source: src/linux/universal/linux-3.18/arch/s390/kernel/setup.c @ 31869

Last change on this file since 31869 was 31869, checked in by brainslayer, 6 weeks ago

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1/*
2 *  S390 version
3 *    Copyright IBM Corp. 1999, 2012
4 *    Author(s): Hartmut Penner (hp@de.ibm.com),
5 *               Martin Schwidefsky (schwidefsky@de.ibm.com)
6 *
7 *  Derived from "arch/i386/kernel/setup.c"
8 *    Copyright (C) 1995, Linus Torvalds
9 */
10
11/*
12 * This file handles the architecture-dependent parts of initialization
13 */
14
15#define KMSG_COMPONENT "setup"
16#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
17
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>
23#include <linux/mm.h>
24#include <linux/stddef.h>
25#include <linux/unistd.h>
26#include <linux/ptrace.h>
27#include <linux/random.h>
28#include <linux/user.h>
29#include <linux/tty.h>
30#include <linux/ioport.h>
31#include <linux/delay.h>
32#include <linux/init.h>
33#include <linux/initrd.h>
34#include <linux/bootmem.h>
35#include <linux/root_dev.h>
36#include <linux/console.h>
37#include <linux/kernel_stat.h>
38#include <linux/device.h>
39#include <linux/notifier.h>
40#include <linux/pfn.h>
41#include <linux/ctype.h>
42#include <linux/reboot.h>
43#include <linux/topology.h>
44#include <linux/ftrace.h>
45#include <linux/kexec.h>
46#include <linux/crash_dump.h>
47#include <linux/memory.h>
48#include <linux/compat.h>
49
50#include <asm/ipl.h>
51#include <asm/facility.h>
52#include <asm/smp.h>
53#include <asm/mmu_context.h>
54#include <asm/cpcmd.h>
55#include <asm/lowcore.h>
56#include <asm/irq.h>
57#include <asm/page.h>
58#include <asm/ptrace.h>
59#include <asm/sections.h>
60#include <asm/ebcdic.h>
61#include <asm/kvm_virtio.h>
62#include <asm/diag.h>
63#include <asm/os_info.h>
64#include <asm/sclp.h>
65#include <asm/sysinfo.h>
66#include "entry.h"
67
68/*
69 * Machine setup..
70 */
71unsigned int console_mode = 0;
72EXPORT_SYMBOL(console_mode);
73
74unsigned int console_devno = -1;
75EXPORT_SYMBOL(console_devno);
76
77unsigned int console_irq = -1;
78EXPORT_SYMBOL(console_irq);
79
80unsigned long elf_hwcap = 0;
81char elf_platform[ELF_PLATFORM_SIZE];
82
83int __initdata memory_end_set;
84unsigned long __initdata memory_end;
85unsigned long __initdata max_physmem_end;
86
87unsigned long VMALLOC_START;
88EXPORT_SYMBOL(VMALLOC_START);
89
90unsigned long VMALLOC_END;
91EXPORT_SYMBOL(VMALLOC_END);
92
93struct page *vmemmap;
94EXPORT_SYMBOL(vmemmap);
95
96#ifdef CONFIG_64BIT
97unsigned long MODULES_VADDR;
98unsigned long MODULES_END;
99#endif
100
101/* An array with a pointer to the lowcore of every CPU. */
102struct _lowcore *lowcore_ptr[NR_CPUS];
103EXPORT_SYMBOL(lowcore_ptr);
104
105/*
106 * This is set up by the setup-routine at boot-time
107 * for S390 need to find out, what we have to setup
108 * using address 0x10400 ...
109 */
110
111#include <asm/setup.h>
112
113/*
114 * condev= and conmode= setup parameter.
