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