mv_machdep.c revision 184729
1/*- 2 * Copyright (c) 1994-1998 Mark Brinicombe. 3 * Copyright (c) 1994 Brini. 4 * All rights reserved. 5 * 6 * This code is derived from software written for Brini by Mark Brinicombe 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by Brini. 19 * 4. The name of the company nor the name of the author may be used to 20 * endorse or promote products derived from this software without specific 21 * prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY BRINI ``AS IS'' AND ANY EXPRESS OR IMPLIED 24 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 25 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 26 * IN NO EVENT SHALL BRINI OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 27 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 28 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 29 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * from: FreeBSD: //depot/projects/arm/src/sys/arm/at91/kb920x_machdep.c, rev 45 36 */ 37 38#include "opt_msgbuf.h" 39#include "opt_ddb.h" 40 41#include <sys/cdefs.h> 42__FBSDID("$FreeBSD: head/sys/arm/mv/mv_machdep.c 184729 2008-11-06 16:25:12Z raj $"); 43 44#define _ARM32_BUS_DMA_PRIVATE 45#include <sys/param.h> 46#include <sys/systm.h> 47#include <sys/sysproto.h> 48#include <sys/signalvar.h> 49#include <sys/imgact.h> 50#include <sys/kernel.h> 51#include <sys/ktr.h> 52#include <sys/linker.h> 53#include <sys/lock.h> 54#include <sys/malloc.h> 55#include <sys/mutex.h> 56#include <sys/pcpu.h> 57#include <sys/proc.h> 58#include <sys/ptrace.h> 59#include <sys/cons.h> 60#include <sys/bio.h> 61#include <sys/bus.h> 62#include <sys/buf.h> 63#include <sys/exec.h> 64#include <sys/kdb.h> 65#include <sys/msgbuf.h> 66#include <machine/reg.h> 67#include <machine/cpu.h> 68 69#include <vm/vm.h> 70#include <vm/pmap.h> 71#include <vm/vm_object.h> 72#include <vm/vm_page.h> 73#include <vm/vm_pager.h> 74#include <vm/vm_map.h> 75#include <vm/vnode_pager.h> 76#include <machine/pte.h> 77#include <machine/pmap.h> 78#include <machine/vmparam.h> 79#include <machine/pcb.h> 80#include <machine/undefined.h> 81#include <machine/machdep.h> 82#include <machine/metadata.h> 83#include <machine/armreg.h> 84#include <machine/bus.h> 85#include <sys/reboot.h> 86#include <machine/bootinfo.h> 87 88#include <arm/mv/mvvar.h> /* XXX eventually this should be eliminated */ 89 90#ifdef DEBUG 91#define debugf(fmt, args...) printf(fmt, ##args) 92#else 93#define debugf(fmt, args...) 94#endif 95 96/* 97 * This is the number of L2 page tables required for covering max 98 * (hypothetical) memsize of 4GB and all kernel mappings (vectors, msgbuf, 99 * stacks etc.), uprounded to be divisible by 4. 