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 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 69 /* Pretty sick eh? */ 70 static void prom_sync_me(void) 71 { 72 unsigned long prom_tbr, flags; 73 74 /* XXX Badly broken. FIX! - Anton */ 75 local_irq_save(flags); 76 __asm__ __volatile__("rd %%tbr, %0\n\t" : "=r" (prom_tbr)); 77 __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t" 78 "nop\n\t" 79 "nop\n\t" 80 "nop\n\t" : : "r" (&trapbase)); 81 82 prom_printf("PROM SYNC COMMAND...\n"); 83 show_free_areas(); 84 if(current->pid != 0) { 85 local_irq_enable(); 86 sys_sync(); 87 local_irq_disable(); 88 } 89 prom_printf("Returning to prom\n"); 90 91 __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t" 92 "nop\n\t" 93 "nop\n\t" 94 "nop\n\t" : : "r" (prom_tbr)); 95 local_irq_restore(flags); 96 97 return; 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 extern unsigned long start, end; 189 190 extern unsigned short root_flags; 191 extern unsigned short root_dev; 192 extern unsigned short ram_flags; 193 #define RAMDISK_IMAGE_START_MASK 0x07FF 194 #define RAMDISK_PROMPT_FLAG 0x8000 195 #define RAMDISK_LOAD_FLAG 0x4000 196 197 extern int root_mountflags; 198 199 char reboot_command[COMMAND_LINE_SIZE]; 200 enum sparc_cpu 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 *) &start; 212 213 /* Initialize PROM console and command line. */ 214 *cmdline_p = prom_getbootargs(); 215 strcpy(boot_command_line, *cmdline_p); 216 217 /* Set sparc_cpu_model */ 218 sparc_cpu_model = sun_unknown; 219 if(!strcmp(&cputypval,"sun4 ")) { sparc_cpu_model=sun4; } 220 if(!strcmp(&cputypval,"sun4c")) { sparc_cpu_model=sun4c; } 221 if(!strcmp(&cputypval,"sun4m")) { sparc_cpu_model=sun4m; } 222 if(!strcmp(&cputypval,"sun4s")) { sparc_cpu_model=sun4m; } /* CP-1200 with PROM 2.30 -E */ 223 if(!strcmp(&cputypval,"sun4d")) { sparc_cpu_model=sun4d; } 224 if(!strcmp(&cputypval,"sun4e")) { sparc_cpu_model=sun4e; } 225 if(!strcmp(&cputypval,"sun4u")) { sparc_cpu_model=sun4u; } 226 227 #ifdef CONFIG_SUN4 228 if (sparc_cpu_model != sun4) { 229 prom_printf("This kernel is for Sun4 architecture only.\n"); 230 prom_halt(); 231 } 232 #endif 233 printk("ARCH: "); 234 switch(sparc_cpu_model) { 235 case sun4: 236 printk("SUN4\n"); 237 break; 238 case sun4c: 239 printk("SUN4C\n"); 240 break; 241 case sun4m: 242 printk("SUN4M\n"); 243 break; 244 case sun4d: 245 printk("SUN4D\n"); 246 break; 247 case sun4e: 248 printk("SUN4E\n"); 249 break; 250 case sun4u: 251 printk("SUN4U\n"); 252 break; 253 default: 254 printk("UNKNOWN!\n"); 255 break; 256 }; 257 258 #ifdef CONFIG_DUMMY_CONSOLE 259 conswitchp = &dummy_con; 260 #elif defined(CONFIG_PROM_CONSOLE) 261 conswitchp = &prom_con; 262 #endif 263 boot_flags_init(*cmdline_p); 264 265 idprom_init(); 266 if (ARCH_SUN4C_SUN4) 267 sun4c_probe_vac(); 268 load_mmu(); 269 270 phys_base = 0xffffffffUL; 271 highest_paddr = 0UL; 272 for (i = 0; sp_banks[i].num_bytes != 0; i++) { 273 unsigned long top; 274 275 if (sp_banks[i].base_addr < phys_base) 276 phys_base = sp_banks[i].base_addr; 277 top = sp_banks[i].base_addr + 278 sp_banks[i].num_bytes; 279 if (highest_paddr < top) 280 highest_paddr = top; 281 } 282 pfn_base = phys_base >> PAGE_SHIFT; 283 284 if (!root_flags) 285 root_mountflags &= ~MS_RDONLY; 286 ROOT_DEV = old_decode_dev(root_dev); 287 #ifdef CONFIG_BLK_DEV_RAM 288 rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK; 289 rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0); 290 rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0); 291 #endif 292 293 prom_setsync(prom_sync_me); 294 295 if((boot_flags&BOOTME_DEBUG) && (linux_dbvec!