1 // SPDX-License-Identifier: GPL-2.0
4 * Copyright IBM Corp. 1999, 2012
5 * Author(s): Hartmut Penner (hp@de.ibm.com),
6 * Martin Schwidefsky (schwidefsky@de.ibm.com)
8 * Derived from "arch/i386/kernel/setup.c"
9 * Copyright (C) 1995, Linus Torvalds
13 * This file handles the architecture-dependent parts of initialization
16 #define KMSG_COMPONENT "setup"
17 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
19 #include <linux/errno.h>
20 #include <linux/export.h>
21 #include <linux/sched.h>
22 #include <linux/sched/task.h>
23 #include <linux/cpu.h>
24 #include <linux/kernel.h>
25 #include <linux/memblock.h>
27 #include <linux/stddef.h>
28 #include <linux/unistd.h>
29 #include <linux/ptrace.h>
30 #include <linux/random.h>
31 #include <linux/user.h>
32 #include <linux/tty.h>
33 #include <linux/ioport.h>
34 #include <linux/delay.h>
35 #include <linux/init.h>
36 #include <linux/initrd.h>
37 #include <linux/root_dev.h>
38 #include <linux/console.h>
39 #include <linux/kernel_stat.h>
40 #include <linux/dma-map-ops.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>
51 #include <linux/start_kernel.h>
52 #include <linux/hugetlb.h>
54 #include <asm/boot_data.h>
56 #include <asm/facility.h>
58 #include <asm/mmu_context.h>
59 #include <asm/cpcmd.h>
60 #include <asm/lowcore.h>
64 #include <asm/ptrace.h>
65 #include <asm/sections.h>
66 #include <asm/ebcdic.h>
68 #include <asm/os_info.h>
70 #include <asm/stacktrace.h>
71 #include <asm/sysinfo.h>
73 #include <asm/alternative.h>
74 #include <asm/nospec-branch.h>
75 #include <asm/mem_detect.h>
77 #include <asm/asm-offsets.h>
83 unsigned int console_mode = 0;
84 EXPORT_SYMBOL(console_mode);
86 unsigned int console_devno = -1;
87 EXPORT_SYMBOL(console_devno);
89 unsigned int console_irq = -1;
90 EXPORT_SYMBOL(console_irq);
92 unsigned long elf_hwcap __read_mostly = 0;
93 char elf_platform[ELF_PLATFORM_SIZE];
95 unsigned long int_hwcap = 0;
97 int __bootdata(noexec_disabled);
98 unsigned long __bootdata(ident_map_size);
99 struct mem_detect_info __bootdata(mem_detect);
101 struct exception_table_entry *__bootdata_preserved(__start_dma_ex_table);
102 struct exception_table_entry *__bootdata_preserved(__stop_dma_ex_table);
103 unsigned long __bootdata_preserved(__stext_dma);
104 unsigned long __bootdata_preserved(__etext_dma);
105 unsigned long __bootdata_preserved(__sdma);
106 unsigned long __bootdata_preserved(__edma);
107 unsigned long __bootdata_preserved(__kaslr_offset);
108 unsigned int __bootdata_preserved(zlib_dfltcc_support);
109 EXPORT_SYMBOL(zlib_dfltcc_support);
110 u64 __bootdata_preserved(stfle_fac_list[16]);
111 EXPORT_SYMBOL(stfle_fac_list);
112 u64 __bootdata_preserved(alt_stfle_fac_list[16]);
114 unsigned long VMALLOC_START;
115 EXPORT_SYMBOL(VMALLOC_START);
117 unsigned long VMALLOC_END;
118 EXPORT_SYMBOL(VMALLOC_END);
120 struct page *vmemmap;
121 EXPORT_SYMBOL(vmemmap);
122 unsigned long vmemmap_size;
124 unsigned long MODULES_VADDR;
125 unsigned long MODULES_END;
127 /* An array with a pointer to the lowcore of every CPU. */
128 struct lowcore *lowcore_ptr[NR_CPUS];
129 EXPORT_SYMBOL(lowcore_ptr);
132 * The Write Back bit position in the physaddr is given by the SLPC PCI.
133 * Leaving the mask zero always uses write through which is safe
135 unsigned long mio_wb_bit_mask __ro_after_init;
138 * This is set up by the setup-routine at boot-time
139 * for S390 need to find out, what we have to setup
140 * using address 0x10400 ...