100 */ 101#define KERNEL_PT_MAX 78 102 103/* Define various stack sizes in pages */ 104#define IRQ_STACK_SIZE 1 105#define ABT_STACK_SIZE 1 106#define UND_STACK_SIZE 1 107 108/* Maximum number of memory regions */ 109#define MEM_REGIONS 8 110 111extern unsigned char kernbase[]; 112extern unsigned char _etext[]; 113extern unsigned char _edata[]; 114extern unsigned char __bss_start[]; 115extern unsigned char _end[]; 116 117extern u_int data_abort_handler_address; 118extern u_int prefetch_abort_handler_address; 119extern u_int undefined_handler_address; 120 121extern const struct pmap_devmap *pmap_devmap_bootstrap_table; 122extern vm_offset_t pmap_bootstrap_lastaddr; 123 124struct pv_addr kernel_pt_table[KERNEL_PT_MAX]; 125 126extern int *end; 127 128struct pcpu __pcpu; 129struct pcpu *pcpup = &__pcpu; 130 131/* Physical and virtual addresses for some global pages */ 132 133vm_paddr_t phys_avail[10]; 134vm_paddr_t dump_avail[4]; 135vm_offset_t physical_pages; 136 137struct pv_addr systempage; 138struct pv_addr msgbufpv; 139struct pv_addr irqstack; 140struct pv_addr undstack; 141struct pv_addr abtstack; 142struct pv_addr kernelstack; 143 144static struct trapframe proc0_tf; 145 146struct mem_region { 147 vm_offset_t mr_start; 148 vm_size_t mr_size; 149}; 150 151static struct mem_region availmem_regions[MEM_REGIONS]; 152static int availmem_regions_sz; 153 154struct bootinfo *bootinfo; 155 156static void print_kenv(void); 157static void print_kernel_section_addr(void); 158static void print_bootinfo(void); 159 160static void physmap_init(int); 161 162static char * 163kenv_next(char *cp) 164{ 165 166 if (cp != NULL) { 167 while (*cp != 0) 168 cp++; 169 cp++; 170 if (*cp == 0) 171 cp = NULL; 172 } 173 return (cp); 174} 175 176static void 177print_kenv(void) 178{ 179 int len; 180 char *cp; 181 182 debugf("loader passed (static) kenv:\n"); 183 if (kern_envp == NULL) { 184 debugf(" no env, null ptr\n"); 185 return; 186 } 187 debugf(" kern_envp = 0x%08x\n", (uint32_t)kern_envp); 188 189 len = 0; 190 for (cp = kern_envp; cp != NULL; cp = kenv_next(cp)) 191 debugf(" %x %s\n", (uint32_t)cp, cp); 192} 193 194static void 195print_bootinfo(void) 196{ 197 struct bi_mem_region *mr; 198 struct bi_eth_addr *eth; 199 int i, j; 200 201 debugf("bootinfo:\n"); 202 if (bootinfo == NULL) { 203 debugf(" no bootinfo, null ptr\n"); 204 return; 205 } 206 207 debugf(" version = 0x%08x\n", bootinfo->bi_version); 208 debugf(" ccsrbar = 0x%08x\n", bootinfo->bi_bar_base); 209 debugf(" cpu_clk = 0x%08x\n", bootinfo->bi_cpu_clk); 210 debugf(" bus_clk = 0x%08x\n", bootinfo->bi_bus_clk); 211 212 debugf(" mem regions:\n"); 213 mr = (struct bi_mem_region *)bootinfo->bi_data; 214 for (i = 0; i < bootinfo->bi_mem_reg_no; i++, mr++) 215 debugf(" #%d, base = 0x%08x, size = 0x%08x\n", i, 216 mr->mem_base, mr->mem_size); 217 218 debugf(" eth addresses:\n"); 219 eth = (struct bi_eth_addr *)mr; 220 for (i = 0; i < bootinfo->bi_eth_addr_no; i++, eth++) { 221 debugf(" #%d, addr = ", i); 222 for (j = 0; j < 6; j++) 223 debugf("%02x ", eth->mac_addr[j]); 224 debugf("\n"); 225 } 226} 227 228static void 229print_kernel_section_addr(void) 230{ 231 232 debugf("kernel image addresses:\n"); 233 debugf(" kernbase = 0x%08x\n", (uint32_t)kernbase); 234 debugf(" _etext (sdata) = 0x%08x\n", (uint32_t)_etext); 235 debugf(" _edata = 0x%08x\n", (uint32_t)_edata); 236 debugf(" __bss_start = 0x%08x\n", (uint32_t)__bss_start); 237 debugf(" _end = 0x%08x\n", (uint32_t)_end); 238} 239 240struct