smdk2800_machdep.c revision 1.15
1 /* $NetBSD: smdk2800_machdep.c,v 1.15 2003/07/15 00:25:06 lukem Exp $ */ 2 3 /* 4 * Copyright (c) 2002 Fujitsu Component Limited 5 * Copyright (c) 2002 Genetec Corporation 6 * All rights reserved. 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. Neither the name of The Fujitsu Component Limited nor the name of 17 * Genetec corporation may not be used to endorse or promote products 18 * derived from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY FUJITSU COMPONENT LIMITED AND GENETEC 21 * CORPORATION ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, 22 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 23 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 24 * DISCLAIMED. IN NO EVENT SHALL FUJITSU COMPONENT LIMITED OR GENETEC 25 * CORPORATION BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 27 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 28 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 29 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 /* 36 * Copyright (c) 2001,2002 ARM Ltd 37 * All rights reserved. 38 * 39 * Redistribution and use in source and binary forms, with or without 40 * modification, are permitted provided that the following conditions 41 * are met: 42 * 1. Redistributions of source code must retain the above copyright 43 * notice, this list of conditions and the following disclaimer. 44 * 2. Redistributions in binary form must reproduce the above copyright 45 * notice, this list of conditions and the following disclaimer in the 46 * documentation and/or other materials provided with the distribution. 47 * 3. The name of the company may not be used to endorse or promote 48 * products derived from this software without specific prior written 49 * permission. 50 * 51 * THIS SOFTWARE IS PROVIDED BY ARM LTD ``AS IS'' AND 52 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 53 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 54 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL ARM LTD 55 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 56 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 57 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 58 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 59 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 60 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 61 * POSSIBILITY OF SUCH DAMAGE. 62 * 63 */ 64 65 /* 66 * Copyright (c) 1997,1998 Mark Brinicombe. 67 * Copyright (c) 1997,1998 Causality Limited. 68 * All rights reserved. 69 * 70 * Redistribution and use in source and binary forms, with or without 71 * modification, are permitted provided that the following conditions 72 * are met: 73 * 1. Redistributions of source code must retain the above copyright 74 * notice, this list of conditions and the following disclaimer. 75 * 2. Redistributions in binary form must reproduce the above copyright 76 * notice, this list of conditions and the following disclaimer in the 77 * documentation and/or other materials provided with the distribution. 78 * 3. All advertising materials mentioning features or use of this software 79 * must display the following acknowledgement: 80 * This product includes software developed by Mark Brinicombe 81 * for the NetBSD Project. 82 * 4. The name of the company nor the name of the author may be used to 83 * endorse or promote products derived from this software without specific 84 * prior written permission. 85 * 86 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 87 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 88 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 89 * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 90 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 91 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 92 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 93 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 94 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 95 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 96 * SUCH DAMAGE. 