source: src/linux/universal/linux-4.9/arch/s390/kernel/setup.c @ 31662

Last change on this file since 31662 was 31662, checked in by brainslayer, 6 weeks ago

use new squashfs in all kernels

File size: 25.0 KB
Line 
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/kexec.h>
45#include <linux/crash_dump.h>
46#include <linux/memory.h>
47#include <linux/compat.h>
48
49#include <asm/ipl.h>
50#include <asm/facility.h>
51#include <asm/smp.h>
52#include <asm/mmu_context.h>
53#include <asm/cpcmd.h>
54#include <asm/lowcore.h>
55#include <asm/irq.h>
56#include <asm/page.h>
57#include <asm/ptrace.h>
58#include <asm/sections.h>
59#include <asm/ebcdic.h>
60#include <asm/kvm_virtio.h>
61#include <asm/diag.h>
62#include <asm/os_info.h>
63#include <asm/sclp.h>
64#include <asm/sysinfo.h>
65#include <asm/numa.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 __read_mostly = 0;
81char elf_platform[ELF_PLATFORM_SIZE];
82
83unsigned long int_hwcap = 0;
84
85int __initdata memory_end_set;
86unsigned long __initdata memory_end;
87unsigned long __initdata max_physmem_end;
88
89unsigned long VMALLOC_START;
90EXPORT_SYMBOL(VMALLOC_START);
91
92unsigned long VMALLOC_END;
93EXPORT_SYMBOL(VMALLOC_END);
94
95struct page *vmemmap;
96EXPORT_SYMBOL(vmemmap);
97
98unsigned long MODULES_VADDR;
99unsigned long MODULES_END;
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 (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
134                add_preferred_console("ttyS", 0, NULL);
135        else if (CONSOLE_IS_3270)
136                add_preferred_console("tty3270", 0, NULL);
137        else if (CONSOLE_IS_VT220)
138                add_preferred_console("ttyS", 1, NULL);
139        else if (CONSOLE_IS_HVC)
140                add_preferred_console("hvc", 0, NULL);
141}
142
143static int __init conmode_setup(char *str)
144{
145#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
146        if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
147                SET_CONSOLE_SCLP;
148#endif
149#if defined(CONFIG_TN3215_CONSOLE)
150        if (strncmp(str, "3215", 5) == 0)
151                SET_CONSOLE_3215;
152#endif
153#if defined(CONFIG_TN3270_CONSOLE)
154        if (strncmp(str, "3270", 5) == 0)
155                SET_CONSOLE_3270;
156#endif
157        set_preferred_console();
158        return 1;
159}
160
161__setup("conmode=", conmode_setup);
162
163static void __init conmode_default(void)
164{
165        char query_buffer[1024];
166        char *ptr;
167
168        if (MACHINE_IS_VM) {
169                cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
170                console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
171                ptr = strstr(query_buffer, "SUBCHANNEL =");
172                console_irq = simple_strtoul(ptr + 13, NULL, 16);
173                cpcmd("QUERY TERM", query_buffer, 1024, NULL);
174                ptr = strstr(query_buffer, "CONMODE");
175                /*
176                 * Set the conmode to 3215 so that the device recognition
177                 * will set the cu_type of the console to 3215. If the
178                 * conmode is 3270 and we don't set it back then both
179                 * 3215 and the 3270 driver will try to access the console
180                 * device (3215 as console and 3270 as normal tty).