115 */
116
117static int __init condev_setup(char *str)
118{
119        int vdev;
120
121        vdev = simple_strtoul(str, &str, 0);
122        if (vdev >= 0 && vdev < 65536) {
123                console_devno = vdev;
124                console_irq = -1;
125        }
126        return 1;
127}
128
129__setup("condev=", condev_setup);
130
131static void __init set_preferred_console(void)
132{
133        if (MACHINE_IS_KVM) {
134                if (sclp_has_vt220())
135                        add_preferred_console("ttyS", 1, NULL);
136                else if (sclp_has_linemode())
137                        add_preferred_console("ttyS", 0, NULL);
138                else
139                        add_preferred_console("hvc", 0, NULL);
140        } else if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
141                add_preferred_console("ttyS", 0, NULL);
142        else if (CONSOLE_IS_3270)
143                add_preferred_console("tty3270", 0, NULL);
144}
145
146static int __init conmode_setup(char *str)
147{
148#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
149        if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
150                SET_CONSOLE_SCLP;
151#endif
152#if defined(CONFIG_TN3215_CONSOLE)
153        if (strncmp(str, "3215", 5) == 0)
154                SET_CONSOLE_3215;
155#endif
156#if defined(CONFIG_TN3270_CONSOLE)
157        if (strncmp(str, "3270", 5) == 0)
158                SET_CONSOLE_3270;
159#endif
160        set_preferred_console();
161        return 1;
162}
163
164__setup("conmode=", conmode_setup);
165
166static void __init conmode_default(void)
167{
168        char query_buffer[1024];
169        char *ptr;
170
171        if (MACHINE_IS_VM) {
172                cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
173                console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
174                ptr = strstr(query_buffer, "SUBCHANNEL =");
175                console_irq = simple_strtoul(ptr + 13, NULL, 16);
176                cpcmd("QUERY TERM", query_buffer, 1024, NULL);
177                ptr = strstr(query_buffer, "CONMODE");
178                /*
179                 * Set the conmode to 3215 so that the device recognition
180                 * will set the cu_type of the console to 3215. If the
181                 * conmode is 3270 and we don't set it back then both
182                 * 3215 and the 3270 driver will try to access the console
183                 * device (3215 as console and 3270 as normal tty).
184                 */
185                cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
186                if (ptr == NULL) {
187#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
188                        SET_CONSOLE_SCLP;
189#endif
190                        return;
191                }
192                if (strncmp(ptr + 8, "3270", 4) == 0) {
193#if defined(CONFIG_TN3270_CONSOLE)
194                        SET_CONSOLE_3270;
195#elif defined(CONFIG_TN3215_CONSOLE)
196                        SET_CONSOLE_3215;
197#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
198                        SET_CONSOLE_SCLP;
199#endif
200                } else if (strncmp(ptr + 8, "3215", 4) == 0) {
201#if defined(CONFIG_TN3215_CONSOLE)
202                        SET_CONSOLE_3215;
203#elif defined(CONFIG_TN3270_CONSOLE)
204                        SET_CONSOLE_3270;
205#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
206                        SET_CONSOLE_SCLP;
207#endif
208                }
209        } else {
210#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
211                SET_CONSOLE_SCLP;
212#endif
213        }
214}
215
216#ifdef CONFIG_CRASH_DUMP
217static void __init setup_zfcpdump(void)
218{
219        if (ipl_info.type != IPL_TYPE_FCP_DUMP)
220                return;
221        if (OLDMEM_BASE)
222                return;
223        strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev");
224        console_loglevel = 2;
225}
226#else
227static inline void setup_zfcpdump(void) {}
228#endif /* CONFIG_CRASH_DUMP */
229
230 /*
231 * Reboot, halt and power_off stubs. They just call _machine_restart,
232 * _machine_halt or _machine_power_off.
233 */
234
235void machine_restart(char *command)
236{
237        if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
238                /*
239                 * Only unblank the console if we are called in enabled
240                 * context or a bust_spinlocks cleared the way for us.
241                 */
242                console_unblank();
243        _machine_restart(command);
244}
245
246void machine_halt(void)
247{
248        if (!in_interrupt() || oops_in_progress)
249                /*
250                 * Only unblank the console if we are called in enabled
251                 * context or a bust_spinlocks cleared the way for us.
252                 */
253                console_unblank();
254        _machine_halt();
255}
256
257void machine_power_off(void)
258{
259        if (!in_interrupt() || oops_in_progress)
260                /*
261                 * Only unblank the console if we are called in enabled
262                 * context or a bust_spinlocks cleared the way for us.