97 * 98 * Machine dependant functions for kernel setup for integrator board 99 * 100 * Created : 24/11/97 101 */ 102 103 /* 104 * Machine dependant functions for kernel setup for Samsung SMDK2800 105 * derived from integrator_machdep.c 106 */ 107 108 #include <sys/cdefs.h> 109 __KERNEL_RCSID(0, "$NetBSD: smdk2800_machdep.c,v 1.15 2003/07/15 00:25:06 lukem Exp $"); 110 111 #include "opt_ddb.h" 112 #include "opt_kgdb.h" 113 #include "opt_ipkdb.h" 114 #include "opt_pmap_debug.h" 115 #include "opt_md.h" 116 #include "pci.h" 117 118 #include <sys/param.h> 119 #include <sys/device.h> 120 #include <sys/systm.h> 121 #include <sys/kernel.h> 122 #include <sys/exec.h> 123 #include <sys/proc.h> 124 #include <sys/msgbuf.h> 125 #include <sys/reboot.h> 126 #include <sys/termios.h> 127 #include <sys/ksyms.h> 128 129 #include <uvm/uvm_extern.h> 130 131 #include <dev/cons.h> 132 #include <dev/md.h> 133 134 #include <machine/db_machdep.h> 135 #include <ddb/db_sym.h> 136 #include <ddb/db_extern.h> 137 #ifdef KGDB 138 #include <sys/kgdb.h> 139 #endif 140 141 #include <machine/bootconfig.h> 142 #include <machine/bus.h> 143 #include <machine/cpu.h> 144 #include <machine/frame.h> 145 #include <machine/intr.h> 146 #include <arm/undefined.h> 147 148 #include <arm/arm32/machdep.h> 149 150 #include <arm/s3c2xx0/s3c2800reg.h> 151 #include <arm/s3c2xx0/s3c2800var.h> 152 153 #include "ksyms.h" 154 155 #ifndef SDRAM_START 156 #define SDRAM_START S3C2800_DBANK0_START 157 #endif 158 #ifndef SDRAM_SIZE 159 #define SDRAM_SIZE (32*1024*1024) 160 #endif 161 162 /* 163 * Address to map I/O registers in early initialize stage. 164 */ 165 #define SMDK2800_IO_AREA_VBASE 0xfd000000 166 #define SMDK2800_VBASE_FREE 0xfd200000 167 168 /* Kernel text starts 2MB in from the bottom of the kernel address space. */ 169 #define KERNEL_TEXT_BASE (KERNEL_BASE + 0x00200000) 170 #define KERNEL_VM_BASE (KERNEL_BASE + 0x01000000) 171 172 /* 173 * The range 0xc1000000 - 0xccffffff is available for kernel VM space 174 * Core-logic registers and I/O mappings occupy 0xfd000000 - 0xffffffff 175 */ 176 #define KERNEL_VM_SIZE 0x0C000000 177 178 /* Memory disk support */ 179 #if defined(MEMORY_DISK_DYNAMIC) && defined(MEMORY_DISK_ROOT_ADDR) 180 #define DO_MEMORY_DISK 181 /* We have memory disk image outside of the kernel on ROM. */ 182 #ifdef MEMORY_DISK_ROOT_ROM 183 /* map the image directory and use read-only */ 184 #else 185 /* copy the image to RAM */ 186 #endif 187 #endif 188 189 190 /* 191 * Address to call from cpu_reset() to reset the machine. 192 * This is machine architecture dependant as it varies depending 193 * on where the ROM appears when you turn the MMU off. 194 */ 195 u_int cpu_reset_address = (u_int)0; 196 197 /* Define various stack sizes in pages */ 198 #define IRQ_STACK_SIZE 1 199 #define ABT_STACK_SIZE 1 200 #ifdef IPKDB 201 #define UND_STACK_SIZE 2 202 #else 203 #define UND_STACK_SIZE 1 204 #endif 205 206 BootConfig bootconfig; /* Boot config storage */ 207 char *boot_args = NULL; 208 char *boot_file = NULL; 209 210 vm_offset_t physical_start; 211 vm_offset_t physical_freestart; 212 vm_offset_t physical_freeend; 213 vm_offset_t physical_end; 214 u_int free_pages; 215 vm_offset_t pagetables_start; 216 int physmem = 0; 217 218 /*int debug_flags;*/ 219 #ifndef PMAP_STATIC_L1S 220 int max_processes = 64; /* Default number */ 221 #endif /* !PMAP_STATIC_L1S */ 222 223 /* Physical and virtual addresses for some global pages */ 224 pv_addr_t systempage; 225 pv_addr_t irqstack; 226 pv_addr_t undstack; 227 pv_addr_t abtstack; 228 pv_addr_t kernelstack; 229 230 vm_offset_t msgbufphys; 231 232 extern u_int data_abort_handler_address; 233 extern u_int prefetch_abort_handler_address; 234 extern u_int undefined_handler_address; 235 236 #ifdef PMAP_DEBUG 237 extern int pmap_debug_level; 238 #endif 239 240 #define KERNEL_PT_SYS 0 /* L2 table for mapping zero page */ 241 #define KERNEL_PT_KERNEL 1 /* L2 table for mapping kernel */ 242 #define KERNEL_PT_KERNEL_NUM 2 /* L2 tables for mapping kernel VM */ 243 244 #define KERNEL_PT_VMDATA (KERNEL_PT_KERNEL + KERNEL_PT_KERNEL_NUM) 245 246 #define KERNEL_PT_VMDATA_NUM 4 /* start with 16MB of KVM */ 