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/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 #include <uapi/linux/mount.h> 37 38 #include <asm/io.h> 39 #include <asm/processor.h> 40 #include <asm/oplib.h> 41 #include <asm/page.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 /* Typing sync at the prom prompt calls the function pointed to by 54 * romvec->pv_synchook which I set to the following function. 55 * This should sync all filesystems and return, for now it just 56 * prints out pretty messages and returns. 57 */ 58 59 /* Pretty sick eh? */ 60 static void prom_sync_me(void) 61 { 62 unsigned long prom_tbr, flags; 63 64 /* XXX Badly broken. FIX! - Anton */ 65 local_irq_save(flags); 66 __asm__ __volatile__("rd %%tbr, %0\n\t" : "=r" (prom_tbr)); 67 __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t" 68 "nop\n\t" 69 "nop\n\t" 70 "nop\n\t" : : "r" (&trapbase)); 71 72 prom_printf("PROM SYNC COMMAND...\n"); 73 show_mem(); 74 if (!is_idle_task(current)) { 75 local_irq_enable(); 76 ksys_sync(); 77 local_irq_disable(); 78 } 79 prom_printf("Returning to prom\n"); 80 81 __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t" 82 "nop\n\t" 83 "nop\n\t" 84 "nop\n\t" : : "r" (prom_tbr)); 85 local_irq_restore(flags); 86 } 87 88 static unsigned int boot_flags __initdata = 0; 89 #define BOOTME_DEBUG 0x1 90 91 /* Exported for mm/init.c:paging_init. */ 92 unsigned long cmdline_memory_size __initdata = 0; 93 94 /* which CPU booted us (0xff = not set) */ 95 unsigned char boot_cpu_id = 0xff; /* 0xff will make it into DATA section... */ 96 97 static void 98 prom_console_write(struct console *con, const char *s, unsigned int n) 99 { 100 prom_write(s, n); 101 } 102 103 static struct console prom_early_console = { 104 .name = "earlyprom", 105 .write = prom_console_write, 106 .flags = CON_PRINTBUFFER | CON_BOOT, 107 .index = -1, 108 }; 109 110 /* 111 * Process kernel command line switches that are specific to the 112 * SPARC or that require special low-level processing. 113 */ 114 static void __init process_switch(char c) 115 { 116 switch (c) { 117 case 'd': 118 boot_flags |= BOOTME_DEBUG; 119 break; 120 case 's': 121 break; 122 case 'h': 123 prom_printf("boot_flags_init: Halt!\n"); 124 prom_halt(); 125 break; 126 case 'p': 127 prom_early_console.flags &= ~CON_BOOT; 128 break; 129 default: 130 printk("Unknown boot switch (-%c)\n", c); 131 break; 132 } 133 } 134 135 static void __init boot_flags_init(char *commands) 136 { 137 while (*commands) { 138 /* Move to the start of the next "argument". */ 139 while (*commands == ' ') 140 commands++; 141 142 /* Process any command switches, otherwise skip it. */ 143 if (*commands == '\0') 144 break; 145 if (*commands == '-') { 146 commands++; 147 while (*commands && *commands != ' ') 148 process_switch(*commands++); 149 continue; 150 } 151 if (!strncmp(commands, "mem=", 4)) { 152 /* 153 * "mem=XXX[kKmM] overrides the PROM-reported 154 * memory size. 155 */ 156 cmdline_memory_size = simple_strtoul(commands + 4, 157 &commands, 0); 158 if (*commands == 'K' || *commands == 'k') { 159 cmdline_memory_size <<= 10; 160 commands++; 161 } else if (*commands=='M' || *commands=='m') { 162 cmdline_memory_size <<= 20; 163 commands++; 164 } 165 } 166 while (*commands && *commands != ' ') 167 commands++; 168 } 169 } 170 171 extern unsigned short root_flags; 172 extern unsigned short root_dev; 173 extern unsigned short ram_flags; 174 #define RAMDISK_IMAGE_START_MASK 0x07FF 175 #define RAMDISK_PROMPT_FLAG 0x8000 176 #define RAMDISK_LOAD_FLAG 0x4000 177 178 extern int root_mountflags; 179 180 char reboot_command[COMMAND_LINE_SIZE]; 181 182 struct cpuid_patch_entry { 183 unsigned int addr; 184 unsigned int sun4d[3]; 185 unsigned int leon[3]; 186 }; 187 extern struct cpuid_patch_entry __cpuid_patch, __cpuid_patch_end; 188 189 static void __init per_cpu_patch(void) 190 { 191 struct cpuid_patch_entry *p; 192 193 if (sparc_cpu_model == sun4m) { 194 /* Nothing to do, this is what the unpatched code 195 * targets. 196 */ 197 return; 198 } 199 200 p = &__cpuid_patch; 201 while (p < &__cpuid_patch_end) { 202 unsigned long addr = p->addr; 203 unsigned int *insns; 204 205 switch (sparc_cpu_model) { 206 case sun4d: 207 insns = &p->sun4d[0]; 208 break; 209 210 case sparc_leon: 211 insns = &p->leon[0]; 212 break; 213 default: 214 prom_printf("Unknown cpu type, halting.