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Documented GVF_SAVE_VAR alongside other flags, and removed a query/doubt
[AROS.git] / arch / ppc-sam440 / kernel / kernel_startup.c
blobd6137930fa0137a2702308d2f79713b07ef676ce
1 /*
2 Copyright © 1995-2014, The AROS Development Team. All rights reserved.
3 $Id$
4 */
5
6 #define DEBUG 1
7
8 #include <aros/kernel.h>
9 #include <aros/libcall.h>
10 #include <aros/symbolsets.h>
11 #include <inttypes.h>
12 #include <exec/libraries.h>
13 #include <exec/execbase.h>
14 #include <aros/debug.h>
15 #include <exec/memory.h>
16 #include "memory.h"
17 #include <utility/tagitem.h>
18 #include <asm/amcc440.h>
19 #include <asm/io.h>
20 #include <strings.h>
21
22 #include <proto/exec.h>
23
24 #include LC_LIBDEFS_FILE
25 #include <kernel_romtags.h>
26 #include "kernel_intern.h"
27
28 /* forward declarations */
29 static void __attribute__((used)) kernel_cstart(struct TagItem *msg);
30
31 extern void exec_main(struct TagItem *msg, void *entry);
32
33 /* A very very very.....
34 * ... very ugly code.
35 *
36 * The AROS kernel gets executed at this place. The stack is unknown here, might be
37 * set properly up, might be totally broken aswell and thus one cannot trust the contents
38 * of %r1 register. Even worse, the kernel has been relocated most likely to some virtual
39 * address and the MMU mapping might not be ready now.
40 *
41 * The strategy is to create one MMU entry first, mapping first 16MB of ram into last 16MB
42 * of address space in one turn and then making proper MMU map once the bss sections are cleared
43 * and the startup routine in C is executed. This "trick" assumes two evil things:
44 * - the kernel will be loaded (and will fit completely) within first 16MB of RAM, and
45 * - the kernel will be mapped into top (last 16MB) of memory.
46 *
47 * Yes, I'm evil ;)
48 */
49
50 asm(".section .aros.init,\"ax\"\n\t"
51 ".globl start\n\t"
52 ".type start,@function\n"
53 "start:\n\t"
54 "mr %r29,%r3\n\t" /* Don't forget the message */
55 "lis %r5,0x4152\n\t" /* Load AROS magic value */
56 "ori %r5,%r5,0x4f53\n\t"
57 "cmpw %r5,%r4\n\t" /* Check if it was passed as 2nd parameter */
58 "bnelr\n\t" /* No, then return to caller */
59 "lis %r9,0xff00\n\t" /* Virtual address 0xff000000 */
60 "li %r10,0\n\t" /* Physical address 0x00000000 */
61 "ori %r9,%r9,0x0270\n\t" /* 16MB page. Valid one */
62 "li %r11,0x043f\n\t" /* Write through cache. RWX enabled :) */
63 "li %r0,0\n\t" /* TLB entry number 0 */
64 "tlbwe %r9,%r0,0\n\t"
65 "tlbwe %r10,%r0,1\n\t"
66 "tlbwe %r11,%r0,2\n\t"
67 "isync\n\t" /* Invalidate shadow TLB's */
68 "li %r9,0; mttbl %r9; mttbu %r9; mttbl %r9\n\t"
69 "lis %r9,tmp_stack_end@ha\n\t" /* Use temporary stack while clearing BSS */
70 "lwz %r1,tmp_stack_end@l(%r9)\n\t"
71 "bl __clear_bss_tagged\n\t" /* Clear 'em ALL!!! */
72 "lis %r11,target_address@ha\n\t" /* Load the address of init code in C */
73 "mr %r3,%r29\n\t" /* restore the message */
74 "lwz %r11,target_address@l(%r11)\n\t"
