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/user.h>
28 #include <linux/tty.h>
29 #include <linux/ioport.h>
30 #include <linux/delay.h>
31 #include <linux/init.h>
32 #include <linux/initrd.h>
33 #include <linux/bootmem.h>
34 #include <linux/root_dev.h>
35 #include <linux/console.h>
36 #include <linux/kernel_stat.h>
37 #include <linux/device.h>
38 #include <linux/notifier.h>
39 #include <linux/pfn.h>
40 #include <linux/ctype.h>
41 #include <linux/reboot.h>
42 #include <linux/topology.h>
43 #include <linux/ftrace.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>
69 unsigned int console_mode = 0;
70 EXPORT_SYMBOL(console_mode);
72 unsigned int console_devno = -1;
73 EXPORT_SYMBOL(console_devno);
75 unsigned int console_irq = -1;
76 EXPORT_SYMBOL(console_irq);
78 unsigned long elf_hwcap = 0;
79 char elf_platform[ELF_PLATFORM_SIZE];
81 int __initdata memory_end_set;
82 unsigned long __initdata memory_end;
83 unsigned long __initdata max_physmem_end;
85 unsigned long VMALLOC_START;
86 EXPORT_SYMBOL(VMALLOC_START);
88 unsigned long VMALLOC_END;
89 EXPORT_SYMBOL(VMALLOC_END);
92 EXPORT_SYMBOL(vmemmap);
95 unsigned long MODULES_VADDR;
96 unsigned long MODULES_END;
99 /* An array with a pointer to the lowcore of every CPU. */
100 struct _lowcore *lowcore_ptr[NR_CPUS];
101 EXPORT_SYMBOL(lowcore_ptr);
104 * This is set up by the setup-routine at boot-time
105 * for S390 need to find out, what we have to setup
106 * using address 0x10400 ...
109 #include <asm/setup.h>
112 * condev= and conmode= setup parameter.
115 static int __init condev_setup(char *str)
119 vdev = simple_strtoul(str, &str, 0);
120 if (vdev >= 0 && vdev < 65536) {
121 console_devno = vdev;
127 __setup("condev=", condev_setup);
129 static void __init set_preferred_console(void)
131 if (MACHINE_IS_KVM) {
132 if (sclp_has_vt220())
133 add_preferred_console("ttyS", 1, NULL);
134 else if (sclp_has_linemode())
135 add_preferred_console("ttyS", 0, NULL);
137 add_preferred_console("hvc", 0, NULL);
138 } else if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
139 add_preferred_console("ttyS", 0, NULL);
140 else if (CONSOLE_IS_3270)
141 add_preferred_console("tty3270", 0, NULL);
144 static int __init conmode_setup(char *str)
146 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
147 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
150 #if defined(CONFIG_TN3215_CONSOLE)
151 if (strncmp(str, "3215", 5) == 0)
154 #if defined(CONFIG_TN3270_CONSOLE)
155 if (strncmp(str, "3270", 5) == 0)
158 set_preferred_console();
162 __setup("conmode=", conmode_setup);
164 static void __init conmode_default(void)
166 char query_buffer[1024];
170 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
171 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
172 ptr = strstr(query_buffer, "SUBCHANNEL =");
173 console_irq = simple_strtoul(ptr + 13, NULL, 16);
174 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
175 ptr = strstr(query_buffer, "CONMODE");
177 * Set the conmode to 3215 so that the device recognition
178 * will set the cu_type of the console to 3215. If the
179 * conmode is 3270 and we don't set it back then both
180 * 3215 and the 3270 driver will try to access the console
181 * device (3215 as console and 3270 as normal tty).
183 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
185 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
190 if (strncmp(ptr + 8, "3270", 4) == 0) {
191 #if defined(CONFIG_TN3270_CONSOLE)
193 #elif defined(CONFIG_TN3215_CONSOLE)
195 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
198 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
199 #if defined(CONFIG_TN3215_CONSOLE)
201 #elif defined(CONFIG_TN3270_CONSOLE)
203 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
208 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
214 #ifdef CONFIG_CRASH_DUMP
215 static void __init setup_zfcpdump(void)
217 if (ipl_info.type != IPL_TYPE_FCP_DUMP)
221 strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev");
222 console_loglevel = 2;
225 static inline void setup_zfcpdump(void) {}
226 #endif /* CONFIG_CRASH_DUMP */
229 * Reboot, halt and power_off stubs. They just call _machine_restart,
230 * _machine_halt or _machine_power_off.
