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-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>
51 #include <linux/start_kernel.h>
53 #include <asm/boot_data.h>
55 #include <asm/facility.h>
57 #include <asm/mmu_context.h>
58 #include <asm/cpcmd.h>
59 #include <asm/lowcore.h>
63 #include <asm/ptrace.h>
64 #include <asm/sections.h>
65 #include <asm/ebcdic.h>
67 #include <asm/os_info.h>
69 #include <asm/stacktrace.h>
70 #include <asm/sysinfo.h>
72 #include <asm/alternative.h>
73 #include <asm/nospec-branch.h>
74 #include <asm/mem_detect.h>
76 #include <asm/asm-offsets.h>
82 unsigned int console_mode = 0;
83 EXPORT_SYMBOL(console_mode);
85 unsigned int console_devno = -1;
86 EXPORT_SYMBOL(console_devno);
88 unsigned int console_irq = -1;
89 EXPORT_SYMBOL(console_irq);
91 unsigned long elf_hwcap __read_mostly = 0;
92 char elf_platform[ELF_PLATFORM_SIZE];
94 unsigned long int_hwcap = 0;
96 int __bootdata(noexec_disabled);
97 int __bootdata(memory_end_set);
98 unsigned long __bootdata(memory_end);
99 unsigned long __bootdata(vmalloc_size);
100 unsigned long __bootdata(max_physmem_end);
101 struct mem_detect_info __bootdata(mem_detect);
103 struct exception_table_entry *__bootdata_preserved(__start_dma_ex_table);
104 struct exception_table_entry *__bootdata_preserved(__stop_dma_ex_table);
105 unsigned long __bootdata_preserved(__swsusp_reset_dma);
106 unsigned long __bootdata_preserved(__stext_dma);
107 unsigned long __bootdata_preserved(__etext_dma);
108 unsigned long __bootdata_preserved(__sdma);
109 unsigned long __bootdata_preserved(__edma);
110 unsigned long __bootdata_preserved(__kaslr_offset);
111 unsigned int __bootdata_preserved(zlib_dfltcc_support);
112 EXPORT_SYMBOL(zlib_dfltcc_support);
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);
123 unsigned long MODULES_VADDR;
124 unsigned long MODULES_END;
126 /* An array with a pointer to the lowcore of every CPU. */
127 struct lowcore *lowcore_ptr[NR_CPUS];
128 EXPORT_SYMBOL(lowcore_ptr);
131 * This is set up by the setup-routine at boot-time
132 * for S390 need to find out, what we have to setup
133 * using address 0x10400 ...
136 #include <asm/setup.h>
139 * condev= and conmode= setup parameter.
142 static int __init condev_setup(char *str)
146 vdev = simple_strtoul(str, &str, 0);
147 if (vdev >= 0 && vdev < 65536) {
148 console_devno = vdev;
154 __setup("condev=", condev_setup);
156 static void __init set_preferred_console(void)
158 if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
159 add_preferred_console("ttyS", 0, NULL);
160 else if (CONSOLE_IS_3270)
161 add_preferred_console("tty3270", 0, NULL);
162 else if (CONSOLE_IS_VT220)
163 add_preferred_console("ttyS", 1, NULL);
164 else if (CONSOLE_IS_HVC)
165 add_preferred_console("hvc", 0, NULL);
168 static int __init conmode_setup(char *str)
170 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
171 if (!strcmp(str, "hwc") || !strcmp(str, "sclp"))
174 #if defined(CONFIG_TN3215_CONSOLE)
175 if (!strcmp(str, "3215"))
178 #if defined(CONFIG_TN3270_CONSOLE)
179 if (!strcmp(str, "3270"))
182 set_preferred_console();
186 __setup("conmode=", conmode_setup);
188 static void __init conmode_default(void)
190 char query_buffer[1024];
194 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
195 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
196 ptr = strstr(query_buffer, "SUBCHANNEL =");
197 console_irq = simple_strtoul(ptr + 13, NULL, 16);
198 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
199 ptr = strstr(query_buffer, "CONMODE");
201 * Set the conmode to 3215 so that the device recognition
202 * will set the cu_type of the console to 3215. If the
203 * conmode is 3270 and we don't set it back then both
204 * 3215 and the 3270 driver will try to access the console
205 * device (3215 as console and 3270 as normal tty).