=0) && 296 ((*(short *)linux_dbvec) != -1)) { 297 printk("Booted under KADB. Syncing trap table.\n"); 298 (*(linux_dbvec->teach_debugger))(); 299 } 300 301 init_mm.context = (unsigned long) NO_CONTEXT; 302 init_task.thread.kregs = &fake_swapper_regs; 303 304 paging_init(); 305 306 smp_setup_cpu_possible_map(); 307 } 308 309 extern char *sparc_cpu_type; 310 extern char *sparc_fpu_type; 311 312 static int ncpus_probed; 313 314 static int show_cpuinfo(struct seq_file *m, void *__unused) 315 { 316 seq_printf(m, 317 "cpu\t\t: %s\n" 318 "fpu\t\t: %s\n" 319 "promlib\t\t: Version %d Revision %d\n" 320 "prom\t\t: %d.%d\n" 321 "type\t\t: %s\n" 322 "ncpus probed\t: %d\n" 323 "ncpus active\t: %d\n" 324 #ifndef CONFIG_SMP 325 "CPU0Bogo\t: %lu.%02lu\n" 326 "CPU0ClkTck\t: %ld\n" 327 #endif 328 , 329 sparc_cpu_type ? sparc_cpu_type : "undetermined", 330 sparc_fpu_type ? sparc_fpu_type : "undetermined", 331 romvec->pv_romvers, 332 prom_rev, 333 romvec->pv_printrev >> 16, 334 romvec->pv_printrev & 0xffff, 335 &cputypval, 336 ncpus_probed, 337 num_online_cpus() 338 #ifndef CONFIG_SMP 339 , cpu_data(0).udelay_val/(500000/HZ), 340 (cpu_data(0).udelay_val/(5000/HZ)) % 100, 341 cpu_data(0).clock_tick 342 #endif 343 ); 344 345 #ifdef CONFIG_SMP 346 smp_bogo(m); 347 #endif 348 mmu_info(m); 349 #ifdef CONFIG_SMP 350 smp_info(m); 351 #endif 352 return 0; 353 } 354 355 static void *c_start(struct seq_file *m, loff_t *pos) 356 { 357 /* The pointer we are returning is arbitrary, 358 * it just has to be non-NULL and not IS_ERR 359 * in the success case. 360 */ 361 return *pos == 0 ? &c_start : NULL; 362 } 363 364 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 365 { 366 ++*pos; 367 return c_start(m, pos); 368 } 369 370 static void c_stop(struct seq_file *m, void *v) 371 { 372 } 373 374 const struct seq_operations cpuinfo_op = { 375 .start =c_start, 376 .next = c_next, 377 .stop = c_stop, 378 .show = show_cpuinfo, 379 }; 380 381 extern int stop_a_enabled; 382 383 void sun_do_break(void) 384 { 385 if (!stop_a_enabled) 386 return; 387 388 printk("\n"); 389 flush_user_windows(); 390 391 prom_cmdline(); 392 } 393 394 int stop_a_enabled = 1; 395 396 static int __init topology_init(void) 397 { 398 int i, ncpus, err; 399 400 /* Count the number of physically present processors in 401 * the machine, even on uniprocessor, so that /proc/cpuinfo 402 * output is consistent with 2.4.x 403 */ 404 ncpus = 0; 405 while (!cpu_find_by_instance(ncpus, NULL, NULL)) 406 ncpus++; 407 ncpus_probed = ncpus; 408 409 err = 0; 410 for_each_online_cpu(i) { 411 struct cpu *p = kzalloc(sizeof(*p), GFP_KERNEL); 412 if (!p) 413 err = -ENOMEM; 414 else 415 register_cpu(p, i); 416 } 417 418 return err; 419 } 420 421 subsys_initcall(topology_init); 422