source: src/linux/universal/linux-4.4/arch/s390/kernel/setup.c @ 31662

Last change on this file since 31662 was 31662, checked in by brainslayer, 7 weeks ago

use new squashfs in all kernels

File size: 23.9 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
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
96unsigned long MODULES_VADDR;
97unsigned long MODULES_END;
98
99/* An array with a pointer to the lowcore of every CPU. */
100struct _lowcore *lowcore_ptr[NR_CPUS];
101EXPORT_SYMBOL(lowcore_ptr);
102
103/*
104 * This is set up by the setup-routine at boot-time
105 * for S390 need to find out, what we have to setup
106 * using address 0x10400 ...
107 */
108
109#include <asm/setup.h>
110
111/*
112 * condev= and conmode= setup parameter.
113 */
114
115static int __init condev_setup(char *str)
116{
117        int vdev;
118
119        vdev = simple_strtoul(str, &str, 0);
120        if (vdev >= 0 && vdev < 65536) {
121                console_devno = vdev;
122                console_irq = -1;
123        }
124        return 1;
125}
126
127__setup("condev=", condev_setup);
128
129static void __init set_preferred_console(void)
130{
131        if (MACHINE_IS_KVM) {
132                if (sclp.has_vt220)
133                        add_preferred_console("ttyS", 1, NULL);
134                else if (sclp.has_linemode)
135                        add_preferred_console("ttyS", 0, NULL);
136                else
137                        add_preferred_console("hvc", 0, NULL);
138        } else if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
139                add_preferred_console("ttyS", 0, NULL);
140        else if (CONSOLE_IS_3270)
141                add_preferred_console("tty3270", 0, NULL);
142}
143
144static int __init conmode_setup(char *str)
145{
146#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
147        if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
148                SET_CONSOLE_SCLP;
149#endif
150#if defined(CONFIG_TN3215_CONSOLE)
151        if (strncmp(str, "3215", 5) == 0)
152                SET_CONSOLE_3215;
153#endif
154#if defined(CONFIG_TN3270_CONSOLE)
155        if (strncmp(str, "3270", 5) == 0)
156                SET_CONSOLE_3270;
157#endif
158        set_preferred_console();
159        return 1;
160}
161
162__setup("conmode=", conmode_setup);
163
164static void __init conmode_default(void)
165{
166        char query_buffer[1024];
167        char *ptr;
168
169        if (MACHINE_IS_VM) {
170                cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
171                console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
172                ptr = strstr(query_buffer, "SUBCHANNEL =");
173                console_irq = simple_strtoul(ptr + 13, NULL, 16);
174                cpcmd("QUERY TERM", query_buffer, 1024, NULL);
175                ptr = strstr(query_buffer, "CONMODE");
176                /*
177                 * Set the conmode to 3215 so that the device recognition
178                 * will set the cu_type of the console to 3215. If the
179                 * conmode is 3270 and we don't set it back then both
180                 * 3215 and the 3270 driver will try to access the console
181                 * device (3215 as console and 3270 as normal tty).
182                 */
183                cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
184                if (ptr == NULL) {
185#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
186                        SET_CONSOLE_SCLP;
187#endif
188                        return;
189                }
190                if (strncmp(ptr + 8, "3270", 4) == 0) {
191#if defined(CONFIG_TN3270_CONSOLE)
192                        SET_CONSOLE_3270;
193#elif defined(CONFIG_TN3215_CONSOLE)
194                        SET_CONSOLE_3215;
195#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
196                        SET_CONSOLE_SCLP;
197#endif
198                } else if (strncmp(ptr + 8, "3215", 4) == 0) {
199#if defined(CONFIG_TN3215_CONSOLE)
200                        SET_CONSOLE_3215;
201#elif defined(CONFIG_TN3270_CONSOLE)
202                        SET_CONSOLE_3270;
203#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
204                        SET_CONSOLE_SCLP;
205#endif
206                }
207        } else {
208#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
209                SET_CONSOLE_SCLP;
210#endif
211        }
212}
213
214#ifdef CONFIG_CRASH_DUMP
215static void __init setup_zfcpdump(void)
216{
217        if (ipl_info.type != IPL_TYPE_FCP_DUMP)
218                return;
219        if (OLDMEM_BASE)
220                return;
221        strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev");
222        console_loglevel = 2;
223}
224#else
225static inline void setup_zfcpdump(void) {}
226#endif /* CONFIG_CRASH_DUMP */
227
228 /*
229 * Reboot, halt and power_off stubs. They just call _machine_restart,
230 * _machine_halt or _machine_power_off.
