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/module.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/uaccess.h>
51 #include <asm/facility.h>
53 #include <asm/mmu_context.h>
54 #include <asm/cpcmd.h>
55 #include <asm/lowcore.h>
58 #include <asm/ptrace.h>
59 #include <asm/sections.h>
60 #include <asm/ebcdic.h>
61 #include <asm/kvm_virtio.h>
63 #include <asm/os_info.h>
67 long psw_kernel_bits = PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_ASC_PRIMARY |
68 PSW_MASK_EA | PSW_MASK_BA;
69 long psw_user_bits = PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT |
70 PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_MCHECK |
71 PSW_MASK_PSTATE | PSW_ASC_HOME;
74 * User copy operations.
76 struct uaccess_ops uaccess;
77 EXPORT_SYMBOL(uaccess);
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 = 0;
92 char elf_platform[ELF_PLATFORM_SIZE];
94 struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS];
96 int __initdata memory_end_set;
97 unsigned long __initdata memory_end;
99 unsigned long VMALLOC_START;
100 EXPORT_SYMBOL(VMALLOC_START);
102 unsigned long VMALLOC_END;
103 EXPORT_SYMBOL(VMALLOC_END);
105 struct page *vmemmap;
106 EXPORT_SYMBOL(vmemmap);
109 unsigned long MODULES_VADDR;
110 unsigned long MODULES_END;
113 /* An array with a pointer to the lowcore of every CPU. */
114 struct _lowcore *lowcore_ptr[NR_CPUS];
115 EXPORT_SYMBOL(lowcore_ptr);
118 * This is set up by the setup-routine at boot-time
119 * for S390 need to find out, what we have to setup
120 * using address 0x10400 ...
123 #include <asm/setup.h>
126 * condev= and conmode= setup parameter.
129 static int __init condev_setup(char *str)
133 vdev = simple_strtoul(str, &str, 0);
134 if (vdev >= 0 && vdev < 65536) {
135 console_devno = vdev;
141 __setup("condev=", condev_setup);
143 static void __init set_preferred_console(void)
145 if (MACHINE_IS_KVM) {
146 if (sclp_has_vt220())
147 add_preferred_console("ttyS", 1, NULL);
148 else if (sclp_has_linemode())
149 add_preferred_console("ttyS", 0, NULL);
151 add_preferred_console("hvc", 0, NULL);
152 } else if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
153 add_preferred_console("ttyS", 0, NULL);
154 else if (CONSOLE_IS_3270)
155 add_preferred_console("tty3270", 0, NULL);
158 static int __init conmode_setup(char *str)
160 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
161 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
164 #if defined(CONFIG_TN3215_CONSOLE)
165 if (strncmp(str, "3215", 5) == 0)
168 #if defined(CONFIG_TN3270_CONSOLE)
169 if (strncmp(str, "3270", 5) == 0)
172 set_preferred_console();
176 __setup("conmode=", conmode_setup);
178 static void __init conmode_default(void)
180 char query_buffer[1024];
184 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
185 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
186 ptr = strstr(query_buffer, "SUBCHANNEL =");
187 console_irq = simple_strtoul(ptr + 13, NULL, 16);
188 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
189 ptr = strstr(query_buffer, "CONMODE");
191 * Set the conmode to 3215 so that the device recognition
192 * will set the cu_type of the console to 3215. If the
193 * conmode is 3270 and we don't set it back then both
194 * 3215 and the 3270 driver will try to access the console
195 * device (3215 as console and 3270 as normal tty).
197 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
199 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
204 if (strncmp(ptr + 8, "3270", 4) == 0) {
205 #if defined(CONFIG_TN3270_CONSOLE)
207 #elif defined(CONFIG_TN3215_CONSOLE)
209 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
212 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
213 #if defined(CONFIG_TN3215_CONSOLE)
215 #elif defined(CONFIG_TN3270_CONSOLE)
217 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
222 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
228 #ifdef CONFIG_ZFCPDUMP
229 static void __init setup_zfcpdump(unsigned int console_devno)
233 if (ipl_info.type != IPL_TYPE_FCP_DUMP)
237 if (console_devno != -1)
238 sprintf(str, " cio_ignore=all,!0.0.%04x,!0.0.%04x",
239 ipl_info.data.fcp.dev_id.devno, console_devno);
241 sprintf(str, " cio_ignore=all,!0.0.%04x",
242 ipl_info.data.fcp.dev_id.devno);
243 strcat(boot_command_line, str);
244 console_loglevel = 2;
247 static inline void setup_zfcpdump(unsigned int console_devno) {}
248 #endif /* CONFIG_ZFCPDUMP */
251 * Reboot, halt and power_off stubs. They just call _machine_restart,
252 * _machine_halt or _machine_power_off.
