smdk2800_machdep.c revision 1.2
1 /* $NetBSD: smdk2800_machdep.c,v 1.2 2003/04/02 03:49:26 thorpej 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 * Machine dependant functions for kernel setup for Samsung SMDK2800 37 * derived from integrator_machdep.c 38 */ 39 40 /* 41 * Copyright (c) 2001,2002 ARM Ltd 42 * All rights reserved. 43 * 44 * Redistribution and use in source and binary forms, with or without 45 * modification, are permitted provided that the following conditions 46 * are met: 47 * 1. Redistributions of source code must retain the above copyright 48 * notice, this list of conditions and the following disclaimer. 49 * 2. Redistributions in binary form must reproduce the above copyright 50 * notice, this list of conditions and the following disclaimer in the 51 * documentation and/or other materials provided with the distribution. 52 * 3. The name of the company may not be used to endorse or promote 53 * products derived from this software without specific prior written 54 * permission. 55 * 56 * THIS SOFTWARE IS PROVIDED BY ARM LTD ``AS IS'' AND 57 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 58 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 59 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL ARM LTD 60 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 61 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 62 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 63 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 64 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 65 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 66 * POSSIBILITY OF SUCH DAMAGE. 67 * 68 */ 69 70 /* 71 * Copyright (c) 1997,1998 Mark Brinicombe. 72 * Copyright (c) 1997,1998 Causality Limited. 73 * All rights reserved. 74 * 75 * Redistribution and use in source and binary forms, with or without 76 * modification, are permitted provided that the following conditions 77 * are met: 78 * 1. Redistributions of source code must retain the above copyright 79 * notice, this list of conditions and the following disclaimer. 80 * 2. Redistributions in binary form must reproduce the above copyright 81 * notice, this list of conditions and the following disclaimer in the 82 * documentation and/or other materials provided with the distribution. 83 * 3. All advertising materials mentioning features or use of this software 84 * must display the following acknowledgement: 85 * This product includes software developed by Mark Brinicombe 86 * for the NetBSD Project. 87 * 4. The name of the company nor the name of the author may be used to 88 * endorse or promote products derived from this software without specific 89 * prior written permission. 90 * 91 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 92 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 93 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 94 * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 95 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 96 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 97 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 98 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 99 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 100 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 101 * SUCH DAMAGE. 102 * 103 * Machine dependant functions for kernel setup for integrator board 104 * 105 * Created : 24/11/97 106 */ 107 108 #include "opt_ddb.h" 109 #include "opt_kgdb.h" 110 #include "opt_ipkdb.h" 111 #include "opt_pmap_debug.h" 112 #include "opt_md.h" 113 #include "pci.h" 114 115 #include <sys/param.h> 116 #include <sys/device.h> 117 #include <sys/systm.h> 118 #include <sys/kernel.h> 119 #include <sys/exec.h> 120 #include <sys/proc.h> 121 #include <sys/msgbuf.h> 122 #include <sys/reboot.h> 123 #include <sys/termios.h> 124 125 #include <uvm/uvm_extern.h> 126 127 #include <dev/cons.h> 128 #include <dev/md.h> 129 130 #include <machine/db_machdep.h> 131 #include <ddb/db_sym.h> 132 #include <ddb/db_extern.h> 133 #ifdef KGDB 134 #include <sys/kgdb.h> 135 #endif 136 137 #include <machine/bootconfig.h> 138 #include <machine/bus.h> 139 #include <machine/cpu.h> 140 #include <machine/frame.h> 141 #include <machine/intr.h> 142 #include <arm/undefined.h> 143 144 #include <arm/arm32/machdep.h> 145 146 #include <arm/s3c2xx0/s3c2800reg.h> 147 #include <arm/s3c2xx0/s3c2800var.h> 148 149 #ifndef SDRAM_START 150 #define SDRAM_START S3C2800_DBANK0_START 151 #endif 152 #ifndef SDRAM_SIZE 153 #define SDRAM_SIZE (32*1024*1024) 154 #endif 155 156 /* 157 * Address to map I/O registers in early initialize stage. 158 */ 159 #define SMDK2800_IO_AREA_VBASE 0xfd000000 160 #define SMDK2800_VBASE_FREE 0xfd200000 161 162 /* 163 * Address to call from cpu_reset() to reset the machine. 164 * This is machine architecture dependant as it varies depending 165 * on where the ROM appears when you turn the MMU off. 166 */ 167 u_int cpu_reset_address = (u_int)0; 168 169 /* Define various stack sizes in pages */ 170 #define IRQ_STACK_SIZE 1 171 #define ABT_STACK_SIZE 1 172 #ifdef IPKDB 173 #define UND_STACK_SIZE 2 174 #else 175 #define UND_STACK_SIZE 1 176 #endif 177 178 BootConfig bootconfig; /* Boot config storage */ 179 char *boot_args = NULL; 180 char *boot_file = NULL; 181 182 vm_offset_t physical_start; 183 vm_offset_t physical_freestart; 184 vm_offset_t physical_freeend; 185 vm_offset_t physical_end; 186 u_int free_pages; 187 vm_offset_t pagetables_start; 188 int physmem = 0; 189 190 /*int debug_flags;*/ 191 #ifndef PMAP_STATIC_L1S 192 int max_processes = 64; /* Default number */ 193 #endif /* !PMAP_STATIC_L1S */ 194 195 /* Physical and virtual addresses for some global pages */ 196 pv_addr_t systempage; 197 pv_addr_t irqstack; 198 pv_addr_t undstack; 199 pv_addr_t abtstack; 200 pv_addr_t kernelstack; 201 202 vm_offset_t msgbufphys; 203 204 extern u_int data_abort_handler_address; 205 extern u_int prefetch_abort_handler_address; 206 extern u_int undefined_handler_address; 207 208 #ifdef PMAP_DEBUG 209 extern int pmap_debug_level; 210 #endif 211 212 #define KERNEL_PT_SYS 0 /* L2 table for mapping zero page */ 213 #define KERNEL_PT_KERNEL 1 /* L2 table for mapping kernel */ 214 #define KERNEL_PT_KERNEL_NUM 2 /* L2 tables for mapping kernel VM */ 215 216 #define KERNEL_PT_VMDATA (KERNEL_PT_KERNEL + KERNEL_PT_KERNEL_NUM) 217 218 #define KERNEL_PT_VMDATA_NUM 4 /* start with 16MB of KVM */ 219 #define NUM_KERNEL_PTS (KERNEL_PT_VMDATA + KERNEL_PT_VMDATA_NUM) 220 221 pv_addr_t kernel_pt_table[NUM_KERNEL_PTS]; 222 223 struct user *proc0paddr; 224 225 #ifdef MEMORY_DISK_DYNAMIC 226 #define MD_ROOT_SIZE 4 /* in megabytes */ 227 #define MD_ROOT_START 0x400000/* MD root image in ROM */ 228 #endif 229 230 231 /* Prototypes */ 232 233 void consinit(void); 234 void kgdb_port_init(void); 235 236 static int 237 bootstrap_bs_map(void *t, bus_addr_t bpa, bus_size_t size, 238 int cacheable, bus_space_handle_t * bshp); 239 static void copy_io_area_map(pd_entry_t * new_pd); 240 241 /* A load of console goo. */ 242 #include "vga.h" 243 #if NVGA > 0 244 #include <dev/ic/mc6845reg.h> 245 #include <dev/ic/pcdisplayvar.h> 246 #include <dev/ic/vgareg.h> 247 #include <dev/ic/vgavar.h> 248 #endif 249 250 #include "com.h" 251 #if NCOM > 0 252 #include <dev/ic/comreg.h> 253 #include <dev/ic/comvar.h> 254 #endif 255 256 #include "sscom.h" 257 #if NSSCOM > 0 258 #include "opt_sscom.h" 259 #include <arm/s3c2xx0/sscom_var.h> 260 #endif 261 262 /* 263 * Define the default console speed for the board. This is generally 264 * what the firmware provided with the board defaults to. 265 */ 266 #ifndef CONSPEED 267 #define CONSPEED B115200 /* TTYDEF_SPEED */ 268 #endif 269 #ifndef CONMODE 270 #define CONMODE ((TTYDEF_CFLAG & ~(CSIZE | CSTOPB | PARENB)) | CS8) /* 8N1 */ 271 #endif 272 273 int comcnspeed = CONSPEED; 274 int comcnmode = CONMODE; 275 276 