bi_mem_region * 241bootinfo_mr(void) 242{ 243 244 return ((struct bi_mem_region *)bootinfo->bi_data); 245} 246 247static void 248physmap_init(int hardcoded) 249{ 250 int i, j, cnt; 251 vm_offset_t phys_kernelend, kernload; 252 uint32_t s, e, sz; 253 struct mem_region *mp, *mp1; 254 255 phys_kernelend = KERNPHYSADDR + (virtual_avail - KERNVIRTADDR); 256 kernload = KERNPHYSADDR; 257 258 /* 259 * Use hardcoded physical addresses if we don't use memory regions 260 * from metadata. 261 */ 262 if (hardcoded) { 263 phys_avail[0] = 0; 264 phys_avail[1] = kernload; 265 266 phys_avail[2] = phys_kernelend; 267 phys_avail[3] = PHYSMEM_SIZE; 268 269 phys_avail[4] = 0; 270 phys_avail[5] = 0; 271 return; 272 } 273 274 /* 275 * Remove kernel physical address range from avail 276 * regions list. Page align all regions. 277 * Non-page aligned memory isn't very interesting to us. 278 * Also, sort the entries for ascending addresses. 279 */ 280 sz = 0; 281 cnt = availmem_regions_sz; 282 debugf("processing avail regions:\n"); 283 for (mp = availmem_regions; mp->mr_size; mp++) { 284 s = mp->mr_start; 285 e = mp->mr_start + mp->mr_size; 286 debugf(" %08x-%08x -> ", s, e); 287 /* Check whether this region holds all of the kernel. */ 288 if (s < kernload && e > phys_kernelend) { 289 availmem_regions[cnt].mr_start = phys_kernelend; 290 availmem_regions[cnt++].mr_size = e - phys_kernelend; 291 e = kernload; 292 } 293 /* Look whether this regions starts within the kernel. */ 294 if (s >= kernload && s < phys_kernelend) { 295 if (e <= phys_kernelend) 296 goto empty; 297 s = phys_kernelend; 298 } 299 /* Now look whether this region ends within the kernel. */ 300 if (e > kernload && e <= phys_kernelend) { 301 if (s >= kernload) { 302 goto empty; 303 } 304 e = kernload; 305 } 306 /* Now page align the start and size of the region. */ 307 s = round_page(s); 308 e = trunc_page(e); 309 if (e < s) 310 e = s; 311 sz = e - s; 312 debugf("%08x-%08x = %x\n", s, e, sz); 313 314 /* Check whether some memory is left here. */ 315 if (sz == 0) { 316 empty: 317 printf("skipping\n"); 318 bcopy(mp + 1, mp, 319 (cnt - (mp - availmem_regions)) * sizeof(*mp)); 320 cnt--; 321 mp--; 322 continue; 323 } 324 325 /* Do an insertion sort. */ 326 for (mp1 = availmem_regions; mp1 < mp; mp1++) 327 if (s < mp1->mr_start) 328 break; 329 if (mp1 < mp) { 330 bcopy(mp1, mp1 + 1, (char *)mp - (char *)mp1); 331 mp1->mr_start = s; 332 mp1->mr_size = sz; 333 } else { 334 mp->mr_start = s; 335 mp->mr_size = sz; 336 } 337 } 338 availmem_regions_sz = cnt; 339 340 /* Fill in phys_avail table, based on availmem_regions */ 341 debugf("fill in phys_avail:\n"); 342 for (i = 0, j = 0; i < availmem_regions_sz; i++, j += 2) { 343 344 debugf(" region: 0x%08x - 0x%08x (0x%08x)\n", 345 availmem_regions[i].mr_start, 346 availmem_regions[i].mr_start + availmem_regions[i].mr_size, 347 availmem_regions[i].mr_size); 348 349 phys_avail[j] = availmem_regions[i].mr_start; 350 phys_avail[j + 1] = availmem_regions[i].mr_start + 351 availmem_regions[i].mr_size; 352 } 353 phys_avail[j] = 0; 354 phys_avail[j + 1] = 0; 