255 void machine_restart(char *command)
257 if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
259 * Only unblank the console if we are called in enabled
260 * context or a bust_spinlocks cleared the way for us.
263 _machine_restart(command);
266 void machine_halt(void)
268 if (!in_interrupt() || oops_in_progress)
270 * Only unblank the console if we are called in enabled
271 * context or a bust_spinlocks cleared the way for us.
277 void machine_power_off(void)
279 if (!in_interrupt() || oops_in_progress)
281 * Only unblank the console if we are called in enabled
282 * context or a bust_spinlocks cleared the way for us.
285 _machine_power_off();
289 * Dummy power off function.
291 void (*pm_power_off)(void) = machine_power_off;
293 static int __init early_parse_mem(char *p)
295 memory_end = memparse(p, &p);
299 early_param("mem", early_parse_mem);
301 static int __init parse_vmalloc(char *arg)
305 VMALLOC_END = (memparse(arg, &arg) + PAGE_SIZE - 1) & PAGE_MASK;
308 early_param("vmalloc", parse_vmalloc);
310 unsigned int s390_user_mode = PRIMARY_SPACE_MODE;
311 EXPORT_SYMBOL_GPL(s390_user_mode);
313 static void __init set_user_mode_primary(void)
315 psw_kernel_bits = (psw_kernel_bits & ~PSW_MASK_ASC) | PSW_ASC_HOME;
316 psw_user_bits = (psw_user_bits & ~PSW_MASK_ASC) | PSW_ASC_PRIMARY;
319 (psw32_user_bits & ~PSW32_MASK_ASC) | PSW32_ASC_PRIMARY;
321 uaccess = MACHINE_HAS_MVCOS ? uaccess_mvcos_switch : uaccess_pt;
324 static int __init early_parse_user_mode(char *p)
326 if (p && strcmp(p, "primary") == 0)
327 s390_user_mode = PRIMARY_SPACE_MODE;
328 else if (!p || strcmp(p, "home") == 0)
329 s390_user_mode = HOME_SPACE_MODE;
334 early_param("user_mode", early_parse_user_mode);
336 static void __init setup_addressing_mode(void)
338 if (s390_user_mode != PRIMARY_SPACE_MODE)
340 set_user_mode_primary();
341 if (MACHINE_HAS_MVCOS)
342 pr_info("Address spaces switched, mvcos available\n");
344 pr_info("Address spaces switched, mvcos not available\n");
347 void *restart_stack __attribute__((__section__(".data")));
349 static void __init setup_lowcore(void)
354 * Setup lowcore for boot cpu
356 BUILD_BUG_ON(sizeof(struct _lowcore) != LC_PAGES * 4096);
357 lc = __alloc_bootmem_low(LC_PAGES * PAGE_SIZE, LC_PAGES * PAGE_SIZE, 0);
358 lc->restart_psw.mask = psw_kernel_bits;
359 lc->restart_psw.addr =
360 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
361 lc->external_new_psw.mask = psw_kernel_bits |
362 PSW_MASK_DAT | PSW_MASK_MCHECK;
363 lc->external_new_psw.addr =
364 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
365 lc->svc_new_psw.mask = psw_kernel_bits |
366 PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
367 lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
368 lc->program_new_psw.mask = psw_kernel_bits |
369 PSW_MASK_DAT | PSW_MASK_MCHECK;
370 lc->program_new_psw.addr =
371 PSW_ADDR_AMODE | (unsigned long) pgm_check_handler;
372 lc->mcck_new_psw.mask = psw_kernel_bits;
373 lc->mcck_new_psw.addr =
374 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
375 lc->io_new_psw.mask = psw_kernel_bits |
376 PSW_MASK_DAT | PSW_MASK_MCHECK;
377 lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
378 lc->clock_comparator = -1ULL;
379 lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
380 lc->async_stack = (unsigned long)
381 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
382 lc->panic_stack = (unsigned long)
383 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
384 lc->current_task = (unsigned long) init_thread_union.thread_info.task;
385 lc->thread_info = (unsigned long) &init_thread_union;
386 lc->machine_flags = S390_lowcore.machine_flags;
387 lc->stfl_fac_list = S390_lowcore.stfl_fac_list;
388 memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
391 if (MACHINE_HAS_IEEE) {
392 lc->extended_save_area_addr = (__u32)
