2 * arch/s390/kernel/setup.c
5 * Copyright (C) IBM Corp. 1999,2010
6 * Author(s): Hartmut Penner (hp@de.ibm.com),
7 * Martin Schwidefsky (schwidefsky@de.ibm.com)
9 * Derived from "arch/i386/kernel/setup.c"
10 * Copyright (C) 1995, Linus Torvalds
14 * This file handles the architecture-dependent parts of initialization
17 #define KMSG_COMPONENT "setup"
18 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
20 #include <linux/errno.h>
21 #include <linux/module.h>
22 #include <linux/sched.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/user.h>
30 #include <linux/tty.h>
31 #include <linux/ioport.h>
32 #include <linux/delay.h>
33 #include <linux/init.h>
34 #include <linux/initrd.h>
35 #include <linux/bootmem.h>
36 #include <linux/root_dev.h>
37 #include <linux/console.h>
38 #include <linux/kernel_stat.h>
39 #include <linux/device.h>
40 #include <linux/notifier.h>
41 #include <linux/pfn.h>
42 #include <linux/ctype.h>
43 #include <linux/reboot.h>
44 #include <linux/topology.h>
45 #include <linux/ftrace.h>
46 #include <linux/kexec.h>
47 #include <linux/crash_dump.h>
48 #include <linux/memory.h>
51 #include <asm/uaccess.h>
52 #include <asm/system.h>
54 #include <asm/mmu_context.h>
55 #include <asm/cpcmd.h>
56 #include <asm/lowcore.h>
59 #include <asm/ptrace.h>
60 #include <asm/sections.h>
61 #include <asm/ebcdic.h>
62 #include <asm/compat.h>
63 #include <asm/kvm_virtio.h>
66 long psw_kernel_bits = PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_ASC_PRIMARY |
67 PSW_MASK_EA | PSW_MASK_BA;
68 long psw_user_bits = PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT |
69 PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_MCHECK |
70 PSW_MASK_PSTATE | PSW_ASC_HOME;
73 * User copy operations.
75 struct uaccess_ops uaccess;
76 EXPORT_SYMBOL(uaccess);
81 unsigned int console_mode = 0;
82 EXPORT_SYMBOL(console_mode);
84 unsigned int console_devno = -1;
85 EXPORT_SYMBOL(console_devno);
87 unsigned int console_irq = -1;
88 EXPORT_SYMBOL(console_irq);
90 unsigned long elf_hwcap = 0;
91 char elf_platform[ELF_PLATFORM_SIZE];
93 struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS];
95 int __initdata memory_end_set;
96 unsigned long __initdata memory_end;
98 /* An array with a pointer to the lowcore of every CPU. */
99 struct _lowcore *lowcore_ptr[NR_CPUS];
100 EXPORT_SYMBOL(lowcore_ptr);
103 * This is set up by the setup-routine at boot-time
104 * for S390 need to find out, what we have to setup
105 * using address 0x10400 ...
108 #include <asm/setup.h>
111 * condev= and conmode= setup parameter.
114 static int __init condev_setup(char *str)
118 vdev = simple_strtoul(str, &str, 0);
119 if (vdev >= 0 && vdev < 65536) {
120 console_devno = vdev;
126 __setup("condev=", condev_setup);
128 static void __init set_preferred_console(void)
131 add_preferred_console("hvc", 0, NULL);
132 else if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
133 add_preferred_console("ttyS", 0, NULL);
134 else if (CONSOLE_IS_3270)
135 add_preferred_console("tty3270", 0, NULL);
138 static int __init conmode_setup(char *str)
140 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
141 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
144 #if defined(CONFIG_TN3215_CONSOLE)
145 if (strncmp(str, "3215", 5) == 0)
148 #if defined(CONFIG_TN3270_CONSOLE)
149 if (strncmp(str, "3270", 5) == 0)
152 set_preferred_console();
156 __setup("conmode=", conmode_setup);
158 static void __init conmode_default(void)
160 char query_buffer[1024];
164 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
165 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
166 ptr = strstr(query_buffer, "SUBCHANNEL =");
167 console_irq = simple_strtoul(ptr + 13, NULL, 16);
168 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
169 ptr = strstr(query_buffer, "CONMODE");
171 * Set the conmode to 3215 so that the device recognition
172 * will set the cu_type of the console to 3215. If the
173 * conmode is 3270 and we don't set it back then both
174 * 3215 and the 3270 driver will try to access the console
175 * device (3215 as console and 3270 as normal tty).
