3 * Copyright IBM Corp. 1999, 2012
4 * Author(s): Hartmut Penner (hp@de.ibm.com),
5 * Martin Schwidefsky (schwidefsky@de.ibm.com)
7 * Derived from "arch/i386/kernel/setup.c"
8 * Copyright (C) 1995, Linus Torvalds
12 * This file handles the architecture-dependent parts of initialization
15 #define KMSG_COMPONENT "setup"
16 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
18 #include <linux/errno.h>
19 #include <linux/export.h>
20 #include <linux/sched.h>
21 #include <linux/kernel.h>
22 #include <linux/memblock.h>
24 #include <linux/stddef.h>
25 #include <linux/unistd.h>
26 #include <linux/ptrace.h>
27 #include <linux/user.h>
28 #include <linux/tty.h>
29 #include <linux/ioport.h>
30 #include <linux/delay.h>
31 #include <linux/init.h>
32 #include <linux/initrd.h>
33 #include <linux/bootmem.h>
34 #include <linux/root_dev.h>
35 #include <linux/console.h>
36 #include <linux/kernel_stat.h>
37 #include <linux/device.h>
38 #include <linux/notifier.h>
39 #include <linux/pfn.h>
40 #include <linux/ctype.h>
41 #include <linux/reboot.h>
42 #include <linux/topology.h>
43 #include <linux/ftrace.h>
44 #include <linux/kexec.h>
45 #include <linux/crash_dump.h>
46 #include <linux/memory.h>
47 #include <linux/compat.h>
50 #include <asm/facility.h>
52 #include <asm/mmu_context.h>
53 #include <asm/cpcmd.h>
54 #include <asm/lowcore.h>
57 #include <asm/ptrace.h>
58 #include <asm/sections.h>
59 #include <asm/ebcdic.h>
60 #include <asm/kvm_virtio.h>
62 #include <asm/os_info.h>
69 unsigned int console_mode = 0;
70 EXPORT_SYMBOL(console_mode);
72 unsigned int console_devno = -1;
73 EXPORT_SYMBOL(console_devno);
75 unsigned int console_irq = -1;
76 EXPORT_SYMBOL(console_irq);
78 unsigned long elf_hwcap = 0;
79 char elf_platform[ELF_PLATFORM_SIZE];
81 struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS];
83 int __initdata memory_end_set;
84 unsigned long __initdata memory_end;
86 unsigned long VMALLOC_START;
87 EXPORT_SYMBOL(VMALLOC_START);
89 unsigned long VMALLOC_END;
90 EXPORT_SYMBOL(VMALLOC_END);
93 EXPORT_SYMBOL(vmemmap);
96 unsigned long MODULES_VADDR;
97 unsigned long MODULES_END;
100 /* An array with a pointer to the lowcore of every CPU. */
101 struct _lowcore *lowcore_ptr[NR_CPUS];
102 EXPORT_SYMBOL(lowcore_ptr);
105 * This is set up by the setup-routine at boot-time
106 * for S390 need to find out, what we have to setup
107 * using address 0x10400 ...
110 #include <asm/setup.h>
113 * condev= and conmode= setup parameter.
116 static int __init condev_setup(char *str)
120 vdev = simple_strtoul(str, &str, 0);
121 if (vdev >= 0 && vdev < 65536) {
122 console_devno = vdev;
128 __setup("condev=", condev_setup);
130 static void __init set_preferred_console(void)
132 if (MACHINE_IS_KVM) {
133 if (sclp_has_vt220())
134 add_preferred_console("ttyS", 1, NULL);
135 else if (sclp_has_linemode())
136 add_preferred_console("ttyS", 0, NULL);
138 add_preferred_console("hvc", 0, NULL);
139 } else if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
140 add_preferred_console("ttyS", 0, NULL);
141 else if (CONSOLE_IS_3270)
142 add_preferred_console("tty3270", 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)
209 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
215 #ifdef CONFIG_ZFCPDUMP
216 static void __init setup_zfcpdump(void)
218 if (ipl_info.type != IPL_TYPE_FCP_DUMP)
222 strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev");
223 console_loglevel = 2;
226 static inline void setup_zfcpdump(void) {}
227 #endif /* CONFIG_ZFCPDUMP */
230 * Reboot, halt and power_off stubs. They just call _machine_restart,
231 * _machine_halt or _machine_power_off.