247 #define NUM_KERNEL_PTS (KERNEL_PT_VMDATA + KERNEL_PT_VMDATA_NUM) 248 249 pv_addr_t kernel_pt_table[NUM_KERNEL_PTS]; 250 251 struct user *proc0paddr; 252 253 /* Prototypes */ 254 255 void consinit(void); 256 void kgdb_port_init(void); 257 258 static int 259 bootstrap_bs_map(void *t, bus_addr_t bpa, bus_size_t size, 260 int cacheable, bus_space_handle_t * bshp); 261 static void map_builtin_peripherals(void); 262 static void copy_io_area_map(pd_entry_t * new_pd); 263 264 /* A load of console goo. */ 265 #include "vga.h" 266 #if NVGA > 0 267 #include <dev/ic/mc6845reg.h> 268 #include <dev/ic/pcdisplayvar.h> 269 #include <dev/ic/vgareg.h> 270 #include <dev/ic/vgavar.h> 271 #endif 272 273 #include "com.h" 274 #if NCOM > 0 275 #include <dev/ic/comreg.h> 276 #include <dev/ic/comvar.h> 277 #endif 278 279 #include "sscom.h" 280 #if NSSCOM > 0 281 #include "opt_sscom.h" 282 #include <arm/s3c2xx0/sscom_var.h> 283 #endif 284 285 /* 286 * Define the default console speed for the board. This is generally 287 * what the firmware provided with the board defaults to. 288 */ 289 #ifndef CONSPEED 290 #define CONSPEED B115200 /* TTYDEF_SPEED */ 291 #endif 292 #ifndef CONMODE 293 #define CONMODE ((TTYDEF_CFLAG & ~(CSIZE | CSTOPB | PARENB)) | CS8) /* 8N1 */ 294 #endif 295 296 int comcnspeed = CONSPEED; 297 int comcnmode = CONMODE; 298 299 struct bus_space bootstrap_bs_tag; 300 301 /* 302 * void cpu_reboot(int howto, char *bootstr) 303 * 304 * Reboots the system 305 * 306 * Deal with any syncing, unmounting, dumping and shutdown hooks, 307 * then reset the CPU. 308 */ 309 void 310 cpu_reboot(int howto, char *bootstr) 311 { 312 313 cpu_reset_address = vtophys((u_int)s3c2800_softreset); 314 315 /* 316 * If we are still cold then hit the air brakes 317 * and crash to earth fast 318 */ 319 if (cold) { 320 doshutdownhooks(); 321 printf("The operating system has halted.\n"); 322 printf("Please press any key to reboot.\n\n"); 323 cngetc(); 324 printf("rebooting...\n"); 325 cpu_reset(); 326 /* NOTREACHED */ 327 } 328 /* Disable console buffering */ 329 330 /* 331 * If RB_NOSYNC was not specified sync the discs. 332 * Note: Unless cold is set to 1 here, syslogd will die during the 333 * unmount. It looks like syslogd is getting woken up only to find 334 * that it cannot page part of the binary in as the filesystem has 335 * been unmounted. 336 */ 337 if (!(howto & RB_NOSYNC)) 338 bootsync(); 339 340 /* Say NO to interrupts */ 341 splhigh(); 342 343 /* Do a dump if requested. */ 344 if ((howto & (RB_DUMP | RB_HALT)) == RB_DUMP) 345 dumpsys(); 346 347 /* Run any shutdown hooks */ 348 doshutdownhooks(); 349 350 /* Make sure IRQ's are disabled */ 351 IRQdisable; 352 353 if (howto & RB_HALT) { 354 printf("The operating system has halted.\n"); 355 printf("Please press any key to reboot.\n\n"); 356 cngetc(); 357 } 358 printf("rebooting...\n"); 359 cpu_reset(); 360 /* NOTREACHED */ 361 } 362 #define ioreg_write8(a,v) (*(volatile uint8_t *)(a)=(v)) 363 364 /* 365 * u_int initarm(...) 366 * 367 * Initial entry point on startup. This gets called before main() is 368 * entered. 369 * It should be responsible for setting up everything that must be 370 * in place when main is called. 371 * This includes 372 * Taking a copy of the boot configuration structure. 373 * Initialising the physical console so characters can be printed. 374 * Setting up page tables for the kernel 375 * Relocating the kernel to the bottom of physical memory 376 */ 377 378 u_int 379 initarm(void *arg) 380 { 381 int loop; 382 int loop1; 383 u_int l1pagetable; 384 extern int etext asm("_etext"); 385 extern int end asm("_end"); 386 pv_addr_t kernel_l1pt; 387 struct s3c2800_softc temp_softc; /* used to initialize IO regs */ 388 int progress_counter = 0; 389 390 #ifdef DO_MEMORY_DISK 391 vm_offset_t md_root_start; 392 #define MD_ROOT_SIZE (MEMORY_DISK_ROOT_SIZE * DEV_BSIZE) 393 #endif 394 395 #define gpio_read8(reg) bus_space_read_1(temp_softc.sc_sx.sc_iot, \ 396 temp_softc.sc_sx.sc_gpio_ioh, (reg)) 397 398 #define LEDSTEP() __LED(progress_counter++) 399 400 #define pdatc (*(volatile uint8_t *)(S3C2800_GPIO_BASE+GPIO_PDATC)) 