(s)...\n");
printf("Probing VGA BIOS for VBE support...\n\n");
// Init the memory
memset(vbeInfoPtr, 0, sizeof(vbeInfo));
memset(vbeModeInfoPtr, 0, sizeof(vbeModeInfo));
memset(oemVersionString, 0, sizeof(oemVersionString));
// A VBE Info Block request must happen with the target block's
// Signature field set to "VBE2"
memcpy(vbeInfoPtr->vbeSignature, "VBE2", 4);
ret = k6_getVBEInfoBlock(vbeInfoPtr);
if (ret != 0x004F) {
printf("VESA call failed. Cannot automatically find LFBs.\n");
goto error;
}
vbeVersionMajor = vbeInfoPtr->vbeVersion >> 8;
vbeVersionMinor = vbeInfoPtr->vbeVersion & 0xFF;
printf("VESA BIOS found, Signature: %.4s, VESA Version %.1x.%02x\n",
vbeInfoPtr->vbeSignature,
vbeVersionMajor,
vbeVersionMinor);
videoMemorySize = ((unsigned long) vbeInfoPtr->totalMemory) * 65536UL;
printf("Total video memory: %lu Bytes\n", videoMemorySize);
// Copy out OEM version string (Yay far pointers)
_fstrncpy((char _far*)oemVersionString,
(char _far*) vbeInfoPtr->oemStringPtr,
16);
printf("VESA BIOS OEM Version String: %s\n", oemVersionString);
// If we have VESA version before 2.xx, we have to stop because
// VESA only introduced LFBs starting at 2.xx.
if (vbeVersionMajor < 2) {
printf("VBE Version before 2.00. No LFB detection possible.\n");
goto error;
}
// Query all video modes to find those with LFBs.
printf("Querying VESA modes to find LFB address...\n\n");
for (i = 0; vbeInfoPtr->videoModeListPtr[i] != 0xFFFF; i++) {
if (i > vbeMaximumModeEntries) {
break;
}
currentMode = vbeInfoPtr->videoModeListPtr[i];
ret = k6_getVBEModeInfo(currentMode,
(vbeModeInfo _far*) vbeModeInfoPtr);
// ret = return code from query call
/*
TODO: Add loglevel based debug print function
printf("ret: %04hx - Resolution: %ux%u - BPP: %u - Attr: %04x\n",
ret,
vbeModeInfoPtr->width,
vbeModeInfoPtr->height,
vbeModeInfoPtr->bpp,
*(unsigned short*) &vbeModeInfoPtr->attributes);
*/
// check if current mode has LFB capability
if (vbeModeInfoPtr->attributes.hasLFB) {
// we support a maximum of two LFB regions
// (there are two MTRRs on the supported CPUs)
// If this mode has not yet a known LFB address, save it.
if (!isKnownLFB(mtrrConfig->mtrrs, vbeModeInfoPtr->framebuffer)) {
printf("Found LFB%d at address %08lx.\n",
foundLFB,
vbeModeInfoPtr->framebuffer);
mtrrConfigInfoAppend(mtrrConfig, vbeModeInfoPtr->framebuffer,
videoMemorySize);
foundLFB++;
}
// If we exceed two LFBs, we stop processing the VESA modes.
if (mtrrConfig->mtrrCount == k6_maximumMTRRCount) {
break;
}
}
}
free(vbeModeInfoPtr);
free(vbeInfoPtr);
return foundLFB;
// TODO: Make this more elegant :/
error:
free(vbeModeInfoPtr);
free(vbeInfoPtr);
return -1;
}
static unsigned long getMTRRRangeForSize(unsigned long size)
{
// 15 bit mask
/*
111 1111 1111 1111 128K
111 1111 1111 1110 256K
111 1111 1111 1100 512K
111 1111 1111 1000 1M
...
100 0000 0000 0000 2G
000 0000 0000 0000 4G
*/
unsigned long mask = 0xFFFFFFFFUL;
unsigned long shiftReference = 128UL * 1024UL;
/*
Shift the reference of 128K left (doubling it with each step
and along with it the mask, until this reference is bigger
than the requested size. The result & 7FFF is our mask.
