1 /* $Id: setup.c,v 1.126 2001/11/13 00:49:27 davem Exp $ 2 * linux/arch/sparc/kernel/setup.c 3 * 4 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) 5 * Copyright (C) 2000 Anton Blanchard (anton@samba.org) 6 */ 7 8 #include <linux/errno.h> 9 #include <linux/sched.h> 10 #include <linux/kernel.h> 11 #include <linux/mm.h> 12 #include <linux/stddef.h> 13 #include <linux/unistd.h> 14 #include <linux/ptrace.h> 15 #include <linux/slab.h> 16 #include <linux/initrd.h> 17 #include <asm/smp.h> 18 #include <linux/user.h> 19 #include <linux/a.out.h> 20 #include <linux/screen_info.h> 21 #include <linux/delay.h> 22 #include <linux/fs.h> 23 #include <linux/seq_file.h> 24 #include <linux/syscalls.h> 25 #include <linux/kdev_t.h> 26 #include <linux/major.h> 27 #include <linux/string.h> 28 #include <linux/init.h> 29 #include <linux/interrupt.h> 30 #include <linux/console.h> 31 #include <linux/spinlock.h> 32 #include <linux/root_dev.h> 33 #include <linux/cpu.h> 34 35 #include <asm/system.h> 36 #include <asm/io.h> 37 #include <asm/processor.h> 38 #include <asm/oplib.h> 39 #include <asm/page.h> 40 #include <asm/pgtable.h> 41 #include <asm/traps.h> 42 #include <asm/vaddrs.h> 43 #include <asm/kdebug.h> 44 #include <asm/mbus.h> 45 #include <asm/idprom.h> 46 #include <asm/machines.h> 47 #include <asm/cpudata.h> 48 #include <asm/setup.h> 49 50 struct screen_info screen_info = { 51 0, 0, /* orig-x, orig-y */ 52 0, /* unused */ 53 0, /* orig-video-page */ 54 0, /* orig-video-mode */ 55 128, /* orig-video-cols */ 56 0,0,0, /* ega_ax, ega_bx, ega_cx */ 57 54, /* orig-video-lines */ 58 0, /* orig-video-isVGA */ 59 16 /* orig-video-points */ 60 }; 61 62 /* Typing sync at the prom prompt calls the function pointed to by 63 * romvec->pv_synchook which I set to the following function. 64 * This should sync all filesystems and return, for now it just 65 * prints out pretty messages and returns. 66 */ 67 68 extern unsigned long trapbase; 69 void (*prom_palette)(int); 70 71 /* Pretty sick eh? */ 72 void prom_sync_me(void) 73 { 74 unsigned long prom_tbr, flags; 75 76 /* XXX Badly broken. FIX! - Anton */ 77 local_irq_save(flags); 78 __asm__ __volatile__("rd %%tbr, %0\n\t" : "=r" (prom_tbr)); 79 __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t" 80 "nop\n\t" 81 "nop\n\t" 82 "nop\n\t" : : "r" (&trapbase)); 83 84 if (prom_palette) 85 prom_palette(1); 86 prom_printf("PROM SYNC COMMAND...\n"); 87 show_free_areas(); 88 if(current->pid != 0) { 89 local_irq_enable(); 90 sys_sync(); 91 local_irq_disable(); 92 } 93 prom_printf("Returning to prom\n"); 94 95 __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t" 96 "nop\n\t" 97 "nop\n\t" 98 "nop\n\t" : : "r" (prom_tbr)); 99 local_irq_restore(flags); 100 101 return; 102 } 103 104 unsigned int boot_flags __initdata = 0; 105 #define BOOTME_DEBUG 0x1 106 #define BOOTME_SINGLE 0x2 107 108 /* Exported for mm/init.c:paging_init. */ 109 unsigned long cmdline_memory_size __initdata = 0; 110 111 static void 112 prom_console_write(struct console *con, const char *s, unsigned n) 113 { 114 prom_write(s, n); 115 } 116 117 static struct console prom_debug_console = { 118 .name = "debug", 119 .write = prom_console_write, 120 .flags = CON_PRINTBUFFER, 121 .index = -1, 122 }; 123 124 int obp_system_intr(void) 125 { 126 if (boot_flags & BOOTME_DEBUG) { 127 printk("OBP: system interrupted\n"); 128 prom_halt(); 129 return 1; 130 } 131 return 0; 132 } 133 134 /* 135 * Process kernel command line switches that are specific to the 136 * SPARC or that require special low-level processing. 