| 1 | /* |
| 2 | * S390 version |
| 3 | * Copyright IBM Corp. 1999, 2012 |
| 4 | * Author(s): Hartmut Penner (hp@de.ibm.com), |
| 5 | * Martin Schwidefsky (schwidefsky@de.ibm.com) |
| 6 | * |
| 7 | * Derived from "arch/i386/kernel/setup.c" |
| 8 | * Copyright (C) 1995, Linus Torvalds |
| 9 | */ |
| 10 | |
| 11 | /* |
| 12 | * This file handles the architecture-dependent parts of initialization |
| 13 | */ |
| 14 | |
| 15 | #define KMSG_COMPONENT "setup" |
| 16 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
| 17 | |
| 18 | #include <linux/errno.h> |
| 19 | #include <linux/export.h> |
| 20 | #include <linux/sched.h> |
| 21 | #include <linux/sched/task.h> |
| 22 | #include <linux/cpu.h> |
| 23 | #include <linux/kernel.h> |
| 24 | #include <linux/memblock.h> |
| 25 | #include <linux/mm.h> |
| 26 | #include <linux/stddef.h> |
| 27 | #include <linux/unistd.h> |
| 28 | #include <linux/ptrace.h> |
| 29 | #include <linux/random.h> |
| 30 | #include <linux/user.h> |
| 31 | #include <linux/tty.h> |
| 32 | #include <linux/ioport.h> |
| 33 | #include <linux/delay.h> |
| 34 | #include <linux/init.h> |
| 35 | #include <linux/initrd.h> |
| 36 | #include <linux/bootmem.h> |
| 37 | #include <linux/root_dev.h> |
| 38 | #include <linux/console.h> |
| 39 | #include <linux/kernel_stat.h> |
| 40 | #include <linux/dma-contiguous.h> |
| 41 | #include <linux/device.h> |
| 42 | #include <linux/notifier.h> |
| 43 | #include <linux/pfn.h> |
| 44 | #include <linux/ctype.h> |
| 45 | #include <linux/reboot.h> |
| 46 | #include <linux/topology.h> |
| 47 | #include <linux/kexec.h> |
| 48 | #include <linux/crash_dump.h> |
| 49 | #include <linux/memory.h> |
| 50 | #include <linux/compat.h> |
| 51 | |
| 52 | #include <asm/ipl.h> |
| 53 | #include <asm/facility.h> |
| 54 | #include <asm/smp.h> |
| 55 | #include <asm/mmu_context.h> |
| 56 | #include <asm/cpcmd.h> |
| 57 | #include <asm/lowcore.h> |
| 58 | #include <asm/irq.h> |
| 59 | #include <asm/page.h> |
| 60 | #include <asm/ptrace.h> |
| 61 | #include <asm/sections.h> |
| 62 | #include <asm/ebcdic.h> |
| 63 | #include <asm/kvm_virtio.h> |
| 64 | #include <asm/diag.h> |
| 65 | #include <asm/os_info.h> |
| 66 | #include <asm/sclp.h> |
| 67 | #include <asm/sysinfo.h> |
| 68 | #include <asm/numa.h> |
| 69 | #include "entry.h" |
| 70 | |
| 71 | /* |
| 72 | * Machine setup.. |
| 73 | */ |
| 74 | unsigned int console_mode = 0; |
| 75 | EXPORT_SYMBOL(console_mode); |
| 76 | |
| 77 | unsigned int console_devno = -1; |
| 78 | EXPORT_SYMBOL(console_devno); |
| 79 | |
| 80 | unsigned int console_irq = -1; |
| 81 | EXPORT_SYMBOL(console_irq); |
| 82 | |
| 83 | unsigned long elf_hwcap __read_mostly = 0; |
| 84 | char elf_platform[ELF_PLATFORM_SIZE]; |
| 85 | |
| 86 | unsigned long int_hwcap = 0; |
| 87 | |
| 88 | int __initdata memory_end_set; |
| 89 | unsigned long __initdata memory_end; |
| 90 | unsigned long __initdata max_physmem_end; |
| 91 | |
| 92 | unsigned long VMALLOC_START; |
| 93 | EXPORT_SYMBOL(VMALLOC_START); |
| 94 | |
| 95 | unsigned long VMALLOC_END; |
| 96 | EXPORT_SYMBOL(VMALLOC_END); |
| 97 | |
| 98 | struct page *vmemmap; |
| 99 | EXPORT_SYMBOL(vmemmap); |
| 100 | |
| 101 | unsigned long MODULES_VADDR; |
| 102 | unsigned long MODULES_END; |
| 103 | |
| 104 | /* An array with a pointer to the lowcore of every CPU. */ |
| 105 | struct lowcore *lowcore_ptr[NR_CPUS]; |
| 106 | EXPORT_SYMBOL(lowcore_ptr); |
| 107 | |
| 108 | /* |
| 109 | * This is set up by the setup-routine at boot-time |
| 110 | * for S390 need to find out, what we have to setup |
| 111 | * using address 0x10400 ... |
| 112 | */ |
| 113 | |
| 114 | #include <asm/setup.h> |
| 115 | |
| 116 | /* |
| 117 | * condev= and conmode= setup parameter. |
| 118 | */ |
| 119 | |
| 120 | static int __init condev_setup(char *str) |
| 121 | { |
| 122 | int vdev; |
| 123 | |
| 124 | vdev = simple_strtoul(str, &str, 0); |
| 125 | if (vdev >= 0 && vdev < 65536) { |
| 126 | console_devno = vdev; |
| 127 | console_irq = -1; |
| 128 | } |
| 129 | return 1; |
| 130 | } |
| 131 | |
| 132 | __setup("condev=", condev_setup); |
| 133 | |
| 134 | static void __init set_preferred_console(void) |
| 135 | { |
| 136 | if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP) |
| 137 | add_preferred_console("ttyS", 0, NULL); |
| 138 | else if (CONSOLE_IS_3270) |