231 */
232
233void machine_restart(char *command)
234{
235        if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
236                /*
237                 * Only unblank the console if we are called in enabled
238                 * context or a bust_spinlocks cleared the way for us.
239                 */
240                console_unblank();
241        _machine_restart(command);
242}
243
244void machine_halt(void)
245{
246        if (!in_interrupt() || oops_in_progress)
247                /*
248                 * Only unblank the console if we are called in enabled
249                 * context or a bust_spinlocks cleared the way for us.
250                 */
251                console_unblank();
252        _machine_halt();
253}
254
255void machine_power_off(void)
256{
257        if (!in_interrupt() || oops_in_progress)
258                /*
259                 * Only unblank the console if we are called in enabled
260                 * context or a bust_spinlocks cleared the way for us.
261                 */
262                console_unblank();
263        _machine_power_off();
264}
265
266/*
267 * Dummy power off function.
268 */
269void (*pm_power_off)(void) = machine_power_off;
270EXPORT_SYMBOL_GPL(pm_power_off);
271
272static int __init early_parse_mem(char *p)
273{
274        memory_end = memparse(p, &p);
275        memory_end &= PAGE_MASK;
276        memory_end_set = 1;
277        return 0;
278}
279early_param("mem", early_parse_mem);
280
281static int __init parse_vmalloc(char *arg)
282{
283        if (!arg)
284                return -EINVAL;
285        VMALLOC_END = (memparse(arg, &arg) + PAGE_SIZE - 1) & PAGE_MASK;
286        return 0;
287}
288early_param("vmalloc", parse_vmalloc);
289
290void *restart_stack __attribute__((__section__(".data")));
291
292static void __init setup_lowcore(void)
293{
294        struct _lowcore *lc;
295
296        /*
297         * Setup lowcore for boot cpu
298         */
299        BUILD_BUG_ON(sizeof(struct _lowcore) != LC_PAGES * 4096);
300        lc = __alloc_bootmem_low(LC_PAGES * PAGE_SIZE, LC_PAGES * PAGE_SIZE, 0);
301        lc->restart_psw.mask = PSW_KERNEL_BITS;
302        lc->restart_psw.addr =
303                PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
304        lc->external_new_psw.mask = PSW_KERNEL_BITS |
305                PSW_MASK_DAT | PSW_MASK_MCHECK;
306        lc->external_new_psw.addr =
307                PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
308        lc->svc_new_psw.mask = PSW_KERNEL_BITS |
309                PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
310        lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
311        lc->program_new_psw.mask = PSW_KERNEL_BITS |
312                PSW_MASK_DAT | PSW_MASK_MCHECK;
313        lc->program_new_psw.addr =
314                PSW_ADDR_AMODE | (unsigned long) pgm_check_handler;
315        lc->mcck_new_psw.mask = PSW_KERNEL_BITS;
316        lc->mcck_new_psw.addr =
317                PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
318        lc->io_new_psw.mask = PSW_KERNEL_BITS |
319                PSW_MASK_DAT | PSW_MASK_MCHECK;
320        lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
321        lc->clock_comparator = -1ULL;
322        lc->kernel_stack = ((unsigned long) &init_thread_union)
323                + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
324        lc->async_stack = (unsigned long)
325                __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0)
326                + ASYNC_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
327        lc->panic_stack = (unsigned long)
328                __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0)
329                + PAGE_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
330        lc->current_task = (unsigned long) init_thread_union.thread_info.task;
331        lc->thread_info = (unsigned long) &init_thread_union;
332        lc->lpp = LPP_MAGIC;
333        lc->machine_flags = S390_lowcore.machine_flags;
334        lc->stfl_fac_list = S390_lowcore.stfl_fac_list;