struct bus_space bootstrap_bs_tag; 277 278 /* 279 * void cpu_reboot(int howto, char *bootstr) 280 * 281 * Reboots the system 282 * 283 * Deal with any syncing, unmounting, dumping and shutdown hooks, 284 * then reset the CPU. 285 */ 286 void 287 cpu_reboot(int howto, char *bootstr) 288 { 289 #ifdef DIAGNOSTIC 290 /* info */ 291 printf("boot: howto=%08x curproc=%p\n", howto, curproc); 292 #endif 293 294 cpu_reset_address = (u_int)s3c2800_softreset; 295 296 /* 297 * If we are still cold then hit the air brakes 298 * and crash to earth fast 299 */ 300 if (cold) { 301 doshutdownhooks(); 302 printf("The operating system has halted.\n"); 303 printf("Please press any key to reboot.\n\n"); 304 cngetc(); 305 printf("rebooting...\n"); 306 cpu_reset(); 307 /* NOTREACHED */ 308 } 309 /* Disable console buffering */ 310 311 /* 312 * If RB_NOSYNC was not specified sync the discs. 313 * Note: Unless cold is set to 1 here, syslogd will die during the 314 * unmount. It looks like syslogd is getting woken up only to find 315 * that it cannot page part of the binary in as the filesystem has 316 * been unmounted. 317 */ 318 if (!(howto & RB_NOSYNC)) 319 bootsync(); 320 321 /* Say NO to interrupts */ 322 splhigh(); 323 324 /* Do a dump if requested. */ 325 if ((howto & (RB_DUMP | RB_HALT)) == RB_DUMP) 326 dumpsys(); 327 328 /* Run any shutdown hooks */ 329 doshutdownhooks(); 330 331 /* Make sure IRQ's are disabled */ 332 IRQdisable; 333 334 if (howto & RB_HALT) { 335 printf("The operating system has halted.\n"); 336 printf("Please press any key to reboot.\n\n"); 337 cngetc(); 338 } 339 printf("rebooting...\n"); 340 cpu_reset(); 341 /* NOTREACHED */ 342 } 343 #define ioreg_write8(a,v) (*(volatile uint8_t *)(a)=(v)) 344 345 /* 346 * u_int initarm(...) 347 * 348 * Initial entry point on startup. This gets called before main() is 349 * entered. 350 * It should be responsible for setting up everything that must be 351 * in place when main is called. 352 * This includes 353 * Taking a copy of the boot configuration structure. 354 * Initialising the physical console so characters can be printed. 355 * Setting up page tables for the kernel 356 * Relocating the kernel to the bottom of physical memory 357 */ 358 359 u_int 360 initarm(void *arg) 361 { 362 int loop; 363 int loop1; 364 u_int l1pagetable; 365 extern int etext asm("_etext"); 366 extern int end asm("_end"); 367 pv_addr_t kernel_l1pt; 368 pv_addr_t kernel_ptpt; 369 struct s3c2xx0_softc temp_softc; /* used to initialize IO regs */ 370 int progress_counter = 0; 371 #ifdef MEMORY_DISK_DYNAMIC 372 void *md_root_start, *md_root_rom; 373 #endif 374 375 #define LEDSTEP() __LED(progress_counter++) 376 377 #define pdatc (*(volatile uint8_t *)(S3C2800_GPIO_BASE+GPIO_PDATC)) 378 #define __LED(x) (pdatc = (pdatc & ~0x07) | (~(x) & 0x07)) 379 380 LEDSTEP(); 381 /* 382 * Heads up ... Setup the CPU / MMU / TLB functions 383 */ 384 if (set_cpufuncs()) 385 panic("cpu not recognized!"); 386 387 LEDSTEP(); 388 /* 389 * prepare fake bus space tag 390 */ 391 bootstrap_bs_tag = s3c2xx0_bs_tag; 392 bootstrap_bs_tag.bs_map = bootstrap_bs_map; 393 temp_softc.sc_iot = &bootstrap_bs_tag; 394 s3c2xx0_softc = &temp_softc; 395 396 397 bootstrap_bs_map(&bootstrap_bs_tag, S3C2800_GPIO_BASE, 398 S3C2800_GPIO_SIZE, 0, &temp_softc.sc_gpio_ioh); 399 bootstrap_bs_map(&bootstrap_bs_tag, S3C2800_INTCTL_BASE, 400 S3C2800_INTCTL_SIZE, 0, &temp_softc.sc_intctl_ioh); 401 402 #undef __LED 403 #define __LED(x) bus_space_write_1( &bootstrap_bs_tag, temp_softc.sc_gpio_ioh, \ 404 GPIO_PDATC, (~(x) & 0x07) | \ 405 (bus_space_read_1( &bootstrap_bs_tag, \ 406 temp_softc.sc_gpio_ioh, GPIO_PDATC ) & ~0x07) ) 407 408 LEDSTEP(); 409 410 /* Disable all peripheral interrupts */ 411 bus_space_write_4(&bootstrap_bs_tag, temp_softc.sc_intctl_ioh, 412 INTCTL_INTMSK, 0); 413 414 consinit(); 415 printf("consinit done\n"); 416 417 #ifdef KGDB 418 LEDSTEP(); 419 kgdb_port_init(); 420 #endif 421 LEDSTEP(); 422 423 /* Talk to the user */ 424 printf("\nNetBSD/evbarm (SMDK2800) booting ...