234 void machine_restart(char *command)
236 if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
238 * Only unblank the console if we are called in enabled
239 * context or a bust_spinlocks cleared the way for us.
242 _machine_restart(command);
245 void machine_halt(void)
247 if (!in_interrupt() || oops_in_progress)
249 * Only unblank the console if we are called in enabled
250 * context or a bust_spinlocks cleared the way for us.
256 void machine_power_off(void)
258 if (!in_interrupt() || oops_in_progress)
260 * Only unblank the console if we are called in enabled
261 * context or a bust_spinlocks cleared the way for us.
264 _machine_power_off();
268 * Dummy power off function.
270 void (*pm_power_off)(void) = machine_power_off;
271 EXPORT_SYMBOL_GPL(pm_power_off);
273 static int __init early_parse_mem(char *p)
275 memory_end = memparse(p, &p);
279 early_param("mem", early_parse_mem);
281 static int __init parse_vmalloc(char *arg)
285 VMALLOC_END = (memparse(arg, &arg) + PAGE_SIZE - 1) & PAGE_MASK;
288 early_param("vmalloc", parse_vmalloc);
290 void *restart_stack __attribute__((__section__(".data")));
292 static void __init setup_lowcore(void)
297 * Setup lowcore for boot cpu
299 BUILD_BUG_ON(sizeof(struct _lowcore) != LC_PAGES * 4096);
300 lc = __alloc_bootmem_low(LC_PAGES * PAGE_SIZE, LC_PAGES * PAGE_SIZE, 0);
301 lc->restart_psw.mask = PSW_KERNEL_BITS;
302 lc->restart_psw.addr =
303 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
304 lc->external_new_psw.mask = PSW_KERNEL_BITS |
305 PSW_MASK_DAT | PSW_MASK_MCHECK;
306 lc->external_new_psw.addr =
307 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
308 lc->svc_new_psw.mask = PSW_KERNEL_BITS |
309 PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
310 lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
311 lc->program_new_psw.mask = PSW_KERNEL_BITS |
312 PSW_MASK_DAT | PSW_MASK_MCHECK;
313 lc->program_new_psw.addr =
314 PSW_ADDR_AMODE | (unsigned long) pgm_check_handler;
315 lc->mcck_new_psw.mask = PSW_KERNEL_BITS;
316 lc->mcck_new_psw.addr =
317 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
318 lc->io_new_psw.mask = PSW_KERNEL_BITS |
319 PSW_MASK_DAT | PSW_MASK_MCHECK;
320 lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
321 lc->clock_comparator = -1ULL;
322 lc->kernel_stack = ((unsigned long) &init_thread_union)
323 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
324 lc->async_stack = (unsigned long)
325 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0)
326 + ASYNC_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
327 lc->panic_stack = (unsigned long)
328 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0)
329 + PAGE_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
330 lc->current_task = (unsigned long) init_thread_union.thread_info.task;
331 lc->thread_info = (unsigned long) &init_thread_union;
332 lc->machine_flags = S390_lowcore.machine_flags;
333 lc->stfl_fac_list = S390_lowcore.stfl_fac_list;
334 memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
337 if (MACHINE_HAS_IEEE) {
338 lc->extended_save_area_addr = (__u32)
339 __alloc_bootmem_low(PAGE_SIZE, PAGE_SIZE, 0);
340 /* enable extended save area */
341 __ctl_set_bit(14, 29);
344 lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0];
346 lc->sync_enter_timer = S390_lowcore.sync_enter_timer;
347 lc->async_enter_timer = S390_lowcore.async_enter_timer;
348 lc->exit_timer = S390_lowcore.exit_timer;
349 lc->user_timer = S390_lowcore.user_timer;
350 lc->system_timer = S390_lowcore.system_timer;
351 lc->steal_timer = S390_lowcore.steal_timer;
352 lc->last_update_timer = S390_lowcore.last_update_timer;
353 lc->last_update_clock = S390_lowcore.last_update_clock;
354 lc->ftrace_func = S390_lowcore.ftrace_func;
356 restart_stack = __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0);
357 restart_stack += ASYNC_SIZE;
360 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant
361 * restart data to the absolute zero lowcore. This is necessary if
362 * PSW restart is done on an offline CPU that has lowcore zero.