401 #define __LED(x) (pdatc = (pdatc & ~0x07) | (~(x) & 0x07)) 402 403 LEDSTEP(); 404 /* 405 * Heads up ... Setup the CPU / MMU / TLB functions 406 */ 407 if (set_cpufuncs()) 408 panic("cpu not recognized!"); 409 410 LEDSTEP(); 411 412 map_builtin_peripherals(); 413 414 /* 415 * prepare fake bus space tag 416 */ 417 bootstrap_bs_tag = s3c2xx0_bs_tag; 418 bootstrap_bs_tag.bs_map = bootstrap_bs_map; 419 s3c2xx0_softc = &temp_softc.sc_sx; 420 s3c2xx0_softc->sc_iot = &bootstrap_bs_tag; 421 422 bootstrap_bs_map(&bootstrap_bs_tag, S3C2800_GPIO_BASE, 423 S3C2800_GPIO_SIZE, 0, &temp_softc.sc_sx.sc_gpio_ioh); 424 bootstrap_bs_map(&bootstrap_bs_tag, S3C2800_INTCTL_BASE, 425 S3C2800_INTCTL_SIZE, 0, &temp_softc.sc_sx.sc_intctl_ioh); 426 bootstrap_bs_map(&bootstrap_bs_tag, S3C2800_CLKMAN_BASE, 427 S3C2800_CLKMAN_SIZE, 0, &temp_softc.sc_sx.sc_clkman_ioh); 428 429 #undef __LED 430 #define __LED(x) \ 431 bus_space_write_1(&bootstrap_bs_tag, \ 432 temp_softc.sc_sx.sc_gpio_ioh, \ 433 GPIO_PDATC, (~(x) & 0x07) | \ 434 (bus_space_read_1(&bootstrap_bs_tag, \ 435 temp_softc.sc_sx.sc_gpio_ioh, GPIO_PDATC ) & ~0x07)) 436 437 LEDSTEP(); 438 439 /* Disable all peripheral interrupts */ 440 bus_space_write_4(&bootstrap_bs_tag, temp_softc.sc_sx.sc_intctl_ioh, 441 INTCTL_INTMSK, 0); 442 443 s3c2800_clock_freq(&temp_softc); 444 445 consinit(); 446 #ifdef VERBOSE_INIT_ARM 447 printf("consinit done\n"); 448 #endif 449 450 #ifdef KGDB 451 LEDSTEP(); 452 kgdb_port_init(); 453 #endif 454 LEDSTEP(); 455 456 #ifdef VERBOSE_INIT_ARM 457 /* Talk to the user */ 458 printf("\nNetBSD/evbarm (SMDK2800) booting ...\n"); 459 #endif 460 461 /* 462 * Ok we have the following memory map 463 * 464 * Physical Address Range Description 465 * ----------------------- ---------------------------------- 466 * 0x00000000 - 0x00ffffff Intel flash Memory (16MB) 467 * 0x02000000 - 0x020fffff AMD flash Memory (1MB) 468 * or (depend on DIPSW setting) 469 * 0x00000000 - 0x000fffff AMD flash Memory (1MB) 470 * 0x02000000 - 0x02ffffff Intel flash Memory (16MB) 471 * 472 * 0x08000000 - 0x09ffffff SDRAM (32MB) 473 * 0x20000000 - 0x3fffffff PCI space 474 * 475 * The initarm() has the responsibility for creating the kernel 476 * page tables. 477 * It must also set up various memory pointers that are used 478 * by pmap etc. 479 */ 480 481 /* Fake bootconfig structure for the benefit of pmap.c */ 482 /* XXX must make the memory description h/w independent */ 483 bootconfig.dramblocks = 1; 484 bootconfig.dram[0].address = SDRAM_START; 485 bootconfig.dram[0].pages = SDRAM_SIZE / PAGE_SIZE; 486 487 /* 488 * Set up the variables that define the availablilty of 489 * physical memory. For now, we're going to set 490 * physical_freestart to 0x08200000 (where the kernel 491 * was loaded), and allocate the memory we need downwards. 492 * If we get too close to the bottom of SDRAM, we 493 * will panic. We will update physical_freestart and 494 * physical_freeend later to reflect what pmap_bootstrap() 495 * wants to see. 496 * 497 * XXX pmap_bootstrap() needs an enema. 498 */ 499 physical_start = bootconfig.dram[0].address; 500 physical_end = physical_start + (bootconfig.dram[0].pages * PAGE_SIZE); 501 502 #if DO_MEMORY_DISK 503 #ifdef MEMORY_DISK_ROOT_ROM 504 md_root_start = MEMORY_DISK_ROOT_ADDR; 505 boothowto |= RB_RDONLY; 506 #else 507 /* Reserve physmem for ram disk */ 508 md_root_start = ((physical_end - MD_ROOT_SIZE) & ~(L1_S_SIZE-1)); 509 printf("Reserve %ld bytes for memory disk\n", 510 physical_end - md_root_start); 511 /* copy fs contents */ 512 memcpy((void *)md_root_start, (void *)MEMORY_DISK_ROOT_ADDR, 513 MD_ROOT_SIZE); 514 physical_end = md_root_start; 515 #endif 516 #endif 517 518 physical_freestart = 0x08000000UL; /* XXX */ 519 physical_freeend = 0x08200000UL; 520 521 physmem = (physical_end - physical_start) / PAGE_SIZE; 522 523 #ifdef VERBOSE_INIT_ARM 524 /* Tell the user about the memory */ 525 printf("physmemory: %d pages at 0x%08lx -> 0x%08lx\n", physmem, 526 physical_start, physical_end - 1); 527 #endif 528 529 /* 530 * XXX 531 * Okay, the kernel starts 2MB in from the bottom of physical 532 * memory. We are going to allocate our bootstrap pages downwards 533 * from there. 