75 "lis %r9,stack_end@ha\n\t" /* Use brand new stack to do evil things */
76 "mtctr %r11\n\t"
77 "lwz %r1,stack_end@l(%r9)\n\t"
78 "bctr\n\t" /* And start the game... */
79 ".string \"Native/CORE v3 (" __DATE__ ")\""
80 "\n\t.text\n\t"
81 );
82
83 static void __attribute__((used)) __clear_bss_tagged(struct TagItem *msg)
84 {
85 struct KernelBSS *bss = (struct KernelBSS *) krnGetTagData(KRN_KernelBss, 0, msg);
86
87 __clear_bss(bss);
88 }
89
90 static union {
91 struct TagItem bootup_tags[64];
92 uint32_t tmp_stack [128];
93 } tmp_struct __attribute__((used, section(".data"), aligned(16)));
94 static const uint32_t *tmp_stack_end __attribute__((used, section(".text"))) = &tmp_struct.tmp_stack[124];
95 static uint32_t stack[STACK_SIZE] __attribute__((used, aligned(16)));
96 static const uint32_t *stack_end __attribute__((used, section(".text"))) = &stack[STACK_SIZE-4];
97 static const void *target_address __attribute__((used, section(".text"))) = (void*)kernel_cstart;
98 static char CmdLine[200] __attribute__((used));
99
100 struct MinList *modlist;
101 uintptr_t memlo;
102 struct ExecBase *SysBase;
103
104 static uint32_t exec_SelectMbs440(uint32_t bcr)
105 {
106 uint32_t val;
107
108 wrdcr(SDRAM0_CFGADDR, bcr);
109 val = rddcr(SDRAM0_CFGDATA);
110
111 switch (val & SDRAM_SDSZ_MASK)
112 {
113 case SDRAM_SDSZ_256MB: return 256;
114 case SDRAM_SDSZ_128MB: return 128;
115 case SDRAM_SDSZ_64MB: return 64;
116 case SDRAM_SDSZ_32MB: return 32;
117 case SDRAM_SDSZ_16MB: return 16;
118 case SDRAM_SDSZ_8MB: return 8;
119 }
120
121 return 0;
122 }
123
124 static uint32_t exec_SelectMbs460(uint32_t val)
125 {
126 D(bug("[%s] DCR 0x%08x\n", __func__, val));
127 switch (val & MQ0_BASSZ_MASK)
128 {
129 case MQ0_BASSZ_4096MB: return 4096;
130 case MQ0_BASSZ_2048MB: return 2048;
131 case MQ0_BASSZ_1024MB: return 1024;
132 case MQ0_BASSZ_512MB: return 512;
133 case MQ0_BASSZ_256MB: return 256;
134 case MQ0_BASSZ_128MB: return 128;
135 case MQ0_BASSZ_64MB: return 64;
136 case MQ0_BASSZ_32MB: return 32;
137 case MQ0_BASSZ_16MB: return 16;
138 case MQ0_BASSZ_8MB: return 8;
139 }
140
141 return 0;
142 }
143
144 /* Detect and report amount of available memory in mega bytes via device control register bus */
145 static uint32_t exec_GetMemory()
146 {
147 uint32_t mem = 0;
148 uint32_t pvr = rdspr(PVR);
149
150 if (krnIsPPC440(pvr)) {
151 mem += exec_SelectMbs440(SDRAM0_B0CR);
152 mem += exec_SelectMbs440(SDRAM0_B1CR);
153 mem += exec_SelectMbs440(SDRAM0_B2CR);
154 mem += exec_SelectMbs440(SDRAM0_B3CR);
155 } else if (krnIsPPC460(pvr)) {
156 /* Hmm. Probably a 460EX */
157 mem += exec_SelectMbs460(rddcr(MQ0_B0BAS));
158 mem += exec_SelectMbs460(rddcr(MQ0_B1BAS));
159 mem += exec_SelectMbs460(rddcr(MQ0_B2BAS));
160 mem += exec_SelectMbs460(rddcr(MQ0_B3BAS));
161 } else {
162 bug("Memory: Unrecognized PVR model 0x%08x\n", pvr);
163 bug("Memory: Assuming you have 64M of RAM\n");
164 mem = 64;
165 }
166
167 return mem;
168 }
169
170 void exec_main(struct TagItem *msg, void *entry)
171 {
