2 * arch/s390/kernel/setup.c
5 * Copyright (C) IBM Corp. 1999,2010
6 * Author(s): Hartmut Penner (hp@de.ibm.com),
7 * Martin Schwidefsky (schwidefsky@de.ibm.com)
9 * Derived from "arch/i386/kernel/setup.c"
10 * Copyright (C) 1995, Linus Torvalds
14 * This file handles the architecture-dependent parts of initialization
17 #define KMSG_COMPONENT "setup"
18 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
20 #include <linux/errno.h>
21 #include <linux/module.h>
22 #include <linux/sched.h>
23 #include <linux/kernel.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>
47 #include <asm/uaccess.h>
48 #include <asm/system.h>
50 #include <asm/mmu_context.h>
51 #include <asm/cpcmd.h>
52 #include <asm/lowcore.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>
61 long psw_kernel_bits
= (PSW_BASE_BITS
| PSW_MASK_DAT
| PSW_ASC_PRIMARY
|
62 PSW_MASK_MCHECK
| PSW_DEFAULT_KEY
);
63 long 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
);
68 * User copy operations.
70 struct uaccess_ops uaccess
;
71 EXPORT_SYMBOL(uaccess
);
76 unsigned int console_mode
= 0;
77 EXPORT_SYMBOL(console_mode
);
79 unsigned int console_devno
= -1;
80 EXPORT_SYMBOL(console_devno
);
82 unsigned int console_irq
= -1;
83 EXPORT_SYMBOL(console_irq
);
85 unsigned long elf_hwcap
= 0;
86 char elf_platform
[ELF_PLATFORM_SIZE
];
88 struct mem_chunk __initdata memory_chunk
[MEMORY_CHUNKS
];
90 int __initdata memory_end_set
;
91 unsigned long __initdata memory_end
;
93 /* An array with a pointer to the lowcore of every CPU. */
94 struct _lowcore
*lowcore_ptr
[NR_CPUS
];
95 EXPORT_SYMBOL(lowcore_ptr
);
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 ...
103 #include <asm/setup.h>
106 * condev= and conmode= setup parameter.
109 static int __init
condev_setup(char *str
)
113 vdev
= simple_strtoul(str
, &str
, 0);
114 if (vdev
>= 0 && vdev
< 65536) {
115 console_devno
= vdev
;
121 __setup("condev=", condev_setup
);
123 static void __init
set_preferred_console(void)
126 add_preferred_console("hvc", 0, NULL
);
127 else if (CONSOLE_IS_3215
|| CONSOLE_IS_SCLP
)
128 add_preferred_console("ttyS", 0, NULL
);
129 else if (CONSOLE_IS_3270
)
130 add_preferred_console("tty3270", 0, NULL
);
133 static int __init
conmode_setup(char *str
)
135 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
136 if (strncmp(str
, "hwc", 4) == 0 || strncmp(str
, "sclp", 5) == 0)
139 #if defined(CONFIG_TN3215_CONSOLE)
140 if (strncmp(str
, "3215", 5) == 0)
143 #if defined(CONFIG_TN3270_CONSOLE)
144 if (strncmp(str
, "3270", 5) == 0)
147 set_preferred_console();
151 __setup("conmode=", conmode_setup
);
153 static void __init
conmode_default(void)
155 char query_buffer
[1024];
159 cpcmd("QUERY CONSOLE", query_buffer
, 1024, NULL
);
160 console_devno
= simple_strtoul(query_buffer
+ 5, NULL
, 16);
161 ptr
= strstr(query_buffer
, "SUBCHANNEL =");
162 console_irq
= simple_strtoul(ptr
+ 13, NULL
, 16);
163 cpcmd("QUERY TERM", query_buffer
, 1024, NULL
);
164 ptr
= strstr(query_buffer
, "CONMODE");
166 * Set the conmode to 3215 so that the device recognition
167 * will set the cu_type of the console to 3215. If the
168 * conmode is 3270 and we don't set it back then both
169 * 3215 and the 3270 driver will try to access the console
170 * device (3215 as console and 3270 as normal tty).
172 cpcmd("TERM CONMODE 3215", NULL
, 0, NULL
);
174 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
179 if (strncmp(ptr
+ 8, "3270", 4) == 0) {
180 #if defined(CONFIG_TN3270_CONSOLE)
182 #elif defined(CONFIG_TN3215_CONSOLE)
184 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
187 } else if (strncmp(ptr
+ 8, "3215", 4) == 0) {
188 #if defined(CONFIG_TN3215_CONSOLE)
190 #elif defined(CONFIG_TN3270_CONSOLE)
192 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
197 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
203 #ifdef CONFIG_ZFCPDUMP
204 static void __init
setup_zfcpdump(unsigned int console_devno
)
208 if (ipl_info
.type
!= IPL_TYPE_FCP_DUMP
)
210 if (console_devno
!= -1)
211 sprintf(str
, " cio_ignore=all,!0.0.%04x,!0.0.%04x",
212 ipl_info
.data
.fcp
.dev_id
.devno
, console_devno
);
214 sprintf(str
, " cio_ignore=all,!0.0.%04x",
215 ipl_info
.data
.fcp
.dev_id
.devno
);
216 strcat(boot_command_line
, str
);
217 console_loglevel
= 2;
220 static inline void setup_zfcpdump(unsigned int console_devno
) {}
221 #endif /* CONFIG_ZFCPDUMP */
224 * Reboot, halt and power_off stubs. They just call _machine_restart,
225 * _machine_halt or _machine_power_off.