534 * 535 * We need to allocate some fixed page tables to get the kernel 536 * going. We allocate one page directory and a number of page 537 * tables and store the physical addresses in the kernel_pt_table 538 * array. 539 * 540 * The kernel page directory must be on a 16K boundary. The page 541 * tables must be on 4K bounaries. What we do is allocate the 542 * page directory on the first 16K boundary that we encounter, and 543 * the page tables on 4K boundaries otherwise. Since we allocate 544 * at least 3 L2 page tables, we are guaranteed to encounter at 545 * least one 16K aligned region. 546 */ 547 548 #ifdef VERBOSE_INIT_ARM 549 printf("Allocating page tables\n"); 550 #endif 551 552 free_pages = (physical_freeend - physical_freestart) / PAGE_SIZE; 553 554 #ifdef VERBOSE_INIT_ARM 555 printf("freestart = 0x%08lx, free_pages = %d (0x%08x)\n", 556 physical_freestart, free_pages, free_pages); 557 #endif 558 559 /* Define a macro to simplify memory allocation */ 560 #define valloc_pages(var, np) \ 561 alloc_pages((var).pv_pa, (np)); \ 562 (var).pv_va = KERNEL_BASE + (var).pv_pa - physical_start; 563 564 #define alloc_pages(var, np) \ 565 physical_freeend -= ((np) * PAGE_SIZE); \ 566 if (physical_freeend < physical_freestart) \ 567 panic("initarm: out of memory"); \ 568 (var) = physical_freeend; \ 569 free_pages -= (np); \ 570 memset((char *)(var), 0, ((np) * PAGE_SIZE)); 571 572 loop1 = 0; 573 kernel_l1pt.pv_pa = 0; 574 for (loop = 0; loop <= NUM_KERNEL_PTS; ++loop) { 575 /* Are we 16KB aligned for an L1 ? */ 576 if (((physical_freeend - L1_TABLE_SIZE) & (L1_TABLE_SIZE - 1)) == 0 577 && kernel_l1pt.pv_pa == 0) { 578 valloc_pages(kernel_l1pt, L1_TABLE_SIZE / PAGE_SIZE); 579 } else { 580 valloc_pages(kernel_pt_table[loop1], 581 L2_TABLE_SIZE / PAGE_SIZE); 582 ++loop1; 583 } 584 } 585 586 /* This should never be able to happen but better confirm that. */ 587 if (!kernel_l1pt.pv_pa || (kernel_l1pt.pv_pa & (L1_TABLE_SIZE-1)) != 0) 588 panic("initarm: Failed to align the kernel page directory\n"); 589 590 /* 591 * Allocate a page for the system page mapped to V0x00000000 592 * This page will just contain the system vectors and can be 593 * shared by all processes. 594 */ 595 alloc_pages(systempage.pv_pa, 1); 596 597 /* Allocate stacks for all modes */ 598 valloc_pages(irqstack, IRQ_STACK_SIZE); 599 valloc_pages(abtstack, ABT_STACK_SIZE); 600 valloc_pages(undstack, UND_STACK_SIZE); 601 valloc_pages(kernelstack, UPAGES); 602 603 #ifdef VERBOSE_INIT_ARM 604 printf("IRQ stack: p0x%08lx v0x%08lx\n", irqstack.pv_pa, 605 irqstack.pv_va); 606 printf("ABT stack: p0x%08lx v0x%08lx\n", abtstack.pv_pa, 607 abtstack.pv_va); 608 printf("UND stack: p0x%08lx v0x%08lx\n", undstack.pv_pa, 609 undstack.pv_va); 610 printf("SVC stack: p0x%08lx v0x%08lx\n", kernelstack.pv_pa, 611 kernelstack.pv_va); 612 #endif 613 614 alloc_pages(msgbufphys, round_page(MSGBUFSIZE) / PAGE_SIZE); 615 616 LEDSTEP(); 617 618 /* 619 * Ok we have allocated physical pages for the primary kernel 620 * page tables 621 */ 622 623 #ifdef VERBOSE_INIT_ARM 624 printf("Creating L1 page table at 0x%08lx\n", kernel_l1pt.pv_pa); 625 #endif 626 627 /* 628 * Now we start construction of the L1 page table 629 * We start by mapping the L2 page tables into the L1. 630 * This means that we can replace L1 mappings later on if necessary 631 */ 632 l1pagetable = kernel_l1pt.pv_pa; 633 634 /* Map the L2 pages tables in the L1 page table */ 635 pmap_link_l2pt(l1pagetable, 0x00000000, 636 &kernel_pt_table[KERNEL_PT_SYS]); 637 for (loop = 0; loop < KERNEL_PT_KERNEL_NUM; loop++) 638 pmap_link_l2pt(l1pagetable, KERNEL_BASE + loop * 0x00400000, 639 &kernel_pt_table[KERNEL_PT_KERNEL + loop]); 640 for (loop = 0; loop < KERNEL_PT_VMDATA_NUM; loop++) 641 pmap_link_l2pt(l1pagetable, KERNEL_VM_BASE + loop * 0x00400000, 642 &kernel_pt_table[KERNEL_PT_VMDATA + loop]); 643 644 /* update the top of the kernel VM */ 645 pmap_curmaxkvaddr = 646 KERNEL_VM_BASE + (KERNEL_PT_VMDATA_NUM * 0x00400000); 647 648 #ifdef VERBOSE_INIT_ARM 