| 139 | add_preferred_console("tty3270", 0, NULL); |
| 140 | else if (CONSOLE_IS_VT220) |
| 141 | add_preferred_console("ttyS", 1, NULL); |
| 142 | else if (CONSOLE_IS_HVC) |
| 143 | add_preferred_console("hvc", 0, NULL); |
| 144 | } |
| 145 | |
| 146 | static int __init conmode_setup(char *str) |
| 147 | { |
| 148 | #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) |
| 149 | if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0) |
| 150 | SET_CONSOLE_SCLP; |
| 151 | #endif |
| 152 | #if defined(CONFIG_TN3215_CONSOLE) |
| 153 | if (strncmp(str, "3215", 5) == 0) |
| 154 | SET_CONSOLE_3215; |
| 155 | #endif |
| 156 | #if defined(CONFIG_TN3270_CONSOLE) |
| 157 | if (strncmp(str, "3270", 5) == 0) |
| 158 | SET_CONSOLE_3270; |
| 159 | #endif |
| 160 | set_preferred_console(); |
| 161 | return 1; |
| 162 | } |
| 163 | |
| 164 | __setup("conmode=", conmode_setup); |
| 165 | |
| 166 | static void __init conmode_default(void) |
| 167 | { |
| 168 | char query_buffer[1024]; |
| 169 | char *ptr; |
| 170 | |
| 171 | if (MACHINE_IS_VM) { |
| 172 | cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL); |
| 173 | console_devno = simple_strtoul(query_buffer + 5, NULL, 16); |
| 174 | ptr = strstr(query_buffer, "SUBCHANNEL ="); |
| 175 | console_irq = simple_strtoul(ptr + 13, NULL, 16); |
| 176 | cpcmd("QUERY TERM", query_buffer, 1024, NULL); |
| 177 | ptr = strstr(query_buffer, "CONMODE"); |
| 178 | /* |
| 179 | * Set the conmode to 3215 so that the device recognition |
| 180 | * will set the cu_type of the console to 3215. If the |
| 181 | * conmode is 3270 and we don't set it back then both |
| 182 | * 3215 and the 3270 driver will try to access the console |
| 183 | * device (3215 as console and 3270 as normal tty). |
| 184 | */ |
| 185 | cpcmd("TERM CONMODE 3215", NULL, 0, NULL); |
| 186 | if (ptr == NULL) { |
| 187 | #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) |
| 188 | SET_CONSOLE_SCLP; |
| 189 | #endif |
| 190 | return; |
| 191 | } |
| 192 | if (strncmp(ptr + 8, "3270", 4) == 0) { |
| 193 | #if defined(CONFIG_TN3270_CONSOLE) |
| 194 | SET_CONSOLE_3270; |
| 195 | #elif defined(CONFIG_TN3215_CONSOLE) |
| 196 | SET_CONSOLE_3215; |
| 197 | #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) |
| 198 | SET_CONSOLE_SCLP; |
| 199 | #endif |
| 200 | } else if (strncmp(ptr + 8, "3215", 4) == 0) { |
| 201 | #if defined(CONFIG_TN3215_CONSOLE) |
| 202 | SET_CONSOLE_3215; |
| 203 | #elif defined(CONFIG_TN3270_CONSOLE) |
| 204 | SET_CONSOLE_3270; |
| 205 | #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) |
| 206 | SET_CONSOLE_SCLP; |
| 207 | #endif |
| 208 | } |
| 209 | } else if (MACHINE_IS_KVM) { |
| 210 | if (sclp.has_vt220 && IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE)) |
| 211 | SET_CONSOLE_VT220; |
| 212 | else if (sclp.has_linemode && IS_ENABLED(CONFIG_SCLP_CONSOLE)) |
| 213 | SET_CONSOLE_SCLP; |
| 214 | else |
| 215 | SET_CONSOLE_HVC; |
| 216 | } else { |
| 217 | #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) |
| 218 | SET_CONSOLE_SCLP; |
| 219 | #endif |
| 220 | } |
| 221 | } |
| 222 | |
| 223 | #ifdef CONFIG_CRASH_DUMP |
| 224 | static void __init setup_zfcpdump(void) |
| 225 | { |
| 226 | if (ipl_info.type != IPL_TYPE_FCP_DUMP) |
| 227 | return; |
| 228 | if (OLDMEM_BASE) |
| 229 | return; |
| 230 | strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev"); |
| 231 | console_loglevel = 2; |
| 232 | } |
| 233 | #else |
| 234 | static inline void setup_zfcpdump(void) {} |
| 235 | #endif /* CONFIG_CRASH_DUMP */ |
| 236 | |
| 237 | /* |
| 238 | * Reboot, halt and power_off stubs. They just call _machine_restart, |
| 239 | * _machine_halt or _machine_power_off. |
| 240 | */ |
| 241 | |
| 242 | void machine_restart(char *command) |
| 243 | { |
| 244 | if ((!in_interrupt() && !in_atomic()) || oops_in_progress) |
| 245 | /* |
| 246 | * Only unblank the console if we are called in enabled |
| 247 | * context or a bust_spinlocks cleared the way for us. |
| 248 | */ |
| 249 | console_unblank(); |
| 250 | _machine_restart(command); |
| 251 | } |
| 252 | |
| 253 | void machine_halt(void) |
| 254 | { |
| 255 | if (!in_interrupt() || oops_in_progress) |
| 256 | /* |
| 257 | * Only unblank the console if we are called in enabled |
| 258 | * context or a bust_spinlocks cleared the way for us. |