364 lc->restart_stack = (unsigned long) restart_stack;
365 lc->restart_fn = (unsigned long) do_restart;
366 lc->restart_data = 0;
367 lc->restart_source = -1UL;
369 /* Setup absolute zero lowcore */
370 mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack);
371 mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn);
372 mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data);
373 mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source);
374 mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw);
376 set_prefix((u32)(unsigned long) lc);
380 static struct resource code_resource = {
381 .name = "Kernel code",
382 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
385 static struct resource data_resource = {
386 .name = "Kernel data",
387 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
390 static struct resource bss_resource = {
391 .name = "Kernel bss",
392 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
395 static struct resource __initdata *standard_resources[] = {
401 static void __init setup_resources(void)
403 struct resource *res, *std_res, *sub_res;
406 code_resource.start = (unsigned long) &_text;
407 code_resource.end = (unsigned long) &_etext - 1;
408 data_resource.start = (unsigned long) &_etext;
409 data_resource.end = (unsigned long) &_edata - 1;
410 bss_resource.start = (unsigned long) &__bss_start;
411 bss_resource.end = (unsigned long) &__bss_stop - 1;
413 for (i = 0; i < MEMORY_CHUNKS; i++) {
414 if (!memory_chunk[i].size)
416 res = alloc_bootmem_low(sizeof(*res));
417 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
418 switch (memory_chunk[i].type) {
419 case CHUNK_READ_WRITE:
420 res->name = "System RAM";
422 case CHUNK_READ_ONLY:
423 res->name = "System ROM";
424 res->flags |= IORESOURCE_READONLY;
427 res->name = "reserved";
429 res->start = memory_chunk[i].addr;
430 res->end = res->start + memory_chunk[i].size - 1;
431 request_resource(&iomem_resource, res);
433 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
434 std_res = standard_resources[j];
435 if (std_res->start < res->start ||
436 std_res->start > res->end)
438 if (std_res->end > res->end) {
439 sub_res = alloc_bootmem_low(sizeof(*sub_res));
441 sub_res->end = res->end;
442 std_res->start = res->end + 1;
443 request_resource(res, sub_res);
445 request_resource(res, std_res);
451 static void __init setup_memory_end(void)
453 unsigned long vmax, vmalloc_size, tmp;
454 unsigned long real_memory_size = 0;
458 #ifdef CONFIG_ZFCPDUMP
459 if (ipl_info.type == IPL_TYPE_FCP_DUMP &&
460 !OLDMEM_BASE && sclp_get_hsa_size()) {
461 memory_end = sclp_get_hsa_size();
465 memory_end &= PAGE_MASK;
468 * Make sure all chunks are MAX_ORDER aligned so we don't need the
469 * extra checks that HOLES_IN_ZONE would require.