649 printf("Mapping kernel\n"); 650 #endif 651 652 /* Now we fill in the L2 pagetable for the kernel static code/data */ 653 { 654 size_t textsize = (uintptr_t)&etext - KERNEL_TEXT_BASE; 655 size_t totalsize = (uintptr_t)&end - KERNEL_TEXT_BASE; 656 u_int logical; 657 658 textsize = (textsize + PGOFSET) & ~PGOFSET; 659 totalsize = (totalsize + PGOFSET) & ~PGOFSET; 660 661 logical = 0x00200000; /* offset of kernel in RAM */ 662 663 logical += pmap_map_chunk(l1pagetable, KERNEL_BASE + logical, 664 physical_start + logical, textsize, 665 VM_PROT_READ | VM_PROT_WRITE, PTE_CACHE); 666 logical += pmap_map_chunk(l1pagetable, KERNEL_BASE + logical, 667 physical_start + logical, totalsize - textsize, 668 VM_PROT_READ | VM_PROT_WRITE, PTE_CACHE); 669 } 670 671 #ifdef VERBOSE_INIT_ARM 672 printf("Constructing L2 page tables\n"); 673 #endif 674 675 /* Map the stack pages */ 676 pmap_map_chunk(l1pagetable, irqstack.pv_va, irqstack.pv_pa, 677 IRQ_STACK_SIZE * PAGE_SIZE, VM_PROT_READ | VM_PROT_WRITE, 678 PTE_CACHE); 679 pmap_map_chunk(l1pagetable, abtstack.pv_va, abtstack.pv_pa, 680 ABT_STACK_SIZE * PAGE_SIZE, VM_PROT_READ | VM_PROT_WRITE, 681 PTE_CACHE); 682 pmap_map_chunk(l1pagetable, undstack.pv_va, undstack.pv_pa, 683 UND_STACK_SIZE * PAGE_SIZE, VM_PROT_READ | VM_PROT_WRITE, 684 PTE_CACHE); 685 pmap_map_chunk(l1pagetable, kernelstack.pv_va, kernelstack.pv_pa, 686 UPAGES * PAGE_SIZE, VM_PROT_READ | VM_PROT_WRITE, PTE_CACHE); 687 688 pmap_map_chunk(l1pagetable, kernel_l1pt.pv_va, kernel_l1pt.pv_pa, 689 L1_TABLE_SIZE, VM_PROT_READ | VM_PROT_WRITE, PTE_PAGETABLE); 690 691 for (loop = 0; loop < NUM_KERNEL_PTS; ++loop) { 692 pmap_map_chunk(l1pagetable, kernel_pt_table[loop].pv_va, 693 kernel_pt_table[loop].pv_pa, L2_TABLE_SIZE, 694 VM_PROT_READ|VM_PROT_WRITE, PTE_PAGETABLE); 695 } 696 697 /* Map the vector page. */ 698 #if 1 699 /* MULTI-ICE requires that page 0 is NC/NB so that it can download the 700 * cache-clean code there. */ 701 pmap_map_entry(l1pagetable, vector_page, systempage.pv_pa, 702 VM_PROT_READ | VM_PROT_WRITE, PTE_NOCACHE); 703 #else 704 pmap_map_entry(l1pagetable, vector_page, systempage.pv_pa, 705 VM_PROT_READ | VM_PROT_WRITE, PTE_CACHE); 706 #endif 707 708 #ifdef MEMORY_DISK_DYNAMIC 709 /* map MD root image */ 710 bootstrap_bs_map(&bootstrap_bs_tag, md_root_start, MD_ROOT_SIZE, 711 BUS_SPACE_MAP_CACHEABLE | BUS_SPACE_MAP_LINEAR, 712 (bus_space_handle_t *)&md_root_start); 713 714 md_root_setconf((void *)md_root_start, MD_ROOT_SIZE); 715 #endif /* MEMORY_DISK_DYNAMIC */ 716 /* 717 * map integrated peripherals at same address in l1pagetable 718 * so that we can continue to use console. 719 */ 720 copy_io_area_map((pd_entry_t *)l1pagetable); 721 722 /* 723 * Now we have the real page tables in place so we can switch to them. 724 * Once this is done we will be running with the REAL kernel page 725 * tables. 726 */ 727 728 /* 729 * Update the physical_freestart/physical_freeend/free_pages 730 * variables. 731 */ 732 { 733 physical_freestart = physical_start + 734 (((((uintptr_t)&end) + PGOFSET) & ~PGOFSET) - KERNEL_BASE); 735 physical_freeend = physical_end; 736 free_pages = 737 (physical_freeend - physical_freestart) / PAGE_SIZE; 738 } 739 740 /* Switch tables */ 741 #ifdef VERBOSE_INIT_ARM 742 printf("freestart = 0x%08lx, free_pages = %d (0x%x)\n", 743 physical_freestart, free_pages, free_pages); 744 printf("switching to new L1 page table @%#lx...", kernel_l1pt.pv_pa); 745 #endif 746 LEDSTEP(); 747 cpu_domains((DOMAIN_CLIENT << (PMAP_DOMAIN_KERNEL*2)) | DOMAIN_CLIENT); 748 setttb(kernel_l1pt.pv_pa); 749 cpu_tlb_flushID(); 750 cpu_domains(DOMAIN_CLIENT << (PMAP_DOMAIN_KERNEL*2)); 751 752 /* 753 * Moved from cpu_startup() as data_abort_handler() references 754 * this during uvm init 755 */ 756 proc0paddr = (struct user *)kernelstack.pv_va; 757 lwp0.l_addr = proc0paddr; 758 759 #ifdef VERBOSE_INIT_ARM 760 printf("done!\n"); 761 #endif 762 763 #if 0 764 /* 765 * The IFPGA registers have just moved. 766 * Detach the diagnostic serial port and reattach at the new address. 767 */ 768 plcomcndetach(); 769 /* 770 * XXX this should only be done in main() but it useful to 771 * have output earlier ... 