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/sched/task.h>
22 #include <linux/kernel.h>
23 #include <linux/memblock.h>
25 #include <linux/stddef.h>
26 #include <linux/unistd.h>
27 #include <linux/ptrace.h>
28 #include <linux/random.h>
29 #include <linux/user.h>
30 #include <linux/tty.h>
31 #include <linux/ioport.h>
32 #include <linux/delay.h>
33 #include <linux/init.h>
34 #include <linux/initrd.h>
35 #include <linux/bootmem.h>
36 #include <linux/root_dev.h>
37 #include <linux/console.h>
38 #include <linux/kernel_stat.h>
39 #include <linux/dma-contiguous.h>
40 #include <linux/device.h>
41 #include <linux/notifier.h>
42 #include <linux/pfn.h>
43 #include <linux/ctype.h>
44 #include <linux/reboot.h>
45 #include <linux/topology.h>
46 #include <linux/kexec.h>
47 #include <linux/crash_dump.h>
48 #include <linux/memory.h>
49 #include <linux/compat.h>
52 #include <asm/facility.h>
54 #include <asm/mmu_context.h>
55 #include <asm/cpcmd.h>
56 #include <asm/lowcore.h>
59 #include <asm/ptrace.h>
60 #include <asm/sections.h>
61 #include <asm/ebcdic.h>
62 #include <asm/kvm_virtio.h>
64 #include <asm/os_info.h>
66 #include <asm/sysinfo.h>
73 unsigned int console_mode = 0;
74 EXPORT_SYMBOL(console_mode);
76 unsigned int console_devno = -1;
77 EXPORT_SYMBOL(console_devno);
79 unsigned int console_irq = -1;
80 EXPORT_SYMBOL(console_irq);
82 unsigned long elf_hwcap __read_mostly = 0;
83 char elf_platform[ELF_PLATFORM_SIZE];
85 unsigned long int_hwcap = 0;
87 int __initdata memory_end_set;
88 unsigned long __initdata memory_end;
89 unsigned long __initdata max_physmem_end;
91 unsigned long VMALLOC_START;
92 EXPORT_SYMBOL(VMALLOC_START);
94 unsigned long VMALLOC_END;
95 EXPORT_SYMBOL(VMALLOC_END);
98 EXPORT_SYMBOL(vmemmap);
100 unsigned long MODULES_VADDR;
101 unsigned long MODULES_END;
103 /* An array with a pointer to the lowcore of every CPU. */
104 struct lowcore *lowcore_ptr[NR_CPUS];
105 EXPORT_SYMBOL(lowcore_ptr);
108 * This is set up by the setup-routine at boot-time
109 * for S390 need to find out, what we have to setup
110 * using address 0x10400 ...
113 #include <asm/setup.h>
116 * condev= and conmode= setup parameter.
119 static int __init condev_setup(char *str)
123 vdev = simple_strtoul(str, &str, 0);
124 if (vdev >= 0 && vdev < 65536) {
125 console_devno = vdev;
131 __setup("condev=", condev_setup);
133 static void __init set_preferred_console(void)
135 if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
136 add_preferred_console("ttyS", 0, NULL);
137 else if (CONSOLE_IS_3270)
138 add_preferred_console("tty3270", 0, NULL);
139 else if (CONSOLE_IS_VT220)
140 add_preferred_console("ttyS", 1, NULL);
141 else if (CONSOLE_IS_HVC)
142 add_preferred_console("hvc", 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)
208 } else if (MACHINE_IS_KVM) {
209 if (sclp.has_vt220 && IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE))
211 else if (sclp.has_linemode && IS_ENABLED(CONFIG_SCLP_CONSOLE))
216 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
222 #ifdef CONFIG_CRASH_DUMP
223 static void __init setup_zfcpdump(void)
225 if (ipl_info.type != IPL_TYPE_FCP_DUMP)
229 strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev");
230 console_loglevel = 2;
233 static inline void setup_zfcpdump(void) {}
234 #endif /* CONFIG_CRASH_DUMP */
237 * Reboot, halt and power_off stubs. They just call _machine_restart,
238 * _machine_halt or _machine_power_off.