177 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
179 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
184 if (strncmp(ptr + 8, "3270", 4) == 0) {
185 #if defined(CONFIG_TN3270_CONSOLE)
187 #elif defined(CONFIG_TN3215_CONSOLE)
189 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
192 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
193 #if defined(CONFIG_TN3215_CONSOLE)
195 #elif defined(CONFIG_TN3270_CONSOLE)
197 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
202 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
208 #ifdef CONFIG_ZFCPDUMP
209 static void __init setup_zfcpdump(unsigned int console_devno)
213 if (ipl_info.type != IPL_TYPE_FCP_DUMP)
217 if (console_devno != -1)
218 sprintf(str, " cio_ignore=all,!0.0.%04x,!0.0.%04x",
219 ipl_info.data.fcp.dev_id.devno, console_devno);
221 sprintf(str, " cio_ignore=all,!0.0.%04x",
222 ipl_info.data.fcp.dev_id.devno);
223 strcat(boot_command_line, str);
224 console_loglevel = 2;
227 static inline void setup_zfcpdump(unsigned int console_devno) {}
228 #endif /* CONFIG_ZFCPDUMP */
231 * Reboot, halt and power_off stubs. They just call _machine_restart,
232 * _machine_halt or _machine_power_off.
235 void machine_restart(char *command)
237 if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
239 * Only unblank the console if we are called in enabled
240 * context or a bust_spinlocks cleared the way for us.
243 _machine_restart(command);
246 void machine_halt(void)
248 if (!in_interrupt() || oops_in_progress)
250 * Only unblank the console if we are called in enabled
251 * context or a bust_spinlocks cleared the way for us.
257 void machine_power_off(void)
259 if (!in_interrupt() || oops_in_progress)
261 * Only unblank the console if we are called in enabled
262 * context or a bust_spinlocks cleared the way for us.
265 _machine_power_off();
269 * Dummy power off function.
271 void (*pm_power_off)(void) = machine_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 unsigned int user_mode = HOME_SPACE_MODE;
282 EXPORT_SYMBOL_GPL(user_mode);
284 static int set_amode_primary(void)
286 psw_kernel_bits = (psw_kernel_bits & ~PSW_MASK_ASC) | PSW_ASC_HOME;
287 psw_user_bits = (psw_user_bits & ~PSW_MASK_ASC) | PSW_ASC_PRIMARY;
290 (psw32_user_bits & ~PSW32_MASK_ASC) | PSW32_ASC_PRIMARY;
293 if (MACHINE_HAS_MVCOS) {
294 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess));
297 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess));
303 * Switch kernel/user addressing modes?