393 __alloc_bootmem_low(PAGE_SIZE, PAGE_SIZE, 0);
394 /* enable extended save area */
395 __ctl_set_bit(14, 29);
398 lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0];
400 lc->sync_enter_timer = S390_lowcore.sync_enter_timer;
401 lc->async_enter_timer = S390_lowcore.async_enter_timer;
402 lc->exit_timer = S390_lowcore.exit_timer;
403 lc->user_timer = S390_lowcore.user_timer;
404 lc->system_timer = S390_lowcore.system_timer;
405 lc->steal_timer = S390_lowcore.steal_timer;
406 lc->last_update_timer = S390_lowcore.last_update_timer;
407 lc->last_update_clock = S390_lowcore.last_update_clock;
408 lc->ftrace_func = S390_lowcore.ftrace_func;
410 restart_stack = __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0);
411 restart_stack += ASYNC_SIZE;
414 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant
415 * restart data to the absolute zero lowcore. This is necesary if
416 * PSW restart is done on an offline CPU that has lowcore zero.
418 lc->restart_stack = (unsigned long) restart_stack;
419 lc->restart_fn = (unsigned long) do_restart;
420 lc->restart_data = 0;
421 lc->restart_source = -1UL;
423 /* Setup absolute zero lowcore */
424 mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack);
425 mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn);
426 mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data);
427 mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source);
428 mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw);
430 set_prefix((u32)(unsigned long) lc);
434 static struct resource code_resource = {
435 .name = "Kernel code",
436 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
439 static struct resource data_resource = {
440 .name = "Kernel data",
441 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
444 static struct resource bss_resource = {
445 .name = "Kernel bss",
446 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
449 static struct resource __initdata *standard_resources[] = {
455 static void __init setup_resources(void)
457 struct resource *res, *std_res, *sub_res;
460 code_resource.start = (unsigned long) &_text;
461 code_resource.end = (unsigned long) &_etext - 1;
462 data_resource.start = (unsigned long) &_etext;
463 data_resource.end = (unsigned long) &_edata - 1;
464 bss_resource.start = (unsigned long) &__bss_start;
465 bss_resource.end = (unsigned long) &__bss_stop - 1;
467 for (i = 0; i < MEMORY_CHUNKS; i++) {
468 if (!memory_chunk[i].size)
470 if (memory_chunk[i].type == CHUNK_OLDMEM ||
471 memory_chunk[i].type == CHUNK_CRASHK)
473 res = alloc_bootmem_low(sizeof(*res));
474 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
475 switch (memory_chunk[i].type) {
476 case CHUNK_READ_WRITE:
478 res->name = "System RAM";
480 case CHUNK_READ_ONLY:
481 res->name = "System ROM";
482 res->flags |= IORESOURCE_READONLY;
485 res->name = "reserved";
487 res->start = memory_chunk[i].addr;
488 res->end = res->start + memory_chunk[i].size - 1;
489 request_resource(&iomem_resource, res);
491 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
492 std_res = standard_resources[j];
493 if (std_res->start < res->start ||
494 std_res->start > res->end)
496 if (std_res->end > res->end) {
497 sub_res = alloc_bootmem_low(sizeof(*sub_res));
499 sub_res->end = res->end;
500 std_res->start = res->end + 1;
501 request_resource(res, sub_res);
503 request_resource(res, std_res);
509 unsigned long real_memory_size;
510 EXPORT_SYMBOL_GPL(real_memory_size);
512 static void __init setup_memory_end(void)
514 unsigned long vmax, vmalloc_size, tmp;
518 #ifdef CONFIG_ZFCPDUMP
519 if (ipl_info.type == IPL_TYPE_FCP_DUMP && !OLDMEM_BASE) {
520 memory_end = ZFCPDUMP_HSA_SIZE;
524 real_memory_size = 0;
525 memory_end &= PAGE_MASK;
528 * Make sure all chunks are MAX_ORDER aligned so we don't need the
529 * extra checks that HOLES_IN_ZONE would require.
