/arch/xtensa/kernel/setup.c
C | 481 lines | 346 code | 88 blank | 47 comment | 26 complexity | e25be0b36c68479876ce19073b9d1630 MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
1/* 2 * arch/xtensa/kernel/setup.c 3 * 4 * This file is subject to the terms and conditions of the GNU General Public 5 * License. See the file "COPYING" in the main directory of this archive 6 * for more details. 7 * 8 * Copyright (C) 1995 Linus Torvalds 9 * Copyright (C) 2001 - 2005 Tensilica Inc. 10 * 11 * Chris Zankel <chris@zankel.net> 12 * Joe Taylor <joe@tensilica.com, joetylr@yahoo.com> 13 * Kevin Chea 14 * Marc Gauthier<marc@tensilica.com> <marc@alumni.uwaterloo.ca> 15 */ 16 17#include <linux/errno.h> 18#include <linux/init.h> 19#include <linux/mm.h> 20#include <linux/proc_fs.h> 21#include <linux/screen_info.h> 22#include <linux/bootmem.h> 23#include <linux/kernel.h> 24 25#if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE) 26# include <linux/console.h> 27#endif 28 29#ifdef CONFIG_RTC 30# include <linux/timex.h> 31#endif 32 33#ifdef CONFIG_PROC_FS 34# include <linux/seq_file.h> 35#endif 36 37#include <asm/system.h> 38#include <asm/bootparam.h> 39#include <asm/pgtable.h> 40#include <asm/processor.h> 41#include <asm/timex.h> 42#include <asm/platform.h> 43#include <asm/page.h> 44#include <asm/setup.h> 45#include <asm/param.h> 46 47#include <platform/hardware.h> 48 49#if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE) 50struct screen_info screen_info = { 0, 24, 0, 0, 0, 80, 0, 0, 0, 24, 1, 16}; 51#endif 52 53#ifdef CONFIG_BLK_DEV_FD 54extern struct fd_ops no_fd_ops; 55struct fd_ops *fd_ops; 56#endif 57 58extern struct rtc_ops no_rtc_ops; 59struct rtc_ops *rtc_ops; 60 61#ifdef CONFIG_BLK_DEV_INITRD 62extern void *initrd_start; 63extern void *initrd_end; 64extern void *__initrd_start; 65extern void *__initrd_end; 66int initrd_is_mapped = 0; 67extern int initrd_below_start_ok; 68#endif 69 70unsigned char aux_device_present; 71extern unsigned long loops_per_jiffy; 72 73/* Command line specified as configuration option. */ 74 75static char __initdata command_line[COMMAND_LINE_SIZE]; 76 77#ifdef CONFIG_CMDLINE_BOOL 78static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE; 79#endif 80 81sysmem_info_t __initdata sysmem; 82 83#ifdef CONFIG_BLK_DEV_INITRD 84int initrd_is_mapped; 85#endif 86 87#ifdef CONFIG_MMU 88extern void init_mmu(void); 89#else 90static inline void init_mmu(void) { } 91#endif 92 93extern void zones_init(void); 94 95/* 96 * Boot parameter parsing. 