1 /* $NetBSD: machdep.c,v 1.13 2006/09/18 22:05:47 gdamore Exp $ */ 2 3 /*- 4 * Copyright (c) 2003 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Juergen Hannken-Illjes. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 #include <sys/cdefs.h> 40 __KERNEL_RCSID(0, "$NetBSD: machdep.c,v 1.13 2006/09/18 22:05:47 gdamore Exp $"); 41 42 #include "opt_explora.h" 43 #include "ksyms.h" 44 45 #include <sys/param.h> 46 #include <sys/buf.h> 47 #include <sys/msgbuf.h> 48 #include <sys/kernel.h> 49 #include <sys/mount.h> 50 #include <sys/proc.h> 51 #include <sys/user.h> 52 #include <sys/reboot.h> 53 #include <sys/ksyms.h> 54 55 #include <uvm/uvm_extern.h> 56 57 #include <prop/proplib.h> 58 59 #include <net/netisr.h> 60 61 #include <machine/explora.h> 62 #include <machine/bus.h> 63 #include <machine/powerpc.h> 64 #include <machine/tlb.h> 65 #include <machine/trap.h> 66 67 #include <powerpc/spr.h> 68 #include <powerpc/ibm4xx/dcr403cgx.h> 69 70 #if NKSYMS || defined(DDB) || defined(LKM) 71 #include <machine/db_machdep.h> 72 #include <ddb/db_extern.h> 73 #endif 74 75 #define MEMREGIONS 2 76 #define TLB_PG_SIZE (16*1024*1024) 77 78 char cpu_model[80]; 79 char machine[] = MACHINE; /* from <machine/param.h> */ 80 char machine_arch[] = MACHINE_ARCH; /* from <machine/param.h> */ 81 82 static const unsigned int cpuspeed = 66000000; 83 84 extern struct user *proc0paddr; 85 86 prop_dictionary_t board_properties; 87 struct vm_map *phys_map = NULL; 88 struct vm_map *mb_map = NULL; 89 struct vm_map *exec_map = NULL; 90 char msgbuf[MSGBUFSIZE]; 91 paddr_t msgbuf_paddr; 92 93 static struct mem_region phys_mem[MEMREGIONS]; 94 static struct mem_region avail_mem[MEMREGIONS]; 95 96 void bootstrap(u_int, u_int); 97 static void install_extint(void (*)(void)); 98 int lcsplx(int); 99 100 /* 101 * Trap vectors 102 */ 103 extern int defaulttrap, defaultsize; 104 extern int sctrap, scsize; 105 extern int alitrap, alisize; 106 extern int dsitrap, dsisize; 107 extern int isitrap, isisize; 108 extern int mchktrap, mchksize; 109 extern int tlbimiss4xx, tlbim4size; 110 extern int tlbdmiss4xx, tlbdm4size; 111 extern int pitfitwdog, pitfitwdogsize; 112 extern int debugtrap, debugsize; 113 extern int errata51handler, errata51size; 114 #ifdef DDB 115 extern int ddblow, ddbsize; 116 #endif 117 static struct { 118 int vector; 119 void *addr; 120 void *size; 121 } trap_table[] = { 122 { EXC_SC, &sctrap, &scsize }, 123 { EXC_ALI, &alitrap, &alisize }, 124 { EXC_DSI, &dsitrap, &dsisize }, 125 { EXC_ISI, &isitrap, &isisize }, 126 { EXC_MCHK, &mchktrap, &mchksize }, 127 { EXC_ITMISS, &tlbimiss4xx, &tlbim4size }, 128 { EXC_DTMISS, &tlbdmiss4xx, &tlbdm4size }, 129 { EXC_PIT, &pitfitwdog, &pitfitwdogsize }, 130 { EXC_DEBUG, &debugtrap, &debugsize }, 131 { (EXC_DTMISS|EXC_ALI), &errata51handler, &errata51size }, 132 #if defined(DDB) 133 { EXC_PGM, &ddblow, &ddbsize }, 134 #endif /* DDB */ 135 }; 136 137 static void 138 set_tlb(int idx, u_int addr, u_int flags) 139 { 140 u_int lo, hi; 141 142 addr &= ~(TLB_PG_SIZE-1); 143 144 lo = addr | TLB_EX | TLB_WR | flags; 145 #ifdef PPC_4XX_NOCACHE 146 lo |= TLB_I; 147 #endif 148 hi = addr | TLB_VALID | TLB_PG_16M; 149 150 __asm volatile( 151 " tlbwe %1,%0,1 \n" 152 " tlbwe %2,%0,0 \n" 153 " sync \n" 154 : : "r" (idx), "r" (lo), "r" (hi) ); 155 } 156 157 /* 158 * Install a trap vector. We cannot use memcpy because the 159 * destination may be zero. 160 */ 161 static void 162 trap_copy(void *src, int dest, size_t len) 163 { 164 uint32_t *src_p = src; 165 uint32_t *dest_p = (void *)dest; 166 167 while (len > 0) { 168 *dest_p++ = *src_p++; 169 len -= sizeof(uint32_t); 170 } 171 } 172 173 void 174 bootstrap(u_int startkernel, u_int endkernel) 175 { 176 u_int i, j, t, br[4]; 177 u_int ntlb, maddr, msize, size; 178 struct cpu_info * const ci = &cpu_info[0]; 179 180 consinit(); 181 182 br[0] = mfdcr(DCR_BR4); 183 br[1] = mfdcr(DCR_BR5); 184 br[2] = mfdcr(DCR_BR6); 185 br[3] = mfdcr(DCR_BR7); 186 187 for (i = 0; i < 4; i++) 188 for (j = i+1; j < 4; j++) 189 if (br[j] < br[i]) 190 t = br[j], br[j] = br[i], br[i] = t; 191 192 for (i = 0, size = 0; i < 4; i++) { 193 if (((br[i] >> 19) & 3) != 3) 194 continue; 195 maddr = ((br[i] >> 24) & 0xff) << 20; 196 msize = 1 << (20 + ((br[i] >> 21) & 7)); 197 if (maddr+msize > size) 198 size = maddr+msize; 199 } 200 201 #ifdef COM_IS_CONSOLE 202 ntlb = TLB_NRESERVED-1; 203 #else 204 ntlb = TLB_NRESERVED-2; 205 #endif 206 if (size > ntlb*TLB_PG_SIZE) 207 size = ntlb*TLB_PG_SIZE; 208 209 phys_mem[0].start = 0; 210 phys_mem[0].size = size & ~PGOFSET; 211 avail_mem[0].start = startkernel; 212 avail_mem[0].size = size-startkernel; 213 214 __asm volatile( 215 " mtpid %0 \n" 216 " sync \n" 217 : : "r" (1) ); 218 219 /* 220 * Setup initial tlbs. 221 * Physical memory and console device are 222 * mapped into the first (reserved) tlbs. 223 */ 224 225 t = 0; 226 for (maddr = 0; maddr < phys_mem[0].size; maddr += TLB_PG_SIZE) 227 set_tlb(t++, maddr, 0); 228 229 #ifdef COM_IS_CONSOLE 230 set_tlb(t++, BASE_COM, TLB_I | TLB_G); 231 #else 232 set_tlb(t++, BASE_FB, TLB_I | TLB_G); 233 set_tlb(t++, BASE_FB2, TLB_I | TLB_G); 234 #endif 235 236 /* Disable all external interrupts */ 237 mtdcr(DCR_EXIER, 0); 238 239 /* Disable all timer interrupts */ 240 mtspr(SPR_TCR, 0); 241 242 /* Initialize cache info for memcpy, etc. */ 243 cpu_probe_cache(); 244 245 /* 246 * Initialize lwp0 and current pcb and pmap pointers. 247 */ 248 lwp0.l_cpu = ci; 249 lwp0.l_addr = proc0paddr; 250 memset(lwp0.l_addr, 0, sizeof *lwp0.l_addr); 251 252 curpcb = &proc0paddr->u_pcb; 253 curpcb->pcb_pm = pmap_kernel(); 254 255 /* 256 * Install trap vectors. 257 */ 258 259 for (i = EXC_RSVD; i <= EXC_LAST; i += 0x100) 260 trap_copy(&defaulttrap, i, (size_t)&defaultsize); 261 262 for (i = 0; i < sizeof(trap_table)/sizeof(trap_table[0]); i++) { 263 trap_copy(trap_table[i].addr, trap_table[i].vector, 264 (size_t)trap_table[i].size); 265 } 266 267 __syncicache((void *)EXC_RST, EXC_LAST - EXC_RST + 0x100); 268 269 /* 270 * Set Exception vector base. 271 * Handle trap instruction as PGM exception. 272 */ 273 274 mtspr(SPR_EVPR, 0); 275 276 t = mfspr(SPR_DBCR0); 277 t &= ~DBCR0_TDE; 278 mtspr(SPR_DBCR0, t); 279 280 /* 281 * External interrupt handler install. 282 */ 283 284 install_extint(ext_intr); 285 286 /* 287 * Now enable translation (and machine checks/recoverable interrupts). 288 */ 289 __asm volatile ( 290 " mfmsr %0 \n" 291 " ori %0,%0,%1 \n" 292 " mtmsr %0 \n" 293 " sync \n" 294 : : "r" (0), "K" (PSL_IR|PSL_DR|PSL_ME) ); 295 296 uvm_setpagesize(); 297 298 /* 299 * Initialize pmap module. 