531 for (i = 0; i < MEMORY_CHUNKS; i++) {
532 unsigned long start, end;
533 struct mem_chunk *chunk;
536 chunk = &memory_chunk[i];
537 align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1);
538 start = (chunk->addr + align - 1) & ~(align - 1);
539 end = (chunk->addr + chunk->size) & ~(align - 1);
541 memset(chunk, 0, sizeof(*chunk));
544 chunk->size = end - start;
546 real_memory_size = max(real_memory_size,
547 chunk->addr + chunk->size);
550 /* Choose kernel address space layout: 2, 3, or 4 levels. */
552 vmalloc_size = VMALLOC_END ?: (128UL << 30) - MODULES_LEN;
553 tmp = (memory_end ?: real_memory_size) / PAGE_SIZE;
554 tmp = tmp * (sizeof(struct page) + PAGE_SIZE) + vmalloc_size;
555 if (tmp <= (1UL << 42))
556 vmax = 1UL << 42; /* 3-level kernel page table */
558 vmax = 1UL << 53; /* 4-level kernel page table */
559 /* module area is at the end of the kernel address space. */
561 MODULES_VADDR = MODULES_END - MODULES_LEN;
562 VMALLOC_END = MODULES_VADDR;
564 vmalloc_size = VMALLOC_END ?: 96UL << 20;
565 vmax = 1UL << 31; /* 2-level kernel page table */
566 /* vmalloc area is at the end of the kernel address space. */
569 VMALLOC_START = vmax - vmalloc_size;
571 /* Split remaining virtual space between 1:1 mapping & vmemmap array */
572 tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page));
573 tmp = VMALLOC_START - tmp * sizeof(struct page);
574 tmp &= ~((vmax >> 11) - 1); /* align to page table level */
575 tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS);
576 vmemmap = (struct page *) tmp;
578 /* Take care that memory_end is set and <= vmemmap */
579 memory_end = min(memory_end ?: real_memory_size, tmp);
581 /* Fixup memory chunk array to fit into 0..memory_end */
582 for (i = 0; i < MEMORY_CHUNKS; i++) {
583 struct mem_chunk *chunk = &memory_chunk[i];
585 if (chunk->addr >= memory_end) {
586 memset(chunk, 0, sizeof(*chunk));
589 if (chunk->addr + chunk->size > memory_end)
590 chunk->size = memory_end - chunk->addr;
594 static void __init setup_vmcoreinfo(void)
596 mem_assign_absolute(S390_lowcore.vmcore_info, paddr_vmcoreinfo_note());
599 #ifdef CONFIG_CRASH_DUMP
602 * Find suitable location for crashkernel memory
604 static unsigned long __init find_crash_base(unsigned long crash_size,
607 unsigned long crash_base;
608 struct mem_chunk *chunk;
611 if (memory_chunk[0].size < crash_size) {
612 *msg = "first memory chunk must be at least crashkernel size";
615 if (OLDMEM_BASE && crash_size == OLDMEM_SIZE)
618 for (i = MEMORY_CHUNKS - 1; i >= 0; i--) {
619 chunk = &memory_chunk[i];
620 if (chunk->size == 0)
622 if (chunk->type != CHUNK_READ_WRITE)
624 if (chunk->size < crash_size)
626 crash_base = (chunk->addr + chunk->size) - crash_size;
627 if (crash_base < crash_size)
629 if (crash_base < ZFCPDUMP_HSA_SIZE_MAX)
631 if (crash_base < (unsigned long) INITRD_START + INITRD_SIZE)
635 *msg = "no suitable area found";
640 * Check if crash_base and crash_size is valid
642 static int __init verify_crash_base(unsigned long crash_base,
643 unsigned long crash_size,
646 struct mem_chunk *chunk;
650 * Because we do the swap to zero, we must have at least 'crash_size'
651 * bytes free space before crash_base
653 if (crash_size > crash_base) {
654 *msg = "crashkernel offset must be greater than size";
658 /* First memory chunk must be at least crash_size */
659 if (memory_chunk[0].size < crash_size) {
660 *msg = "first memory chunk must be at least crashkernel size";
663 /* Check if we fit into the respective memory chunk */
664 for (i = 0; i < MEMORY_CHUNKS; i++) {
665 chunk = &memory_chunk[i];
666 if (chunk->size == 0)
668 if (crash_base < chunk->addr)
670 if (crash_base >= chunk->addr + chunk->size)
672 /* we have found the memory chunk */
673 if (crash_base + crash_size > chunk->addr + chunk->size) {
674 *msg = "selected memory chunk is too small for "
675 "crashkernel memory";
680 *msg = "invalid memory range specified";
685 * Reserve kdump memory by creating a memory hole in the mem_chunk array
687 static void __init reserve_kdump_bootmem(unsigned long addr, unsigned long size,
690 create_mem_hole(memory_chunk, addr, size, type);
694 * When kdump is enabled, we have to ensure that no memory from
695 * the area [0 - crashkernel memory size] and
696 * [crashk_res.start - crashk_res.end] is set offline.