| 259 | */ |
| 260 | console_unblank(); |
| 261 | _machine_halt(); |
| 262 | } |
| 263 | |
| 264 | void machine_power_off(void) |
| 265 | { |
| 266 | if (!in_interrupt() || oops_in_progress) |
| 267 | /* |
| 268 | * Only unblank the console if we are called in enabled |
| 269 | * context or a bust_spinlocks cleared the way for us. |
| 270 | */ |
| 271 | console_unblank(); |
| 272 | _machine_power_off(); |
| 273 | } |
| 274 | |
| 275 | /* |
| 276 | * Dummy power off function. |
| 277 | */ |
| 278 | void (*pm_power_off)(void) = machine_power_off; |
| 279 | EXPORT_SYMBOL_GPL(pm_power_off); |
| 280 | |
| 281 | static int __init early_parse_mem(char *p) |
| 282 | { |
| 283 | memory_end = memparse(p, &p); |
| 284 | memory_end &= PAGE_MASK; |
| 285 | memory_end_set = 1; |
| 286 | return 0; |
| 287 | } |
| 288 | early_param("mem", early_parse_mem); |
| 289 | |
| 290 | static int __init parse_vmalloc(char *arg) |
| 291 | { |
| 292 | if (!arg) |
| 293 | return -EINVAL; |
| 294 | VMALLOC_END = (memparse(arg, &arg) + PAGE_SIZE - 1) & PAGE_MASK; |
| 295 | return 0; |
| 296 | } |
| 297 | early_param("vmalloc", parse_vmalloc); |
| 298 | |
| 299 | void *restart_stack __section(.data); |
| 300 | |
| 301 | static void __init setup_lowcore(void) |
| 302 | { |
| 303 | struct lowcore *lc; |
| 304 | |
| 305 | /* |
| 306 | * Setup lowcore for boot cpu |
| 307 | */ |
| 308 | BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * PAGE_SIZE); |
| 309 | lc = memblock_virt_alloc_low(sizeof(*lc), sizeof(*lc)); |
| 310 | lc->restart_psw.mask = PSW_KERNEL_BITS; |
| 311 | lc->restart_psw.addr = (unsigned long) restart_int_handler; |
| 312 | lc->external_new_psw.mask = PSW_KERNEL_BITS | |
| 313 | PSW_MASK_DAT | PSW_MASK_MCHECK; |
| 314 | lc->external_new_psw.addr = (unsigned long) ext_int_handler; |
| 315 | lc->svc_new_psw.mask = PSW_KERNEL_BITS | |
| 316 | PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK; |
| 317 | lc->svc_new_psw.addr = (unsigned long) system_call; |
| 318 | lc->program_new_psw.mask = PSW_KERNEL_BITS | |
| 319 | PSW_MASK_DAT | PSW_MASK_MCHECK; |
| 320 | lc->program_new_psw.addr = (unsigned long) pgm_check_handler; |
| 321 | lc->mcck_new_psw.mask = PSW_KERNEL_BITS; |
| 322 | lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler; |
| 323 | lc->io_new_psw.mask = PSW_KERNEL_BITS | |
| 324 | PSW_MASK_DAT | PSW_MASK_MCHECK; |
| 325 | lc->io_new_psw.addr = (unsigned long) io_int_handler; |
| 326 | lc->clock_comparator = clock_comparator_max; |
| 327 | lc->kernel_stack = ((unsigned long) &init_thread_union) |
| 328 | + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); |
| 329 | lc->async_stack = (unsigned long) |
| 330 | memblock_virt_alloc(ASYNC_SIZE, ASYNC_SIZE) |
| 331 | + ASYNC_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); |
| 332 | lc->panic_stack = (unsigned long) |
| 333 | memblock_virt_alloc(PAGE_SIZE, PAGE_SIZE) |
| 334 | + PAGE_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); |
| 335 | lc->current_task = (unsigned long)&init_task; |
| 336 | lc->lpp = LPP_MAGIC; |
| 337 | lc->machine_flags = S390_lowcore.machine_flags; |
| 338 | lc->preempt_count = S390_lowcore.preempt_count; |
| 339 | lc->stfl_fac_list = S390_lowcore.stfl_fac_list; |
| 340 | memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list, |
| 341 | MAX_FACILITY_BIT/8); |
| 342 | if (MACHINE_HAS_VX || MACHINE_HAS_GS) { |
| 343 | unsigned long bits, size; |
| 344 | |
| 345 | bits = MACHINE_HAS_GS ? 11 : 10; |
| 346 | size = 1UL << bits; |
| 347 | lc->mcesad = (__u64) memblock_virt_alloc(size, size); |
| 348 | if (MACHINE_HAS_GS) |
| 349 | lc->mcesad |= bits; |
| 350 | } |
| 351 | lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0]; |
| 352 | lc->sync_enter_timer = S390_lowcore.sync_enter_timer; |
| 353 | lc->async_enter_timer = S390_lowcore.async_enter_timer; |
| 354 | lc->exit_timer = S390_lowcore.exit_timer; |
| 355 | lc->user_timer = S390_lowcore.user_timer; |
| 356 | lc->system_timer = S390_lowcore.system_timer; |
| 357 | lc->steal_timer = S390_lowcore.steal_timer; |
| 358 | lc->last_update_timer = S390_lowcore.last_update_timer; |
| 359 | lc->last_update_clock = S390_lowcore.last_update_clock; |
| 360 | |
| 361 | restart_stack = memblock_virt_alloc(ASYNC_SIZE, ASYNC_SIZE); |
| 362 | restart_stack += ASYNC_SIZE; |
