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 #include <linux/kdebug.h> 35 36 #include <asm/system.h> 37 #include <asm/io.h> 38 #include <asm/processor.h> 39 #include <asm/oplib.h> 40 #include <asm/page.h> 41 #include <asm/pgtable.h> 42 #include <asm/traps.h> 43 #include <asm/vaddrs.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 boot_flags_init(char *commands) 150 { 151 while (*commands) { 152 /* Move to the start of the next "argument". */ 153 while (*commands && *commands == ' ') 154 commands++; 155 156 /* Process any command switches, otherwise skip it. */ 157 if (*commands == '\0') 158 break; 159 if (*commands == '-') { 160 commands++; 161 while (*commands && *commands != ' ') 162 process_switch(*commands++); 163 continue; 164 } 165 if (!strncmp(commands, "mem=", 4)) { 166 /* 167 * "mem=XXX[kKmM] overrides the PROM-reported 168 * memory size. 169 */ 170 cmdline_memory_size = simple_strtoul(commands + 4, 171 &commands, 0); 172 if (*commands == 'K' || *commands == 'k') { 173 cmdline_memory_size <<= 10; 174 commands++; 175 } else if (*commands=='M' || *commands=='m') { 176 cmdline_memory_size <<= 20; 177 commands++; 178 } 179 } 180 while (*commands && *commands != ' ') 181 commands++; 182 } 183 } 184 185 /* This routine will in the future do all the nasty prom stuff 186 * to probe for the mmu type and its parameters, etc. This will 187 * also be where SMP things happen plus the Sparc specific memory 188 * physical memory probe as on the alpha. 189 */ 190 191 extern int prom_probe_memory(void); 192 extern void sun4c_probe_vac(void); 193 extern char cputypval; 194 extern unsigned long start, end; 195 extern void panic_setup(char *, int *); 196 197 extern unsigned short root_flags; 198 extern unsigned short root_dev; 199 extern unsigned short ram_flags; 200 #define RAMDISK_IMAGE_START_MASK 0x07FF 201 #define RAMDISK_PROMPT_FLAG 0x8000 202 #define RAMDISK_LOAD_FLAG 0x4000 203 204 extern int root_mountflags; 205 206 char reboot_command[COMMAND_LINE_SIZE]; 207 enum sparc_cpu sparc_cpu_model; 208 209 struct tt_entry *sparc_ttable; 210 211 struct pt_regs fake_swapper_regs; 212 213 void __init setup_arch(char **cmdline_p) 214 { 215 int i; 216 unsigned long highest_paddr; 217 218 sparc_ttable = (struct tt_entry *) &start; 219 220 /* Initialize PROM console and command line. */ 221 *cmdline_p = prom_getbootargs(); 222 strcpy(boot_command_line, *cmdline_p); 223 224 /* Set sparc_cpu_model */ 225 sparc_cpu_model = sun_unknown; 226 if(!strcmp(&cputypval,"sun4 ")) { sparc_cpu_model=sun4; } 227 if(!strcmp(&cputypval,"sun4c")) { sparc_cpu_model=sun4c; } 228 if(!strcmp(&cputypval,"sun4m")) { sparc_cpu_model=sun4m; } 229 if(!strcmp(&cputypval,"sun4s")) { sparc_cpu_model=sun4m; } /* CP-1200 with PROM 2.30 -E */ 230 if(!strcmp(&cputypval,"sun4d")) { sparc_cpu_model=sun4d; } 231 if(!strcmp(&cputypval,"sun4e")) { sparc_cpu_model=sun4e; } 232 if(!strcmp(&cputypval,"sun4u")) { sparc_cpu_model=sun4u; } 233 234 #ifdef CONFIG_SUN4 235 if (sparc_cpu_model != sun4) { 236 prom_printf("This kernel is for Sun4 architecture only.\n"); 237 prom_halt(); 238 } 239 #endif 240 printk("ARCH: "); 241 switch(sparc_cpu_model) { 242 case sun4: 243 printk("SUN4\n"); 244 break; 245 case sun4c: 246 printk("SUN4C\n"); 247 break; 248 case sun4m: 249 printk("SUN4M\n"); 250 break; 251 case sun4d: 252 printk("SUN4D\n"); 253 break; 254 case sun4e: 255 printk("SUN4E\n"); 256 break; 257 case sun4u: 258 printk("SUN4U\n"); 259 break; 260 default: 261 printk("UNKNOWN!