Root/arch/s390/kernel/setup.c

1/*
2 * arch/s390/kernel/setup.c
3 *
4 * S390 version
5 * Copyright (C) IBM Corp. 1999,2010
6 * Author(s): Hartmut Penner (hp@de.ibm.com),
7 * Martin Schwidefsky (schwidefsky@de.ibm.com)
8 *
9 * Derived from "arch/i386/kernel/setup.c"
10 * Copyright (C) 1995, Linus Torvalds
11 */
12
13/*
14 * This file handles the architecture-dependent parts of initialization
15 */
16
17#define KMSG_COMPONENT "setup"
18#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
19
20#include <linux/errno.h>
21#include <linux/module.h>
22#include <linux/sched.h>
23#include <linux/kernel.h>
24#include <linux/mm.h>
25#include <linux/stddef.h>
26#include <linux/unistd.h>
27#include <linux/ptrace.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
46#include <asm/ipl.h>
47#include <asm/uaccess.h>
48#include <asm/system.h>
49#include <asm/smp.h>
50#include <asm/mmu_context.h>
51#include <asm/cpcmd.h>
52#include <asm/lowcore.h>
53#include <asm/irq.h>
54#include <asm/page.h>
55#include <asm/ptrace.h>
56#include <asm/sections.h>
57#include <asm/ebcdic.h>
58#include <asm/compat.h>
59#include <asm/kvm_virtio.h>
60
61long psw_kernel_bits = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_PRIMARY |
62               PSW_MASK_MCHECK | PSW_DEFAULT_KEY);
63long psw_user_bits = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
64               PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
65               PSW_MASK_PSTATE | PSW_DEFAULT_KEY);
66
67/*
68 * User copy operations.
69 */
70struct uaccess_ops uaccess;
71EXPORT_SYMBOL(uaccess);
72
73/*
74 * Machine setup..
75 */
76unsigned int console_mode = 0;
77EXPORT_SYMBOL(console_mode);
78
79unsigned int console_devno = -1;
80EXPORT_SYMBOL(console_devno);
81
82unsigned int console_irq = -1;
83EXPORT_SYMBOL(console_irq);
84
85unsigned long elf_hwcap = 0;
86char elf_platform[ELF_PLATFORM_SIZE];
87
88struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS];
89
90int __initdata memory_end_set;
91unsigned long __initdata memory_end;
92
93/* An array with a pointer to the lowcore of every CPU. */
94struct _lowcore *lowcore_ptr[NR_CPUS];
95EXPORT_SYMBOL(lowcore_ptr);
96
97/*
98 * This is set up by the setup-routine at boot-time
99 * for S390 need to find out, what we have to setup
100 * using address 0x10400 ...
101 */
102
103#include <asm/setup.h>
104
105static struct resource code_resource = {
106    .name = "Kernel code",
107    .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
108};
109
110static struct resource data_resource = {
111    .name = "Kernel data",
112    .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
113};
114
115/*
116 * condev= and conmode= setup parameter.
117 */
118
119static int __init condev_setup(char *str)
120{
121    int vdev;
122
123    vdev = simple_strtoul(str, &str, 0);
124    if (vdev >= 0 && vdev < 65536) {
125        console_devno = vdev;
126        console_irq = -1;
127    }
128    return 1;
129}
130
131__setup("condev=", condev_setup);
132
133static void __init set_preferred_console(void)
134{
135    if (MACHINE_IS_KVM)
136        add_preferred_console("hvc", 0, NULL);
137    else if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
138        add_preferred_console("ttyS", 0, NULL);
139    else if (CONSOLE_IS_3270)
140        add_preferred_console("tty3270", 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 {
207#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
208        SET_CONSOLE_SCLP;
209#endif
210    }
211}
212
213#ifdef CONFIG_ZFCPDUMP
214static void __init setup_zfcpdump(unsigned int console_devno)
215{
216    static char str[41];
217
218    if (ipl_info.type != IPL_TYPE_FCP_DUMP)
219        return;
220    if (console_devno != -1)
221        sprintf(str, " cio_ignore=all,!0.0.%04x,!0.0.%04x",
222            ipl_info.data.fcp.dev_id.devno, console_devno);
223    else
224        sprintf(str, " cio_ignore=all,!0.0.%04x",
225            ipl_info.data.fcp.dev_id.devno);
226    strcat(boot_command_line, str);
227    console_loglevel = 2;
228}
229#else
230static inline void setup_zfcpdump(unsigned int console_devno) {}
231#endif /* CONFIG_ZFCPDUMP */
232
233 /*
234 * Reboot, halt and power_off stubs. They just call _machine_restart,
235 * _machine_halt or _machine_power_off.
