gemini_machdep.c revision 1.4
1 /* $NetBSD: gemini_machdep.c,v 1.4 2008/11/01 07:58:33 cliff Exp $ */ 2 3 /* adapted from: 4 * NetBSD: sdp24xx_machdep.c,v 1.4 2008/08/27 11:03:10 matt Exp 5 */ 6 7 /* 8 * Machine dependent functions for kernel setup for TI OSK5912 board. 9 * Based on lubbock_machdep.c which in turn was based on iq80310_machhdep.c 10 * 11 * Copyright (c) 2002, 2003, 2005 Genetec Corporation. All rights reserved. 12 * Written by Hiroyuki Bessho for Genetec Corporation. 13 * 14 * Redistribution and use in source and binary forms, with or without 15 * modification, are permitted provided that the following conditions 16 * are met: 17 * 1. Redistributions of source code must retain the above copyright 18 * notice, this list of conditions and the following disclaimer. 19 * 2. Redistributions in binary form must reproduce the above copyright 20 * notice, this list of conditions and the following disclaimer in the 21 * documentation and/or other materials provided with the distribution. 22 * 3. The name of Genetec Corporation may not be used to endorse or 23 * promote products derived from this software without specific prior 24 * written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY GENETEC CORPORATION ``AS IS'' AND 27 * 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 GENETEC CORPORATION 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 * Copyright (c) 2001 Wasabi Systems, Inc. 39 * All rights reserved. 40 * 41 * Written by Jason R. Thorpe for Wasabi Systems, Inc. 42 * 43 * Redistribution and use in source and binary forms, with or without 44 * modification, are permitted provided that the following conditions 45 * are met: 46 * 1. Redistributions of source code must retain the above copyright 47 * notice, this list of conditions and the following disclaimer. 48 * 2. Redistributions in binary form must reproduce the above copyright 49 * notice, this list of conditions and the following disclaimer in the 50 * documentation and/or other materials provided with the distribution. 51 * 3. All advertising materials mentioning features or use of this software 52 * must display the following acknowledgement: 53 * This product includes software developed for the NetBSD Project by 54 * Wasabi Systems, Inc. 55 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 56 * or promote products derived from this software without specific prior 57 * written permission. 58 * 59 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 60 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 61 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 62 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 63 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 64 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 65 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 66 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 67 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 68 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 69 * POSSIBILITY OF SUCH DAMAGE. 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 * Copyright (c) 2007 Microsoft 104 * All rights reserved. 105 * 106 * Redistribution and use in source and binary forms, with or without 107 * modification, are permitted provided that the following conditions 108 * are met: 109 * 1. Redistributions of source code must retain the above copyright 110 * notice, this list of conditions and the following disclaimer. 111 * 2. Redistributions in binary form must reproduce the above copyright 112 * notice, this list of conditions and the following disclaimer in the 113 * documentation and/or other materials provided with the distribution. 