3 * Copyright IBM Corp. 1999, 2012
4 * Author(s): Hartmut Penner (hp@de.ibm.com),
5 * Martin Schwidefsky (schwidefsky@de.ibm.com)
7 * Derived from "arch/i386/kernel/setup.c"
8 * Copyright (C) 1995, Linus Torvalds
12 * This file handles the architecture-dependent parts of initialization
15 #define KMSG_COMPONENT "setup"
16 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
18 #include <linux/errno.h>
19 #include <linux/export.h>
20 #include <linux/sched.h>
21 #include <linux/kernel.h>
22 #include <linux/memblock.h>
24 #include <linux/stddef.h>
25 #include <linux/unistd.h>
26 #include <linux/ptrace.h>
27 #include <linux/random.h>
28 #include <linux/user.h>
29 #include <linux/tty.h>
30 #include <linux/ioport.h>
31 #include <linux/delay.h>
32 #include <linux/init.h>
33 #include <linux/initrd.h>
34 #include <linux/bootmem.h>
35 #include <linux/root_dev.h>
36 #include <linux/console.h>
37 #include <linux/kernel_stat.h>
38 #include <linux/device.h>
39 #include <linux/notifier.h>
40 #include <linux/pfn.h>
41 #include <linux/ctype.h>
42 #include <linux/reboot.h>
43 #include <linux/topology.h>
44 #include <linux/kexec.h>
45 #include <linux/crash_dump.h>
46 #include <linux/memory.h>
47 #include <linux/compat.h>
50 #include <asm/facility.h>
52 #include <asm/mmu_context.h>
53 #include <asm/cpcmd.h>
54 #include <asm/lowcore.h>
57 #include <asm/ptrace.h>
58 #include <asm/sections.h>
59 #include <asm/ebcdic.h>
60 #include <asm/kvm_virtio.h>
62 #include <asm/os_info.h>
64 #include <asm/sysinfo.h>
70 unsigned int console_mode = 0;
71 EXPORT_SYMBOL(console_mode);
73 unsigned int console_devno = -1;
74 EXPORT_SYMBOL(console_devno);
76 unsigned int console_irq = -1;
77 EXPORT_SYMBOL(console_irq);
79 unsigned long elf_hwcap = 0;
80 char elf_platform[ELF_PLATFORM_SIZE];
82 int __initdata memory_end_set;
83 unsigned long __initdata memory_end;
84 unsigned long __initdata max_physmem_end;
86 unsigned long VMALLOC_START;
87 EXPORT_SYMBOL(VMALLOC_START);
89 unsigned long VMALLOC_END;
90 EXPORT_SYMBOL(VMALLOC_END);
93 EXPORT_SYMBOL(vmemmap);
96 unsigned long MODULES_VADDR;
97 unsigned long MODULES_END;
100 /* An array with a pointer to the lowcore of every CPU. */
101 struct _lowcore *lowcore_ptr[NR_CPUS];
102 EXPORT_SYMBOL(lowcore_ptr);
105 * This is set up by the setup-routine at boot-time
106 * for S390 need to find out, what we have to setup
107 * using address 0x10400 ...
110 #include <asm/setup.h>
113 * condev= and conmode= setup parameter.
116 static int __init condev_setup(char *str)
120 vdev = simple_strtoul(str, &str, 0);
121 if (vdev >= 0 && vdev < 65536) {
122 console_devno = vdev;
128 __setup("condev=", condev_setup);
130 static void __init set_preferred_console(void)
132 if (MACHINE_IS_KVM) {
133 if (sclp_has_vt220())
134 add_preferred_console("ttyS", 1, NULL);
135 else if (sclp_has_linemode())
136 add_preferred_console("ttyS", 0, NULL);
138 add_preferred_console("hvc", 0, NULL);
139 } else if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
140 add_preferred_console("ttyS", 0, NULL);
141 else if (CONSOLE_IS_3270)
142 add_preferred_console("tty3270", 0, NULL);
145 static int __init conmode_setup(char *str)
147 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
148 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
151 #if defined(CONFIG_TN3215_CONSOLE)
152 if (strncmp(str, "3215", 5) == 0)
155 #if defined(CONFIG_TN3270_CONSOLE)
156 if (strncmp(str, "3270", 5) == 0)
159 set_preferred_console();
163 __setup("conmode=", conmode_setup);
165 static void __init conmode_default(void)
167 char query_buffer[1024];
171 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
172 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
173 ptr = strstr(query_buffer, "SUBCHANNEL =");
174 console_irq = simple_strtoul(ptr + 13, NULL, 16);
175 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
176 ptr = strstr(query_buffer, "CONMODE");
178 * Set the conmode to 3215 so that the device recognition
179 * will set the cu_type of the console to 3215. If the
180 * conmode is 3270 and we don't set it back then both
181 * 3215 and the 3270 driver will try to access the console
182 * device (3215 as console and 3270 as normal tty).