| 363 | |
| 364 | /* |
| 365 | * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant |
| 366 | * restart data to the absolute zero lowcore. This is necessary if |
| 367 | * PSW restart is done on an offline CPU that has lowcore zero. |
| 368 | */ |
| 369 | lc->restart_stack = (unsigned long) restart_stack; |
| 370 | lc->restart_fn = (unsigned long) do_restart; |
| 371 | lc->restart_data = 0; |
| 372 | lc->restart_source = -1UL; |
| 373 | |
| 374 | /* Setup absolute zero lowcore */ |
| 375 | mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack); |
| 376 | mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn); |
| 377 | mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data); |
| 378 | mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source); |
| 379 | mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw); |
| 380 | |
| 381 | #ifdef CONFIG_SMP |
| 382 | lc->spinlock_lockval = arch_spin_lockval(0); |
| 383 | #endif |
| 384 | |
| 385 | set_prefix((u32)(unsigned long) lc); |
| 386 | lowcore_ptr[0] = lc; |
| 387 | } |
| 388 | |
| 389 | static struct resource code_resource = { |
| 390 | .name = "Kernel code", |
| 391 | .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, |
| 392 | }; |
| 393 | |
| 394 | static struct resource data_resource = { |
| 395 | .name = "Kernel data", |
| 396 | .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, |
| 397 | }; |
| 398 | |
| 399 | static struct resource bss_resource = { |
| 400 | .name = "Kernel bss", |
| 401 | .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, |
| 402 | }; |
| 403 | |
| 404 | static struct resource __initdata *standard_resources[] = { |
| 405 | &code_resource, |
| 406 | &data_resource, |
| 407 | &bss_resource, |
| 408 | }; |
| 409 | |
| 410 | static void __init setup_resources(void) |
| 411 | { |
| 412 | struct resource *res, *std_res, *sub_res; |
| 413 | struct memblock_region *reg; |
| 414 | int j; |
| 415 | |
| 416 | code_resource.start = (unsigned long) &_text; |
| 417 | code_resource.end = (unsigned long) &_etext - 1; |
| 418 | data_resource.start = (unsigned long) &_etext; |
| 419 | data_resource.end = (unsigned long) &_edata - 1; |
| 420 | bss_resource.start = (unsigned long) &__bss_start; |
| 421 | bss_resource.end = (unsigned long) &__bss_stop - 1; |
| 422 | |
| 423 | for_each_memblock(memory, reg) { |
| 424 | res = memblock_virt_alloc(sizeof(*res), 8); |
| 425 | res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM; |
| 426 | |
| 427 | res->name = "System RAM"; |
| 428 | res->start = reg->base; |
| 429 | res->end = reg->base + reg->size - 1; |
| 430 | request_resource(&iomem_resource, res); |
| 431 | |
| 432 | for (j = 0; j < ARRAY_SIZE(standard_resources); j++) { |
| 433 | std_res = standard_resources[j]; |
| 434 | if (std_res->start < res->start || |
| 435 | std_res->start > res->end) |
| 436 | continue; |
| 437 | if (std_res->end > res->end) { |
| 438 | sub_res = memblock_virt_alloc(sizeof(*sub_res), 8); |
| 439 | *sub_res = *std_res; |
| 440 | sub_res->end = res->end; |
| 441 | std_res->start = res->end + 1; |
| 442 | request_resource(res, sub_res); |
| 443 | } else { |
| 444 | request_resource(res, std_res); |
| 445 | } |
| 446 | } |
| 447 | } |
| 448 | #ifdef CONFIG_CRASH_DUMP |
| 449 | /* |
| 450 | * Re-add removed crash kernel memory as reserved memory. This makes |
| 451 | * sure it will be mapped with the identity mapping and struct pages |
| 452 | * will be created, so it can be resized later on. |
| 453 | * However add it later since the crash kernel resource should not be |
| 454 | * part of the System RAM resource. |
| 455 | */ |
| 456 | if (crashk_res.end) { |
| 457 | memblock_add_node(crashk_res.start, resource_size(&crashk_res), 0); |
| 458 | memblock_reserve(crashk_res.start, resource_size(&crashk_res)); |
| 459 | insert_resource(&iomem_resource, &crashk_res); |
| 460 | } |
| 461 | #endif |
| 462 | } |
| 463 | |
| 464 | static void __init setup_memory_end(void) |
| 465 | { |
| 466 | unsigned long vmax, vmalloc_size, tmp; |
| 467 | |
| 468 | /* Choose kernel address space layout: 2, 3, or 4 levels. */ |
| 469 | vmalloc_size = VMALLOC_END ?: (128UL << 30) - MODULES_LEN; |
| 470 | tmp = (memory_end ?: max_physmem_end) / PAGE_SIZE; |
| 471 | tmp = tmp * (sizeof(struct page) + PAGE_SIZE); |
