1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * linux/arch/sparc/kernel/setup.c 4 * 5 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) 6 * Copyright (C) 2000 Anton Blanchard (anton@samba.org) 7 */ 8 9 #include <linux/errno.h> 10 #include <linux/sched.h> 11 #include <linux/kernel.h> 12 #include <linux/mm.h> 13 #include <linux/stddef.h> 14 #include <linux/unistd.h> 15 #include <linux/ptrace.h> 16 #include <linux/slab.h> 17 #include <linux/initrd.h> 18 #include <asm/smp.h> 19 #include <linux/user.h> 20 #include <linux/screen_info.h> 21 #include <linux/delay.h> 22 #include <linux/fs.h> 23 #include <linux/seq_file.h> 24 #include <linux/syscalls.h> 25 #include <linux/kdev_t.h> 26 #include <linux/major.h> 27 #include <linux/string.h> 28 #include <linux/init.h> 29 #include <linux/interrupt.h> 30 #include <linux/console.h> 31 #include <linux/spinlock.h> 32 #include <linux/root_dev.h> 33 #include <linux/cpu.h> 34 #include <linux/kdebug.h> 35 #include <linux/export.h> 36 #include <linux/start_kernel.h> 37 #include <uapi/linux/mount.h> 38 39 #include <asm/io.h> 40 #include <asm/processor.h> 41 #include <asm/oplib.h> 42 #include <asm/page.h> 43 #include <asm/pgtable.h> 44 #include <asm/traps.h> 45 #include <asm/vaddrs.h> 46 #include <asm/mbus.h> 47 #include <asm/idprom.h> 48 #include <asm/cpudata.h> 49 #include <asm/setup.h> 50 #include <asm/cacheflush.h> 51 #include <asm/sections.h> 52 53 #include "kernel.h" 54 55 struct screen_info screen_info = { 56 0, 0, /* orig-x, orig-y */ 57 0, /* unused */ 58 0, /* orig-video-page */ 59 0, /* orig-video-mode */ 60 128, /* orig-video-cols */ 61 0,0,0, /* ega_ax, ega_bx, ega_cx */ 62 54, /* orig-video-lines */ 63 0, /* orig-video-isVGA */ 64 16 /* orig-video-points */ 65 }; 66 67 /* Typing sync at the prom prompt calls the function pointed to by 68 * romvec->pv_synchook which I set to the following function. 69 * This should sync all filesystems and return, for now it just 70 * prints out pretty messages and returns. 71 */ 72 73 /* Pretty sick eh? */ 74 static void prom_sync_me(void) 75 { 76 unsigned long prom_tbr, flags; 77 78 /* XXX Badly broken. FIX! - Anton */ 79 local_irq_save(flags); 80 __asm__ __volatile__("rd %%tbr, %0\n\t" : "=r" (prom_tbr)); 81 __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t" 82 "nop\n\t" 83 "nop\n\t" 84 "nop\n\t" : : "r" (&trapbase)); 85 86 prom_printf("PROM SYNC COMMAND...\n"); 87 show_free_areas(0, NULL); 88 if (!is_idle_task(current)) { 89 local_irq_enable(); 90 ksys_sync(); 91 local_irq_disable(); 92 } 93 prom_printf("Returning to prom\n"); 94 95 __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t" 96 "nop\n\t" 97 "nop\n\t" 98 "nop\n\t" : : "r" (prom_tbr)); 99 local_irq_restore(flags); 100 } 101 102 static unsigned int boot_flags __initdata = 0; 103 #define BOOTME_DEBUG 0x1 104 105 /* Exported for mm/init.c:paging_init. */ 106 unsigned long cmdline_memory_size __initdata = 0; 107 108 /* which CPU booted us (0xff = not set) */ 109 unsigned char boot_cpu_id = 0xff; /* 0xff will make it into DATA section... */ 110 111 static void 112 prom_console_write(struct console *con, const char *s, unsigned int 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 == ' ') 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 extern unsigned short root_flags; 186 extern unsigned short root_dev; 187 extern unsigned short ram_flags; 188 #define RAMDISK_IMAGE_START_MASK 0x07FF 189 #define RAMDISK_PROMPT_FLAG 0x8000 190 #define RAMDISK_LOAD_FLAG 0x4000 191 192 extern int root_mountflags; 193 194 char reboot_command[COMMAND_LINE_SIZE]; 195 196 struct cpuid_patch_entry { 197 unsigned int addr; 198 unsigned int sun4d[3]; 199 unsigned int leon[3]; 200 }; 201 extern struct cpuid_patch_entry __cpuid_patch, __cpuid_patch_end; 202 203 static void __init per_cpu_patch(void) 204 { 205 struct cpuid_patch_entry *p; 206 207 if (sparc_cpu_model == sun4m) { 208 /* Nothing to do, this is what the unpatched code 209 * targets. 