114 * 3. All advertising materials mentioning features or use of this software 115 * must display the following acknowledgement: 116 * This product includes software developed by Microsoft 117 * 118 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 119 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 120 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 121 * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTERS BE LIABLE FOR ANY DIRECT, 122 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 123 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 124 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 125 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 126 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 127 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 128 * SUCH DAMAGE. 129 */ 130 131 #include <sys/cdefs.h> 132 __KERNEL_RCSID(0, "$NetBSD: gemini_machdep.c,v 1.4 2008/11/01 07:58:33 cliff Exp $"); 133 134 #include "opt_machdep.h" 135 #include "opt_ddb.h" 136 #include "opt_kgdb.h" 137 #include "opt_ipkdb.h" 138 #include "opt_md.h" 139 #include "opt_com.h" 140 #include "opt_gemini.h" 141 #include "geminiwdt.h" 142 #include "md.h" 143 144 #include <sys/param.h> 145 #include <sys/device.h> 146 #include <sys/systm.h> 147 #include <sys/kernel.h> 148 #include <sys/exec.h> 149 #include <sys/proc.h> 150 #include <sys/msgbuf.h> 151 #include <sys/reboot.h> 152 #include <sys/termios.h> 153 #include <sys/ksyms.h> 154 155 #include <uvm/uvm_extern.h> 156 157 #include <sys/conf.h> 158 #include <dev/cons.h> 159 #include <dev/md.h> 160 161 #include <machine/db_machdep.h> 162 #include <ddb/db_sym.h> 163 #include <ddb/db_extern.h> 164 #ifdef KGDB 165 #include <sys/kgdb.h> 166 #endif 167 168 #include <machine/bootconfig.h> 169 #include <machine/bus.h> 170 #include <machine/cpu.h> 171 #include <machine/frame.h> 172 #include <arm/armreg.h> 173 #include <arm/undefined.h> 174 175 #include <arm/arm32/machdep.h> 176 177 #include <arm/gemini/gemini_reg.h> 178 #include <arm/gemini/gemini_var.h> 179 #include <arm/gemini/gemini_wdtvar.h> 180 #include <arm/gemini/gemini_com.h> 181 182 #include <evbarm/gemini/gemini.h> 183 184 /* 185 * Address to call from cpu_reset() to reset the machine. 186 * This is machine architecture dependant as it varies depending 187 * on where the ROM appears when you turn the MMU off. 188 */ 189 190 u_int cpu_reset_address = 0; 191 192 /* Define various stack sizes in pages */ 193 #define IRQ_STACK_SIZE 1 194 #define FIQ_STACK_SIZE 1 195 #define ABT_STACK_SIZE 1 196 #ifdef IPKDB 197 #define UND_STACK_SIZE 2 198 #else 199 #define UND_STACK_SIZE 1 200 #endif 201 202 BootConfig bootconfig; /* Boot config storage */ 203 char *boot_args = NULL; 204 char *boot_file = NULL; 205 206 /* Physical address of the beginning of SDRAM. */ 207 paddr_t physical_start; 208 /* Physical address of the first byte after the end of SDRAM. */ 209 paddr_t physical_end; 210 /* Number of pages of memory. */ 211 int physmem = 0; 212 213 /* Same things, but for the free (unused by the kernel) memory. */ 214 static paddr_t physical_freestart, physical_freeend; 215 static u_int free_pages; 216 217 /* Physical and virtual addresses for some global pages */ 218 pv_addr_t fiqstack; 219 pv_addr_t irqstack; 220 pv_addr_t undstack; 221 pv_addr_t abtstack; 222 pv_addr_t kernelstack; /* stack for SVC mode */ 223 224 /* Physical address of the message buffer. */ 225 paddr_t msgbufphys; 226 227 extern u_int data_abort_handler_address; 228 extern u_int prefetch_abort_handler_address; 229 extern u_int undefined_handler_address; 230 extern char KERNEL_BASE_phys[]; 231 extern char KERNEL_BASE_virt[]; 232 extern char etext[], __data_start[], _edata[], __bss_start[], __bss_end__[]; 233 extern char _end[]; 234 235 #define KERNEL_PT_SYS 0 /* Page table for mapping proc0 zero page */ 236 #define KERNEL_PT_KERNEL 1 /* Page table for mapping kernel */ 237 #define KERNEL_PT_KERNEL_NUM 4 238 #define KERNEL_PT_VMDATA (KERNEL_PT_KERNEL+KERNEL_PT_KERNEL_NUM) 239 /* Page tables for mapping kernel VM */ 240 #define KERNEL_PT_VMDATA_NUM 4 /* start with 16MB of KVM */ 241 #define NUM_KERNEL_PTS (KERNEL_PT_VMDATA + KERNEL_PT_VMDATA_NUM) 242 243 pv_addr_t kernel_pt_table[NUM_KERNEL_PTS]; 244 245 extern struct user *proc0paddr; 246 247 /* 248 * Macros to translate between physical