698 static int kdump_mem_notifier(struct notifier_block *nb,
699 unsigned long action, void *data)
701 struct memory_notify *arg = data;
703 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
705 if (arg->start_pfn > PFN_DOWN(crashk_res.end))
707 if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start))
712 static struct notifier_block kdump_mem_nb = {
713 .notifier_call = kdump_mem_notifier,
719 * Make sure that oldmem, where the dump is stored, is protected
721 static void reserve_oldmem(void)
723 #ifdef CONFIG_CRASH_DUMP
727 reserve_kdump_bootmem(OLDMEM_BASE, OLDMEM_SIZE, CHUNK_OLDMEM);
728 reserve_kdump_bootmem(OLDMEM_SIZE, memory_end - OLDMEM_SIZE,
730 if (OLDMEM_BASE + OLDMEM_SIZE == real_memory_size)
731 saved_max_pfn = PFN_DOWN(OLDMEM_BASE) - 1;
733 saved_max_pfn = PFN_DOWN(real_memory_size) - 1;
738 * Reserve memory for kdump kernel to be loaded with kexec
740 static void __init reserve_crashkernel(void)
742 #ifdef CONFIG_CRASH_DUMP
743 unsigned long long crash_base, crash_size;
747 rc = parse_crashkernel(boot_command_line, memory_end, &crash_size,
749 if (rc || crash_size == 0)
751 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
752 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
753 if (register_memory_notifier(&kdump_mem_nb))
756 crash_base = find_crash_base(crash_size, &msg);
758 pr_info("crashkernel reservation failed: %s\n", msg);
759 unregister_memory_notifier(&kdump_mem_nb);
762 if (verify_crash_base(crash_base, crash_size, &msg)) {
763 pr_info("crashkernel reservation failed: %s\n", msg);
764 unregister_memory_notifier(&kdump_mem_nb);
767 if (!OLDMEM_BASE && MACHINE_IS_VM)
768 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
769 crashk_res.start = crash_base;
770 crashk_res.end = crash_base + crash_size - 1;
771 insert_resource(&iomem_resource, &crashk_res);
772 reserve_kdump_bootmem(crash_base, crash_size, CHUNK_CRASHK);
773 pr_info("Reserving %lluMB of memory at %lluMB "
774 "for crashkernel (System RAM: %luMB)\n",
775 crash_size >> 20, crash_base >> 20, memory_end >> 20);
776 os_info_crashkernel_add(crash_base, crash_size);
780 static void __init setup_memory(void)
782 unsigned long bootmap_size;
783 unsigned long start_pfn, end_pfn;
787 * partially used pages are not usable - thus
788 * we are rounding upwards:
790 start_pfn = PFN_UP(__pa(&_end));
791 end_pfn = max_pfn = PFN_DOWN(memory_end);
793 #ifdef CONFIG_BLK_DEV_INITRD
795 * Move the initrd in case the bitmap of the bootmem allocater
796 * would overwrite it.