355} 356 357void * 358initarm(void *mdp, void *unused __unused) 359{ 360 struct pv_addr kernel_l1pt; 361 vm_offset_t freemempos, l2_start, lastaddr; 362 uint32_t memsize, l2size; 363 struct bi_mem_region *mr; 364 void *kmdp; 365 u_int l1pagetable; 366 int i = 0, j = 0; 367 368 kmdp = NULL; 369 lastaddr = 0; 370 memsize = 0; 371 372 set_cpufuncs(); 373 374 /* 375 * Mask metadata pointer: it is supposed to be on page boundary. If 376 * the first argument (mdp) doesn't point to a valid address the 377 * bootloader must have passed us something else than the metadata 378 * ptr... In this case we want to fall back to some built-in settings. 379 */ 380 mdp = (void *)((uint32_t)mdp & ~PAGE_MASK); 381 382 /* Parse metadata and fetch parameters */ 383 if (mdp != NULL) { 384 preload_metadata = mdp; 385 kmdp = preload_search_by_type("elf kernel"); 386 if (kmdp != NULL) { 387 bootinfo = (struct bootinfo *)preload_search_info(kmdp, 388 MODINFO_METADATA|MODINFOMD_BOOTINFO); 389 390 boothowto = MD_FETCH(kmdp, MODINFOMD_HOWTO, int); 391 kern_envp = MD_FETCH(kmdp, MODINFOMD_ENVP, char *); 392 lastaddr = MD_FETCH(kmdp, MODINFOMD_KERNEND, vm_offset_t); 393 } 394 395 /* Initialize memory regions table */ 396 mr = bootinfo_mr(); 397 for (i = 0; i < bootinfo->bi_mem_reg_no; i++, mr++) { 398 if (i == MEM_REGIONS) 399 break; 400 availmem_regions[i].mr_start = mr->mem_base; 401 availmem_regions[i].mr_size = mr->mem_size; 402 memsize += mr->mem_size; 403 } 404 availmem_regions_sz = i; 405 } else { 406 /* Fall back to hardcoded boothowto flags and metadata. */ 407 boothowto = RB_VERBOSE | RB_SINGLE; 408 lastaddr = fake_preload_metadata(); 409 410 /* 411 * Assume a single memory region of size specified in board 412 * configuration file. 413 */ 414 memsize = PHYSMEM_SIZE; 415 } 416 417 /* 418 * If memsize is invalid, we can neither proceed nor panic (too 419 * early for console output). 420 */ 421 if (memsize == 0) 422 while (1); 423 424 /* Platform-specific initialisation */ 425 if (platform_pmap_init() != 0) 426 return (NULL); 427 428 pcpu_init(pcpup, 0, sizeof(struct pcpu)); 429 PCPU_SET(curthread, &thread0); 430 431 /* Calculate number of L2 tables needed for mapping vm_page_array */ 432 l2size = (memsize / PAGE_SIZE) * sizeof(struct vm_page); 433 l2size = (l2size >> L1_S_SHIFT) + 1; 434 435 /* 436 * Add one table for end of kernel map, one for stacks, msgbuf and 437 * L1 and L2 tables map and one for vectors map. 438 */ 439 l2size += 3; 440 441 /* Make it divisible by 4 */ 442 l2size = (l2size + 3) & ~3; 443 444#define KERNEL_TEXT_BASE (KERNBASE) 445 freemempos = (lastaddr + PAGE_MASK) & ~PAGE_MASK; 446 447 /* Define a macro to simplify memory allocation */ 448#define valloc_pages(var, np) \ 449 alloc_pages((var).pv_va, (np)); \ 450 (var).pv_pa = (var).pv_va + (KERNPHYSADDR - KERNVIRTADDR); 451 452#define alloc_pages(var, np) \ 453 (var) = freemempos; \ 454 freemempos += (np * PAGE_SIZE); \ 455 memset((char *)(var), 0, ((np) * PAGE_SIZE)); 456 457 while (((freemempos - L1_TABLE_SIZE) & (L1_TABLE_SIZE - 1)) != 0) 458 freemempos += PAGE_SIZE; 459 valloc_pages(kernel_l1pt, L1_TABLE_SIZE / PAGE_SIZE); 460 461 for (i = 0; i < l2size; ++i) { 462 if (!