300 */ 301 pmap_bootstrap(startkernel, endkernel); 302 303 #if NKSYMS || defined(DDB) || defined(LKM) 304 ksyms_init(0, NULL, NULL); 305 #endif 306 307 fake_mapiodev = 0; 308 } 309 310 static void 311 install_extint(void (*handler)(void)) 312 { 313 extern int extint, extsize; 314 extern u_long extint_call; 315 u_long offset = (u_long)handler - (u_long)&extint_call; 316 int omsr, msr; 317 318 #ifdef DIAGNOSTIC 319 if (offset > 0x1ffffff) 320 panic("install_extint: too far away"); 321 #endif 322 __asm volatile ( 323 " mfmsr %0 \n" 324 " andi. %1,%0,%2 \n" 325 " mtmsr %1 \n" 326 : "=r" (omsr), "=r" (msr) : "K" ((u_short)~PSL_EE) ); 327 extint_call = (extint_call & 0xfc000003) | offset; 328 memcpy((void *)EXC_EXI, &extint, (size_t)&extsize); 329 __syncicache((void *)&extint_call, sizeof extint_call); 330 __syncicache((void *)EXC_EXI, (int)&extsize); 331 __asm volatile ( 332 " mtmsr %0 \n" 333 : : "r" (omsr) ); 334 } 335 336 void 337 cpu_startup(void) 338 { 339 vaddr_t minaddr, maxaddr; 340 prop_number_t pn; 341 char pbuf[9]; 342 343 /* 344 * Initialize error message buffer (before start of kernel) 345 */ 346 initmsgbuf((caddr_t)msgbuf, round_page(MSGBUFSIZE)); 347 348 printf("%s%s", copyright, version); 349 printf("NCD Explora451\n"); 350 351 format_bytes(pbuf, sizeof(pbuf), ctob(physmem)); 352 printf("total memory = %s\n", pbuf); 353 354 minaddr = 0; 355 /* 356 * Allocate a submap for exec arguments. This map effectively 357 * limits the number of processes exec'ing at any time. 358 */ 359 exec_map = uvm_km_suballoc(kernel_map, &minaddr, &maxaddr, 360 16*NCARGS, VM_MAP_PAGEABLE, FALSE, NULL); 361 362 /* 363 * Allocate a submap for physio 364 */ 365 phys_map = uvm_km_suballoc(kernel_map, &minaddr, &maxaddr, 366 VM_PHYS_SIZE, 0, FALSE, NULL); 367 368 /* 369 * No need to allocate an mbuf cluster submap. Mbuf clusters 370 * are allocated via the pool allocator, and we use direct-mapped 371 * pool pages. 372 */ 373 374 format_bytes(pbuf, sizeof(pbuf), ptoa(uvmexp.free)); 375 printf("avail memory = %s\n", pbuf); 376 377 /* 378 * Set up the board properties database. 379 */ 380 board_properties = prop_dictionary_create(); 381 KASSERT(board_properties != NULL); 382 383 pn = prop_number_create_integer(ctob(physmem)); 384 KASSERT(pn != NULL); 385 if (prop_dictionary_set(board_properties, "mem-size", pn) == FALSE) 386 panic("setting mem-size"); 387 prop_object_release(pn); 388 389 pn = prop_number_create_integer(cpuspeed); 390 KASSERT(pn != NULL); 391 if (prop_dictionary_set(board_properties, "processor-frequency", 392 pn) == FALSE) 393 panic("setting processor-frequency"); 394 prop_object_release(pn); 395 } 396 397 int 398 lcsplx(int ipl) 399 { 400 return spllower(ipl); /*XXX*/ 401 } 402 403 void 404 cpu_reboot(int howto, char *what) 405 { 406 static int syncing = 0; 407 408 boothowto = howto; 409 if (!cold && !(howto & RB_NOSYNC) && !syncing) { 410 syncing = 1; 411 vfs_shutdown(); 412 resettodr(); 413 } 414 415 splhigh(); 416 417 if (!cold && (howto & RB_DUMP)) 418 /*XXX dumpsys()*/; 419 420 doshutdownhooks(); 421 422 if (howto & RB_HALT) { 423 printf("halted\n\n"); 424 425 while (1) 426 ; 427 } 428 429 printf("rebooting\n\n"); 430 431 /* flush cache for msgbuf */ 432 __syncicache((void *)msgbuf_paddr, round_page(MSGBUFSIZE)); 433 434 ppc4xx_reset(); 435 436 #ifdef DDB 437 while (1) 438 Debugger(); 439 #else 440 while (1) 441 ; 442 #endif 443 } 444 445 void 446 mem_regions(struct mem_region **mem, struct mem_region **avail) 447 { 448 *mem = phys_mem; 449 *avail = avail_mem; 450 } 451