233 void machine_restart(char *command)
235 if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
237 * Only unblank the console if we are called in enabled
238 * context or a bust_spinlocks cleared the way for us.
241 _machine_restart(command);
244 void machine_halt(void)
246 if (!in_interrupt() || oops_in_progress)
248 * Only unblank the console if we are called in enabled
249 * context or a bust_spinlocks cleared the way for us.
255 void machine_power_off(void)
257 if (!in_interrupt() || oops_in_progress)
259 * Only unblank the console if we are called in enabled
260 * context or a bust_spinlocks cleared the way for us.
263 _machine_power_off();
267 * Dummy power off function.
269 void (*pm_power_off)(void) = machine_power_off;
270 EXPORT_SYMBOL_GPL(pm_power_off);
272 static int __init early_parse_mem(char *p)
274 memory_end = memparse(p, &p);
275 memory_end &= PAGE_MASK;
279 early_param("mem", early_parse_mem);
281 static int __init parse_vmalloc(char *arg)
285 VMALLOC_END = (memparse(arg, &arg) + PAGE_SIZE - 1) & PAGE_MASK;
288 early_param("vmalloc", parse_vmalloc);
290 void *restart_stack __attribute__((__section__(".data")));
292 static void __init setup_lowcore(void)
297 * Setup lowcore for boot cpu
299 BUILD_BUG_ON(sizeof(struct _lowcore) != LC_PAGES * 4096);
300 lc = __alloc_bootmem_low(LC_PAGES * PAGE_SIZE, LC_PAGES * PAGE_SIZE, 0);
301 lc->restart_psw.mask = PSW_KERNEL_BITS;
302 lc->restart_psw.addr =
303 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
304 lc->external_new_psw.mask = PSW_KERNEL_BITS |
305 PSW_MASK_DAT | PSW_MASK_MCHECK;
306 lc->external_new_psw.addr =
307 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
308 lc->svc_new_psw.mask = PSW_KERNEL_BITS |
309 PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
310 lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
311 lc->program_new_psw.mask = PSW_KERNEL_BITS |
312 PSW_MASK_DAT | PSW_MASK_MCHECK;
313 lc->program_new_psw.addr =
314 PSW_ADDR_AMODE | (unsigned long) pgm_check_handler;
315 lc->mcck_new_psw.mask = PSW_KERNEL_BITS;
316 lc->mcck_new_psw.addr =
317 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
318 lc->io_new_psw.mask = PSW_KERNEL_BITS |
319 PSW_MASK_DAT | PSW_MASK_MCHECK;
320 lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
321 lc->clock_comparator = -1ULL;
322 lc->kernel_stack = ((unsigned long) &init_thread_union)
323 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
324 lc->async_stack = (unsigned long)
325 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0)
326 + ASYNC_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
327 lc->panic_stack = (unsigned long)
328 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0)
329 + PAGE_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
330 lc->current_task = (unsigned long) init_thread_union.thread_info.task;
331 lc->thread_info = (unsigned long) &init_thread_union;
332 lc->machine_flags = S390_lowcore.machine_flags;
333 lc->stfl_fac_list = S390_lowcore.stfl_fac_list;
334 memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
337 if (MACHINE_HAS_IEEE) {
338 lc->extended_save_area_addr = (__u32)
339 __alloc_bootmem_low(PAGE_SIZE, PAGE_SIZE, 0);
340 /* enable extended save area */
341 __ctl_set_bit(14, 29);
344 lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0];
346 lc->sync_enter_timer = S390_lowcore.sync_enter_timer;
347 lc->async_enter_timer = S390_lowcore.async_enter_timer;
348 lc->exit_timer = S390_lowcore.exit_timer;
349 lc->user_timer = S390_lowcore.user_timer;
350 lc->system_timer = S390_lowcore.system_timer;
351 lc->steal_timer = S390_lowcore.steal_timer;
352 lc->last_update_timer = S390_lowcore.last_update_timer;
353 lc->last_update_clock = S390_lowcore.last_update_clock;
354 lc->ftrace_func = S390_lowcore.ftrace_func;
356 restart_stack = __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0);
357 restart_stack += ASYNC_SIZE;
360 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant
361 * restart data to the absolute zero lowcore. This is necessary if
362 * PSW restart is done on an offline CPU that has lowcore zero.
