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>
71 unsigned int console_mode = 0;
72 EXPORT_SYMBOL(console_mode);
74 unsigned int console_devno = -1;
75 EXPORT_SYMBOL(console_devno);
77 unsigned int console_irq = -1;
78 EXPORT_SYMBOL(console_irq);
80 unsigned long elf_hwcap __read_mostly = 0;
81 char elf_platform[ELF_PLATFORM_SIZE];
83 unsigned long int_hwcap = 0;
85 int __initdata memory_end_set;
86 unsigned long __initdata memory_end;
87 unsigned long __initdata max_physmem_end;
89 unsigned long VMALLOC_START;
90 EXPORT_SYMBOL(VMALLOC_START);
92 unsigned long VMALLOC_END;
93 EXPORT_SYMBOL(VMALLOC_END);
96 EXPORT_SYMBOL(vmemmap);
98 unsigned long MODULES_VADDR;
99 unsigned long MODULES_END;
101 /* An array with a pointer to the lowcore of every CPU. */
102 struct lowcore *lowcore_ptr[NR_CPUS];
103 EXPORT_SYMBOL(lowcore_ptr);
106 * This is set up by the setup-routine at boot-time
107 * for S390 need to find out, what we have to setup
108 * using address 0x10400 ...
111 #include <asm/setup.h>
114 * condev= and conmode= setup parameter.
117 static int __init condev_setup(char *str)
121 vdev = simple_strtoul(str, &str, 0);
122 if (vdev >= 0 && vdev < 65536) {
123 console_devno = vdev;
129 __setup("condev=", condev_setup);
131 static void __init set_preferred_console(void)
133 if (MACHINE_IS_KVM) {
135 add_preferred_console("ttyS", 1, NULL);
136 else if (sclp.has_linemode)
137 add_preferred_console("ttyS", 0, NULL);
139 add_preferred_console("hvc", 0, NULL);
140 } else if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
141 add_preferred_console("ttyS", 0, NULL);
142 else if (CONSOLE_IS_3270)
143 add_preferred_console("tty3270", 0, NULL);
146 static int __init conmode_setup(char *str)
148 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
149 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
152 #if defined(CONFIG_TN3215_CONSOLE)
153 if (strncmp(str, "3215", 5) == 0)
156 #if defined(CONFIG_TN3270_CONSOLE)
157 if (strncmp(str, "3270", 5) == 0)
160 set_preferred_console();
164 __setup("conmode=", conmode_setup);
166 static void __init conmode_default(void)
168 char query_buffer[1024];
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");
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).
185 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
187 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
192 if (strncmp(ptr + 8, "3270", 4) == 0) {
193 #if defined(CONFIG_TN3270_CONSOLE)
195 #elif defined(CONFIG_TN3215_CONSOLE)
197 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
200 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
201 #if defined(CONFIG_TN3215_CONSOLE)
203 #elif defined(CONFIG_TN3270_CONSOLE)
205 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
210 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
216 #ifdef CONFIG_CRASH_DUMP
217 static void __init setup_zfcpdump(void)
219 if (ipl_info.type != IPL_TYPE_FCP_DUMP)
223 strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev");
224 console_loglevel = 2;
227 static inline void setup_zfcpdump(void) {}
228 #endif /* CONFIG_CRASH_DUMP */
231 * Reboot, halt and power_off stubs. They just call _machine_restart,
232 * _machine_halt or _machine_power_off.
235 void machine_restart(char *command)
237 if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
239 * Only unblank the console if we are called in enabled
240 * context or a bust_spinlocks cleared the way for us.
243 _machine_restart(command);
246 void machine_halt(void)
248 if (!in_interrupt() || oops_in_progress)
250 * Only unblank the console if we are called in enabled
251 * context or a bust_spinlocks cleared the way for us.
257 void machine_power_off(void)
259 if (!in_interrupt() || oops_in_progress)
261 * Only unblank the console if we are called in enabled
262 * context or a bust_spinlocks cleared the way for us.
265 _machine_power_off();
269 * Dummy power off function.
