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 #include <linux/export.h> 35 #include <linux/start_kernel.h> 36 37 #include <asm/io.h> 38 #include <asm/processor.h> 39 #include <asm/oplib.h> 40 #include <asm/page.h> 41 #include <asm/pgtable.h> 42 #include <asm/traps.h> 43 #include <asm/vaddrs.h> 44 #include <asm/mbus.h> 45 #include <asm/idprom.h> 46 #include <asm/cpudata.h> 47 #include <asm/setup.h> 48 #include <asm/cacheflush.h> 49 #include <asm/sections.h> 50 51 #include "kernel.h" 52 53 struct screen_info screen_info = { 54 0, 0, /* orig-x, orig-y */ 55 0, /* unused */ 56 0, /* orig-video-page */ 57 0, /* orig-video-mode */ 58 128, /* orig-video-cols */ 59 0,0,0, /* ega_ax, ega_bx, ega_cx */ 60 54, /* orig-video-lines */ 61 0, /* orig-video-isVGA */ 62 16 /* orig-video-points */ 63 }; 64 65 /* Typing sync at the prom prompt calls the function pointed to by 66 * romvec->pv_synchook which I set to the following function. 67 * This should sync all filesystems and return, for now it just 68 * prints out pretty messages and returns. 69 */ 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(0); 86 if (!is_idle_task(current)) { 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 /* which CPU booted us (0xff = not set) */ 107 unsigned char boot_cpu_id = 0xff; /* 0xff will make it into DATA section... */ 108 109 static void 110 prom_console_write(struct console *con, const char *s, unsigned int n) 111 { 112 prom_write(s, n); 113 } 114 115 static struct console prom_early_console = { 116 .name = "earlyprom", 117 .write = prom_console_write, 118 .flags = CON_PRINTBUFFER | CON_BOOT, 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 prom_early_console.flags &= ~CON_BOOT; 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 extern unsigned short root_flags; 184 extern unsigned short root_dev; 185 extern unsigned short ram_flags; 186 #define RAMDISK_IMAGE_START_MASK 0x07FF 187 #define RAMDISK_PROMPT_FLAG 0x8000 188 #define RAMDISK_LOAD_FLAG 0x4000 189 190 extern int root_mountflags; 191 192 char reboot_command[COMMAND_LINE_SIZE]; 193 194 struct cpuid_patch_entry { 195 unsigned int addr; 196 unsigned int sun4d[3]; 197 unsigned int leon[3]; 198 }; 199 extern struct cpuid_patch_entry __cpuid_patch, __cpuid_patch_end; 200 201 static void __init per_cpu_patch(void) 202 { 203 struct cpuid_patch_entry *p; 204 205 if (sparc_cpu_model == sun4m) { 206 /* Nothing to do, this is what the unpatched code 207 * targets. 208 */ 209 return; 210 } 211 212 p = &__cpuid_patch; 213 while (p < &__cpuid_patch_end) { 214 unsigned long addr = p->addr; 215 unsigned int *insns; 216 217 switch (sparc_cpu_model) { 218 case sun4d: 219 insns = &p->sun4d[0]; 220 break; 221 222 case sparc_leon: 223 insns = &p->leon[0]; 224 break; 225 default: 226 prom_printf("Unknown cpu type, halting.\n"); 227 prom_halt(); 228 } 229 *(unsigned int *) (addr + 0) = insns[0]; 230 flushi(addr + 0); 231 *(unsigned int *) (addr + 4) = insns[1]; 232 flushi(addr + 4); 233 *(unsigned int *) (addr + 8) = insns[2]; 234 flushi(addr + 8); 235 236 p++; 237 } 238 } 239 240 struct leon_1insn_patch_entry { 241 unsigned int addr; 242 unsigned int insn; 243 }; 244 245 enum sparc_cpu sparc_cpu_model; 246 EXPORT_SYMBOL(sparc_cpu_model); 247 248 static __init void leon_patch(void) 249 { 250 struct leon_1insn_patch_entry *start = (void *)__leon_1insn_patch; 251 struct leon_1insn_patch_entry *end = (void *)__leon_1insn_patch_end; 252 253 /* Default instruction is leon - no patching */ 254 if (sparc_cpu_model == sparc_leon) 255 return; 256 257 while (start < end) { 258 unsigned long addr = start->addr; 259 260 *(unsigned int *)(addr) = start->insn; 261 