\n"); 425 426 /* 427 * Ok we have the following memory map 428 * 429 * Physical Address Range Description 430 * ----------------------- ---------------------------------- 431 * 0x00000000 - 0x00ffffff Intel flash Memory (16MB) 432 * 0x02000000 - 0x020fffff AMD flash Memory (1MB) 433 * or (depend on DIPSW setting) 434 * 0x00000000 - 0x000fffff AMD flash Memory (1MB) 435 * 0x02000000 - 0x02ffffff Intel flash Memory (16MB) 436 * 437 * 0x08000000 - 0x09ffffff SDRAM (32MB) 438 * 0x20000000 - 0x3fffffff PCI space 439 * 440 * The initarm() has the responsibility for creating the kernel 441 * page tables. 442 * It must also set up various memory pointers that are used 443 * by pmap etc. 444 */ 445 446 /* Fake bootconfig structure for the benefit of pmap.c */ 447 /* XXX must make the memory description h/w independent */ 448 bootconfig.dramblocks = 1; 449 bootconfig.dram[0].address = SDRAM_START; 450 bootconfig.dram[0].pages = SDRAM_SIZE / PAGE_SIZE; 451 452 /* 453 * Set up the variables that define the availablilty of 454 * physical memory. For now, we're going to set 455 * physical_freestart to 0x08200000 (where the kernel 456 * was loaded), and allocate the memory we need downwards. 457 * If we get too close to the bottom of SDRAM, we 458 * will panic. We will update physical_freestart and 459 * physical_freeend later to reflect what pmap_bootstrap() 460 * wants to see. 461 * 462 * XXX pmap_bootstrap() needs an enema. 463 */ 464 physical_start = bootconfig.dram[0].address; 465 physical_end = physical_start + (bootconfig.dram[0].pages * PAGE_SIZE); 466 #ifdef MEMORY_DISK_DYNAMIC 467 /* Reserve for ram disk */ 468 printf("Reserve %d bytes for memory disk\n", MD_ROOT_SIZE * L1_S_SIZE); 469 physical_end -= MD_ROOT_SIZE * L1_S_SIZE; 470 #endif 471 472 physical_freestart = 0x08000000UL; /* XXX */ 473 physical_freeend = 0x08200000UL; 474 475 physmem = (physical_end - physical_start) / PAGE_SIZE; 476 477 /* Tell the user about the memory */ 478 printf("physmemory: %d pages at 0x%08lx -> 0x%08lx\n", physmem, 479 physical_start, physical_end - 1); 480 481 /* 482 * XXX 483 * Okay, the kernel starts 2MB in from the bottom of physical 484 * memory. We are going to allocate our bootstrap pages downwards 485 * from there. 486 * 487 * We need to allocate some fixed page tables to get the kernel 488 * going. We allocate one page directory and a number of page 489 * tables and store the physical addresses in the kernel_pt_table 490 * array. 491 * 492 * The kernel page directory must be on a 16K boundary. The page 493 * tables must be on 4K bounaries. What we do is allocate the 494 * page directory on the first 16K boundary that we encounter, and 495 * the page tables on 4K boundaries otherwise. Since we allocate 496 * at least 3 L2 page tables, we are guaranteed to encounter at 497 * least one 16K aligned region. 498 */ 499 500 #ifdef VERBOSE_INIT_ARM 501 printf("Allocating page tables\n"); 502 #endif 503 504 free_pages = (physical_freeend - physical_freestart) / PAGE_SIZE; 505 506 #ifdef VERBOSE_INIT_ARM 507 printf("freestart = 0x%08lx, free_pages = %d (0x%08x)\n", 508 physical_freestart, free_pages, free_pages); 509 #endif 510 511 /* Define a macro to simplify memory allocation */ 512 #define valloc_pages(var, np) \ 513 alloc_pages((var).pv_pa, (np)); \ 514 (var).pv_va = KERNEL_BASE + (var).pv_pa - physical_start; 515 516 #define alloc_pages(var, np) \ 517 physical_freeend -= ((np) * PAGE_SIZE); \ 518 if (physical_freeend < physical_freestart) \ 519 panic("initarm: out of memory"); \ 520 (var) = physical_freeend; \ 521 free_pages -= (np); \ 522 memset((char *)(var), 0, ((np) * PAGE_SIZE)); 523 524 loop1 = 0; 525 kernel_l1pt.pv_pa = 0; 526 for (loop = 0; loop <= NUM_KERNEL_PTS; ++loop) { 527 /* Are we 16KB aligned for an L1 ? */ 528 if (((physical_freeend - L1_TABLE_SIZE) & (L1_TABLE_SIZE - 1)) == 0 529 && kernel_l1pt.pv_pa == 0) { 530 valloc_pages(kernel_l1pt, L1_TABLE_SIZE / PAGE_SIZE); 531 } else { 532 alloc_pages(kernel_pt_table[loop1].pv_pa, 533 L2_TABLE_SIZE / PAGE_SIZE); 534 kernel_pt_table[loop1].pv_va = 535 kernel_pt_table[loop1].pv_pa; 536 ++loop1; 537 } 538 } 539 540 /* This should never be able to happen but better confirm that. */ 541 if (!kernel_l1pt.pv_pa || (kernel_l1pt.pv_pa & (L1_TABLE_SIZE - 1)) != 0) 542 panic("initarm: Failed to align the kernel page directory\n"); 543 544 /* 545 * Allocate a page for the system page mapped to V0x00000000 546 * This page will just contain the system vectors and can be 547 * shared by all processes. 548 */ 549 alloc_pages(systempage.pv_pa, 1); 550 551 /* Allocate a page for the page table to map kernel page tables. */ 552 valloc_pages(kernel_ptpt, L2_TABLE_SIZE / PAGE_SIZE); 553 554 /* Allocate stacks for all modes */ 555 valloc_pages(irqstack, IRQ_STACK_SIZE); 556 valloc_pages(abtstack, ABT_STACK_SIZE); 557 valloc_pages(undstack, UND_STACK_SIZE); 558 valloc_pages(kernelstack, UPAGES); 559 560 #ifdef VERBOSE_INIT_ARM 561 printf("IRQ stack: p0x%08lx v0x%08lx\n", irqstack.pv_pa, 562 irqstack.pv_va); 563 printf("ABT stack: p0x%08lx v0x%08lx\n", abtstack.pv_pa, 564 abtstack.pv_va); 565 printf("UND stack: p0x%08lx v0x%08lx\n", undstack.pv_pa, 566 undstack.pv_va); 567 printf("SVC stack: p0x%08lx v0x%08lx\n", kernelstack.pv_pa, 568 kernelstack.pv_va); 569 #endif 570 571 alloc_pages(msgbufphys, round_page(MSGBUFSIZE) / PAGE_SIZE); 572 573 LEDSTEP(); 574 575 /* 576 * Ok we have allocated physical pages for the primary kernel 577 * page tables 578 */ 579 580 #ifdef VERBOSE_INIT_ARM 581 printf("Creating L1 page table at 0x%08lx\n", kernel_l1pt.pv_pa); 582 #endif 583 584 /* 585 * Now we start construction of the L1 page table 586 * We start by mapping the L2 page tables into the L1. 587 * This means that we can replace L1 mappings later on if necessary 588 */ 589 l1pagetable = kernel_l1pt.pv_pa; 590 591 /* Map the L2 pages tables in the L1 page table */ 592 pmap_link_l2pt(l1pagetable, 0x00000000, 593 &kernel_pt_table[KERNEL_PT_SYS]); 594 for (loop = 0; loop < KERNEL_PT_KERNEL_NUM; loop++) 595 pmap_link_l2pt(l1pagetable, KERNEL_BASE + loop * 0x00400000, 596 &kernel_pt_table[KERNEL_PT_KERNEL + loop]); 597 for (loop = 0; loop < KERNEL_PT_VMDATA_NUM; loop++) 598 pmap_link_l2pt(l1pagetable, KERNEL_VM_BASE + loop * 0x00400000, 599 &kernel_pt_table[KERNEL_PT_VMDATA + loop]); 600 pmap_link_l2pt(l1pagetable, PTE_BASE, &kernel_ptpt); 601 602 /* update the top of the kernel VM */ 603 pmap_curmaxkvaddr = 604 KERNEL_VM_BASE + (KERNEL_PT_VMDATA_NUM * 0x00400000); 605 606 #ifdef VERBOSE_INIT_ARM 607 printf("Mapping kernel\n"); 608 #endif 609 610 /* Now we fill in the L2 pagetable for the kernel static code/data */ 611 { 612 size_t textsize = (uintptr_t) & etext - KERNEL_TEXT_BASE; 613 size_t totalsize = (uintptr_t) & end - KERNEL_TEXT_BASE; 614 u_int logical; 615 616 textsize = (textsize + PGOFSET) & ~PGOFSET; 617 totalsize = (totalsize + PGOFSET) & ~PGOFSET; 618 619 logical = 0x00200000; /* offset of kernel in RAM */ 620 621 logical += pmap_map_chunk(l1pagetable, KERNEL_BASE + logical, 622 physical_start + logical, textsize, 623 VM_PROT_READ | VM_PROT_WRITE, PTE_CACHE); 624 logical += pmap_map_chunk(l1pagetable, KERNEL_BASE + logical, 625 physical_start + logical, totalsize - textsize, 626 VM_PROT_READ | VM_PROT_WRITE, PTE_CACHE); 627 } 628 629 #ifdef VERBOSE_INIT_ARM 630 printf("Constructing L2 page tables\n"); 631 #endif 632 633 /* Map the stack pages */ 634 pmap_map_chunk(l1pagetable, irqstack.pv_va, irqstack.pv_pa, 635 IRQ_STACK_SIZE * PAGE_SIZE, VM_PROT_READ | VM_PROT_WRITE, 636 PTE_CACHE); 637 pmap_map_chunk(l1pagetable, abtstack.pv_va, abtstack.pv_pa, 638 ABT_STACK_SIZE * PAGE_SIZE, VM_PROT_READ | VM_PROT_WRITE, 639 PTE_CACHE); 640 pmap_map_chunk(l1pagetable, undstack.pv_va, undstack.pv_pa, 641 UND_STACK_SIZE * PAGE_SIZE, VM_PROT_READ | VM_PROT_WRITE, 642 PTE_CACHE); 643 pmap_map_chunk(l1pagetable, kernelstack.pv_va, kernelstack.pv_pa, 644 UPAGES * PAGE_SIZE, VM_PROT_READ | VM_PROT_WRITE, PTE_CACHE); 645 646 pmap_map_chunk(l1pagetable, kernel_l1pt.pv_va, kernel_l1pt.pv_pa, 647 L1_TABLE_SIZE, VM_PROT_READ | VM_PROT_WRITE, PTE_CACHE); 648 649 /* Map the page table that maps the kernel pages */ 650 pmap_map_entry(l1pagetable, kernel_ptpt.pv_va, kernel_ptpt.pv_pa, 651 VM_PROT_READ | VM_PROT_WRITE, PTE_NOCACHE); 652 653 /* 654 * Map entries in the page table used to map PTE's 655 * Basically every kernel page table gets mapped here 656 */ 657 /* The -2 is slightly bogus, it should be -log2(sizeof(pt_entry_t)) */ 658 for (loop = 0; loop < KERNEL_PT_KERNEL_NUM; loop++) { 659 pmap_map_entry(l1pagetable, 660 PTE_BASE + ((KERNEL_BASE + 661 (loop * 0x00400000)) >> (PGSHIFT - 2)), 662 kernel_pt_table[KERNEL_PT_KERNEL + loop].pv_pa, 663 VM_PROT_READ | VM_PROT_WRITE, PTE_CACHE); 664 } 665 pmap_map_entry(l1pagetable, 666 PTE_BASE + (PTE_BASE >> (PGSHIFT - 2)), 667 kernel_ptpt.pv_pa, VM_PROT_READ | VM_PROT_WRITE, PTE_NOCACHE); 668 pmap_map_entry(l1pagetable, 669 PTE_BASE + (0x00000000 >> (PGSHIFT - 2)), 670 kernel_pt_table[KERNEL_PT_SYS].pv_pa, 671 VM_PROT_READ | VM_PROT_WRITE, PTE_CACHE); 672 for (loop = 0; loop < KERNEL_PT_VMDATA_NUM; loop++) 673 pmap_map_entry(l1pagetable, 674 PTE_BASE + ((KERNEL_VM_BASE + 675 (loop * 0x00400000)) >> (PGSHIFT - 2)), 676 kernel_pt_table[KERNEL_PT_VMDATA + loop].pv_pa, 677 VM_PROT_READ | VM_PROT_WRITE, PTE_CACHE); 678 679 /* Map the vector page. */ 680 #if 1 681 /* MULTI-ICE requires that page 0 is NC/NB so that it can download the 682 * cache-clean code there. */ 683 pmap_map_entry(l1pagetable, vector_page, systempage.pv_pa, 684 VM_PROT_READ | VM_PROT_WRITE, PTE_NOCACHE); 685 #else 686 pmap_map_entry(l1pagetable, vector_page, systempage.pv_pa, 687 VM_PROT_READ | VM_PROT_WRITE, PTE_CACHE); 688 #endif 689 690 #if 0 691 /* Map the core memory needed before autoconfig */ 692 loop = 0; 693 while (l1_sec_table[loop].size) { 694 vm_size_t sz; 695 696 #ifdef VERBOSE_INIT_ARM 697 printf("%08lx -> %08lx @ %08lx\n", l1_sec_table[loop].pa, 698 l1_sec_table[loop].pa + l1_sec_table[loop].size - 1, 699 l1_sec_table[loop].va); 700 #endif 701 for (sz = 0; sz < l1_sec_table[loop].size; sz += L1_S_SIZE) 702 pmap_map_section(l1pagetable, 703 l1_sec_table[loop].va + sz, 704 l1_sec_table[loop].pa + sz, 705 l1_sec_table[loop].prot, 706 l1_sec_table[loop].cache); 707 ++loop; 708 } 709 #endif 710 711 #ifdef MEMORY_DISK_DYNAMIC 712 /* Map ram for MD root This will overwrite old page table */ 713 bootstrap_bs_map(&bootstrap_bs_tag, physical_end, 714 MD_ROOT_SIZE * L1_S_SIZE, 0, (bus_space_handle_t *) & md_root_start); 715 /* map MD root image on ROM */ 716 bootstrap_bs_map(&bootstrap_bs_tag, MD_ROOT_START, 717 MD_ROOT_SIZE * L1_S_SIZE, 0, (bus_space_handle_t *) & md_root_rom); 718 719 #endif 720 /* 721 * map integrated peripherals at same address in l1pagetable 722 * so that we can continue to use console. 723 */ 724 copy_io_area_map((pd_entry_t *)l1pagetable); 725 726 /* 727 * Now we have the real page tables in place so we can switch to them. 728 * Once this is done we will be running with the REAL kernel page 729 * tables. 730 */ 731 732 /* 733 * Update the physical_freestart/physical_freeend/free_pages 734 * variables. 735 */ 736 { 737 physical_freestart = physical_start + 738 (((((uintptr_t) & end) + PGOFSET) & ~PGOFSET) - 739 KERNEL_BASE); 740 physical_freeend = physical_end; 741 free_pages = 742 (physical_freeend - physical_freestart) / PAGE_SIZE; 743 } 744 745 /* Switch tables */ 746 #ifdef VERBOSE_INIT_ARM 747 printf("freestart = 0x%08lx, free_pages = %d (0x%x)\n", 748 physical_freestart, free_pages, free_pages); 749 printf("switching to new L1 page table @%#lx...", kernel_l1pt.pv_pa); 750 #endif 751 LEDSTEP(); 752 setttb(kernel_l1pt.pv_pa); 753 cpu_tlb_flushID(); 754 755 #ifdef VERBOSE_INIT_ARM 756 printf("done!