207 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
209 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
214 if (str_has_prefix(ptr + 8, "3270")) {
215 #if defined(CONFIG_TN3270_CONSOLE)
217 #elif defined(CONFIG_TN3215_CONSOLE)
219 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
222 } else if (str_has_prefix(ptr + 8, "3215")) {
223 #if defined(CONFIG_TN3215_CONSOLE)
225 #elif defined(CONFIG_TN3270_CONSOLE)
227 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
231 } else if (MACHINE_IS_KVM) {
232 if (sclp.has_vt220 && IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE))
234 else if (sclp.has_linemode && IS_ENABLED(CONFIG_SCLP_CONSOLE))
239 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
245 #ifdef CONFIG_CRASH_DUMP
246 static void __init setup_zfcpdump(void)
248 if (ipl_info.type != IPL_TYPE_FCP_DUMP)
252 strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev");
253 console_loglevel = 2;
256 static inline void setup_zfcpdump(void) {}
257 #endif /* CONFIG_CRASH_DUMP */
260 * Reboot, halt and power_off stubs. They just call _machine_restart,
261 * _machine_halt or _machine_power_off.
264 void machine_restart(char *command)
266 if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
268 * Only unblank the console if we are called in enabled
269 * context or a bust_spinlocks cleared the way for us.
272 _machine_restart(command);
275 void machine_halt(void)
277 if (!in_interrupt() || oops_in_progress)
279 * Only unblank the console if we are called in enabled
280 * context or a bust_spinlocks cleared the way for us.
286 void machine_power_off(void)
288 if (!in_interrupt() || oops_in_progress)
290 * Only unblank the console if we are called in enabled
291 * context or a bust_spinlocks cleared the way for us.
294 _machine_power_off();
298 * Dummy power off function.
300 void (*pm_power_off)(void) = machine_power_off;
301 EXPORT_SYMBOL_GPL(pm_power_off);
303 void *restart_stack __section(.data);
305 unsigned long stack_alloc(void)
307 #ifdef CONFIG_VMAP_STACK
308 return (unsigned long)__vmalloc_node(THREAD_SIZE, THREAD_SIZE,
309 THREADINFO_GFP, NUMA_NO_NODE,
310 __builtin_return_address(0));
312 return __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER);
316 void stack_free(unsigned long stack)
318 #ifdef CONFIG_VMAP_STACK
319 vfree((void *) stack);
321 free_pages(stack, THREAD_SIZE_ORDER);
325 int __init arch_early_irq_init(void)
329 stack = __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER);
331 panic("Couldn't allocate async stack");
332 S390_lowcore.async_stack = stack + STACK_INIT_OFFSET;
336 static int __init async_stack_realloc(void)
338 unsigned long old, new;
340 old = S390_lowcore.async_stack - STACK_INIT_OFFSET;
343 panic("Couldn't allocate async stack");
344 S390_lowcore.async_stack = new + STACK_INIT_OFFSET;
345 free_pages(old, THREAD_SIZE_ORDER);
348 early_initcall(async_stack_realloc);
350 void __init arch_call_rest_init(void)
354 stack = stack_alloc();
356 panic("Couldn't allocate kernel stack");
357 current->stack = (void *) stack;
358 #ifdef CONFIG_VMAP_STACK
359 current->stack_vm_area = (void *) stack;
361 set_task_stack_end_magic(current);
362 stack += STACK_INIT_OFFSET;
363 S390_lowcore.kernel_stack = stack;
364 CALL_ON_STACK_NORETURN(rest_init, stack);
367 static void __init setup_lowcore_dat_off(void)
372 * Setup lowcore for boot cpu
374 BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * PAGE_SIZE);
375 lc = memblock_alloc_low(sizeof(*lc), sizeof(*lc));
377 panic("%s: Failed to allocate %zu bytes align=%zx\n",
378 __func__, sizeof(*lc), sizeof(*lc));
380 lc->restart_psw.mask = PSW_KERNEL_BITS;
381 lc->restart_psw.addr = (unsigned long) restart_int_handler;
382 lc->external_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK;