flushi(addr); 262 263 start++; 264 } 265 } 266 267 struct tt_entry *sparc_ttable; 268 static struct pt_regs fake_swapper_regs; 269 270 /* Called from head_32.S - before we have setup anything 271 * in the kernel. Be very careful with what you do here. 272 */ 273 void __init sparc32_start_kernel(struct linux_romvec *rp) 274 { 275 prom_init(rp); 276 277 /* Set sparc_cpu_model */ 278 sparc_cpu_model = sun_unknown; 279 if (!strcmp(&cputypval[0], "sun4m")) 280 sparc_cpu_model = sun4m; 281 if (!strcmp(&cputypval[0], "sun4s")) 282 sparc_cpu_model = sun4m; /* CP-1200 with PROM 2.30 -E */ 283 if (!strcmp(&cputypval[0], "sun4d")) 284 sparc_cpu_model = sun4d; 285 if (!strcmp(&cputypval[0], "sun4e")) 286 sparc_cpu_model = sun4e; 287 if (!strcmp(&cputypval[0], "sun4u")) 288 sparc_cpu_model = sun4u; 289 if (!strncmp(&cputypval[0], "leon" , 4)) 290 sparc_cpu_model = sparc_leon; 291 292 leon_patch(); 293 start_kernel(); 294 } 295 296 void __init setup_arch(char **cmdline_p) 297 { 298 int i; 299 unsigned long highest_paddr; 300 301 sparc_ttable = &trapbase; 302 303 /* Initialize PROM console and command line. */ 304 *cmdline_p = prom_getbootargs(); 305 strlcpy(boot_command_line, *cmdline_p, COMMAND_LINE_SIZE); 306 parse_early_param(); 307 308 boot_flags_init(*cmdline_p); 309 310 register_console(&prom_early_console); 311 312 printk("ARCH: "); 313 switch(sparc_cpu_model) { 314 case sun4m: 315 printk("SUN4M\n"); 316 break; 317 case sun4d: 318 printk("SUN4D\n"); 319 break; 320 case sun4e: 321 printk("SUN4E\n"); 322 break; 323 case sun4u: 324 printk("SUN4U\n"); 325 break; 326 case sparc_leon: 327 printk("LEON\n"); 328 break; 329 default: 330 printk("UNKNOWN!\n"); 331 break; 332 } 333 334 #ifdef CONFIG_DUMMY_CONSOLE 335 conswitchp = &dummy_con; 336 #endif 337 338 idprom_init(); 339 load_mmu(); 340 341 phys_base = 0xffffffffUL; 342 highest_paddr = 0UL; 343 for (i = 0; sp_banks[i].num_bytes != 0; i++) { 344 unsigned long top; 345 346 if (sp_banks[i].base_addr < phys_base) 347 phys_base = sp_banks[i].base_addr; 348 top = sp_banks[i].base_addr + 349 sp_banks[i].num_bytes; 350 if (highest_paddr < top) 351 highest_paddr = top; 352 } 353 pfn_base = phys_base >> PAGE_SHIFT; 354 355 if (!root_flags) 356 root_mountflags &= ~MS_RDONLY; 357 ROOT_DEV = old_decode_dev(root_dev); 358 #ifdef CONFIG_BLK_DEV_RAM 359 rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK; 360 rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0); 361 rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0); 362 #endif 363 364 prom_setsync(prom_sync_me); 365 366 if((boot_flags & BOOTME_DEBUG) && (linux_dbvec != NULL) && 367 ((*(short *)linux_dbvec) != -1)) { 368 printk("Booted under KADB. Syncing trap table.\n"); 369 (*(linux_dbvec->teach_debugger))(); 370 } 371 372 init_task.thread.kregs = &fake_swapper_regs; 373 374 /* Run-time patch instructions to match the cpu model */ 375 per_cpu_patch(); 376 377 paging_init(); 378 379 smp_setup_cpu_possible_map(); 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 EXPORT_SYMBOL(sun_do_break); 395 396 int stop_a_enabled = 1; 397 398 static int __init topology_init(void) 399 { 400 int i, ncpus, err; 401 402 /* Count the number of physically present processors in 403 * the machine, even on uniprocessor, so that /proc/cpuinfo 404 * output is consistent with 2.4.x 405 */ 406 ncpus = 0; 407 while (!cpu_find_by_instance(ncpus, NULL, NULL)) 408 ncpus++; 409 ncpus_probed = ncpus; 410 411 err = 0; 412 for_each_online_cpu(i) { 413 struct cpu *p = kzalloc(sizeof(*p), GFP_KERNEL); 414 if (!p) 415 err = -ENOMEM; 416 else 417 register_cpu(p, i); 418 } 419 420 return err; 421 } 422 423 subsys_initcall(topology_init); 424