241 void machine_restart(char *command)
243 if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
245 * Only unblank the console if we are called in enabled
246 * context or a bust_spinlocks cleared the way for us.
249 _machine_restart(command);
252 void machine_halt(void)
254 if (!in_interrupt() || oops_in_progress)
256 * Only unblank the console if we are called in enabled
257 * context or a bust_spinlocks cleared the way for us.
263 void machine_power_off(void)
265 if (!in_interrupt() || oops_in_progress)
267 * Only unblank the console if we are called in enabled
268 * context or a bust_spinlocks cleared the way for us.
271 _machine_power_off();
275 * Dummy power off function.
277 void (*pm_power_off)(void) = machine_power_off;
278 EXPORT_SYMBOL_GPL(pm_power_off);
280 static int __init early_parse_mem(char *p)
282 memory_end = memparse(p, &p);
283 memory_end &= PAGE_MASK;
287 early_param("mem", early_parse_mem);
289 static int __init parse_vmalloc(char *arg)
293 VMALLOC_END = (memparse(arg, &arg) + PAGE_SIZE - 1) & PAGE_MASK;
296 early_param("vmalloc", parse_vmalloc);
298 void *restart_stack __section(.data);
300 static void __init setup_lowcore(void)
305 * Setup lowcore for boot cpu
307 BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * 4096);
308 lc = memblock_virt_alloc_low(sizeof(*lc), sizeof(*lc));
309 lc->restart_psw.mask = PSW_KERNEL_BITS;
310 lc->restart_psw.addr = (unsigned long) restart_int_handler;
311 lc->external_new_psw.mask = PSW_KERNEL_BITS |
312 PSW_MASK_DAT | PSW_MASK_MCHECK;
313 lc->external_new_psw.addr = (unsigned long) ext_int_handler;
314 lc->svc_new_psw.mask = PSW_KERNEL_BITS |
315 PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
316 lc->svc_new_psw.addr = (unsigned long) system_call;
317 lc->program_new_psw.mask = PSW_KERNEL_BITS |
318 PSW_MASK_DAT | PSW_MASK_MCHECK;
319 lc->program_new_psw.addr = (unsigned long) pgm_check_handler;
320 lc->mcck_new_psw.mask = PSW_KERNEL_BITS;
321 lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler;
322 lc->io_new_psw.mask = PSW_KERNEL_BITS |
323 PSW_MASK_DAT | PSW_MASK_MCHECK;
324 lc->io_new_psw.addr = (unsigned long) io_int_handler;
325 lc->clock_comparator = -1ULL;
326 lc->kernel_stack = ((unsigned long) &init_thread_union)
327 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
328 lc->async_stack = (unsigned long)
329 memblock_virt_alloc(ASYNC_SIZE, ASYNC_SIZE)
330 + ASYNC_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
331 lc->panic_stack = (unsigned long)
332 memblock_virt_alloc(PAGE_SIZE, PAGE_SIZE)
333 + PAGE_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
334 lc->current_task = (unsigned long)&init_task;
336 lc->machine_flags = S390_lowcore.machine_flags;
337 lc->preempt_count = S390_lowcore.preempt_count;
338 lc->stfl_fac_list = S390_lowcore.stfl_fac_list;
339 memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
342 lc->vector_save_area_addr =
343 (unsigned long) &lc->vector_save_area;
344 lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0];
345 lc->sync_enter_timer = S390_lowcore.sync_enter_timer;
346 lc->async_enter_timer = S390_lowcore.async_enter_timer;
347 lc->exit_timer = S390_lowcore.exit_timer;
348 lc->user_timer = S390_lowcore.user_timer;
349 lc->system_timer = S390_lowcore.system_timer;
350 lc->steal_timer = S390_lowcore.steal_timer;
351 lc->last_update_timer = S390_lowcore.last_update_timer;
352 lc->last_update_clock = S390_lowcore.last_update_clock;
354 restart_stack = memblock_virt_alloc(ASYNC_SIZE, ASYNC_SIZE);
355 restart_stack += ASYNC_SIZE;
358 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant
359 * restart data to the absolute zero lowcore. This is necessary if
360 * PSW restart is done on an offline CPU that has lowcore zero.