305 static int __init early_parse_switch_amode(char *p)
307 user_mode = PRIMARY_SPACE_MODE;
310 early_param("switch_amode", early_parse_switch_amode);
312 static int __init early_parse_user_mode(char *p)
314 if (p && strcmp(p, "primary") == 0)
315 user_mode = PRIMARY_SPACE_MODE;
316 else if (!p || strcmp(p, "home") == 0)
317 user_mode = HOME_SPACE_MODE;
322 early_param("user_mode", early_parse_user_mode);
324 static void setup_addressing_mode(void)
326 if (user_mode == PRIMARY_SPACE_MODE) {
327 if (set_amode_primary())
328 pr_info("Address spaces switched, "
329 "mvcos available\n");
331 pr_info("Address spaces switched, "
332 "mvcos not available\n");
342 * Setup lowcore for boot cpu
344 BUILD_BUG_ON(sizeof(struct _lowcore) != LC_PAGES * 4096);
345 lc = __alloc_bootmem_low(LC_PAGES * PAGE_SIZE, LC_PAGES * PAGE_SIZE, 0);
346 lc->restart_psw.mask = psw_kernel_bits;
347 lc->restart_psw.addr =
348 PSW_ADDR_AMODE | (unsigned long) psw_restart_int_handler;
349 lc->external_new_psw.mask = psw_kernel_bits |
350 PSW_MASK_DAT | PSW_MASK_MCHECK;
351 lc->external_new_psw.addr =
352 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
353 lc->svc_new_psw.mask = psw_kernel_bits |
354 PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
355 lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
356 lc->program_new_psw.mask = psw_kernel_bits |
357 PSW_MASK_DAT | PSW_MASK_MCHECK;
358 lc->program_new_psw.addr =
359 PSW_ADDR_AMODE | (unsigned long) pgm_check_handler;
360 lc->mcck_new_psw.mask = psw_kernel_bits;
361 lc->mcck_new_psw.addr =
362 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
363 lc->io_new_psw.mask = psw_kernel_bits |
364 PSW_MASK_DAT | PSW_MASK_MCHECK;
365 lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
366 lc->clock_comparator = -1ULL;
367 lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
368 lc->async_stack = (unsigned long)
369 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
370 lc->panic_stack = (unsigned long)
371 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
372 lc->current_task = (unsigned long) init_thread_union.thread_info.task;
373 lc->thread_info = (unsigned long) &init_thread_union;
374 lc->machine_flags = S390_lowcore.machine_flags;
375 lc->stfl_fac_list = S390_lowcore.stfl_fac_list;
376 memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
379 if (MACHINE_HAS_IEEE) {
380 lc->extended_save_area_addr = (__u32)
381 __alloc_bootmem_low(PAGE_SIZE, PAGE_SIZE, 0);
382 /* enable extended save area */
383 __ctl_set_bit(14, 29);
387 lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0];
389 lc->sync_enter_timer = S390_lowcore.sync_enter_timer;
390 lc->async_enter_timer = S390_lowcore.async_enter_timer;
391 lc->exit_timer = S390_lowcore.exit_timer;
392 lc->user_timer = S390_lowcore.user_timer;
393 lc->system_timer = S390_lowcore.system_timer;
394 lc->steal_timer = S390_lowcore.steal_timer;
395 lc->last_update_timer = S390_lowcore.last_update_timer;
396 lc->last_update_clock = S390_lowcore.last_update_clock;
397 lc->ftrace_func = S390_lowcore.ftrace_func;
398 set_prefix((u32)(unsigned long) lc);
402 static struct resource code_resource = {
403 .name = "Kernel code",
404 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
407 static struct resource data_resource = {
408 .name = "Kernel data",
409 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
412 static struct resource bss_resource = {
413 .name = "Kernel bss",
414 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
417 static struct resource __initdata *standard_resources[] = {
423 static void __init setup_resources(void)
425 struct resource *res, *std_res, *sub_res;
428 code_resource.start = (unsigned long) &_text;
429 code_resource.end = (unsigned long) &_etext - 1;
430 data_resource.start = (unsigned long) &_etext;
431 data_resource.end = (unsigned long) &_edata - 1;
432 bss_resource.start = (unsigned long) &__bss_start;
433 bss_resource.end = (unsigned long) &__bss_stop - 1;
435 for (i = 0; i < MEMORY_CHUNKS; i++) {
436 if (!memory_chunk[i].size)
438 if (memory_chunk[i].type == CHUNK_OLDMEM ||
439 memory_chunk[i].type == CHUNK_CRASHK)
441 res = alloc_bootmem_low(sizeof(*res));
442 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
443 switch (memory_chunk[i].type) {
444 case CHUNK_READ_WRITE:
446 res->name = "System RAM";
448 case CHUNK_READ_ONLY:
449 res->name = "System ROM";
450 res->flags |= IORESOURCE_READONLY;
453 res->name = "reserved";
455 res->start = memory_chunk[i].addr;
456 res->end = res->start + memory_chunk[i].size - 1;
457 request_resource(&iomem_resource, res);
459 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
460 std_res = standard_resources[j];
461 if (std_res->start < res->start ||
462 std_res->start > res->end)
464 if (std_res->end > res->end) {
465 sub_res = alloc_bootmem_low(sizeof(*sub_res));
467 sub_res->end = res->end;
468 std_res->start = res->end + 1;
469 request_resource(res, sub_res);
471 request_resource(res, std_res);
477 unsigned long real_memory_size;
478 EXPORT_SYMBOL_GPL(real_memory_size);
480 static void __init setup_memory_end(void)
482 unsigned long memory_size;
483 unsigned long max_mem;
487 #ifdef CONFIG_ZFCPDUMP
488 if (ipl_info.type == IPL_TYPE_FCP_DUMP && !OLDMEM_BASE) {
489 memory_end = ZFCPDUMP_HSA_SIZE;
494 memory_end &= PAGE_MASK;
496 max_mem = memory_end ? min(VMEM_MAX_PHYS, memory_end) : VMEM_MAX_PHYS;
497 memory_end = min(max_mem, memory_end);
500 * Make sure all chunks are MAX_ORDER aligned so we don't need the
501 * extra checks that HOLES_IN_ZONE would require.