and virtual for a subset of the 249 * kernel address space. *Not* for general use. 250 */ 251 #define KERNEL_BASE_PHYS ((paddr_t)&KERNEL_BASE_phys) 252 253 #define KERN_VTOPHYS(va) \ 254 ((paddr_t)((vaddr_t)va - KERNEL_BASE + GEMINI_DRAM_BASE)) 255 #define KERN_PHYSTOV(pa) \ 256 ((vaddr_t)((paddr_t)pa - GEMINI_DRAM_BASE + KERNEL_BASE)) 257 258 /* Prototypes */ 259 260 void gemini_intr_init(bus_space_tag_t); 261 void consinit(void); 262 #ifdef KGDB 263 static void kgdb_port_init(void); 264 #endif 265 266 static void setup_real_page_tables(void); 267 static void init_clocks(void); 268 269 bs_protos(bs_notimpl); 270 271 #include "com.h" 272 #if NCOM > 0 273 #include <dev/ic/comreg.h> 274 #include <dev/ic/comvar.h> 275 #endif 276 277 278 static void gemini_global_reset(void) __attribute__ ((noreturn)); 279 280 static void 281 gemini_global_reset(void) 282 { 283 volatile uint32_t *rp; 284 uint32_t r; 285 286 rp = (volatile uint32_t *) 287 (GEMINI_GLOBAL_VBASE + GEMINI_GLOBAL_RESET_CTL); 288 r = *rp; 289 r |= GLOBAL_RESET_GLOBAL; 290 *rp = r; 291 for(;;); 292 /* NOTREACHED */ 293 } 294 295 /* 296 * void cpu_reboot(int howto, char *bootstr) 297 * 298 * Reboots the system 299 * 300 * Deal with any syncing, unmounting, dumping and shutdown hooks, 301 * then reset the CPU. 302 */ 303 void 304 cpu_reboot(int howto, char *bootstr) 305 { 306 #ifdef DIAGNOSTIC 307 /* info */ 308 printf("boot: howto=%08x curproc=%p\n", howto, curproc); 309 #endif 310 311 /* 312 * If we are still cold then hit the air brakes 313 * and crash to earth fast 314 */ 315 if (cold) { 316 doshutdownhooks(); 317 printf("The operating system has halted.\n"); 318 printf("Please press any key to reboot.\n\n"); 319 cngetc(); 320 printf("rebooting...\n"); 321 delay(2000); /* cnflush(); */ 322 gemini_global_reset(); 323 /*NOTREACHED*/ 324 } 325 326 /* Disable console buffering */ 327 /* cnpollc(1);*/ 328 329 /* 330 * If RB_NOSYNC was not specified sync the discs. 331 * Note: Unless cold is set to 1 here, syslogd will die during the 332 * unmount. It looks like syslogd is getting woken up only to find 333 * that it cannot page part of the binary in as the filesystem has 334 * been unmounted. 335 */ 336 if (!(howto & RB_NOSYNC)) 337 bootsync(); 338 339 /* Say NO to interrupts */ 340 splhigh(); 341 342 /* Do a dump if requested. */ 343 if ((howto & (RB_DUMP | RB_HALT)) == RB_DUMP) 344 dumpsys(); 345 346 /* Run any shutdown hooks */ 347 doshutdownhooks(); 348 349 /* Make sure IRQ's are disabled */ 350 IRQdisable; 351 352 if (howto & RB_HALT) { 353 printf("The operating system has halted.\n"); 354 printf("Please press any key to reboot.\n\n"); 355 cngetc(); 356 } 357 358 printf("rebooting...\n"); 359 delay(2000); /* cnflush(); */ 360 gemini_global_reset(); 361 /*NOTREACHED*/ 362 } 363 364 /* 365 * Static device mappings. These peripheral registers are mapped at 366 * fixed virtual addresses very early in initarm() so that we can use 367 * them while booting the kernel, and stay at the same address 368 * throughout whole kernel's life time. 369 * 370 * We use this table twice; once with bootstrap page table, and once 371 * with kernel's page table which we build up in initarm(). 372 * 373 * Since we map these registers into the bootstrap page table using 374 * pmap_devmap_bootstrap() which calls pmap_map_chunk(), we map 375 * registers segment-aligned and segment-rounded in order to avoid 376 * using the 2nd page tables. 