181                 */
182                cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
183                if (ptr == NULL) {
184#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
185                        SET_CONSOLE_SCLP;
186#endif
187                        return;
188                }
189                if (strncmp(ptr + 8, "3270", 4) == 0) {
190#if defined(CONFIG_TN3270_CONSOLE)
191                        SET_CONSOLE_3270;
192#elif defined(CONFIG_TN3215_CONSOLE)
193                        SET_CONSOLE_3215;
194#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
195                        SET_CONSOLE_SCLP;
196#endif
197                } else if (strncmp(ptr + 8, "3215", 4) == 0) {
198#if defined(CONFIG_TN3215_CONSOLE)
199                        SET_CONSOLE_3215;
200#elif defined(CONFIG_TN3270_CONSOLE)
201                        SET_CONSOLE_3270;
202#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
203                        SET_CONSOLE_SCLP;
204#endif
205                }
206        } else if (MACHINE_IS_KVM) {
207                if (sclp.has_vt220 && IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE))
208                        SET_CONSOLE_VT220;
209                else if (sclp.has_linemode && IS_ENABLED(CONFIG_SCLP_CONSOLE))
210                        SET_CONSOLE_SCLP;
211                else
212                        SET_CONSOLE_HVC;
213        } else {
214#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
215                SET_CONSOLE_SCLP;
216#endif
217        }
218}
219
220#ifdef CONFIG_CRASH_DUMP
221static void __init setup_zfcpdump(void)
222{
223        if (ipl_info.type != IPL_TYPE_FCP_DUMP)
224                return;
225        if (OLDMEM_BASE)
226                return;
227        strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev");
228        console_loglevel = 2;
229}
230#else
231static inline void setup_zfcpdump(void) {}
232#endif /* CONFIG_CRASH_DUMP */
233
234 /*
235 * Reboot, halt and power_off stubs. They just call _machine_restart,
236 * _machine_halt or _machine_power_off.
237 */
238
239void machine_restart(char *command)
240{
241        if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
242                /*
243                 * Only unblank the console if we are called in enabled
244                 * context or a bust_spinlocks cleared the way for us.
245                 */
246                console_unblank();
247        _machine_restart(command);
248}
249
250void machine_halt(void)
251{
252        if (!in_interrupt() || oops_in_progress)
253                /*
254                 * Only unblank the console if we are called in enabled
255                 * context or a bust_spinlocks cleared the way for us.
256                 */
257                console_unblank();
258        _machine_halt();
259}
260
261void machine_power_off(void)
262{
263        if (!in_interrupt() || oops_in_progress)
264                /*
265                 * Only unblank the console if we are called in enabled
266                 * context or a bust_spinlocks cleared the way for us.
267                 */
268                console_unblank();
269        _machine_power_off();
270}
271
272/*
273 * Dummy power off function.
274 */
275void (*pm_power_off)(void) = machine_power_off;
276EXPORT_SYMBOL_GPL(pm_power_off);
277
278static int __init early_parse_mem(char *p)
279{
280        memory_end = memparse(p, &p);
281        memory_end &= PAGE_MASK;
282        memory_end_set = 1;
283        return 0;
284}
285early_param("mem", early_parse_mem);
286
287static int __init parse_vmalloc(char *arg)
288{
289        if (!arg)
290                return -EINVAL;
291        VMALLOC_END = (memparse(arg, &arg) + PAGE_SIZE - 1) & PAGE_MASK;
292        return 0;
293}
294early_param("vmalloc", parse_vmalloc);
295
296void *restart_stack __section(.data);
297
298static void __init setup_lowcore(void)
299{
300        struct lowcore *lc;
301
302        /*
303         * Setup lowcore for boot cpu
304         */
305        BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * 4096);
306        lc = __alloc_bootmem_low(LC_PAGES * PAGE_SIZE, LC_PAGES * PAGE_SIZE, 0);
307        lc->restart_psw.mask = PSW_KERNEL_BITS;
308        lc->restart_psw.addr = (unsigned long) restart_int_handler;
309        lc->external_new_psw.mask = PSW_KERNEL_BITS |
310                PSW_MASK_DAT | PSW_MASK_MCHECK;
311        lc->external_new_psw.addr = (unsigned long) ext_int_handler;
312        lc->svc_new_psw.mask = PSW_KERNEL_BITS |
313                PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
314        lc->svc_new_psw.addr = (unsigned long) system_call;
315        lc->program_new_psw.mask = PSW_KERNEL_BITS |
316                PSW_MASK_DAT | PSW_MASK_MCHECK;
317        lc->program_new_psw.addr = (unsigned long) pgm_check_handler;
318        lc->mcck_new_psw.mask = PSW_KERNEL_BITS;
319        lc->mcck_new_psw.addr = (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 = (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->lpp = LPP_MAGIC;
335        lc->machine_flags = S390_lowcore.machine_flags;
336        lc->stfl_fac_list = S390_lowcore.stfl_fac_list;
337        memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
338               MAX_FACILITY_BIT/8);
339        if (MACHINE_HAS_VX)
340                lc->vector_save_area_addr =
341                        (unsigned long) &lc->vector_save_area;
342        lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0];
343        lc->sync_enter_timer = S390_lowcore.sync_enter_timer;
344        lc->async_enter_timer = S390_lowcore.async_enter_timer;
345        lc->exit_timer = S390_lowcore.exit_timer;
346        lc->user_timer = S390_lowcore.user_timer;
347        lc->system_timer = S390_lowcore.system_timer;
348        lc->steal_timer = S390_lowcore.steal_timer;
349        lc->last_update_timer = S390_lowcore.last_update_timer;
350        lc->last_update_clock = S390_lowcore.last_update_clock;
351
352        restart_stack = __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0);
353        restart_stack += ASYNC_SIZE;
354
355        /*
356         * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant
357         * restart data to the absolute zero lowcore. This is necessary if
358         * PSW restart is done on an offline CPU that has lowcore zero.