\n"); 757 #endif 758 759 #ifdef MEMORY_DISK_DYNAMIC 760 memcpy(md_root_start, md_root_rom, MD_ROOT_SIZE * L1_S_SIZE); 761 md_root_setconf(md_root_start, MD_ROOT_SIZE * L1_S_SIZE); 762 #endif 763 764 #if 0 765 /* 766 * The IFPGA registers have just moved. 767 * Detach the diagnostic serial port and reattach at the new address. 768 */ 769 plcomcndetach(); 770 /* 771 * XXX this should only be done in main() but it useful to 772 * have output earlier ... 773 */ 774 consinit(); 775 #endif 776 777 LEDSTEP(); 778 #ifdef VERBOSE_INIT_ARM 779 printf("bootstrap done.\n"); 780 #endif 781 782 arm32_vector_init(ARM_VECTORS_LOW, ARM_VEC_ALL); 783 784 /* 785 * Pages were allocated during the secondary bootstrap for the 786 * stacks for different CPU modes. 787 * We must now set the r13 registers in the different CPU modes to 788 * point to these stacks. 789 * Since the ARM stacks use STMFD etc. we must set r13 to the top end 790 * of the stack memory. 791 */ 792 printf("init subsystems: stacks "); 793 794 set_stackptr(PSR_IRQ32_MODE, 795 irqstack.pv_va + IRQ_STACK_SIZE * PAGE_SIZE); 796 set_stackptr(PSR_ABT32_MODE, 797 abtstack.pv_va + ABT_STACK_SIZE * PAGE_SIZE); 798 set_stackptr(PSR_UND32_MODE, 799 undstack.pv_va + UND_STACK_SIZE * PAGE_SIZE); 800 801 LEDSTEP(); 802 803 /* 804 * Well we should set a data abort handler. 805 * Once things get going this will change as we will need a proper 806 * handler. 807 * Until then we will use a handler that just panics but tells us 808 * why. 809 * Initialisation of the vectors will just panic on a data abort. 810 * This just fills in a slighly better one. 811 */ 812 printf("vectors "); 813 data_abort_handler_address = (u_int)data_abort_handler; 814 prefetch_abort_handler_address = (u_int)prefetch_abort_handler; 815 undefined_handler_address = (u_int)undefinedinstruction_bounce; 816 817 /* Initialise the undefined instruction handlers */ 818 printf("undefined "); 819 undefined_init(); 820 821 LEDSTEP(); 822 823 /* Load memory into UVM. */ 824 printf("page "); 825 uvm_setpagesize(); /* initialize PAGE_SIZE-dependent variables */ 826 uvm_page_physload(atop(physical_freestart), atop(physical_freeend), 827 atop(physical_freestart), atop(physical_freeend), 828 VM_FREELIST_DEFAULT); 829 830 LEDSTEP(); 831 /* Boot strap pmap telling it where the kernel page table is */ 832 printf("pmap "); 833 pmap_bootstrap((pd_entry_t *)kernel_l1pt.pv_va, kernel_ptpt); 834 835 LEDSTEP(); 836 837 /* Setup the IRQ system */ 838 printf("irq "); 839 /* XXX irq_init(); */ 840 841 printf("done.\n"); 842 843 boothowto |= RB_SINGLE | RB_KDB | RB_ASKNAME; 844 845 #ifdef IPKDB 846 /* Initialise ipkdb */ 847 ipkdb_init(); 848 if (boothowto & RB_KDB) 849 ipkdb_connect(0); 850 #endif 851 852 #ifdef KGDB 853 if (boothowto & RB_KDB) { 854 kgdb_debug_init = 1; 855 kgdb_connect(1); 856 } 857 #endif 858 859 #ifdef DDB 860 db_machine_init(); 861 862 /* Firmware doesn't load symbols. */ 863 ddb_init(0, NULL, NULL); 864 865 if (boothowto & RB_KDB) 866 Debugger(); 867 #endif 868 869 /* We return the new stack pointer address */ 870 return (kernelstack.pv_va + USPACE_SVC_STACK_TOP); 871 } 872 #ifndef SSCOM_FREQ 873 /* our PCLK is 50MHz */ 874 #define SSCOM_FREQ 50000000 875 #endif 876 877 void 878 consinit(void) 879 { 880 static int consinit_done = 0; 881 bus_space_tag_t iot = s3c2xx0_softc->sc_iot; 882 883 if (consinit_done != 0) 884 return; 885 886 consinit_done = 1; 887 888 #if NSSCOM > 0 889 #ifdef SSCOM0CONSOLE 890 if (0 == s3c2800_sscom_cnattach(iot, 0, comcnspeed, 891 SSCOM_FREQ, comcnmode)) 892 return; 893 #endif 894 #ifdef SSCOM1CONSOLE 895 if (0 == s3c2800_sscom_cnattach(iot, 1, comcnspeed, 896 SSCOM_FREQ, comcnmode)) 897 return; 898 #endif 899 #endif /* NSSCOM */ 900 #if NCOM>0 && defined(CONCOMADDR) 901 if (comcnattach(&isa_io_bs_tag, CONCOMADDR, comcnspeed, 902 COM_FREQ, comcnmode)) 903 panic("can't init