377 */ 378 379 #define _A(a) ((a) & ~L1_S_OFFSET) 380 #define _S(s) (((s) + L1_S_SIZE - 1) & ~(L1_S_SIZE-1)) 381 382 static const struct pmap_devmap devmap[] = { 383 /* Global regs */ 384 { 385 .pd_va = _A(GEMINI_GLOBAL_VBASE), 386 .pd_pa = _A(GEMINI_GLOBAL_BASE), 387 .pd_size = _S(L1_S_SIZE), 388 .pd_prot = VM_PROT_READ|VM_PROT_WRITE, 389 .pd_cache = PTE_NOCACHE 390 }, 391 392 /* Watchdog */ 393 { 394 .pd_va = _A(GEMINI_WATCHDOG_VBASE), 395 .pd_pa = _A(GEMINI_WATCHDOG_BASE), 396 .pd_size = _S(L1_S_SIZE), 397 .pd_prot = VM_PROT_READ|VM_PROT_WRITE, 398 .pd_cache = PTE_NOCACHE 399 }, 400 401 /* UART */ 402 { 403 .pd_va = _A(GEMINI_CONSOLE_VBASE), 404 .pd_pa = _A(CONSADDR), 405 .pd_size = _S(L1_S_SIZE), 406 .pd_prot = VM_PROT_READ|VM_PROT_WRITE, 407 .pd_cache = PTE_NOCACHE 408 }, 409 410 /* Timers */ 411 { 412 .pd_va = _A(GEMINI_TIMER_VBASE), 413 .pd_pa = _A(GEMINI_TIMER_BASE), 414 .pd_size = _S(L1_S_SIZE), 415 .pd_prot = VM_PROT_READ|VM_PROT_WRITE, 416 .pd_cache = PTE_NOCACHE 417 }, 418 419 {0} /* list terminator */ 420 }; 421 422 #undef _A 423 #undef _S 424 425 #ifdef DDB 426 static void gemini_db_trap(int where) 427 { 428 #if NGEMINIWDT > 0 429 static int oldwatchdogstate; 430 431 if (where) { 432 oldwatchdogstate = geminiwdt_enable(0); 433 } else { 434 geminiwdt_enable(oldwatchdogstate); 435 } 436 #endif 437 } 438 #endif 439 440 void gemini_putchar(char c); 441 void 442 gemini_putchar(char c) 443 { 444 unsigned char *com0addr = (char *)GEMINI_CONSOLE_VBASE; 445 int timo = 150000; 446 447 while ((com0addr[COM_REG_LSR * 4] & LSR_TXRDY) == 0) 448 if (--timo == 0) 449 break; 450 451 com0addr[COM_REG_TXDATA] = c; 452 453 while ((com0addr[COM_REG_LSR * 4] & LSR_TSRE) == 0) 454 if (--timo == 0) 455 break; 456 } 457 458 void gemini_puthex(unsigned int); 459 void 460 gemini_puthex(unsigned int val) 461 { 462 char hexc[] = "0123456789abcdef"; 463 464 gemini_putchar('0'); 465 gemini_putchar('x'); 466 gemini_putchar(hexc[(val >> 28) & 0xf]); 467 gemini_putchar(hexc[(val >> 24) & 0xf]); 468 gemini_putchar(hexc[(val >> 20) & 0xf]); 469 gemini_putchar(hexc[(val >> 16) & 0xf]); 470 gemini_putchar(hexc[(val >> 12) & 0xf]); 471 gemini_putchar(hexc[(val >> 8) & 0xf]); 472 gemini_putchar(hexc[(val >> 4) & 0xf]); 473 gemini_putchar(hexc[(val >> 0) & 0xf]); 474 } 475 476 /* 477 * u_int initarm(...) 478 * 479 * Initial entry point on startup. This gets called before main() is 480 * entered. 481 * It should be responsible for setting up everything that must be 482 * in place when main is called. 483 * This includes 484 * Taking a copy of the boot configuration structure. 485 * Initialising the physical console so characters can be printed. 486 * Setting up page tables for the kernel 487 * Relocating the kernel to the bottom of physical memory 488 */ 489 u_int 490 initarm(void *arg) 491 { 492 gemini_putchar('0'); 493 494 /* 495 * When we enter here, we are using a temporary first level 496 * translation table with section entries in it to cover the OBIO 497 * peripherals and SDRAM. The temporary first level translation table 498 * is at the end of SDRAM. 499 */ 500 501 /* Heads up ... Setup the CPU / MMU / TLB functions. */ 502 gemini_putchar('1'); 503 if (set_cpufuncs()) 504 panic("cpu not recognized!"); 505 506 gemini_putchar('2'); 507 init_clocks(); 508 gemini_putchar('3'); 509 510 /* The console is going to try to map things. Give pmap a devmap. */ 511 pmap_devmap_register(devmap); 512 gemini_putchar('4'); 513 consinit(); 514 gemini_putchar('5'); 515 #ifdef KGDB 516 kgdb_port_init(); 517 #endif 518 519 #ifdef VERBOSE_INIT_ARM 520 /* Talk to the user */ 521 printf("\nNetBSD/evbarm (gemini) booting ...\n"); 522 #endif 523 524 #ifdef BOOT_ARGS 525 char mi_bootargs[] = BOOT_ARGS; 526 parse_mi_bootargs(mi_bootargs); 527 #endif 528 529 #ifdef VERBOSE_INIT_ARM 530 printf("initarm: Configuring system ...\n"); 531 #endif 532 533 /* 534 * Set up the variables that define the availability of physical 535 * memory. 536 */ 537 physical_start = GEMINI_DRAM_BASE; 538 #define MEMSIZE_BYTES (MEMSIZE * 1024 * 1024) 539 physical_end = (physical_start & ~(0x400000-1)) + MEMSIZE_BYTES; 540 physmem = (physical_end - physical_start) / PAGE_SIZE; 541 542 /* Fake bootconfig structure for the benefit of pmap.c. */ 543 bootconfig.dramblocks = 1; 544 bootconfig.dram[0].address = physical_start; 545 bootconfig.dram[0].pages = physmem; 546 547 /* 548 * Our kernel is at the beginning of memory, so set our free space to 549 * all the memory after the kernel. 