*/
while(shiftReference < size) {
mask <<= 1UL;
shiftReference <<= 1UL;
}
mask &= 0x00007FFFUL;
return mask;
}
static int setupMTRRs(mtrrConfigInfo *mtrrConfig)
{
unsigned short i = 0;
unsigned long mtrrValue = 0UL;
unsigned long mtrrMask = 0UL;
unsigned long mtrrAddress = 0UL;
if (mtrrConfig == NULL) {
printf("mtrrConfig is NULL! Aborting...\n");
return 0;
}
for (i = 0; i < mtrrConfig->mtrrCount; i++) {
mtrrValue = 0UL;
// Set MTRR to Write Combining Memory Type (bit 1)
mtrrValue |= 0x00000002UL;
// Set Physical Base Address (bits 17 - 31)
// Most significant 15 bits of the physical address.
mtrrAddress = mtrrConfig->mtrrs[i];
mtrrValue |= mtrrAddress & 0xFFFE0000UL;
// Set Physical Address Mask (bits 2 - 16)
mtrrMask = getMTRRRangeForSize(mtrrConfig->mtrrSizes[i]);
mtrrMask <<= 2UL;
mtrrValue |= mtrrMask;
printf("Configuring MTRR%u: %08lx, size %lu -> %08lx \n",
i,
mtrrConfig->mtrrs[i],
mtrrConfig->mtrrSizes[i],
mtrrValue);
// Now configure actual MTRR register
k6_setMTRR(i, mtrrValue);
}
// Newline for readability
printf("\n");
return 1;
}
void mtrrConfigInfoAppend(mtrrConfigInfo *dst,
unsigned long address,
unsigned long size)
// Adds a MTRR Write combine range to the mtrrConfigInfo struct.
{
if (dst == NULL)
return;
if (dst->mtrrCount == k6_maximumMTRRCount) {
printf("Attempting to add MTRR range but maximum MTRR count already reached!\n");
return;
}
dst->mtrrs[dst->mtrrCount] = address;
dst->mtrrSizes[dst->mtrrCount] = size;
dst->mtrrCount++;
}
int configureWriteCombining(mtrrConfigInfo *mtrrsToConfigure,
int doLfbScan)
// Configures Write Combining with the given parameters in mtrrsToConfigure.
// if doLfbScan = 1 then the VESA BIOS will be probed for the LFB region.
// this is the default behavior.
// returns -1 or 0 on error.
{
int vbeLFBCount = 0;
if (mtrrsToConfigure == NULL) {
printf("mtrrsToConfigure NULL pointer!!\n");
return 0;
}
// If doLfbScan is set, we scan for LFBs via VBE
if (doLfbScan) {
vbeLFBCount = findLFBs(mtrrsToConfigure);
if (vbeLFBCount >= 0) {
printf("LFB MTRRs configured via VESA BIOS: %u\n", vbeLFBCount);
} else {
// Error condition
printf("ERROR probing VESA BIOS! Cannot auto-detect LFB!\n");
}
}
// Newline for readability's sake...
printf("\n");
// Now we setup the MTRRs in the CPU.
return setupMTRRs(mtrrsToConfigure);
}
void disableWriteCombining(void)
// Disable write combining completely by overwriting MTRRs
// with zero.
{
int i;
printf("Disabling Write Combining (overwriting MTRRs)\n");
for (i = 0; i < k6_maximumMTRRCount; i++) {
k6_setMTRR(i, 0x00000000UL);
}
}
unsigned long getMemorySize(void)
{
// Basically a wrapper function for k6_getMemorySize
// which is cumbersome to use.
// The reason for that is that asm PROCs cannot return
// 32-bit values for some reason. Old compilers innit'
unsigned long memSizeBelow16M = 0UL;
unsigned long memSizeAbove16M = 0UL;
unsigned long memSizeTotal = 0UL;
unsigned short ret;
ret = k6_getMemorySize((unsigned long _far*) &memSizeBelow16M,
(unsigned long _far*) &memSizeAbove16M);
if (!ret) {
return 0;
}
if (memSizeAbove16M == 0) {
// If we have <=16MB
memSizeTotal = memSizeBelow16M + (1UL * 1024UL * 1024UL);
} else {
memSizeTotal = memSizeAbove16M + (16UL * 1024UL * 1024UL);
}
return memSizeTotal;
}
static int hasMemoryHole(void)
// This function finds out whether or not we have
// a 15-16M memory hole.