(i % (PAGE_SIZE / L2_TABLE_SIZE_REAL))) { 463 valloc_pages(kernel_pt_table[i], 464 L2_TABLE_SIZE / PAGE_SIZE); 465 j = i; 466 } else { 467 kernel_pt_table[i].pv_va = kernel_pt_table[j].pv_va + 468 L2_TABLE_SIZE_REAL * (i - j); 469 kernel_pt_table[i].pv_pa = 470 kernel_pt_table[i].pv_va - KERNVIRTADDR + 471 KERNPHYSADDR; 472 473 } 474 } 475 /* 476 * Allocate a page for the system page mapped to 0x00000000 477 * or 0xffff0000. This page will just contain the system vectors 478 * and can be shared by all processes. 479 */ 480 valloc_pages(systempage, 1); 481 482 /* Allocate stacks for all modes */ 483 valloc_pages(irqstack, IRQ_STACK_SIZE); 484 valloc_pages(abtstack, ABT_STACK_SIZE); 485 valloc_pages(undstack, UND_STACK_SIZE); 486 valloc_pages(kernelstack, KSTACK_PAGES); 487 valloc_pages(msgbufpv, round_page(MSGBUF_SIZE) / PAGE_SIZE); 488 489 /* 490 * Now we start construction of the L1 page table 491 * We start by mapping the L2 page tables into the L1. 492 * This means that we can replace L1 mappings later on if necessary 493 */ 494 l1pagetable = kernel_l1pt.pv_va; 495 496 /* 497 * Try to map as much as possible of kernel text and data using 498 * 1MB section mapping and for the rest of initial kernel address 499 * space use L2 coarse tables. 500 * 501 * Link L2 tables for mapping remainder of kernel (modulo 1MB) 502 * and kernel structures 503 */ 504 l2_start = lastaddr & ~(L1_S_OFFSET); 505 for (i = 0 ; i < l2size - 1; i++) 506 pmap_link_l2pt(l1pagetable, l2_start + i * L1_S_SIZE, 507 &kernel_pt_table[i]); 508 509 pmap_curmaxkvaddr = l2_start + (l2size - 1) * L1_S_SIZE; 510 511 /* Map kernel code and data */ 512 pmap_map_chunk(l1pagetable, KERNVIRTADDR, KERNPHYSADDR, 513 (((uint32_t)(lastaddr) - KERNVIRTADDR) + PAGE_MASK) & ~PAGE_MASK, 514 VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE); 515 516 517 /* Map L1 directory and allocated L2 page tables */ 518 pmap_map_chunk(l1pagetable, kernel_l1pt.pv_va, kernel_l1pt.pv_pa, 519 L1_TABLE_SIZE, VM_PROT_READ|VM_PROT_WRITE, PTE_PAGETABLE); 520 521 pmap_map_chunk(l1pagetable, kernel_pt_table[0].pv_va, 522 kernel_pt_table[0].pv_pa, 523 L2_TABLE_SIZE_REAL * l2size, 524 VM_PROT_READ|VM_PROT_WRITE, PTE_PAGETABLE); 525 526 /* Map allocated stacks and msgbuf */ 527 pmap_map_chunk(l1pagetable, irqstack.pv_va, irqstack.pv_pa, 528 freemempos - irqstack.pv_va, 529 VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE); 530 531 /* Link and map the vector page */ 532 pmap_link_l2pt(l1pagetable, ARM_VECTORS_HIGH, 533 &kernel_pt_table[l2size - 1]); 534 pmap_map_entry(l1pagetable, ARM_VECTORS_HIGH, systempage.pv_pa, 535 VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE); 536 537 pmap_devmap_bootstrap(l1pagetable, pmap_devmap_bootstrap_table); 538 cpu_domains((DOMAIN_CLIENT << (PMAP_DOMAIN_KERNEL * 2)) | 539 DOMAIN_CLIENT); 540 setttb(kernel_l1pt.pv_pa); 541 cpu_tlb_flushID(); 542 cpu_domains(DOMAIN_CLIENT << (PMAP_DOMAIN_KERNEL * 2)); 543 cninit(); 544 physmem = memsize / PAGE_SIZE; 545 546 debugf("initarm: console initialized\n"); 547 debugf(" arg1 mdp = 0x%08x\n", (uint32_t)mdp); 548 debugf(" boothowto = 0x%08x\n", boothowto); 549 print_bootinfo(); 550 print_kernel_section_addr(); 551 print_kenv(); 552 553 /* 554 * Re-initialise decode windows 555 */ 556 if (soc_decode_win() != 0) 557 printf("WARNING: could not re-initialise decode windows! " 558 "Running with existing settings...