236 */
237
238void machine_restart(char *command)
239{
240    if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
241        /*
242         * Only unblank the console if we are called in enabled
243         * context or a bust_spinlocks cleared the way for us.
244         */
245        console_unblank();
246    _machine_restart(command);
247}
248
249void machine_halt(void)
250{
251    if (!in_interrupt() || oops_in_progress)
252        /*
253         * Only unblank the console if we are called in enabled
254         * context or a bust_spinlocks cleared the way for us.
255         */
256        console_unblank();
257    _machine_halt();
258}
259
260void machine_power_off(void)
261{
262    if (!in_interrupt() || oops_in_progress)
263        /*
264         * Only unblank the console if we are called in enabled
265         * context or a bust_spinlocks cleared the way for us.
266         */
267        console_unblank();
268    _machine_power_off();
269}
270
271/*
272 * Dummy power off function.
273 */
274void (*pm_power_off)(void) = machine_power_off;
275
276static int __init early_parse_mem(char *p)
277{
278    memory_end = memparse(p, &p);
279    memory_end_set = 1;
280    return 0;
281}
282early_param("mem", early_parse_mem);
283
284unsigned int user_mode = HOME_SPACE_MODE;
285EXPORT_SYMBOL_GPL(user_mode);
286
287static int set_amode_and_uaccess(unsigned long user_amode,
288                 unsigned long user32_amode)
289{
290    psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode |
291            PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
292            PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
293#ifdef CONFIG_COMPAT
294    psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode |
295              PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
296              PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
297    psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode |
298              PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK |
299              PSW32_MASK_PSTATE;
300#endif
301    psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
302              PSW_MASK_MCHECK | PSW_DEFAULT_KEY;
303
304    if (MACHINE_HAS_MVCOS) {
305        memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess));
306        return 1;
307    } else {
308        memcpy(&uaccess, &uaccess_pt, sizeof(uaccess));
309        return 0;
310    }
311}
312
313/*
314 * Switch kernel/user addressing modes?
315 */
316static int __init early_parse_switch_amode(char *p)
317{
318    if (user_mode != SECONDARY_SPACE_MODE)
319        user_mode = PRIMARY_SPACE_MODE;
320    return 0;
321}
322early_param("switch_amode", early_parse_switch_amode);
323
324static int __init early_parse_user_mode(char *p)
325{
326    if (p && strcmp(p, "primary") == 0)
327        user_mode = PRIMARY_SPACE_MODE;
328#ifdef CONFIG_S390_EXEC_PROTECT
329    else if (p && strcmp(p, "secondary") == 0)
330        user_mode = SECONDARY_SPACE_MODE;
331#endif
332    else if (!p || strcmp(p, "home") == 0)
333        user_mode = HOME_SPACE_MODE;
334    else
335        return 1;
336    return 0;
337}
338early_param("user_mode", early_parse_user_mode);
339
340#ifdef CONFIG_S390_EXEC_PROTECT
341/*
342 * Enable execute protection?