364 lc->restart_stack = (unsigned long) restart_stack;
365 lc->restart_fn = (unsigned long) do_restart;
366 lc->restart_data = 0;
367 lc->restart_source = -1UL;
369 /* Setup absolute zero lowcore */
370 mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack);
371 mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn);
372 mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data);
373 mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source);
374 mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw);
377 lc->spinlock_lockval = arch_spin_lockval(0);
380 set_prefix((u32)(unsigned long) lc);
384 static struct resource code_resource = {
385 .name = "Kernel code",
386 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
389 static struct resource data_resource = {
390 .name = "Kernel data",
391 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
394 static struct resource bss_resource = {
395 .name = "Kernel bss",
396 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
399 static struct resource __initdata *standard_resources[] = {
405 static void __init setup_resources(void)
407 struct resource *res, *std_res, *sub_res;
408 struct memblock_region *reg;
411 code_resource.start = (unsigned long) &_text;
412 code_resource.end = (unsigned long) &_etext - 1;
413 data_resource.start = (unsigned long) &_etext;
414 data_resource.end = (unsigned long) &_edata - 1;
415 bss_resource.start = (unsigned long) &__bss_start;
416 bss_resource.end = (unsigned long) &__bss_stop - 1;
418 for_each_memblock(memory, reg) {
419 res = alloc_bootmem_low(sizeof(*res));
420 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
422 res->name = "System RAM";
423 res->start = reg->base;
424 res->end = reg->base + reg->size - 1;
425 request_resource(&iomem_resource, res);
427 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
428 std_res = standard_resources[j];
429 if (std_res->start < res->start ||
430 std_res->start > res->end)
432 if (std_res->end > res->end) {
433 sub_res = alloc_bootmem_low(sizeof(*sub_res));
435 sub_res->end = res->end;
436 std_res->start = res->end + 1;
437 request_resource(res, sub_res);
439 request_resource(res, std_res);
445 static void __init setup_memory_end(void)
447 unsigned long vmax, vmalloc_size, tmp;
449 /* Choose kernel address space layout: 2, 3, or 4 levels. */
451 vmalloc_size = VMALLOC_END ?: (128UL << 30) - MODULES_LEN;
452 tmp = (memory_end ?: max_physmem_end) / PAGE_SIZE;
453 tmp = tmp * (sizeof(struct page) + PAGE_SIZE) + vmalloc_size;
454 if (tmp <= (1UL << 42))
455 vmax = 1UL << 42; /* 3-level kernel page table */
457 vmax = 1UL << 53; /* 4-level kernel page table */
458 /* module area is at the end of the kernel address space. */
460 MODULES_VADDR = MODULES_END - MODULES_LEN;
461 VMALLOC_END = MODULES_VADDR;
463 vmalloc_size = VMALLOC_END ?: 96UL << 20;
464 vmax = 1UL << 31; /* 2-level kernel page table */
465 /* vmalloc area is at the end of the kernel address space. */
468 VMALLOC_START = vmax - vmalloc_size;
470 /* Split remaining virtual space between 1:1 mapping & vmemmap array */
471 tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page));
472 /* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */
473 tmp = SECTION_ALIGN_UP(tmp);
474 tmp = VMALLOC_START - tmp * sizeof(struct page);
475 tmp &= ~((vmax >> 11) - 1); /* align to page table level */
476 tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS);
477 vmemmap = (struct page *) tmp;
479 /* Take care that memory_end is set and <= vmemmap */
480 memory_end = min(memory_end ?: max_physmem_end, tmp);
481 max_pfn = max_low_pfn = PFN_DOWN(memory_end);
482 memblock_remove(memory_end, ULONG_MAX);
484 pr_notice("Max memory size: %luMB\n", memory_end >> 20);
487 static void __init setup_vmcoreinfo(void)
489 mem_assign_absolute(S390_lowcore.vmcore_info, paddr_vmcoreinfo_note());
492 #ifdef CONFIG_CRASH_DUMP
495 * When kdump is enabled, we have to ensure that no memory from
496 * the area [0 - crashkernel memory size] and
497 * [crashk_res.start - crashk_res.end] is set offline.