210 */ 211 return; 212 } 213 214 p = &__cpuid_patch; 215 while (p < &__cpuid_patch_end) { 216 unsigned long addr = p->addr; 217 unsigned int *insns; 218 219 switch (sparc_cpu_model) { 220 case sun4d: 221 insns = &p->sun4d[0]; 222 break; 223 224 case sparc_leon: 225 insns = &p->leon[0]; 226 break; 227 default: 228 prom_printf("Unknown cpu type, halting.\n"); 229 prom_halt(); 230 } 231 *(unsigned int *) (addr + 0) = insns[0]; 232 flushi(addr + 0); 233 *(unsigned int *) (addr + 4) = insns[1]; 234 flushi(addr + 4); 235 *(unsigned int *) (addr + 8) = insns[2]; 236 flushi(addr + 8); 237 238 p++; 239 } 240 } 241 242 struct leon_1insn_patch_entry { 243 unsigned int addr; 244 unsigned int insn; 245 }; 246 247 enum sparc_cpu sparc_cpu_model; 248 EXPORT_SYMBOL(sparc_cpu_model); 249 250 static __init void leon_patch(void) 251 { 252 struct leon_1insn_patch_entry *start = (void *)__leon_1insn_patch; 253 struct leon_1insn_patch_entry *end = (void *)__leon_1insn_patch_end; 254 255 /* Default instruction is leon - no patching */ 256 if (sparc_cpu_model == sparc_leon) 257 return; 258 259 while (start < end) { 260 unsigned long addr = start->addr; 261 262 *(unsigned int *)(addr) = start->insn; 263 flushi(addr); 264 265 start++; 266 } 267 } 268 269 struct tt_entry *sparc_ttable; 270 static struct pt_regs fake_swapper_regs; 271 272 /* Called from head_32.S - before we have setup anything 273 * in the kernel. Be very careful with what you do here. 274 */ 275 void __init sparc32_start_kernel(struct linux_romvec *rp) 276 { 277 prom_init(rp); 278 279 /* Set sparc_cpu_model */ 280 sparc_cpu_model = sun_unknown; 281 if (!strcmp(&cputypval[0], "sun4m")) 282 sparc_cpu_model = sun4m; 283 if (!strcmp(&cputypval[0], "sun4s")) 284 sparc_cpu_model = sun4m; /* CP-1200 with PROM 2.30 -E */ 285 if (!strcmp(&cputypval[0], "sun4d")) 286 sparc_cpu_model = sun4d; 287 if (!strcmp(&cputypval[0], "sun4e")) 288 sparc_cpu_model = sun4e; 289 if (!strcmp(&cputypval[0], "sun4u")) 290 sparc_cpu_model = sun4u; 291 if (!strncmp(&cputypval[0], "leon" , 4)) 292 sparc_cpu_model = sparc_leon; 293 294 leon_patch(); 295 start_kernel(); 296 } 297 298 void __init setup_arch(char **cmdline_p) 299 { 300 int i; 301 unsigned long highest_paddr; 302 303 sparc_ttable = &trapbase; 304 305 /* Initialize PROM console and command line. */ 306 *cmdline_p = prom_getbootargs(); 307 strlcpy(boot_command_line, *cmdline_p, COMMAND_LINE_SIZE); 308 parse_early_param(); 309 310 boot_flags_init(*cmdline_p); 311 312 register_console(&prom_early_console); 313 314 switch(sparc_cpu_model) { 315 case sun4m: 316 pr_info("ARCH: SUN4M\n"); 317 break; 318 case sun4d: 319 pr_info("ARCH: SUN4D\n"); 320 break; 321 case sun4e: 322 pr_info("ARCH: SUN4E\n"); 323 break; 324 case sun4u: 325 pr_info("ARCH: SUN4U\n"); 326 break; 327 case sparc_leon: 328 pr_info("ARCH: LEON\n"); 329 break; 330 default: 331 pr_info("ARCH: UNKNOWN!\n"); 332 break; 333 } 334 335 #ifdef CONFIG_DUMMY_CONSOLE 336 conswitchp = &dummy_con; 337 #endif 338 339 idprom_init(); 340 load_mmu(); 341 342 phys_base = 0xffffffffUL; 343 highest_paddr = 0UL; 344 for (i = 0; sp_banks[i].num_bytes != 0; i++) { 345 unsigned long top; 346 347 if (sp_banks[i].base_addr < phys_base) 348 phys_base = sp_banks[i].base_addr; 349 top = sp_banks[i].base_addr + 350 sp_banks[i].num_bytes; 351 if (highest_paddr < top) 352 highest_paddr = top; 353 } 354 pfn_base = phys_base >> PAGE_SHIFT; 355 356 if (!root_flags) 357 root_mountflags &= ~MS_RDONLY; 358 ROOT_DEV = old_decode_dev(root_dev); 359 #ifdef CONFIG_BLK_DEV_RAM 360 rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK; 361 rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0); 362 rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0); 363 #endif 364 365 prom_setsync(prom_sync_me); 366 367 if((boot_flags & BOOTME_DEBUG) && (linux_dbvec != NULL) && 368 ((*(short *)linux_dbvec) != -1)) { 369 printk("Booted under KADB. Syncing trap table.\n"); 370 (*(linux_dbvec->teach_debugger))(); 371 } 372 373 init_task.thread.kregs = &fake_swapper_regs; 374 375 /* Run-time patch instructions to match the cpu model */ 376 per_cpu_patch(); 377 378 paging_init(); 379 380 smp_setup_cpu_possible_map(); 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