1 /* 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 #include "kernel.h" 50 51 struct screen_info screen_info = { 52 0, 0, /* orig-x, orig-y */ 53 0, /* unused */ 54 0, /* orig-video-page */ 55 0, /* orig-video-mode */ 56 128, /* orig-video-cols */ 57 0,0,0, /* ega_ax, ega_bx, ega_cx */ 58 54, /* orig-video-lines */ 59 0, /* orig-video-isVGA */ 60 16 /* orig-video-points */ 61 }; 62 63 /* Typing sync at the prom prompt calls the function pointed to by 64 * romvec->pv_synchook which I set to the following function. 65 * This should sync all filesystems and return, for now it just 66 * prints out pretty messages and returns. 67 */ 68 69 extern unsigned long trapbase; 70 71 /* Pretty sick eh? */ 72 static 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 prom_printf("PROM SYNC COMMAND...\n"); 85 show_free_areas(); 86 if(current->pid != 0) { 87 local_irq_enable(); 88 sys_sync(); 89 local_irq_disable(); 90 } 91 prom_printf("Returning to prom\n"); 92 93 __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t" 94 "nop\n\t" 95 "nop\n\t" 96 "nop\n\t" : : "r" (prom_tbr)); 97 local_irq_restore(flags); 98 } 99 100 static unsigned int boot_flags __initdata = 0; 101 #define BOOTME_DEBUG 0x1 102 103 /* Exported for mm/init.c:paging_init. */ 104 unsigned long cmdline_memory_size __initdata = 0; 105 106 static void 107 prom_console_write(struct console *con, const char *s, unsigned n) 108 { 109 prom_write(s, n); 110 } 111 112 static struct console prom_debug_console = { 113 .name = "debug", 114 .write = prom_console_write, 115 .flags = CON_PRINTBUFFER, 116 .index = -1, 117 }; 118 119 /* 120 * Process kernel command line switches that are specific to the 121 * SPARC or that require special low-level processing. 122 */ 123 static void __init process_switch(char c) 124 { 125 switch (c) { 126 case 'd': 127 boot_flags |= BOOTME_DEBUG; 128 break; 129 case 's': 130 break; 131 case 'h': 132 prom_printf("boot_flags_init: Halt!\n"); 133 prom_halt(); 134 break; 135 case 'p': 136 /* Use PROM debug console. */ 137 register_console(&prom_debug_console); 138 break; 139 default: 140 printk("Unknown boot switch (-%c)\n", c); 141 break; 142 } 143 } 144 145 static void __init boot_flags_init(char *commands) 146 { 147 while (*commands) { 148 /* Move to the start of the next "argument". */ 149 while (*commands && *commands == ' ') 150 commands++; 151 152 /* Process any command switches, otherwise skip it. */ 153 if (*commands == '\0') 154 break; 155 if (*commands == '-') { 156 commands++; 157 while (*commands && *commands != ' ') 158 process_switch(*commands++); 159 continue; 160 } 161 if (!strncmp(commands, "mem=", 4)) { 162 /* 163 * "mem=XXX[kKmM] overrides the PROM-reported 164 * memory size. 165 */ 166 cmdline_memory_size = simple_strtoul(commands + 4, 167 &commands, 0); 168 if (*commands == 'K' || *commands == 'k') { 169 cmdline_memory_size <<= 10; 170 commands++; 171 } else if (*commands=='M' || *commands=='m') { 172 cmdline_memory_size <<= 20; 173 commands++; 174 } 175 } 176 while (*commands && *commands != ' ') 177 commands++; 178 } 179 } 180 181 /* This routine will in the future do all the nasty prom stuff 182 * to probe for the mmu type and its parameters, etc. This will 183 * also be where SMP things happen. 184 */ 185 186 extern void sun4c_probe_vac(void); 187 extern char cputypval; 188 189 extern unsigned short root_flags; 190 extern unsigned short root_dev; 191 extern unsigned short ram_flags; 192 #define RAMDISK_IMAGE_START_MASK 0x07FF 193 #define RAMDISK_PROMPT_FLAG 0x8000 194 #define RAMDISK_LOAD_FLAG 0x4000 195 196 extern int root_mountflags; 197 198 char reboot_command[COMMAND_LINE_SIZE]; 199 200 enum sparc_cpu sparc_cpu_model; 201 EXPORT_SYMBOL(sparc_cpu_model); 202 203 struct tt_entry *sparc_ttable; 204 205 struct pt_regs fake_swapper_regs; 206 207 void __init setup_arch(char **cmdline_p) 208 { 209 int i; 210 unsigned long highest_paddr; 211 212 sparc_ttable = (struct tt_entry *) &trapbase; 213 214 /* Initialize PROM console and command line. */ 215 *cmdline_p = prom_getbootargs(); 216 strcpy(boot_command_line, *cmdline_p); 217 parse_early_param(); 218 219 /* Set sparc_cpu_model */ 220 sparc_cpu_model = sun_unknown; 221 if (!strcmp(&cputypval,"sun4 ")) 222 sparc_cpu_model = sun4; 223 if (!strcmp(&cputypval,"sun4c")) 224 sparc_cpu_model = sun4c; 225 if (!strcmp(&cputypval,"sun4m")) 226 sparc_cpu_model = sun4m; 227 if (!strcmp(&cputypval,"sun4s")) 