335        memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
336               MAX_FACILITY_BIT/8);
337        if (MACHINE_HAS_VX)
338                lc->vector_save_area_addr =
339                        (unsigned long) &lc->vector_save_area;
340        lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0];
341        lc->sync_enter_timer = S390_lowcore.sync_enter_timer;
342        lc->async_enter_timer = S390_lowcore.async_enter_timer;
343        lc->exit_timer = S390_lowcore.exit_timer;
344        lc->user_timer = S390_lowcore.user_timer;
345        lc->system_timer = S390_lowcore.system_timer;
346        lc->steal_timer = S390_lowcore.steal_timer;
347        lc->last_update_timer = S390_lowcore.last_update_timer;
348        lc->last_update_clock = S390_lowcore.last_update_clock;
349
350        restart_stack = __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0);
351        restart_stack += ASYNC_SIZE;
352
353        /*
354         * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant
355         * restart data to the absolute zero lowcore. This is necessary if
356         * PSW restart is done on an offline CPU that has lowcore zero.
357         */
358        lc->restart_stack = (unsigned long) restart_stack;
359        lc->restart_fn = (unsigned long) do_restart;
360        lc->restart_data = 0;
361        lc->restart_source = -1UL;
362
363        /* Setup absolute zero lowcore */
364        mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack);
365        mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn);
366        mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data);
367        mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source);
368        mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw);
369
370#ifdef CONFIG_SMP
371        lc->spinlock_lockval = arch_spin_lockval(0);
372#endif
373
374        set_prefix((u32)(unsigned long) lc);
375        lowcore_ptr[0] = lc;
376}
377
378static struct resource code_resource = {
379        .name  = "Kernel code",
380        .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
381};
382
383static struct resource data_resource = {
384        .name = "Kernel data",
385        .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
386};
387
388static struct resource bss_resource = {
389        .name = "Kernel bss",
390        .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
391};
392
393static struct resource __initdata *standard_resources[] = {
394        &code_resource,
395        &data_resource,
396        &bss_resource,
397};
398
399static void __init setup_resources(void)
400{
401        struct resource *res, *std_res, *sub_res;
402        struct memblock_region *reg;
403        int j;
404
405        code_resource.start = (unsigned long) &_text;
406        code_resource.end = (unsigned long) &_etext - 1;
407        data_resource.start = (unsigned long) &_etext;
408        data_resource.end = (unsigned long) &_edata - 1;
409        bss_resource.start = (unsigned long) &__bss_start;
410        bss_resource.end = (unsigned long) &__bss_stop - 1;
411
412        for_each_memblock(memory, reg) {
413                res = alloc_bootmem_low(sizeof(*res));
414                res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
415
416                res->name = "System RAM";
417                res->start = reg->base;
418                res->end = reg->base + reg->size - 1;
419                request_resource(&iomem_resource, res);
420
421                for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
422                        std_res = standard_resources[j];
423                        if (std_res->start < res->start ||
424                            std_res->start > res->end)
425                                continue;
426                        if (std_res->end > res->end) {
427                                sub_res = alloc_bootmem_low(sizeof(*sub_res));
428                                *sub_res = *std_res;
429                                sub_res->end = res->end;
430                                std_res->start = res->end + 1;