772 */ 773 consinit(); 774 #endif 775 776 LEDSTEP(); 777 #ifdef VERBOSE_INIT_ARM 778 printf("bootstrap done.\n"); 779 #endif 780 781 arm32_vector_init(ARM_VECTORS_LOW, ARM_VEC_ALL); 782 783 /* 784 * Pages were allocated during the secondary bootstrap for the 785 * stacks for different CPU modes. 786 * We must now set the r13 registers in the different CPU modes to 787 * point to these stacks. 788 * Since the ARM stacks use STMFD etc. we must set r13 to the top end 789 * of the stack memory. 790 */ 791 #ifdef VERBOSE_INIT_ARM 792 printf("init subsystems: stacks "); 793 #endif 794 795 set_stackptr(PSR_IRQ32_MODE, 796 irqstack.pv_va + IRQ_STACK_SIZE * PAGE_SIZE); 797 set_stackptr(PSR_ABT32_MODE, 798 abtstack.pv_va + ABT_STACK_SIZE * PAGE_SIZE); 799 set_stackptr(PSR_UND32_MODE, 800 undstack.pv_va + UND_STACK_SIZE * PAGE_SIZE); 801 802 LEDSTEP(); 803 804 /* 805 * Well we should set a data abort handler. 806 * Once things get going this will change as we will need a proper 807 * handler. 808 * Until then we will use a handler that just panics but tells us 809 * why. 810 * Initialisation of the vectors will just panic on a data abort. 811 * This just fills in a slighly better one. 812 */ 813 #ifdef VERBOSE_INIT_ARM 814 printf("vectors "); 815 #endif 816 data_abort_handler_address = (u_int)data_abort_handler; 817 prefetch_abort_handler_address = (u_int)prefetch_abort_handler; 818 undefined_handler_address = (u_int)undefinedinstruction_bounce; 819 820 /* Initialise the undefined instruction handlers */ 821 #ifdef VERBOSE_INIT_ARM 822 printf("undefined "); 823 #endif 824 undefined_init(); 825 826 LEDSTEP(); 827 828 /* Load memory into UVM. */ 829 #ifdef VERBOSE_INIT_ARM 830 printf("page "); 831 #endif 832 uvm_setpagesize(); /* initialize PAGE_SIZE-dependent variables */ 833 uvm_page_physload(atop(physical_freestart), atop(physical_freeend), 834 atop(physical_freestart), atop(physical_freeend), 835 VM_FREELIST_DEFAULT); 836 837 LEDSTEP(); 838 /* Boot strap pmap telling it where the kernel page table is */ 839 #ifdef VERBOSE_INIT_ARM 840 printf("pmap "); 841 #endif 842 pmap_bootstrap((pd_entry_t *)kernel_l1pt.pv_va, KERNEL_VM_BASE, 843 KERNEL_VM_BASE + KERNEL_VM_SIZE); 844 845 LEDSTEP(); 846 847 /* Setup the IRQ system */ 848 #ifdef VERBOSE_INIT_ARM 849 printf("irq "); 850 #endif 851 /* XXX irq_init(); */ 852 853 #ifdef VERBOSE_INIT_ARM 854 printf("done.\n"); 855 #endif 856 857 #ifdef BOOTHOWTO_INIT 858 boothowto |= BOOTHOWTO_INIT; 859 #endif 860 { 861 uint8_t gpio = ~gpio_read8(GPIO_PDATF); 862 863 if (gpio & (1<<5)) /* SW3 */ 864 boothowto ^= RB_SINGLE; 865 if (gpio & (1<<7)) /* SW7 */ 866 boothowto ^= RB_KDB; 867 #ifdef VERBOSE_INIT_ARM 868 printf( "sw: %x boothowto: %x\n", gpio, boothowto ); 869 #endif 870 } 871 872 #ifdef IPKDB 873 /* Initialise ipkdb */ 874 ipkdb_init(); 875 if (boothowto & RB_KDB) 876 ipkdb_connect(0); 877 #endif 878 879 #ifdef KGDB 880 if (boothowto & RB_KDB) { 881 kgdb_debug_init = 1; 882 kgdb_connect(1); 883 } 884 #endif 885 886 #if NKSYMS || defined(DDB) || defined(LKM) 887 /* Firmware doesn't load symbols. */ 888 ksyms_init(0, NULL, NULL); 889 #endif 890 891 #ifdef DDB 892 db_machine_init(); 893 if (boothowto & RB_KDB) 894 Debugger(); 895 #endif 896 897 /* We return the new stack pointer address */ 898 return (kernelstack.pv_va + USPACE_SVC_STACK_TOP); 899 } 900 901 void 902 consinit(void) 903 { 904 static int consinit_done = 0; 905 bus_space_tag_t iot = s3c2xx0_softc->sc_iot; 906 int pclk = s3c2xx0_softc->sc_pclk; 907 908 if (consinit_done != 0) 909 return; 910 911 consinit_done = 1; 912 913 #if NSSCOM > 0 914 #ifdef SSCOM0CONSOLE 915 if (0 == s3c2800_sscom_cnattach(iot, 0, comcnspeed, 916 pclk, comcnmode)) 917 return; 918 #endif 919 #ifdef SSCOM1CONSOLE 920 if (0 == s3c2800_sscom_cnattach(iot, 1, comcnspeed, 921 pclk, comcnmode)) 922 return; 923 #endif 924 #endif /* NSSCOM */ 925 #if NCOM>0 && defined(CONCOMADDR) 926 if (comcnattach(&isa_io_bs_tag, CONCOMADDR, comcnspeed, 927 COM_FREQ, COM_TYPE_NORMAL, comcnmode)) 928 panic("can't init serial console @%x", CONCOMADDR); 929 return; 930 #endif 931 932 consinit_done = 0; 933 } 934 935 936 #ifdef KGDB 937 938 #if (NSSCOM > 0) 939 940 #ifdef KGDB_DEVNAME 941 const char kgdb_devname[] = KGDB_DEVNAME; 942 #else 943 const char kgdb_devname[] = ""; 944 #endif 945 946 #ifndef KGDB_DEVMODE 947 #define KGDB_DEVMODE ((TTYDEF_CFLAG & ~(CSIZE|CSTOPB|PARENB))|CS8) /* 8N1 */ 948 #endif 949 int kgdb_sscom_mode = KGDB_DEVMODE; 950 951 #endif /* NSSCOM */ 952 953 void 954 kgdb_port_init(void) 955 { 956 #if (NSSCOM > 0) 957 int unit = -1; 958 int pclk = s3c2xx0_softc->sc_pclk; 959 960 if (strcmp(kgdb_devname, "sscom0") == 0) 961 unit = 0; 962 else if (strcmp(kgdb_devname, "sscom1") == 0) 963 unit = 1; 964 965 if (unit >= 0) { 966 s3c2800_sscom_kgdb_attach(s3c2xx0_softc->sc_iot, 967 unit, kgdb_rate, pclk, kgdb_sscom_mode); 968 } 969 #endif 970 } 971 #endif 972 973 static __inline 974 pd_entry_t * 975 read_ttb(void) 976 { 977 long ttb; 978 979 __asm __volatile("mrc p15, 0, %0, c2, c0, 0" : "=r"(ttb)); 980 981 982 return (pd_entry_t *)(ttb & ~((1 << 14) - 1)); 983 } 984 985 986 static __inline void 987 writeback_dcache_line(vaddr_t va) 988 { 989 /* writeback Dcache line */ 990 /* we can't use cpu_dcache_wb_range() here, because cpufuncs for ARM9 991 * assume write-through cache, and always flush Dcache instead of 992 * cleaning it. Since Boot loader maps page table with write-back 993 * cached, we really need to clean Dcache. */ 994 asm("mcr p15, 0, %0, c7, c10, 1" 995 : : "r"(va)); 996 } 997 998 static __inline void 999 clean_dcache_line(vaddr_t va) 1000 { 1001 /* writeback and invalidate Dcache line */ 1002 asm("mcr p15, 0, %0, c7, c14, 1" 1003 : : "r"(va)); 1004 } 1005 1006 static vaddr_t section_free = SMDK2800_VBASE_FREE; 1007 1008 static void 1009 map_builtin_peripherals(void) 1010 { 1011 pd_entry_t *pagedir = read_ttb(); 1012 int i, sec; 1013 1014 for (i=0; i < 2; ++i) { 1015 1016 pmap_map_section((vaddr_t)pagedir, 1017 SMDK2800_IO_AREA_VBASE + (i <<L1_S_SHIFT), 1018 S3C2800_PERIPHERALS + (i << L1_S_SHIFT), 1019 VM_PROT_READ | VM_PROT_WRITE, PTE_NOCACHE); 1020 1021 sec = (SMDK2800_IO_AREA_VBASE >> L1_S_SHIFT) + i; 1022 writeback_dcache_line((vaddr_t)&pagedir[sec]); 1023 } 1024 1025 cpu_drain_writebuf(); 1026 cpu_tlb_flushD(); 1027 } 1028 1029 /* 1030 * simple memory mapping function used in early bootstrap stage 1031 * before pmap is initialized. 1032 * This assumes only peripheral registers to map. they are mapped to 1033 * fixed address with section mapping. 1034 */ 1035 static int 1036 bootstrap_bs_map(void *t, bus_addr_t bpa, bus_size_t size, 1037 int flag, bus_space_handle_t * bshp) 1038 { 1039 long offset; 1040 int modified = 0; 1041 pd_entry_t *pagedir = read_ttb(); 1042 /* This assumes PA==VA for page directory */ 1043 1044 if (S3C2800_PERIPHERALS <= bpa && bpa < S3C2800_PERIPHERALS + 0x200000) { 1045 offset = bpa - S3C2800_PERIPHERALS; 1046 if (offset < 0 || 2 * L1_S_SIZE < offset) 1047 panic("bootstrap_bs_map: can't map"); 1048 *bshp = (bus_space_handle_t)(SMDK2800_IO_AREA_VBASE + offset); 1049 } else { 1050 vaddr_t va; 1051 bus_addr_t pa; 1052 int cacheable = flag & BUS_SPACE_MAP_CACHEABLE; 1053 1054 1055 size = (size + L1_S_OFFSET) & ~L1_S_OFFSET; 1056 pa = bpa & ~L1_S_OFFSET; 1057 offset = bpa - pa; 1058 1059 va = section_free; 1060 while (size) { 1061 pmap_map_section((vaddr_t)pagedir, va, 1062 pa, VM_PROT_READ | VM_PROT_WRITE, 1063 cacheable ? PTE_CACHE : PTE_NOCACHE); 1064 writeback_dcache_line((vaddr_t)& pagedir[va >> L1_S_SHIFT]); 1065 va += L1_S_SIZE; 1066 pa += L1_S_SIZE; 1067 size -= L1_S_SIZE; 1068 } 1069 1070 *bshp = (bus_space_handle_t)(section_free + offset); 1071 section_free = va; 1072 } 1073 1074 1075 if (modified) { 1076 1077 cpu_drain_writebuf(); 1078 cpu_tlb_flushD(); 1079 } 1080 return (0); 1081 } 1082 1083 static void 1084 copy_io_area_map(pd_entry_t * new_pd) 1085 { 1086 pd_entry_t *cur_pd = read_ttb(); 1087 int sec; 1088 1089 for (sec = SMDK2800_IO_AREA_VBASE >> L1_S_SHIFT; 1090 sec < (section_free >> L1_S_SHIFT); ++sec) { 1091 new_pd[sec] = cur_pd[sec]; 1092 } 1093 } 1094
Indexes created Wed Oct 01 13:09:50 GMT 2025