471 for (i = 0; i < MEMORY_CHUNKS; i++) {
472 unsigned long start, end;
473 struct mem_chunk *chunk;
476 chunk = &memory_chunk[i];
479 align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1);
480 start = (chunk->addr + align - 1) & ~(align - 1);
481 end = (chunk->addr + chunk->size) & ~(align - 1);
483 memset(chunk, 0, sizeof(*chunk));
486 chunk->size = end - start;
488 real_memory_size = max(real_memory_size,
489 chunk->addr + chunk->size);
492 /* Choose kernel address space layout: 2, 3, or 4 levels. */
494 vmalloc_size = VMALLOC_END ?: (128UL << 30) - MODULES_LEN;
495 tmp = (memory_end ?: real_memory_size) / PAGE_SIZE;
496 tmp = tmp * (sizeof(struct page) + PAGE_SIZE) + vmalloc_size;
497 if (tmp <= (1UL << 42))
498 vmax = 1UL << 42; /* 3-level kernel page table */
500 vmax = 1UL << 53; /* 4-level kernel page table */
501 /* module area is at the end of the kernel address space. */
503 MODULES_VADDR = MODULES_END - MODULES_LEN;
504 VMALLOC_END = MODULES_VADDR;
506 vmalloc_size = VMALLOC_END ?: 96UL << 20;
507 vmax = 1UL << 31; /* 2-level kernel page table */
508 /* vmalloc area is at the end of the kernel address space. */
511 VMALLOC_START = vmax - vmalloc_size;
513 /* Split remaining virtual space between 1:1 mapping & vmemmap array */
514 tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page));
515 /* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */
516 tmp = SECTION_ALIGN_UP(tmp);
517 tmp = VMALLOC_START - tmp * sizeof(struct page);
518 tmp &= ~((vmax >> 11) - 1); /* align to page table level */
519 tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS);
520 vmemmap = (struct page *) tmp;
522 /* Take care that memory_end is set and <= vmemmap */
523 memory_end = min(memory_end ?: real_memory_size, tmp);
525 /* Fixup memory chunk array to fit into 0..memory_end */
526 for (i = 0; i < MEMORY_CHUNKS; i++) {
527 struct mem_chunk *chunk = &memory_chunk[i];
531 if (chunk->addr >= memory_end) {
532 memset(chunk, 0, sizeof(*chunk));
535 if (chunk->addr + chunk->size > memory_end)
536 chunk->size = memory_end - chunk->addr;
540 static void __init setup_vmcoreinfo(void)
542 mem_assign_absolute(S390_lowcore.vmcore_info, paddr_vmcoreinfo_note());
545 #ifdef CONFIG_CRASH_DUMP
548 * Find suitable location for crashkernel memory
550 static unsigned long __init find_crash_base(unsigned long crash_size,
553 unsigned long crash_base;
554 struct mem_chunk *chunk;
557 if (memory_chunk[0].size < crash_size) {
558 *msg = "first memory chunk must be at least crashkernel size";
561 if (OLDMEM_BASE && crash_size == OLDMEM_SIZE)
564 for (i = MEMORY_CHUNKS - 1; i >= 0; i--) {
565 chunk = &memory_chunk[i];
566 if (chunk->size == 0)
568 if (chunk->type != CHUNK_READ_WRITE)
570 if (chunk->size < crash_size)
572 crash_base = (chunk->addr + chunk->size) - crash_size;
573 if (crash_base < crash_size)
575 if (crash_base < sclp_get_hsa_size())
577 if (crash_base < (unsigned long) INITRD_START + INITRD_SIZE)
581 *msg = "no suitable area found";
586 * Check if crash_base and crash_size is valid
588 static int __init verify_crash_base(unsigned long crash_base,
589 unsigned long crash_size,
592 struct mem_chunk *chunk;
596 * Because we do the swap to zero, we must have at least 'crash_size'
597 * bytes free space before crash_base
599 if (crash_size > crash_base) {
600 *msg = "crashkernel offset must be greater than size";
604 /* First memory chunk must be at least crash_size */
605 if (memory_chunk[0].size < crash_size) {
606 *msg = "first memory chunk must be at least crashkernel size";
609 /* Check if we fit into the respective memory chunk */
610 for (i = 0; i < MEMORY_CHUNKS; i++) {
611 chunk = &memory_chunk[i];
612 if (chunk->size == 0)
614 if (crash_base < chunk->addr)
616 if (crash_base >= chunk->addr + chunk->size)
618 /* we have found the memory chunk */
619 if (crash_base + crash_size > chunk->addr + chunk->size) {
620 *msg = "selected memory chunk is too small for "
621 "crashkernel memory";
626 *msg = "invalid memory range specified";
631 * When kdump is enabled, we have to ensure that no memory from
632 * the area [0 - crashkernel memory size] and
633 * [crashk_res.start - crashk_res.end] is set offline.