550 */ 551 physical_freestart = KERN_VTOPHYS(round_page((vaddr_t) _end)); 552 physical_freeend = physical_end; 553 free_pages = (physical_freeend - physical_freestart) / PAGE_SIZE; 554 555 /* 556 * This is going to do all the hard work of setting up the first and 557 * and second level page tables. Pages of memory will be allocated 558 * and mapped for other structures that are required for system 559 * operation. When it returns, physical_freestart and free_pages will 560 * have been updated to reflect the allocations that were made. In 561 * addition, kernel_l1pt, kernel_pt_table[], systempage, irqstack, 562 * abtstack, undstack, kernelstack, msgbufphys will be set to point to 563 * the memory that was allocated for them. 564 */ 565 setup_real_page_tables(); 566 567 /* 568 * Moved from cpu_startup() as data_abort_handler() references 569 * this during uvm init. 570 */ 571 proc0paddr = (struct user *)kernelstack.pv_va; 572 lwp0.l_addr = proc0paddr; 573 574 #ifdef VERBOSE_INIT_ARM 575 printf("bootstrap done.\n"); 576 #endif 577 578 arm32_vector_init(ARM_VECTORS_HIGH, ARM_VEC_ALL); 579 580 /* 581 * Pages were allocated during the secondary bootstrap for the 582 * stacks for different CPU modes. 583 * We must now set the r13 registers in the different CPU modes to 584 * point to these stacks. 585 * Since the ARM stacks use STMFD etc. we must set r13 to the top end 586 * of the stack memory. 587 */ 588 #ifdef VERBOSE_INIT_ARM 589 printf("init subsystems: stacks "); 590 #endif 591 592 set_stackptr(PSR_FIQ32_MODE, fiqstack.pv_va + FIQ_STACK_SIZE * PAGE_SIZE); 593 set_stackptr(PSR_IRQ32_MODE, irqstack.pv_va + IRQ_STACK_SIZE * PAGE_SIZE); 594 set_stackptr(PSR_ABT32_MODE, abtstack.pv_va + ABT_STACK_SIZE * PAGE_SIZE); 595 set_stackptr(PSR_UND32_MODE, undstack.pv_va + UND_STACK_SIZE * PAGE_SIZE); 596 597 /* 598 * Well we should set a data abort handler. 599 * Once things get going this will change as we will need a proper 600 * handler. 601 * Until then we will use a handler that just panics but tells us 602 * why. 603 * Initialisation of the vectors will just panic on a data abort. 604 * This just fills in a slightly better one. 605 */ 606 #ifdef VERBOSE_INIT_ARM 607 printf("vectors "); 608 #endif 609 data_abort_handler_address = (u_int)data_abort_handler; 610 prefetch_abort_handler_address = (u_int)prefetch_abort_handler; 611 undefined_handler_address = (u_int)undefinedinstruction_bounce; 612 613 /* Initialise the undefined instruction handlers */ 614 #ifdef VERBOSE_INIT_ARM 615 printf("undefined "); 616 #endif 617 undefined_init(); 618 619 /* Load memory into UVM. */ 620 #ifdef VERBOSE_INIT_ARM 621 printf("page "); 622 #endif 623 uvm_setpagesize(); /* initialize PAGE_SIZE-dependent variables */ 624 uvm_page_physload(atop(physical_freestart), atop(physical_freeend), 625 atop(physical_freestart), atop(physical_freeend), 626 VM_FREELIST_DEFAULT); 627 uvm_page_physload(atop(GEMINI_DRAM_BASE), atop(KERNEL_BASE_phys), 628 atop(GEMINI_DRAM_BASE), atop(KERNEL_BASE_phys), 629 VM_FREELIST_DEFAULT); 630 631 /* Boot strap pmap telling it where the kernel page table is */ 632 #ifdef VERBOSE_INIT_ARM 633 printf("pmap "); 634 #endif 635 pmap_bootstrap(KERNEL_VM_BASE, KERNEL_VM_BASE + KERNEL_VM_SIZE); 636 637 #ifdef VERBOSE_INIT_ARM 638 printf("done.\n"); 639 #endif 640 641 #ifdef IPKDB 642 /* Initialise ipkdb */ 643 ipkdb_init(); 644 if (boothowto & RB_KDB) 645 ipkdb_connect(0); 646 #endif 647 648 #ifdef KGDB 649 if (boothowto & RB_KDB) { 650 kgdb_debug_init = 1; 651 kgdb_connect(1); 652 } 653 #endif 654 655 #ifdef DDB 656 db_trap_callback = gemini_db_trap; 657 db_machine_init(); 658 659 /* Firmware doesn't load symbols. */ 660 ddb_init(0, NULL, NULL); 661 662 if (boothowto & RB_KDB) 663 Debugger(); 664 #endif 665 printf("initarm done.\n"); 666 667 /* We return the new stack pointer address */ 668 return(kernelstack.pv_va + USPACE_SVC_STACK_TOP); 669 } 670 671 static void 672 init_clocks(void) 673 { 674 } 675 676 #ifndef CONSADDR 677 #error Specify the address of the console UART with the CONSADDR option. 