172 UWORD *memrange[3];
173 uint32_t mem, krnLowest, krnHighest, memLowest;
174 struct MemHeader *mh;
175
176 D(bug("[exec] AROS for Sam440 - The AROS Research OS\n"));
177
178 /* Prepare the exec base */
179 D(bug("[exec] Preparing the ExecBase...\n"));
180
181 /* Get the kernel memory locations */
182 krnLowest = krnGetTagData(KRN_KernelLowest, 0, msg);
183 krnHighest = krnGetTagData(KRN_KernelHighest, 0, msg);
184
185 memLowest = (krnHighest + 0xffff) & 0xffff0000;
186
187 D(bug("[exec] Kernel and romtags: @%p - %p\n", krnLowest, krnHighest));
188 D(bug("[exec] Create memory header @%p - %p\n", memLowest, 0x01000000-1));
189 krnCreateMemHeader("RAM", -10, (APTR)(memLowest), 0x01000000 - (IPTR)memLowest,
190 MEMF_CHIP | MEMF_PUBLIC | MEMF_KICK | MEMF_LOCAL | MEMF_24BITDMA);
191
192 memrange[0] = (UWORD *)(krnLowest + 0xff000000);
193 memrange[1] = (UWORD *)(krnHighest + 0xff000000);
194 memrange[2] = (UWORD *)-1;
195
196 mh = (struct MemHeader *)memLowest;
197
198 D(bug("[exec] Prepare exec base in %p\n", mh));
199 krnPrepareExecBase(memrange, mh, msg);
200 D(bug("[exec] ExecBase at %08x\n", SysBase));
201
202 /* Set up %r2 to point to SysBase
203 * For now, this is only used by the mmu_handler
204 * to patch up the damage that Parthenope does
205 * when it loads modules, and assumes that
206 * &SysBase == (void **)4;
207 */
208 asm volatile ("mr %%r2, %0\n" :: "r"(SysBase));
209
210 mem = exec_GetMemory();
211 D(bug("[exec] Adding memory (%uM)\n", mem));
212
213 AddMemList((mem - 16) * 1024*1024,
214 MEMF_FAST | MEMF_PUBLIC | MEMF_KICK | MEMF_LOCAL,
215 0,
216 (APTR)0x01000000,
217 "Fast RAM");
218
219 D(bug("[exec] InitCode(RTF_SINGLETASK)\n"));
220 InitCode(RTF_SINGLETASK, 0);
221
222 D(bug("[exec] InitCode(RTF_COLDSTART)\n"));
223 InitCode(RTF_COLDSTART, 0);
224
225 D(bug("[exec] I should never get here...\n"));
226 }
227
228
229 static void __attribute__((used)) kernel_cstart(struct TagItem *msg)
230 {
231 struct TagItem *tmp = tmp_struct.bootup_tags;
232 int modlength;
233
234 /* Lowest usable kernel memory */
235 memlo = 0xff000000;
236
237 /* Disable interrupts and let FPU work */
238 wrmsr((rdmsr() & ~(MSR_CE | MSR_EE | MSR_ME)) | MSR_FP);
239
240 /* Enable FPU */
241 wrspr(CCR0, rdspr(CCR0) & ~0x00100000);
242 wrspr(CCR1, rdspr(CCR1) | (0x80000000 >> 24));
243
244 /* First message after FPU is enabled, otherwise illegal instruction */
245 D(bug("[KRN] Sam440 Kernel built on %s\n", __DATE__));
246
247 wrspr(SPRG0, 0);
248 wrspr(SPRG1, 0);
249 wrspr(SPRG2, 0);
250 wrspr(SPRG3, 0);
251 wrspr(SPRG4, 0); /* Clear KernelBase */
252 wrspr(SPRG5, 0); /* Clear SysBase */
253
254 D(bug("[KRN] Kernel resource pre-exec init\n"));
255 D(bug("[KRN] MSR=%08x CRR0=%08x CRR1=%08x\n", rdmsr(), rdspr(CCR0), rdspr(CCR1)));
256 D(bug("[KRN] USB config %08x\n", rddcr(SDR0_USB0)));
257
258 D(bug("[KRN] msg @ %p\n", msg));
259 D(bug("[KRN] Copying msg data\n"));
260 while(msg->ti_Tag != TAG_DONE)
261 {
262 *tmp = *msg;
263
264 if (tmp->ti_Tag == KRN_CmdLine)