184 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
186 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
191 if (strncmp(ptr + 8, "3270", 4) == 0) {
192 #if defined(CONFIG_TN3270_CONSOLE)
194 #elif defined(CONFIG_TN3215_CONSOLE)
196 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
199 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
200 #if defined(CONFIG_TN3215_CONSOLE)
202 #elif defined(CONFIG_TN3270_CONSOLE)
204 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
209 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
215 #ifdef CONFIG_CRASH_DUMP
216 static void __init setup_zfcpdump(void)
218 if (ipl_info.type != IPL_TYPE_FCP_DUMP)
222 strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev");
223 console_loglevel = 2;
226 static inline void setup_zfcpdump(void) {}
227 #endif /* CONFIG_CRASH_DUMP */
230 * Reboot, halt and power_off stubs. They just call _machine_restart,
231 * _machine_halt or _machine_power_off.
234 void machine_restart(char *command)
236 if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
238 * Only unblank the console if we are called in enabled
239 * context or a bust_spinlocks cleared the way for us.
242 _machine_restart(command);
245 void machine_halt(void)
247 if (!in_interrupt() || oops_in_progress)
249 * Only unblank the console if we are called in enabled
250 * context or a bust_spinlocks cleared the way for us.
256 void machine_power_off(void)
258 if (!in_interrupt() || oops_in_progress)
260 * Only unblank the console if we are called in enabled
261 * context or a bust_spinlocks cleared the way for us.
264 _machine_power_off();
268 * Dummy power off function.
270 void (*pm_power_off)(void) = machine_power_off;
271 EXPORT_SYMBOL_GPL(pm_power_off);
273 static int __init early_parse_mem(char *p)
275 memory_end = memparse(p, &p);
276 memory_end &= PAGE_MASK;
280 early_param("mem", early_parse_mem);
282 static int __init parse_vmalloc(char *arg)
286 VMALLOC_END = (memparse(arg, &arg) + PAGE_SIZE - 1) & PAGE_MASK;
289 early_param("vmalloc", parse_vmalloc);
291 void *restart_stack __attribute__((__section__(".data")));
293 static void __init setup_lowcore(void)
298 * Setup lowcore for boot cpu
300 BUILD_BUG_ON(sizeof(struct _lowcore) != LC_PAGES * 4096);
301 lc = __alloc_bootmem_low(LC_PAGES * PAGE_SIZE, LC_PAGES * PAGE_SIZE, 0);
302 lc->restart_psw.mask = PSW_KERNEL_BITS;
303 lc->restart_psw.addr =
304 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
305 lc->external_new_psw.mask = PSW_KERNEL_BITS |
306 PSW_MASK_DAT | PSW_MASK_MCHECK;
307 lc->external_new_psw.addr =
308 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
309 lc->svc_new_psw.mask = PSW_KERNEL_BITS |
310 PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
311 lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
312 lc->program_new_psw.mask = PSW_KERNEL_BITS |
313 PSW_MASK_DAT | PSW_MASK_MCHECK;
314 lc->program_new_psw.addr =
315 PSW_ADDR_AMODE | (unsigned long) pgm_check_handler;
316 lc->mcck_new_psw.mask = PSW_KERNEL_BITS;
317 lc->mcck_new_psw.addr =
318 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
319 lc->io_new_psw.mask = PSW_KERNEL_BITS |
320 PSW_MASK_DAT | PSW_MASK_MCHECK;
321 lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
322 lc->clock_comparator = -1ULL;
323 lc->kernel_stack = ((unsigned long) &init_thread_union)
324 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
325 lc->async_stack = (unsigned long)
326 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0)
327 + ASYNC_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
328 lc->panic_stack = (unsigned long)
329 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0)
330 + PAGE_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
331 lc->current_task = (unsigned long) init_thread_union.thread_info.task;
332 lc->thread_info = (unsigned long) &init_thread_union;
333 lc->machine_flags = S390_lowcore.machine_flags;
334 lc->stfl_fac_list = S390_lowcore.stfl_fac_list;
335 memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
338 if (MACHINE_HAS_IEEE) {
339 lc->extended_save_area_addr = (__u32)
340 __alloc_bootmem_low(PAGE_SIZE, PAGE_SIZE, 0);
341 /* enable extended save area */
342 __ctl_set_bit(14, 29);
346 lc->vector_save_area_addr =
347 (unsigned long) &lc->vector_save_area;
348 lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0];
350 lc->sync_enter_timer = S390_lowcore.sync_enter_timer;
351 lc->async_enter_timer = S390_lowcore.async_enter_timer;
352 lc->exit_timer = S390_lowcore.exit_timer;
353 lc->user_timer = S390_lowcore.user_timer;
354 lc->system_timer = S390_lowcore.system_timer;
355 lc->steal_timer = S390_lowcore.steal_timer;
356 lc->last_update_timer = S390_lowcore.last_update_timer;
357 lc->last_update_clock = S390_lowcore.last_update_clock;
359 restart_stack = __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0);
360 restart_stack += ASYNC_SIZE;
363 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant
364 * restart data to the absolute zero lowcore. This is necessary if
365 * PSW restart is done on an offline CPU that has lowcore zero.