383 lc->external_new_psw.addr = (unsigned long) ext_int_handler;
384 lc->svc_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK;
385 lc->svc_new_psw.addr = (unsigned long) system_call;
386 lc->program_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK;
387 lc->program_new_psw.addr = (unsigned long) pgm_check_handler;
388 lc->mcck_new_psw.mask = PSW_KERNEL_BITS;
389 lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler;
390 lc->io_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK;
391 lc->io_new_psw.addr = (unsigned long) io_int_handler;
392 lc->clock_comparator = clock_comparator_max;
393 lc->nodat_stack = ((unsigned long) &init_thread_union)
394 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
395 lc->current_task = (unsigned long)&init_task;
397 lc->machine_flags = S390_lowcore.machine_flags;
398 lc->preempt_count = S390_lowcore.preempt_count;
399 lc->stfl_fac_list = S390_lowcore.stfl_fac_list;
400 memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
401 sizeof(lc->stfle_fac_list));
402 memcpy(lc->alt_stfle_fac_list, S390_lowcore.alt_stfle_fac_list,
403 sizeof(lc->alt_stfle_fac_list));
404 nmi_alloc_boot_cpu(lc);
405 vdso_alloc_boot_cpu(lc);
406 lc->sync_enter_timer = S390_lowcore.sync_enter_timer;
407 lc->async_enter_timer = S390_lowcore.async_enter_timer;
408 lc->exit_timer = S390_lowcore.exit_timer;
409 lc->user_timer = S390_lowcore.user_timer;
410 lc->system_timer = S390_lowcore.system_timer;
411 lc->steal_timer = S390_lowcore.steal_timer;
412 lc->last_update_timer = S390_lowcore.last_update_timer;
413 lc->last_update_clock = S390_lowcore.last_update_clock;
416 * Allocate the global restart stack which is the same for
417 * all CPUs in cast *one* of them does a PSW restart.
419 restart_stack = memblock_alloc(THREAD_SIZE, THREAD_SIZE);
421 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
422 __func__, THREAD_SIZE, THREAD_SIZE);
423 restart_stack += STACK_INIT_OFFSET;
426 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant
427 * restart data to the absolute zero lowcore. This is necessary if
428 * PSW restart is done on an offline CPU that has lowcore zero.
430 lc->restart_stack = (unsigned long) restart_stack;
431 lc->restart_fn = (unsigned long) do_restart;
432 lc->restart_data = 0;
433 lc->restart_source = -1UL;
435 /* Setup absolute zero lowcore */
436 mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack);
437 mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn);
438 mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data);
439 mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source);
440 mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw);
442 lc->spinlock_lockval = arch_spin_lockval(0);
443 lc->spinlock_index = 0;
444 arch_spin_lock_setup(0);
445 lc->br_r1_trampoline = 0x07f1; /* br %r1 */
446 lc->return_lpswe = gen_lpswe(__LC_RETURN_PSW);
447 lc->return_mcck_lpswe = gen_lpswe(__LC_RETURN_MCCK_PSW);
449 set_prefix((u32)(unsigned long) lc);
453 static void __init setup_lowcore_dat_on(void)
455 __ctl_clear_bit(0, 28);
456 S390_lowcore.external_new_psw.mask |= PSW_MASK_DAT;
457 S390_lowcore.svc_new_psw.mask |= PSW_MASK_DAT;
458 S390_lowcore.program_new_psw.mask |= PSW_MASK_DAT;
459 S390_lowcore.io_new_psw.mask |= PSW_MASK_DAT;
460 __ctl_set_bit(0, 28);
463 static struct resource code_resource = {
464 .name = "Kernel code",
465 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
468 static struct resource data_resource = {
469 .name = "Kernel data",
470 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
473 static struct resource bss_resource = {
474 .name = "Kernel bss",
475 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
478 static struct resource __initdata *standard_resources[] = {
484 static void __init setup_resources(void)
486 struct resource *res, *std_res, *sub_res;