\n"); 559 /* 560 * Pages were allocated during the secondary bootstrap for the 561 * stacks for different CPU modes. 562 * We must now set the r13 registers in the different CPU modes to 563 * point to these stacks. 564 * Since the ARM stacks use STMFD etc. we must set r13 to the top end 565 * of the stack memory. 566 */ 567 cpu_control(CPU_CONTROL_MMU_ENABLE, CPU_CONTROL_MMU_ENABLE); 568 set_stackptr(PSR_IRQ32_MODE, 569 irqstack.pv_va + IRQ_STACK_SIZE * PAGE_SIZE); 570 set_stackptr(PSR_ABT32_MODE, 571 abtstack.pv_va + ABT_STACK_SIZE * PAGE_SIZE); 572 set_stackptr(PSR_UND32_MODE, 573 undstack.pv_va + UND_STACK_SIZE * PAGE_SIZE); 574 575 /* 576 * We must now clean the cache again.... 577 * Cleaning may be done by reading new data to displace any 578 * dirty data in the cache. This will have happened in setttb() 579 * but since we are boot strapping the addresses used for the read 580 * may have just been remapped and thus the cache could be out 581 * of sync. A re-clean after the switch will cure this. 582 * After booting there are no gross reloations of the kernel thus 583 * this problem will not occur after initarm(). 584 */ 585 cpu_idcache_wbinv_all(); 586 587 /* Set stack for exception handlers */ 588 data_abort_handler_address = (u_int)data_abort_handler; 589 prefetch_abort_handler_address = (u_int)prefetch_abort_handler; 590 undefined_handler_address = (u_int)undefinedinstruction_bounce; 591 undefined_init(); 592 593 proc_linkup0(&proc0, &thread0); 594 thread0.td_kstack = kernelstack.pv_va; 595 thread0.td_kstack_pages = KSTACK_PAGES; 596 thread0.td_pcb = (struct pcb *) 597 (thread0.td_kstack + KSTACK_PAGES * PAGE_SIZE) - 1; 598 thread0.td_pcb->pcb_flags = 0; 599 thread0.td_frame = &proc0_tf; 600 pcpup->pc_curpcb = thread0.td_pcb; 601 602 arm_vector_init(ARM_VECTORS_HIGH, ARM_VEC_ALL); 603 604 dump_avail[0] = 0; 605 dump_avail[1] = memsize; 606 dump_avail[2] = 0; 607 dump_avail[3] = 0; 608 609 pmap_bootstrap(freemempos, pmap_bootstrap_lastaddr, &kernel_l1pt); 610 msgbufp = (void *)msgbufpv.pv_va; 611 msgbufinit(msgbufp, MSGBUF_SIZE); 612 mutex_init(); 613 614 /* 615 * Prepare map of physical memory regions available to vm subsystem. 616 * If metadata pointer doesn't point to a valid address, use hardcoded 617 * values. 618 */ 619 physmap_init((mdp != NULL) ? 0 : 1); 620 621 /* Do basic tuning, hz etc */ 622 init_param1(); 623 init_param2(physmem); 624 kdb_init(); 625 return ((void *)(kernelstack.pv_va + USPACE_SVC_STACK_TOP - 626 sizeof(struct pcb))); 627} 628 629struct arm32_dma_range * 630bus_dma_get_range(void) 631{ 632 633 return (NULL); 634} 635 636int 637bus_dma_get_range_nb(void) 638{ 639 640 return (0); 641} 642