143 #include <asm/setup.h>
146 * condev= and conmode= setup parameter.
149 static int __init condev_setup(char *str)
153 vdev = simple_strtoul(str, &str, 0);
154 if (vdev >= 0 && vdev < 65536) {
155 console_devno = vdev;
161 __setup("condev=", condev_setup);
163 static void __init set_preferred_console(void)
165 if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
166 add_preferred_console("ttyS", 0, NULL);
167 else if (CONSOLE_IS_3270)
168 add_preferred_console("tty3270", 0, NULL);
169 else if (CONSOLE_IS_VT220)
170 add_preferred_console("ttysclp", 0, NULL);
171 else if (CONSOLE_IS_HVC)
172 add_preferred_console("hvc", 0, NULL);
175 static int __init conmode_setup(char *str)
177 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
178 if (!strcmp(str, "hwc") || !strcmp(str, "sclp"))
181 #if defined(CONFIG_TN3215_CONSOLE)
182 if (!strcmp(str, "3215"))
185 #if defined(CONFIG_TN3270_CONSOLE)
186 if (!strcmp(str, "3270"))
189 set_preferred_console();
193 __setup("conmode=", conmode_setup);
195 static void __init conmode_default(void)
197 char query_buffer[1024];
201 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
202 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
203 ptr = strstr(query_buffer, "SUBCHANNEL =");
204 console_irq = simple_strtoul(ptr + 13, NULL, 16);
205 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
206 ptr = strstr(query_buffer, "CONMODE");
208 * Set the conmode to 3215 so that the device recognition
209 * will set the cu_type of the console to 3215. If the
210 * conmode is 3270 and we don't set it back then both
211 * 3215 and the 3270 driver will try to access the console
212 * device (3215 as console and 3270 as normal tty).
214 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
216 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
221 if (str_has_prefix(ptr + 8, "3270")) {
222 #if defined(CONFIG_TN3270_CONSOLE)
224 #elif defined(CONFIG_TN3215_CONSOLE)
226 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
229 } else if (str_has_prefix(ptr + 8, "3215")) {
230 #if defined(CONFIG_TN3215_CONSOLE)
232 #elif defined(CONFIG_TN3270_CONSOLE)
234 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
238 } else if (MACHINE_IS_KVM) {
239 if (sclp.has_vt220 && IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE))
241 else if (sclp.has_linemode && IS_ENABLED(CONFIG_SCLP_CONSOLE))
246 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
252 #ifdef CONFIG_CRASH_DUMP
253 static void __init setup_zfcpdump(void)
255 if (!is_ipl_type_dump())
259 strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev");
260 console_loglevel = 2;
263 static inline void setup_zfcpdump(void) {}
264 #endif /* CONFIG_CRASH_DUMP */
267 * Reboot, halt and power_off stubs. They just call _machine_restart,
268 * _machine_halt or _machine_power_off.
271 void machine_restart(char *command)
273 if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
275 * Only unblank the console if we are called in enabled
276 * context or a bust_spinlocks cleared the way for us.
279 _machine_restart(command);
282 void machine_halt(void)
284 if (!in_interrupt() || oops_in_progress)
286 * Only unblank the console if we are called in enabled
287 * context or a bust_spinlocks cleared the way for us.
293 void machine_power_off(void)
295 if (!in_interrupt() || oops_in_progress)
297 * Only unblank the console if we are called in enabled
298 * context or a bust_spinlocks cleared the way for us.
301 _machine_power_off();
305 * Dummy power off function.