265 {
266 strcpy(CmdLine, (char*) msg->ti_Data);
267 tmp->ti_Data = (STACKIPTR) CmdLine;
268 D(bug("[KRN] CmdLine: %s\n", tmp->ti_Data));
269 }
270 else if (tmp->ti_Tag == KRN_BootLoader)
271 {
272 tmp->ti_Data = (STACKIPTR) memlo;
273 strcpy((char*)tmp->ti_Data, (const char*) msg->ti_Data);
274 memlo += (strlen((char *)memlo) + 4) & ~3;
275 D(bug("[KRN] BootLoader: %s\n", tmp->ti_Data));
276 }
277 else if (tmp->ti_Tag == KRN_DebugInfo)
278 {
279 int i;
280 struct MinList *mlist = (struct MinList *)tmp->ti_Data;
281 module_t *mod;
282
283 D(bug("[KRN] DebugInfo at %08x\n", mlist));
284
285 modlist = (struct MinList *)memlo;
286 memlo += sizeof(*modlist);
287 NEWLIST(modlist);
288
289 mod = (module_t *)memlo;
290
291 ListLength(mlist, modlength);
292 memlo = (uintptr_t)&mod[modlength];
293
294 D(bug("[KRN] Bootstrap loaded debug info for %d modules\n", modlength));
295 /* Copy the module entries */
296 for (i=0; i < modlength; i++)
297 {
298 module_t *m = (module_t *)REMHEAD(mlist);
299 symbol_t *sym;
300 ULONG str_l = ~0, str_h = 0;
301
302 D(bug("[KRN] Module %s\n", m->m_name));
303
304 /* Discover size of the string table */
305 ForeachNode(&m->m_symbols, sym) {
306 ULONG end = (ULONG)sym->s_name + strlen(sym->s_name) + 1 + 1;
307 if ((ULONG)sym->s_name < str_l)
308 str_l = (ULONG)sym->s_name;
309 if (end > str_h)
310 str_h = end;
311 }
312
313 if (str_l > str_h)
314 str_h = str_l = 0;
315
316 mod[i].m_lowest = m->m_lowest;
317 mod[i].m_highest = m->m_highest;
318 mod[i].m_str = (char *)memlo;
319 memcpy(mod[i].m_str, (char *)str_l, str_h - str_l);
320 memlo += ((str_h - str_l) + 3) & ~3;
321 mod[i].m_name = (char *)memlo;
322 memlo += (strlen(m->m_name) + 4) & ~3;
323 strcpy(mod[i].m_name, m->m_name);
324
325 NEWLIST(&mod[i].m_symbols);
326
327 ForeachNode(&m->m_symbols, sym)
328 {
329 symbol_t *newsym = (symbol_t *)memlo;
330 memlo += sizeof(symbol_t);
331
332 newsym->s_name = (IPTR)sym->s_name - str_l + mod[i].m_str;
333 newsym->s_lowest = sym->s_lowest;
334 newsym->s_highest = sym->s_highest;
335
336 ADDTAIL(&mod[i].m_symbols, newsym);
337 }
338
339 ADDTAIL(modlist, &mod[i]);
340 }
341
342 D(bug("[KRN] Debug info uses %d KB of memory\n", ((intptr_t)memlo - (intptr_t)modlist) >> 10));
343 D(bug("[KRN] Debug info relocated from %p to %p\n", tmp->ti_Data, modlist));
344
345 /* Ugh. Parthenope doesn't use the ELF_ModuleInfo format.
346 * Prevent debug.library from becoming confused.
347 */
348 tmp->ti_Data = 0;
349 }
350
351 ++tmp;
352 ++msg;
353 }
354
355 memlo = (memlo + 4095) & ~4095;
356
357 BootMsg = tmp_struct.bootup_tags;
358 D(bug("[KRN] BootMsg @ %p\n", BootMsg));
359
360 /* Do a slightly more sophisticated MMU map */
361 mmu_init(BootMsg);
362 intr_init();
363
364 /* Initialize exec.library */
365 exec_main(BootMsg, NULL);
366
367 bug("[KRN] Uhm? Nothing to do?\n[KRN] STOPPED\n");
368
369 /*
370 * Do never ever try to return. This code would attempt to go back to the physical address
371 * of asm trampoline, not the virtual one!