367 lc->restart_stack = (unsigned long) restart_stack;
368 lc->restart_fn = (unsigned long) do_restart;
369 lc->restart_data = 0;
370 lc->restart_source = -1UL;
372 /* Setup absolute zero lowcore */
373 mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack);
374 mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn);
375 mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data);
376 mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source);
377 mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw);
380 lc->spinlock_lockval = arch_spin_lockval(0);
383 set_prefix((u32)(unsigned long) lc);
387 static struct resource code_resource = {
388 .name = "Kernel code",
389 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
392 static struct resource data_resource = {
393 .name = "Kernel data",
394 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
397 static struct resource bss_resource = {
398 .name = "Kernel bss",
399 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
402 static struct resource __initdata *standard_resources[] = {
408 static void __init setup_resources(void)
410 struct resource *res, *std_res, *sub_res;
411 struct memblock_region *reg;
414 code_resource.start = (unsigned long) &_text;
415 code_resource.end = (unsigned long) &_etext - 1;
416 data_resource.start = (unsigned long) &_etext;
417 data_resource.end = (unsigned long) &_edata - 1;
418 bss_resource.start = (unsigned long) &__bss_start;
419 bss_resource.end = (unsigned long) &__bss_stop - 1;
421 for_each_memblock(memory, reg) {
422 res = alloc_bootmem_low(sizeof(*res));
423 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
425 res->name = "System RAM";
426 res->start = reg->base;
427 res->end = reg->base + reg->size - 1;
428 request_resource(&iomem_resource, res);
430 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
431 std_res = standard_resources[j];
432 if (std_res->start < res->start ||
433 std_res->start > res->end)
435 if (std_res->end > res->end) {
436 sub_res = alloc_bootmem_low(sizeof(*sub_res));
438 sub_res->end = res->end;
439 std_res->start = res->end + 1;
440 request_resource(res, sub_res);
442 request_resource(res, std_res);
448 static void __init setup_memory_end(void)
450 unsigned long vmax, vmalloc_size, tmp;
452 /* Choose kernel address space layout: 2, 3, or 4 levels. */
454 vmalloc_size = VMALLOC_END ?: (128UL << 30) - MODULES_LEN;
455 tmp = (memory_end ?: max_physmem_end) / PAGE_SIZE;
456 tmp = tmp * (sizeof(struct page) + PAGE_SIZE);
457 if (tmp + vmalloc_size + MODULES_LEN <= (1UL << 42))
458 vmax = 1UL << 42; /* 3-level kernel page table */
460 vmax = 1UL << 53; /* 4-level kernel page table */
461 /* module area is at the end of the kernel address space. */
463 MODULES_VADDR = MODULES_END - MODULES_LEN;
464 VMALLOC_END = MODULES_VADDR;
466 vmalloc_size = VMALLOC_END ?: 96UL << 20;
467 vmax = 1UL << 31; /* 2-level kernel page table */
468 /* vmalloc area is at the end of the kernel address space. */
471 VMALLOC_START = vmax - vmalloc_size;
473 /* Split remaining virtual space between 1:1 mapping & vmemmap array */
474 tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page));
475 /* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */
476 tmp = SECTION_ALIGN_UP(tmp);
477 tmp = VMALLOC_START - tmp * sizeof(struct page);
478 tmp &= ~((vmax >> 11) - 1); /* align to page table level */
479 tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS);
480 vmemmap = (struct page *) tmp;
482 /* Take care that memory_end is set and <= vmemmap */
483 memory_end = min(memory_end ?: max_physmem_end, tmp);
484 max_pfn = max_low_pfn = PFN_DOWN(memory_end);
485 memblock_remove(memory_end, ULONG_MAX);
487 pr_notice("Max memory size: %luMB\n", memory_end >> 20);
490 static void __init setup_vmcoreinfo(void)
492 mem_assign_absolute(S390_lowcore.vmcore_info, paddr_vmcoreinfo_note());
495 #ifdef CONFIG_CRASH_DUMP
498 * When kdump is enabled, we have to ensure that no memory from
499 * the area [0 - crashkernel memory size] and
500 * [crashk_res.start - crashk_res.end] is set offline.