307 void (*pm_power_off)(void) = machine_power_off;
308 EXPORT_SYMBOL_GPL(pm_power_off);
312 unsigned long stack_alloc(void)
314 #ifdef CONFIG_VMAP_STACK
315 return (unsigned long)__vmalloc_node(THREAD_SIZE, THREAD_SIZE,
316 THREADINFO_GFP, NUMA_NO_NODE,
317 __builtin_return_address(0));
319 return __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER);
323 void stack_free(unsigned long stack)
325 #ifdef CONFIG_VMAP_STACK
326 vfree((void *) stack);
328 free_pages(stack, THREAD_SIZE_ORDER);
332 int __init arch_early_irq_init(void)
336 stack = __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER);
338 panic("Couldn't allocate async stack");
339 S390_lowcore.async_stack = stack + STACK_INIT_OFFSET;
343 void __init arch_call_rest_init(void)
347 stack = stack_alloc();
349 panic("Couldn't allocate kernel stack");
350 current->stack = (void *) stack;
351 #ifdef CONFIG_VMAP_STACK
352 current->stack_vm_area = (void *) stack;
354 set_task_stack_end_magic(current);
355 stack += STACK_INIT_OFFSET;
356 S390_lowcore.kernel_stack = stack;
357 call_on_stack_noreturn(rest_init, stack);
360 static void __init setup_lowcore_dat_off(void)
362 unsigned long int_psw_mask = PSW_KERNEL_BITS;
363 unsigned long mcck_stack;
366 if (IS_ENABLED(CONFIG_KASAN))
367 int_psw_mask |= PSW_MASK_DAT;
370 * Setup lowcore for boot cpu
372 BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * PAGE_SIZE);
373 lc = memblock_alloc_low(sizeof(*lc), sizeof(*lc));
375 panic("%s: Failed to allocate %zu bytes align=%zx\n",
376 __func__, sizeof(*lc), sizeof(*lc));
378 lc->restart_psw.mask = PSW_KERNEL_BITS;
379 lc->restart_psw.addr = (unsigned long) restart_int_handler;
380 lc->external_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK;
381 lc->external_new_psw.addr = (unsigned long) ext_int_handler;
382 lc->svc_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK;
383 lc->svc_new_psw.addr = (unsigned long) system_call;
384 lc->program_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK;
385 lc->program_new_psw.addr = (unsigned long) pgm_check_handler;
386 lc->mcck_new_psw.mask = PSW_KERNEL_BITS;
387 lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler;
388 lc->io_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK;
389 lc->io_new_psw.addr = (unsigned long) io_int_handler;
390 lc->clock_comparator = clock_comparator_max;
391 lc->nodat_stack = ((unsigned long) &init_thread_union)
392 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
393 lc->current_task = (unsigned long)&init_task;
395 lc->machine_flags = S390_lowcore.machine_flags;
396 lc->preempt_count = S390_lowcore.preempt_count;
397 nmi_alloc_boot_cpu(lc);
398 lc->sys_enter_timer = S390_lowcore.sys_enter_timer;
399 lc->exit_timer = S390_lowcore.exit_timer;
400 lc->user_timer = S390_lowcore.user_timer;
401 lc->system_timer = S390_lowcore.system_timer;
402 lc->steal_timer = S390_lowcore.steal_timer;
403 lc->last_update_timer = S390_lowcore.last_update_timer;
404 lc->last_update_clock = S390_lowcore.last_update_clock;
407 * Allocate the global restart stack which is the same for
408 * all CPUs in cast *one* of them does a PSW restart.
410 restart_stack = memblock_alloc(THREAD_SIZE, THREAD_SIZE);
412 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
413 __func__, THREAD_SIZE, THREAD_SIZE);
414 restart_stack += STACK_INIT_OFFSET;
417 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant
418 * restart data to the absolute zero lowcore. This is necessary if
419 * PSW restart is done on an offline CPU that has lowcore zero.
421 lc->restart_stack = (unsigned long) restart_stack;
422 lc->restart_fn = (unsigned long) do_restart;
423 lc->restart_data = 0;
424 lc->restart_source = -1UL;
426 mcck_stack = (unsigned long)memblock_alloc(THREAD_SIZE, THREAD_SIZE);
428 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
429 __func__, THREAD_SIZE, THREAD_SIZE);
430 lc->mcck_stack = mcck_stack + STACK_INIT_OFFSET;