359         */
360        lc->restart_stack = (unsigned long) restart_stack;
361        lc->restart_fn = (unsigned long) do_restart;
362        lc->restart_data = 0;
363        lc->restart_source = -1UL;
364
365        /* Setup absolute zero lowcore */
366        mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack);
367        mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn);
368        mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data);
369        mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source);
370        mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw);
371
372#ifdef CONFIG_SMP
373        lc->spinlock_lockval = arch_spin_lockval(0);
374#endif
375
376        set_prefix((u32)(unsigned long) lc);
377        lowcore_ptr[0] = lc;
378}
379
380static struct resource code_resource = {
381        .name  = "Kernel code",
382        .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
383};
384
385static struct resource data_resource = {
386        .name = "Kernel data",
387        .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
388};
389
390static struct resource bss_resource = {
391        .name = "Kernel bss",
392        .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
393};
394
395static struct resource __initdata *standard_resources[] = {
396        &code_resource,
397        &data_resource,
398        &bss_resource,
399};
400
401static void __init setup_resources(void)
402{
403        struct resource *res, *std_res, *sub_res;
404        struct memblock_region *reg;
405        int j;
406
407        code_resource.start = (unsigned long) &_text;
408        code_resource.end = (unsigned long) &_etext - 1;
409        data_resource.start = (unsigned long) &_etext;
410        data_resource.end = (unsigned long) &_edata - 1;
411        bss_resource.start = (unsigned long) &__bss_start;
412        bss_resource.end = (unsigned long) &__bss_stop - 1;
413
414        for_each_memblock(memory, reg) {
415                res = alloc_bootmem_low(sizeof(*res));
416                res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM;
417
418                res->name = "System RAM";
419                res->start = reg->base;
420                res->end = reg->base + reg->size - 1;
421                request_resource(&iomem_resource, res);
422
423                for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
424                        std_res = standard_resources[j];
425                        if (std_res->start < res->start ||
426                            std_res->start > res->end)
427                                continue;
428                        if (std_res->end > res->end) {
429                                sub_res = alloc_bootmem_low(sizeof(*sub_res));
430                                *sub_res = *std_res;
431                                sub_res->end = res->end;
432                                std_res->start = res->end + 1;
433                                request_resource(res, sub_res);
434                        } else {
435                                request_resource(res, std_res);
436                        }
437                }
438        }
439#ifdef CONFIG_CRASH_DUMP
440        /*
441         * Re-add removed crash kernel memory as reserved memory. This makes
442         * sure it will be mapped with the identity mapping and struct pages
443         * will be created, so it can be resized later on.
444         * However add it later since the crash kernel resource should not be
445         * part of the System RAM resource.