635 static int kdump_mem_notifier(struct notifier_block *nb,
636 unsigned long action, void *data)
638 struct memory_notify *arg = data;
640 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
642 if (arg->start_pfn > PFN_DOWN(crashk_res.end))
644 if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start))
649 static struct notifier_block kdump_mem_nb = {
650 .notifier_call = kdump_mem_notifier,
656 * Make sure that oldmem, where the dump is stored, is protected
658 static void reserve_oldmem(void)
660 #ifdef CONFIG_CRASH_DUMP
661 unsigned long real_size = 0;
666 for (i = 0; i < MEMORY_CHUNKS; i++) {
667 struct mem_chunk *chunk = &memory_chunk[i];
669 real_size = max(real_size, chunk->addr + chunk->size);
671 create_mem_hole(memory_chunk, OLDMEM_BASE, OLDMEM_SIZE);
672 create_mem_hole(memory_chunk, OLDMEM_SIZE, real_size - OLDMEM_SIZE);
677 * Reserve memory for kdump kernel to be loaded with kexec
679 static void __init reserve_crashkernel(void)
681 #ifdef CONFIG_CRASH_DUMP
682 unsigned long long crash_base, crash_size;
686 rc = parse_crashkernel(boot_command_line, memory_end, &crash_size,
688 if (rc || crash_size == 0)
690 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
691 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
692 if (register_memory_notifier(&kdump_mem_nb))
695 crash_base = find_crash_base(crash_size, &msg);
697 pr_info("crashkernel reservation failed: %s\n", msg);
698 unregister_memory_notifier(&kdump_mem_nb);
701 if (verify_crash_base(crash_base, crash_size, &msg)) {
702 pr_info("crashkernel reservation failed: %s\n", msg);
703 unregister_memory_notifier(&kdump_mem_nb);
706 if (!OLDMEM_BASE && MACHINE_IS_VM)
707 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
708 crashk_res.start = crash_base;
709 crashk_res.end = crash_base + crash_size - 1;
710 insert_resource(&iomem_resource, &crashk_res);
711 create_mem_hole(memory_chunk, crash_base, crash_size);
712 pr_info("Reserving %lluMB of memory at %lluMB "
713 "for crashkernel (System RAM: %luMB)\n",
714 crash_size >> 20, crash_base >> 20, memory_end >> 20);
715 os_info_crashkernel_add(crash_base, crash_size);
719 static void __init setup_memory(void)
721 unsigned long bootmap_size;
722 unsigned long start_pfn, end_pfn;
726 * partially used pages are not usable - thus
727 * we are rounding upwards:
729 start_pfn = PFN_UP(__pa(&_end));
730 end_pfn = max_pfn = PFN_DOWN(memory_end);
732 #ifdef CONFIG_BLK_DEV_INITRD
734 * Move the initrd in case the bitmap of the bootmem allocater
735 * would overwrite it.
738 if (INITRD_START && INITRD_SIZE) {
739 unsigned long bmap_size;
742 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
743 bmap_size = PFN_PHYS(bmap_size);
745 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
746 start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
748 #ifdef CONFIG_CRASH_DUMP
750 /* Move initrd behind kdump oldmem */
751 if (start + INITRD_SIZE > OLDMEM_BASE &&
752 start < OLDMEM_BASE + OLDMEM_SIZE)
753 start = OLDMEM_BASE + OLDMEM_SIZE;
756 if (start + INITRD_SIZE > memory_end) {
757 pr_err("initrd extends beyond end of "
758 "memory (0x%08lx > 0x%08lx) "
759 "disabling initrd\n",
760 start + INITRD_SIZE, memory_end);
761 INITRD_START = INITRD_SIZE = 0;
763 pr_info("Moving initrd (0x%08lx -> "
764 "0x%08lx, size: %ld)\n",
765 INITRD_START, start, INITRD_SIZE);
766 memmove((void *) start, (void *) INITRD_START,
768 INITRD_START = start;
775 * Initialize the boot-time allocator
777 bootmap_size = init_bootmem(start_pfn, end_pfn);
780 * Register RAM areas with the bootmem allocator.
