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/cpu.h>
23 #include <linux/kernel.h>
24 #include <linux/memblock.h>
26 #include <linux/stddef.h>
27 #include <linux/unistd.h>
28 #include <linux/ptrace.h>
29 #include <linux/random.h>
30 #include <linux/user.h>
31 #include <linux/tty.h>
32 #include <linux/ioport.h>
33 #include <linux/delay.h>
34 #include <linux/init.h>
35 #include <linux/initrd.h>
36 #include <linux/bootmem.h>
37 #include <linux/root_dev.h>
38 #include <linux/console.h>
39 #include <linux/kernel_stat.h>
40 #include <linux/dma-contiguous.h>
41 #include <linux/device.h>
42 #include <linux/notifier.h>
43 #include <linux/pfn.h>
44 #include <linux/ctype.h>
45 #include <linux/reboot.h>
46 #include <linux/topology.h>
47 #include <linux/kexec.h>
48 #include <linux/crash_dump.h>
49 #include <linux/memory.h>
50 #include <linux/compat.h>
53 #include <asm/facility.h>
55 #include <asm/mmu_context.h>
56 #include <asm/cpcmd.h>
57 #include <asm/lowcore.h>
61 #include <asm/ptrace.h>
62 #include <asm/sections.h>
63 #include <asm/ebcdic.h>
65 #include <asm/os_info.h>
67 #include <asm/sysinfo.h>
69 #include <asm/alternative.h>
75 unsigned int console_mode = 0;
76 EXPORT_SYMBOL(console_mode);
78 unsigned int console_devno = -1;
79 EXPORT_SYMBOL(console_devno);
81 unsigned int console_irq = -1;
82 EXPORT_SYMBOL(console_irq);
84 unsigned long elf_hwcap __read_mostly = 0;
85 char elf_platform[ELF_PLATFORM_SIZE];
87 unsigned long int_hwcap = 0;
89 int __initdata memory_end_set;
90 unsigned long __initdata memory_end;
91 unsigned long __initdata max_physmem_end;
93 unsigned long VMALLOC_START;
94 EXPORT_SYMBOL(VMALLOC_START);
96 unsigned long VMALLOC_END;
97 EXPORT_SYMBOL(VMALLOC_END);
100 EXPORT_SYMBOL(vmemmap);
102 unsigned long MODULES_VADDR;
103 unsigned long MODULES_END;
105 /* An array with a pointer to the lowcore of every CPU. */
106 struct lowcore *lowcore_ptr[NR_CPUS];
107 EXPORT_SYMBOL(lowcore_ptr);
110 * This is set up by the setup-routine at boot-time
111 * for S390 need to find out, what we have to setup
112 * using address 0x10400 ...
115 #include <asm/setup.h>
118 * condev= and conmode= setup parameter.
121 static int __init condev_setup(char *str)
125 vdev = simple_strtoul(str, &str, 0);
126 if (vdev >= 0 && vdev < 65536) {
127 console_devno = vdev;
133 __setup("condev=", condev_setup);
135 static void __init set_preferred_console(void)
137 if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
138 add_preferred_console("ttyS", 0, NULL);
139 else if (CONSOLE_IS_3270)
140 add_preferred_console("tty3270", 0, NULL);
141 else if (CONSOLE_IS_VT220)
142 add_preferred_console("ttyS", 1, NULL);
143 else if (CONSOLE_IS_HVC)
144 add_preferred_console("hvc", 0, NULL);
147 static int __init conmode_setup(char *str)
149 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
150 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
153 #if defined(CONFIG_TN3215_CONSOLE)
154 if (strncmp(str, "3215", 5) == 0)
157 #if defined(CONFIG_TN3270_CONSOLE)
158 if (strncmp(str, "3270", 5) == 0)
161 set_preferred_console();
165 __setup("conmode=", conmode_setup);
167 static void __init conmode_default(void)
169 char query_buffer[1024];
173 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
174 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
175 ptr = strstr(query_buffer, "SUBCHANNEL =");
176 console_irq = simple_strtoul(ptr + 13, NULL, 16);
177 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
178 ptr = strstr(query_buffer, "CONMODE");
180 * Set the conmode to 3215 so that the device recognition
181 * will set the cu_type of the console to 3215. If the
182 * conmode is 3270 and we don't set it back then both
183 * 3215 and the 3270 driver will try to access the console
184 * device (3215 as console and 3270 as normal tty).
