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); 187 188 extern unsigned short root_flags; 189 extern unsigned short root_dev; 190 extern unsigned short ram_flags; 191 #define RAMDISK_IMAGE_START_MASK 0x07FF 192 #define RAMDISK_PROMPT_FLAG 0x8000 193 #define RAMDISK_LOAD_FLAG 0x4000 194 195 extern int root_mountflags; 196 197 char reboot_command[COMMAND_LINE_SIZE]; 198 199 enum sparc_cpu sparc_cpu_model; 200 EXPORT_SYMBOL(sparc_cpu_model); 201 202 struct tt_entry *sparc_ttable; 203 204 struct pt_regs fake_swapper_regs; 205 206 void __init setup_arch(char **cmdline_p) 207 { 208 int i; 209 unsigned long highest_paddr; 210 211 sparc_ttable = (struct tt_entry *) &trapbase; 212 213 /* Initialize PROM console and command line. */ 214 *cmdline_p = prom_getbootargs(); 215 strcpy(boot_command_line, *cmdline_p); 216 parse_early_param(); 217 218 /* Set sparc_cpu_model */ 219 sparc_cpu_model = sun_unknown; 220 if (!strcmp(&cputypval[0], "sun4 ")) 221 sparc_cpu_model = sun4; 222 if (!strcmp(&cputypval[0], "sun4c")) 223 sparc_cpu_model = sun4c; 224 if (!strcmp(&cputypval[0], "sun4m")) 225 sparc_cpu_model = sun4m; 226 if (!strcmp(&cputypval[0], "sun4s")) 227 sparc_cpu_model = sun4m; /* CP-1200 with PROM 2.30 -E */ 228 if (!strcmp(&cputypval[0], "sun4d")) 229 sparc_cpu_model = sun4d; 230 if (!strcmp(&cputypval[0], "sun4e")) 231 sparc_cpu_model = sun4e; 232 if (!strcmp(&cputypval[0], "sun4u")) 233 sparc_cpu_model = sun4u; 234 if (!strncmp(&cputypval[0], "leon" , 4)) 235 sparc_cpu_model = sparc_leon; 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 case sparc_leon: 258 printk("LEON\n"); 259 break; 260 default: 261 printk("UNKNOWN!\n"); 262 break; 263 }; 264 265 #ifdef CONFIG_DUMMY_CONSOLE 266 conswitchp = &dummy_con; 267 #endif 268 boot_flags_init(*cmdline_p); 269 270 idprom_init(); 271 if (ARCH_SUN4C) 272 sun4c_probe_vac(); 273 load_mmu(); 274 275 phys_base = 0xffffffffUL; 276 highest_paddr = 0UL; 277 for (i = 0; sp_banks[i].num_bytes != 0; i++) { 278 unsigned long top; 279 280 if (sp_banks[i].base_addr < phys_base) 281 phys_base = sp_banks[i].base_addr; 282 top = sp_banks[i].base_addr + 283 sp_banks[i].num_bytes; 284 if (highest_paddr < top) 285 highest_paddr = top; 286 } 287 pfn_base = phys_base >> PAGE_SHIFT; 288 289 if (!root_flags) 290 root_mountflags &= ~MS_RDONLY; 291 ROOT_DEV = old_decode_dev(root_dev); 292 #ifdef CONFIG_BLK_DEV_RAM 293 rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK; 294 rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0); 295 rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0); 296 #endif 297 298 prom_setsync(prom_sync_me); 299 300 if((boot_flags&BOOTME_DEBUG) && (linux_dbvec!=0) && 301 ((*(short *)linux_dbvec) != -1)) { 302 printk("Booted under KADB. Syncing trap table.\n"); 303 (*(linux_dbvec->teach_debugger))(); 304 } 305 306 init_mm.context = (unsigned long) NO_CONTEXT; 307 init_task.thread.kregs = &fake_swapper_regs; 308 309 paging_init(); 310 311 smp_setup_cpu_possible_map(); 312 } 313 314 static int ncpus_probed; 315 316 static int show_cpuinfo(struct seq_file *m, void *__unused) 317 { 318 seq_printf(m, 319 "cpu\t\t: %s\n" 320 "fpu\t\t: %s\n" 321 "promlib\t\t: Version %d Revision %d\n" 322 "prom\t\t: %d.%d\n" 323 "type\t\t: %s\n" 324 "ncpus probed\t: %d\n" 325 "ncpus active\t: %d\n" 326 #ifndef CONFIG_SMP 327 "CPU0Bogo\t: %lu.%02lu\n" 328 "CPU0ClkTck\t: %ld\n" 329 #endif 330 , 331 sparc_cpu_type, 332 sparc_fpu_type , 333 romvec->pv_romvers, 334 prom_rev, 335 romvec->pv_printrev >> 16, 336 romvec->pv_printrev & 0xffff, 337 &cputypval[0], 338 ncpus_probed, 339 num_online_cpus() 340 #ifndef CONFIG_SMP 341 , cpu_data(0).udelay_val/(500000/HZ), 342 (cpu_data(0).udelay_val/(5000/HZ)) % 100, 343 cpu_data(0).clock_tick 344 #endif 345 ); 346 347 #ifdef CONFIG_SMP 348 smp_bogo(m); 349 #endif 350 mmu_info(m); 351 #ifdef CONFIG_SMP 352 smp_info(m); 353 #endif 354 return 0; 355 } 356 357 static void *c_start(struct seq_file *m, loff_t *pos) 358 { 359 /* The pointer we are returning is arbitrary, 360 * it just has to be non-NULL and not IS_ERR 361 * in the success case. 362 */ 363 return *pos == 0 ? &c_start : NULL; 364 } 365 366 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 367 { 368 ++*pos; 369 return c_start(m, pos); 370 } 371 372 static void c_stop(struct seq_file *m, void *v) 373 { 374 } 375 376 const struct seq_operations cpuinfo_op = { 377 .start =c_start, 378 .next = c_next, 379 .stop = c_stop, 380 .show = show_cpuinfo, 381 }; 382 383 extern int stop_a_enabled; 384 385 void sun_do_break(void) 386 { 387 if (!stop_a_enabled) 388 return; 389 390 printk("\n"); 391 flush_user_windows(); 392 393 prom_cmdline(); 394 } 395 EXPORT_SYMBOL(sun_do_break); 396 397 int stop_a_enabled = 1; 398 399 static int __init topology_init(void) 400 { 401 int i, ncpus, err; 402 403 /* Count the number of physically present processors in 404 * the machine, even on uniprocessor, so that /proc/cpuinfo 405 * output is consistent with 2.4.x 406 */ 407 ncpus = 0; 408 while (!cpu_find_by_instance(ncpus, NULL, NULL)) 409 ncpus++; 410 ncpus_probed = ncpus; 411 412 err = 0; 413 for_each_online_cpu(i) { 414 struct cpu *p = kzalloc(sizeof(*p), GFP_KERNEL); 415 if (!p) 416 err = -ENOMEM; 417 else 418 register_cpu(p, i); 419 } 420 421 return err; 422 } 423 424 subsys_initcall(topology_init); 425