228 sparc_cpu_model = sun4m; /* CP-1200 with PROM 2.30 -E */ 229 if (!strcmp(&cputypval,"sun4d")) 230 sparc_cpu_model = sun4d; 231 if (!strcmp(&cputypval,"sun4e")) 232 sparc_cpu_model = sun4e; 233 if (!strcmp(&cputypval,"sun4u")) 234 sparc_cpu_model = sun4u; 235 if (!strncmp(&cputypval, "leon" , 4)) 236 sparc_cpu_model = sparc_leon; 237 238 printk("ARCH: "); 239 switch(sparc_cpu_model) { 240 case sun4: 241 printk("SUN4\n"); 242 break; 243 case sun4c: 244 printk("SUN4C\n"); 245 break; 246 case sun4m: 247 printk("SUN4M\n"); 248 break; 249 case sun4d: 250 printk("SUN4D\n"); 251 break; 252 case sun4e: 253 printk("SUN4E\n"); 254 break; 255 case sun4u: 256 printk("SUN4U\n"); 257 break; 258 case sparc_leon: 259 printk("LEON\n"); 260 break; 261 default: 262 printk("UNKNOWN!\n"); 263 break; 264 }; 265 266 #ifdef CONFIG_DUMMY_CONSOLE 267 conswitchp = &dummy_con; 268 #endif 269 boot_flags_init(*cmdline_p); 270 271 idprom_init(); 272 if (ARCH_SUN4C) 273 sun4c_probe_vac(); 274 load_mmu(); 275 276 phys_base = 0xffffffffUL; 277 highest_paddr = 0UL; 278 for (i = 0; sp_banks[i].num_bytes != 0; i++) { 279 unsigned long top; 280 281 if (sp_banks[i].base_addr < phys_base) 282 phys_base = sp_banks[i].base_addr; 283 top = sp_banks[i].base_addr + 284 sp_banks[i].num_bytes; 285 if (highest_paddr < top) 286 highest_paddr = top; 287 } 288 pfn_base = phys_base >> PAGE_SHIFT; 289 290 if (!root_flags) 291 root_mountflags &= ~MS_RDONLY; 292 ROOT_DEV = old_decode_dev(root_dev); 293 #ifdef CONFIG_BLK_DEV_RAM 294 rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK; 295 rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0); 296 rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0); 297 #endif 298 299 prom_setsync(prom_sync_me); 300 301 if((boot_flags&BOOTME_DEBUG) && (linux_dbvec!=0) && 302 ((*(short *)linux_dbvec) != -1)) { 303 printk("Booted under KADB. Syncing trap table.\n"); 304 (*(linux_dbvec->teach_debugger))(); 305 } 306 307 init_mm.context = (unsigned long) NO_CONTEXT; 308 init_task.thread.kregs = &fake_swapper_regs; 309 310 paging_init(); 311 312 smp_setup_cpu_possible_map(); 313 } 314 315 static int ncpus_probed; 316 317 static int show_cpuinfo(struct seq_file *m, void *__unused) 318 { 319 seq_printf(m, 320 "cpu\t\t: %s\n" 321 "fpu\t\t: %s\n" 322 "promlib\t\t: Version %d Revision %d\n" 323 "prom\t\t: %d.%d\n" 324 "type\t\t: %s\n" 325 "ncpus probed\t: %d\n" 326 "ncpus active\t: %d\n" 327 #ifndef CONFIG_SMP 328 "CPU0Bogo\t: %lu.%02lu\n" 329 "CPU0ClkTck\t: %ld\n" 330 #endif 331 , 332 sparc_cpu_type, 333 sparc_fpu_type , 334 romvec->pv_romvers, 335 prom_rev, 336 romvec->pv_printrev >> 16, 337 romvec->pv_printrev & 0xffff, 338 &cputypval, 339 ncpus_probed, 340 num_online_cpus() 341 #ifndef CONFIG_SMP 342 , cpu_data(0).udelay_val/(500000/HZ), 343 (cpu_data(0).udelay_val/(5000/HZ)) % 100, 344 cpu_data(0).clock_tick 345 #endif 346 ); 347 348 #ifdef CONFIG_SMP 349 smp_bogo(m); 350 #endif 351 mmu_info(m); 352 #ifdef CONFIG_SMP 353 smp_info(m); 354 #endif 355 return 0; 356 } 357 358 static void *c_start(struct seq_file *m, loff_t *pos) 359 { 360 /* The pointer we are returning is arbitrary, 361 * it just has to be non-NULL and not IS_ERR 362 * in the success case. 363 */ 364 return *pos == 0 ? &c_start : NULL; 365 } 366 367 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 368 { 369 ++*pos; 370 return c_start(m, pos); 371 } 372 373 static void c_stop(struct seq_file *m, void *v) 374 { 375 } 376 377 const struct seq_operations cpuinfo_op = { 378 .start =c_start, 379 .next = c_next, 380 .stop = c_stop, 381 .show = show_cpuinfo, 382 }; 383 384 extern int stop_a_enabled; 385 386 void sun_do_break(void) 387 { 388 if (!stop_a_enabled) 389 return; 390 391 printk("\n"); 392 flush_user_windows(); 393 394 prom_cmdline(); 395 } 396 EXPORT_SYMBOL(sun_do_break); 397 398 int stop_a_enabled = 1; 399 400 static int __init topology_init(void) 401 { 402 int i, ncpus, err; 403 404 /* Count the number of physically present processors in 405 * the machine, even on uniprocessor, so that /proc/cpuinfo 406 * output is consistent with 2.4.x 407 */ 408 ncpus = 0; 409 while (!cpu_find_by_instance(ncpus, NULL, NULL)) 410 ncpus++; 411 ncpus_probed = ncpus; 412 413 err = 0; 414 for_each_online_cpu(i) { 415 struct cpu *p = kzalloc(sizeof(*p), GFP_KERNEL); 416 if (!p) 417 err = -ENOMEM; 418 else 419 register_cpu(p, i); 420 } 421 422 return err; 423 } 424 425 subsys_initcall(topology_init); 426