446         */
447        if (crashk_res.end) {
448                memblock_add_node(crashk_res.start, resource_size(&crashk_res), 0);
449                memblock_reserve(crashk_res.start, resource_size(&crashk_res));
450                insert_resource(&iomem_resource, &crashk_res);
451        }
452#endif
453}
454
455static void __init setup_memory_end(void)
456{
457        unsigned long vmax, vmalloc_size, tmp;
458
459        /* Choose kernel address space layout: 2, 3, or 4 levels. */
460        vmalloc_size = VMALLOC_END ?: (128UL << 30) - MODULES_LEN;
461        tmp = (memory_end ?: max_physmem_end) / PAGE_SIZE;
462        tmp = tmp * (sizeof(struct page) + PAGE_SIZE);
463        if (tmp + vmalloc_size + MODULES_LEN <= (1UL << 42))
464                vmax = 1UL << 42;       /* 3-level kernel page table */
465        else
466                vmax = 1UL << 53;       /* 4-level kernel page table */
467        /* module area is at the end of the kernel address space. */
468        MODULES_END = vmax;
469        MODULES_VADDR = MODULES_END - MODULES_LEN;
470        VMALLOC_END = MODULES_VADDR;
471        VMALLOC_START = vmax - vmalloc_size;
472
473        /* Split remaining virtual space between 1:1 mapping & vmemmap array */
474        tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page));
475        /* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */
476        tmp = SECTION_ALIGN_UP(tmp);
477        tmp = VMALLOC_START - tmp * sizeof(struct page);
478        tmp &= ~((vmax >> 11) - 1);     /* align to page table level */
479        tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS);
480        vmemmap = (struct page *) tmp;
481
482        /* Take care that memory_end is set and <= vmemmap */
483        memory_end = min(memory_end ?: max_physmem_end, tmp);
484        max_pfn = max_low_pfn = PFN_DOWN(memory_end);
485        memblock_remove(memory_end, ULONG_MAX);
486
487        pr_notice("Max memory size: %luMB\n", memory_end >> 20);
488}
489
490static void __init setup_vmcoreinfo(void)
491{
492        mem_assign_absolute(S390_lowcore.vmcore_info, paddr_vmcoreinfo_note());
493}
494
495#ifdef CONFIG_CRASH_DUMP
496
497/*
498 * When kdump is enabled, we have to ensure that no memory from
499 * the area [0 - crashkernel memory size] and
500 * [crashk_res.start - crashk_res.end] is set offline.
501 */
502static int kdump_mem_notifier(struct notifier_block *nb,
503                              unsigned long action, void *data)
504{
505        struct memory_notify *arg = data;
506
507        if (action != MEM_GOING_OFFLINE)
508                return NOTIFY_OK;
509        if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
510                return NOTIFY_BAD;
511        if (arg->start_pfn > PFN_DOWN(crashk_res.end))
512                return NOTIFY_OK;
513        if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start))
514                return NOTIFY_OK;
515        return NOTIFY_BAD;
516}
517
518static struct notifier_block kdump_mem_nb = {
519        .notifier_call = kdump_mem_notifier,
520};
521
522#endif
523
524/*
525 * Make sure that the area behind memory_end is protected
526 */
527static void reserve_memory_end(void)
528{
529#ifdef CONFIG_CRASH_DUMP
530        if (ipl_info.type == IPL_TYPE_FCP_DUMP &&
531            !OLDMEM_BASE && sclp.hsa_size) {
532                memory_end = sclp.hsa_size;
533                memory_end &= PAGE_MASK;
534                memory_end_set = 1;
535        }
536#endif
537        if (!memory_end_set)
538                return;
539        memblock_reserve(memory_end, ULONG_MAX);
540}
541
542/*
543 * Make sure that oldmem, where the dump is stored, is protected
544 */
545static void reserve_oldmem(void)
546{
547#ifdef CONFIG_CRASH_DUMP
548        if (OLDMEM_BASE)
549                /* Forget all memory above the running kdump system */
550                memblock_reserve(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX);
551#endif
552}
553
554/*
555 * Make sure that oldmem, where the dump is stored, is protected
556 */
557static void remove_oldmem(void)
558{
559#ifdef CONFIG_CRASH_DUMP