502 static int kdump_mem_notifier(struct notifier_block *nb,
503 unsigned long action, void *data)
505 struct memory_notify *arg = data;
507 if (action != MEM_GOING_OFFLINE)
509 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
511 if (arg->start_pfn > PFN_DOWN(crashk_res.end))
513 if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start))
518 static struct notifier_block kdump_mem_nb = {
519 .notifier_call = kdump_mem_notifier,
525 * Make sure that the area behind memory_end is protected
527 static void reserve_memory_end(void)
529 #ifdef CONFIG_CRASH_DUMP
530 if (ipl_info.type == IPL_TYPE_FCP_DUMP &&
531 !OLDMEM_BASE && sclp_get_hsa_size()) {
532 memory_end = sclp_get_hsa_size();
533 memory_end &= PAGE_MASK;
539 memblock_reserve(memory_end, ULONG_MAX);
543 * Make sure that oldmem, where the dump is stored, is protected
545 static void reserve_oldmem(void)
547 #ifdef CONFIG_CRASH_DUMP
549 /* Forget all memory above the running kdump system */
550 memblock_reserve(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX);
555 * Make sure that oldmem, where the dump is stored, is protected
557 static void remove_oldmem(void)
559 #ifdef CONFIG_CRASH_DUMP
561 /* Forget all memory above the running kdump system */
562 memblock_remove(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX);
567 * Reserve memory for kdump kernel to be loaded with kexec
569 static void __init reserve_crashkernel(void)
571 #ifdef CONFIG_CRASH_DUMP
572 unsigned long long crash_base, crash_size;
573 phys_addr_t low, high;
576 rc = parse_crashkernel(boot_command_line, memory_end, &crash_size,
579 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
580 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
581 if (rc || crash_size == 0)
584 if (memblock.memory.regions[0].size < crash_size) {
585 pr_info("crashkernel reservation failed: %s\n",
586 "first memory chunk must be at least crashkernel size");
590 low = crash_base ?: OLDMEM_BASE;
591 high = low + crash_size;
592 if (low >= OLDMEM_BASE && high <= OLDMEM_BASE + OLDMEM_SIZE) {
593 /* The crashkernel fits into OLDMEM, reuse OLDMEM */
596 /* Find suitable area in free memory */
597 low = max_t(unsigned long, crash_size, sclp_get_hsa_size());
598 high = crash_base ? crash_base + crash_size : ULONG_MAX;
600 if (crash_base && crash_base < low) {
601 pr_info("crashkernel reservation failed: %s\n",
602 "crash_base too low");
605 low = crash_base ?: low;
606 crash_base = memblock_find_in_range(low, high, crash_size,
607 KEXEC_CRASH_MEM_ALIGN);
611 pr_info("crashkernel reservation failed: %s\n",
612 "no suitable area found");
616 if (register_memory_notifier(&kdump_mem_nb))
619 if (!OLDMEM_BASE && MACHINE_IS_VM)
620 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
621 crashk_res.start = crash_base;
622 crashk_res.end = crash_base + crash_size - 1;
623 insert_resource(&iomem_resource, &crashk_res);
624 memblock_remove(crash_base, crash_size);
625 pr_info("Reserving %lluMB of memory at %lluMB "
626 "for crashkernel (System RAM: %luMB)\n",
627 crash_size >> 20, crash_base >> 20,
628 (unsigned long)memblock.memory.total_size >> 20);
629 os_info_crashkernel_add(crash_base, crash_size);
634 * Reserve the initrd from being used by memblock
636 static void __init reserve_initrd(void)
638 #ifdef CONFIG_BLK_DEV_INITRD
639 initrd_start = INITRD_START;
640 initrd_end = initrd_start + INITRD_SIZE;
641 memblock_reserve(INITRD_START, INITRD_SIZE);
646 * Check for initrd being in usable memory
648 static void __init check_initrd(void)
650 #ifdef CONFIG_BLK_DEV_INITRD
651 if (INITRD_START && INITRD_SIZE &&
652 !memblock_is_region_memory(INITRD_START, INITRD_SIZE)) {
653 pr_err("initrd does not fit memory.\n");
654 memblock_free(INITRD_START, INITRD_SIZE);
655 initrd_start = initrd_end = 0;
661 * Reserve all kernel text
663 static void __init reserve_kernel(void)
665 unsigned long start_pfn;
666 start_pfn = PFN_UP(__pa(&_end));
669 * Reserve memory used for lowcore/command line/kernel image.