431                                request_resource(res, sub_res);
432                        } else {
433                                request_resource(res, std_res);
434                        }
435                }
436        }
437}
438
439static void __init setup_memory_end(void)
440{
441        unsigned long vmax, vmalloc_size, tmp;
442
443        /* Choose kernel address space layout: 2, 3, or 4 levels. */
444        vmalloc_size = VMALLOC_END ?: (128UL << 30) - MODULES_LEN;
445        tmp = (memory_end ?: max_physmem_end) / PAGE_SIZE;
446        tmp = tmp * (sizeof(struct page) + PAGE_SIZE);
447        if (tmp + vmalloc_size + MODULES_LEN <= (1UL << 42))
448                vmax = 1UL << 42;       /* 3-level kernel page table */
449        else
450                vmax = 1UL << 53;       /* 4-level kernel page table */
451        /* module area is at the end of the kernel address space. */
452        MODULES_END = vmax;
453        MODULES_VADDR = MODULES_END - MODULES_LEN;
454        VMALLOC_END = MODULES_VADDR;
455        VMALLOC_START = vmax - vmalloc_size;
456
457        /* Split remaining virtual space between 1:1 mapping & vmemmap array */
458        tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page));
459        /* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */
460        tmp = SECTION_ALIGN_UP(tmp);
461        tmp = VMALLOC_START - tmp * sizeof(struct page);
462        tmp &= ~((vmax >> 11) - 1);     /* align to page table level */
463        tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS);
464        vmemmap = (struct page *) tmp;
465
466        /* Take care that memory_end is set and <= vmemmap */
467        memory_end = min(memory_end ?: max_physmem_end, tmp);
468        max_pfn = max_low_pfn = PFN_DOWN(memory_end);
469        memblock_remove(memory_end, ULONG_MAX);
470
471        pr_notice("Max memory size: %luMB\n", memory_end >> 20);
472}
473
474static void __init setup_vmcoreinfo(void)
475{
476        mem_assign_absolute(S390_lowcore.vmcore_info, paddr_vmcoreinfo_note());
477}
478
479#ifdef CONFIG_CRASH_DUMP
480
481/*
482 * When kdump is enabled, we have to ensure that no memory from
483 * the area [0 - crashkernel memory size] and
484 * [crashk_res.start - crashk_res.end] is set offline.
485 */
486static int kdump_mem_notifier(struct notifier_block *nb,
487                              unsigned long action, void *data)
488{
489        struct memory_notify *arg = data;
490
491        if (action != MEM_GOING_OFFLINE)
492                return NOTIFY_OK;
493        if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
494                return NOTIFY_BAD;
495        if (arg->start_pfn > PFN_DOWN(crashk_res.end))
496                return NOTIFY_OK;
497        if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start))
498                return NOTIFY_OK;
499        return NOTIFY_BAD;
500}
501
502static struct notifier_block kdump_mem_nb = {
503        .notifier_call = kdump_mem_notifier,
504};
505
506#endif
507
508/*
509 * Make sure that the area behind memory_end is protected
510 */
511static void reserve_memory_end(void)
512{
513#ifdef CONFIG_CRASH_DUMP
514        if (ipl_info.type == IPL_TYPE_FCP_DUMP &&
515            !OLDMEM_BASE && sclp.hsa_size) {
516                memory_end = sclp.hsa_size;
517                memory_end &= PAGE_MASK;
518                memory_end_set = 1;
519        }
520#endif
521        if (!memory_end_set)
522                return;
523        memblock_reserve(memory_end, ULONG_MAX);
524}
525
526/*
527 * Make sure that oldmem, where the dump is stored, is protected
528 */
529static void reserve_oldmem(void)
530{
531#ifdef CONFIG_CRASH_DUMP
532        if (OLDMEM_BASE)
533                /* Forget all memory above the running kdump system */
534                memblock_reserve(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX);
535#endif
536}
537
538/*
539 * Make sure that oldmem, where the dump is stored, is protected
540 */
541static void remove_oldmem(void)
542{
543#ifdef CONFIG_CRASH_DUMP
544        if (OLDMEM_BASE)