560        if (OLDMEM_BASE)
561                /* Forget all memory above the running kdump system */
562                memblock_remove(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX);
563#endif
564}
565
566/*
567 * Reserve memory for kdump kernel to be loaded with kexec
568 */
569static void __init reserve_crashkernel(void)
570{
571#ifdef CONFIG_CRASH_DUMP
572        unsigned long long crash_base, crash_size;
573        phys_addr_t low, high;
574        int rc;
575
576        rc = parse_crashkernel(boot_command_line, memory_end, &crash_size,
577                               &crash_base);
578
579        crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
580        crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
581        if (rc || crash_size == 0)
582                return;
583
584        if (memblock.memory.regions[0].size < crash_size) {
585                pr_info("crashkernel reservation failed: %s\n",
586                        "first memory chunk must be at least crashkernel size");
587                return;
588        }
589
590        low = crash_base ?: OLDMEM_BASE;
591        high = low + crash_size;
592        if (low >= OLDMEM_BASE && high <= OLDMEM_BASE + OLDMEM_SIZE) {
593                /* The crashkernel fits into OLDMEM, reuse OLDMEM */
594                crash_base = low;
595        } else {
596                /* Find suitable area in free memory */
597                low = max_t(unsigned long, crash_size, sclp.hsa_size);
598                high = crash_base ? crash_base + crash_size : ULONG_MAX;
599
600                if (crash_base && crash_base < low) {
601                        pr_info("crashkernel reservation failed: %s\n",
602                                "crash_base too low");
603                        return;
604                }
605                low = crash_base ?: low;
606                crash_base = memblock_find_in_range(low, high, crash_size,
607                                                    KEXEC_CRASH_MEM_ALIGN);
608        }
609
610        if (!crash_base) {
611                pr_info("crashkernel reservation failed: %s\n",
612                        "no suitable area found");
613                return;
614        }
615
616        if (register_memory_notifier(&kdump_mem_nb))
617                return;
618
619        if (!OLDMEM_BASE && MACHINE_IS_VM)
620                diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
621        crashk_res.start = crash_base;
622        crashk_res.end = crash_base + crash_size - 1;
623        memblock_remove(crash_base, crash_size);
624        pr_info("Reserving %lluMB of memory at %lluMB "
625                "for crashkernel (System RAM: %luMB)\n",
626                crash_size >> 20, crash_base >> 20,
627                (unsigned long)memblock.memory.total_size >> 20);
628        os_info_crashkernel_add(crash_base, crash_size);
629#endif
630}
631
632/*
633 * Reserve the initrd from being used by memblock
634 */
635static void __init reserve_initrd(void)
636{
637#ifdef CONFIG_BLK_DEV_INITRD
638        initrd_start = INITRD_START;
639        initrd_end = initrd_start + INITRD_SIZE;
640        memblock_reserve(INITRD_START, INITRD_SIZE);
641#endif
642}
643
644/*
645 * Check for initrd being in usable memory
646 */
647static void __init check_initrd(void)
648{
649#ifdef CONFIG_BLK_DEV_INITRD
650        if (INITRD_START && INITRD_SIZE &&
651            !memblock_is_region_memory(INITRD_START, INITRD_SIZE)) {
652                pr_err("initrd does not fit memory.\n");
653                memblock_free(INITRD_START, INITRD_SIZE);
654                initrd_start = initrd_end = 0;
655        }
656#endif
657}
658
659/*
660 * Reserve memory used for lowcore/command line/kernel image.
661 */
662static void __init reserve_kernel(void)
663{
664        unsigned long start_pfn = PFN_UP(__pa(&_end));
665
666#ifdef CONFIG_DMA_API_DEBUG
667        /*
668         * DMA_API_DEBUG code stumbles over addresses from the
669         * range [_ehead, _stext]. Mark the memory as reserved
670         * so it is not used for CONFIG_DMA_API_DEBUG=y.
