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 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 #include <asm/cacheflush.h> 49 50 #include "kernel.h" 51 52 struct screen_info screen_info = { 53 0, 0, /* orig-x, orig-y */ 54 0, /* unused */ 55 0, /* orig-video-page */ 56 0, /* orig-video-mode */ 57 128, /* orig-video-cols */ 58 0,0,0, /* ega_ax, ega_bx, ega_cx */ 59 54, /* orig-video-lines */ 60 0, /* orig-video-isVGA */ 61 16 /* orig-video-points */ 62 }; 63 64 /* Typing sync at the prom prompt calls the function pointed to by 65 * romvec->pv_synchook which I set to the following function. 66 * This should sync all filesystems and return, for now it just 67 * prints out pretty messages and returns. 68 */ 69 70 extern unsigned long trapbase; 71 72 /* Pretty sick eh? */ 73 static void prom_sync_me(void) 74 { 75 unsigned long prom_tbr, flags; 76 77 /* XXX Badly broken. FIX! - Anton */ 78 local_irq_save(flags); 79 __asm__ __volatile__("rd %%tbr, %0\n\t" : "=r" (prom_tbr)); 80 __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t" 81 "nop\n\t" 82 "nop\n\t" 83 "nop\n\t" : : "r" (&trapbase)); 84 85 prom_printf("PROM SYNC COMMAND...\n"); 86 show_free_areas(0); 87 if (!is_idle_task(current)) { 88 local_irq_enable(); 89 sys_sync(); 90 local_irq_disable(); 91 } 92 prom_printf("Returning to prom\n"); 93 94 __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t" 95 "nop\n\t" 96 "nop\n\t" 97 "nop\n\t" : : "r" (prom_tbr)); 98 local_irq_restore(flags); 99 } 100 101 static unsigned int boot_flags __initdata = 0; 102 #define BOOTME_DEBUG 0x1 103 104 /* Exported for mm/init.c:paging_init. */ 105 unsigned long cmdline_memory_size __initdata = 0; 106 107 /* which CPU booted us (0xff = not set) */ 108 unsigned char boot_cpu_id = 0xff; /* 0xff will make it into DATA section... */ 109 unsigned char boot_cpu_id4; /* boot_cpu_id << 2 */ 110 111 static void 112 prom_console_write(struct console *con, const char *s, unsigned n) 113 { 114 prom_write(s, n); 115 } 116 117 static struct console prom_early_console = { 118 .name = "earlyprom", 119 .write = prom_console_write, 120 .flags = CON_PRINTBUFFER | CON_BOOT, 121 .index = -1, 122 }; 123 124 /* 125 * Process kernel command line switches that are specific to the 126 * SPARC or that require special low-level processing. 127 */ 128 static void __init process_switch(char c) 129 { 130 switch (c) { 131 case 'd': 132 boot_flags |= BOOTME_DEBUG; 133 break; 134 case 's': 135 break; 136 case 'h': 137 prom_printf("boot_flags_init: Halt!\n"); 138 prom_halt(); 139 break; 140 case 'p': 141 prom_early_console.flags &= ~CON_BOOT; 142 break; 143 default: 144 printk("Unknown boot switch (-%c)\n", c); 145 break; 146 } 147 } 148 149 static void __init boot_flags_init(char *commands) 150 { 151 while (*commands) { 152 /* Move to the start of the next "argument". */ 153 while (*commands && *commands == ' ') 154 commands++; 155 156 /* Process any command switches, otherwise skip it. */ 157 if (*commands == '\0') 158 break; 159 if (*commands == '-') { 160 commands++; 161 while (*commands && *commands != ' ') 162 process_switch(*commands++); 163 continue; 164 } 165 if (!strncmp(commands, "mem=", 4)) { 166 /* 167 * "mem=XXX[kKmM] overrides the PROM-reported 168 * memory size. 169 */ 170 cmdline_memory_size = simple_strtoul(commands + 4, 171 &commands, 0); 172 if (*commands == 'K' || *commands == 'k') { 173 cmdline_memory_size <<= 10; 174 commands++; 175 } else if (*commands=='M' || *commands=='m') { 176 cmdline_memory_size <<= 20; 177 commands++; 178 } 179 } 180 while (*commands && *commands != ' ') 181 commands++; 182 } 183 } 184 185 /* This routine will in the future do all the nasty prom stuff 186 * to probe for the mmu type and its parameters, etc. This will 187 * also be where SMP things happen. 