487 struct memblock_region *reg;
490 code_resource.start = (unsigned long) _text;
491 code_resource.end = (unsigned long) _etext - 1;
492 data_resource.start = (unsigned long) _etext;
493 data_resource.end = (unsigned long) _edata - 1;
494 bss_resource.start = (unsigned long) __bss_start;
495 bss_resource.end = (unsigned long) __bss_stop - 1;
497 for_each_memblock(memory, reg) {
498 res = memblock_alloc(sizeof(*res), 8);
500 panic("%s: Failed to allocate %zu bytes align=0x%x\n",
501 __func__, sizeof(*res), 8);
502 res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM;
504 res->name = "System RAM";
505 res->start = reg->base;
506 res->end = reg->base + reg->size - 1;
507 request_resource(&iomem_resource, res);
509 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
510 std_res = standard_resources[j];
511 if (std_res->start < res->start ||
512 std_res->start > res->end)
514 if (std_res->end > res->end) {
515 sub_res = memblock_alloc(sizeof(*sub_res), 8);
517 panic("%s: Failed to allocate %zu bytes align=0x%x\n",
518 __func__, sizeof(*sub_res), 8);
520 sub_res->end = res->end;
521 std_res->start = res->end + 1;
522 request_resource(res, sub_res);
524 request_resource(res, std_res);
528 #ifdef CONFIG_CRASH_DUMP
530 * Re-add removed crash kernel memory as reserved memory. This makes
531 * sure it will be mapped with the identity mapping and struct pages
532 * will be created, so it can be resized later on.
533 * However add it later since the crash kernel resource should not be
534 * part of the System RAM resource.
536 if (crashk_res.end) {
537 memblock_add_node(crashk_res.start, resource_size(&crashk_res), 0);
538 memblock_reserve(crashk_res.start, resource_size(&crashk_res));
539 insert_resource(&iomem_resource, &crashk_res);
544 static void __init setup_memory_end(void)
546 unsigned long vmax, tmp;
548 /* Choose kernel address space layout: 3 or 4 levels. */
549 if (IS_ENABLED(CONFIG_KASAN)) {
550 vmax = IS_ENABLED(CONFIG_KASAN_S390_4_LEVEL_PAGING)
554 tmp = (memory_end ?: max_physmem_end) / PAGE_SIZE;
555 tmp = tmp * (sizeof(struct page) + PAGE_SIZE);
556 if (tmp + vmalloc_size + MODULES_LEN <= _REGION2_SIZE)
557 vmax = _REGION2_SIZE; /* 3-level kernel page table */
559 vmax = _REGION1_SIZE; /* 4-level kernel page table */
562 if (is_prot_virt_host())
563 adjust_to_uv_max(&vmax);
565 /* module area is at the end of the kernel address space. */
567 MODULES_VADDR = MODULES_END - MODULES_LEN;
568 VMALLOC_END = MODULES_VADDR;
569 VMALLOC_START = VMALLOC_END - vmalloc_size;
571 /* Split remaining virtual space between 1:1 mapping & vmemmap array */
572 tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page));
573 /* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */
574 tmp = SECTION_ALIGN_UP(tmp);
575 tmp = VMALLOC_START - tmp * sizeof(struct page);
576 tmp &= ~((vmax >> 11) - 1); /* align to page table level */
577 tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS);
578 vmemmap = (struct page *) tmp;
580 /* Take care that memory_end is set and <= vmemmap */
581 memory_end = min(memory_end ?: max_physmem_end, (unsigned long)vmemmap);
583 /* fit in kasan shadow memory region between 1:1 and vmemmap */
584 memory_end = min(memory_end, KASAN_SHADOW_START);
585 vmemmap = max(vmemmap, (struct page *)KASAN_SHADOW_END);
587 max_pfn = max_low_pfn = PFN_DOWN(memory_end);
588 memblock_remove(memory_end, ULONG_MAX);
590 pr_notice("The maximum memory size is %luMB\n", memory_end >> 20);
593 #ifdef CONFIG_CRASH_DUMP
596 * When kdump is enabled, we have to ensure that no memory from the area
597 * [0 - crashkernel memory size] is set offline - it will be exchanged with
598 * the crashkernel memory region when kdump is triggered. The crashkernel
599 * memory region can never get offlined (pages are unmovable).