\n"); 215 prom_halt(); 216 } 217 *(unsigned int *) (addr + 0) = insns[0]; 218 flushi(addr + 0); 219 *(unsigned int *) (addr + 4) = insns[1]; 220 flushi(addr + 4); 221 *(unsigned int *) (addr + 8) = insns[2]; 222 flushi(addr + 8); 223 224 p++; 225 } 226 } 227 228 struct leon_1insn_patch_entry { 229 unsigned int addr; 230 unsigned int insn; 231 }; 232 233 enum sparc_cpu sparc_cpu_model; 234 EXPORT_SYMBOL(sparc_cpu_model); 235 236 static __init void leon_patch(void) 237 { 238 struct leon_1insn_patch_entry *start = (void *)__leon_1insn_patch; 239 struct leon_1insn_patch_entry *end = (void *)__leon_1insn_patch_end; 240 241 /* Default instruction is leon - no patching */ 242 if (sparc_cpu_model == sparc_leon) 243 return; 244 245 while (start < end) { 246 unsigned long addr = start->addr; 247 248 *(unsigned int *)(addr) = start->insn; 249 flushi(addr); 250 251 start++; 252 } 253 } 254 255 struct tt_entry *sparc_ttable; 256 257 /* Called from head_32.S - before we have setup anything 258 * in the kernel. Be very careful with what you do here. 259 */ 260 void __init sparc32_start_kernel(struct linux_romvec *rp) 261 { 262 prom_init(rp); 263 264 /* Set sparc_cpu_model */ 265 sparc_cpu_model = sun_unknown; 266 if (!strcmp(&cputypval[0], "sun4m")) 267 sparc_cpu_model = sun4m; 268 if (!strcmp(&cputypval[0], "sun4s")) 269 sparc_cpu_model = sun4m; /* CP-1200 with PROM 2.30 -E */ 270 if (!strcmp(&cputypval[0], "sun4d")) 271 sparc_cpu_model = sun4d; 272 if (!strcmp(&cputypval[0], "sun4e")) 273 sparc_cpu_model = sun4e; 274 if (!strcmp(&cputypval[0], "sun4u")) 275 sparc_cpu_model = sun4u; 276 if (!strncmp(&cputypval[0], "leon" , 4)) 277 sparc_cpu_model = sparc_leon; 278 279 leon_patch(); 280 start_kernel(); 281 } 282 283 void __init setup_arch(char **cmdline_p) 284 { 285 int i; 286 unsigned long highest_paddr; 287 288 sparc_ttable = &trapbase; 289 290 /* Initialize PROM console and command line. */ 291 *cmdline_p = prom_getbootargs(); 292 strscpy(boot_command_line, *cmdline_p, COMMAND_LINE_SIZE); 293 parse_early_param(); 294 295 boot_flags_init(*cmdline_p); 296 297 register_console(&prom_early_console); 298 299 switch(sparc_cpu_model) { 300 case sun4m: 301 pr_info("ARCH: SUN4M\n"); 302 break; 303 case sun4d: 304 pr_info("ARCH: SUN4D\n"); 305 break; 306 case sun4e: 307 pr_info("ARCH: SUN4E\n"); 308 break; 309 case sun4u: 310 pr_info("ARCH: SUN4U\n"); 311 break; 312 case sparc_leon: 313 pr_info("ARCH: LEON\n"); 314 break; 315 default: 316 pr_info("ARCH: UNKNOWN!\n"); 317 break; 318 } 319 320 idprom_init(); 321 load_mmu(); 322 323 phys_base = 0xffffffffUL; 324 highest_paddr = 0UL; 325 for (i = 0; sp_banks[i].num_bytes != 0; i++) { 326 unsigned long top; 327 328 if (sp_banks[i].base_addr < phys_base) 329 phys_base = sp_banks[i].base_addr; 330 top = sp_banks[i].base_addr + 331 sp_banks[i].num_bytes; 332 if (highest_paddr < top) 333 highest_paddr = top; 334 } 335 pfn_base = phys_base >> PAGE_SHIFT; 336 337 if (!root_flags) 338 root_mountflags &= ~MS_RDONLY; 339 ROOT_DEV = old_decode_dev(root_dev); 340 #ifdef CONFIG_BLK_DEV_RAM 341 rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK; 342 #endif 343 344 prom_setsync(prom_sync_me); 345 346 if((boot_flags & BOOTME_DEBUG) && (linux_dbvec != NULL) && 347 ((*(short *)linux_dbvec) != -1)) { 348 printk("Booted under KADB. Syncing trap table.\n"); 349 (*(linux_dbvec->teach_debugger))(); 350 } 351 352 /* Run-time patch instructions to match the cpu model */ 353 per_cpu_patch(); 354 355 paging_init(); 356 357 smp_setup_cpu_possible_map(); 358 } 359 360 extern int stop_a_enabled; 361 362 void sun_do_break(void) 363 { 364 if (!stop_a_enabled) 365 return; 366 367 printk("\n"); 368 flush_user_windows(); 369 370 prom_cmdline(); 371 } 372 EXPORT_SYMBOL(sun_do_break); 373 374 int stop_a_enabled = 1; 375 376 static int __init topology_init(void) 377 { 378 int i, ncpus, err; 379 380 /* Count the number of physically present processors in 381 * the machine, even on uniprocessor, so that /proc/cpuinfo 382 * output is consistent with 2.4.x 383 */ 384 ncpus = 0; 385 while (!cpu_find_by_instance(ncpus, NULL, NULL)) 386 ncpus++; 387 ncpus_probed = ncpus; 388 389 err = 0; 390 for_each_online_cpu(i) { 391 struct cpu *p = kzalloc(sizeof(*p), GFP_KERNEL); 392 if (!p) 393 err = -ENOMEM; 394 else 395 register_cpu(p, i); 396 } 397 398 return err; 399 } 400 401 subsys_initcall(topology_init); 402 403 #if defined(CONFIG_SPARC32) && !defined(CONFIG_SMP) 404 void __init arch_cpu_finalize_init(void) 405 { 406 cpu_data(0).udelay_val = loops_per_jiffy; 407 } 408 #endif 409