| 472 | if (tmp + vmalloc_size + MODULES_LEN <= _REGION2_SIZE) |
| 473 | vmax = _REGION2_SIZE; /* 3-level kernel page table */ |
| 474 | else |
| 475 | vmax = _REGION1_SIZE; /* 4-level kernel page table */ |
| 476 | /* module area is at the end of the kernel address space. */ |
| 477 | MODULES_END = vmax; |
| 478 | MODULES_VADDR = MODULES_END - MODULES_LEN; |
| 479 | VMALLOC_END = MODULES_VADDR; |
| 480 | VMALLOC_START = vmax - vmalloc_size; |
| 481 | |
| 482 | /* Split remaining virtual space between 1:1 mapping & vmemmap array */ |
| 483 | tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page)); |
| 484 | /* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */ |
| 485 | tmp = SECTION_ALIGN_UP(tmp); |
| 486 | tmp = VMALLOC_START - tmp * sizeof(struct page); |
| 487 | tmp &= ~((vmax >> 11) - 1); /* align to page table level */ |
| 488 | tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS); |
| 489 | vmemmap = (struct page *) tmp; |
| 490 | |
| 491 | /* Take care that memory_end is set and <= vmemmap */ |
| 492 | memory_end = min(memory_end ?: max_physmem_end, tmp); |
| 493 | max_pfn = max_low_pfn = PFN_DOWN(memory_end); |
| 494 | memblock_remove(memory_end, ULONG_MAX); |
| 495 | |
| 496 | pr_notice("The maximum memory size is %luMB\n", memory_end >> 20); |
| 497 | } |
| 498 | |
| 499 | #ifdef CONFIG_CRASH_DUMP |
| 500 | |
| 501 | /* |
| 502 | * When kdump is enabled, we have to ensure that no memory from |
| 503 | * the area [0 - crashkernel memory size] and |
| 504 | * [crashk_res.start - crashk_res.end] is set offline. |
| 505 | */ |
| 506 | static int kdump_mem_notifier(struct notifier_block *nb, |
| 507 | unsigned long action, void *data) |
| 508 | { |
| 509 | struct memory_notify *arg = data; |
| 510 | |
| 511 | if (action != MEM_GOING_OFFLINE) |
| 512 | return NOTIFY_OK; |
| 513 | if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res))) |
| 514 | return NOTIFY_BAD; |
| 515 | if (arg->start_pfn > PFN_DOWN(crashk_res.end)) |
| 516 | return NOTIFY_OK; |
| 517 | if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start)) |
| 518 | return NOTIFY_OK; |
| 519 | return NOTIFY_BAD; |
| 520 | } |
| 521 | |
| 522 | static struct notifier_block kdump_mem_nb = { |
| 523 | .notifier_call = kdump_mem_notifier, |
| 524 | }; |
| 525 | |
| 526 | #endif |
| 527 | |
| 528 | /* |
| 529 | * Make sure that the area behind memory_end is protected |
| 530 | */ |
| 531 | static void reserve_memory_end(void) |
| 532 | { |
| 533 | #ifdef CONFIG_CRASH_DUMP |
| 534 | if (ipl_info.type == IPL_TYPE_FCP_DUMP && |
| 535 | !OLDMEM_BASE && sclp.hsa_size) { |
| 536 | memory_end = sclp.hsa_size; |
| 537 | memory_end &= PAGE_MASK; |
| 538 | memory_end_set = 1; |
| 539 | } |
| 540 | #endif |
| 541 | if (!memory_end_set) |
| 542 | return; |
| 543 | memblock_reserve(memory_end, ULONG_MAX); |
| 544 | } |
| 545 | |
| 546 | /* |
| 547 | * Make sure that oldmem, where the dump is stored, is protected |
| 548 | */ |
| 549 | static void reserve_oldmem(void) |
| 550 | { |
| 551 | #ifdef CONFIG_CRASH_DUMP |
| 552 | if (OLDMEM_BASE) |
| 553 | /* Forget all memory above the running kdump system */ |
| 554 | memblock_reserve(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX); |
| 555 | #endif |
| 556 | } |
| 557 | |
| 558 | /* |
| 559 | * Make sure that oldmem, where the dump is stored, is protected |
| 560 | */ |
| 561 | static void remove_oldmem(void) |
| 562 | { |
| 563 | #ifdef CONFIG_CRASH_DUMP |
| 564 | if (OLDMEM_BASE) |
| 565 | /* Forget all memory above the running kdump system */ |
| 566 | memblock_remove(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX); |
| 567 | #endif |
| 568 | } |
| 569 | |
| 570 | /* |
| 571 | * Reserve memory for kdump kernel to be loaded with kexec |
| 572 | */ |
| 573 | static void __init reserve_crashkernel(void) |
| 574 | { |
| 575 | #ifdef CONFIG_CRASH_DUMP |
| 576 | unsigned long long crash_base, crash_size; |
| 577 | phys_addr_t low, high; |
| 578 | int rc; |
| 579 | |
| 580 | rc = parse_crashkernel(boot_command_line, memory_end, &crash_size, |
| 581 | &crash_base); |
| 582 | |
| 583 | crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN); |
| 584 | crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN); |
| 585 | if (rc || crash_size == 0) |
| 586 | return; |
| 587 | |