499 static int kdump_mem_notifier(struct notifier_block *nb,
500 unsigned long action, void *data)
502 struct memory_notify *arg = data;
504 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
506 if (arg->start_pfn > PFN_DOWN(crashk_res.end))
508 if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start))
513 static struct notifier_block kdump_mem_nb = {
514 .notifier_call = kdump_mem_notifier,
520 * Make sure that the area behind memory_end is protected
522 static void reserve_memory_end(void)
524 #ifdef CONFIG_CRASH_DUMP
525 if (ipl_info.type == IPL_TYPE_FCP_DUMP &&
526 !OLDMEM_BASE && sclp_get_hsa_size()) {
527 memory_end = sclp_get_hsa_size();
528 memory_end &= PAGE_MASK;
534 memblock_reserve(memory_end, ULONG_MAX);
538 * Make sure that oldmem, where the dump is stored, is protected
540 static void reserve_oldmem(void)
542 #ifdef CONFIG_CRASH_DUMP
544 /* Forget all memory above the running kdump system */
545 memblock_reserve(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX);
550 * Make sure that oldmem, where the dump is stored, is protected
552 static void remove_oldmem(void)
554 #ifdef CONFIG_CRASH_DUMP
556 /* Forget all memory above the running kdump system */
557 memblock_remove(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX);
562 * Reserve memory for kdump kernel to be loaded with kexec
564 static void __init reserve_crashkernel(void)
566 #ifdef CONFIG_CRASH_DUMP
567 unsigned long long crash_base, crash_size;
568 phys_addr_t low, high;
571 rc = parse_crashkernel(boot_command_line, memory_end, &crash_size,
574 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
575 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
576 if (rc || crash_size == 0)
579 if (memblock.memory.regions[0].size < crash_size) {
580 pr_info("crashkernel reservation failed: %s\n",
581 "first memory chunk must be at least crashkernel size");
585 low = crash_base ?: OLDMEM_BASE;
586 high = low + crash_size;
587 if (low >= OLDMEM_BASE && high <= OLDMEM_BASE + OLDMEM_SIZE) {
588 /* The crashkernel fits into OLDMEM, reuse OLDMEM */
591 /* Find suitable area in free memory */
592 low = max_t(unsigned long, crash_size, sclp_get_hsa_size());
593 high = crash_base ? crash_base + crash_size : ULONG_MAX;
595 if (crash_base && crash_base < low) {
596 pr_info("crashkernel reservation failed: %s\n",
597 "crash_base too low");
600 low = crash_base ?: low;
601 crash_base = memblock_find_in_range(low, high, crash_size,
602 KEXEC_CRASH_MEM_ALIGN);
606 pr_info("crashkernel reservation failed: %s\n",
607 "no suitable area found");
611 if (register_memory_notifier(&kdump_mem_nb))
614 if (!OLDMEM_BASE && MACHINE_IS_VM)
615 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
616 crashk_res.start = crash_base;
617 crashk_res.end = crash_base + crash_size - 1;
618 insert_resource(&iomem_resource, &crashk_res);
619 memblock_remove(crash_base, crash_size);
620 pr_info("Reserving %lluMB of memory at %lluMB "
621 "for crashkernel (System RAM: %luMB)\n",
622 crash_size >> 20, crash_base >> 20,
623 (unsigned long)memblock.memory.total_size >> 20);
624 os_info_crashkernel_add(crash_base, crash_size);
629 * Reserve the initrd from being used by memblock
631 static void __init reserve_initrd(void)
633 #ifdef CONFIG_BLK_DEV_INITRD
634 initrd_start = INITRD_START;
635 initrd_end = initrd_start + INITRD_SIZE;
636 memblock_reserve(INITRD_START, INITRD_SIZE);
641 * Check for initrd being in usable memory
643 static void __init check_initrd(void)
645 #ifdef CONFIG_BLK_DEV_INITRD
646 if (INITRD_START && INITRD_SIZE &&
647 !memblock_is_region_memory(INITRD_START, INITRD_SIZE)) {
648 pr_err("initrd does not fit memory.\n");
649 memblock_free(INITRD_START, INITRD_SIZE);
650 initrd_start = initrd_end = 0;
656 * Reserve all kernel text
658 static void __init reserve_kernel(void)
660 unsigned long start_pfn;
661 start_pfn = PFN_UP(__pa(&_end));
664 * Reserve memory used for lowcore/command line/kernel image.
