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 106 107 /* Exported for mm/init.c:paging_init. */ 108 unsigned long cmdline_memory_size __initdata = 0; 109 110 static void 111 prom_console_write(struct console *con, const char *s, unsigned n) 112 { 113 prom_write(s, n); 114 } 115 116 static struct console prom_debug_console = { 117 .name = "debug", 118 .write = prom_console_write, 119 .flags = CON_PRINTBUFFER, 120 .index = -1, 121 }; 122 123 /* 124 * Process kernel command line switches that are specific to the 125 * SPARC or that require special low-level processing. 126 */ 127 static void __init process_switch(char c) 128 { 129 switch (c) { 130 case 'd': 131 boot_flags |= BOOTME_DEBUG; 132 break; 133 case 's': 134 break; 135 case 'h': 136 prom_printf("boot_flags_init: Halt!\n"); 137 prom_halt(); 138 break; 139 case 'p': 140 /* Use PROM debug console. */ 141 register_console(&prom_debug_console); 142 break; 143 default: 144 printk("Unknown boot switch (-%c)\n", c); 145 break; 146 } 147 } 148 149 static void __init process_console(char *commands) 150 { 151 serial_console = 0; 152 commands += 8; 153 /* Linux-style serial */ 154 if (!strncmp(commands, "ttyS", 4)) 155 serial_console = simple_strtoul(commands + 4, NULL, 10) + 1; 156 else if (!strncmp(commands, "tty", 3)) { 157 char c = *(commands + 3); 158 /* Solaris-style serial */ 159 if (c == 'a' || c == 'b') 160 serial_console = c - 'a' + 1; 161 /* else Linux-style fbcon, not serial */ 162 } 163 #if defined(CONFIG_PROM_CONSOLE) 164 if (!strncmp(commands, "prom", 4)) { 165 char *p; 166 167 for (p = commands - 8; *p && *p != ' '; p++) 168 *p = ' '; 169 conswitchp = &prom_con; 170 } 171 #endif 172 } 173 174 static void __init boot_flags_init(char *commands) 175 { 176 while (*commands) { 177 /* Move to the start of the next "argument". */ 178 while (*commands && *commands == ' ') 179 commands++; 180 181 /* Process any command switches, otherwise skip it. */ 182 if (*commands == '\0') 183 break; 184 if (*commands == '-') { 185 commands++; 186 while (*commands && *commands != ' ') 187 process_switch(*commands++); 188 continue; 189 } 190 if (!strncmp(commands, "console=", 8)) { 191 process_console(commands); 192 } else if (!strncmp(commands, "mem=", 4)) { 193 /* 194 * "mem=XXX[kKmM] overrides the PROM-reported 195 * memory size. 196 */ 197 cmdline_memory_size = simple_strtoul(commands + 4, 198 &commands, 0); 199 if (*commands == 'K' || *commands == 'k') { 200 cmdline_memory_size <<= 10; 201 commands++; 202 } else if (*commands=='M' || *commands=='m') { 203 cmdline_memory_size <<= 20; 204 commands++; 205 } 206 } 207 while (*commands && *commands != ' ') 208 commands++; 209 } 210 } 211 212 /* This routine will in the future do all the nasty prom stuff 213 * to probe for the mmu type and its parameters, etc. This will 214 * also be where SMP things happen plus the Sparc specific memory 215 * physical memory probe as on the alpha. 