263                 */
264                console_unblank();
265        _machine_power_off();
266}
267
268/*
269 * Dummy power off function.
270 */
271void (*pm_power_off)(void) = machine_power_off;
272EXPORT_SYMBOL_GPL(pm_power_off);
273
274static int __init early_parse_mem(char *p)
275{
276        memory_end = memparse(p, &p);
277        memory_end &= PAGE_MASK;
278        memory_end_set = 1;
279        return 0;
280}
281early_param("mem", early_parse_mem);
282
283static int __init parse_vmalloc(char *arg)
284{
285        if (!arg)
286                return -EINVAL;
287        VMALLOC_END = (memparse(arg, &arg) + PAGE_SIZE - 1) & PAGE_MASK;
288        return 0;
289}
290early_param("vmalloc", parse_vmalloc);
291
292void *restart_stack __attribute__((__section__(".data")));
293
294static void __init setup_lowcore(void)
295{
296        struct _lowcore *lc;
297
298        /*
299         * Setup lowcore for boot cpu
300         */
301        BUILD_BUG_ON(sizeof(struct _lowcore) != LC_PAGES * 4096);
302        lc = __alloc_bootmem_low(LC_PAGES * PAGE_SIZE, LC_PAGES * PAGE_SIZE, 0);
303        lc->restart_psw.mask = PSW_KERNEL_BITS;
304        lc->restart_psw.addr =
305                PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
306        lc->external_new_psw.mask = PSW_KERNEL_BITS |
307                PSW_MASK_DAT | PSW_MASK_MCHECK;
308        lc->external_new_psw.addr =
309                PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
310        lc->svc_new_psw.mask = PSW_KERNEL_BITS |
311                PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
312        lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
313        lc->program_new_psw.mask = PSW_KERNEL_BITS |
314                PSW_MASK_DAT | PSW_MASK_MCHECK;
315        lc->program_new_psw.addr =
316                PSW_ADDR_AMODE | (unsigned long) pgm_check_handler;
317        lc->mcck_new_psw.mask = PSW_KERNEL_BITS;
318        lc->mcck_new_psw.addr =
319                PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
320        lc->io_new_psw.mask = PSW_KERNEL_BITS |
321                PSW_MASK_DAT | PSW_MASK_MCHECK;
322        lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
323        lc->clock_comparator = -1ULL;
324        lc->kernel_stack = ((unsigned long) &init_thread_union)
325                + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
326        lc->async_stack = (unsigned long)
327                __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0)
328                + ASYNC_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
329        lc->panic_stack = (unsigned long)
330                __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0)
331                + PAGE_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
332        lc->current_task = (unsigned long) init_thread_union.thread_info.task;
333        lc->thread_info = (unsigned long) &init_thread_union;
334        lc->machine_flags = S390_lowcore.machine_flags;
335        lc->stfl_fac_list = S390_lowcore.stfl_fac_list;
336        memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
337               MAX_FACILITY_BIT/8);
338#ifndef CONFIG_64BIT
339        if (MACHINE_HAS_IEEE) {
340                lc->extended_save_area_addr = (__u32)
341                        __alloc_bootmem_low(PAGE_SIZE, PAGE_SIZE, 0);
342                /* enable extended save area */
343                __ctl_set_bit(14, 29);
344        }
345#else
346        if (MACHINE_HAS_VX)
347                lc->vector_save_area_addr =
348                        (unsigned long) &lc->vector_save_area;
349        lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0];
350#endif
351        lc->sync_enter_timer = S390_lowcore.sync_enter_timer;
352        lc->async_enter_timer = S390_lowcore.async_enter_timer;
353        lc->exit_timer = S390_lowcore.exit_timer;
354        lc->user_timer = S390_lowcore.user_timer;
355        lc->system_timer = S390_lowcore.system_timer;
356        lc->steal_timer = S390_lowcore.steal_timer;
357        lc->last_update_timer = S390_lowcore.last_update_timer;
358        lc->last_update_clock = S390_lowcore.last_update_clock;
359        lc->ftrace_func = S390_lowcore.ftrace_func;
360
361        restart_stack = __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0);
362        restart_stack += ASYNC_SIZE;
363
364        /*
365         * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant
366         * restart data to the absolute zero lowcore. This is necessary if
367         * PSW restart is done on an offline CPU that has lowcore zero.