186 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
188 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
193 if (strncmp(ptr + 8, "3270", 4) == 0) {
194 #if defined(CONFIG_TN3270_CONSOLE)
196 #elif defined(CONFIG_TN3215_CONSOLE)
198 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
201 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
202 #if defined(CONFIG_TN3215_CONSOLE)
204 #elif defined(CONFIG_TN3270_CONSOLE)
206 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
210 } else if (MACHINE_IS_KVM) {
211 if (sclp.has_vt220 && IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE))
213 else if (sclp.has_linemode && IS_ENABLED(CONFIG_SCLP_CONSOLE))
218 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
224 #ifdef CONFIG_CRASH_DUMP
225 static void __init setup_zfcpdump(void)
227 if (ipl_info.type != IPL_TYPE_FCP_DUMP)
231 strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev");
232 console_loglevel = 2;
235 static inline void setup_zfcpdump(void) {}
236 #endif /* CONFIG_CRASH_DUMP */
239 * Reboot, halt and power_off stubs. They just call _machine_restart,
240 * _machine_halt or _machine_power_off.
243 void machine_restart(char *command)
245 if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
247 * Only unblank the console if we are called in enabled
248 * context or a bust_spinlocks cleared the way for us.
251 _machine_restart(command);
254 void machine_halt(void)
256 if (!in_interrupt() || oops_in_progress)
258 * Only unblank the console if we are called in enabled
259 * context or a bust_spinlocks cleared the way for us.
265 void machine_power_off(void)
267 if (!in_interrupt() || oops_in_progress)
269 * Only unblank the console if we are called in enabled
270 * context or a bust_spinlocks cleared the way for us.
273 _machine_power_off();
277 * Dummy power off function.
279 void (*pm_power_off)(void) = machine_power_off;
280 EXPORT_SYMBOL_GPL(pm_power_off);
282 static int __init early_parse_mem(char *p)
284 memory_end = memparse(p, &p);
285 memory_end &= PAGE_MASK;
289 early_param("mem", early_parse_mem);
291 static int __init parse_vmalloc(char *arg)
295 VMALLOC_END = (memparse(arg, &arg) + PAGE_SIZE - 1) & PAGE_MASK;
298 early_param("vmalloc", parse_vmalloc);
300 void *restart_stack __section(.data);
302 static void __init setup_lowcore(void)
307 * Setup lowcore for boot cpu
309 BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * PAGE_SIZE);
310 lc = memblock_virt_alloc_low(sizeof(*lc), sizeof(*lc));
311 lc->restart_psw.mask = PSW_KERNEL_BITS;
312 lc->restart_psw.addr = (unsigned long) restart_int_handler;
313 lc->external_new_psw.mask = PSW_KERNEL_BITS |
314 PSW_MASK_DAT | PSW_MASK_MCHECK;
315 lc->external_new_psw.addr = (unsigned long) ext_int_handler;
316 lc->svc_new_psw.mask = PSW_KERNEL_BITS |
317 PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
318 lc->svc_new_psw.addr = (unsigned long) system_call;
319 lc->program_new_psw.mask = PSW_KERNEL_BITS |
320 PSW_MASK_DAT | PSW_MASK_MCHECK;
321 lc->program_new_psw.addr = (unsigned long) pgm_check_handler;
322 lc->mcck_new_psw.mask = PSW_KERNEL_BITS;
323 lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler;
324 lc->io_new_psw.mask = PSW_KERNEL_BITS |
325 PSW_MASK_DAT | PSW_MASK_MCHECK;
326 lc->io_new_psw.addr = (unsigned long) io_int_handler;
327 lc->clock_comparator = clock_comparator_max;
328 lc->kernel_stack = ((unsigned long) &init_thread_union)
329 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
330 lc->async_stack = (unsigned long)
331 memblock_virt_alloc(ASYNC_SIZE, ASYNC_SIZE)
332 + ASYNC_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
333 lc->panic_stack = (unsigned long)
334 memblock_virt_alloc(PAGE_SIZE, PAGE_SIZE)
335 + PAGE_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
336 lc->current_task = (unsigned long)&init_task;
338 lc->machine_flags = S390_lowcore.machine_flags;
339 lc->preempt_count = S390_lowcore.preempt_count;
340 lc->stfl_fac_list = S390_lowcore.stfl_fac_list;
341 memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
343 nmi_alloc_boot_cpu(lc);
344 vdso_alloc_boot_cpu(lc);
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);
376 lc->spinlock_index = 0;
377 arch_spin_lock_setup(0);
380 set_prefix((u32)(unsigned long) lc);
384 static struct resource code_resource = {
385 .name = "Kernel code",
386 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
389 static struct resource data_resource = {
390 .name = "Kernel data",
391 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
394 static struct resource bss_resource = {
395 .name = "Kernel bss",
396 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
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 = memblock_virt_alloc(sizeof(*res), 8);
420 res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM;
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 = memblock_virt_alloc(sizeof(*sub_res), 8);
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);
443 #ifdef CONFIG_CRASH_DUMP
445 * Re-add removed crash kernel memory as reserved memory. This makes
446 * sure it will be mapped with the identity mapping and struct pages
447 * will be created, so it can be resized later on.