216 */ 217 218 extern int prom_probe_memory(void); 219 extern void sun4c_probe_vac(void); 220 extern char cputypval; 221 extern unsigned long start, end; 222 extern void panic_setup(char *, int *); 223 224 extern unsigned short root_flags; 225 extern unsigned short root_dev; 226 extern unsigned short ram_flags; 227 #define RAMDISK_IMAGE_START_MASK 0x07FF 228 #define RAMDISK_PROMPT_FLAG 0x8000 229 #define RAMDISK_LOAD_FLAG 0x4000 230 231 extern int root_mountflags; 232 233 char reboot_command[COMMAND_LINE_SIZE]; 234 enum sparc_cpu sparc_cpu_model; 235 236 struct tt_entry *sparc_ttable; 237 238 struct pt_regs fake_swapper_regs; 239 240 void __init setup_arch(char **cmdline_p) 241 { 242 int i; 243 unsigned long highest_paddr; 244 245 sparc_ttable = (struct tt_entry *) &start; 246 247 /* Initialize PROM console and command line. */ 248 *cmdline_p = prom_getbootargs(); 249 strcpy(boot_command_line, *cmdline_p); 250 251 /* Set sparc_cpu_model */ 252 sparc_cpu_model = sun_unknown; 253 if(!strcmp(&cputypval,"sun4 ")) { sparc_cpu_model=sun4; } 254 if(!strcmp(&cputypval,"sun4c")) { sparc_cpu_model=sun4c; } 255 if(!strcmp(&cputypval,"sun4m")) { sparc_cpu_model=sun4m; } 256 if(!strcmp(&cputypval,"sun4s")) { sparc_cpu_model=sun4m; } /* CP-1200 with PROM 2.30 -E */ 257 if(!strcmp(&cputypval,"sun4d")) { sparc_cpu_model=sun4d; } 258 if(!strcmp(&cputypval,"sun4e")) { sparc_cpu_model=sun4e; } 259 if(!strcmp(&cputypval,"sun4u")) { sparc_cpu_model=sun4u; } 260 261 #ifdef CONFIG_SUN4 262 if (sparc_cpu_model != sun4) { 263 prom_printf("This kernel is for Sun4 architecture only.\n"); 264 prom_halt(); 265 } 266 #endif 267 printk("ARCH: "); 268 switch(sparc_cpu_model) { 269 case sun4: 270 printk("SUN4\n"); 271 break; 272 case sun4c: 273 printk("SUN4C\n"); 274 break; 275 case sun4m: 276 printk("SUN4M\n"); 277 break; 278 case sun4d: 279 printk("SUN4D\n"); 280 break; 281 case sun4e: 282 printk("SUN4E\n"); 283 break; 284 case sun4u: 285 printk("SUN4U\n"); 286 break; 287 default: 288 printk("UNKNOWN!\n"); 289 break; 290 }; 291 292 #ifdef CONFIG_DUMMY_CONSOLE 293 conswitchp = &dummy_con; 294 #elif defined(CONFIG_PROM_CONSOLE) 295 conswitchp = &prom_con; 296 #endif 297 boot_flags_init(*cmdline_p); 298 299 idprom_init(); 300 if (ARCH_SUN4C_SUN4) 301 sun4c_probe_vac(); 302 load_mmu(); 303 (void) prom_probe_memory(); 304 305 phys_base = 0xffffffffUL; 306 highest_paddr = 0UL; 307 for (i = 0; sp_banks[i].num_bytes != 0; i++) { 308 unsigned long top; 309 310 if (sp_banks[i].base_addr < phys_base) 311 phys_base = sp_banks[i].base_addr; 312 top = sp_banks[i].base_addr + 313 sp_banks[i].num_bytes; 314 if (highest_paddr < top) 315 highest_paddr = top; 316 } 317 pfn_base = phys_base >> PAGE_SHIFT; 318 319 if (!root_flags) 320 root_mountflags &= ~MS_RDONLY; 321 ROOT_DEV = old_decode_dev(root_dev); 322 #ifdef CONFIG_BLK_DEV_RAM 323 rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK; 324 rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0); 325 rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0); 326 #endif 327 328 prom_setsync(prom_sync_me); 329 330 if((boot_flags&BOOTME_DEBUG) && (linux_dbvec!=0) && 331 ((*(short *)linux_dbvec) != -1)) { 332 printk("Booted under KADB. Syncing trap table.