368         */
369        lc->restart_stack = (unsigned long) restart_stack;
370        lc->restart_fn = (unsigned long) do_restart;
371        lc->restart_data = 0;
372        lc->restart_source = -1UL;
373
374        /* Setup absolute zero lowcore */
375        mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack);
376        mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn);
377        mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data);
378        mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source);
379        mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw);
380
381#ifdef CONFIG_SMP
382        lc->spinlock_lockval = arch_spin_lockval(0);
383#endif
384
385        set_prefix((u32)(unsigned long) lc);
386        lowcore_ptr[0] = lc;
387}
388
389static struct resource code_resource = {
390        .name  = "Kernel code",
391        .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
392};
393
394static struct resource data_resource = {
395        .name = "Kernel data",
396        .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
397};
398
399static struct resource bss_resource = {
400        .name = "Kernel bss",
401        .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
402};
403
404static struct resource __initdata *standard_resources[] = {
405        &code_resource,
406        &data_resource,
407        &bss_resource,
408};
409
410static void __init setup_resources(void)
411{
412        struct resource *res, *std_res, *sub_res;
413        struct memblock_region *reg;
414        int j;
415
416        code_resource.start = (unsigned long) &_text;
417        code_resource.end = (unsigned long) &_etext - 1;
418        data_resource.start = (unsigned long) &_etext;
419        data_resource.end = (unsigned long) &_edata - 1;
420        bss_resource.start = (unsigned long) &__bss_start;
421        bss_resource.end = (unsigned long) &__bss_stop - 1;
422
423        for_each_memblock(memory, reg) {
424                res = alloc_bootmem_low(sizeof(*res));
425                res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
426
427                res->name = "System RAM";
428                res->start = reg->base;
429                res->end = reg->base + reg->size - 1;
430                request_resource(&iomem_resource, res);
431
432                for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
433                        std_res = standard_resources[j];
434                        if (std_res->start < res->start ||
435                            std_res->start > res->end)
436                                continue;
437                        if (std_res->end > res->end) {
438                                sub_res = alloc_bootmem_low(sizeof(*sub_res));
439                                *sub_res = *std_res;
440                                sub_res->end = res->end;
441                                std_res->start = res->end + 1;
442                                request_resource(res, sub_res);
443                        } else {
444                                request_resource(res, std_res);
445                        }
446                }
447        }
448}
449
450static void __init setup_memory_end(void)
451{
452        unsigned long vmax, vmalloc_size, tmp;
453
454        /* Choose kernel address space layout: 2, 3, or 4 levels. */
455#ifdef CONFIG_64BIT
456        vmalloc_size = VMALLOC_END ?: (128UL << 30) - MODULES_LEN;
457        tmp = (memory_end ?: max_physmem_end) / PAGE_SIZE;
458        tmp = tmp * (sizeof(struct page) + PAGE_SIZE);
459        if (tmp + vmalloc_size + MODULES_LEN <= (1UL << 42))
460                vmax = 1UL << 42;       /* 3-level kernel page table */
461        else
462                vmax = 1UL << 53;       /* 4-level kernel page table */
463        /* module area is at the end of the kernel address space. */
464        MODULES_END = vmax;
465        MODULES_VADDR = MODULES_END - MODULES_LEN;
466        VMALLOC_END = MODULES_VADDR;
467#else
468        vmalloc_size = VMALLOC_END ?: 96UL << 20;
469        vmax = 1UL << 31;               /* 2-level kernel page table */
470        /* vmalloc area is at the end of the kernel address space. */
471        VMALLOC_END = vmax;
472#endif
473        VMALLOC_START = vmax - vmalloc_size;
474
475        /* Split remaining virtual space between 1:1 mapping & vmemmap array */
476        tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page));
477        /* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */
478        tmp = SECTION_ALIGN_UP(tmp);
479        tmp = VMALLOC_START - tmp * sizeof(struct page);
480        tmp &= ~((vmax >> 11) - 1);     /* align to page table level */
481        tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS);
482        vmemmap = (struct page *) tmp;
483
484        /* Take care that memory_end is set and <= vmemmap */
485        memory_end = min(memory_end ?: max_physmem_end, tmp);
486        max_pfn = max_low_pfn = PFN_DOWN(memory_end);
487        memblock_remove(memory_end, ULONG_MAX);
488
489        pr_notice("Max memory size: %luMB\n", memory_end >> 20);
490}
491
492static void __init setup_vmcoreinfo(void)
493{
494        mem_assign_absolute(S390_lowcore.vmcore_info, paddr_vmcoreinfo_note());
495}
496
497#ifdef CONFIG_CRASH_DUMP
498
499/*
500 * When kdump is enabled, we have to ensure that no memory from
501 * the area [0 - crashkernel memory size] and
502 * [crashk_res.start - crashk_res.end] is set offline.