503 for (i = 0; i < MEMORY_CHUNKS; i++) {
504 unsigned long start, end;
505 struct mem_chunk *chunk;
508 chunk = &memory_chunk[i];
509 align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1);
510 start = (chunk->addr + align - 1) & ~(align - 1);
511 end = (chunk->addr + chunk->size) & ~(align - 1);
513 memset(chunk, 0, sizeof(*chunk));
516 chunk->size = end - start;
520 for (i = 0; i < MEMORY_CHUNKS; i++) {
521 struct mem_chunk *chunk = &memory_chunk[i];
523 real_memory_size = max(real_memory_size,
524 chunk->addr + chunk->size);
525 if (chunk->addr >= max_mem) {
526 memset(chunk, 0, sizeof(*chunk));
529 if (chunk->addr + chunk->size > max_mem)
530 chunk->size = max_mem - chunk->addr;
531 memory_size = max(memory_size, chunk->addr + chunk->size);
534 memory_end = memory_size;
537 void *restart_stack __attribute__((__section__(".data")));
540 * Setup new PSW and allocate stack for PSW restart interrupt
542 static void __init setup_restart_psw(void)
546 restart_stack = __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0);
547 restart_stack += ASYNC_SIZE;
550 * Setup restart PSW for absolute zero lowcore. This is necesary
551 * if PSW restart is done on an offline CPU that has lowcore zero
553 psw.mask = PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_EA | PSW_MASK_BA;
554 psw.addr = PSW_ADDR_AMODE | (unsigned long) psw_restart_int_handler;
555 copy_to_absolute_zero(&S390_lowcore.restart_psw, &psw, sizeof(psw));
558 static void __init setup_vmcoreinfo(void)
561 unsigned long ptr = paddr_vmcoreinfo_note();
563 copy_to_absolute_zero(&S390_lowcore.vmcore_info, &ptr, sizeof(ptr));
567 #ifdef CONFIG_CRASH_DUMP
570 * Find suitable location for crashkernel memory
572 static unsigned long __init find_crash_base(unsigned long crash_size,
575 unsigned long crash_base;
576 struct mem_chunk *chunk;
579 if (memory_chunk[0].size < crash_size) {
580 *msg = "first memory chunk must be at least crashkernel size";
583 if (OLDMEM_BASE && crash_size == OLDMEM_SIZE)
586 for (i = MEMORY_CHUNKS - 1; i >= 0; i--) {
587 chunk = &memory_chunk[i];
588 if (chunk->size == 0)
590 if (chunk->type != CHUNK_READ_WRITE)
592 if (chunk->size < crash_size)
594 crash_base = (chunk->addr + chunk->size) - crash_size;
595 if (crash_base < crash_size)
597 if (crash_base < ZFCPDUMP_HSA_SIZE_MAX)
599 if (crash_base < (unsigned long) INITRD_START + INITRD_SIZE)
603 *msg = "no suitable area found";
608 * Check if crash_base and crash_size is valid
610 static int __init verify_crash_base(unsigned long crash_base,
611 unsigned long crash_size,
614 struct mem_chunk *chunk;
618 * Because we do the swap to zero, we must have at least 'crash_size'
619 * bytes free space before crash_base
621 if (crash_size > crash_base) {
622 *msg = "crashkernel offset must be greater than size";
626 /* First memory chunk must be at least crash_size */
627 if (memory_chunk[0].size < crash_size) {
628 *msg = "first memory chunk must be at least crashkernel size";
631 /* Check if we fit into the respective memory chunk */
632 for (i = 0; i < MEMORY_CHUNKS; i++) {
633 chunk = &memory_chunk[i];
634 if (chunk->size == 0)