783 for (i = 0; i < MEMORY_CHUNKS; i++) {
784 unsigned long start_chunk, end_chunk, pfn;
786 if (!memory_chunk[i].size)
788 start_chunk = PFN_DOWN(memory_chunk[i].addr);
789 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size);
790 end_chunk = min(end_chunk, end_pfn);
791 if (start_chunk >= end_chunk)
793 memblock_add_node(PFN_PHYS(start_chunk),
794 PFN_PHYS(end_chunk - start_chunk), 0);
795 pfn = max(start_chunk, start_pfn);
796 storage_key_init_range(PFN_PHYS(pfn), PFN_PHYS(end_chunk));
799 psw_set_key(PAGE_DEFAULT_KEY);
801 free_bootmem_with_active_regions(0, max_pfn);
804 * Reserve memory used for lowcore/command line/kernel image.
806 reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT);
807 reserve_bootmem((unsigned long)_stext,
808 PFN_PHYS(start_pfn) - (unsigned long)_stext,
811 * Reserve the bootmem bitmap itself as well. We do this in two
812 * steps (first step was init_bootmem()) because this catches
813 * the (very unlikely) case of us accidentally initializing the
814 * bootmem allocator with an invalid RAM area.
816 reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size,
819 #ifdef CONFIG_CRASH_DUMP
820 if (crashk_res.start)
821 reserve_bootmem(crashk_res.start,
822 crashk_res.end - crashk_res.start + 1,
824 if (is_kdump_kernel())
825 reserve_bootmem(elfcorehdr_addr - OLDMEM_BASE,
826 PAGE_ALIGN(elfcorehdr_size), BOOTMEM_DEFAULT);
828 #ifdef CONFIG_BLK_DEV_INITRD
829 if (INITRD_START && INITRD_SIZE) {
830 if (INITRD_START + INITRD_SIZE <= memory_end) {
831 reserve_bootmem(INITRD_START, INITRD_SIZE,
833 initrd_start = INITRD_START;
834 initrd_end = initrd_start + INITRD_SIZE;
836 pr_err("initrd extends beyond end of "
837 "memory (0x%08lx > 0x%08lx) "
838 "disabling initrd\n",
839 initrd_start + INITRD_SIZE, memory_end);
840 initrd_start = initrd_end = 0;
847 * Setup hardware capabilities.
849 static void __init setup_hwcaps(void)
851 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
856 * The store facility list bits numbers as found in the principles
857 * of operation are numbered with bit 1UL<<31 as number 0 to
858 * bit 1UL<<0 as number 31.
859 * Bit 0: instructions named N3, "backported" to esa-mode
860 * Bit 2: z/Architecture mode is active
861 * Bit 7: the store-facility-list-extended facility is installed
862 * Bit 17: the message-security assist is installed
863 * Bit 19: the long-displacement facility is installed
864 * Bit 21: the extended-immediate facility is installed
865 * Bit 22: extended-translation facility 3 is installed
866 * Bit 30: extended-translation facility 3 enhancement facility
867 * These get translated to:
868 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
869 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
870 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
871 * HWCAP_S390_ETF3EH bit 8 (22 && 30).
873 for (i = 0; i < 6; i++)
874 if (test_facility(stfl_bits[i]))
875 elf_hwcap |= 1UL << i;
877 if (test_facility(22) && test_facility(30))
878 elf_hwcap |= HWCAP_S390_ETF3EH;
881 * Check for additional facilities with store-facility-list-extended.
882 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
883 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
884 * as stored by stfl, bits 32-xxx contain additional facilities.
885 * How many facility words are stored depends on the number of
886 * doublewords passed to the instruction. The additional facilities
888 * Bit 42: decimal floating point facility is installed
889 * Bit 44: perform floating point operation facility is installed
891 * HWCAP_S390_DFP bit 6 (42 && 44).
893 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
894 elf_hwcap |= HWCAP_S390_DFP;
897 * Huge page support HWCAP_S390_HPAGE is bit 7.
899 if (MACHINE_HAS_HPAGE)
900 elf_hwcap |= HWCAP_S390_HPAGE;
902 #if defined(CONFIG_64BIT)
904 * 64-bit register support for 31-bit processes
905 * HWCAP_S390_HIGH_GPRS is bit 9.
907 elf_hwcap |= HWCAP_S390_HIGH_GPRS;
910 * Transactional execution support HWCAP_S390_TE is bit 10.