503 */
504static int kdump_mem_notifier(struct notifier_block *nb,
505                              unsigned long action, void *data)
506{
507        struct memory_notify *arg = data;
508
509        if (action != MEM_GOING_OFFLINE)
510                return NOTIFY_OK;
511        if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
512                return NOTIFY_BAD;
513        if (arg->start_pfn > PFN_DOWN(crashk_res.end))
514                return NOTIFY_OK;
515        if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start))
516                return NOTIFY_OK;
517        return NOTIFY_BAD;
518}
519
520static struct notifier_block kdump_mem_nb = {
521        .notifier_call = kdump_mem_notifier,
522};
523
524#endif
525
526/*
527 * Make sure that the area behind memory_end is protected
528 */
529static void reserve_memory_end(void)
530{
531#ifdef CONFIG_CRASH_DUMP
532        if (ipl_info.type == IPL_TYPE_FCP_DUMP &&
533            !OLDMEM_BASE && sclp_get_hsa_size()) {
534                memory_end = sclp_get_hsa_size();
535                memory_end &= PAGE_MASK;
536                memory_end_set = 1;
537        }
538#endif
539        if (!memory_end_set)
540                return;
541        memblock_reserve(memory_end, ULONG_MAX);
542}
543
544/*
545 * Make sure that oldmem, where the dump is stored, is protected
546 */
547static void reserve_oldmem(void)
548{
549#ifdef CONFIG_CRASH_DUMP
550        if (OLDMEM_BASE)
551                /* Forget all memory above the running kdump system */
552                memblock_reserve(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX);
553#endif
554}
555
556/*
557 * Make sure that oldmem, where the dump is stored, is protected
558 */
559static void remove_oldmem(void)
560{
561#ifdef CONFIG_CRASH_DUMP
562        if (OLDMEM_BASE)
563                /* Forget all memory above the running kdump system */
564                memblock_remove(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX);
565#endif
566}
567
568/*
569 * Reserve memory for kdump kernel to be loaded with kexec
570 */
571static void __init reserve_crashkernel(void)
572{
573#ifdef CONFIG_CRASH_DUMP
574        unsigned long long crash_base, crash_size;
575        phys_addr_t low, high;
576        int rc;
577
578        rc = parse_crashkernel(boot_command_line, memory_end, &crash_size,
579                               &crash_base);
580
581        crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
582        crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
583        if (rc || crash_size == 0)
584                return;
585
586        if (memblock.memory.regions[0].size < crash_size) {
587                pr_info("crashkernel reservation failed: %s\n",
588                        "first memory chunk must be at least crashkernel size");
589                return;
590        }
591
592        low = crash_base ?: OLDMEM_BASE;
593        high = low + crash_size;
594        if (low >= OLDMEM_BASE && high <= OLDMEM_BASE + OLDMEM_SIZE) {
595                /* The crashkernel fits into OLDMEM, reuse OLDMEM */
596                crash_base = low;
597        } else {
598                /* Find suitable area in free memory */
599                low = max_t(unsigned long, crash_size, sclp_get_hsa_size());
600                high = crash_base ? crash_base + crash_size : ULONG_MAX;
601
602                if (crash_base && crash_base < low) {
603                        pr_info("crashkernel reservation failed: %s\n",
604                                "crash_base too low");
605                        return;
606                }
607                low = crash_base ?: low;
608                crash_base = memblock_find_in_range(low, high, crash_size,
609                                                    KEXEC_CRASH_MEM_ALIGN);
610        }
611
612        if (!crash_base) {
613                pr_info("crashkernel reservation failed: %s\n",
614                        "no suitable area found");
615                return;