| 588 | if (memblock.memory.regions[0].size < crash_size) { |
| 589 | pr_info("crashkernel reservation failed: %s\n", |
| 590 | "first memory chunk must be at least crashkernel size"); |
| 591 | return; |
| 592 | } |
| 593 | |
| 594 | low = crash_base ?: OLDMEM_BASE; |
| 595 | high = low + crash_size; |
| 596 | if (low >= OLDMEM_BASE && high <= OLDMEM_BASE + OLDMEM_SIZE) { |
| 597 | /* The crashkernel fits into OLDMEM, reuse OLDMEM */ |
| 598 | crash_base = low; |
| 599 | } else { |
| 600 | /* Find suitable area in free memory */ |
| 601 | low = max_t(unsigned long, crash_size, sclp.hsa_size); |
| 602 | high = crash_base ? crash_base + crash_size : ULONG_MAX; |
| 603 | |
| 604 | if (crash_base && crash_base < low) { |
| 605 | pr_info("crashkernel reservation failed: %s\n", |
| 606 | "crash_base too low"); |
| 607 | return; |
| 608 | } |
| 609 | low = crash_base ?: low; |
| 610 | crash_base = memblock_find_in_range(low, high, crash_size, |
| 611 | KEXEC_CRASH_MEM_ALIGN); |
| 612 | } |
| 613 | |
| 614 | if (!crash_base) { |
| 615 | pr_info("crashkernel reservation failed: %s\n", |
| 616 | "no suitable area found"); |
| 617 | return; |
| 618 | } |
| 619 | |
| 620 | if (register_memory_notifier(&kdump_mem_nb)) |
| 621 | return; |
| 622 | |
| 623 | if (!OLDMEM_BASE && MACHINE_IS_VM) |
| 624 | diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size)); |
| 625 | crashk_res.start = crash_base; |
| 626 | crashk_res.end = crash_base + crash_size - 1; |
| 627 | memblock_remove(crash_base, crash_size); |
| 628 | pr_info("Reserving %lluMB of memory at %lluMB " |
| 629 | "for crashkernel (System RAM: %luMB)\n", |
| 630 | crash_size >> 20, crash_base >> 20, |
| 631 | (unsigned long)memblock.memory.total_size >> 20); |
| 632 | os_info_crashkernel_add(crash_base, crash_size); |
| 633 | #endif |
| 634 | } |
| 635 | |
| 636 | /* |
| 637 | * Reserve the initrd from being used by memblock |
| 638 | */ |
| 639 | static void __init reserve_initrd(void) |
| 640 | { |
| 641 | #ifdef CONFIG_BLK_DEV_INITRD |
| 642 | if (!INITRD_START || !INITRD_SIZE) |
| 643 | return; |
| 644 | initrd_start = INITRD_START; |
| 645 | initrd_end = initrd_start + INITRD_SIZE; |
| 646 | memblock_reserve(INITRD_START, INITRD_SIZE); |
| 647 | #endif |
| 648 | } |
| 649 | |
| 650 | /* |
| 651 | * Check for initrd being in usable memory |
| 652 | */ |
| 653 | static void __init check_initrd(void) |
| 654 | { |
| 655 | #ifdef CONFIG_BLK_DEV_INITRD |
| 656 | if (INITRD_START && INITRD_SIZE && |
| 657 | !memblock_is_region_memory(INITRD_START, INITRD_SIZE)) { |
| 658 | pr_err("The initial RAM disk does not fit into the memory\n"); |
| 659 | memblock_free(INITRD_START, INITRD_SIZE); |
| 660 | initrd_start = initrd_end = 0; |
| 661 | } |
| 662 | #endif |
| 663 | } |
| 664 | |
| 665 | /* |
| 666 | * Reserve memory used for lowcore/command line/kernel image. |
| 667 | */ |
| 668 | static void __init reserve_kernel(void) |
| 669 | { |
| 670 | unsigned long start_pfn = PFN_UP(__pa(&_end)); |
| 671 | |
| 672 | #ifdef CONFIG_DMA_API_DEBUG |
| 673 | /* |
| 674 | * DMA_API_DEBUG code stumbles over addresses from the |
| 675 | * range [_ehead, _stext]. Mark the memory as reserved |
| 676 | * so it is not used for CONFIG_DMA_API_DEBUG=y. |
| 677 | */ |
| 678 | memblock_reserve(0, PFN_PHYS(start_pfn)); |
| 679 | #else |
| 680 | memblock_reserve(0, (unsigned long)_ehead); |
| 681 | memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn) |
| 682 | - (unsigned long)_stext); |
| 683 | #endif |
| 684 | } |
| 685 | |
| 686 | static void __init setup_memory(void) |
| 687 | { |
| 688 | struct memblock_region *reg; |
| 689 | |
| 690 | /* |
| 691 | * Init storage key for present memory |
| 692 | */ |
| 693 | for_each_memblock(memory, reg) { |
| 694 | storage_key_init_range(reg->base, reg->base + reg->size); |
| 695 | } |
| 696 | psw_set_key(PAGE_DEFAULT_KEY); |
| 697 | |
| 698 | /* Only cosmetics */ |
| 699 | memblock_enforce_memory_limit(memblock_end_of_DRAM()); |
| 700 | } |
| 701 | |
| 702 | /* |
| 703 | * Setup hardware capabilities. |
| 704 | */ |
| 705 | static int __init setup_hwcaps(void) |
| 706 | { |
| 707 | static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 }; |
| 708 | struct cpuid cpu_id; |
| 709 | int i; |
| 710 | |
| 711 | /* |
| 712 | * The store facility list bits numbers as found in the principles |