799 if (INITRD_START && INITRD_SIZE) {
800 unsigned long bmap_size;
803 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
804 bmap_size = PFN_PHYS(bmap_size);
806 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
807 start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
809 #ifdef CONFIG_CRASH_DUMP
811 /* Move initrd behind kdump oldmem */
812 if (start + INITRD_SIZE > OLDMEM_BASE &&
813 start < OLDMEM_BASE + OLDMEM_SIZE)
814 start = OLDMEM_BASE + OLDMEM_SIZE;
817 if (start + INITRD_SIZE > memory_end) {
818 pr_err("initrd extends beyond end of "
819 "memory (0x%08lx > 0x%08lx) "
820 "disabling initrd\n",
821 start + INITRD_SIZE, memory_end);
822 INITRD_START = INITRD_SIZE = 0;
824 pr_info("Moving initrd (0x%08lx -> "
825 "0x%08lx, size: %ld)\n",
826 INITRD_START, start, INITRD_SIZE);
827 memmove((void *) start, (void *) INITRD_START,
829 INITRD_START = start;
836 * Initialize the boot-time allocator
838 bootmap_size = init_bootmem(start_pfn, end_pfn);
841 * Register RAM areas with the bootmem allocator.
844 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
845 unsigned long start_chunk, end_chunk, pfn;
847 if (memory_chunk[i].type != CHUNK_READ_WRITE &&
848 memory_chunk[i].type != CHUNK_CRASHK)
850 start_chunk = PFN_DOWN(memory_chunk[i].addr);
851 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size);
852 end_chunk = min(end_chunk, end_pfn);
853 if (start_chunk >= end_chunk)
855 memblock_add_node(PFN_PHYS(start_chunk),
856 PFN_PHYS(end_chunk - start_chunk), 0);
857 pfn = max(start_chunk, start_pfn);
858 storage_key_init_range(PFN_PHYS(pfn), PFN_PHYS(end_chunk));
861 psw_set_key(PAGE_DEFAULT_KEY);
863 free_bootmem_with_active_regions(0, max_pfn);
866 * Reserve memory used for lowcore/command line/kernel image.
868 reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT);
869 reserve_bootmem((unsigned long)_stext,
870 PFN_PHYS(start_pfn) - (unsigned long)_stext,
873 * Reserve the bootmem bitmap itself as well. We do this in two
874 * steps (first step was init_bootmem()) because this catches
875 * the (very unlikely) case of us accidentally initializing the
876 * bootmem allocator with an invalid RAM area.
878 reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size,
881 #ifdef CONFIG_CRASH_DUMP
882 if (crashk_res.start)
883 reserve_bootmem(crashk_res.start,
884 crashk_res.end - crashk_res.start + 1,
886 if (is_kdump_kernel())
887 reserve_bootmem(elfcorehdr_addr - OLDMEM_BASE,
888 PAGE_ALIGN(elfcorehdr_size), BOOTMEM_DEFAULT);
890 #ifdef CONFIG_BLK_DEV_INITRD
891 if (INITRD_START && INITRD_SIZE) {
892 if (INITRD_START + INITRD_SIZE <= memory_end) {
893 reserve_bootmem(INITRD_START, INITRD_SIZE,
895 initrd_start = INITRD_START;
896 initrd_end = initrd_start + INITRD_SIZE;
898 pr_err("initrd extends beyond end of "
899 "memory (0x%08lx > 0x%08lx) "
900 "disabling initrd\n",
901 initrd_start + INITRD_SIZE, memory_end);
902 initrd_start = initrd_end = 0;
909 * Setup hardware capabilities.
911 static void __init setup_hwcaps(void)
913 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
918 * The store facility list bits numbers as found in the principles
919 * of operation are numbered with bit 1UL<<31 as number 0 to
920 * bit 1UL<<0 as number 31.
921 * Bit 0: instructions named N3, "backported" to esa-mode
922 * Bit 2: z/Architecture mode is active
923 * Bit 7: the store-facility-list-extended facility is installed
924 * Bit 17: the message-security assist is installed
925 * Bit 19: the long-displacement facility is installed
926 * Bit 21: the extended-immediate facility is installed
927 * Bit 22: extended-translation facility 3 is installed
928 * Bit 30: extended-translation facility 3 enhancement facility
929 * These get translated to:
930 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
931 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
932 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
933 * HWCAP_S390_ETF3EH bit 8 (22 && 30).