362 lc->restart_stack = (unsigned long) restart_stack;
363 lc->restart_fn = (unsigned long) do_restart;
364 lc->restart_data = 0;
365 lc->restart_source = -1UL;
367 /* Setup absolute zero lowcore */
368 mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack);
369 mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn);
370 mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data);
371 mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source);
372 mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw);
375 lc->spinlock_lockval = arch_spin_lockval(0);
378 set_prefix((u32)(unsigned long) lc);
382 static struct resource code_resource = {
383 .name = "Kernel code",
384 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
387 static struct resource data_resource = {
388 .name = "Kernel data",
389 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
392 static struct resource bss_resource = {
393 .name = "Kernel bss",
394 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
397 static struct resource __initdata *standard_resources[] = {
403 static void __init setup_resources(void)
405 struct resource *res, *std_res, *sub_res;
406 struct memblock_region *reg;
409 code_resource.start = (unsigned long) &_text;
410 code_resource.end = (unsigned long) &_etext - 1;
411 data_resource.start = (unsigned long) &_etext;
412 data_resource.end = (unsigned long) &_edata - 1;
413 bss_resource.start = (unsigned long) &__bss_start;
414 bss_resource.end = (unsigned long) &__bss_stop - 1;
416 for_each_memblock(memory, reg) {
417 res = memblock_virt_alloc(sizeof(*res), 8);
418 res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM;
420 res->name = "System RAM";
421 res->start = reg->base;
422 res->end = reg->base + reg->size - 1;
423 request_resource(&iomem_resource, res);
425 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
426 std_res = standard_resources[j];
427 if (std_res->start < res->start ||
428 std_res->start > res->end)
430 if (std_res->end > res->end) {
431 sub_res = memblock_virt_alloc(sizeof(*sub_res), 8);
433 sub_res->end = res->end;
434 std_res->start = res->end + 1;
435 request_resource(res, sub_res);
437 request_resource(res, std_res);
441 #ifdef CONFIG_CRASH_DUMP
443 * Re-add removed crash kernel memory as reserved memory. This makes
444 * sure it will be mapped with the identity mapping and struct pages
445 * will be created, so it can be resized later on.
446 * However add it later since the crash kernel resource should not be
447 * part of the System RAM resource.
449 if (crashk_res.end) {
450 memblock_add_node(crashk_res.start, resource_size(&crashk_res), 0);
451 memblock_reserve(crashk_res.start, resource_size(&crashk_res));
452 insert_resource(&iomem_resource, &crashk_res);
457 static void __init setup_memory_end(void)
459 unsigned long vmax, vmalloc_size, tmp;
461 /* Choose kernel address space layout: 2, 3, or 4 levels. */
462 vmalloc_size = VMALLOC_END ?: (128UL << 30) - MODULES_LEN;
463 tmp = (memory_end ?: max_physmem_end) / PAGE_SIZE;
464 tmp = tmp * (sizeof(struct page) + PAGE_SIZE);
465 if (tmp + vmalloc_size + MODULES_LEN <= (1UL << 42))
466 vmax = 1UL << 42; /* 3-level kernel page table */
468 vmax = 1UL << 53; /* 4-level kernel page table */
469 /* module area is at the end of the kernel address space. */
471 MODULES_VADDR = MODULES_END - MODULES_LEN;
472 VMALLOC_END = MODULES_VADDR;
473 VMALLOC_START = vmax - vmalloc_size;
475 /* Split remaining virtual space between 1:1 mapping & vmemmap array */
476 tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page));
477 /* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */
478 tmp = SECTION_ALIGN_UP(tmp);
479 tmp = VMALLOC_START - tmp * sizeof(struct page);
480 tmp &= ~((vmax >> 11) - 1); /* align to page table level */
481 tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS);
482 vmemmap = (struct page *) tmp;
484 /* Take care that memory_end is set and <= vmemmap */
485 memory_end = min(memory_end ?: max_physmem_end, tmp);
486 max_pfn = max_low_pfn = PFN_DOWN(memory_end);
487 memblock_remove(memory_end, ULONG_MAX);
489 pr_notice("The maximum memory size is %luMB\n", memory_end >> 20);
492 static void __init setup_vmcoreinfo(void)
494 mem_assign_absolute(S390_lowcore.vmcore_info, paddr_vmcoreinfo_note());
497 #ifdef CONFIG_CRASH_DUMP
500 * When kdump is enabled, we have to ensure that no memory from
501 * the area [0 - crashkernel memory size] and
502 * [crashk_res.start - crashk_res.end] is set offline.