97 * 98 * The Xtensa port uses a list of variable-sized tags to pass data to 99 * the kernel. The first tag must be a BP_TAG_FIRST tag for the list 100 * to be recognised. The list is terminated with a zero-sized 101 * BP_TAG_LAST tag. 102 */ 103 104typedef struct tagtable { 105 u32 tag; 106 int (*parse)(const bp_tag_t*); 107} tagtable_t; 108 109#define __tagtable(tag, fn) static tagtable_t __tagtable_##fn \ 110 __attribute__((unused, __section__(".taglist"))) = { tag, fn } 111 112/* parse current tag */ 113 114static int __init parse_tag_mem(const bp_tag_t *tag) 115{ 116 meminfo_t *mi = (meminfo_t*)(tag->data); 117 118 if (mi->type != MEMORY_TYPE_CONVENTIONAL) 119 return -1; 120 121 if (sysmem.nr_banks >= SYSMEM_BANKS_MAX) { 122 printk(KERN_WARNING 123 "Ignoring memory bank 0x%08lx size %ldKB\n", 124 (unsigned long)mi->start, 125 (unsigned long)mi->end - (unsigned long)mi->start); 126 return -EINVAL; 127 } 128 sysmem.bank[sysmem.nr_banks].type = mi->type; 129 sysmem.bank[sysmem.nr_banks].start = PAGE_ALIGN(mi->start); 130 sysmem.bank[sysmem.nr_banks].end = mi->end & PAGE_SIZE; 131 sysmem.nr_banks++; 132 133 return 0; 134} 135 136__tagtable(BP_TAG_MEMORY, parse_tag_mem); 137 138#ifdef CONFIG_BLK_DEV_INITRD 139 140static int __init parse_tag_initrd(const bp_tag_t* tag) 141{ 142 meminfo_t* mi; 143 mi = (meminfo_t*)(tag->data); 144 initrd_start = (void*)(mi->start); 145 initrd_end = (void*)(mi->end); 146 147 return 0; 148} 149 150__tagtable(BP_TAG_INITRD, parse_tag_initrd); 151 152#endif /* CONFIG_BLK_DEV_INITRD */ 153 154static int __init parse_tag_cmdline(const bp_tag_t* tag) 155{ 156 strncpy(command_line, (char*)(tag->data), COMMAND_LINE_SIZE); 157 command_line[COMMAND_LINE_SIZE - 1] = '\0'; 158 return 0; 159} 160 161__tagtable(BP_TAG_COMMAND_LINE, parse_tag_cmdline); 162 163static int __init parse_bootparam(const bp_tag_t* tag) 164{ 165 extern tagtable_t __tagtable_begin, __tagtable_end; 166 tagtable_t *t; 167 168 /* Boot parameters must start with a BP_TAG_FIRST tag. */ 169 170 if (tag->id != BP_TAG_FIRST) { 171 printk(KERN_WARNING "Invalid boot parameters!\n"); 172 return 0; 173 } 174 175 tag = (bp_tag_t*)((unsigned long)tag + sizeof(bp_tag_t) + tag->size); 176 177 /* Parse all tags. */ 178 179 while (tag != NULL && tag->id != BP_TAG_LAST) { 180 for (t = &__tagtable_begin; t < &__tagtable_end; t++) { 181 if (tag->id == t->tag) { 182 t->parse(tag); 183 break; 184 } 185 } 186 if (t == &__tagtable_end) 187 printk(KERN_WARNING "Ignoring tag " 188 "0x%08x\n", tag->id); 189 tag = (bp_tag_t*)((unsigned long)(tag + 1) + tag->size); 190 } 191 192 return 0; 193} 194 195/* 196 * Initialize architecture. (Early stage) 197 */ 198 199void __init init_arch(bp_tag_t *bp_start) 200{ 201 202#ifdef CONFIG_BLK_DEV_INITRD 203 initrd_start = &__initrd_start; 204 initrd_end = &__initrd_end; 205#endif 206 207 sysmem.nr_banks = 0; 208 209#ifdef CONFIG_CMDLINE_BOOL 210 strcpy(command_line, default_command_line); 211#endif 212 213 /* Parse boot parameters */ 214 215 if (bp_start) 216 parse_bootparam(bp_start); 217 218 if (sysmem.nr_banks == 0) { 219 sysmem.nr_banks = 1; 220 sysmem.bank[0].start = PLATFORM_DEFAULT_MEM_START; 221 sysmem.bank[0].end = PLATFORM_DEFAULT_MEM_START 222 + PLATFORM_DEFAULT_MEM_SIZE; 223 } 224 225 /* Early hook for platforms */ 226 227 platform_init(bp_start); 228 229 /* Initialize MMU. */ 230 231 init_mmu(); 232} 233 234/* 235 * Initialize system. Setup memory and reserve regions. 