432 /* Setup absolute zero lowcore */
433 mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack);
434 mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn);
435 mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data);
436 mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source);
437 mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw);
439 lc->spinlock_lockval = arch_spin_lockval(0);
440 lc->spinlock_index = 0;
441 arch_spin_lock_setup(0);
442 lc->br_r1_trampoline = 0x07f1; /* br %r1 */
443 lc->return_lpswe = gen_lpswe(__LC_RETURN_PSW);
444 lc->return_mcck_lpswe = gen_lpswe(__LC_RETURN_MCCK_PSW);
445 lc->preempt_count = PREEMPT_DISABLED;
447 set_prefix((u32)(unsigned long) lc);
451 static void __init setup_lowcore_dat_on(void)
453 __ctl_clear_bit(0, 28);
454 S390_lowcore.external_new_psw.mask |= PSW_MASK_DAT;
455 S390_lowcore.svc_new_psw.mask |= PSW_MASK_DAT;
456 S390_lowcore.program_new_psw.mask |= PSW_MASK_DAT;
457 S390_lowcore.io_new_psw.mask |= PSW_MASK_DAT;
458 __ctl_set_bit(0, 28);
461 static struct resource code_resource = {
462 .name = "Kernel code",
463 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
466 static struct resource data_resource = {
467 .name = "Kernel data",
468 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
471 static struct resource bss_resource = {
472 .name = "Kernel bss",
473 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
476 static struct resource __initdata *standard_resources[] = {
482 static void __init setup_resources(void)
484 struct resource *res, *std_res, *sub_res;
485 phys_addr_t start, end;
489 code_resource.start = (unsigned long) _text;
490 code_resource.end = (unsigned long) _etext - 1;
491 data_resource.start = (unsigned long) _etext;
492 data_resource.end = (unsigned long) _edata - 1;
493 bss_resource.start = (unsigned long) __bss_start;
494 bss_resource.end = (unsigned long) __bss_stop - 1;
496 for_each_mem_range(i, &start, &end) {
497 res = memblock_alloc(sizeof(*res), 8);
499 panic("%s: Failed to allocate %zu bytes align=0x%x\n",
500 __func__, sizeof(*res), 8);
501 res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM;
503 res->name = "System RAM";
506 * In memblock, end points to the first byte after the
507 * range while in resourses, end points to the last byte in
511 request_resource(&iomem_resource, res);
513 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
514 std_res = standard_resources[j];
515 if (std_res->start < res->start ||
516 std_res->start > res->end)
518 if (std_res->end > res->end) {
519 sub_res = memblock_alloc(sizeof(*sub_res), 8);
521 panic("%s: Failed to allocate %zu bytes align=0x%x\n",
522 __func__, sizeof(*sub_res), 8);
524 sub_res->end = res->end;
525 std_res->start = res->end + 1;
526 request_resource(res, sub_res);
528 request_resource(res, std_res);
532 #ifdef CONFIG_CRASH_DUMP
534 * Re-add removed crash kernel memory as reserved memory. This makes
535 * sure it will be mapped with the identity mapping and struct pages
536 * will be created, so it can be resized later on.
537 * However add it later since the crash kernel resource should not be
538 * part of the System RAM resource.
540 if (crashk_res.end) {
541 memblock_add_node(crashk_res.start, resource_size(&crashk_res), 0);
542 memblock_reserve(crashk_res.start, resource_size(&crashk_res));
543 insert_resource(&iomem_resource, &crashk_res);
548 static void __init setup_memory_end(void)
550 memblock_remove(ident_map_size, ULONG_MAX);
551 max_pfn = max_low_pfn = PFN_DOWN(ident_map_size);
552 pr_notice("The maximum memory size is %luMB\n", ident_map_size >> 20);
555 #ifdef CONFIG_CRASH_DUMP
558 * When kdump is enabled, we have to ensure that no memory from the area
559 * [0 - crashkernel memory size] is set offline - it will be exchanged with
560 * the crashkernel memory region when kdump is triggered. The crashkernel
561 * memory region can never get offlined (pages are unmovable).