671 memblock_reserve(0, (unsigned long)_ehead);
672 memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn)
673 - (unsigned long)_stext);
676 static void __init reserve_elfcorehdr(void)
678 #ifdef CONFIG_CRASH_DUMP
679 if (is_kdump_kernel())
680 memblock_reserve(elfcorehdr_addr - OLDMEM_BASE,
681 PAGE_ALIGN(elfcorehdr_size));
685 static void __init setup_memory(void)
687 struct memblock_region *reg;
690 * Init storage key for present memory
692 for_each_memblock(memory, reg) {
693 storage_key_init_range(reg->base, reg->base + reg->size);
695 psw_set_key(PAGE_DEFAULT_KEY);
698 memblock_enforce_memory_limit(memblock_end_of_DRAM());
702 * Setup hardware capabilities.
704 static void __init setup_hwcaps(void)
706 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
711 * The store facility list bits numbers as found in the principles
712 * of operation are numbered with bit 1UL<<31 as number 0 to
713 * bit 1UL<<0 as number 31.
714 * Bit 0: instructions named N3, "backported" to esa-mode
715 * Bit 2: z/Architecture mode is active
716 * Bit 7: the store-facility-list-extended facility is installed
717 * Bit 17: the message-security assist is installed
718 * Bit 19: the long-displacement facility is installed
719 * Bit 21: the extended-immediate facility is installed
720 * Bit 22: extended-translation facility 3 is installed
721 * Bit 30: extended-translation facility 3 enhancement facility
722 * These get translated to:
723 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
724 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
725 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
726 * HWCAP_S390_ETF3EH bit 8 (22 && 30).
728 for (i = 0; i < 6; i++)
729 if (test_facility(stfl_bits[i]))
730 elf_hwcap |= 1UL << i;
732 if (test_facility(22) && test_facility(30))
733 elf_hwcap |= HWCAP_S390_ETF3EH;
736 * Check for additional facilities with store-facility-list-extended.
737 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
738 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
739 * as stored by stfl, bits 32-xxx contain additional facilities.
740 * How many facility words are stored depends on the number of
741 * doublewords passed to the instruction. The additional facilities
743 * Bit 42: decimal floating point facility is installed
744 * Bit 44: perform floating point operation facility is installed
746 * HWCAP_S390_DFP bit 6 (42 && 44).
748 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
749 elf_hwcap |= HWCAP_S390_DFP;
752 * Huge page support HWCAP_S390_HPAGE is bit 7.
754 if (MACHINE_HAS_HPAGE)
755 elf_hwcap |= HWCAP_S390_HPAGE;
757 #if defined(CONFIG_64BIT)
759 * 64-bit register support for 31-bit processes
760 * HWCAP_S390_HIGH_GPRS is bit 9.
762 elf_hwcap |= HWCAP_S390_HIGH_GPRS;
765 * Transactional execution support HWCAP_S390_TE is bit 10.
767 if (test_facility(50) && test_facility(73))
768 elf_hwcap |= HWCAP_S390_TE;
771 * Vector extension HWCAP_S390_VXRS is bit 11.