137 */ 138 static void __init process_switch(char c) 139 { 140 switch (c) { 141 case 'd': 142 boot_flags |= BOOTME_DEBUG; 143 break; 144 case 's': 145 boot_flags |= BOOTME_SINGLE; 146 break; 147 case 'h': 148 prom_printf("boot_flags_init: Halt!\n"); 149 prom_halt(); 150 break; 151 case 'p': 152 /* Use PROM debug console. */ 153 register_console(&prom_debug_console); 154 break; 155 default: 156 printk("Unknown boot switch (-%c)\n", c); 157 break; 158 } 159 } 160 161 static void __init process_console(char *commands) 162 { 163 serial_console = 0; 164 commands += 8; 165 /* Linux-style serial */ 166 if (!strncmp(commands, "ttyS", 4)) 167 serial_console = simple_strtoul(commands + 4, NULL, 10) + 1; 168 else if (!strncmp(commands, "tty", 3)) { 169 char c = *(commands + 3); 170 /* Solaris-style serial */ 171 if (c == 'a' || c == 'b') 172 serial_console = c - 'a' + 1; 173 /* else Linux-style fbcon, not serial */ 174 } 175 #if defined(CONFIG_PROM_CONSOLE) 176 if (!strncmp(commands, "prom", 4)) { 177 char *p; 178 179 for (p = commands - 8; *p && *p != ' '; p++) 180 *p = ' '; 181 conswitchp = &prom_con; 182 } 183 #endif 184 } 185 186 static void __init boot_flags_init(char *commands) 187 { 188 while (*commands) { 189 /* Move to the start of the next "argument". */ 190 while (*commands && *commands == ' ') 191 commands++; 192 193 /* Process any command switches, otherwise skip it. */ 194 if (*commands == '\0') 195 break; 196 if (*commands == '-') { 197 commands++; 198 while (*commands && *commands != ' ') 199 process_switch(*commands++); 200 continue; 201 } 202 if (!strncmp(commands, "console=", 8)) { 203 process_console(commands); 204 } else if (!strncmp(commands, "mem=", 4)) { 205 /* 206 * "mem=XXX[kKmM] overrides the PROM-reported 207 * memory size. 208 */ 209 cmdline_memory_size = simple_strtoul(commands + 4, 210 &commands, 0); 211 if (*commands == 'K' || *commands == 'k') { 212 cmdline_memory_size <<= 10; 213 commands++; 214 } else if (*commands=='M' || *commands=='m') { 215 cmdline_memory_size <<= 20; 216 commands++; 217 } 218 } 219 while (*commands && *commands != ' ') 220 commands++; 221 } 222 } 223 224 /* This routine will in the future do all the nasty prom stuff 225 * to probe for the mmu type and its parameters, etc. This will 226 * also be where SMP things happen plus the Sparc specific memory 227 * physical memory probe as on the alpha. 228 */ 229 230 extern int prom_probe_memory(void); 231 extern void sun4c_probe_vac(void); 232 extern char cputypval; 233 extern unsigned long start, end; 234 extern void panic_setup(char *, int *); 235 236 extern unsigned short root_flags; 237 extern unsigned short root_dev; 238 extern unsigned short ram_flags; 239 #define RAMDISK_IMAGE_START_MASK 0x07FF 240 #define RAMDISK_PROMPT_FLAG 0x8000 241 #define RAMDISK_LOAD_FLAG 0x4000 242 243 extern int root_mountflags; 244 245 char reboot_command[COMMAND_LINE_SIZE]; 246 enum