448 * However add it later since the crash kernel resource should not be
449 * part of the System RAM resource.
451 if (crashk_res.end) {
452 memblock_add_node(crashk_res.start, resource_size(&crashk_res), 0);
453 memblock_reserve(crashk_res.start, resource_size(&crashk_res));
454 insert_resource(&iomem_resource, &crashk_res);
459 static void __init setup_memory_end(void)
461 unsigned long vmax, vmalloc_size, tmp;
463 /* Choose kernel address space layout: 2, 3, or 4 levels. */
464 vmalloc_size = VMALLOC_END ?: (128UL << 30) - MODULES_LEN;
465 tmp = (memory_end ?: max_physmem_end) / PAGE_SIZE;
466 tmp = tmp * (sizeof(struct page) + PAGE_SIZE);
467 if (tmp + vmalloc_size + MODULES_LEN <= _REGION2_SIZE)
468 vmax = _REGION2_SIZE; /* 3-level kernel page table */
470 vmax = _REGION1_SIZE; /* 4-level kernel page table */
471 /* module area is at the end of the kernel address space. */
473 MODULES_VADDR = MODULES_END - MODULES_LEN;
474 VMALLOC_END = MODULES_VADDR;
475 VMALLOC_START = vmax - vmalloc_size;
477 /* Split remaining virtual space between 1:1 mapping & vmemmap array */
478 tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page));
479 /* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */
480 tmp = SECTION_ALIGN_UP(tmp);
481 tmp = VMALLOC_START - tmp * sizeof(struct page);
482 tmp &= ~((vmax >> 11) - 1); /* align to page table level */
483 tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS);
484 vmemmap = (struct page *) tmp;
486 /* Take care that memory_end is set and <= vmemmap */
487 memory_end = min(memory_end ?: max_physmem_end, tmp);
488 max_pfn = max_low_pfn = PFN_DOWN(memory_end);
489 memblock_remove(memory_end, ULONG_MAX);
491 pr_notice("The maximum memory size is %luMB\n", memory_end >> 20);
494 #ifdef CONFIG_CRASH_DUMP
497 * When kdump is enabled, we have to ensure that no memory from
498 * the area [0 - crashkernel memory size] and
499 * [crashk_res.start - crashk_res.end] is set offline.
501 static int kdump_mem_notifier(struct notifier_block *nb,
502 unsigned long action, void *data)
504 struct memory_notify *arg = data;
506 if (action != MEM_GOING_OFFLINE)
508 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
510 if (arg->start_pfn > PFN_DOWN(crashk_res.end))
512 if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start))
517 static struct notifier_block kdump_mem_nb = {
518 .notifier_call = kdump_mem_notifier,
524 * Make sure that the area behind memory_end is protected
526 static void reserve_memory_end(void)
528 #ifdef CONFIG_CRASH_DUMP
529 if (ipl_info.type == IPL_TYPE_FCP_DUMP &&
530 !OLDMEM_BASE && sclp.hsa_size) {
531 memory_end = sclp.hsa_size;
532 memory_end &= PAGE_MASK;
538 memblock_reserve(memory_end, ULONG_MAX);
542 * Make sure that oldmem, where the dump is stored, is protected
544 static void reserve_oldmem(void)
546 #ifdef CONFIG_CRASH_DUMP
548 /* Forget all memory above the running kdump system */
549 memblock_reserve(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX);
554 * Make sure that oldmem, where the dump is stored, is protected
556 static void remove_oldmem(void)
558 #ifdef CONFIG_CRASH_DUMP
560 /* Forget all memory above the running kdump system */
561 memblock_remove(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX);
566 * Reserve memory for kdump kernel to be loaded with kexec
568 static void __init reserve_crashkernel(void)
570 #ifdef CONFIG_CRASH_DUMP
571 unsigned long long crash_base, crash_size;
572 phys_addr_t low, high;
575 rc = parse_crashkernel(boot_command_line, memory_end, &crash_size,
578 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
579 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
580 if (rc || crash_size == 0)
583 if (memblock.memory.regions[0].size < crash_size) {
584 pr_info("crashkernel reservation failed: %s\n",
585 "first memory chunk must be at least crashkernel size");
589 low = crash_base ?: OLDMEM_BASE;
590 high = low + crash_size;
591 if (low >= OLDMEM_BASE && high <= OLDMEM_BASE + OLDMEM_SIZE) {
592 /* The crashkernel fits into OLDMEM, reuse OLDMEM */
595 /* Find suitable area in free memory */
596 low = max_t(unsigned long, crash_size, sclp.hsa_size);