372 */
373 for (;;);
374 }
375
376 void SetupClocking440(struct PlatformData *pd)
377 {
378 /* PLL divisors */
379 wrdcr(CPR0_CFGADDR, CPR0_PLLD0);
380 uint32_t reg = rddcr(CPR0_CFGDATA);
381
382 uint32_t fbdv = (reg >> 24) & 0x1f;
383 if (fbdv == 0)
384 fbdv = 32;
385 uint32_t fwdva = (reg >> 16) & 0x1f;
386 if (fwdva == 0)
387 fwdva = 16;
388 uint32_t fwdvb = (reg >> 8) & 7;
389 if (fwdvb == 0)
390 fwdvb = 8;
391 uint32_t lfbdv = reg & 0x3f;
392 if (lfbdv == 0)
393 lfbdv = 64;
394
395 /* OPB clock divisor */
396 wrdcr(CPR0_CFGADDR, CPR0_OPBD0);
397 reg = rddcr(CPR0_CFGDATA);
398 uint32_t opbdv0 = (reg >> 24) & 3;
399 if (opbdv0 == 0)
400 opbdv0 = 4;
401
402 /* Peripheral clock divisor */
403 wrdcr(CPR0_CFGADDR, CPR0_PERD0);
404 reg = rddcr(CPR0_CFGDATA);
405 uint32_t perdv0 = (reg >> 24) & 7;
406 if (perdv0 == 0)
407 perdv0 = 8;
408
409 /* PCI clock divisor */
410 wrdcr(CPR0_CFGADDR, CPR0_SPCID);
411 reg = rddcr(CPR0_CFGDATA);
412 uint32_t spcid0 = (reg >> 24) & 3;
413 if (spcid0 == 0)
414 spcid0 = 4;
415
416 /* Primary B divisor */
417 wrdcr(CPR0_CFGADDR, CPR0_PRIMBD0);
418 reg = rddcr(CPR0_CFGDATA);
419 uint32_t prbdv0 = (reg >> 24) & 7;
420 if (prbdv0 == 0)
421 prbdv0 = 8;
422
423 /* All divisors there. Read PLL control register and calculate the m value (see 44ep.book) */
424 wrdcr(CPR0_CFGADDR, CPR0_PLLC0);
425 reg = rddcr(CPR0_CFGDATA);
426 uint32_t m;
427 switch ((reg >> 24) & 3) /* Feedback selector */
428 {
429 case 0:/* PLL output (A or B) */
430 if ((reg & 0x20000000)) /* PLLOUTB */
431 m = lfbdv * fbdv * fwdvb;
432 else
433 m = lfbdv * fbdv * fwdva;
434 break;
435 case 1: /* CPU */
436 m = fbdv * fwdva;
437 default:
438 m = perdv0 * opbdv0 * fwdvb;
439 }
440
441 uint32_t vco = (m * 66666666) + m/2;
442 pd->pd_CPUFreq = vco / fwdva;
443 pd->pd_PLBFreq = vco / fwdvb / perdv0;
444 pd->pd_OPBFreq = pd->pd_PLBFreq / opbdv0;
445 pd->pd_EPBFreq = pd->pd_PLBFreq / perdv0;
446 pd->pd_PCIFreq = pd->pd_PLBFreq / spcid0;
447
448 /*
449 * Slow down the decrement interrupt a bit. Rough guess is that UBoot has left us with
450 * 1kHz DEC counter. Enable decrementer timer and automatic reload of decrementer value.
451 */
452 wrspr(DECAR, pd->pd_OPBFreq / 50);
453 wrspr(TCR, rdspr(TCR) | TCR_DIE | TCR_ARE);
454 }
455
456
457 const uint8_t fbdv_map[256] = {
458 1, 123, 117, 251, 245, 69, 111, 125,
459 119, 95, 105, 197, 239, 163, 63, 253,
460 247, 187, 57, 223, 233, 207, 157, 71,
461 113, 15, 89, 37, 191, 19, 99, 127,
462 121, 109, 93, 61, 185, 155, 13, 97,
463 107, 11, 9, 81, 31, 49, 83, 199,
464 241, 33, 181, 143, 217, 173, 51, 165,
465 65, 85, 151, 147, 227, 41, 201, 255,
466 249, 243, 195, 237, 221, 231, 35, 189,
467 59, 183, 79, 29, 141, 215, 145, 225,
468 235, 219, 27, 139, 137, 135, 175, 209,
469 159, 53, 45, 177, 211, 23, 167, 73,
470 115, 67, 103, 161, 55, 205, 87, 17,
471 91, 153, 7, 47, 179, 171, 149, 39,