636 if (crash_base < chunk->addr)
638 if (crash_base >= chunk->addr + chunk->size)
640 /* we have found the memory chunk */
641 if (crash_base + crash_size > chunk->addr + chunk->size) {
642 *msg = "selected memory chunk is too small for "
643 "crashkernel memory";
648 *msg = "invalid memory range specified";
653 * Reserve kdump memory by creating a memory hole in the mem_chunk array
655 static void __init reserve_kdump_bootmem(unsigned long addr, unsigned long size,
659 create_mem_hole(memory_chunk, addr, size, type);
663 * When kdump is enabled, we have to ensure that no memory from
664 * the area [0 - crashkernel memory size] and
665 * [crashk_res.start - crashk_res.end] is set offline.
667 static int kdump_mem_notifier(struct notifier_block *nb,
668 unsigned long action, void *data)
670 struct memory_notify *arg = data;
672 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
674 if (arg->start_pfn > PFN_DOWN(crashk_res.end))
676 if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start))
681 static struct notifier_block kdump_mem_nb = {
682 .notifier_call = kdump_mem_notifier,
688 * Make sure that oldmem, where the dump is stored, is protected
690 static void reserve_oldmem(void)
692 #ifdef CONFIG_CRASH_DUMP
696 reserve_kdump_bootmem(OLDMEM_BASE, OLDMEM_SIZE, CHUNK_OLDMEM);
697 reserve_kdump_bootmem(OLDMEM_SIZE, memory_end - OLDMEM_SIZE,
699 if (OLDMEM_BASE + OLDMEM_SIZE == real_memory_size)
700 saved_max_pfn = PFN_DOWN(OLDMEM_BASE) - 1;
702 saved_max_pfn = PFN_DOWN(real_memory_size) - 1;
707 * Reserve memory for kdump kernel to be loaded with kexec
709 static void __init reserve_crashkernel(void)
711 #ifdef CONFIG_CRASH_DUMP
712 unsigned long long crash_base, crash_size;
716 rc = parse_crashkernel(boot_command_line, memory_end, &crash_size,
718 if (rc || crash_size == 0)
720 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
721 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
722 if (register_memory_notifier(&kdump_mem_nb))
725 crash_base = find_crash_base(crash_size, &msg);
727 pr_info("crashkernel reservation failed: %s\n", msg);
728 unregister_memory_notifier(&kdump_mem_nb);
731 if (verify_crash_base(crash_base, crash_size, &msg)) {
732 pr_info("crashkernel reservation failed: %s\n", msg);
733 unregister_memory_notifier(&kdump_mem_nb);
736 if (!OLDMEM_BASE && MACHINE_IS_VM)
737 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
738 crashk_res.start = crash_base;
739 crashk_res.end = crash_base + crash_size - 1;
740 insert_resource(&iomem_resource, &crashk_res);
741 reserve_kdump_bootmem(crash_base, crash_size, CHUNK_CRASHK);
742 pr_info("Reserving %lluMB of memory at %lluMB "
743 "for crashkernel (System RAM: %luMB)\n",
744 crash_size >> 20, crash_base >> 20, memory_end >> 20);
751 unsigned long bootmap_size;
752 unsigned long start_pfn, end_pfn;
756 * partially used pages are not usable - thus
757 * we are rounding upwards:
759 start_pfn = PFN_UP(__pa(&_end));
760 end_pfn = max_pfn = PFN_DOWN(memory_end);
762 #ifdef CONFIG_BLK_DEV_INITRD
764 * Move the initrd in case the bitmap of the bootmem allocater
765 * would overwrite it.
