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/traps.h> 44 #include <asm/vaddrs.h> 45 #include <asm/mbus.h> 46 #include <asm/idprom.h> 47 #include <asm/cpudata.h> 48 #include <asm/setup.h> 49 #include <asm/cacheflush.h> 50 #include <asm/sections.h> 51 52 #include "kernel.h" 53 54 struct screen_info screen_info = { 55 0, 0, /* orig-x, orig-y */ 56 0, /* unused */ 57 0, /* orig-video-page */ 58 0, /* orig-video-mode */ 59 128, /* orig-video-cols */ 60 0,0,0, /* ega_ax, ega_bx, ega_cx */ 61 54, /* orig-video-lines */ 62 0, /* orig-video-isVGA */ 63 16 /* orig-video-points */ 64 }; 65 66 /* Typing sync at the prom prompt calls the function pointed to by 67 * romvec->pv_synchook which I set to the following function. 68 * This should sync all filesystems and return, for now it just 69 * prints out pretty messages and returns. 70 */ 71 72 /* Pretty sick eh? */ prom_sync_me(void)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_mem(); 87 if (!is_idle_task(current)) { 88 local_irq_enable(); 89 ksys_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... */ 109 110 static void prom_console_write(struct console * con,const char * s,unsigned int n)111 prom_console_write(struct console *con, const char *s, unsigned int 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 */ process_switch(char c)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 boot_flags_init(char * commands)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 == ' ') 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 extern unsigned short root_flags; 185 extern unsigned short root_dev; 186 extern unsigned short ram_flags; 187 #define RAMDISK_IMAGE_START_MASK 0x07FF 188 #define RAMDISK_PROMPT_FLAG 0x8000 189 #define RAMDISK_LOAD_FLAG 0x4000 190 191 extern int root_mountflags; 192 193 char reboot_command[COMMAND_LINE_SIZE]; 194 195 struct cpuid_patch_entry { 196 unsigned int addr; 197 unsigned int sun4d[3]; 198 unsigned int leon[3]; 199 }; 200 extern struct cpuid_patch_entry __cpuid_patch, __cpuid_patch_end; 201 per_cpu_patch(void)202 static void __init per_cpu_patch(void) 203 { 204 struct cpuid_patch_entry *p; 205 206 if (sparc_cpu_model == sun4m) { 207 /* Nothing to do, this is what the unpatched code 208 * targets. 209 */ 210 return; 211 } 212 213 p = &__cpuid_patch; 214 while (p < &__cpuid_patch_end) { 215 unsigned long addr = p->addr; 216 unsigned int *insns; 217 218 switch (sparc_cpu_model) { 219 case sun4d: 220 insns = &p->sun4d[0]; 221 break; 222 223 case sparc_leon: 224 insns = &p->leon[0]; 225 break; 226 default: 227 prom_printf("Unknown cpu type, halting.\n"); 228 prom_halt(); 229 } 230 *(unsigned int *) (addr + 0) = insns[0]; 231 flushi(addr + 0); 232 *(unsigned int *) (addr + 4) = insns[1]; 233 flushi(addr + 4); 234 *(unsigned int *) (addr + 8) = insns[2]; 235 flushi(addr + 8); 236 237 p++; 238 } 239 } 240 241 struct leon_1insn_patch_entry { 242 unsigned int addr; 243 unsigned int insn; 244 }; 245 246 enum sparc_cpu sparc_cpu_model; 247 EXPORT_SYMBOL(sparc_cpu_model); 248 leon_patch(void)249 static __init void leon_patch(void) 250 { 251 struct leon_1insn_patch_entry *start = (void *)__leon_1insn_patch; 252 struct leon_1insn_patch_entry *end = (void *)__leon_1insn_patch_end; 253 254 /* Default instruction is leon - no patching */ 255 if (sparc_cpu_model == sparc_leon) 256 return; 257 258 while (start < end) { 259 unsigned long addr = start->addr; 260 261 *(unsigned int *)(addr) = start->insn; 262 flushi(addr); 263 264 start++; 265 } 266 } 267 268 struct tt_entry *sparc_ttable; 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 */ sparc32_start_kernel(struct linux_romvec * rp)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 setup_arch(char ** cmdline_p)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 strscpy(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 switch(sparc_cpu_model) { 313 case sun4m: 314 pr_info("ARCH: SUN4M\n"); 315 break; 316 case sun4d: 317 pr_info("ARCH: SUN4D\n"); 318 break; 319 case sun4e: 320 pr_info("ARCH: SUN4E\n"); 321 break; 322 case sun4u: 323 pr_info("ARCH: SUN4U\n"); 324 break; 325 case sparc_leon: 326 pr_info("ARCH: LEON\n"); 327 break; 328 default: 329 pr_info("ARCH: UNKNOWN!\n"); 330 break; 331 } 332 333 idprom_init(); 334 load_mmu(); 335 336 phys_base = 0xffffffffUL; 337 highest_paddr = 0UL; 338 for (i = 0; sp_banks[i].num_bytes != 0; i++) { 339 unsigned long top; 340 341 if (sp_banks[i].base_addr < phys_base) 342 phys_base = sp_banks[i].base_addr; 343 top = sp_banks[i].base_addr + 344 sp_banks[i].num_bytes; 345 if (highest_paddr < top) 346 highest_paddr = top; 347 } 348 pfn_base = phys_base >> PAGE_SHIFT; 349 350 if (!root_flags) 351 root_mountflags &= ~MS_RDONLY; 352 ROOT_DEV = old_decode_dev(root_dev); 353 #ifdef CONFIG_BLK_DEV_RAM 354 rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK; 355 #endif 356 357 prom_setsync(prom_sync_me); 358 359 if((boot_flags & BOOTME_DEBUG) && (linux_dbvec != NULL) && 360 ((*(short *)linux_dbvec) != -1)) { 361 printk("Booted under KADB. Syncing trap table.\n"); 362 (*(linux_dbvec->teach_debugger))(); 363 } 364 365 /* Run-time patch instructions to match the cpu model */ 366 per_cpu_patch(); 367 368 paging_init(); 369 370 smp_setup_cpu_possible_map(); 371 } 372 373 extern int stop_a_enabled; 374 sun_do_break(void)375 void sun_do_break(void) 376 { 377 if (!stop_a_enabled) 378 return; 379 380 printk("\n"); 381 flush_user_windows(); 382 383 prom_cmdline(); 384 } 385 EXPORT_SYMBOL(sun_do_break); 386 387 int stop_a_enabled = 1; 388 topology_init(void)389 static int __init topology_init(void) 390 { 391 int i, ncpus, err; 392 393 /* Count the number of physically present processors in 394 * the machine, even on uniprocessor, so that /proc/cpuinfo 395 * output is consistent with 2.4.x 396 */ 397 ncpus = 0; 398 while (!cpu_find_by_instance(ncpus, NULL, NULL)) 399 ncpus++; 400 ncpus_probed = ncpus; 401 402 err = 0; 403 for_each_online_cpu(i) { 404 struct cpu *p = kzalloc(sizeof(*p), GFP_KERNEL); 405 if (!p) 406 err = -ENOMEM; 407 else 408 register_cpu(p, i); 409 } 410 411 return err; 412 } 413 414 subsys_initcall(topology_init); 415 416 #if defined(CONFIG_SPARC32) && !defined(CONFIG_SMP) arch_cpu_finalize_init(void)417 void __init arch_cpu_finalize_init(void) 418 { 419 cpu_data(0).udelay_val = loops_per_jiffy; 420 } 421 #endif 422