472 193, 229, 77, 213, 25, 133, 43, 21,
473 101, 203, 5, 169, 75, 131, 3, 129,
474 1, 250, 244, 124, 118, 196, 238, 252,
475 246, 222, 232, 70, 112, 36, 190, 126,
476 120, 60, 184, 96, 106, 80, 30, 198,
477 240, 142, 216, 164, 64, 146, 226, 254,
478 248, 236, 220, 188, 58, 28, 140, 224,
479 234, 138, 136, 208, 158, 176, 210, 72,
480 114, 160, 54, 16, 90, 46, 178, 38,
481 192, 212, 24, 20, 100, 168, 74, 128,
482 122, 116, 68, 110, 94, 104, 162, 62,
483 186, 56, 206, 156, 14, 88, 18, 98,
484 108, 92, 154, 12, 10, 8, 48, 82,
485 32, 180, 172, 50, 84, 150, 40, 200,
486 242, 194, 230, 34, 182, 78, 214, 144,
487 218, 26, 134, 174, 52, 44, 22, 166,
488 66, 102, 204, 86, 152, 6, 170, 148,
489 228, 76, 132, 42, 202, 4, 130, 2,
490 };
491
492 static const uint8_t fwdv_map[16] = {
493 1, 2, 14, 9, 4, 11, 16, 13,
494 12, 5, 6, 15, 10, 7, 8, 3,
495 };
496
497 void SetupClocking460(struct PlatformData *pd)
498 {
499 uint32_t reg;
500
501 /* PLL divisors */
502 wrdcr(CPR0_CFGADDR, CPR0_PLLD);
503 reg = rddcr(CPR0_CFGDATA);
504
505 uint32_t fbdv = fbdv_map[(reg >> 24) & 0xff];
506 uint32_t fwdva = fwdv_map[((reg >> 16) & 0xf)];
507 uint32_t fwdvb = fwdv_map[(reg >> 8) & 0xf];
508 (void)fwdvb; // Unused
509
510 /* Early PLL divisor */
511 wrdcr(CPR0_CFGADDR, CPR0_PLBED);
512 reg = rddcr(CPR0_CFGDATA);
513 uint32_t plbed = (reg >> 24) & 0x7;
514 if (plbed == 0)
515 plbed = 8;
516
517 /* OPB clock divisor */
518 wrdcr(CPR0_CFGADDR, CPR0_OPBD);
519 reg = rddcr(CPR0_CFGDATA);
520 uint32_t opbd = (reg >> 24) & 3;
521 if (opbd == 0)
522 opbd = 4;
523
524 /* Peripheral clock divisor */
525 wrdcr(CPR0_CFGADDR, CPR0_PERD);
526 reg = rddcr(CPR0_CFGDATA);
527 uint32_t perd = (reg >> 24) & 3;
528 if (perd == 0)
529 perd = 4;
530
531 /* AHB clock divisor */
532 wrdcr(CPR0_CFGADDR, CPR0_AHBD);
533 reg = rddcr(CPR0_CFGDATA);
534 uint32_t ahbd = (reg >> 24) & 1;
535 if (ahbd == 0)
536 ahbd = 2;
537
538 /* All divisors there.
539 * Read PLL control register and calculate the m value
540 */
541 wrdcr(CPR0_CFGADDR, CPR0_PLLC);
542 reg = rddcr(CPR0_CFGDATA);
543
544 uint32_t m;
545 if (((reg >> 24) & 3) == 0) {
546 /* PLL internal feedback */
547 m = fbdv;
548 } else {
549 /* PLL Per-Clock feedback */
550 m = fwdva * plbed * opbd * ahbd;
551 }
552
553 D(bug("fbdv %d, fwdva = %d, fwdvb = %d\n", fbdv, fwdva, fwdvb));
554 D(bug("plbed %d, opbd = %d, perd = %d, ahbd = %d\n",
555 plbed, opbd, perd, ahbd));
556
557 uint64_t vco = m * 55000000;
558 pd->pd_CPUFreq = vco / fwdva;
559 pd->pd_PLBFreq = vco / fwdva / plbed;
560 pd->pd_OPBFreq = pd->pd_PLBFreq / opbd;
561 pd->pd_EPBFreq = pd->pd_OPBFreq / perd;
562 pd->pd_PCIFreq = pd->pd_PLBFreq / ahbd;
563
564 /*
565 * Slow down the decrement interrupt a bit. Rough guess is that UBoot has left us with
566 * 1kHz DEC counter. Enable decrementer timer and automatic reload of decrementer value.