666 memblock_reserve(0, (unsigned long)_ehead);
667 memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn)
668 - (unsigned long)_stext);
671 static void __init reserve_elfcorehdr(void)
673 #ifdef CONFIG_CRASH_DUMP
674 if (is_kdump_kernel())
675 memblock_reserve(elfcorehdr_addr - OLDMEM_BASE,
676 PAGE_ALIGN(elfcorehdr_size));
680 static void __init setup_memory(void)
682 struct memblock_region *reg;
685 * Init storage key for present memory
687 for_each_memblock(memory, reg) {
688 storage_key_init_range(reg->base, reg->base + reg->size);
690 psw_set_key(PAGE_DEFAULT_KEY);
693 memblock_enforce_memory_limit(memblock_end_of_DRAM());
697 * Setup hardware capabilities.
699 static void __init setup_hwcaps(void)
701 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
706 * The store facility list bits numbers as found in the principles
707 * of operation are numbered with bit 1UL<<31 as number 0 to
708 * bit 1UL<<0 as number 31.
709 * Bit 0: instructions named N3, "backported" to esa-mode
710 * Bit 2: z/Architecture mode is active
711 * Bit 7: the store-facility-list-extended facility is installed
712 * Bit 17: the message-security assist is installed
713 * Bit 19: the long-displacement facility is installed
714 * Bit 21: the extended-immediate facility is installed
715 * Bit 22: extended-translation facility 3 is installed
716 * Bit 30: extended-translation facility 3 enhancement facility
717 * These get translated to:
718 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
719 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
720 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
721 * HWCAP_S390_ETF3EH bit 8 (22 && 30).
723 for (i = 0; i < 6; i++)
724 if (test_facility(stfl_bits[i]))
725 elf_hwcap |= 1UL << i;
727 if (test_facility(22) && test_facility(30))
728 elf_hwcap |= HWCAP_S390_ETF3EH;
731 * Check for additional facilities with store-facility-list-extended.
732 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
733 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
734 * as stored by stfl, bits 32-xxx contain additional facilities.
735 * How many facility words are stored depends on the number of
736 * doublewords passed to the instruction. The additional facilities
738 * Bit 42: decimal floating point facility is installed
739 * Bit 44: perform floating point operation facility is installed
741 * HWCAP_S390_DFP bit 6 (42 && 44).
743 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
744 elf_hwcap |= HWCAP_S390_DFP;
747 * Huge page support HWCAP_S390_HPAGE is bit 7.
749 if (MACHINE_HAS_HPAGE)
750 elf_hwcap |= HWCAP_S390_HPAGE;
752 #if defined(CONFIG_64BIT)
754 * 64-bit register support for 31-bit processes
755 * HWCAP_S390_HIGH_GPRS is bit 9.
757 elf_hwcap |= HWCAP_S390_HIGH_GPRS;
760 * Transactional execution support HWCAP_S390_TE is bit 10.