678 #endif 679 #ifndef CONSPEED 680 #define CONSPEED 19200 681 #endif 682 #ifndef CONMODE 683 #define CONMODE ((TTYDEF_CFLAG & ~(CSIZE | CSTOPB | PARENB)) | CS8) /* 8N1 */ 684 #endif 685 686 static const bus_addr_t consaddr = CONSADDR; 687 static const int conspeed = CONSPEED; 688 static const int conmode = CONMODE; 689 690 void 691 consinit(void) 692 { 693 bus_space_handle_t bh; 694 static int consinit_called = 0; 695 696 if (consinit_called != 0) 697 return; 698 consinit_called = 1; 699 700 if (bus_space_map(&gemini_a4x_bs_tag, consaddr, 701 GEMINI_UART_SIZE, 0, &bh)) 702 panic("Serial console can not be mapped."); 703 704 if (comcnattach(&gemini_a4x_bs_tag, consaddr, conspeed, 705 GEMINI_COM_FREQ, COM_TYPE_16550_NOERS, conmode)) 706 panic("Serial console can not be initialized."); 707 708 bus_space_unmap(&gemini_a4x_bs_tag, bh, GEMINI_UART_SIZE); 709 } 710 711 #ifdef KGDB 712 #ifndef KGDB_DEVADDR 713 #error Specify the address of the kgdb UART with the KGDB_DEVADDR option. 714 #endif 715 #ifndef KGDB_DEVRATE 716 #define KGDB_DEVRATE 19200 717 #endif 718 719 #ifndef KGDB_DEVMODE 720 #define KGDB_DEVMODE ((TTYDEF_CFLAG & ~(CSIZE | CSTOPB | PARENB)) | CS8) /* 8N1 */ 721 #endif 722 static const vaddr_t comkgdbaddr = KGDB_DEVADDR; 723 static const int comkgdbspeed = KGDB_DEVRATE; 724 static const int comkgdbmode = KGDB_DEVMODE; 725 726 void 727 static kgdb_port_init(void) 728 { 729 static int kgdbsinit_called = 0; 730 731 if (kgdbsinit_called != 0) 732 return; 733 734 kgdbsinit_called = 1; 735 736 bus_space_handle_t bh; 737 if (bus_space_map(&gemini_a4x_bs_tag, comkgdbaddr, 738 GEMINI_UART_SIZE, 0, &bh)) 739 panic("kgdb port can not be mapped."); 740 741 if (com_kgdb_attach(&gemini_a4x_bs_tag, comkgdbaddr, comkgdbspeed, 742 GEMINI_UART_SIZE, COM_TYPE_16550_NOERS, comkgdbmode)) 743 panic("KGDB uart can not be initialized."); 744 745 bus_space_unmap(&gemini_a4x_bs_tag, bh, GEMINI_UART_SIZE); 746 } 747 #endif 748 749 static void 750 setup_real_page_tables(void) 751 { 752 /* 753 * We need to allocate some fixed page tables to get the kernel going. 754 * 755 * We are going to allocate our bootstrap pages from the beginning of 756 * the free space that we just calculated. We allocate one page 757 * directory and a number of page tables and store the physical 758 * addresses in the kernel_pt_table array. 759 * 760 * The kernel page directory must be on a 16K boundary. The page 761 * tables must be on 4K boundaries. What we do is allocate the 762 * page directory on the first 16K boundary that we encounter, and 763 * the page tables on 4K boundaries otherwise. Since we allocate 764 * at least 3 L2 page tables, we are guaranteed to encounter at 765 * least one 16K aligned region. 766 */ 767 768 #ifdef VERBOSE_INIT_ARM 769 printf("Allocating page tables\n"); 770 #endif 771 772 /* 773 * Define a macro to simplify memory allocation. As we allocate the 774 * memory, make sure that we don't walk over our temporary first level 775 * translation table. 776 */ 777 #define valloc_pages(var, np) \ 778 (var).pv_pa = physical_freestart; \ 779 physical_freestart += ((np) * PAGE_SIZE); \ 780 if (physical_freestart > (physical_freeend - L1_TABLE_SIZE)) \ 781 panic("initarm: out of memory"); \ 782 free_pages -= (np); \ 783 (var).pv_va = KERN_PHYSTOV((var).pv_pa); \ 784 memset((char *)(var).pv_va, 0, ((np) * PAGE_SIZE)); 785 786 int loop, pt_index; 787 788 pt_index = 0; 789 kernel_l1pt.pv_pa = 0; 790 kernel_l1pt.pv_va = 0; 791 printf("%s: physical_freestart %#lx\n", __func__, physical_freestart); 792 for (loop = 0; loop <= NUM_KERNEL_PTS; ++loop) { 793 /* Are we 16KB aligned for an L1 ? */ 794 if ((physical_freestart & (L1_TABLE_SIZE - 1)) == 0 795 && kernel_l1pt.pv_pa == 0) { 796 valloc_pages(kernel_l1pt, L1_TABLE_SIZE / PAGE_SIZE); 797 } else { 798 valloc_pages(kernel_pt_table[pt_index], 799 L2_TABLE_SIZE / PAGE_SIZE); 800 ++pt_index; 801 } 802 } 803 pt_index=0; 804 printf("%s: kernel_l1pt: %#lx:%#lx\n", __func__, kernel_l1pt.pv_va, kernel_l1pt.pv_pa); 805 printf("%s: kernel_pt_table:\n", __func__); 806 for (loop = 0; loop < NUM_KERNEL_PTS; ++loop) { 807 printf("\t%#lx:%#lx\n", kernel_pt_table[pt_index].pv_va, kernel_pt_table[pt_index].pv_pa); 808 ++pt_index; 809 } 810 811 /* This should never be able to happen but better confirm that. */ 812 if (!kernel_l1pt.pv_pa || (kernel_l1pt.pv_pa & (L1_TABLE_SIZE-1)) != 0) 813 panic("initarm: Failed to align the kernel page directory"); 814 815 /* 816 * Allocate a page for the system page mapped to V0x00000000 817 * This page will just contain the system vectors and can be 818 * shared by all processes. 