563 static int kdump_mem_notifier(struct notifier_block *nb,
564 unsigned long action, void *data)
566 struct memory_notify *arg = data;
568 if (action != MEM_GOING_OFFLINE)
570 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
575 static struct notifier_block kdump_mem_nb = {
576 .notifier_call = kdump_mem_notifier,
582 * Make sure that the area above identity mapping is protected
584 static void __init reserve_above_ident_map(void)
586 memblock_reserve(ident_map_size, ULONG_MAX);
590 * Reserve memory for kdump kernel to be loaded with kexec
592 static void __init reserve_crashkernel(void)
594 #ifdef CONFIG_CRASH_DUMP
595 unsigned long long crash_base, crash_size;
596 phys_addr_t low, high;
599 rc = parse_crashkernel(boot_command_line, ident_map_size, &crash_size,
602 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
603 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
604 if (rc || crash_size == 0)
607 if (memblock.memory.regions[0].size < crash_size) {
608 pr_info("crashkernel reservation failed: %s\n",
609 "first memory chunk must be at least crashkernel size");
613 low = crash_base ?: OLDMEM_BASE;
614 high = low + crash_size;
615 if (low >= OLDMEM_BASE && high <= OLDMEM_BASE + OLDMEM_SIZE) {
616 /* The crashkernel fits into OLDMEM, reuse OLDMEM */
619 /* Find suitable area in free memory */
620 low = max_t(unsigned long, crash_size, sclp.hsa_size);
621 high = crash_base ? crash_base + crash_size : ULONG_MAX;
623 if (crash_base && crash_base < low) {
624 pr_info("crashkernel reservation failed: %s\n",
625 "crash_base too low");
628 low = crash_base ?: low;
629 crash_base = memblock_find_in_range(low, high, crash_size,
630 KEXEC_CRASH_MEM_ALIGN);
634 pr_info("crashkernel reservation failed: %s\n",
635 "no suitable area found");
639 if (register_memory_notifier(&kdump_mem_nb))
642 if (!OLDMEM_BASE && MACHINE_IS_VM)
643 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
644 crashk_res.start = crash_base;
645 crashk_res.end = crash_base + crash_size - 1;
646 memblock_remove(crash_base, crash_size);
647 pr_info("Reserving %lluMB of memory at %lluMB "
648 "for crashkernel (System RAM: %luMB)\n",
649 crash_size >> 20, crash_base >> 20,
650 (unsigned long)memblock.memory.total_size >> 20);
651 os_info_crashkernel_add(crash_base, crash_size);
656 * Reserve the initrd from being used by memblock
658 static void __init reserve_initrd(void)
660 #ifdef CONFIG_BLK_DEV_INITRD
661 if (!INITRD_START || !INITRD_SIZE)
663 initrd_start = INITRD_START;
664 initrd_end = initrd_start + INITRD_SIZE;
665 memblock_reserve(INITRD_START, INITRD_SIZE);
670 * Reserve the memory area used to pass the certificate lists
672 static void __init reserve_certificate_list(void)
674 if (ipl_cert_list_addr)
675 memblock_reserve(ipl_cert_list_addr, ipl_cert_list_size);
678 static void __init reserve_mem_detect_info(void)
680 unsigned long start, size;
682 get_mem_detect_reserved(&start, &size);
684 memblock_reserve(start, size);
687 static void __init free_mem_detect_info(void)
689 unsigned long start, size;
691 get_mem_detect_reserved(&start, &size);
693 memblock_free(start, size);
696 static const char * __init get_mem_info_source(void)
698 switch (mem_detect.info_source) {
699 case MEM_DETECT_SCLP_STOR_INFO:
700 return "sclp storage info";
701 case MEM_DETECT_DIAG260:
703 case MEM_DETECT_SCLP_READ_INFO:
704 return "sclp read info";
705 case MEM_DETECT_BIN_SEARCH:
706 return "binary search";
711 static void __init memblock_add_mem_detect_info(void)
713 unsigned long start, end;
716 pr_debug("physmem info source: %s (%hhd)\n",
717 get_mem_info_source(), mem_detect.info_source);
718 /* keep memblock lists close to the kernel */
719 memblock_set_bottom_up(true);
720 for_each_mem_detect_block(i, &start, &end) {
721 memblock_add(start, end - start);
722 memblock_physmem_add(start, end - start);
724 memblock_set_bottom_up(false);
725 memblock_set_node(0, ULONG_MAX, &memblock.memory, 0);
730 * Check for initrd being in usable memory
732 static void __init check_initrd(void)
734 #ifdef CONFIG_BLK_DEV_INITRD
735 if (INITRD_START && INITRD_SIZE &&
736 !memblock_is_region_memory(INITRD_START, INITRD_SIZE)) {
737 pr_err("The initial RAM disk does not fit into the memory\n");
738 memblock_free(INITRD_START, INITRD_SIZE);
739 initrd_start = initrd_end = 0;
745 * Reserve memory used for lowcore/command line/kernel image.
747 static void __init reserve_kernel(void)
749 unsigned long start_pfn = PFN_UP(__pa(_end));
751 memblock_reserve(0, HEAD_END);
752 memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn)
753 - (unsigned long)_stext);
754 memblock_reserve(__sdma, __edma - __sdma);
757 static void __init setup_memory(void)
759 phys_addr_t start, end;
763 * Init storage key for present memory
765 for_each_mem_range(i, &start, &end)
766 storage_key_init_range(start, end);
768 psw_set_key(PAGE_DEFAULT_KEY);
771 memblock_enforce_memory_limit(memblock_end_of_DRAM());
775 * Setup hardware capabilities.