serial console @%x", CONCOMADDR); 904 return; 905 #endif 906 907 consinit_done = 0; 908 } 909 910 911 #ifdef KGDB 912 913 #if (NSSCOM > 0) 914 915 #ifdef KGDB_DEVNAME 916 const char kgdb_devname[] = KGDB_DEVNAME; 917 #else 918 const char kgdb_devname[] = ""; 919 #endif 920 921 #ifndef KGDB_DEVMODE 922 #define KGDB_DEVMODE ((TTYDEF_CFLAG & ~(CSIZE|CSTOPB|PARENB))|CS8) /* 8N1 */ 923 #endif 924 int kgdb_sscom_mode = KGDB_DEVMODE; 925 926 #endif /* NSSCOM */ 927 928 void 929 kgdb_port_init(void) 930 { 931 #if (NSSCOM > 0) 932 int unit = -1; 933 934 if (strcmp(kgdb_devname, "sscom0") == 0) 935 unit = 0; 936 else if (strcmp(kgdb_devname, "sscom1") == 0) 937 unit = 1; 938 939 if (unit >= 0) { 940 s3c2800_sscom_kgdb_attach(s3c2xx0_softc->sc_iot, 941 unit, kgdb_rate, SSCOM_FREQ, kgdb_sscom_mode); 942 } 943 #endif 944 } 945 #endif 946 947 static __inline 948 pd_entry_t * 949 read_ttb(void) 950 { 951 long ttb; 952 953 __asm __volatile("mrc p15, 0, %0, c2, c0, 0" : "=r"(ttb)); 954 955 956 return (pd_entry_t *)(ttb & ~((1 << 14) - 1)); 957 } 958 959 960 static __inline void 961 writeback_dcache_line(vaddr_t va) 962 { 963 /* writeback Dcache line */ 964 /* we can't use cpu_dcache_wb_range() here, because cpufuncs for ARM9 965 * assume write-through cache, and always flush Dcache instead of 966 * cleaning it. Since Boot loader maps page table with write-back 967 * cached, we really need to clean Dcache. */ 968 asm("mcr p15, 0, %0, c7, c10, 1" 969 : : "r"(va)); 970 } 971 972 static __inline void 973 clean_dcache_line(vaddr_t va) 974 { 975 /* writeback and invalidate Dcache line */ 976 asm("mcr p15, 0, %0, c7, c14, 1" 977 : : "r"(va)); 978 } 979 980 static vaddr_t section_free = SMDK2800_VBASE_FREE; 981 982 /* 983 * simple memory mapping function used in early bootstrap stage 984 * before pmap is initialized. 985 * This assumes only peripheral registers to map. they are mapped to 986 * fixed address with section mapping. 987 */ 988 static int 989 bootstrap_bs_map(void *t, bus_addr_t bpa, bus_size_t size, 990 int flag, bus_space_handle_t * bshp) 991 { 992 long offset, sec; 993 int modified = 0; 994 pd_entry_t *pagedir = read_ttb(); 995 /* This assumes PA==VA for page directory */ 996 997 if (S3C2800_PERIPHERALS <= bpa && bpa < S3C2800_PERIPHERALS + 0x200000) { 998 offset = bpa - S3C2800_PERIPHERALS; 999 if (offset < 0 || 2 * L1_S_SIZE < offset) 1000 panic("bootstrap_bs_map: can't map"); 1001 sec = (SMDK2800_IO_AREA_VBASE + offset) >> L1_S_SHIFT; 1002 1003 /* already mapped? */ 1004 if ((pagedir[sec] & L1_S_FRAME) != (bpa & L1_S_FRAME)) { 1005 pmap_map_section((vaddr_t)pagedir, sec << L1_S_SHIFT, 1006 bpa & L1_S_FRAME, 1007 VM_PROT_READ | VM_PROT_WRITE, 1008 PTE_NOCACHE); 1009 1010 writeback_dcache_line((vaddr_t)&pagedir[sec]); 1011 modified = 1; 1012 } 1013 *bshp = (bus_space_handle_t)(SMDK2800_IO_AREA_VBASE + offset); 1014 } else { 1015 vaddr_t va; 1016 bus_addr_t pa; 1017 int cacheable = flag & BUS_SPACE_MAP_CACHEABLE; 1018 1019 1020 size = (size + L1_S_OFFSET) & ~L1_S_OFFSET; 1021 pa = bpa & ~L1_S_OFFSET; 1022 offset = bpa - pa; 1023 1024 va = section_free; 1025 while (size) { 1026 pmap_map_section((vaddr_t)pagedir, va, 1027 pa, VM_PROT_READ | VM_PROT_WRITE, 1028 cacheable ? PTE_CACHE : PTE_NOCACHE); 1029 writeback_dcache_line((vaddr_t)& pagedir[va >> L1_S_SHIFT]); 1030 va += L1_S_SIZE; 1031 pa += L1_S_SIZE; 1032 size -= L1_S_SIZE; 1033 } 1034 1035 *bshp = (bus_space_handle_t)(section_free + offset); 1036 section_free = va; 1037 } 1038 1039 1040 if (modified) { 1041 1042 cpu_drain_writebuf(); 1043 cpu_tlb_flushD(); 1044 } 1045 return (0); 1046 } 1047 1048 static void 1049 copy_io_area_map(pd_entry_t * new_pd) 1050 { 1051 pd_entry_t *cur_pd = read_ttb(); 1052 vaddr_t sec; 1053 1054 for (sec = SMDK2800_IO_AREA_VBASE >> L1_S_SHIFT; 1055 sec < (section_free >> L1_S_SHIFT); ++sec) { 1056 new_pd[sec] = cur_pd[sec]; 1057 } 1058 } 1059
Indexes created Wed Oct 01 07:09:59 GMT 2025