504 static int kdump_mem_notifier(struct notifier_block *nb,
505 unsigned long action, void *data)
507 struct memory_notify *arg = data;
509 if (action != MEM_GOING_OFFLINE)
511 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
513 if (arg->start_pfn > PFN_DOWN(crashk_res.end))
515 if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start))
520 static struct notifier_block kdump_mem_nb = {
521 .notifier_call = kdump_mem_notifier,
527 * Make sure that the area behind memory_end is protected
529 static void reserve_memory_end(void)
531 #ifdef CONFIG_CRASH_DUMP
532 if (ipl_info.type == IPL_TYPE_FCP_DUMP &&
533 !OLDMEM_BASE && sclp.hsa_size) {
534 memory_end = sclp.hsa_size;
535 memory_end &= PAGE_MASK;
541 memblock_reserve(memory_end, ULONG_MAX);
545 * Make sure that oldmem, where the dump is stored, is protected
547 static void reserve_oldmem(void)
549 #ifdef CONFIG_CRASH_DUMP
551 /* Forget all memory above the running kdump system */
552 memblock_reserve(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX);
557 * Make sure that oldmem, where the dump is stored, is protected
559 static void remove_oldmem(void)
561 #ifdef CONFIG_CRASH_DUMP
563 /* Forget all memory above the running kdump system */
564 memblock_remove(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX);
569 * Reserve memory for kdump kernel to be loaded with kexec
571 static void __init reserve_crashkernel(void)
573 #ifdef CONFIG_CRASH_DUMP
574 unsigned long long crash_base, crash_size;
575 phys_addr_t low, high;
578 rc = parse_crashkernel(boot_command_line, memory_end, &crash_size,
581 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
582 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
583 if (rc || crash_size == 0)
586 if (memblock.memory.regions[0].size < crash_size) {
587 pr_info("crashkernel reservation failed: %s\n",
588 "first memory chunk must be at least crashkernel size");
592 low = crash_base ?: OLDMEM_BASE;
593 high = low + crash_size;
594 if (low >= OLDMEM_BASE && high <= OLDMEM_BASE + OLDMEM_SIZE) {
595 /* The crashkernel fits into OLDMEM, reuse OLDMEM */
598 /* Find suitable area in free memory */
599 low = max_t(unsigned long, crash_size, sclp.hsa_size);
600 high = crash_base ? crash_base + crash_size : ULONG_MAX;
602 if (crash_base && crash_base < low) {
603 pr_info("crashkernel reservation failed: %s\n",
604 "crash_base too low");
607 low = crash_base ?: low;
608 crash_base = memblock_find_in_range(low, high, crash_size,
609 KEXEC_CRASH_MEM_ALIGN);
613 pr_info("crashkernel reservation failed: %s\n",
614 "no suitable area found");
618 if (register_memory_notifier(&kdump_mem_nb))
621 if (!OLDMEM_BASE && MACHINE_IS_VM)
622 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
623 crashk_res.start = crash_base;
624 crashk_res.end = crash_base + crash_size - 1;
625 memblock_remove(crash_base, crash_size);
626 pr_info("Reserving %lluMB of memory at %lluMB "
627 "for crashkernel (System RAM: %luMB)\n",
628 crash_size >> 20, crash_base >> 20,
629 (unsigned long)memblock.memory.total_size >> 20);
630 os_info_crashkernel_add(crash_base, crash_size);
635 * Reserve the initrd from being used by memblock
637 static void __init reserve_initrd(void)
639 #ifdef CONFIG_BLK_DEV_INITRD
640 if (!INITRD_START || !INITRD_SIZE)
642 initrd_start = INITRD_START;
643 initrd_end = initrd_start + INITRD_SIZE;
644 memblock_reserve(INITRD_START, INITRD_SIZE);
649 * Check for initrd being in usable memory
651 static void __init check_initrd(void)
653 #ifdef CONFIG_BLK_DEV_INITRD
654 if (INITRD_START && INITRD_SIZE &&
655 !memblock_is_region_memory(INITRD_START, INITRD_SIZE)) {
656 pr_err("The initial RAM disk does not fit into the memory\n");
657 memblock_free(INITRD_START, INITRD_SIZE);
658 initrd_start = initrd_end = 0;
664 * Reserve memory used for lowcore/command line/kernel image.