343 */
344static int __init early_parse_noexec(char *p)
345{
346    if (!strncmp(p, "off", 3))
347        return 0;
348    user_mode = SECONDARY_SPACE_MODE;
349    return 0;
350}
351early_param("noexec", early_parse_noexec);
352#endif /* CONFIG_S390_EXEC_PROTECT */
353
354static void setup_addressing_mode(void)
355{
356    if (user_mode == SECONDARY_SPACE_MODE) {
357        if (set_amode_and_uaccess(PSW_ASC_SECONDARY,
358                      PSW32_ASC_SECONDARY))
359            pr_info("Execute protection active, "
360                "mvcos available\n");
361        else
362            pr_info("Execute protection active, "
363                "mvcos not available\n");
364    } else if (user_mode == PRIMARY_SPACE_MODE) {
365        if (set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY))
366            pr_info("Address spaces switched, "
367                "mvcos available\n");
368        else
369            pr_info("Address spaces switched, "
370                "mvcos not available\n");
371    }
372}
373
374static void __init
375setup_lowcore(void)
376{
377    struct _lowcore *lc;
378
379    /*
380     * Setup lowcore for boot cpu
381     */
382    BUILD_BUG_ON(sizeof(struct _lowcore) != LC_PAGES * 4096);
383    lc = __alloc_bootmem_low(LC_PAGES * PAGE_SIZE, LC_PAGES * PAGE_SIZE, 0);
384    lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
385    lc->restart_psw.addr =
386        PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
387    if (user_mode != HOME_SPACE_MODE)
388        lc->restart_psw.mask |= PSW_ASC_HOME;
389    lc->external_new_psw.mask = psw_kernel_bits;
390    lc->external_new_psw.addr =
391        PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
392    lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT;
393    lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
394    lc->program_new_psw.mask = psw_kernel_bits;
395    lc->program_new_psw.addr =
396        PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
397    lc->mcck_new_psw.mask =
398        psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
399    lc->mcck_new_psw.addr =
400        PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
401    lc->io_new_psw.mask = psw_kernel_bits;
402    lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
403    lc->clock_comparator = -1ULL;
404    lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
405    lc->async_stack = (unsigned long)
406        __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
407    lc->panic_stack = (unsigned long)
408        __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
409    lc->current_task = (unsigned long) init_thread_union.thread_info.task;
410    lc->thread_info = (unsigned long) &init_thread_union;
411    lc->machine_flags = S390_lowcore.machine_flags;
412    lc->stfl_fac_list = S390_lowcore.stfl_fac_list;
413    memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
414           MAX_FACILITY_BIT/8);
415#ifndef CONFIG_64BIT
416    if (MACHINE_HAS_IEEE) {
417        lc->extended_save_area_addr = (__u32)
418            __alloc_bootmem_low(PAGE_SIZE, PAGE_SIZE, 0);
419        /* enable extended save area */
420        __ctl_set_bit(14, 29);
421    }
422#else
423    lc->cmf_hpp = -1ULL;
424    lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0];
425#endif
426    lc->sync_enter_timer = S390_lowcore.sync_enter_timer;
427    lc->async_enter_timer = S390_lowcore.async_enter_timer;
428    lc->exit_timer = S390_lowcore.exit_timer;
429    lc->user_timer = S390_lowcore.user_timer;
430    lc->system_timer = S390_lowcore.system_timer;
431    lc->steal_timer = S390_lowcore.steal_timer;
432    lc->last_update_timer = S390_lowcore.last_update_timer;
433    lc->last_update_clock = S390_lowcore.last_update_clock;
434    lc->ftrace_func = S390_lowcore.ftrace_func;
435    set_prefix((u32)(unsigned long) lc);
436    lowcore_ptr[0] = lc;
437}
438
439static void __init
440setup_resources(void)
441{
442    struct resource *res, *sub_res;
443    int i;
444
445    code_resource.start = (unsigned long) &_text;
446    code_resource.end = (unsigned long) &_etext - 1;
447    data_resource.start = (unsigned long) &_etext;
448    data_resource.end = (unsigned long) &_edata - 1;
449
450    for (i = 0; i < MEMORY_CHUNKS; i++) {
451        if (!memory_chunk[i].size)
452            continue;