597 high = crash_base ? crash_base + crash_size : ULONG_MAX;
599 if (crash_base && crash_base < low) {
600 pr_info("crashkernel reservation failed: %s\n",
601 "crash_base too low");
604 low = crash_base ?: low;
605 crash_base = memblock_find_in_range(low, high, crash_size,
606 KEXEC_CRASH_MEM_ALIGN);
610 pr_info("crashkernel reservation failed: %s\n",
611 "no suitable area found");
615 if (register_memory_notifier(&kdump_mem_nb))
618 if (!OLDMEM_BASE && MACHINE_IS_VM)
619 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
620 crashk_res.start = crash_base;
621 crashk_res.end = crash_base + crash_size - 1;
622 memblock_remove(crash_base, crash_size);
623 pr_info("Reserving %lluMB of memory at %lluMB "
624 "for crashkernel (System RAM: %luMB)\n",
625 crash_size >> 20, crash_base >> 20,
626 (unsigned long)memblock.memory.total_size >> 20);
627 os_info_crashkernel_add(crash_base, crash_size);
632 * Reserve the initrd from being used by memblock
634 static void __init reserve_initrd(void)
636 #ifdef CONFIG_BLK_DEV_INITRD
637 if (!INITRD_START || !INITRD_SIZE)
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("The initial RAM disk does not fit into the memory\n");
654 memblock_free(INITRD_START, INITRD_SIZE);
655 initrd_start = initrd_end = 0;
661 * Reserve memory used for lowcore/command line/kernel image.
663 static void __init reserve_kernel(void)
665 unsigned long start_pfn = PFN_UP(__pa(&_end));
667 #ifdef CONFIG_DMA_API_DEBUG
669 * DMA_API_DEBUG code stumbles over addresses from the
670 * range [_ehead, _stext]. Mark the memory as reserved
671 * so it is not used for CONFIG_DMA_API_DEBUG=y.
673 memblock_reserve(0, PFN_PHYS(start_pfn));
675 memblock_reserve(0, (unsigned long)_ehead);
676 memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn)
677 - (unsigned long)_stext);
681 static void __init setup_memory(void)
683 struct memblock_region *reg;
686 * Init storage key for present memory
688 for_each_memblock(memory, reg) {
689 storage_key_init_range(reg->base, reg->base + reg->size);
691 psw_set_key(PAGE_DEFAULT_KEY);
694 memblock_enforce_memory_limit(memblock_end_of_DRAM());
698 * Setup hardware capabilities.
700 static int __init setup_hwcaps(void)
702 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
707 * The store facility list bits numbers as found in the principles
708 * of operation are numbered with bit 1UL<<31 as number 0 to
709 * bit 1UL<<0 as number 31.
710 * Bit 0: instructions named N3, "backported" to esa-mode
711 * Bit 2: z/Architecture mode is active
712 * Bit 7: the store-facility-list-extended facility is installed
713 * Bit 17: the message-security assist is installed
714 * Bit 19: the long-displacement facility is installed
715 * Bit 21: the extended-immediate facility is installed
716 * Bit 22: extended-translation facility 3 is installed
717 * Bit 30: extended-translation facility 3 enhancement facility
718 * These get translated to:
719 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
720 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
721 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
722 * HWCAP_S390_ETF3EH bit 8 (22 && 30).
724 for (i = 0; i < 6; i++)
725 if (test_facility(stfl_bits[i]))
726 elf_hwcap |= 1UL << i;
728 if (test_facility(22) && test_facility(30))
729 elf_hwcap |= HWCAP_S390_ETF3EH;
732 * Check for additional facilities with store-facility-list-extended.
733 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
734 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
735 * as stored by stfl, bits 32-xxx contain additional facilities.
736 * How many facility words are stored depends on the number of
737 * doublewords passed to the instruction. The additional facilities
739 * Bit 42: decimal floating point facility is installed
740 * Bit 44: perform floating point operation facility is installed
742 * HWCAP_S390_DFP bit 6 (42 && 44).
744 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
745 elf_hwcap |= HWCAP_S390_DFP;
748 * Huge page support HWCAP_S390_HPAGE is bit 7.
750 if (MACHINE_HAS_EDAT1)
751 elf_hwcap |= HWCAP_S390_HPAGE;
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.