666 static void __init reserve_kernel(void)
668 unsigned long start_pfn = PFN_UP(__pa(&_end));
670 #ifdef CONFIG_DMA_API_DEBUG
672 * DMA_API_DEBUG code stumbles over addresses from the
673 * range [_ehead, _stext]. Mark the memory as reserved
674 * so it is not used for CONFIG_DMA_API_DEBUG=y.
676 memblock_reserve(0, PFN_PHYS(start_pfn));
678 memblock_reserve(0, (unsigned long)_ehead);
679 memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn)
680 - (unsigned long)_stext);
684 static void __init setup_memory(void)
686 struct memblock_region *reg;
689 * Init storage key for present memory
691 for_each_memblock(memory, reg) {
692 storage_key_init_range(reg->base, reg->base + reg->size);
694 psw_set_key(PAGE_DEFAULT_KEY);
697 memblock_enforce_memory_limit(memblock_end_of_DRAM());
701 * Setup hardware capabilities.
703 static int __init setup_hwcaps(void)
705 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
710 * The store facility list bits numbers as found in the principles
711 * of operation are numbered with bit 1UL<<31 as number 0 to
712 * bit 1UL<<0 as number 31.
713 * Bit 0: instructions named N3, "backported" to esa-mode
714 * Bit 2: z/Architecture mode is active
715 * Bit 7: the store-facility-list-extended facility is installed
716 * Bit 17: the message-security assist is installed
717 * Bit 19: the long-displacement facility is installed
718 * Bit 21: the extended-immediate facility is installed
719 * Bit 22: extended-translation facility 3 is installed
720 * Bit 30: extended-translation facility 3 enhancement facility
721 * These get translated to:
722 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
723 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
724 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
725 * HWCAP_S390_ETF3EH bit 8 (22 && 30).
727 for (i = 0; i < 6; i++)
728 if (test_facility(stfl_bits[i]))
729 elf_hwcap |= 1UL << i;
731 if (test_facility(22) && test_facility(30))
732 elf_hwcap |= HWCAP_S390_ETF3EH;
735 * Check for additional facilities with store-facility-list-extended.
736 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
737 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
738 * as stored by stfl, bits 32-xxx contain additional facilities.
739 * How many facility words are stored depends on the number of
740 * doublewords passed to the instruction. The additional facilities
742 * Bit 42: decimal floating point facility is installed
743 * Bit 44: perform floating point operation facility is installed
745 * HWCAP_S390_DFP bit 6 (42 && 44).
747 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
748 elf_hwcap |= HWCAP_S390_DFP;
751 * Huge page support HWCAP_S390_HPAGE is bit 7.
753 if (MACHINE_HAS_EDAT1)
754 elf_hwcap |= HWCAP_S390_HPAGE;
757 * 64-bit register support for 31-bit processes
758 * HWCAP_S390_HIGH_GPRS is bit 9.
760 elf_hwcap |= HWCAP_S390_HIGH_GPRS;
763 * Transactional execution support HWCAP_S390_TE is bit 10.
765 if (test_facility(50) && test_facility(73))
766 elf_hwcap |= HWCAP_S390_TE;
769 * Vector extension HWCAP_S390_VXRS is bit 11. The Vector extension
770 * can be disabled with the "novx" parameter. Use MACHINE_HAS_VX
771 * instead of facility bit 129.