567 */
568 wrspr(DECAR, pd->pd_OPBFreq / 5);
569 wrspr(TCR, rdspr(TCR) | TCR_DIE | TCR_ARE);
570 wrspr(CCR1, rdspr(CCR1) & ~(0x80000000 >> 24));
571 }
572
573 static int Kernel_Init(LIBBASETYPEPTR LIBBASE)
574 {
575 int i;
576 struct PlatformData *pd;
577
578 uintptr_t krn_lowest = krnGetTagData(KRN_KernelLowest, 0, BootMsg);
579 uintptr_t krn_highest = krnGetTagData(KRN_KernelHighest, 0, BootMsg);
580
581 D(bug("[KRN] Entered Kernel_Init()\n"));
582 /* Get the PLB and CPU speed */
583
584 pd = AllocMem(sizeof(struct PlatformData), MEMF_PUBLIC|MEMF_CLEAR);
585 if (!pd)
586 return FALSE;
587
588 LIBBASE->kb_PlatformData = pd;
589
590 /* Stash the PVR value */
591 pd->pd_PVR = rdspr(PVR);
592 D(bug("[KRN] PVR: 0x%08x\n", pd->pd_PVR));
593
594 if (krnIsPPC440(pd->pd_PVR)) {
595 SetupClocking440(pd);
596 } else if (krnIsPPC460(pd->pd_PVR)) {
597 SetupClocking460(pd);
598 } else {
599 bug("kernel.resource: Unknown PVR model 0x%08x\n", pd->pd_PVR);
600 for (;;);
601 }
602
603 D(bug("[KRN] CPU Speed: %dMz\n", LIBBASE->kb_PlatformData->pd_CPUFreq / 1000000));
604 D(bug("[KRN] PLB Speed: %dMz\n", LIBBASE->kb_PlatformData->pd_PLBFreq / 1000000));
605 D(bug("[KRN] OPB Speed: %dMz\n", LIBBASE->kb_PlatformData->pd_OPBFreq / 1000000));
606 D(bug("[KRN] EPB Speed: %dMz\n", LIBBASE->kb_PlatformData->pd_EPBFreq / 1000000));
607 D(bug("[KRN] PCI Speed: %dMz\n", LIBBASE->kb_PlatformData->pd_PCIFreq / 1000000));
608
609 /* 4K granularity for data sections */
610 krn_lowest &= 0xfffff000;
611 /* 64K granularity for code sections */
612 krn_highest = (krn_highest + 0xffff) & 0xffff0000;
613
614 D(bug("[KRN] Allowing userspace to flush caches\n"));
615 wrspr(MMUCR, rdspr(MMUCR) & ~0x000c0000);
616
617 for (i=0; i < 16; i++)
618 NEWLIST(&LIBBASE->kb_Exceptions[i]);
619
620 for (i=0; i < 64; i++)
621 NEWLIST(&LIBBASE->kb_Interrupts[i]);
622
623 LIBBASE->kb_ContextSize = sizeof(context_t);
624
625 D(bug("[KRN] Setting DebugInfo to %p\n", modlist));
626 LIBBASE->kb_PlatformData->pd_DebugInfo = (APTR)modlist;
627
628 D(bug("[KRN] Preparing kernel private memory\n"));
629
630 /*
631 * Add MemHeader about kernel memory to public MemList to avoid invalid
632 * pointer debug messages for pointer that reference correctly into these
633 * mem regions.
634 */
635 krnCreateMemHeader("Kernel Memory", -10, (APTR)memlo, krn_lowest - ((uintptr_t)memlo & 0x00ffffff), MEMF_FAST | MEMF_KICK | MEMF_LOCAL | MEMF_24BITDMA);
636 krnCreateROMHeader("Kernel Reserved",
637 (APTR)0xff000000, (APTR)(memlo - 1));
638 krnCreateROMHeader("Kernel Code + Data Sections",
639 (APTR) ((uintptr_t) 0xff000000 + krn_lowest - 1),
640 (APTR) ((uintptr_t) 0xff000000 + krn_highest - 1));
641
642 /*
643 * kernel.resource is ready to run, leave supervisor mode. External interrupts
644 * will be enabled during late exec init.
645 */
646
647 wrmsr(rdmsr() | MSR_PR);
648 D(bug("[KRN] Entered user mode \n"));
649
650 return TRUE;
651 }
652
653 ADD2INITLIB(Kernel_Init, 0)
Mirror of AROS' svn.