453        res = alloc_bootmem_low(sizeof(struct resource));
454        res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
455        switch (memory_chunk[i].type) {
456        case CHUNK_READ_WRITE:
457            res->name = "System RAM";
458            break;
459        case CHUNK_READ_ONLY:
460            res->name = "System ROM";
461            res->flags |= IORESOURCE_READONLY;
462            break;
463        default:
464            res->name = "reserved";
465        }
466        res->start = memory_chunk[i].addr;
467        res->end = memory_chunk[i].addr + memory_chunk[i].size - 1;
468        request_resource(&iomem_resource, res);
469
470        if (code_resource.start >= res->start &&
471            code_resource.start <= res->end &&
472            code_resource.end > res->end) {
473            sub_res = alloc_bootmem_low(sizeof(struct resource));
474            memcpy(sub_res, &code_resource,
475                sizeof(struct resource));
476            sub_res->end = res->end;
477            code_resource.start = res->end + 1;
478            request_resource(res, sub_res);
479        }
480
481        if (code_resource.start >= res->start &&
482            code_resource.start <= res->end &&
483            code_resource.end <= res->end)
484            request_resource(res, &code_resource);
485
486        if (data_resource.start >= res->start &&
487            data_resource.start <= res->end &&
488            data_resource.end > res->end) {
489            sub_res = alloc_bootmem_low(sizeof(struct resource));
490            memcpy(sub_res, &data_resource,
491                sizeof(struct resource));
492            sub_res->end = res->end;
493            data_resource.start = res->end + 1;
494            request_resource(res, sub_res);
495        }
496
497        if (data_resource.start >= res->start &&
498            data_resource.start <= res->end &&
499            data_resource.end <= res->end)
500            request_resource(res, &data_resource);
501    }
502}
503
504unsigned long real_memory_size;
505EXPORT_SYMBOL_GPL(real_memory_size);
506
507static void __init setup_memory_end(void)
508{
509    unsigned long memory_size;
510    unsigned long max_mem;
511    int i;
512
513#ifdef CONFIG_ZFCPDUMP
514    if (ipl_info.type == IPL_TYPE_FCP_DUMP) {
515        memory_end = ZFCPDUMP_HSA_SIZE;
516        memory_end_set = 1;
517    }
518#endif
519    memory_size = 0;
520    memory_end &= PAGE_MASK;
521
522    max_mem = memory_end ? min(VMEM_MAX_PHYS, memory_end) : VMEM_MAX_PHYS;
523    memory_end = min(max_mem, memory_end);
524
525    /*
526     * Make sure all chunks are MAX_ORDER aligned so we don't need the
527     * extra checks that HOLES_IN_ZONE would require.
528     */
529    for (i = 0; i < MEMORY_CHUNKS; i++) {
530        unsigned long start, end;
531        struct mem_chunk *chunk;
532        unsigned long align;
533
534        chunk = &memory_chunk[i];
535        align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1);
536        start = (chunk->addr + align - 1) & ~(align - 1);
537        end = (chunk->addr + chunk->size) & ~(align - 1);
538        if (start >= end)
539            memset(chunk, 0, sizeof(*chunk));
540        else {
541            chunk->addr = start;
542            chunk->size = end - start;
543        }
544    }
545
546    for (i = 0; i < MEMORY_CHUNKS; i++) {
547        struct mem_chunk *chunk = &memory_chunk[i];
548
549        real_memory_size = max(real_memory_size,
550                       chunk->addr + chunk->size);
551        if (chunk->addr >= max_mem) {
552            memset(chunk, 0, sizeof(*chunk));
553            continue;
554        }
555        if (chunk->addr + chunk->size > max_mem)
556            chunk->size = max_mem - chunk->addr;
557        memory_size = max(memory_size, chunk->addr + chunk->size);
558    }
559    if (!memory_end)
560        memory_end = memory_size;
561}
562
563static void __init
564setup_memory(void)
565{
566        unsigned long bootmap_size;
567    unsigned long start_pfn, end_pfn;
568    int i;
569
570    /*
571     * partially used pages are not usable - thus
572     * we are rounding upwards:
573     */
574    start_pfn = PFN_UP(__pa(&_end));
575    end_pfn = max_pfn = PFN_DOWN(memory_end);
576
577#ifdef CONFIG_BLK_DEV_INITRD
578    /*
579     * Move the initrd in case the bitmap of the bootmem allocater
580     * would overwrite it.