545                /* Forget all memory above the running kdump system */
546                memblock_remove(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX);
547#endif
548}
549
550/*
551 * Reserve memory for kdump kernel to be loaded with kexec
552 */
553static void __init reserve_crashkernel(void)
554{
555#ifdef CONFIG_CRASH_DUMP
556        unsigned long long crash_base, crash_size;
557        phys_addr_t low, high;
558        int rc;
559
560        rc = parse_crashkernel(boot_command_line, memory_end, &crash_size,
561                               &crash_base);
562
563        crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
564        crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
565        if (rc || crash_size == 0)
566                return;
567
568        if (memblock.memory.regions[0].size < crash_size) {
569                pr_info("crashkernel reservation failed: %s\n",
570                        "first memory chunk must be at least crashkernel size");
571                return;
572        }
573
574        low = crash_base ?: OLDMEM_BASE;
575        high = low + crash_size;
576        if (low >= OLDMEM_BASE && high <= OLDMEM_BASE + OLDMEM_SIZE) {
577                /* The crashkernel fits into OLDMEM, reuse OLDMEM */
578                crash_base = low;
579        } else {
580                /* Find suitable area in free memory */
581                low = max_t(unsigned long, crash_size, sclp.hsa_size);
582                high = crash_base ? crash_base + crash_size : ULONG_MAX;
583
584                if (crash_base && crash_base < low) {
585                        pr_info("crashkernel reservation failed: %s\n",
586                                "crash_base too low");
587                        return;
588                }
589                low = crash_base ?: low;
590                crash_base = memblock_find_in_range(low, high, crash_size,
591                                                    KEXEC_CRASH_MEM_ALIGN);
592        }
593
594        if (!crash_base) {
595                pr_info("crashkernel reservation failed: %s\n",
596                        "no suitable area found");
597                return;
598        }
599
600        if (register_memory_notifier(&kdump_mem_nb))
601                return;
602
603        if (!OLDMEM_BASE && MACHINE_IS_VM)
604                diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
605        crashk_res.start = crash_base;
606        crashk_res.end = crash_base + crash_size - 1;
607        insert_resource(&iomem_resource, &crashk_res);
608        memblock_remove(crash_base, crash_size);
609        pr_info("Reserving %lluMB of memory at %lluMB "
610                "for crashkernel (System RAM: %luMB)\n",
611                crash_size >> 20, crash_base >> 20,
612                (unsigned long)memblock.memory.total_size >> 20);
613        os_info_crashkernel_add(crash_base, crash_size);
614#endif
615}
616
617/*
618 * Reserve the initrd from being used by memblock
619 */
620static void __init reserve_initrd(void)
621{
622#ifdef CONFIG_BLK_DEV_INITRD
623        initrd_start = INITRD_START;
624        initrd_end = initrd_start + INITRD_SIZE;
625        memblock_reserve(INITRD_START, INITRD_SIZE);
626#endif
627}
628
629/*
630 * Check for initrd being in usable memory
631 */
632static void __init check_initrd(void)
633{
634#ifdef CONFIG_BLK_DEV_INITRD
635        if (INITRD_START && INITRD_SIZE &&
636            !memblock_is_region_memory(INITRD_START, INITRD_SIZE)) {
637                pr_err("initrd does not fit memory.\n");
638                memblock_free(INITRD_START, INITRD_SIZE);
639                initrd_start = initrd_end = 0;
640        }
641#endif
642}
643
644/*
645 * Reserve memory used for lowcore/command line/kernel image.
646 */
647static void __init reserve_kernel(void)
648{
649        unsigned long start_pfn = PFN_UP(__pa(&_end));
650
651#ifdef CONFIG_DMA_API_DEBUG
652        /*
653         * DMA_API_DEBUG code stumbles over addresses from the
654         * range [_ehead, _stext]. Mark the memory as reserved
655         * so it is not used for CONFIG_DMA_API_DEBUG=y.