671         */
672        memblock_reserve(0, PFN_PHYS(start_pfn));
673#else
674        memblock_reserve(0, (unsigned long)_ehead);
675        memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn)
676                         - (unsigned long)_stext);
677#endif
678}
679
680static void __init setup_memory(void)
681{
682        struct memblock_region *reg;
683
684        /*
685         * Init storage key for present memory
686         */
687        for_each_memblock(memory, reg) {
688                storage_key_init_range(reg->base, reg->base + reg->size);
689        }
690        psw_set_key(PAGE_DEFAULT_KEY);
691
692        /* Only cosmetics */
693        memblock_enforce_memory_limit(memblock_end_of_DRAM());
694}
695
696/*
697 * Setup hardware capabilities.
698 */
699static int __init setup_hwcaps(void)
700{
701        static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
702        struct cpuid cpu_id;
703        int i;
704
705        /*
706         * The store facility list bits numbers as found in the principles
707         * of operation are numbered with bit 1UL<<31 as number 0 to
708         * bit 1UL<<0 as number 31.
709         *   Bit 0: instructions named N3, "backported" to esa-mode
710         *   Bit 2: z/Architecture mode is active
711         *   Bit 7: the store-facility-list-extended facility is installed
712         *   Bit 17: the message-security assist is installed
713         *   Bit 19: the long-displacement facility is installed
714         *   Bit 21: the extended-immediate facility is installed
715         *   Bit 22: extended-translation facility 3 is installed
716         *   Bit 30: extended-translation facility 3 enhancement facility
717         * These get translated to:
718         *   HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
719         *   HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
720         *   HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
721         *   HWCAP_S390_ETF3EH bit 8 (22 && 30).
722         */
723        for (i = 0; i < 6; i++)
724                if (test_facility(stfl_bits[i]))
725                        elf_hwcap |= 1UL << i;
726
727        if (test_facility(22) && test_facility(30))
728                elf_hwcap |= HWCAP_S390_ETF3EH;
729
730        /*
731         * Check for additional facilities with store-facility-list-extended.
732         * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
733         * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
734         * as stored by stfl, bits 32-xxx contain additional facilities.
735         * How many facility words are stored depends on the number of
736         * doublewords passed to the instruction. The additional facilities
737         * are:
738         *   Bit 42: decimal floating point facility is installed
739         *   Bit 44: perform floating point operation facility is installed
740         * translated to:
741         *   HWCAP_S390_DFP bit 6 (42 && 44).
742         */
743        if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
744                elf_hwcap |= HWCAP_S390_DFP;
745
746        /*
747         * Huge page support HWCAP_S390_HPAGE is bit 7.
748         */
749        if (MACHINE_HAS_HPAGE)
750                elf_hwcap |= HWCAP_S390_HPAGE;
751
752        /*
753         * 64-bit register support for 31-bit processes
754         * HWCAP_S390_HIGH_GPRS is bit 9.
755         */
756        elf_hwcap |= HWCAP_S390_HIGH_GPRS;
757
758        /*
759         * Transactional execution support HWCAP_S390_TE is bit 10.
760         */
761        if (test_facility(50) && test_facility(73))
762                elf_hwcap |= HWCAP_S390_TE;
763
764        /*
765         * Vector extension HWCAP_S390_VXRS is bit 11. The Vector extension
766         * can be disabled with the "novx" parameter. Use MACHINE_HAS_VX
767         * instead of facility bit 129.
768         */
769        if (MACHINE_HAS_VX)
770                elf_hwcap |= HWCAP_S390_VXRS;
771        get_cpu_id(&cpu_id);
772        add_device_randomness(&cpu_id, sizeof(cpu_id));
773        switch (cpu_id.machine) {
774        case 0x2064:
775        case 0x2066:
776        default:        /* Use "z900" as default for 64 bit kernels. */
777                strcpy(elf_platform, "z900");
778                break;
779        case 0x2084:
780        case 0x2086:
781                strcpy(elf_platform, "z990");
782                break;
783        case 0x2094:
784        case 0x2096:
785                strcpy(elf_platform, "z9-109");
786                break;
787        case 0x2097:
788        case 0x2098:
789                strcpy(elf_platform, "z10");
790                break;
791        case 0x2817:
792        case 0x2818:
793                strcpy(elf_platform, "z196");
794                break;
795        case 0x2827:
796        case 0x2828:
797                strcpy(elf_platform, "zEC12");
798                break;
799        case 0x2964:
800        case 0x2965:
801                strcpy(elf_platform, "z13");
802                break;
803        }
804
805        /*
806         * Virtualization support HWCAP_INT_SIE is bit 0.