616        }
617
618        if (register_memory_notifier(&kdump_mem_nb))
619                return;
620
621        if (!OLDMEM_BASE && MACHINE_IS_VM)
622                diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
623        crashk_res.start = crash_base;
624        crashk_res.end = crash_base + crash_size - 1;
625        insert_resource(&iomem_resource, &crashk_res);
626        memblock_remove(crash_base, crash_size);
627        pr_info("Reserving %lluMB of memory at %lluMB "
628                "for crashkernel (System RAM: %luMB)\n",
629                crash_size >> 20, crash_base >> 20,
630                (unsigned long)memblock.memory.total_size >> 20);
631        os_info_crashkernel_add(crash_base, crash_size);
632#endif
633}
634
635/*
636 * Reserve the initrd from being used by memblock
637 */
638static void __init reserve_initrd(void)
639{
640#ifdef CONFIG_BLK_DEV_INITRD
641        initrd_start = INITRD_START;
642        initrd_end = initrd_start + INITRD_SIZE;
643        memblock_reserve(INITRD_START, INITRD_SIZE);
644#endif
645}
646
647/*
648 * Check for initrd being in usable memory
649 */
650static void __init check_initrd(void)
651{
652#ifdef CONFIG_BLK_DEV_INITRD
653        if (INITRD_START && INITRD_SIZE &&
654            !memblock_is_region_memory(INITRD_START, INITRD_SIZE)) {
655                pr_err("initrd does not fit memory.\n");
656                memblock_free(INITRD_START, INITRD_SIZE);
657                initrd_start = initrd_end = 0;
658        }
659#endif
660}
661
662/*
663 * Reserve all kernel text
664 */
665static void __init reserve_kernel(void)
666{
667        unsigned long start_pfn;
668        start_pfn = PFN_UP(__pa(&_end));
669
670        /*
671         * Reserve memory used for lowcore/command line/kernel image.
672         */
673        memblock_reserve(0, (unsigned long)_ehead);
674        memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn)
675                         - (unsigned long)_stext);
676}
677
678static void __init reserve_elfcorehdr(void)
679{
680#ifdef CONFIG_CRASH_DUMP
681        if (is_kdump_kernel())
682                memblock_reserve(elfcorehdr_addr - OLDMEM_BASE,
683                                 PAGE_ALIGN(elfcorehdr_size));
684#endif
685}
686
687static void __init setup_memory(void)
688{
689        struct memblock_region *reg;
690
691        /*
692         * Init storage key for present memory
693         */
694        for_each_memblock(memory, reg) {
695                storage_key_init_range(reg->base, reg->base + reg->size);
696        }
697        psw_set_key(PAGE_DEFAULT_KEY);
698
699        /* Only cosmetics */
700        memblock_enforce_memory_limit(memblock_end_of_DRAM());
701}
702
703/*
704 * Setup hardware capabilities.
705 */
706static void __init setup_hwcaps(void)
707{
708        static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
709        struct cpuid cpu_id;
710        int i;
711
712        /*
713         * The store facility list bits numbers as found in the principles
714         * of operation are numbered with bit 1UL<<31 as number 0 to
715         * bit 1UL<<0 as number 31.
716         *   Bit 0: instructions named N3, "backported" to esa-mode
717         *   Bit 2: z/Architecture mode is active
718         *   Bit 7: the store-facility-list-extended facility is installed
719         *   Bit 17: the message-security assist is installed
720         *   Bit 19: the long-displacement facility is installed
721         *   Bit 21: the extended-immediate facility is installed
722         *   Bit 22: extended-translation facility 3 is installed
723         *   Bit 30: extended-translation facility 3 enhancement facility
724         * These get translated to:
725         *   HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
726         *   HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
727         *   HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
728         *   HWCAP_S390_ETF3EH bit 8 (22 && 30).