656         */
657        memblock_reserve(0, PFN_PHYS(start_pfn));
658#else
659        memblock_reserve(0, (unsigned long)_ehead);
660        memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn)
661                         - (unsigned long)_stext);
662#endif
663}
664
665static void __init reserve_elfcorehdr(void)
666{
667#ifdef CONFIG_CRASH_DUMP
668        if (is_kdump_kernel())
669                memblock_reserve(elfcorehdr_addr - OLDMEM_BASE,
670                                 PAGE_ALIGN(elfcorehdr_size));
671#endif
672}
673
674static void __init setup_memory(void)
675{
676        struct memblock_region *reg;
677
678        /*
679         * Init storage key for present memory
680         */
681        for_each_memblock(memory, reg) {
682                storage_key_init_range(reg->base, reg->base + reg->size);
683        }
684        psw_set_key(PAGE_DEFAULT_KEY);
685
686        /* Only cosmetics */
687        memblock_enforce_memory_limit(memblock_end_of_DRAM());
688}
689
690/*
691 * Setup hardware capabilities.
692 */
693static int __init setup_hwcaps(void)
694{
695        static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
696        struct cpuid cpu_id;
697        int i;
698
699        /*
700         * The store facility list bits numbers as found in the principles
701         * of operation are numbered with bit 1UL<<31 as number 0 to
702         * bit 1UL<<0 as number 31.
703         *   Bit 0: instructions named N3, "backported" to esa-mode
704         *   Bit 2: z/Architecture mode is active
705         *   Bit 7: the store-facility-list-extended facility is installed
706         *   Bit 17: the message-security assist is installed
707         *   Bit 19: the long-displacement facility is installed
708         *   Bit 21: the extended-immediate facility is installed
709         *   Bit 22: extended-translation facility 3 is installed
710         *   Bit 30: extended-translation facility 3 enhancement facility
711         * These get translated to:
712         *   HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
713         *   HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
714         *   HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
715         *   HWCAP_S390_ETF3EH bit 8 (22 && 30).
716         */
717        for (i = 0; i < 6; i++)
718                if (test_facility(stfl_bits[i]))
719                        elf_hwcap |= 1UL << i;
720
721        if (test_facility(22) && test_facility(30))
722                elf_hwcap |= HWCAP_S390_ETF3EH;
723
724        /*
725         * Check for additional facilities with store-facility-list-extended.
726         * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
727         * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
728         * as stored by stfl, bits 32-xxx contain additional facilities.
729         * How many facility words are stored depends on the number of
730         * doublewords passed to the instruction. The additional facilities
731         * are:
732         *   Bit 42: decimal floating point facility is installed
733         *   Bit 44: perform floating point operation facility is installed
734         * translated to:
735         *   HWCAP_S390_DFP bit 6 (42 && 44).
736         */
737        if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
738                elf_hwcap |= HWCAP_S390_DFP;
739
740        /*
741         * Huge page support HWCAP_S390_HPAGE is bit 7.
742         */
743        if (MACHINE_HAS_HPAGE)
744                elf_hwcap |= HWCAP_S390_HPAGE;
745
746        /*
747         * 64-bit register support for 31-bit processes
748         * HWCAP_S390_HIGH_GPRS is bit 9.
749         */
750        elf_hwcap |= HWCAP_S390_HIGH_GPRS;
751
752        /*
753         * Transactional execution support HWCAP_S390_TE is bit 10.
754         */
755        if (test_facility(50) && test_facility(73))
756                elf_hwcap |= HWCAP_S390_TE;
757
758        /*
759         * Vector extension HWCAP_S390_VXRS is bit 11. The Vector extension
760         * can be disabled with the "novx" parameter. Use MACHINE_HAS_VX
761         * instead of facility bit 129.