601 static int kdump_mem_notifier(struct notifier_block *nb,
602 unsigned long action, void *data)
604 struct memory_notify *arg = data;
606 if (action != MEM_GOING_OFFLINE)
608 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
613 static struct notifier_block kdump_mem_nb = {
614 .notifier_call = kdump_mem_notifier,
620 * Make sure that the area behind memory_end is protected
622 static void __init reserve_memory_end(void)
625 memblock_reserve(memory_end, ULONG_MAX);
629 * Make sure that oldmem, where the dump is stored, is protected
631 static void __init reserve_oldmem(void)
633 #ifdef CONFIG_CRASH_DUMP
635 /* Forget all memory above the running kdump system */
636 memblock_reserve(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX);
641 * Make sure that oldmem, where the dump is stored, is protected
643 static void __init remove_oldmem(void)
645 #ifdef CONFIG_CRASH_DUMP
647 /* Forget all memory above the running kdump system */
648 memblock_remove(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX);
653 * Reserve memory for kdump kernel to be loaded with kexec
655 static void __init reserve_crashkernel(void)
657 #ifdef CONFIG_CRASH_DUMP
658 unsigned long long crash_base, crash_size;
659 phys_addr_t low, high;
662 rc = parse_crashkernel(boot_command_line, memory_end, &crash_size,
665 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
666 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
667 if (rc || crash_size == 0)
670 if (memblock.memory.regions[0].size < crash_size) {
671 pr_info("crashkernel reservation failed: %s\n",
672 "first memory chunk must be at least crashkernel size");
676 low = crash_base ?: OLDMEM_BASE;
677 high = low + crash_size;
678 if (low >= OLDMEM_BASE && high <= OLDMEM_BASE + OLDMEM_SIZE) {
679 /* The crashkernel fits into OLDMEM, reuse OLDMEM */
682 /* Find suitable area in free memory */
683 low = max_t(unsigned long, crash_size, sclp.hsa_size);
684 high = crash_base ? crash_base + crash_size : ULONG_MAX;
686 if (crash_base && crash_base < low) {
687 pr_info("crashkernel reservation failed: %s\n",
688 "crash_base too low");
691 low = crash_base ?: low;
692 crash_base = memblock_find_in_range(low, high, crash_size,
693 KEXEC_CRASH_MEM_ALIGN);
697 pr_info("crashkernel reservation failed: %s\n",
698 "no suitable area found");
702 if (register_memory_notifier(&kdump_mem_nb))
705 if (!OLDMEM_BASE && MACHINE_IS_VM)
706 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
707 crashk_res.start = crash_base;
708 crashk_res.end = crash_base + crash_size - 1;
709 memblock_remove(crash_base, crash_size);
710 pr_info("Reserving %lluMB of memory at %lluMB "
711 "for crashkernel (System RAM: %luMB)\n",
712 crash_size >> 20, crash_base >> 20,
713 (unsigned long)memblock.memory.total_size >> 20);
714 os_info_crashkernel_add(crash_base, crash_size);
719 * Reserve the initrd from being used by memblock
721 static void __init reserve_initrd(void)
723 #ifdef CONFIG_BLK_DEV_INITRD
724 if (!INITRD_START || !INITRD_SIZE)
726 initrd_start = INITRD_START;
727 initrd_end = initrd_start + INITRD_SIZE;
728 memblock_reserve(INITRD_START, INITRD_SIZE);
733 * Reserve the memory area used to pass the certificate lists
735 static void __init reserve_certificate_list(void)
737 if (ipl_cert_list_addr)
738 memblock_reserve(ipl_cert_list_addr, ipl_cert_list_size);
741 static void __init reserve_mem_detect_info(void)