777 static int __init setup_hwcaps(void)
779 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
784 * The store facility list bits numbers as found in the principles
785 * of operation are numbered with bit 1UL<<31 as number 0 to
786 * bit 1UL<<0 as number 31.
787 * Bit 0: instructions named N3, "backported" to esa-mode
788 * Bit 2: z/Architecture mode is active
789 * Bit 7: the store-facility-list-extended facility is installed
790 * Bit 17: the message-security assist is installed
791 * Bit 19: the long-displacement facility is installed
792 * Bit 21: the extended-immediate facility is installed
793 * Bit 22: extended-translation facility 3 is installed
794 * Bit 30: extended-translation facility 3 enhancement facility
795 * These get translated to:
796 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
797 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
798 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
799 * HWCAP_S390_ETF3EH bit 8 (22 && 30).
801 for (i = 0; i < 6; i++)
802 if (test_facility(stfl_bits[i]))
803 elf_hwcap |= 1UL << i;
805 if (test_facility(22) && test_facility(30))
806 elf_hwcap |= HWCAP_S390_ETF3EH;
809 * Check for additional facilities with store-facility-list-extended.
810 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
811 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
812 * as stored by stfl, bits 32-xxx contain additional facilities.
813 * How many facility words are stored depends on the number of
814 * doublewords passed to the instruction. The additional facilities
816 * Bit 42: decimal floating point facility is installed
817 * Bit 44: perform floating point operation facility is installed
819 * HWCAP_S390_DFP bit 6 (42 && 44).
821 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
822 elf_hwcap |= HWCAP_S390_DFP;
825 * Huge page support HWCAP_S390_HPAGE is bit 7.
827 if (MACHINE_HAS_EDAT1)
828 elf_hwcap |= HWCAP_S390_HPAGE;
831 * 64-bit register support for 31-bit processes
832 * HWCAP_S390_HIGH_GPRS is bit 9.
834 elf_hwcap |= HWCAP_S390_HIGH_GPRS;
837 * Transactional execution support HWCAP_S390_TE is bit 10.
840 elf_hwcap |= HWCAP_S390_TE;
843 * Vector extension HWCAP_S390_VXRS is bit 11. The Vector extension
844 * can be disabled with the "novx" parameter. Use MACHINE_HAS_VX
845 * instead of facility bit 129.
847 if (MACHINE_HAS_VX) {
848 elf_hwcap |= HWCAP_S390_VXRS;
849 if (test_facility(134))
850 elf_hwcap |= HWCAP_S390_VXRS_BCD;
851 if (test_facility(135))
852 elf_hwcap |= HWCAP_S390_VXRS_EXT;
853 if (test_facility(148))
854 elf_hwcap |= HWCAP_S390_VXRS_EXT2;
855 if (test_facility(152))
856 elf_hwcap |= HWCAP_S390_VXRS_PDE;
858 if (test_facility(150))
859 elf_hwcap |= HWCAP_S390_SORT;
860 if (test_facility(151))
861 elf_hwcap |= HWCAP_S390_DFLT;
864 * Guarded storage support HWCAP_S390_GS is bit 12.
867 elf_hwcap |= HWCAP_S390_GS;
870 add_device_randomness(&cpu_id, sizeof(cpu_id));
871 switch (cpu_id.machine) {
874 default: /* Use "z900" as default for 64 bit kernels. */
875 strcpy(elf_platform, "z900");
879 strcpy(elf_platform, "z990");
883 strcpy(elf_platform, "z9-109");
887 strcpy(elf_platform, "z10");
891 strcpy(elf_platform, "z196");
895 strcpy(elf_platform, "zEC12");
899 strcpy(elf_platform, "z13");
903 strcpy(elf_platform, "z14");
907 strcpy(elf_platform, "z15");
912 * Virtualization support HWCAP_INT_SIE is bit 0.
915 int_hwcap |= HWCAP_INT_SIE;
919 arch_initcall(setup_hwcaps);
922 * Add system information as device randomness
924 static void __init setup_randomness(void)
926 struct sysinfo_3_2_2 *vmms;
928 vmms = (struct sysinfo_3_2_2 *) memblock_phys_alloc(PAGE_SIZE,
931 panic("Failed to allocate memory for sysinfo structure\n");
933 if (stsi(vmms, 3, 2, 2) == 0 && vmms->count)
934 add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count);
935 memblock_free((unsigned long) vmms, PAGE_SIZE);
939 * Find the correct size for the task_struct. This depends on
940 * the size of the struct fpu at the end of the thread_struct
941 * which is embedded in the task_struct.