762         */
763        if (MACHINE_HAS_VX)
764                elf_hwcap |= HWCAP_S390_VXRS;
765        get_cpu_id(&cpu_id);
766        add_device_randomness(&cpu_id, sizeof(cpu_id));
767        switch (cpu_id.machine) {
768        case 0x2064:
769        case 0x2066:
770        default:        /* Use "z900" as default for 64 bit kernels. */
771                strcpy(elf_platform, "z900");
772                break;
773        case 0x2084:
774        case 0x2086:
775                strcpy(elf_platform, "z990");
776                break;
777        case 0x2094:
778        case 0x2096:
779                strcpy(elf_platform, "z9-109");
780                break;
781        case 0x2097:
782        case 0x2098:
783                strcpy(elf_platform, "z10");
784                break;
785        case 0x2817:
786        case 0x2818:
787                strcpy(elf_platform, "z196");
788                break;
789        case 0x2827:
790        case 0x2828:
791                strcpy(elf_platform, "zEC12");
792                break;
793        case 0x2964:
794                strcpy(elf_platform, "z13");
795                break;
796        }
797        return 0;
798}
799arch_initcall(setup_hwcaps);
800
801/*
802 * Add system information as device randomness
803 */
804static void __init setup_randomness(void)
805{
806        struct sysinfo_3_2_2 *vmms;
807
808        vmms = (struct sysinfo_3_2_2 *) memblock_alloc(PAGE_SIZE, PAGE_SIZE);
809        if (stsi(vmms, 3, 2, 2) == 0 && vmms->count)
810                add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count);
811        memblock_free((unsigned long) vmms, PAGE_SIZE);
812}
813
814/*
815 * Setup function called from init/main.c just after the banner
816 * was printed.
817 */
818
819void __init setup_arch(char **cmdline_p)
820{
821        /*
822         * print what head.S has found out about the machine
823         */
824        if (MACHINE_IS_VM)
825                pr_info("Linux is running as a z/VM "
826                        "guest operating system in 64-bit mode\n");
827        else if (MACHINE_IS_KVM)
828                pr_info("Linux is running under KVM in 64-bit mode\n");
829        else if (MACHINE_IS_LPAR)
830                pr_info("Linux is running natively in 64-bit mode\n");
831
832        /* Have one command line that is parsed and saved in /proc/cmdline */
833        /* boot_command_line has been already set up in early.c */
834        *cmdline_p = boot_command_line;
835
836        ROOT_DEV = Root_RAM0;
837
838        /* Is init_mm really needed? */
839        init_mm.start_code = PAGE_OFFSET;
840        init_mm.end_code = (unsigned long) &_etext;
841        init_mm.end_data = (unsigned long) &_edata;
842        init_mm.brk = (unsigned long) &_end;
843
844        parse_early_param();
845        os_info_init();
846        setup_ipl();
847
848        /* Do some memory reservations *before* memory is added to memblock */
849        reserve_memory_end();
850        reserve_oldmem();
851        reserve_kernel();
852        reserve_initrd();
853        reserve_elfcorehdr();
854        memblock_allow_resize();
855
856        /* Get information about *all* installed memory */
857        detect_memory_memblock();
858
859        remove_oldmem();
860
861        /*
862         * Make sure all chunks are MAX_ORDER aligned so we don't need the
863         * extra checks that HOLES_IN_ZONE would require.
864         *
865         * Is this still required?
866         */
867        memblock_trim_memory(1UL << (MAX_ORDER - 1 + PAGE_SHIFT));
868
869        setup_memory_end();
870        setup_memory();
871
872        check_initrd();
873        reserve_crashkernel();
874        /*
875         * Be aware that smp_save_dump_cpus() triggers a system reset.
876         * Therefore CPU and device initialization should be done afterwards.
877         */
878        smp_save_dump_cpus();
879
880        setup_resources();
881        setup_vmcoreinfo();
882        setup_lowcore();
883        smp_fill_possible_mask();
884        cpu_init();
885        numa_setup();
886
887        /*
888         * Create kernel page tables and switch to virtual addressing.
889         */
890        paging_init();
891
892        /* Setup default console */
893        conmode_default();
894        set_preferred_console();
895
896        /* Setup zfcpdump support */
897        setup_zfcpdump();
898
899        /* Add system specific data to the random pool */
900        setup_randomness();
901}
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