271 void (*pm_power_off)(void) = machine_power_off;
272 EXPORT_SYMBOL_GPL(pm_power_off);
274 static int __init early_parse_mem(char *p)
276 memory_end = memparse(p, &p);
277 memory_end &= PAGE_MASK;
281 early_param("mem", early_parse_mem);
283 static int __init parse_vmalloc(char *arg)
287 VMALLOC_END = (memparse(arg, &arg) + PAGE_SIZE - 1) & PAGE_MASK;
290 early_param("vmalloc", parse_vmalloc);
292 void *restart_stack __attribute__((__section__(".data")));
294 static void __init setup_lowcore(void)
299 * Setup lowcore for boot cpu
301 BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * 4096);
302 lc = __alloc_bootmem_low(LC_PAGES * PAGE_SIZE, LC_PAGES * PAGE_SIZE, 0);
303 lc->restart_psw.mask = PSW_KERNEL_BITS;
304 lc->restart_psw.addr =
305 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
306 lc->external_new_psw.mask = PSW_KERNEL_BITS |
307 PSW_MASK_DAT | PSW_MASK_MCHECK;
308 lc->external_new_psw.addr =
309 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
310 lc->svc_new_psw.mask = PSW_KERNEL_BITS |
311 PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
312 lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
313 lc->program_new_psw.mask = PSW_KERNEL_BITS |
314 PSW_MASK_DAT | PSW_MASK_MCHECK;
315 lc->program_new_psw.addr =
316 PSW_ADDR_AMODE | (unsigned long) pgm_check_handler;
317 lc->mcck_new_psw.mask = PSW_KERNEL_BITS;
318 lc->mcck_new_psw.addr =
319 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
320 lc->io_new_psw.mask = PSW_KERNEL_BITS |
321 PSW_MASK_DAT | PSW_MASK_MCHECK;
322 lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
323 lc->clock_comparator = -1ULL;
324 lc->kernel_stack = ((unsigned long) &init_thread_union)
325 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
326 lc->async_stack = (unsigned long)
327 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0)
328 + ASYNC_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
329 lc->panic_stack = (unsigned long)
330 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0)
331 + PAGE_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
332 lc->current_task = (unsigned long) init_thread_union.thread_info.task;
333 lc->thread_info = (unsigned long) &init_thread_union;
334 lc->machine_flags = S390_lowcore.machine_flags;
335 lc->stfl_fac_list = S390_lowcore.stfl_fac_list;
336 memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
339 lc->vector_save_area_addr =
340 (unsigned long) &lc->vector_save_area;
341 lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0];
342 lc->sync_enter_timer = S390_lowcore.sync_enter_timer;
343 lc->async_enter_timer = S390_lowcore.async_enter_timer;
344 lc->exit_timer = S390_lowcore.exit_timer;
345 lc->user_timer = S390_lowcore.user_timer;
346 lc->system_timer = S390_lowcore.system_timer;
347 lc->steal_timer = S390_lowcore.steal_timer;
348 lc->last_update_timer = S390_lowcore.last_update_timer;
349 lc->last_update_clock = S390_lowcore.last_update_clock;
351 restart_stack = __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0);
352 restart_stack += ASYNC_SIZE;
355 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant
356 * restart data to the absolute zero lowcore. This is necessary if
357 * PSW restart is done on an offline CPU that has lowcore zero.
359 lc->restart_stack = (unsigned long) restart_stack;
360 lc->restart_fn = (unsigned long) do_restart;
361 lc->restart_data = 0;
362 lc->restart_source = -1UL;
364 /* Setup absolute zero lowcore */
365 mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack);
366 mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn);
367 mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data);
368 mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source);
369 mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw);
372 lc->spinlock_lockval = arch_spin_lockval(0);
375 set_prefix((u32)(unsigned long) lc);
379 static struct resource code_resource = {
380 .name = "Kernel code",
381 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
384 static struct resource data_resource = {
385 .name = "Kernel data",
386 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
389 static struct resource bss_resource = {
390 .name = "Kernel bss",
391 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
394 static struct resource __initdata *standard_resources[] = {
400 static void __init setup_resources(void)
402 struct resource *res, *std_res, *sub_res;