| 713 | * of operation are numbered with bit 1UL<<31 as number 0 to |
| 714 | * bit 1UL<<0 as number 31. |
| 715 | * Bit 0: instructions named N3, "backported" to esa-mode |
| 716 | * Bit 2: z/Architecture mode is active |
| 717 | * Bit 7: the store-facility-list-extended facility is installed |
| 718 | * Bit 17: the message-security assist is installed |
| 719 | * Bit 19: the long-displacement facility is installed |
| 720 | * Bit 21: the extended-immediate facility is installed |
| 721 | * Bit 22: extended-translation facility 3 is installed |
| 722 | * Bit 30: extended-translation facility 3 enhancement facility |
| 723 | * These get translated to: |
| 724 | * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1, |
| 725 | * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3, |
| 726 | * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and |
| 727 | * HWCAP_S390_ETF3EH bit 8 (22 && 30). |
| 728 | */ |
| 729 | for (i = 0; i < 6; i++) |
| 730 | if (test_facility(stfl_bits[i])) |
| 731 | elf_hwcap |= 1UL << i; |
| 732 | |
| 733 | if (test_facility(22) && test_facility(30)) |
| 734 | elf_hwcap |= HWCAP_S390_ETF3EH; |
| 735 | |
| 736 | /* |
| 737 | * Check for additional facilities with store-facility-list-extended. |
| 738 | * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0 |
| 739 | * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information |
| 740 | * as stored by stfl, bits 32-xxx contain additional facilities. |
| 741 | * How many facility words are stored depends on the number of |
| 742 | * doublewords passed to the instruction. The additional facilities |
| 743 | * are: |
| 744 | * Bit 42: decimal floating point facility is installed |
| 745 | * Bit 44: perform floating point operation facility is installed |
| 746 | * translated to: |
| 747 | * HWCAP_S390_DFP bit 6 (42 && 44). |
| 748 | */ |
| 749 | if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44)) |
| 750 | elf_hwcap |= HWCAP_S390_DFP; |
| 751 | |
| 752 | /* |
| 753 | * Huge page support HWCAP_S390_HPAGE is bit 7. |
| 754 | */ |
| 755 | if (MACHINE_HAS_EDAT1) |
| 756 | elf_hwcap |= HWCAP_S390_HPAGE; |
| 757 | |
| 758 | /* |
| 759 | * 64-bit register support for 31-bit processes |
| 760 | * HWCAP_S390_HIGH_GPRS is bit 9. |
| 761 | */ |
| 762 | elf_hwcap |= HWCAP_S390_HIGH_GPRS; |
| 763 | |
| 764 | /* |
| 765 | * Transactional execution support HWCAP_S390_TE is bit 10. |
| 766 | */ |
| 767 | if (test_facility(50) && test_facility(73)) |
| 768 | elf_hwcap |= HWCAP_S390_TE; |
| 769 | |
| 770 | /* |
| 771 | * Vector extension HWCAP_S390_VXRS is bit 11. The Vector extension |
| 772 | * can be disabled with the "novx" parameter. Use MACHINE_HAS_VX |
| 773 | * instead of facility bit 129. |
| 774 | */ |
| 775 | if (MACHINE_HAS_VX) { |
| 776 | elf_hwcap |= HWCAP_S390_VXRS; |
| 777 | if (test_facility(134)) |
| 778 | elf_hwcap |= HWCAP_S390_VXRS_EXT; |
| 779 | if (test_facility(135)) |
| 780 | elf_hwcap |= HWCAP_S390_VXRS_BCD; |
| 781 | } |
| 782 | |
| 783 | /* |
| 784 | * Guarded storage support HWCAP_S390_GS is bit 12. |
| 785 | */ |
| 786 | if (MACHINE_HAS_GS) |
| 787 | elf_hwcap |= HWCAP_S390_GS; |
| 788 | |
| 789 | get_cpu_id(&cpu_id); |
| 790 | add_device_randomness(&cpu_id, sizeof(cpu_id)); |
| 791 | switch (cpu_id.machine) { |
| 792 | case 0x2064: |
| 793 | case 0x2066: |
| 794 | default: /* Use "z900" as default for 64 bit kernels. */ |
| 795 | strcpy(elf_platform, "z900"); |
| 796 | break; |
| 797 | case 0x2084: |
| 798 | case 0x2086: |
| 799 | strcpy(elf_platform, "z990"); |
| 800 | break; |
| 801 | case 0x2094: |
| 802 | case 0x2096: |
| 803 | strcpy(elf_platform, "z9-109"); |
| 804 | break; |
| 805 | case 0x2097: |
| 806 | case 0x2098: |
| 807 | strcpy(elf_platform, "z10"); |
| 808 | break; |
| 809 | case 0x2817: |
| 810 | case 0x2818: |
| 811 | strcpy(elf_platform, "z196"); |
| 812 | break; |
| 813 | case 0x2827: |
| 814 | case 0x2828: |
| 815 | strcpy(elf_platform, "zEC12"); |
| 816 | break; |
| 817 | case 0x2964: |
| 818 | case 0x2965: |
| 819 | strcpy(elf_platform, "z13"); |
| 820 | break; |
| 821 | } |
| 822 | |
| 823 | /* |
| 824 | * Virtualization support HWCAP_INT_SIE is bit 0. |
| 825 | */ |
| 826 | if (sclp.has_sief2) |
| 827 | int_hwcap |= HWCAP_INT_SIE; |
| 828 | |
| 829 | return 0; |