743 unsigned long start, size;
745 get_mem_detect_reserved(&start, &size);
747 memblock_reserve(start, size);
750 static void __init free_mem_detect_info(void)
752 unsigned long start, size;
754 get_mem_detect_reserved(&start, &size);
756 memblock_free(start, size);
759 static const char * __init get_mem_info_source(void)
761 switch (mem_detect.info_source) {
762 case MEM_DETECT_SCLP_STOR_INFO:
763 return "sclp storage info";
764 case MEM_DETECT_DIAG260:
766 case MEM_DETECT_SCLP_READ_INFO:
767 return "sclp read info";
768 case MEM_DETECT_BIN_SEARCH:
769 return "binary search";
774 static void __init memblock_add_mem_detect_info(void)
776 unsigned long start, end;
779 memblock_dbg("physmem info source: %s (%hhd)\n",
780 get_mem_info_source(), mem_detect.info_source);
781 /* keep memblock lists close to the kernel */
782 memblock_set_bottom_up(true);
783 for_each_mem_detect_block(i, &start, &end) {
784 memblock_add(start, end - start);
785 memblock_physmem_add(start, end - start);
787 memblock_set_bottom_up(false);
788 memblock_set_node(0, ULONG_MAX, &memblock.memory, 0);
793 * Check for initrd being in usable memory
795 static void __init check_initrd(void)
797 #ifdef CONFIG_BLK_DEV_INITRD
798 if (INITRD_START && INITRD_SIZE &&
799 !memblock_is_region_memory(INITRD_START, INITRD_SIZE)) {
800 pr_err("The initial RAM disk does not fit into the memory\n");
801 memblock_free(INITRD_START, INITRD_SIZE);
802 initrd_start = initrd_end = 0;
808 * Reserve memory used for lowcore/command line/kernel image.
810 static void __init reserve_kernel(void)
812 unsigned long start_pfn = PFN_UP(__pa(_end));
814 memblock_reserve(0, HEAD_END);
815 memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn)
816 - (unsigned long)_stext);
817 memblock_reserve(__sdma, __edma - __sdma);
820 static void __init setup_memory(void)
822 struct memblock_region *reg;
825 * Init storage key for present memory
827 for_each_memblock(memory, reg) {
828 storage_key_init_range(reg->base, reg->base + reg->size);
830 psw_set_key(PAGE_DEFAULT_KEY);
833 memblock_enforce_memory_limit(memblock_end_of_DRAM());
837 * Setup hardware capabilities.
839 static int __init setup_hwcaps(void)
841 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
846 * The store facility list bits numbers as found in the principles
847 * of operation are numbered with bit 1UL<<31 as number 0 to
848 * bit 1UL<<0 as number 31.
849 * Bit 0: instructions named N3, "backported" to esa-mode
850 * Bit 2: z/Architecture mode is active
851 * Bit 7: the store-facility-list-extended facility is installed
852 * Bit 17: the message-security assist is installed
853 * Bit 19: the long-displacement facility is installed
854 * Bit 21: the extended-immediate facility is installed
855 * Bit 22: extended-translation facility 3 is installed
856 * Bit 30: extended-translation facility 3 enhancement facility
857 * These get translated to:
858 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
859 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
860 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
861 * HWCAP_S390_ETF3EH bit 8 (22 && 30).
863 for (i = 0; i < 6; i++)
864 if (test_facility(stfl_bits[i]))
865 elf_hwcap |= 1UL << i;
867 if (test_facility(22) && test_facility(30))
868 elf_hwcap |= HWCAP_S390_ETF3EH;
871 * Check for additional facilities with store-facility-list-extended.