236 */ 237 238extern char _end; 239extern char _stext; 240extern char _WindowVectors_text_start; 241extern char _WindowVectors_text_end; 242extern char _DebugInterruptVector_literal_start; 243extern char _DebugInterruptVector_text_end; 244extern char _KernelExceptionVector_literal_start; 245extern char _KernelExceptionVector_text_end; 246extern char _UserExceptionVector_literal_start; 247extern char _UserExceptionVector_text_end; 248extern char _DoubleExceptionVector_literal_start; 249extern char _DoubleExceptionVector_text_end; 250 251void __init setup_arch(char **cmdline_p) 252{ 253 extern int mem_reserve(unsigned long, unsigned long, int); 254 extern void bootmem_init(void); 255 256 memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE); 257 boot_command_line[COMMAND_LINE_SIZE-1] = '\0'; 258 *cmdline_p = command_line; 259 260 /* Reserve some memory regions */ 261 262#ifdef CONFIG_BLK_DEV_INITRD 263 if (initrd_start < initrd_end) { 264 initrd_is_mapped = mem_reserve(__pa(initrd_start), 265 __pa(initrd_end), 0); 266 initrd_below_start_ok = 1; 267 } else { 268 initrd_start = 0; 269 } 270#endif 271 272 mem_reserve(__pa(&_stext),__pa(&_end), 1); 273 274 mem_reserve(__pa(&_WindowVectors_text_start), 275 __pa(&_WindowVectors_text_end), 0); 276 277 mem_reserve(__pa(&_DebugInterruptVector_literal_start), 278 __pa(&_DebugInterruptVector_text_end), 0); 279 280 mem_reserve(__pa(&_KernelExceptionVector_literal_start), 281 __pa(&_KernelExceptionVector_text_end), 0); 282 283 mem_reserve(__pa(&_UserExceptionVector_literal_start), 284 __pa(&_UserExceptionVector_text_end), 0); 285 286 mem_reserve(__pa(&_DoubleExceptionVector_literal_start), 287 __pa(&_DoubleExceptionVector_text_end), 0); 288 289 bootmem_init(); 290 291 platform_setup(cmdline_p); 292 293 294 paging_init(); 295 zones_init(); 296 297#ifdef CONFIG_VT 298# if defined(CONFIG_VGA_CONSOLE) 299 conswitchp = &vga_con; 300# elif defined(CONFIG_DUMMY_CONSOLE) 301 conswitchp = &dummy_con; 302# endif 303#endif 304 305#ifdef CONFIG_PCI 306 platform_pcibios_init(); 307#endif 308} 309 310void machine_restart(char * cmd) 311{ 312 platform_restart(); 313} 314 315void machine_halt(void) 316{ 317 platform_halt(); 318 while (1); 319} 320 321void machine_power_off(void) 322{ 323 platform_power_off(); 324 while (1); 325} 326#ifdef CONFIG_PROC_FS 327 328/* 329 * Display some core information through /proc/cpuinfo. 