403 struct memblock_region *reg;
406 code_resource.start = (unsigned long) &_text;
407 code_resource.end = (unsigned long) &_etext - 1;
408 data_resource.start = (unsigned long) &_etext;
409 data_resource.end = (unsigned long) &_edata - 1;
410 bss_resource.start = (unsigned long) &__bss_start;
411 bss_resource.end = (unsigned long) &__bss_stop - 1;
413 for_each_memblock(memory, reg) {
414 res = alloc_bootmem_low(sizeof(*res));
415 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
417 res->name = "System RAM";
418 res->start = reg->base;
419 res->end = reg->base + reg->size - 1;
420 request_resource(&iomem_resource, res);
422 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
423 std_res = standard_resources[j];
424 if (std_res->start < res->start ||
425 std_res->start > res->end)
427 if (std_res->end > res->end) {
428 sub_res = alloc_bootmem_low(sizeof(*sub_res));
430 sub_res->end = res->end;
431 std_res->start = res->end + 1;
432 request_resource(res, sub_res);
434 request_resource(res, std_res);
440 static void __init setup_memory_end(void)
442 unsigned long vmax, vmalloc_size, tmp;
444 /* Choose kernel address space layout: 2, 3, or 4 levels. */
445 vmalloc_size = VMALLOC_END ?: (128UL << 30) - MODULES_LEN;
446 tmp = (memory_end ?: max_physmem_end) / PAGE_SIZE;
447 tmp = tmp * (sizeof(struct page) + PAGE_SIZE);
448 if (tmp + vmalloc_size + MODULES_LEN <= (1UL << 42))
449 vmax = 1UL << 42; /* 3-level kernel page table */
451 vmax = 1UL << 53; /* 4-level kernel page table */
452 /* module area is at the end of the kernel address space. */
454 MODULES_VADDR = MODULES_END - MODULES_LEN;
455 VMALLOC_END = MODULES_VADDR;
456 VMALLOC_START = vmax - vmalloc_size;
458 /* Split remaining virtual space between 1:1 mapping & vmemmap array */
459 tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page));
460 /* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */
461 tmp = SECTION_ALIGN_UP(tmp);
462 tmp = VMALLOC_START - tmp * sizeof(struct page);
463 tmp &= ~((vmax >> 11) - 1); /* align to page table level */
464 tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS);
465 vmemmap = (struct page *) tmp;
467 /* Take care that memory_end is set and <= vmemmap */
468 memory_end = min(memory_end ?: max_physmem_end, tmp);
469 max_pfn = max_low_pfn = PFN_DOWN(memory_end);
470 memblock_remove(memory_end, ULONG_MAX);
472 pr_notice("Max memory size: %luMB\n", memory_end >> 20);
475 static void __init setup_vmcoreinfo(void)
477 mem_assign_absolute(S390_lowcore.vmcore_info, paddr_vmcoreinfo_note());
480 #ifdef CONFIG_CRASH_DUMP
483 * When kdump is enabled, we have to ensure that no memory from
484 * the area [0 - crashkernel memory size] and
485 * [crashk_res.start - crashk_res.end] is set offline.
487 static int kdump_mem_notifier(struct notifier_block *nb,
488 unsigned long action, void *data)
490 struct memory_notify *arg = data;
492 if (action != MEM_GOING_OFFLINE)
494 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
496 if (arg->start_pfn > PFN_DOWN(crashk_res.end))
498 if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start))
503 static struct notifier_block kdump_mem_nb = {
504 .notifier_call = kdump_mem_notifier,
510 * Make sure that the area behind memory_end is protected
512 static void reserve_memory_end(void)
514 #ifdef CONFIG_CRASH_DUMP
515 if (ipl_info.type == IPL_TYPE_FCP_DUMP &&
516 !OLDMEM_BASE && sclp.hsa_size) {
517 memory_end = sclp.hsa_size;
518 memory_end &= PAGE_MASK;
524 memblock_reserve(memory_end, ULONG_MAX);
528 * Make sure that oldmem, where the dump is stored, is protected
530 static void reserve_oldmem(void)
532 #ifdef CONFIG_CRASH_DUMP
534 /* Forget all memory above the running kdump system */
535 memblock_reserve(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX);
540 * Make sure that oldmem, where the dump is stored, is protected
542 static void remove_oldmem(void)
544 #ifdef CONFIG_CRASH_DUMP
546 /* Forget all memory above the running kdump system */
547 memblock_remove(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX);
552 * Reserve memory for kdump kernel to be loaded with kexec
554 static void __init reserve_crashkernel(void)
556 #ifdef CONFIG_CRASH_DUMP
557 unsigned long long crash_base, crash_size;
558 phys_addr_t low, high;
561 rc = parse_crashkernel(boot_command_line, memory_end, &crash_size,
564 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
