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(0); 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 /* which CPU booted us (0xff = not set) */ 107 unsigned char boot_cpu_id = 0xff; /* 0xff will make it into DATA section... */ 108 unsigned char boot_cpu_id4; /* boot_cpu_id << 2 */ 109 110 static void 111 prom_console_write(struct console *con, const char *s, unsigned n) 112 { 113 prom_write(s, n); 114 } 115 116 static struct console prom_early_console = { 117 .name = "earlyprom", 118 .write = prom_console_write, 119 .flags = CON_PRINTBUFFER | CON_BOOT, 120 .index = -1, 121 }; 122 123 /* 124 * Process kernel command line switches that are specific to the 125 * SPARC or that require special low-level processing. 126 */ 127 static void __init process_switch(char c) 128 { 129 switch (c) { 130 case 'd': 131 boot_flags |= BOOTME_DEBUG; 132 break; 133 case 's': 134 break; 135 case 'h': 136 prom_printf("boot_flags_init: Halt!\n"); 137 prom_halt(); 138 break; 139 case 'p': 140 prom_early_console.flags &= ~CON_BOOT; 141 break; 142 default: 143 printk("Unknown boot switch (-%c)\n", c); 144 break; 145 } 146 } 147 148 static void __init boot_flags_init(char *commands) 149 { 150 while (*commands) { 151 /* Move to the start of the next "argument". */ 152 while (*commands && *commands == ' ') 153 commands++; 154 155 /* Process any command switches, otherwise skip it. */ 156 if (*commands == '\0') 157 break; 158 if (*commands == '-') { 159 commands++; 160 while (*commands && *commands != ' ') 161 process_switch(*commands++); 162 continue; 163 } 164 if (!strncmp(commands, "mem=", 4)) { 165 /* 166 * "mem=XXX[kKmM] overrides the PROM-reported 167 * memory size. 168 */ 169 cmdline_memory_size = simple_strtoul(commands + 4, 170 &commands, 0); 171 if (*commands == 'K' || *commands == 'k') { 172 cmdline_memory_size <<= 10; 173 commands++; 174 } else if (*commands=='M' || *commands=='m') { 175 cmdline_memory_size <<= 20; 176 commands++; 177 } 178 } 179 while (*commands && *commands != ' ') 180 commands++; 181 } 182 } 183 184 /* This routine will in the future do all the nasty prom stuff 185 * to probe for the mmu type and its parameters, etc. This will 186 * also be where SMP things happen. 187 */ 188 189 extern void sun4c_probe_vac(void); 190 191 extern unsigned short root_flags; 192 extern unsigned short root_dev; 193 extern unsigned short ram_flags; 194 #define RAMDISK_IMAGE_START_MASK 0x07FF 195 #define RAMDISK_PROMPT_FLAG 0x8000 196 #define RAMDISK_LOAD_FLAG 0x4000 197 198 extern int root_mountflags; 199 200 char reboot_command[COMMAND_LINE_SIZE]; 201 202 enum sparc_cpu sparc_cpu_model; 203 EXPORT_SYMBOL(sparc_cpu_model); 204 205 struct tt_entry *sparc_ttable; 206 207 struct pt_regs fake_swapper_regs; 208 209 void __init setup_arch(char **cmdline_p) 210 { 211 int i; 212 unsigned long highest_paddr; 213 214 sparc_ttable = (struct tt_entry *) &trapbase; 215 216 /* Initialize PROM console and command line. */ 217 *cmdline_p = prom_getbootargs(); 218 strcpy(boot_command_line, *cmdline_p); 219 parse_early_param(); 220 221 boot_flags_init(*cmdline_p); 222 223 register_console(&prom_early_console); 224 225 /* Set sparc_cpu_model */ 226 sparc_cpu_model = sun_unknown; 227 if (!strcmp(&cputypval[0], "sun4 ")) 228 sparc_cpu_model = sun4; 229 if (!strcmp(&cputypval[0], "sun4c")) 230 sparc_cpu_model = sun4c; 231 if (!strcmp(&cputypval[0], "sun4m")) 232 sparc_cpu_model = sun4m; 233 if (!strcmp(&cputypval[0], "sun4s")) 234 sparc_cpu_model = sun4m; /* CP-1200 with PROM 2.30 -E */ 235 if (!strcmp(&cputypval[0], "sun4d")) 236 sparc_cpu_model = sun4d; 237 if (!strcmp(&cputypval[0], "sun4e")) 238 sparc_cpu_model = sun4e; 239 if (!strcmp(&cputypval[0], "sun4u")) 240 sparc_cpu_model = sun4u; 241 if (!strncmp(&cputypval[0], "leon" , 4)) 242 sparc_cpu_model = sparc_leon; 243 244 printk("ARCH: "); 245 switch(sparc_cpu_model) { 246 case sun4: 247 printk("SUN4\n"); 248 break; 249 case sun4c: 250 printk("SUN4C\n"); 251 break; 252 case sun4m: 253 printk("SUN4M\n"); 254 break; 255 case sun4d: 256 printk("SUN4D\n"); 257 break; 258 case sun4e: 259 printk("SUN4E\n"); 260 break; 261 case sun4u: 262 printk("SUN4U\n"); 263 break; 264 case sparc_leon: 265 printk("LEON\n"); 266 break; 267 default: 268 printk("UNKNOWN!\n"); 269 break; 270 } 271 272 #ifdef CONFIG_DUMMY_CONSOLE 273 conswitchp = &dummy_con; 274 #endif 275 276 idprom_init(); 277 if (ARCH_SUN4C) 278 sun4c_probe_vac(); 279 load_mmu(); 280 281 phys_base = 0xffffffffUL; 282 highest_paddr = 0UL; 283 for (i = 0; sp_banks[i].num_bytes != 0; i++) { 284 unsigned long top; 285 286 if (sp_banks[i].base_addr < phys_base) 287 phys_base = sp_banks[i].base_addr; 288 top = sp_banks[i].base_addr + 289 sp_banks[i].num_bytes; 290 if (highest_paddr < top) 291 highest_paddr = top; 292 } 293 pfn_base = phys_base >> PAGE_SHIFT; 294 295 if (!root_flags) 296 root_mountflags &= ~MS_RDONLY; 297 ROOT_DEV = old_decode_dev(root_dev); 298 #ifdef CONFIG_BLK_DEV_RAM 299 rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK; 300 rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0); 301 rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0); 302 #endif 303 304 prom_setsync(prom_sync_me); 305 306 if((boot_flags&BOOTME_DEBUG) && (linux_dbvec!=0) && 307 ((*(short *)linux_dbvec) != -1)) { 308 printk("Booted under KADB. Syncing trap table.\n"); 309 (*(linux_dbvec->teach_debugger))(); 310 } 311 312 init_mm.context = (unsigned long) NO_CONTEXT; 313 init_task.thread.kregs = &fake_swapper_regs; 314 315 paging_init(); 316 317 smp_setup_cpu_possible_map(); 318 } 319 320 extern int stop_a_enabled; 321 322 void sun_do_break(void) 323 { 324 if (!stop_a_enabled) 325 return; 326 327 printk("\n"); 328 flush_user_windows(); 329 330 prom_cmdline(); 331 } 332 EXPORT_SYMBOL(sun_do_break); 333 334 int stop_a_enabled = 1; 335 336 static int __init topology_init(void) 337 { 338 int i, ncpus, err; 339 340 /* Count the number of physically present processors in 341 * the machine, even on uniprocessor, so that /proc/cpuinfo 342 * output is consistent with 2.4.x 343 */ 344 ncpus = 0; 345 while (!cpu_find_by_instance(ncpus, NULL, NULL)) 346 ncpus++; 347 ncpus_probed = ncpus; 348 349 err = 0; 350 for_each_online_cpu(i) { 351 struct cpu *p = kzalloc(sizeof(*p), GFP_KERNEL); 352 if (!p) 353 err = -ENOMEM; 354 else 355 register_cpu(p, i); 356 } 357 358 return err; 359 } 360 361 subsys_initcall(topology_init); 362