581     */
582
583    if (INITRD_START && INITRD_SIZE) {
584        unsigned long bmap_size;
585        unsigned long start;
586
587        bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
588        bmap_size = PFN_PHYS(bmap_size);
589
590        if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
591            start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
592
593            if (start + INITRD_SIZE > memory_end) {
594                pr_err("initrd extends beyond end of "
595                       "memory (0x%08lx > 0x%08lx) "
596                       "disabling initrd\n",
597                       start + INITRD_SIZE, memory_end);
598                INITRD_START = INITRD_SIZE = 0;
599            } else {
600                pr_info("Moving initrd (0x%08lx -> "
601                    "0x%08lx, size: %ld)\n",
602                    INITRD_START, start, INITRD_SIZE);
603                memmove((void *) start, (void *) INITRD_START,
604                    INITRD_SIZE);
605                INITRD_START = start;
606            }
607        }
608    }
609#endif
610
611    /*
612     * Initialize the boot-time allocator
613     */
614    bootmap_size = init_bootmem(start_pfn, end_pfn);
615
616    /*
617     * Register RAM areas with the bootmem allocator.
618     */
619
620    for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
621        unsigned long start_chunk, end_chunk, pfn;
622
623        if (memory_chunk[i].type != CHUNK_READ_WRITE)
624            continue;
625        start_chunk = PFN_DOWN(memory_chunk[i].addr);
626        end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size);
627        end_chunk = min(end_chunk, end_pfn);
628        if (start_chunk >= end_chunk)
629            continue;
630        add_active_range(0, start_chunk, end_chunk);
631        pfn = max(start_chunk, start_pfn);
632        for (; pfn < end_chunk; pfn++)
633            page_set_storage_key(PFN_PHYS(pfn),
634                         PAGE_DEFAULT_KEY, 0);
635    }
636
637    psw_set_key(PAGE_DEFAULT_KEY);
638
639    free_bootmem_with_active_regions(0, max_pfn);
640
641    /*
642     * Reserve memory used for lowcore/command line/kernel image.
643     */
644    reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT);
645    reserve_bootmem((unsigned long)_stext,
646            PFN_PHYS(start_pfn) - (unsigned long)_stext,
647            BOOTMEM_DEFAULT);
648    /*
649     * Reserve the bootmem bitmap itself as well. We do this in two
650     * steps (first step was init_bootmem()) because this catches
651     * the (very unlikely) case of us accidentally initializing the
652     * bootmem allocator with an invalid RAM area.
653     */
654    reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size,
655            BOOTMEM_DEFAULT);
656
657#ifdef CONFIG_BLK_DEV_INITRD
658    if (INITRD_START && INITRD_SIZE) {
659        if (INITRD_START + INITRD_SIZE <= memory_end) {
660            reserve_bootmem(INITRD_START, INITRD_SIZE,
661                    BOOTMEM_DEFAULT);
662            initrd_start = INITRD_START;
663            initrd_end = initrd_start + INITRD_SIZE;
664        } else {
665            pr_err("initrd extends beyond end of "
666                   "memory (0x%08lx > 0x%08lx) "
667                   "disabling initrd\n",
668                   initrd_start + INITRD_SIZE, memory_end);
669            initrd_start = initrd_end = 0;
670        }
671    }
672#endif
673}
674
675/*
676 * Setup hardware capabilities.
677 */
678static void __init setup_hwcaps(void)
679{
680    static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
681    struct cpuid cpu_id;
682    int i;
683
684    /*
685     * The store facility list bits numbers as found in the principles
686     * of operation are numbered with bit 1UL<<31 as number 0 to
687     * bit 1UL<<0 as number 31.
688     * Bit 0: instructions named N3, "backported" to esa-mode
689     * Bit 2: z/Architecture mode is active
690     * Bit 7: the store-facility-list-extended facility is installed
691     * Bit 17: the message-security assist is installed
692     * Bit 19: the long-displacement facility is installed
693     * Bit 21: the extended-immediate facility is installed
694     * Bit 22: extended-translation facility 3 is installed
695     * Bit 30: extended-translation facility 3 enhancement facility
696     * These get translated to:
697     * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
698     * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
699     * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
700     * HWCAP_S390_ETF3EH bit 8 (22 && 30).
701     */
702    for (i = 0; i < 6; i++)
703        if (test_facility(stfl_bits[i]))
704            elf_hwcap |= 1UL << i;
705
706    if (test_facility(22) && test_facility(30))
707        elf_hwcap |= HWCAP_S390_ETF3EH;
708
709    /*
710     * Check for additional facilities with store-facility-list-extended.
711     * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
712     * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
713     * as stored by stfl, bits 32-xxx contain additional facilities.