// -1 = error
{
unsigned long memSizeBelow16M = 0UL;
unsigned long memSizeAbove16M = 0UL;
unsigned short ret;
ret = k6_getMemorySize((unsigned long _far*) &memSizeBelow16M,
(unsigned long _far*) &memSizeAbove16M);
if (!ret) {
return -1;
}
// If the 15M memory area from 1 - 16 MB is actually 14M or less,
// we assume a memory hole.
return (memSizeBelow16M <= (14UL * 1024UL * 1024UL));
}
void showMemoryInfo(void)
// Displays Memory Size and 15M-16M-Hole information.
{
unsigned long memorySize = 0UL;
int memoryHole = 0;
memorySize = getMemorySize();
printf("\n");
if (memorySize == 0) {
printf("ERROR OBTAINING SYSTEM MEMORY INFORMATION!!\n\n");
return;
}
memorySize >>= 10UL;
memoryHole = hasMemoryHole();
printf("System memory information:\n");
printf(" Installed system Memory: %lu KiB\n", memorySize);
printf(" Has 15M-16M Memory Hole: ");
if (memoryHole) {
printf("YES\n");
} else if (memoryHole == 0) {
printf("NO\n");
} else {
printf("ERROR.\n");
}
printf("\n");
}
void setWriteAllocateManual(unsigned long writeAllocateMemorySize,
int enableForMemoryHole)
// Sets write allocation for the given parameters
// The size is in bytes.
{
// 4 MiB mask: 0xFFC00000
// Memory hole bit: 0x00010000
unsigned long writeAllocateReg = writeAllocateMemorySize & 0xFFC00000UL;
printf("Enabling Write Allocate for 1 - %lu MiB, ",
writeAllocateReg >> 20UL);
if (enableForMemoryHole) {
writeAllocateReg |= 0x00010000UL;
printf("including area between 15-16M.\n");
} else {
printf("excluding 15-16M memory hole.\n");
}
printf("Setting Write Allocate WHCR Register: %08lx\n", writeAllocateReg);
k6_setWriteAllocate(writeAllocateReg);
}
void setWriteAllocateForSystemRAM(void)
// Attempts to auto-detect the available sytem memory and sets up Write
// Allocate for it. This function is called by default
{
unsigned long writeAllocateMemorySize;
int systemHasMemoryHole;
writeAllocateMemorySize = getMemorySize();
systemHasMemoryHole = hasMemoryHole();
// Leave if we have an error in detection
if ((writeAllocateMemorySize == 0) || (systemHasMemoryHole < 0)) {
printf("ERROR getting memory info! Not setting Write allocate.\n");
return;
}
// Make sure to negate the memory hole var, since it needs to be 1 if
// we DON'T have a memory hole to enable write allocate for the 15-16M
// region!!
setWriteAllocateManual(writeAllocateMemorySize, !systemHasMemoryHole);
}
void setWriteOrderMode(int writeOrderMode)
// Sets the write order mode.
// See k6init.h for parameter values.
{
if ((writeOrderMode < 0) || (writeOrderMode > 2)) {
printf("Invalid Write Order Mode value.\n");
return;
}
printf("Setting Write Order mode to '%s' (%d)\n",
k6_writeOrderModeStrings[writeOrderMode],
writeOrderMode);
k6_setWriteOrderMode(writeOrderMode);
}
void setMultiplier(unsigned short multiplierValueIndex)
// Sets the multiplier value by manipulating the Enhanced Power Management
// (EPM) I/O block. This only works on AMD K6-2+/K6-III+ CPUs.
{
unsigned short multiplierValue = BADMUL;
if (multiplierValueIndex >= (sizeof(k6_multiplierValues) / sizeof(unsigned short))) {
printf("Invalid multiplier value.\n");
return;
}
multiplierValue = k6_multiplierValues[multiplierValueIndex];
if (multiplierValue == BADMUL) {
printf("Invalid multiplier value.\n");
return;
}
// Write the value to the CPU
printf("Writing multiplier value %04hx to CPU.\n\n", multiplierValue);
k6_toggleEPMIOBlock(1);
k6_setMultiplier(multiplierValue);
k6_toggleEPMIOBlock(0);
}