763 elf_hwcap |= HWCAP_S390_TE;
766 * Vector extension HWCAP_S390_VXRS is bit 11. The Vector extension
767 * can be disabled with the "novx" parameter. Use MACHINE_HAS_VX
768 * instead of facility bit 129.
770 if (MACHINE_HAS_VX) {
771 elf_hwcap |= HWCAP_S390_VXRS;
772 if (test_facility(134))
773 elf_hwcap |= HWCAP_S390_VXRS_EXT;
774 if (test_facility(135))
775 elf_hwcap |= HWCAP_S390_VXRS_BCD;
779 * Guarded storage support HWCAP_S390_GS is bit 12.
782 elf_hwcap |= HWCAP_S390_GS;
785 add_device_randomness(&cpu_id, sizeof(cpu_id));
786 switch (cpu_id.machine) {
789 default: /* Use "z900" as default for 64 bit kernels. */
790 strcpy(elf_platform, "z900");
794 strcpy(elf_platform, "z990");
798 strcpy(elf_platform, "z9-109");
802 strcpy(elf_platform, "z10");
806 strcpy(elf_platform, "z196");
810 strcpy(elf_platform, "zEC12");
814 strcpy(elf_platform, "z13");
817 strcpy(elf_platform, "z14");
822 * Virtualization support HWCAP_INT_SIE is bit 0.
825 int_hwcap |= HWCAP_INT_SIE;
829 arch_initcall(setup_hwcaps);
832 * Add system information as device randomness
834 static void __init setup_randomness(void)
836 struct sysinfo_3_2_2 *vmms;
838 vmms = (struct sysinfo_3_2_2 *) memblock_alloc(PAGE_SIZE, PAGE_SIZE);
839 if (stsi(vmms, 3, 2, 2) == 0 && vmms->count)
840 add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count);
841 memblock_free((unsigned long) vmms, PAGE_SIZE);
845 * Find the correct size for the task_struct. This depends on
846 * the size of the struct fpu at the end of the thread_struct
847 * which is embedded in the task_struct.
849 static void __init setup_task_size(void)
851 int task_size = sizeof(struct task_struct);
853 if (!MACHINE_HAS_VX) {
854 task_size -= sizeof(__vector128) * __NUM_VXRS;
855 task_size += sizeof(freg_t) * __NUM_FPRS;
857 arch_task_struct_size = task_size;
861 * Setup function called from init/main.c just after the banner
865 void __init setup_arch(char **cmdline_p)
868 * print what head.S has found out about the machine
871 pr_info("Linux is running as a z/VM "
872 "guest operating system in 64-bit mode\n");
873 else if (MACHINE_IS_KVM)
874 pr_info("Linux is running under KVM in 64-bit mode\n");
875 else if (MACHINE_IS_LPAR)
876 pr_info("Linux is running natively in 64-bit mode\n");
878 /* Have one command line that is parsed and saved in /proc/cmdline */
879 /* boot_command_line has been already set up in early.c */
880 *cmdline_p = boot_command_line;
882 ROOT_DEV = Root_RAM0;
884 /* Is init_mm really needed? */
885 init_mm.start_code = PAGE_OFFSET;
886 init_mm.end_code = (unsigned long) &_etext;
887 init_mm.end_data = (unsigned long) &_edata;
888 init_mm.brk = (unsigned long) &_end;
891 #ifdef CONFIG_CRASH_DUMP
892 /* Deactivate elfcorehdr= kernel parameter */
893 elfcorehdr_addr = ELFCORE_ADDR_MAX;
900 /* Do some memory reservations *before* memory is added to memblock */
901 reserve_memory_end();
905 memblock_allow_resize();
907 /* Get information about *all* installed memory */
908 detect_memory_memblock();
913 * Make sure all chunks are MAX_ORDER aligned so we don't need the
914 * extra checks that HOLES_IN_ZONE would require.
916 * Is this still required?
918 memblock_trim_memory(1UL << (MAX_ORDER - 1 + PAGE_SHIFT));
922 dma_contiguous_reserve(memory_end);
926 reserve_crashkernel();
927 #ifdef CONFIG_CRASH_DUMP
929 * Be aware that smp_save_dump_cpus() triggers a system reset.
930 * Therefore CPU and device initialization should be done afterwards.
932 smp_save_dump_cpus();
937 smp_fill_possible_mask();
938 cpu_detect_mhz_feature();
942 topology_init_early();
945 * Create kernel page tables and switch to virtual addressing.
949 /* Setup default console */
951 set_preferred_console();
953 apply_alternative_instructions();
955 /* Setup zfcpdump support */
958 /* Add system specific data to the random pool */