872 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
873 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
874 * as stored by stfl, bits 32-xxx contain additional facilities.
875 * How many facility words are stored depends on the number of
876 * doublewords passed to the instruction. The additional facilities
878 * Bit 42: decimal floating point facility is installed
879 * Bit 44: perform floating point operation facility is installed
881 * HWCAP_S390_DFP bit 6 (42 && 44).
883 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
884 elf_hwcap |= HWCAP_S390_DFP;
887 * Huge page support HWCAP_S390_HPAGE is bit 7.
889 if (MACHINE_HAS_EDAT1)
890 elf_hwcap |= HWCAP_S390_HPAGE;
893 * 64-bit register support for 31-bit processes
894 * HWCAP_S390_HIGH_GPRS is bit 9.
896 elf_hwcap |= HWCAP_S390_HIGH_GPRS;
899 * Transactional execution support HWCAP_S390_TE is bit 10.
902 elf_hwcap |= HWCAP_S390_TE;
905 * Vector extension HWCAP_S390_VXRS is bit 11. The Vector extension
906 * can be disabled with the "novx" parameter. Use MACHINE_HAS_VX
907 * instead of facility bit 129.
909 if (MACHINE_HAS_VX) {
910 elf_hwcap |= HWCAP_S390_VXRS;
911 if (test_facility(134))
912 elf_hwcap |= HWCAP_S390_VXRS_EXT;
913 if (test_facility(135))
914 elf_hwcap |= HWCAP_S390_VXRS_BCD;
915 if (test_facility(148))
916 elf_hwcap |= HWCAP_S390_VXRS_EXT2;
917 if (test_facility(152))
918 elf_hwcap |= HWCAP_S390_VXRS_PDE;
920 if (test_facility(150))
921 elf_hwcap |= HWCAP_S390_SORT;
922 if (test_facility(151))
923 elf_hwcap |= HWCAP_S390_DFLT;
926 * Guarded storage support HWCAP_S390_GS is bit 12.
929 elf_hwcap |= HWCAP_S390_GS;
932 add_device_randomness(&cpu_id, sizeof(cpu_id));
933 switch (cpu_id.machine) {
936 default: /* Use "z900" as default for 64 bit kernels. */
937 strcpy(elf_platform, "z900");
941 strcpy(elf_platform, "z990");
945 strcpy(elf_platform, "z9-109");
949 strcpy(elf_platform, "z10");
953 strcpy(elf_platform, "z196");
957 strcpy(elf_platform, "zEC12");
961 strcpy(elf_platform, "z13");
965 strcpy(elf_platform, "z14");
969 strcpy(elf_platform, "z15");
974 * Virtualization support HWCAP_INT_SIE is bit 0.
977 int_hwcap |= HWCAP_INT_SIE;
981 arch_initcall(setup_hwcaps);
984 * Add system information as device randomness
986 static void __init setup_randomness(void)
988 struct sysinfo_3_2_2 *vmms;
990 vmms = (struct sysinfo_3_2_2 *) memblock_phys_alloc(PAGE_SIZE,
993 panic("Failed to allocate memory for sysinfo structure\n");
995 if (stsi(vmms, 3, 2, 2) == 0 && vmms->count)
996 add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count);
997 memblock_free((unsigned long) vmms, PAGE_SIZE);
1001 * Find the correct size for the task_struct. This depends on
1002 * the size of the struct fpu at the end of the thread_struct
1003 * which is embedded in the task_struct.