565 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
566 if (rc || crash_size == 0)
569 if (memblock.memory.regions[0].size < crash_size) {
570 pr_info("crashkernel reservation failed: %s\n",
571 "first memory chunk must be at least crashkernel size");
575 low = crash_base ?: OLDMEM_BASE;
576 high = low + crash_size;
577 if (low >= OLDMEM_BASE && high <= OLDMEM_BASE + OLDMEM_SIZE) {
578 /* The crashkernel fits into OLDMEM, reuse OLDMEM */
581 /* Find suitable area in free memory */
582 low = max_t(unsigned long, crash_size, sclp.hsa_size);
583 high = crash_base ? crash_base + crash_size : ULONG_MAX;
585 if (crash_base && crash_base < low) {
586 pr_info("crashkernel reservation failed: %s\n",
587 "crash_base too low");
590 low = crash_base ?: low;
591 crash_base = memblock_find_in_range(low, high, crash_size,
592 KEXEC_CRASH_MEM_ALIGN);
596 pr_info("crashkernel reservation failed: %s\n",
597 "no suitable area found");
601 if (register_memory_notifier(&kdump_mem_nb))
604 if (!OLDMEM_BASE && MACHINE_IS_VM)
605 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
606 crashk_res.start = crash_base;
607 crashk_res.end = crash_base + crash_size - 1;
608 insert_resource(&iomem_resource, &crashk_res);
609 memblock_remove(crash_base, crash_size);
610 pr_info("Reserving %lluMB of memory at %lluMB "
611 "for crashkernel (System RAM: %luMB)\n",
612 crash_size >> 20, crash_base >> 20,
613 (unsigned long)memblock.memory.total_size >> 20);
614 os_info_crashkernel_add(crash_base, crash_size);
619 * Reserve the initrd from being used by memblock
621 static void __init reserve_initrd(void)
623 #ifdef CONFIG_BLK_DEV_INITRD
624 initrd_start = INITRD_START;
625 initrd_end = initrd_start + INITRD_SIZE;
626 memblock_reserve(INITRD_START, INITRD_SIZE);
631 * Check for initrd being in usable memory
633 static void __init check_initrd(void)
635 #ifdef CONFIG_BLK_DEV_INITRD
636 if (INITRD_START && INITRD_SIZE &&
637 !memblock_is_region_memory(INITRD_START, INITRD_SIZE)) {
638 pr_err("initrd does not fit memory.\n");
639 memblock_free(INITRD_START, INITRD_SIZE);
640 initrd_start = initrd_end = 0;
646 * Reserve memory used for lowcore/command line/kernel image.
648 static void __init reserve_kernel(void)
650 unsigned long start_pfn = PFN_UP(__pa(&_end));
652 #ifdef CONFIG_DMA_API_DEBUG
654 * DMA_API_DEBUG code stumbles over addresses from the
655 * range [_ehead, _stext]. Mark the memory as reserved
656 * so it is not used for CONFIG_DMA_API_DEBUG=y.
658 memblock_reserve(0, PFN_PHYS(start_pfn));
660 memblock_reserve(0, (unsigned long)_ehead);
661 memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn)
662 - (unsigned long)_stext);
666 static void __init setup_memory(void)
668 struct memblock_region *reg;
671 * Init storage key for present memory
673 for_each_memblock(memory, reg) {
674 storage_key_init_range(reg->base, reg->base + reg->size);
676 psw_set_key(PAGE_DEFAULT_KEY);
679 memblock_enforce_memory_limit(memblock_end_of_DRAM());
683 * Setup hardware capabilities.
685 static int __init setup_hwcaps(void)
687 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
692 * The store facility list bits numbers as found in the principles
693 * of operation are numbered with bit 1UL<<31 as number 0 to
694 * bit 1UL<<0 as number 31.
695 * Bit 0: instructions named N3, "backported" to esa-mode
696 * Bit 2: z/Architecture mode is active
697 * Bit 7: the store-facility-list-extended facility is installed
698 * Bit 17: the message-security assist is installed
699 * Bit 19: the long-displacement facility is installed
700 * Bit 21: the extended-immediate facility is installed
701 * Bit 22: extended-translation facility 3 is installed
702 * Bit 30: extended-translation facility 3 enhancement facility
703 * These get translated to:
704 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
705 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
706 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
707 * HWCAP_S390_ETF3EH bit 8 (22 && 30).
709 for (i = 0; i < 6; i++)
710 if (test_facility(stfl_bits[i]))
711 elf_hwcap |= 1UL << i;
713 if (test_facility(22) && test_facility(30))
714 elf_hwcap |= HWCAP_S390_ETF3EH;
717 * Check for additional facilities with store-facility-list-extended.
718 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
719 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
720 * as stored by stfl, bits 32-xxx contain additional facilities.