768 if (INITRD_START && INITRD_SIZE) {
769 unsigned long bmap_size;
772 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
773 bmap_size = PFN_PHYS(bmap_size);
775 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
776 start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
778 #ifdef CONFIG_CRASH_DUMP
780 /* Move initrd behind kdump oldmem */
781 if (start + INITRD_SIZE > OLDMEM_BASE &&
782 start < OLDMEM_BASE + OLDMEM_SIZE)
783 start = OLDMEM_BASE + OLDMEM_SIZE;
786 if (start + INITRD_SIZE > memory_end) {
787 pr_err("initrd extends beyond end of "
788 "memory (0x%08lx > 0x%08lx) "
789 "disabling initrd\n",
790 start + INITRD_SIZE, memory_end);
791 INITRD_START = INITRD_SIZE = 0;
793 pr_info("Moving initrd (0x%08lx -> "
794 "0x%08lx, size: %ld)\n",
795 INITRD_START, start, INITRD_SIZE);
796 memmove((void *) start, (void *) INITRD_START,
798 INITRD_START = start;
805 * Initialize the boot-time allocator
807 bootmap_size = init_bootmem(start_pfn, end_pfn);
810 * Register RAM areas with the bootmem allocator.
813 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
814 unsigned long start_chunk, end_chunk, pfn;
816 if (memory_chunk[i].type != CHUNK_READ_WRITE &&
817 memory_chunk[i].type != CHUNK_CRASHK)
819 start_chunk = PFN_DOWN(memory_chunk[i].addr);
820 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size);
821 end_chunk = min(end_chunk, end_pfn);
822 if (start_chunk >= end_chunk)
824 memblock_add_node(PFN_PHYS(start_chunk),
825 PFN_PHYS(end_chunk - start_chunk), 0);
826 pfn = max(start_chunk, start_pfn);
827 for (; pfn < end_chunk; pfn++)
828 page_set_storage_key(PFN_PHYS(pfn),
829 PAGE_DEFAULT_KEY, 0);
832 psw_set_key(PAGE_DEFAULT_KEY);
834 free_bootmem_with_active_regions(0, max_pfn);
837 * Reserve memory used for lowcore/command line/kernel image.
839 reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT);
840 reserve_bootmem((unsigned long)_stext,
841 PFN_PHYS(start_pfn) - (unsigned long)_stext,
844 * Reserve the bootmem bitmap itself as well. We do this in two
845 * steps (first step was init_bootmem()) because this catches
846 * the (very unlikely) case of us accidentally initializing the
847 * bootmem allocator with an invalid RAM area.
849 reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size,
852 #ifdef CONFIG_CRASH_DUMP
853 if (crashk_res.start)
854 reserve_bootmem(crashk_res.start,
855 crashk_res.end - crashk_res.start + 1,
857 if (is_kdump_kernel())
858 reserve_bootmem(elfcorehdr_addr - OLDMEM_BASE,
859 PAGE_ALIGN(elfcorehdr_size), BOOTMEM_DEFAULT);
861 #ifdef CONFIG_BLK_DEV_INITRD
862 if (INITRD_START && INITRD_SIZE) {
863 if (INITRD_START + INITRD_SIZE <= memory_end) {
864 reserve_bootmem(INITRD_START, INITRD_SIZE,
866 initrd_start = INITRD_START;
867 initrd_end = initrd_start + INITRD_SIZE;
869 pr_err("initrd extends beyond end of "
870 "memory (0x%08lx > 0x%08lx) "
871 "disabling initrd\n",
872 initrd_start + INITRD_SIZE, memory_end);
873 initrd_start = initrd_end = 0;
880 * Setup hardware capabilities.
882 static void __init setup_hwcaps(void)
884 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
889 * The store facility list bits numbers as found in the principles
890 * of operation are numbered with bit 1UL<<31 as number 0 to
891 * bit 1UL<<0 as number 31.