729         */
730        for (i = 0; i < 6; i++)
731                if (test_facility(stfl_bits[i]))
732                        elf_hwcap |= 1UL << i;
733
734        if (test_facility(22) && test_facility(30))
735                elf_hwcap |= HWCAP_S390_ETF3EH;
736
737        /*
738         * Check for additional facilities with store-facility-list-extended.
739         * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
740         * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
741         * as stored by stfl, bits 32-xxx contain additional facilities.
742         * How many facility words are stored depends on the number of
743         * doublewords passed to the instruction. The additional facilities
744         * are:
745         *   Bit 42: decimal floating point facility is installed
746         *   Bit 44: perform floating point operation facility is installed
747         * translated to:
748         *   HWCAP_S390_DFP bit 6 (42 && 44).
749         */
750        if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
751                elf_hwcap |= HWCAP_S390_DFP;
752
753        /*
754         * Huge page support HWCAP_S390_HPAGE is bit 7.
755         */
756        if (MACHINE_HAS_HPAGE)
757                elf_hwcap |= HWCAP_S390_HPAGE;
758
759#if defined(CONFIG_64BIT)
760        /*
761         * 64-bit register support for 31-bit processes
762         * HWCAP_S390_HIGH_GPRS is bit 9.
763         */
764        elf_hwcap |= HWCAP_S390_HIGH_GPRS;
765
766        /*
767         * Transactional execution support HWCAP_S390_TE is bit 10.
768         */
769        if (test_facility(50) && test_facility(73))
770                elf_hwcap |= HWCAP_S390_TE;
771
772        /*
773         * Vector extension HWCAP_S390_VXRS is bit 11.
774         */
775        if (test_facility(129))
776                elf_hwcap |= HWCAP_S390_VXRS;
777#endif
778
779        get_cpu_id(&cpu_id);
780        add_device_randomness(&cpu_id, sizeof(cpu_id));
781        switch (cpu_id.machine) {
782        case 0x9672:
783#if !defined(CONFIG_64BIT)
784        default:        /* Use "g5" as default for 31 bit kernels. */
785#endif
786                strcpy(elf_platform, "g5");
787                break;
788        case 0x2064:
789        case 0x2066:
790#if defined(CONFIG_64BIT)
791        default:        /* Use "z900" as default for 64 bit kernels. */
792#endif
793                strcpy(elf_platform, "z900");
794                break;
795        case 0x2084:
796        case 0x2086:
797                strcpy(elf_platform, "z990");
798                break;
799        case 0x2094:
800        case 0x2096:
801                strcpy(elf_platform, "z9-109");
802                break;
803        case 0x2097:
804        case 0x2098:
805                strcpy(elf_platform, "z10");
806                break;
807        case 0x2817:
808        case 0x2818:
809                strcpy(elf_platform, "z196");
810                break;
811        case 0x2827:
812        case 0x2828:
813                strcpy(elf_platform, "zEC12");
814                break;
815        }
816}
817
818/*
819 * Add system information as device randomness
820 */
821static void __init setup_randomness(void)
822{
823        struct sysinfo_3_2_2 *vmms;
824
825        vmms = (struct sysinfo_3_2_2 *) memblock_alloc(PAGE_SIZE, PAGE_SIZE);
826        if (stsi(vmms, 3, 2, 2) == 0 && vmms->count)
827                add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count);
828        memblock_free((unsigned long) vmms, PAGE_SIZE);
829}
830
831/*
832 * Setup function called from init/main.c just after the banner
833 * was printed.