721 * How many facility words are stored depends on the number of
722 * doublewords passed to the instruction. The additional facilities
724 * Bit 42: decimal floating point facility is installed
725 * Bit 44: perform floating point operation facility is installed
727 * HWCAP_S390_DFP bit 6 (42 && 44).
729 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
730 elf_hwcap |= HWCAP_S390_DFP;
733 * Huge page support HWCAP_S390_HPAGE is bit 7.
735 if (MACHINE_HAS_HPAGE)
736 elf_hwcap |= HWCAP_S390_HPAGE;
739 * 64-bit register support for 31-bit processes
740 * HWCAP_S390_HIGH_GPRS is bit 9.
742 elf_hwcap |= HWCAP_S390_HIGH_GPRS;
745 * Transactional execution support HWCAP_S390_TE is bit 10.
747 if (test_facility(50) && test_facility(73))
748 elf_hwcap |= HWCAP_S390_TE;
751 * Vector extension HWCAP_S390_VXRS is bit 11. The Vector extension
752 * can be disabled with the "novx" parameter. Use MACHINE_HAS_VX
753 * instead of facility bit 129.
756 elf_hwcap |= HWCAP_S390_VXRS;
758 add_device_randomness(&cpu_id, sizeof(cpu_id));
759 switch (cpu_id.machine) {
762 default: /* Use "z900" as default for 64 bit kernels. */
763 strcpy(elf_platform, "z900");
767 strcpy(elf_platform, "z990");
771 strcpy(elf_platform, "z9-109");
775 strcpy(elf_platform, "z10");
779 strcpy(elf_platform, "z196");
783 strcpy(elf_platform, "zEC12");
786 strcpy(elf_platform, "z13");
791 * Virtualization support HWCAP_INT_SIE is bit 0.
794 int_hwcap |= HWCAP_INT_SIE;
798 arch_initcall(setup_hwcaps);
801 * Add system information as device randomness
803 static void __init setup_randomness(void)
805 struct sysinfo_3_2_2 *vmms;
807 vmms = (struct sysinfo_3_2_2 *) alloc_page(GFP_KERNEL);
808 if (vmms && stsi(vmms, 3, 2, 2) == 0 && vmms->count)
809 add_device_randomness(&vmms, vmms->count);
810 free_page((unsigned long) vmms);
814 * Setup function called from init/main.c just after the banner
818 void __init setup_arch(char **cmdline_p)
821 * print what head.S has found out about the machine
824 pr_info("Linux is running as a z/VM "
825 "guest operating system in 64-bit mode\n");
826 else if (MACHINE_IS_KVM)
827 pr_info("Linux is running under KVM in 64-bit mode\n");
828 else if (MACHINE_IS_LPAR)
829 pr_info("Linux is running natively in 64-bit mode\n");
831 /* Have one command line that is parsed and saved in /proc/cmdline */
832 /* boot_command_line has been already set up in early.c */
833 *cmdline_p = boot_command_line;
835 ROOT_DEV = Root_RAM0;
837 /* Is init_mm really needed? */
838 init_mm.start_code = PAGE_OFFSET;
839 init_mm.end_code = (unsigned long) &_etext;
840 init_mm.end_data = (unsigned long) &_edata;
841 init_mm.brk = (unsigned long) &_end;
844 #ifdef CONFIG_CRASH_DUMP
845 /* Deactivate elfcorehdr= kernel parameter */
846 elfcorehdr_addr = ELFCORE_ADDR_MAX;
852 /* Do some memory reservations *before* memory is added to memblock */
853 reserve_memory_end();
857 memblock_allow_resize();
859 /* Get information about *all* installed memory */
860 detect_memory_memblock();
865 * Make sure all chunks are MAX_ORDER aligned so we don't need the
866 * extra checks that HOLES_IN_ZONE would require.
868 * Is this still required?
870 memblock_trim_memory(1UL << (MAX_ORDER - 1 + PAGE_SHIFT));
876 reserve_crashkernel();
877 #ifdef CONFIG_CRASH_DUMP
879 * Be aware that smp_save_dump_cpus() triggers a system reset.
880 * Therefore CPU and device initialization should be done afterwards.
882 smp_save_dump_cpus();
888 smp_fill_possible_mask();
893 * Create kernel page tables and switch to virtual addressing.
897 /* Setup default console */
899 set_preferred_console();
901 /* Setup zfcpdump support */
904 /* Add system specific data to the random pool */