935 for (i = 0; i < 6; i++)
936 if (test_facility(stfl_bits[i]))
937 elf_hwcap |= 1UL << i;
939 if (test_facility(22) && test_facility(30))
940 elf_hwcap |= HWCAP_S390_ETF3EH;
943 * Check for additional facilities with store-facility-list-extended.
944 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
945 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
946 * as stored by stfl, bits 32-xxx contain additional facilities.
947 * How many facility words are stored depends on the number of
948 * doublewords passed to the instruction. The additional facilities
950 * Bit 42: decimal floating point facility is installed
951 * Bit 44: perform floating point operation facility is installed
953 * HWCAP_S390_DFP bit 6 (42 && 44).
955 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
956 elf_hwcap |= HWCAP_S390_DFP;
959 * Huge page support HWCAP_S390_HPAGE is bit 7.
961 if (MACHINE_HAS_HPAGE)
962 elf_hwcap |= HWCAP_S390_HPAGE;
964 #if defined(CONFIG_64BIT)
966 * 64-bit register support for 31-bit processes
967 * HWCAP_S390_HIGH_GPRS is bit 9.
969 elf_hwcap |= HWCAP_S390_HIGH_GPRS;
972 * Transactional execution support HWCAP_S390_TE is bit 10.
974 if (test_facility(50) && test_facility(73))
975 elf_hwcap |= HWCAP_S390_TE;
979 switch (cpu_id.machine) {
981 #if !defined(CONFIG_64BIT)
982 default: /* Use "g5" as default for 31 bit kernels. */
984 strcpy(elf_platform, "g5");
988 #if defined(CONFIG_64BIT)
989 default: /* Use "z900" as default for 64 bit kernels. */
991 strcpy(elf_platform, "z900");
995 strcpy(elf_platform, "z990");
999 strcpy(elf_platform, "z9-109");
1003 strcpy(elf_platform, "z10");
1007 strcpy(elf_platform, "z196");
1010 strcpy(elf_platform, "zEC12");
1016 * Setup function called from init/main.c just after the banner
1020 void __init setup_arch(char **cmdline_p)
1023 * print what head.S has found out about the machine
1025 #ifndef CONFIG_64BIT
1027 pr_info("Linux is running as a z/VM "
1028 "guest operating system in 31-bit mode\n");
1029 else if (MACHINE_IS_LPAR)
1030 pr_info("Linux is running natively in 31-bit mode\n");
1031 if (MACHINE_HAS_IEEE)
1032 pr_info("The hardware system has IEEE compatible "
1033 "floating point units\n");
1035 pr_info("The hardware system has no IEEE compatible "
1036 "floating point units\n");
1037 #else /* CONFIG_64BIT */
1039 pr_info("Linux is running as a z/VM "
1040 "guest operating system in 64-bit mode\n");
1041 else if (MACHINE_IS_KVM)
1042 pr_info("Linux is running under KVM in 64-bit mode\n");
1043 else if (MACHINE_IS_LPAR)
1044 pr_info("Linux is running natively in 64-bit mode\n");
1045 #endif /* CONFIG_64BIT */
1047 /* Have one command line that is parsed and saved in /proc/cmdline */
1048 /* boot_command_line has been already set up in early.c */
1049 *cmdline_p = boot_command_line;
1051 ROOT_DEV = Root_RAM0;
1053 init_mm.start_code = PAGE_OFFSET;
1054 init_mm.end_code = (unsigned long) &_etext;
1055 init_mm.end_data = (unsigned long) &_edata;
1056 init_mm.brk = (unsigned long) &_end;
1058 if (MACHINE_HAS_MVCOS)
1059 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
1061 memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
1063 parse_early_param();
1068 setup_addressing_mode();
1070 reserve_crashkernel();
1077 s390_init_cpu_topology();
1080 * Setup capabilities (ELF_HWCAP & ELF_PLATFORM).
1085 * Create kernel page tables and switch to virtual addressing.
1089 /* Setup default console */
1091 set_preferred_console();
1093 /* Setup zfcpdump support */
1094 setup_zfcpdump(console_devno);