943 static void __init setup_task_size(void)
945 int task_size = sizeof(struct task_struct);
947 if (!MACHINE_HAS_VX) {
948 task_size -= sizeof(__vector128) * __NUM_VXRS;
949 task_size += sizeof(freg_t) * __NUM_FPRS;
951 arch_task_struct_size = task_size;
955 * Issue diagnose 318 to set the control program name and
958 static void __init setup_control_program_code(void)
960 union diag318_info diag318_info = {
965 if (!sclp.has_diag318)
968 diag_stat_inc(DIAG_STAT_X318);
969 asm volatile("diag %0,0,0x318\n" : : "d" (diag318_info.val));
973 * Print the component list from the IPL report
975 static void __init log_component_list(void)
977 struct ipl_rb_component_entry *ptr, *end;
980 if (!early_ipl_comp_list_addr)
982 if (ipl_block.hdr.flags & IPL_PL_FLAG_SIPL)
983 pr_info("Linux is running with Secure-IPL enabled\n");
985 pr_info("Linux is running with Secure-IPL disabled\n");
986 ptr = (void *) early_ipl_comp_list_addr;
987 end = (void *) ptr + early_ipl_comp_list_size;
988 pr_info("The IPL report contains the following components:\n");
990 if (ptr->flags & IPL_RB_COMPONENT_FLAG_SIGNED) {
991 if (ptr->flags & IPL_RB_COMPONENT_FLAG_VERIFIED)
992 str = "signed, verified";
994 str = "signed, verification failed";
998 pr_info("%016llx - %016llx (%s)\n",
999 ptr->addr, ptr->addr + ptr->len, str);
1005 * Setup function called from init/main.c just after the banner
1009 void __init setup_arch(char **cmdline_p)
1012 * print what head.S has found out about the machine
1015 pr_info("Linux is running as a z/VM "
1016 "guest operating system in 64-bit mode\n");
1017 else if (MACHINE_IS_KVM)
1018 pr_info("Linux is running under KVM in 64-bit mode\n");
1019 else if (MACHINE_IS_LPAR)
1020 pr_info("Linux is running natively in 64-bit mode\n");
1022 pr_info("Linux is running as a guest in 64-bit mode\n");
1024 log_component_list();
1026 /* Have one command line that is parsed and saved in /proc/cmdline */
1027 /* boot_command_line has been already set up in early.c */
1028 *cmdline_p = boot_command_line;
1030 ROOT_DEV = Root_RAM0;
1032 setup_initial_init_mm(_text, _etext, _edata, _end);
1034 if (IS_ENABLED(CONFIG_EXPOLINE_AUTO))
1035 nospec_auto_detect();
1038 parse_early_param();
1039 #ifdef CONFIG_CRASH_DUMP
1040 /* Deactivate elfcorehdr= kernel parameter */
1041 elfcorehdr_addr = ELFCORE_ADDR_MAX;
1047 setup_control_program_code();
1049 /* Do some memory reservations *before* memory is added to memblock */
1050 reserve_above_ident_map();
1053 reserve_certificate_list();
1054 reserve_mem_detect_info();
1055 memblock_allow_resize();
1057 /* Get information about *all* installed memory */
1058 memblock_add_mem_detect_info();
1060 free_mem_detect_info();
1065 dma_contiguous_reserve(ident_map_size);
1067 if (MACHINE_HAS_EDAT2)
1068 hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT);
1071 reserve_crashkernel();
1072 #ifdef CONFIG_CRASH_DUMP
1074 * Be aware that smp_save_dump_cpus() triggers a system reset.
1075 * Therefore CPU and device initialization should be done afterwards.
1077 smp_save_dump_cpus();
1081 setup_lowcore_dat_off();
1082 smp_fill_possible_mask();
1083 cpu_detect_mhz_feature();
1087 topology_init_early();
1090 * Create kernel page tables and switch to virtual addressing.
1095 * After paging_init created the kernel page table, the new PSWs
1096 * in lowcore can now run with DAT enabled.
1098 setup_lowcore_dat_on();
1100 /* Setup default console */
1102 set_preferred_console();
1104 apply_alternative_instructions();
1105 if (IS_ENABLED(CONFIG_EXPOLINE))
1106 nospec_init_branches();
1108 /* Setup zfcp/nvme dump support */
1111 /* Add system specific data to the random pool */