| 830 | } |
| 831 | arch_initcall(setup_hwcaps); |
| 832 | |
| 833 | /* |
| 834 | * Add system information as device randomness |
| 835 | */ |
| 836 | static void __init setup_randomness(void) |
| 837 | { |
| 838 | struct sysinfo_3_2_2 *vmms; |
| 839 | |
| 840 | vmms = (struct sysinfo_3_2_2 *) memblock_alloc(PAGE_SIZE, PAGE_SIZE); |
| 841 | if (stsi(vmms, 3, 2, 2) == 0 && vmms->count) |
| 842 | add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count); |
| 843 | memblock_free((unsigned long) vmms, PAGE_SIZE); |
| 844 | } |
| 845 | |
| 846 | /* |
| 847 | * Find the correct size for the task_struct. This depends on |
| 848 | * the size of the struct fpu at the end of the thread_struct |
| 849 | * which is embedded in the task_struct. |
| 850 | */ |
| 851 | static void __init setup_task_size(void) |
| 852 | { |
| 853 | int task_size = sizeof(struct task_struct); |
| 854 | |
| 855 | if (!MACHINE_HAS_VX) { |
| 856 | task_size -= sizeof(__vector128) * __NUM_VXRS; |
| 857 | task_size += sizeof(freg_t) * __NUM_FPRS; |
| 858 | } |
| 859 | arch_task_struct_size = task_size; |
| 860 | } |
| 861 | |
| 862 | /* |
| 863 | * Setup function called from init/main.c just after the banner |
| 864 | * was printed. |
| 865 | */ |
| 866 | |
| 867 | void __init setup_arch(char **cmdline_p) |
| 868 | { |
| 869 | /* |
| 870 | * print what head.S has found out about the machine |
| 871 | */ |
| 872 | if (MACHINE_IS_VM) |
| 873 | pr_info("Linux is running as a z/VM " |
| 874 | "guest operating system in 64-bit mode\n"); |
| 875 | else if (MACHINE_IS_KVM) |
| 876 | pr_info("Linux is running under KVM in 64-bit mode\n"); |
| 877 | else if (MACHINE_IS_LPAR) |
| 878 | pr_info("Linux is running natively in 64-bit mode\n"); |
| 879 | |
| 880 | /* Have one command line that is parsed and saved in /proc/cmdline */ |
| 881 | /* boot_command_line has been already set up in early.c */ |
| 882 | *cmdline_p = boot_command_line; |
| 883 | |
| 884 | ROOT_DEV = Root_RAM0; |
| 885 | |
| 886 | /* Is init_mm really needed? */ |
| 887 | init_mm.start_code = PAGE_OFFSET; |
| 888 | init_mm.end_code = (unsigned long) &_etext; |
| 889 | init_mm.end_data = (unsigned long) &_edata; |
| 890 | init_mm.brk = (unsigned long) &_end; |
| 891 | |
| 892 | parse_early_param(); |
| 893 | #ifdef CONFIG_CRASH_DUMP |
| 894 | /* Deactivate elfcorehdr= kernel parameter */ |
| 895 | elfcorehdr_addr = ELFCORE_ADDR_MAX; |
| 896 | #endif |
| 897 | |
| 898 | os_info_init(); |
| 899 | setup_ipl(); |
| 900 | setup_task_size(); |
| 901 | |
| 902 | /* Do some memory reservations *before* memory is added to memblock */ |
| 903 | reserve_memory_end(); |
| 904 | reserve_oldmem(); |
| 905 | reserve_kernel(); |
| 906 | reserve_initrd(); |
| 907 | memblock_allow_resize(); |
| 908 | |
| 909 | /* Get information about *all* installed memory */ |
| 910 | detect_memory_memblock(); |
| 911 | |
| 912 | remove_oldmem(); |
| 913 | |
| 914 | /* |
| 915 | * Make sure all chunks are MAX_ORDER aligned so we don't need the |
| 916 | * extra checks that HOLES_IN_ZONE would require. |
| 917 | * |
| 918 | * Is this still required? |
| 919 | */ |
| 920 | memblock_trim_memory(1UL << (MAX_ORDER - 1 + PAGE_SHIFT)); |
| 921 | |
| 922 | setup_memory_end(); |
| 923 | setup_memory(); |
| 924 | dma_contiguous_reserve(memory_end); |
| 925 | |
| 926 | check_initrd(); |
| 927 | reserve_crashkernel(); |
| 928 | #ifdef CONFIG_CRASH_DUMP |
| 929 | /* |
| 930 | * Be aware that smp_save_dump_cpus() triggers a system reset. |
| 931 | * Therefore CPU and device initialization should be done afterwards. |
| 932 | */ |
| 933 | smp_save_dump_cpus(); |
| 934 | #endif |
| 935 | |
| 936 | setup_resources(); |
| 937 | setup_lowcore(); |
| 938 | smp_fill_possible_mask(); |
| 939 | cpu_detect_mhz_feature(); |
| 940 | cpu_init(); |
| 941 | numa_setup(); |
| 942 | smp_detect_cpus(); |
| 943 | topology_init_early(); |
| 944 | |
| 945 | /* |
| 946 | * Create kernel page tables and switch to virtual addressing. |
| 947 | */ |
| 948 | paging_init(); |
| 949 | |
| 950 | /* Setup default console */ |
| 951 | conmode_default(); |
| 952 | set_preferred_console(); |
| 953 | |
| 954 | /* Setup zfcpdump support */ |
| 955 | setup_zfcpdump(); |
| 956 | |
| 957 | /* Add system specific data to the random pool */ |
| 958 | setup_randomness(); |
| 959 | } |