762 if (test_facility(50) && test_facility(73))
763 elf_hwcap |= HWCAP_S390_TE;
767 switch (cpu_id.machine) {
769 #if !defined(CONFIG_64BIT)
770 default: /* Use "g5" as default for 31 bit kernels. */
772 strcpy(elf_platform, "g5");
776 #if defined(CONFIG_64BIT)
777 default: /* Use "z900" as default for 64 bit kernels. */
779 strcpy(elf_platform, "z900");
783 strcpy(elf_platform, "z990");
787 strcpy(elf_platform, "z9-109");
791 strcpy(elf_platform, "z10");
795 strcpy(elf_platform, "z196");
799 strcpy(elf_platform, "zEC12");
805 * Setup function called from init/main.c just after the banner
809 void __init setup_arch(char **cmdline_p)
812 * print what head.S has found out about the machine
816 pr_info("Linux is running as a z/VM "
817 "guest operating system in 31-bit mode\n");
818 else if (MACHINE_IS_LPAR)
819 pr_info("Linux is running natively in 31-bit mode\n");
820 if (MACHINE_HAS_IEEE)
821 pr_info("The hardware system has IEEE compatible "
822 "floating point units\n");
824 pr_info("The hardware system has no IEEE compatible "
825 "floating point units\n");
826 #else /* CONFIG_64BIT */
828 pr_info("Linux is running as a z/VM "
829 "guest operating system in 64-bit mode\n");
830 else if (MACHINE_IS_KVM)
831 pr_info("Linux is running under KVM in 64-bit mode\n");
832 else if (MACHINE_IS_LPAR)
833 pr_info("Linux is running natively in 64-bit mode\n");
834 #endif /* CONFIG_64BIT */
836 /* Have one command line that is parsed and saved in /proc/cmdline */
837 /* boot_command_line has been already set up in early.c */
838 *cmdline_p = boot_command_line;
840 ROOT_DEV = Root_RAM0;
842 /* Is init_mm really needed? */
843 init_mm.start_code = PAGE_OFFSET;
844 init_mm.end_code = (unsigned long) &_etext;
845 init_mm.end_data = (unsigned long) &_edata;
846 init_mm.brk = (unsigned long) &_end;
852 /* Do some memory reservations *before* memory is added to memblock */
853 reserve_memory_end();
857 reserve_elfcorehdr();
858 memblock_allow_resize();
860 /* Get information about *all* installed memory */
861 detect_memory_memblock();
866 * Make sure all chunks are MAX_ORDER aligned so we don't need the
867 * extra checks that HOLES_IN_ZONE would require.
869 * Is this still required?
871 memblock_trim_memory(1UL << (MAX_ORDER - 1 + PAGE_SHIFT));
877 reserve_crashkernel();
882 smp_fill_possible_mask();
884 s390_init_cpu_topology();
887 * Setup capabilities (ELF_HWCAP & ELF_PLATFORM).
892 * Create kernel page tables and switch to virtual addressing.
896 /* Setup default console */
898 set_preferred_console();
900 /* Setup zfcpdump support */
905 static int no_removal_warning __initdata;
907 static int __init parse_no_removal_warning(char *str)
909 no_removal_warning = 1;
912 __setup("no_removal_warning", parse_no_removal_warning);
914 static int __init removal_warning(void)
916 if (no_removal_warning)
918 printk(KERN_ALERT "\n\n");
919 printk(KERN_CONT "Warning - you are using a 31 bit kernel!\n\n");
920 printk(KERN_CONT "We plan to remove 31 bit kernel support from the kernel sources in March 2015.\n");
921 printk(KERN_CONT "Currently we assume that nobody is using the 31 bit kernel on old 31 bit\n");
922 printk(KERN_CONT "hardware anymore. If you think that the code should not be removed and also\n");
923 printk(KERN_CONT "future versions of the Linux kernel should be able to run in 31 bit mode\n");
924 printk(KERN_CONT "please let us know. Please write to:\n");
925 printk(KERN_CONT "linux390@de.ibm.com (mail address) and/or\n");
926 printk(KERN_CONT "linux-s390@vger.kernel.org (mailing list).\n\n");
927 printk(KERN_CONT "Thank you!\n\n");
928 printk(KERN_CONT "If this kernel runs on a 64 bit machine you may consider using a 64 bit kernel.\n");
929 printk(KERN_CONT "This message can be disabled with the \"no_removal_warning\" kernel parameter.\n");
930 schedule_timeout_uninterruptible(300 * HZ);
933 early_initcall(removal_warning);