773 if (test_facility(129))
774 elf_hwcap |= HWCAP_S390_VXRS;
778 add_device_randomness(&cpu_id, sizeof(cpu_id));
779 switch (cpu_id.machine) {
781 #if !defined(CONFIG_64BIT)
782 default: /* Use "g5" as default for 31 bit kernels. */
784 strcpy(elf_platform, "g5");
788 #if defined(CONFIG_64BIT)
789 default: /* Use "z900" as default for 64 bit kernels. */
791 strcpy(elf_platform, "z900");
795 strcpy(elf_platform, "z990");
799 strcpy(elf_platform, "z9-109");
803 strcpy(elf_platform, "z10");
807 strcpy(elf_platform, "z196");
811 strcpy(elf_platform, "zEC12");
817 * Add system information as device randomness
819 static void __init setup_randomness(void)
821 struct sysinfo_3_2_2 *vmms;
823 vmms = (struct sysinfo_3_2_2 *) alloc_page(GFP_KERNEL);
824 if (vmms && stsi(vmms, 3, 2, 2) == 0 && vmms->count)
825 add_device_randomness(&vmms, vmms->count);
826 free_page((unsigned long) vmms);
830 * Setup function called from init/main.c just after the banner
834 void __init setup_arch(char **cmdline_p)
837 * print what head.S has found out about the machine
841 pr_info("Linux is running as a z/VM "
842 "guest operating system in 31-bit mode\n");
843 else if (MACHINE_IS_LPAR)
844 pr_info("Linux is running natively in 31-bit mode\n");
845 if (MACHINE_HAS_IEEE)
846 pr_info("The hardware system has IEEE compatible "
847 "floating point units\n");
849 pr_info("The hardware system has no IEEE compatible "
850 "floating point units\n");
851 #else /* CONFIG_64BIT */
853 pr_info("Linux is running as a z/VM "
854 "guest operating system in 64-bit mode\n");
855 else if (MACHINE_IS_KVM)
856 pr_info("Linux is running under KVM in 64-bit mode\n");
857 else if (MACHINE_IS_LPAR)
858 pr_info("Linux is running natively in 64-bit mode\n");
859 #endif /* CONFIG_64BIT */
861 /* Have one command line that is parsed and saved in /proc/cmdline */
862 /* boot_command_line has been already set up in early.c */
863 *cmdline_p = boot_command_line;
865 ROOT_DEV = Root_RAM0;
867 /* Is init_mm really needed? */
868 init_mm.start_code = PAGE_OFFSET;
869 init_mm.end_code = (unsigned long) &_etext;
870 init_mm.end_data = (unsigned long) &_edata;
871 init_mm.brk = (unsigned long) &_end;
877 /* Do some memory reservations *before* memory is added to memblock */
878 reserve_memory_end();
882 reserve_elfcorehdr();
883 memblock_allow_resize();
885 /* Get information about *all* installed memory */
886 detect_memory_memblock();
891 * Make sure all chunks are MAX_ORDER aligned so we don't need the
892 * extra checks that HOLES_IN_ZONE would require.
894 * Is this still required?
896 memblock_trim_memory(1UL << (MAX_ORDER - 1 + PAGE_SHIFT));
902 reserve_crashkernel();
907 smp_fill_possible_mask();
909 s390_init_cpu_topology();
912 * Setup capabilities (ELF_HWCAP & ELF_PLATFORM).
917 * Create kernel page tables and switch to virtual addressing.
921 /* Setup default console */
923 set_preferred_console();
925 /* Setup zfcpdump support */
928 /* Add system specific data to the random pool */
933 static int no_removal_warning __initdata;
935 static int __init parse_no_removal_warning(char *str)
937 no_removal_warning = 1;
940 __setup("no_removal_warning", parse_no_removal_warning);
942 static int __init removal_warning(void)
944 if (no_removal_warning)
946 printk(KERN_ALERT "\n\n");
947 printk(KERN_CONT "Warning - you are using a 31 bit kernel!\n\n");
948 printk(KERN_CONT "We plan to remove 31 bit kernel support from the kernel sources in March 2015.\n");
949 printk(KERN_CONT "Currently we assume that nobody is using the 31 bit kernel on old 31 bit\n");
950 printk(KERN_CONT "hardware anymore. If you think that the code should not be removed and also\n");
951 printk(KERN_CONT "future versions of the Linux kernel should be able to run in 31 bit mode\n");
952 printk(KERN_CONT "please let us know. Please write to:\n");
953 printk(KERN_CONT "linux390@de.ibm.com (mail address) and/or\n");
954 printk(KERN_CONT "linux-s390@vger.kernel.org (mailing list).\n\n");
955 printk(KERN_CONT "Thank you!\n\n");
956 printk(KERN_CONT "If this kernel runs on a 64 bit machine you may consider using a 64 bit kernel.\n");
957 printk(KERN_CONT "This message can be disabled with the \"no_removal_warning\" kernel parameter.\n");
958 schedule_timeout_uninterruptible(300 * HZ);
961 early_initcall(removal_warning);