773 if (MACHINE_HAS_VX) {
774 elf_hwcap |= HWCAP_S390_VXRS;
775 if (test_facility(134))
776 elf_hwcap |= HWCAP_S390_VXRS_EXT;
777 if (test_facility(135))
778 elf_hwcap |= HWCAP_S390_VXRS_BCD;
782 add_device_randomness(&cpu_id, sizeof(cpu_id));
783 switch (cpu_id.machine) {
786 default: /* Use "z900" as default for 64 bit kernels. */
787 strcpy(elf_platform, "z900");
791 strcpy(elf_platform, "z990");
795 strcpy(elf_platform, "z9-109");
799 strcpy(elf_platform, "z10");
803 strcpy(elf_platform, "z196");
807 strcpy(elf_platform, "zEC12");
811 strcpy(elf_platform, "z13");
816 * Virtualization support HWCAP_INT_SIE is bit 0.
819 int_hwcap |= HWCAP_INT_SIE;
823 arch_initcall(setup_hwcaps);
826 * Add system information as device randomness
828 static void __init setup_randomness(void)
830 struct sysinfo_3_2_2 *vmms;
832 vmms = (struct sysinfo_3_2_2 *) memblock_alloc(PAGE_SIZE, PAGE_SIZE);
833 if (stsi(vmms, 3, 2, 2) == 0 && vmms->count)
834 add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count);
835 memblock_free((unsigned long) vmms, PAGE_SIZE);
839 * Find the correct size for the task_struct. This depends on
840 * the size of the struct fpu at the end of the thread_struct
841 * which is embedded in the task_struct.
843 static void __init setup_task_size(void)
845 int task_size = sizeof(struct task_struct);
847 if (!MACHINE_HAS_VX) {
848 task_size -= sizeof(__vector128) * __NUM_VXRS;
849 task_size += sizeof(freg_t) * __NUM_FPRS;
851 arch_task_struct_size = task_size;
855 * Setup function called from init/main.c just after the banner
859 void __init setup_arch(char **cmdline_p)
862 * print what head.S has found out about the machine
865 pr_info("Linux is running as a z/VM "
866 "guest operating system in 64-bit mode\n");
867 else if (MACHINE_IS_KVM)
868 pr_info("Linux is running under KVM in 64-bit mode\n");
869 else if (MACHINE_IS_LPAR)
870 pr_info("Linux is running natively in 64-bit mode\n");
872 /* Have one command line that is parsed and saved in /proc/cmdline */
873 /* boot_command_line has been already set up in early.c */
874 *cmdline_p = boot_command_line;
876 ROOT_DEV = Root_RAM0;
878 /* Is init_mm really needed? */
879 init_mm.start_code = PAGE_OFFSET;
880 init_mm.end_code = (unsigned long) &_etext;
881 init_mm.end_data = (unsigned long) &_edata;
882 init_mm.brk = (unsigned long) &_end;
885 #ifdef CONFIG_CRASH_DUMP
886 /* Deactivate elfcorehdr= kernel parameter */
887 elfcorehdr_addr = ELFCORE_ADDR_MAX;
894 /* Do some memory reservations *before* memory is added to memblock */
895 reserve_memory_end();
899 memblock_allow_resize();
901 /* Get information about *all* installed memory */
902 detect_memory_memblock();
907 * Make sure all chunks are MAX_ORDER aligned so we don't need the
908 * extra checks that HOLES_IN_ZONE would require.
910 * Is this still required?
912 memblock_trim_memory(1UL << (MAX_ORDER - 1 + PAGE_SHIFT));
916 dma_contiguous_reserve(memory_end);
919 reserve_crashkernel();
920 #ifdef CONFIG_CRASH_DUMP
922 * Be aware that smp_save_dump_cpus() triggers a system reset.
923 * Therefore CPU and device initialization should be done afterwards.
925 smp_save_dump_cpus();
931 smp_fill_possible_mask();
932 cpu_detect_mhz_feature();
936 topology_init_early();
939 * Create kernel page tables and switch to virtual addressing.
943 /* Setup default console */
945 set_preferred_console();
947 /* Setup zfcpdump support */
950 /* Add system specific data to the random pool */