834 */
835
836void __init setup_arch(char **cmdline_p)
837{
838        /*
839         * print what head.S has found out about the machine
840         */
841#ifndef CONFIG_64BIT
842        if (MACHINE_IS_VM)
843                pr_info("Linux is running as a z/VM "
844                        "guest operating system in 31-bit mode\n");
845        else if (MACHINE_IS_LPAR)
846                pr_info("Linux is running natively in 31-bit mode\n");
847        if (MACHINE_HAS_IEEE)
848                pr_info("The hardware system has IEEE compatible "
849                        "floating point units\n");
850        else
851                pr_info("The hardware system has no IEEE compatible "
852                        "floating point units\n");
853#else /* CONFIG_64BIT */
854        if (MACHINE_IS_VM)
855                pr_info("Linux is running as a z/VM "
856                        "guest operating system in 64-bit mode\n");
857        else if (MACHINE_IS_KVM)
858                pr_info("Linux is running under KVM in 64-bit mode\n");
859        else if (MACHINE_IS_LPAR)
860                pr_info("Linux is running natively in 64-bit mode\n");
861#endif /* CONFIG_64BIT */
862
863        /* Have one command line that is parsed and saved in /proc/cmdline */
864        /* boot_command_line has been already set up in early.c */
865        *cmdline_p = boot_command_line;
866
867        ROOT_DEV = Root_RAM0;
868
869        /* Is init_mm really needed? */
870        init_mm.start_code = PAGE_OFFSET;
871        init_mm.end_code = (unsigned long) &_etext;
872        init_mm.end_data = (unsigned long) &_edata;
873        init_mm.brk = (unsigned long) &_end;
874
875        parse_early_param();
876        os_info_init();
877        setup_ipl();
878
879        /* Do some memory reservations *before* memory is added to memblock */
880        reserve_memory_end();
881        reserve_oldmem();
882        reserve_kernel();
883        reserve_initrd();
884        reserve_elfcorehdr();
885        memblock_allow_resize();
886
887        /* Get information about *all* installed memory */
888        detect_memory_memblock();
889
890        remove_oldmem();
891
892        /*
893         * Make sure all chunks are MAX_ORDER aligned so we don't need the
894         * extra checks that HOLES_IN_ZONE would require.
895         *
896         * Is this still required?
897         */
898        memblock_trim_memory(1UL << (MAX_ORDER - 1 + PAGE_SHIFT));
899
900        setup_memory_end();
901        setup_memory();
902
903        check_initrd();
904        reserve_crashkernel();
905
906        setup_resources();
907        setup_vmcoreinfo();
908        setup_lowcore();
909        smp_fill_possible_mask();
910        cpu_init();
911        s390_init_cpu_topology();
912
913        /*
914         * Setup capabilities (ELF_HWCAP & ELF_PLATFORM).
915         */
916        setup_hwcaps();
917
918        /*
919         * Create kernel page tables and switch to virtual addressing.
920         */
921        paging_init();
922
923        /* Setup default console */
924        conmode_default();
925        set_preferred_console();
926
927        /* Setup zfcpdump support */
928        setup_zfcpdump();
929
930        /* Add system specific data to the random pool */
931        setup_randomness();
932}
933
934#ifdef CONFIG_32BIT
935static int no_removal_warning __initdata;
936
937static int __init parse_no_removal_warning(char *str)
938{
939        no_removal_warning = 1;
940        return 0;
941}
942__setup("no_removal_warning", parse_no_removal_warning);
943
944static int __init removal_warning(void)
945{
946        if (no_removal_warning)
947                return 0;
948        printk(KERN_ALERT "\n\n");
949        printk(KERN_CONT "Warning - you are using a 31 bit kernel!\n\n");
950        printk(KERN_CONT "We plan to remove 31 bit kernel support from the kernel sources in March 2015.\n");
951        printk(KERN_CONT "Currently we assume that nobody is using the 31 bit kernel on old 31 bit\n");
952        printk(KERN_CONT "hardware anymore. If you think that the code should not be removed and also\n");
953        printk(KERN_CONT "future versions of the Linux kernel should be able to run in 31 bit mode\n");
954        printk(KERN_CONT "please let us know. Please write to:\n");
955        printk(KERN_CONT "linux390@de.ibm.com (mail address) and/or\n");
956        printk(KERN_CONT "linux-s390@vger.kernel.org (mailing list).\n\n");
957        printk(KERN_CONT "Thank you!\n\n");
958        printk(KERN_CONT "If this kernel runs on a 64 bit machine you may consider using a 64 bit kernel.\n");
959        printk(KERN_CONT "This message can be disabled with the \"no_removal_warning\" kernel parameter.\n");
960        schedule_timeout_uninterruptible(300 * HZ);
961        return 0;
962}
963early_initcall(removal_warning);
964#endif
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