714     * How many facility words are stored depends on the number of
715     * doublewords passed to the instruction. The additional facilites
716     * are:
717     * Bit 42: decimal floating point facility is installed
718     * Bit 44: perform floating point operation facility is installed
719     * translated to:
720     * HWCAP_S390_DFP bit 6 (42 && 44).
721     */
722    if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
723        elf_hwcap |= HWCAP_S390_DFP;
724
725    /*
726     * Huge page support HWCAP_S390_HPAGE is bit 7.
727     */
728    if (MACHINE_HAS_HPAGE)
729        elf_hwcap |= HWCAP_S390_HPAGE;
730
731    /*
732     * 64-bit register support for 31-bit processes
733     * HWCAP_S390_HIGH_GPRS is bit 9.
734     */
735    elf_hwcap |= HWCAP_S390_HIGH_GPRS;
736
737    get_cpu_id(&cpu_id);
738    switch (cpu_id.machine) {
739    case 0x9672:
740#if !defined(CONFIG_64BIT)
741    default: /* Use "g5" as default for 31 bit kernels. */
742#endif
743        strcpy(elf_platform, "g5");
744        break;
745    case 0x2064:
746    case 0x2066:
747#if defined(CONFIG_64BIT)
748    default: /* Use "z900" as default for 64 bit kernels. */
749#endif
750        strcpy(elf_platform, "z900");
751        break;
752    case 0x2084:
753    case 0x2086:
754        strcpy(elf_platform, "z990");
755        break;
756    case 0x2094:
757    case 0x2096:
758        strcpy(elf_platform, "z9-109");
759        break;
760    case 0x2097:
761    case 0x2098:
762        strcpy(elf_platform, "z10");
763        break;
764    case 0x2817:
765        strcpy(elf_platform, "z196");
766        break;
767    }
768}
769
770/*
771 * Setup function called from init/main.c just after the banner
772 * was printed.
773 */
774
775void __init
776setup_arch(char **cmdline_p)
777{
778        /*
779         * print what head.S has found out about the machine
780         */
781#ifndef CONFIG_64BIT
782    if (MACHINE_IS_VM)
783        pr_info("Linux is running as a z/VM "
784            "guest operating system in 31-bit mode\n");
785    else if (MACHINE_IS_LPAR)
786        pr_info("Linux is running natively in 31-bit mode\n");
787    if (MACHINE_HAS_IEEE)
788        pr_info("The hardware system has IEEE compatible "
789            "floating point units\n");
790    else
791        pr_info("The hardware system has no IEEE compatible "
792            "floating point units\n");
793#else /* CONFIG_64BIT */
794    if (MACHINE_IS_VM)
795        pr_info("Linux is running as a z/VM "
796            "guest operating system in 64-bit mode\n");
797    else if (MACHINE_IS_KVM)
798        pr_info("Linux is running under KVM in 64-bit mode\n");
799    else if (MACHINE_IS_LPAR)
800        pr_info("Linux is running natively in 64-bit mode\n");
801#endif /* CONFIG_64BIT */
802
803    /* Have one command line that is parsed and saved in /proc/cmdline */
804    /* boot_command_line has been already set up in early.c */
805    *cmdline_p = boot_command_line;
806
807        ROOT_DEV = Root_RAM0;
808
809    init_mm.start_code = PAGE_OFFSET;
810    init_mm.end_code = (unsigned long) &_etext;
811    init_mm.end_data = (unsigned long) &_edata;
812    init_mm.brk = (unsigned long) &_end;
813
814    if (MACHINE_HAS_MVCOS)
815        memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
816    else
817        memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
818
819    parse_early_param();
820
821    setup_ipl();
822    setup_memory_end();
823    setup_addressing_mode();
824    setup_memory();
825    setup_resources();
826    setup_lowcore();
827
828        cpu_init();
829    s390_init_cpu_topology();
830
831    /*
832     * Setup capabilities (ELF_HWCAP & ELF_PLATFORM).
833     */
834    setup_hwcaps();
835
836    /*
837     * Create kernel page tables and switch to virtual addressing.
838     */
839        paging_init();
840
841        /* Setup default console */
842    conmode_default();
843    set_preferred_console();
844
845    /* Setup zfcpdump support */
846    setup_zfcpdump(console_devno);
847}
848

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