188 */ 189 190 extern void sun4c_probe_vac(void); 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]; 202 203 enum sparc_cpu sparc_cpu_model; 204 EXPORT_SYMBOL(sparc_cpu_model); 205 206 struct tt_entry *sparc_ttable; 207 208 struct pt_regs fake_swapper_regs; 209 210 void __init setup_arch(char **cmdline_p) 211 { 212 int i; 213 unsigned long highest_paddr; 214 215 sparc_ttable = (struct tt_entry *) &trapbase; 216 217 /* Initialize PROM console and command line. */ 218 *cmdline_p = prom_getbootargs(); 219 strcpy(boot_command_line, *cmdline_p); 220 parse_early_param(); 221 222 boot_flags_init(*cmdline_p); 223 224 register_console(&prom_early_console); 225 226 /* Set sparc_cpu_model */ 227 sparc_cpu_model = sun_unknown; 228 if (!strcmp(&cputypval[0], "sun4 ")) 229 sparc_cpu_model = sun4; 230 if (!strcmp(&cputypval[0], "sun4c")) 231 sparc_cpu_model = sun4c; 232 if (!strcmp(&cputypval[0], "sun4m")) 233 sparc_cpu_model = sun4m; 234 if (!strcmp(&cputypval[0], "sun4s")) 235 sparc_cpu_model = sun4m; /* CP-1200 with PROM 2.30 -E */ 236 if (!strcmp(&cputypval[0], "sun4d")) 237 sparc_cpu_model = sun4d; 238 if (!strcmp(&cputypval[0], "sun4e")) 239 sparc_cpu_model = sun4e; 240 if (!strcmp(&cputypval[0], "sun4u")) 241 sparc_cpu_model = sun4u; 242 if (!strncmp(&cputypval[0], "leon" , 4)) 243 sparc_cpu_model = sparc_leon; 244 245 printk("ARCH: "); 246 switch(sparc_cpu_model) { 247 case sun4: 248 printk("SUN4\n"); 249 break; 250 case sun4c: 251 printk("SUN4C\n"); 252 break; 253 case sun4m: 254 printk("SUN4M\n"); 255 break; 256 case sun4d: 257 printk("SUN4D\n"); 258 break; 259 case sun4e: 260 printk("SUN4E\n"); 261 break; 262 case sun4u: 263 printk("SUN4U\n"); 264 break; 265 case sparc_leon: 266 printk("LEON\n"); 267 break; 268 default: 269 printk("UNKNOWN!\n"); 270 break; 271 } 272 273 #ifdef CONFIG_DUMMY_CONSOLE 274 conswitchp = &dummy_con; 275 #endif 276 277 idprom_init(); 278 if (ARCH_SUN4C) 279 sun4c_probe_vac(); 280 load_mmu(); 281 282 phys_base = 0xffffffffUL; 283 highest_paddr = 0UL; 284 for (i = 0; sp_banks[i].num_bytes != 0; i++) { 285 unsigned long top; 286 287 if (sp_banks[i].base_addr < phys_base) 288 phys_base = sp_banks[i].base_addr; 289 top = sp_banks[i].base_addr + 290 sp_banks[i].num_bytes; 291 if (highest_paddr < top) 292 highest_paddr = top; 293 } 294 pfn_base = phys_base >> PAGE_SHIFT; 295 296 if (!root_flags) 297 root_mountflags &= ~MS_RDONLY; 298 ROOT_DEV = old_decode_dev(root_dev); 299 #ifdef CONFIG_BLK_DEV_RAM 300 rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK; 301 rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0); 302 rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0); 303 #endif 304 305 prom_setsync(prom_sync_me); 306 307 if((boot_flags&BOOTME_DEBUG) && (linux_dbvec!=0) && 308 ((*(short *)linux_dbvec) != -1)) { 309 printk("Booted under KADB. Syncing trap table.\n"); 310 (*(linux_dbvec->teach_debugger))(); 311 } 312 313 init_mm.context = (unsigned long) NO_CONTEXT; 314 init_task.thread.kregs = &fake_swapper_regs; 315 316 paging_init(); 317 318 smp_setup_cpu_possible_map(); 319 } 320 321 extern int stop_a_enabled; 322 323 void sun_do_break(void) 324 { 325 if (!stop_a_enabled) 326 return; 327 328 printk("\n"); 329 flush_user_windows(); 330 331 prom_cmdline(); 332 } 333 EXPORT_SYMBOL(sun_do_break); 334 335 int stop_a_enabled = 1; 336 337 static int __init topology_init(void) 338 { 339 int i, ncpus, err; 340 341 /* Count the number of physically present processors in 342 * the machine, even on uniprocessor, so that /proc/cpuinfo 343 * output is consistent with 2.4.x 344 */ 345 ncpus = 0; 346 while (!cpu_find_by_instance(ncpus, NULL, NULL)) 347 ncpus++; 348 ncpus_probed = ncpus; 349 350 err = 0; 351 for_each_online_cpu(i) { 352 struct cpu *p = kzalloc(sizeof(*p), GFP_KERNEL); 353 if (!p) 354 err = -ENOMEM; 355 else 356 register_cpu(p, i); 357 } 358 359 return err; 360 } 361 362 subsys_initcall(topology_init); 363