819 */ 820 valloc_pages(systempage, 1); 821 systempage.pv_va = ARM_VECTORS_HIGH; 822 823 /* Allocate stacks for all modes */ 824 valloc_pages(fiqstack, FIQ_STACK_SIZE); 825 valloc_pages(irqstack, IRQ_STACK_SIZE); 826 valloc_pages(abtstack, ABT_STACK_SIZE); 827 valloc_pages(undstack, UND_STACK_SIZE); 828 valloc_pages(kernelstack, UPAGES); 829 830 /* Allocate the message buffer. */ 831 pv_addr_t msgbuf; 832 int msgbuf_pgs = round_page(MSGBUFSIZE) / PAGE_SIZE; 833 valloc_pages(msgbuf, msgbuf_pgs); 834 msgbufphys = msgbuf.pv_pa; 835 836 /* 837 * Ok we have allocated physical pages for the primary kernel 838 * page tables 839 */ 840 841 #ifdef VERBOSE_INIT_ARM 842 printf("Creating L1 page table at 0x%08lx\n", kernel_l1pt.pv_pa); 843 #endif 844 845 /* 846 * Now we start construction of the L1 page table 847 * We start by mapping the L2 page tables into the L1. 848 * This means that we can replace L1 mappings later on if necessary 849 */ 850 vaddr_t l1_va = kernel_l1pt.pv_va; 851 paddr_t l1_pa = kernel_l1pt.pv_pa; 852 853 /* Map the L2 pages tables in the L1 page table */ 854 pmap_link_l2pt(l1_va, ARM_VECTORS_HIGH & ~(0x00400000 - 1), 855 &kernel_pt_table[KERNEL_PT_SYS]); 856 for (loop = 0; loop < KERNEL_PT_KERNEL_NUM; loop++) 857 pmap_link_l2pt(l1_va, KERNEL_BASE + loop * 0x00400000, 858 &kernel_pt_table[KERNEL_PT_KERNEL + loop]); 859 for (loop = 0; loop < KERNEL_PT_VMDATA_NUM; loop++) 860 pmap_link_l2pt(l1_va, KERNEL_VM_BASE + loop * 0x00400000, 861 &kernel_pt_table[KERNEL_PT_VMDATA + loop]); 862 863 /* update the top of the kernel VM */ 864 pmap_curmaxkvaddr = 865 KERNEL_VM_BASE + (KERNEL_PT_VMDATA_NUM * 0x00400000); 866 867 #ifdef VERBOSE_INIT_ARM 868 printf("Mapping kernel\n"); 869 #endif 870 871 /* Now we fill in the L2 pagetable for the kernel static code/data */ 872 #define round_L_page(x) (((x) + L2_L_OFFSET) & L2_L_FRAME) 873 size_t textsize = round_L_page(etext - KERNEL_BASE_virt); 874 size_t totalsize = round_L_page(_end - KERNEL_BASE_virt); 875 /* offset of kernel in RAM */ 876 u_int offset = (u_int)KERNEL_BASE_virt - KERNEL_BASE; 877 878 /* Map text section read-only. */ 879 offset += pmap_map_chunk(l1_va, 880 (vaddr_t)KERNEL_BASE + offset, 881 physical_start + offset, textsize, 882 VM_PROT_READ|VM_PROT_EXECUTE, PTE_CACHE); 883 /* Map data and bss sections read-write. */ 884 offset += pmap_map_chunk(l1_va, 885 (vaddr_t)KERNEL_BASE + offset, 886 physical_start + offset, totalsize - textsize, 887 VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE); 888 889 #ifdef VERBOSE_INIT_ARM 890 printf("Constructing L2 page tables\n"); 891 #endif 892 893 /* Map the stack pages */ 894 pmap_map_chunk(l1_va, fiqstack.pv_va, fiqstack.pv_pa, 895 FIQ_STACK_SIZE * PAGE_SIZE, VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE); 896 pmap_map_chunk(l1_va, irqstack.pv_va, irqstack.pv_pa, 897 IRQ_STACK_SIZE * PAGE_SIZE, VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE); 898 pmap_map_chunk(l1_va, abtstack.pv_va, abtstack.pv_pa, 899 ABT_STACK_SIZE * PAGE_SIZE, VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE); 900 pmap_map_chunk(l1_va, undstack.pv_va, undstack.pv_pa, 901 UND_STACK_SIZE * PAGE_SIZE, VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE); 902 pmap_map_chunk(l1_va, kernelstack.pv_va, kernelstack.pv_pa, 903 UPAGES * PAGE_SIZE, VM_PROT_READ | VM_PROT_WRITE, PTE_CACHE); 904 905 pmap_map_chunk(l1_va, kernel_l1pt.pv_va, kernel_l1pt.pv_pa, 906 L1_TABLE_SIZE, VM_PROT_READ | VM_PROT_WRITE, PTE_PAGETABLE); 907 908 for (loop = 0; loop < NUM_KERNEL_PTS; ++loop) { 909 pmap_map_chunk(l1_va, kernel_pt_table[loop].pv_va, 910 kernel_pt_table[loop].pv_pa, L2_TABLE_SIZE, 911 VM_PROT_READ|VM_PROT_WRITE, PTE_PAGETABLE); 912 } 913 914 /* Map the vector page. */ 915 pmap_map_entry(l1_va, ARM_VECTORS_HIGH, systempage.pv_pa, 916 VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE); 917 918 /* 919 * Map integrated peripherals at same address in first level page 920 * table so that we can continue to use console. 