\n"); 262 break; 263 }; 264 265 #ifdef CONFIG_DUMMY_CONSOLE 266 conswitchp = &dummy_con; 267 #elif defined(CONFIG_PROM_CONSOLE) 268 conswitchp = &prom_con; 269 #endif 270 boot_flags_init(*cmdline_p); 271 272 idprom_init(); 273 if (ARCH_SUN4C_SUN4) 274 sun4c_probe_vac(); 275 load_mmu(); 276 (void) prom_probe_memory(); 277 278 phys_base = 0xffffffffUL; 279 highest_paddr = 0UL; 280 for (i = 0; sp_banks[i].num_bytes != 0; i++) { 281 unsigned long top; 282 283 if (sp_banks[i].base_addr < phys_base) 284 phys_base = sp_banks[i].base_addr; 285 top = sp_banks[i].base_addr + 286 sp_banks[i].num_bytes; 287 if (highest_paddr < top) 288 highest_paddr = top; 289 } 290 pfn_base = phys_base >> PAGE_SHIFT; 291 292 if (!root_flags) 293 root_mountflags &= ~MS_RDONLY; 294 ROOT_DEV = old_decode_dev(root_dev); 295 #ifdef CONFIG_BLK_DEV_RAM 296 rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK; 297 rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0); 298 rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0); 299 #endif 300 301 prom_setsync(prom_sync_me); 302 303 if((boot_flags&BOOTME_DEBUG) && (linux_dbvec!=0) && 304 ((*(short *)linux_dbvec) != -1)) { 305 printk("Booted under KADB. Syncing trap table.\n"); 306 (*(linux_dbvec->teach_debugger))(); 307 } 308 309 init_mm.context = (unsigned long) NO_CONTEXT; 310 init_task.thread.kregs = &fake_swapper_regs; 311 312 paging_init(); 313 314 smp_setup_cpu_possible_map(); 315 } 316 317 extern char *sparc_cpu_type; 318 extern char *sparc_fpu_type; 319 320 static int ncpus_probed; 321 322 static int show_cpuinfo(struct seq_file *m, void *__unused) 323 { 324 seq_printf(m, 325 "cpu\t\t: %s\n" 326 "fpu\t\t: %s\n" 327 "promlib\t\t: Version %d Revision %d\n" 328 "prom\t\t: %d.%d\n" 329 "type\t\t: %s\n" 330 "ncpus probed\t: %d\n" 331 "ncpus active\t: %d\n" 332 #ifndef CONFIG_SMP 333 "CPU0Bogo\t: %lu.%02lu\n" 334 "CPU0ClkTck\t: %ld\n" 335 #endif 336 , 337 sparc_cpu_type ? sparc_cpu_type : "undetermined", 338 sparc_fpu_type ? sparc_fpu_type : "undetermined", 339 romvec->pv_romvers, 340 prom_rev, 341 romvec->pv_printrev >> 16, 342 romvec->pv_printrev & 0xffff, 343 &cputypval, 344 ncpus_probed, 345 num_online_cpus() 346 #ifndef CONFIG_SMP 347 , cpu_data(0).udelay_val/(500000/HZ), 348 (cpu_data(0).udelay_val/(5000/HZ)) % 100, 349 cpu_data(0).clock_tick 350 #endif 351 ); 352 353 #ifdef CONFIG_SMP 354 smp_bogo(m); 355 #endif 356 mmu_info(m); 357 #ifdef CONFIG_SMP 358 smp_info(m); 359 #endif 360 return 0; 361 } 362 363 static void *c_start(struct seq_file *m, loff_t *pos) 364 { 365 /* The pointer we are returning is arbitrary, 366 * it just has to be non-NULL and not IS_ERR 367 * in the success case. 368 */ 369 return *pos == 0 ? &c_start : NULL; 370 } 371 372 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 373 { 374 ++*pos; 375 return c_start(m, pos); 376 } 377 378 static void c_stop(struct seq_file *m, void *v) 379 { 380 } 381 382 struct seq_operations cpuinfo_op = { 383 .start =c_start, 384 .next = c_next, 385 .stop = c_stop, 386 .show = show_cpuinfo, 387 }; 388 389 extern int stop_a_enabled; 390 391 void sun_do_break(void) 392 { 393 if (!stop_a_enabled) 394 return; 395 396 printk("\n"); 397 flush_user_windows(); 398 399 prom_cmdline(); 400 } 401 402 int stop_a_enabled = 1; 403 404 static int __init topology_init(void) 405 { 406 int i, ncpus, err; 407 408 /* Count the number of physically present processors in 409 * the machine, even on uniprocessor, so that /proc/cpuinfo 410 * output is consistent with 2.4.x 411 */ 412 ncpus = 0; 413 while (!cpu_find_by_instance(ncpus, NULL, NULL)) 414 ncpus++; 415 ncpus_probed = ncpus; 416 417 err = 0; 418 for_each_online_cpu(i) { 419 struct cpu *p = kzalloc(sizeof(*p), GFP_KERNEL); 420 if (!p) 421 err = -ENOMEM; 422 else 423 register_cpu(p, i); 424 } 425 426 return err; 427 } 428 429 subsys_initcall(topology_init); 430