\n"); 333 (*(linux_dbvec->teach_debugger))(); 334 } 335 336 init_mm.context = (unsigned long) NO_CONTEXT; 337 init_task.thread.kregs = &fake_swapper_regs; 338 339 paging_init(); 340 341 smp_setup_cpu_possible_map(); 342 } 343 344 static int __init set_preferred_console(void) 345 { 346 int idev, odev; 347 348 /* The user has requested a console so this is already set up. */ 349 if (serial_console >= 0) 350 return -EBUSY; 351 352 idev = prom_query_input_device(); 353 odev = prom_query_output_device(); 354 if (idev == PROMDEV_IKBD && odev == PROMDEV_OSCREEN) { 355 serial_console = 0; 356 } else if (idev == PROMDEV_ITTYA && odev == PROMDEV_OTTYA) { 357 serial_console = 1; 358 } else if (idev == PROMDEV_ITTYB && odev == PROMDEV_OTTYB) { 359 serial_console = 2; 360 } else if (idev == PROMDEV_I_UNK && odev == PROMDEV_OTTYA) { 361 prom_printf("MrCoffee ttya\n"); 362 serial_console = 1; 363 } else if (idev == PROMDEV_I_UNK && odev == PROMDEV_OSCREEN) { 364 serial_console = 0; 365 prom_printf("MrCoffee keyboard\n"); 366 } else { 367 prom_printf("Confusing console (idev %d, odev %d)\n", 368 idev, odev); 369 serial_console = 1; 370 } 371 372 if (serial_console) 373 return add_preferred_console("ttyS", serial_console - 1, NULL); 374 375 return -ENODEV; 376 } 377 console_initcall(set_preferred_console); 378 379 extern char *sparc_cpu_type; 380 extern char *sparc_fpu_type; 381 382 static int ncpus_probed; 383 384 static int show_cpuinfo(struct seq_file *m, void *__unused) 385 { 386 seq_printf(m, 387 "cpu\t\t: %s\n" 388 "fpu\t\t: %s\n" 389 "promlib\t\t: Version %d Revision %d\n" 390 "prom\t\t: %d.%d\n" 391 "type\t\t: %s\n" 392 "ncpus probed\t: %d\n" 393 "ncpus active\t: %d\n" 394 #ifndef CONFIG_SMP 395 "CPU0Bogo\t: %lu.%02lu\n" 396 "CPU0ClkTck\t: %ld\n" 397 #endif 398 , 399 sparc_cpu_type ? sparc_cpu_type : "undetermined", 400 sparc_fpu_type ? sparc_fpu_type : "undetermined", 401 romvec->pv_romvers, 402 prom_rev, 403 romvec->pv_printrev >> 16, 404 romvec->pv_printrev & 0xffff, 405 &cputypval, 406 ncpus_probed, 407 num_online_cpus() 408 #ifndef CONFIG_SMP 409 , cpu_data(0).udelay_val/(500000/HZ), 410 (cpu_data(0).udelay_val/(5000/HZ)) % 100, 411 cpu_data(0).clock_tick 412 #endif 413 ); 414 415 #ifdef CONFIG_SMP 416 smp_bogo(m); 417 #endif 418 mmu_info(m); 419 #ifdef CONFIG_SMP 420 smp_info(m); 421 #endif 422 return 0; 423 } 424 425 static void *c_start(struct seq_file *m, loff_t *pos) 426 { 427 /* The pointer we are returning is arbitrary, 428 * it just has to be non-NULL and not IS_ERR 429 * in the success case. 430 */ 431 return *pos == 0 ? &c_start : NULL; 432 } 433 434 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 435 { 436 ++*pos; 437 return c_start(m, pos); 438 } 439 440 static void c_stop(struct seq_file *m, void *v) 441 { 442 } 443 444 struct seq_operations cpuinfo_op = { 445 .start =c_start, 446 .next = c_next, 447 .stop = c_stop, 448 .show = show_cpuinfo, 449 }; 450 451 extern int stop_a_enabled; 452 453 void sun_do_break(void) 454 { 455 if (!stop_a_enabled) 456 return; 457 458 printk("\n"); 459 flush_user_windows(); 460 461 prom_cmdline(); 462 } 463 464 int serial_console = -1; 465 int stop_a_enabled = 1; 466 467 static int __init topology_init(void) 468 { 469 int i, ncpus, err; 470 471 /* Count the number of physically present processors in 472 * the machine, even on uniprocessor, so that /proc/cpuinfo 473 * output is consistent with 2.4.x 474 */ 475 ncpus = 0; 476 while (!cpu_find_by_instance(ncpus, NULL, NULL)) 477 ncpus++; 478 ncpus_probed = ncpus; 479 480 err = 0; 481 for_each_online_cpu(i) { 482 struct cpu *p = kzalloc(sizeof(*p), GFP_KERNEL); 483 if (!p) 484 err = -ENOMEM; 485 else 486 register_cpu(p, i); 487 } 488 489 return err; 490 } 491 492 subsys_initcall(topology_init); 493