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