921 */ 922 pmap_devmap_bootstrap(l1_va, devmap); 923 924 925 #ifdef VERBOSE_INIT_ARM 926 /* Tell the user about where all the bits and pieces live. */ 927 printf("%22s Physical Virtual Num\n", " "); 928 printf("%22s Starting Ending Starting Ending Pages\n", " "); 929 930 static const char mem_fmt[] = 931 "%20s: 0x%08lx 0x%08lx 0x%08lx 0x%08lx %d\n"; 932 static const char mem_fmt_nov[] = 933 "%20s: 0x%08lx 0x%08lx %d\n"; 934 935 printf(mem_fmt, "SDRAM", physical_start, physical_end-1, 936 KERN_PHYSTOV(physical_start), KERN_PHYSTOV(physical_end-1), 937 physmem); 938 printf(mem_fmt, "text section", 939 KERN_VTOPHYS(KERNEL_BASE_virt), KERN_VTOPHYS(etext-1), 940 (vaddr_t)KERNEL_BASE_virt, (vaddr_t)etext-1, 941 (int)(textsize / PAGE_SIZE)); 942 printf(mem_fmt, "data section", 943 KERN_VTOPHYS(__data_start), KERN_VTOPHYS(_edata), 944 (vaddr_t)__data_start, (vaddr_t)_edata, 945 (int)((round_page((vaddr_t)_edata) 946 - trunc_page((vaddr_t)__data_start)) / PAGE_SIZE)); 947 printf(mem_fmt, "bss section", 948 KERN_VTOPHYS(__bss_start), KERN_VTOPHYS(__bss_end__), 949 (vaddr_t)__bss_start, (vaddr_t)__bss_end__, 950 (int)((round_page((vaddr_t)__bss_end__) 951 - trunc_page((vaddr_t)__bss_start)) / PAGE_SIZE)); 952 printf(mem_fmt, "L1 page directory", 953 kernel_l1pt.pv_pa, kernel_l1pt.pv_pa + L1_TABLE_SIZE - 1, 954 kernel_l1pt.pv_va, kernel_l1pt.pv_va + L1_TABLE_SIZE - 1, 955 L1_TABLE_SIZE / PAGE_SIZE); 956 printf(mem_fmt, "Exception Vectors", 957 systempage.pv_pa, systempage.pv_pa + PAGE_SIZE - 1, 958 (vaddr_t)ARM_VECTORS_HIGH, (vaddr_t)ARM_VECTORS_HIGH + PAGE_SIZE - 1, 959 1); 960 printf(mem_fmt, "FIQ stack", 961 fiqstack.pv_pa, fiqstack.pv_pa + (FIQ_STACK_SIZE * PAGE_SIZE) - 1, 962 fiqstack.pv_va, fiqstack.pv_va + (FIQ_STACK_SIZE * PAGE_SIZE) - 1, 963 FIQ_STACK_SIZE); 964 printf(mem_fmt, "IRQ stack", 965 irqstack.pv_pa, irqstack.pv_pa + (IRQ_STACK_SIZE * PAGE_SIZE) - 1, 966 irqstack.pv_va, irqstack.pv_va + (IRQ_STACK_SIZE * PAGE_SIZE) - 1, 967 IRQ_STACK_SIZE); 968 printf(mem_fmt, "ABT stack", 969 abtstack.pv_pa, abtstack.pv_pa + (ABT_STACK_SIZE * PAGE_SIZE) - 1, 970 abtstack.pv_va, abtstack.pv_va + (ABT_STACK_SIZE * PAGE_SIZE) - 1, 971 ABT_STACK_SIZE); 972 printf(mem_fmt, "UND stack", 973 undstack.pv_pa, undstack.pv_pa + (UND_STACK_SIZE * PAGE_SIZE) - 1, 974 undstack.pv_va, undstack.pv_va + (UND_STACK_SIZE * PAGE_SIZE) - 1, 975 UND_STACK_SIZE); 976 printf(mem_fmt, "SVC stack", 977 kernelstack.pv_pa, kernelstack.pv_pa + (UPAGES * PAGE_SIZE) - 1, 978 kernelstack.pv_va, kernelstack.pv_va + (UPAGES * PAGE_SIZE) - 1, 979 UPAGES); 980 printf(mem_fmt_nov, "Message Buffer", 981 msgbufphys, msgbufphys + msgbuf_pgs * PAGE_SIZE - 1, msgbuf_pgs); 982 printf(mem_fmt, "Free Memory", physical_freestart, physical_freeend-1, 983 KERN_PHYSTOV(physical_freestart), KERN_PHYSTOV(physical_freeend-1), 984 free_pages); 985 #endif 986 987 /* 988 * Now we have the real page tables in place so we can switch to them. 989 * Once this is done we will be running with the REAL kernel page 990 * tables. 991 */ 992 993 /* Switch tables */ 994 #ifdef VERBOSE_INIT_ARM 995 printf("switching to new L1 page table @%#lx...", l1_pa); 996 #endif 997 998 cpu_domains((DOMAIN_CLIENT << (PMAP_DOMAIN_KERNEL*2)) | DOMAIN_CLIENT); 999 setttb(l1_pa); 1000 cpu_tlb_flushID(); 1001 cpu_domains(DOMAIN_CLIENT << (PMAP_DOMAIN_KERNEL*2)); 1002 1003 #ifdef VERBOSE_INIT_ARM 1004 printf("OK.\n"); 1005 #endif 1006 } 1007
Indexes created Thu Oct 16 14:10:15 GMT 2025