sparc_cpu sparc_cpu_model; 247 248 struct tt_entry *sparc_ttable; 249 250 struct pt_regs fake_swapper_regs; 251 252 void __init setup_arch(char **cmdline_p) 253 { 254 int i; 255 unsigned long highest_paddr; 256 257 sparc_ttable = (struct tt_entry *) &start; 258 259 /* Initialize PROM console and command line. */ 260 *cmdline_p = prom_getbootargs(); 261 strcpy(saved_command_line, *cmdline_p); 262 263 /* Set sparc_cpu_model */ 264 sparc_cpu_model = sun_unknown; 265 if(!strcmp(&cputypval,"sun4 ")) { sparc_cpu_model=sun4; } 266 if(!strcmp(&cputypval,"sun4c")) { sparc_cpu_model=sun4c; } 267 if(!strcmp(&cputypval,"sun4m")) { sparc_cpu_model=sun4m; } 268 if(!strcmp(&cputypval,"sun4s")) { sparc_cpu_model=sun4m; } /* CP-1200 with PROM 2.30 -E */ 269 if(!strcmp(&cputypval,"sun4d")) { sparc_cpu_model=sun4d; } 270 if(!strcmp(&cputypval,"sun4e")) { sparc_cpu_model=sun4e; } 271 if(!strcmp(&cputypval,"sun4u")) { sparc_cpu_model=sun4u; } 272 273 #ifdef CONFIG_SUN4 274 if (sparc_cpu_model != sun4) { 275 prom_printf("This kernel is for Sun4 architecture only.\n"); 276 prom_halt(); 277 } 278 #endif 279 printk("ARCH: "); 280 switch(sparc_cpu_model) { 281 case sun4: 282 printk("SUN4\n"); 283 break; 284 case sun4c: 285 printk("SUN4C\n"); 286 break; 287 case sun4m: 288 printk("SUN4M\n"); 289 break; 290 case sun4d: 291 printk("SUN4D\n"); 292 break; 293 case sun4e: 294 printk("SUN4E\n"); 295 break; 296 case sun4u: 297 printk("SUN4U\n"); 298 break; 299 default: 300 printk("UNKNOWN!\n"); 301 break; 302 }; 303 304 #ifdef CONFIG_DUMMY_CONSOLE 305 conswitchp = &dummy_con; 306 #elif defined(CONFIG_PROM_CONSOLE) 307 conswitchp = &prom_con; 308 #endif 309 boot_flags_init(*cmdline_p); 310 311 idprom_init(); 312 if (ARCH_SUN4C_SUN4) 313 sun4c_probe_vac(); 314 load_mmu(); 315 (void) prom_probe_memory(); 316 317 phys_base = 0xffffffffUL; 318 highest_paddr = 0UL; 319 for (i = 0; sp_banks[i].num_bytes != 0; i++) { 320 unsigned long top; 321 322 if (sp_banks[i].base_addr < phys_base) 323 phys_base = sp_banks[i].base_addr; 324 top = sp_banks[i].base_addr + 325 sp_banks[i].num_bytes; 326 if (highest_paddr < top) 327 highest_paddr = top; 328 } 329 pfn_base = phys_base >> PAGE_SHIFT; 330 331 if (!root_flags) 332 root_mountflags &= ~MS_RDONLY; 333 ROOT_DEV = old_decode_dev(root_dev); 334 #ifdef CONFIG_BLK_DEV_RAM 335 rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK; 336 rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0); 337 rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0); 338 #endif 339 340 prom_setsync(prom_sync_me); 341 342 if((boot_flags&BOOTME_DEBUG) && (linux_dbvec!=0) && 343 ((*(short *)linux_dbvec) != -1)) { 344 printk("Booted under KADB. Syncing trap table.\n"); 345 (*(linux_dbvec->teach_debugger))(); 346 } 347 348 init_mm.context = (unsigned long) NO_CONTEXT; 349 init_task.thread.kregs = &fake_swapper_regs; 350 351 smp_setup_cpu_possible_map(); 352 353 paging_init(); 354 } 355 356 static int __init set_preferred_console(void) 357 { 358 int idev, odev; 359 360 /* The user has requested a console so this is already set up. */ 361 if (serial_console >= 0) 362 return -EBUSY; 363 364 idev = prom_query_input_device(); 365 odev = prom_query_output_device(); 366 if (idev == PROMDEV_IKBD && odev == PROMDEV_OSCREEN) { 367 serial_console = 0; 368 } else if (idev == PROMDEV_ITTYA && odev == PROMDEV_OTTYA) { 369 serial_console = 1; 370 } else if (idev == PROMDEV_ITTYB && odev == PROMDEV_OTTYB) { 371 serial_console = 2; 372 } else if (idev == PROMDEV_I_UNK && odev == PROMDEV_OTTYA) { 373 prom_printf("MrCoffee ttya\n"); 374 serial_console = 1; 375 } else if (idev == PROMDEV_I_UNK && odev == PROMDEV_OSCREEN) { 376 serial_console = 0; 377 prom_printf("MrCoffee keyboard\n"); 378 } else { 379 prom_printf("Confusing console (idev %d, odev %d)\n", 380 idev, odev); 381 serial_console = 1; 382 } 383 384 if (serial_console) 385 return add_preferred_console("ttyS", serial_console - 1, NULL); 386 387 return -ENODEV; 388 } 389 console_initcall(set_preferred_console); 390 391 extern char *sparc_cpu_type; 392 extern char *sparc_fpu_type; 393 394 static int ncpus_probed; 395 396 static int show_cpuinfo(struct seq_file *m, void *__unused) 397 { 398 seq_printf(m, 399 "cpu\t\t: %s\n" 400 "fpu\t\t: %s\n" 401 "promlib\t\t: Version %d Revision %d\n" 402 "prom\t\t: %d.%d\n" 403 "type\t\t: %s\n" 404 "ncpus probed\t: %d\n" 405 "ncpus active\t: %d\n" 406 #ifndef CONFIG_SMP 407 "CPU0Bogo\t: %lu.%02lu\n" 408 "CPU0ClkTck\t: %ld\n" 409 #endif 410 , 411 sparc_cpu_type ? sparc_cpu_type : "undetermined", 412 sparc_fpu_type ? sparc_fpu_type : "undetermined", 413 romvec->pv_romvers, 414 prom_rev, 415 romvec->pv_printrev >> 16, 416 romvec->pv_printrev & 0xffff, 417 &cputypval, 418 ncpus_probed, 419 num_online_cpus() 420 #ifndef CONFIG_SMP 421 , cpu_data(0).udelay_val/(500000/HZ), 422 (cpu_data(0).udelay_val/(5000/HZ)) % 100, 423 cpu_data(0).clock_tick 424 #endif 425 ); 426 427 #ifdef CONFIG_SMP 428 smp_bogo(m); 429 #endif 430 mmu_info(m); 431 #ifdef CONFIG_SMP 432 smp_info(m); 433 #endif 434 return 0; 435 } 436 437 static void *c_start(struct seq_file *m, loff_t *pos) 438 { 439 /* The pointer we are returning is arbitrary, 440 * it just has to be non-NULL and not IS_ERR 441 * in the success case. 442 */ 443 return *pos == 0 ? &c_start : NULL; 444 } 445 446 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 447 { 448 ++*pos; 449 return c_start(m, pos); 450 } 451 452 static void c_stop(struct seq_file *m, void *v) 453 { 454 } 455 456 struct seq_operations cpuinfo_op = { 457 .start =c_start, 458 .next = c_next, 459 .stop = c_stop, 460 .show = show_cpuinfo, 461 }; 462 463 extern int stop_a_enabled; 464 465 void sun_do_break(void) 466 { 467 if (!stop_a_enabled) 468 return; 469 470 printk("\n"); 471 flush_user_windows(); 472 473 prom_cmdline(); 474 } 475 476 int serial_console = -1; 477 int stop_a_enabled = 1; 478 479 static int __init topology_init(void) 480 { 481 int i, ncpus, err; 482 483 /* Count the number of physically present processors in 484 * the machine, even on uniprocessor, so that /proc/cpuinfo 485 * output is consistent with 2.4.x 486 */ 487 ncpus = 0; 488 while (!cpu_find_by_instance(ncpus, NULL, NULL)) 489 ncpus++; 490 ncpus_probed = ncpus; 491 492 err = 0; 493 for_each_online_cpu(i) { 494 struct cpu *p = kzalloc(sizeof(*p), GFP_KERNEL); 495 if (!p) 496 err = -ENOMEM; 497 else 498 register_cpu(p, i); 499 } 500 501 return err; 502 } 503 504 subsys_initcall(topology_init); 505