807         */
808        if (sclp.has_sief2)
809                int_hwcap |= HWCAP_INT_SIE;
810
811        return 0;
812}
813arch_initcall(setup_hwcaps);
814
815/*
816 * Add system information as device randomness
817 */
818static void __init setup_randomness(void)
819{
820        struct sysinfo_3_2_2 *vmms;
821
822        vmms = (struct sysinfo_3_2_2 *) memblock_alloc(PAGE_SIZE, PAGE_SIZE);
823        if (stsi(vmms, 3, 2, 2) == 0 && vmms->count)
824                add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count);
825        memblock_free((unsigned long) vmms, PAGE_SIZE);
826}
827
828/*
829 * Find the correct size for the task_struct. This depends on
830 * the size of the struct fpu at the end of the thread_struct
831 * which is embedded in the task_struct.
832 */
833static void __init setup_task_size(void)
834{
835        int task_size = sizeof(struct task_struct);
836
837        if (!MACHINE_HAS_VX) {
838                task_size -= sizeof(__vector128) * __NUM_VXRS;
839                task_size += sizeof(freg_t) * __NUM_FPRS;
840        }
841        arch_task_struct_size = task_size;
842}
843
844/*
845 * Setup function called from init/main.c just after the banner
846 * was printed.
847 */
848
849void __init setup_arch(char **cmdline_p)
850{
851        /*
852         * print what head.S has found out about the machine
853         */
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
862        /* Have one command line that is parsed and saved in /proc/cmdline */
863        /* boot_command_line has been already set up in early.c */
864        *cmdline_p = boot_command_line;
865
866        ROOT_DEV = Root_RAM0;
867
868        /* Is init_mm really needed? */
869        init_mm.start_code = PAGE_OFFSET;
870        init_mm.end_code = (unsigned long) &_etext;
871        init_mm.end_data = (unsigned long) &_edata;
872        init_mm.brk = (unsigned long) &_end;
873
874        parse_early_param();
875#ifdef CONFIG_CRASH_DUMP
876        /* Deactivate elfcorehdr= kernel parameter */
877        elfcorehdr_addr = ELFCORE_ADDR_MAX;
878#endif
879
880        os_info_init();
881        setup_ipl();
882        setup_task_size();
883
884        /* Do some memory reservations *before* memory is added to memblock */
885        reserve_memory_end();
886        reserve_oldmem();
887        reserve_kernel();
888        reserve_initrd();
889        memblock_allow_resize();
890
891        /* Get information about *all* installed memory */
892        detect_memory_memblock();
893
894        remove_oldmem();
895
896        /*
897         * Make sure all chunks are MAX_ORDER aligned so we don't need the
898         * extra checks that HOLES_IN_ZONE would require.
899         *
900         * Is this still required?
901         */
902        memblock_trim_memory(1UL << (MAX_ORDER - 1 + PAGE_SHIFT));
903
904        setup_memory_end();
905        setup_memory();
906
907        check_initrd();
908        reserve_crashkernel();
909#ifdef CONFIG_CRASH_DUMP
910        /*
911         * Be aware that smp_save_dump_cpus() triggers a system reset.
912         * Therefore CPU and device initialization should be done afterwards.
913         */
914        smp_save_dump_cpus();
915#endif
916
917        setup_resources();
918        setup_vmcoreinfo();
919        setup_lowcore();
920        smp_fill_possible_mask();
921        cpu_detect_mhz_feature();
922        cpu_init();
923        numa_setup();
924
925        /*
926         * Create kernel page tables and switch to virtual addressing.
927         */
928        paging_init();
929
930        /* Setup default console */
931        conmode_default();
932        set_preferred_console();
933
934        /* Setup zfcpdump support */
935        setup_zfcpdump();
936
937        /* Add system specific data to the random pool */
938        setup_randomness();
939}
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