1005 static void __init setup_task_size(void)
1007 int task_size = sizeof(struct task_struct);
1009 if (!MACHINE_HAS_VX) {
1010 task_size -= sizeof(__vector128) * __NUM_VXRS;
1011 task_size += sizeof(freg_t) * __NUM_FPRS;
1013 arch_task_struct_size = task_size;
1017 * Issue diagnose 318 to set the control program name and
1020 static void __init setup_control_program_code(void)
1022 union diag318_info diag318_info = {
1027 if (!sclp.has_diag318)
1030 diag_stat_inc(DIAG_STAT_X318);
1031 asm volatile("diag %0,0,0x318\n" : : "d" (diag318_info.val));
1035 * Print the component list from the IPL report
1037 static void __init log_component_list(void)
1039 struct ipl_rb_component_entry *ptr, *end;
1042 if (!early_ipl_comp_list_addr)
1044 if (ipl_block.hdr.flags & IPL_PL_FLAG_SIPL)
1045 pr_info("Linux is running with Secure-IPL enabled\n");
1047 pr_info("Linux is running with Secure-IPL disabled\n");
1048 ptr = (void *) early_ipl_comp_list_addr;
1049 end = (void *) ptr + early_ipl_comp_list_size;
1050 pr_info("The IPL report contains the following components:\n");
1052 if (ptr->flags & IPL_RB_COMPONENT_FLAG_SIGNED) {
1053 if (ptr->flags & IPL_RB_COMPONENT_FLAG_VERIFIED)
1054 str = "signed, verified";
1056 str = "signed, verification failed";
1060 pr_info("%016llx - %016llx (%s)\n",
1061 ptr->addr, ptr->addr + ptr->len, str);
1067 * Setup function called from init/main.c just after the banner
1071 void __init setup_arch(char **cmdline_p)
1074 * print what head.S has found out about the machine
1077 pr_info("Linux is running as a z/VM "
1078 "guest operating system in 64-bit mode\n");
1079 else if (MACHINE_IS_KVM)
1080 pr_info("Linux is running under KVM in 64-bit mode\n");
1081 else if (MACHINE_IS_LPAR)
1082 pr_info("Linux is running natively in 64-bit mode\n");
1084 pr_info("Linux is running as a guest in 64-bit mode\n");
1086 log_component_list();
1088 /* Have one command line that is parsed and saved in /proc/cmdline */
1089 /* boot_command_line has been already set up in early.c */
1090 *cmdline_p = boot_command_line;
1092 ROOT_DEV = Root_RAM0;
1094 init_mm.start_code = (unsigned long) _text;
1095 init_mm.end_code = (unsigned long) _etext;
1096 init_mm.end_data = (unsigned long) _edata;
1097 init_mm.brk = (unsigned long) _end;
1099 if (IS_ENABLED(CONFIG_EXPOLINE_AUTO))
1100 nospec_auto_detect();
1103 parse_early_param();
1104 #ifdef CONFIG_CRASH_DUMP
1105 /* Deactivate elfcorehdr= kernel parameter */
1106 elfcorehdr_addr = ELFCORE_ADDR_MAX;
1112 setup_control_program_code();
1114 /* Do some memory reservations *before* memory is added to memblock */
1115 reserve_memory_end();
1119 reserve_certificate_list();
1120 reserve_mem_detect_info();
1121 memblock_allow_resize();
1123 /* Get information about *all* installed memory */
1124 memblock_add_mem_detect_info();
1126 free_mem_detect_info();
1129 if (is_prot_virt_host())
1133 dma_contiguous_reserve(memory_end);
1137 reserve_crashkernel();
1138 #ifdef CONFIG_CRASH_DUMP
1140 * Be aware that smp_save_dump_cpus() triggers a system reset.
1141 * Therefore CPU and device initialization should be done afterwards.
1143 smp_save_dump_cpus();
1147 setup_lowcore_dat_off();
1148 smp_fill_possible_mask();
1149 cpu_detect_mhz_feature();
1153 topology_init_early();
1156 * Create kernel page tables and switch to virtual addressing.
1161 * After paging_init created the kernel page table, the new PSWs
1162 * in lowcore can now run with DAT enabled.
1164 setup_lowcore_dat_on();
1166 /* Setup default console */
1168 set_preferred_console();
1170 apply_alternative_instructions();
1171 if (IS_ENABLED(CONFIG_EXPOLINE))
1172 nospec_init_branches();
1174 /* Setup zfcpdump support */
1177 /* Add system specific data to the random pool */