330 */ 331 332static int 333c_show(struct seq_file *f, void *slot) 334{ 335 /* high-level stuff */ 336 seq_printf(f,"processor\t: 0\n" 337 "vendor_id\t: Tensilica\n" 338 "model\t\t: Xtensa " XCHAL_HW_VERSION_NAME "\n" 339 "core ID\t\t: " XCHAL_CORE_ID "\n" 340 "build ID\t: 0x%x\n" 341 "byte order\t: %s\n" 342 "cpu MHz\t\t: %lu.%02lu\n" 343 "bogomips\t: %lu.%02lu\n", 344 XCHAL_BUILD_UNIQUE_ID, 345 XCHAL_HAVE_BE ? "big" : "little", 346 CCOUNT_PER_JIFFY/(1000000/HZ), 347 (CCOUNT_PER_JIFFY/(10000/HZ)) % 100, 348 loops_per_jiffy/(500000/HZ), 349 (loops_per_jiffy/(5000/HZ)) % 100); 350 351 seq_printf(f,"flags\t\t: " 352#if XCHAL_HAVE_NMI 353 "nmi " 354#endif 355#if XCHAL_HAVE_DEBUG 356 "debug " 357# if XCHAL_HAVE_OCD 358 "ocd " 359# endif 360#endif 361#if XCHAL_HAVE_DENSITY 362 "density " 363#endif 364#if XCHAL_HAVE_BOOLEANS 365 "boolean " 366#endif 367#if XCHAL_HAVE_LOOPS 368 "loop " 369#endif 370#if XCHAL_HAVE_NSA 371 "nsa " 372#endif 373#if XCHAL_HAVE_MINMAX 374 "minmax " 375#endif 376#if XCHAL_HAVE_SEXT 377 "sext " 378#endif 379#if XCHAL_HAVE_CLAMPS 380 "clamps " 381#endif 382#if XCHAL_HAVE_MAC16 383 "mac16 " 384#endif 385#if XCHAL_HAVE_MUL16 386 "mul16 " 387#endif 388#if XCHAL_HAVE_MUL32 389 "mul32 " 390#endif 391#if XCHAL_HAVE_MUL32_HIGH 392 "mul32h " 393#endif 394#if XCHAL_HAVE_FP 395 "fpu " 396#endif 397 "\n"); 398 399 /* Registers. */ 400 seq_printf(f,"physical aregs\t: %d\n" 401 "misc regs\t: %d\n" 402 "ibreak\t\t: %d\n" 403 "dbreak\t\t: %d\n", 404 XCHAL_NUM_AREGS, 405 XCHAL_NUM_MISC_REGS, 406 XCHAL_NUM_IBREAK, 407 XCHAL_NUM_DBREAK); 408 409 410 /* Interrupt. */ 411 seq_printf(f,"num ints\t: %d\n" 412 "ext ints\t: %d\n" 413 "int levels\t: %d\n" 414 "timers\t\t: %d\n" 415 "debug level\t: %d\n", 416 XCHAL_NUM_INTERRUPTS, 417 XCHAL_NUM_EXTINTERRUPTS, 418 XCHAL_NUM_INTLEVELS, 419 XCHAL_NUM_TIMERS, 420 XCHAL_DEBUGLEVEL); 421 422 /* Cache */ 423 seq_printf(f,"icache line size: %d\n" 424 "icache ways\t: %d\n" 425 "icache size\t: %d\n" 426 "icache flags\t: " 427#if XCHAL_ICACHE_LINE_LOCKABLE 428 "lock" 429#endif 430 "\n" 431 "dcache line size: %d\n" 432 "dcache ways\t: %d\n" 433 "dcache size\t: %d\n" 434 "dcache flags\t: " 435#if XCHAL_DCACHE_IS_WRITEBACK 436 "writeback" 437#endif 438#if XCHAL_DCACHE_LINE_LOCKABLE 439 "lock" 440#endif 441 "\n", 442 XCHAL_ICACHE_LINESIZE, 443 XCHAL_ICACHE_WAYS, 444 XCHAL_ICACHE_SIZE, 445 XCHAL_DCACHE_LINESIZE, 446 XCHAL_DCACHE_WAYS, 447 XCHAL_DCACHE_SIZE); 448 449 return 0; 450} 451 452/* 453 * We show only CPU #0 info. 454 */ 455static void * 456c_start(struct seq_file *f, loff_t *pos) 457{ 458 return (void *) ((*pos == 0) ? (void *)1 : NULL); 459} 460 461static void * 462c_next(struct seq_file *f, void *v, loff_t *pos) 463{ 464 return NULL; 465} 466 467static void 468c_stop(struct seq_file *f, void *v) 469{ 470} 471 472const struct seq_operations cpuinfo_op = 473{ 474 start: c_start, 475 next: c_next, 476 stop: c_stop, 477 show: c_show 478}; 479 480#endif /* CONFIG_PROC_FS */ 481