892 * Bit 0: instructions named N3, "backported" to esa-mode
893 * Bit 2: z/Architecture mode is active
894 * Bit 7: the store-facility-list-extended facility is installed
895 * Bit 17: the message-security assist is installed
896 * Bit 19: the long-displacement facility is installed
897 * Bit 21: the extended-immediate facility is installed
898 * Bit 22: extended-translation facility 3 is installed
899 * Bit 30: extended-translation facility 3 enhancement facility
900 * These get translated to:
901 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
902 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
903 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
904 * HWCAP_S390_ETF3EH bit 8 (22 && 30).
906 for (i = 0; i < 6; i++)
907 if (test_facility(stfl_bits[i]))
908 elf_hwcap |= 1UL << i;
910 if (test_facility(22) && test_facility(30))
911 elf_hwcap |= HWCAP_S390_ETF3EH;
914 * Check for additional facilities with store-facility-list-extended.
915 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
916 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
917 * as stored by stfl, bits 32-xxx contain additional facilities.
918 * How many facility words are stored depends on the number of
919 * doublewords passed to the instruction. The additional facilities
921 * Bit 42: decimal floating point facility is installed
922 * Bit 44: perform floating point operation facility is installed
924 * HWCAP_S390_DFP bit 6 (42 && 44).
926 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
927 elf_hwcap |= HWCAP_S390_DFP;
930 * Huge page support HWCAP_S390_HPAGE is bit 7.
932 if (MACHINE_HAS_HPAGE)
933 elf_hwcap |= HWCAP_S390_HPAGE;
936 * 64-bit register support for 31-bit processes
937 * HWCAP_S390_HIGH_GPRS is bit 9.
939 elf_hwcap |= HWCAP_S390_HIGH_GPRS;
942 switch (cpu_id.machine) {
944 #if !defined(CONFIG_64BIT)
945 default: /* Use "g5" as default for 31 bit kernels. */
947 strcpy(elf_platform, "g5");
951 #if defined(CONFIG_64BIT)
952 default: /* Use "z900" as default for 64 bit kernels. */
954 strcpy(elf_platform, "z900");
958 strcpy(elf_platform, "z990");
962 strcpy(elf_platform, "z9-109");
966 strcpy(elf_platform, "z10");
970 strcpy(elf_platform, "z196");
976 * Setup function called from init/main.c just after the banner
981 setup_arch(char **cmdline_p)
984 * print what head.S has found out about the machine
988 pr_info("Linux is running as a z/VM "
989 "guest operating system in 31-bit mode\n");
990 else if (MACHINE_IS_LPAR)
991 pr_info("Linux is running natively in 31-bit mode\n");
992 if (MACHINE_HAS_IEEE)
993 pr_info("The hardware system has IEEE compatible "
994 "floating point units\n");
996 pr_info("The hardware system has no IEEE compatible "
997 "floating point units\n");
998 #else /* CONFIG_64BIT */
1000 pr_info("Linux is running as a z/VM "
1001 "guest operating system in 64-bit mode\n");
1002 else if (MACHINE_IS_KVM)
1003 pr_info("Linux is running under KVM in 64-bit mode\n");
1004 else if (MACHINE_IS_LPAR)
1005 pr_info("Linux is running natively in 64-bit mode\n");
1006 #endif /* CONFIG_64BIT */
1008 /* Have one command line that is parsed and saved in /proc/cmdline */
1009 /* boot_command_line has been already set up in early.c */
1010 *cmdline_p = boot_command_line;
1012 ROOT_DEV = Root_RAM0;
1014 init_mm.start_code = PAGE_OFFSET;
1015 init_mm.end_code = (unsigned long) &_etext;
1016 init_mm.end_data = (unsigned long) &_edata;
1017 init_mm.brk = (unsigned long) &_end;
1019 if (MACHINE_HAS_MVCOS)
1020 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
1022 memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
1024 parse_early_param();
1028 setup_addressing_mode();
1030 reserve_crashkernel();
1034 setup_restart_psw();
1038 s390_init_cpu_topology();
1041 * Setup capabilities (ELF_HWCAP & ELF_PLATFORM).
1046 * Create kernel page tables and switch to virtual addressing.
1050 /* Setup default console */
1052 set_preferred_console();
1054 /* Setup zfcpdump support */
1055 setup_zfcpdump(console_devno);