912 if (test_facility(50) && test_facility(73))
913 elf_hwcap |= HWCAP_S390_TE;
917 switch (cpu_id.machine) {
919 #if !defined(CONFIG_64BIT)
920 default: /* Use "g5" as default for 31 bit kernels. */
922 strcpy(elf_platform, "g5");
926 #if defined(CONFIG_64BIT)
927 default: /* Use "z900" as default for 64 bit kernels. */
929 strcpy(elf_platform, "z900");
933 strcpy(elf_platform, "z990");
937 strcpy(elf_platform, "z9-109");
941 strcpy(elf_platform, "z10");
945 strcpy(elf_platform, "z196");
949 strcpy(elf_platform, "zEC12");
955 * Setup function called from init/main.c just after the banner
959 void __init setup_arch(char **cmdline_p)
962 * print what head.S has found out about the machine
966 pr_info("Linux is running as a z/VM "
967 "guest operating system in 31-bit mode\n");
968 else if (MACHINE_IS_LPAR)
969 pr_info("Linux is running natively in 31-bit mode\n");
970 if (MACHINE_HAS_IEEE)
971 pr_info("The hardware system has IEEE compatible "
972 "floating point units\n");
974 pr_info("The hardware system has no IEEE compatible "
975 "floating point units\n");
976 #else /* CONFIG_64BIT */
978 pr_info("Linux is running as a z/VM "
979 "guest operating system in 64-bit mode\n");
980 else if (MACHINE_IS_KVM)
981 pr_info("Linux is running under KVM in 64-bit mode\n");
982 else if (MACHINE_IS_LPAR)
983 pr_info("Linux is running natively in 64-bit mode\n");
984 #endif /* CONFIG_64BIT */
986 /* Have one command line that is parsed and saved in /proc/cmdline */
987 /* boot_command_line has been already set up in early.c */
988 *cmdline_p = boot_command_line;
990 ROOT_DEV = Root_RAM0;
992 init_mm.start_code = PAGE_OFFSET;
993 init_mm.end_code = (unsigned long) &_etext;
994 init_mm.end_data = (unsigned long) &_edata;
995 init_mm.brk = (unsigned long) &_end;
998 detect_memory_layout(memory_chunk, memory_end);
1003 reserve_crashkernel();
1009 smp_fill_possible_mask();
1011 s390_init_cpu_topology();
1014 * Setup capabilities (ELF_HWCAP & ELF_PLATFORM).
1019 * Create kernel page tables and switch to virtual addressing.
1023 /* Setup default console */
1025 set_preferred_console();
1027 /* Setup zfcpdump support */
1032 static int no_removal_warning __initdata;
1034 static int __init parse_no_removal_warning(char *str)
1036 no_removal_warning = 1;
1039 __setup("no_removal_warning", parse_no_removal_warning);
1041 static int __init removal_warning(void)
1043 if (no_removal_warning)
1045 printk(KERN_ALERT "\n\n");
1046 printk(KERN_CONT "Warning - you are using a 31 bit kernel!\n\n");
1047 printk(KERN_CONT "We plan to remove 31 bit kernel support from the kernel sources in March 2015.\n");
1048 printk(KERN_CONT "Currently we assume that nobody is using the 31 bit kernel on old 31 bit\n");
1049 printk(KERN_CONT "hardware anymore. If you think that the code should not be removed and also\n");
1050 printk(KERN_CONT "future versions of the Linux kernel should be able to run in 31 bit mode\n");
1051 printk(KERN_CONT "please let us know. Please write to:\n");
1052 printk(KERN_CONT "linux390@de.ibm.com (mail address) and/or\n");
1053 printk(KERN_CONT "linux-s390@vger.kernel.org (mailing list).\n\n");
1054 printk(KERN_CONT "Thank you!\n\n");
1055 printk(KERN_CONT "If this kernel runs on a 64 bit machine you may consider using a 64 bit kernel.\n");
1056 printk(KERN_CONT "This message can be disabled with the \"no_removal_warning\" kernel parameter.\n");
1057 schedule_timeout_uninterruptible(300 * HZ);
1060 early_initcall(removal_warning);