228 void machine_restart(char *command
)
230 if ((!in_interrupt() && !in_atomic()) || oops_in_progress
)
232 * Only unblank the console if we are called in enabled
233 * context or a bust_spinlocks cleared the way for us.
236 _machine_restart(command
);
239 void machine_halt(void)
241 if (!in_interrupt() || oops_in_progress
)
243 * Only unblank the console if we are called in enabled
244 * context or a bust_spinlocks cleared the way for us.
250 void machine_power_off(void)
252 if (!in_interrupt() || oops_in_progress
)
254 * Only unblank the console if we are called in enabled
255 * context or a bust_spinlocks cleared the way for us.
258 _machine_power_off();
262 * Dummy power off function.
264 void (*pm_power_off
)(void) = machine_power_off
;
266 static int __init
early_parse_mem(char *p
)
268 memory_end
= memparse(p
, &p
);
272 early_param("mem", early_parse_mem
);
274 unsigned int user_mode
= HOME_SPACE_MODE
;
275 EXPORT_SYMBOL_GPL(user_mode
);
277 static int set_amode_and_uaccess(unsigned long user_amode
,
278 unsigned long user32_amode
)
280 psw_user_bits
= PSW_BASE_BITS
| PSW_MASK_DAT
| user_amode
|
281 PSW_MASK_IO
| PSW_MASK_EXT
| PSW_MASK_MCHECK
|
282 PSW_MASK_PSTATE
| PSW_DEFAULT_KEY
;
284 psw_user32_bits
= PSW_BASE32_BITS
| PSW_MASK_DAT
| user_amode
|
285 PSW_MASK_IO
| PSW_MASK_EXT
| PSW_MASK_MCHECK
|
286 PSW_MASK_PSTATE
| PSW_DEFAULT_KEY
;
287 psw32_user_bits
= PSW32_BASE_BITS
| PSW32_MASK_DAT
| user32_amode
|
288 PSW32_MASK_IO
| PSW32_MASK_EXT
| PSW32_MASK_MCHECK
|
291 psw_kernel_bits
= PSW_BASE_BITS
| PSW_MASK_DAT
| PSW_ASC_HOME
|
292 PSW_MASK_MCHECK
| PSW_DEFAULT_KEY
;
294 if (MACHINE_HAS_MVCOS
) {
295 memcpy(&uaccess
, &uaccess_mvcos_switch
, sizeof(uaccess
));
298 memcpy(&uaccess
, &uaccess_pt
, sizeof(uaccess
));
304 * Switch kernel/user addressing modes?
306 static int __init
early_parse_switch_amode(char *p
)
308 user_mode
= PRIMARY_SPACE_MODE
;
311 early_param("switch_amode", early_parse_switch_amode
);
313 static int __init
early_parse_user_mode(char *p
)
315 if (p
&& strcmp(p
, "primary") == 0)
316 user_mode
= PRIMARY_SPACE_MODE
;
317 else if (!p
|| strcmp(p
, "home") == 0)
318 user_mode
= HOME_SPACE_MODE
;
323 early_param("user_mode", early_parse_user_mode
);
325 static void setup_addressing_mode(void)
327 if (user_mode
== PRIMARY_SPACE_MODE
) {
328 if (set_amode_and_uaccess(PSW_ASC_PRIMARY
, PSW32_ASC_PRIMARY
))
329 pr_info("Address spaces switched, "
330 "mvcos available\n");
332 pr_info("Address spaces switched, "
333 "mvcos not available\n");
343 * Setup lowcore for boot cpu
345 BUILD_BUG_ON(sizeof(struct _lowcore
) != LC_PAGES
* 4096);
346 lc
= __alloc_bootmem_low(LC_PAGES
* PAGE_SIZE
, LC_PAGES
* PAGE_SIZE
, 0);
347 lc
->restart_psw
.mask
= PSW_BASE_BITS
| PSW_DEFAULT_KEY
;
348 lc
->restart_psw
.addr
=
349 PSW_ADDR_AMODE
| (unsigned long) restart_int_handler
;
350 if (user_mode
!= HOME_SPACE_MODE
)
351 lc
->restart_psw
.mask
|= PSW_ASC_HOME
;
352 lc
->external_new_psw
.mask
= psw_kernel_bits
;
353 lc
->external_new_psw
.addr
=
354 PSW_ADDR_AMODE
| (unsigned long) ext_int_handler
;
355 lc
->svc_new_psw
.mask
= psw_kernel_bits
| PSW_MASK_IO
| PSW_MASK_EXT
;
356 lc
->svc_new_psw
.addr
= PSW_ADDR_AMODE
| (unsigned long) system_call
;
357 lc
->program_new_psw
.mask
= psw_kernel_bits
;
358 lc
->program_new_psw
.addr
=
359 PSW_ADDR_AMODE
| (unsigned long)pgm_check_handler
;
360 lc
->mcck_new_psw
.mask
=
361 psw_kernel_bits
& ~PSW_MASK_MCHECK
& ~PSW_MASK_DAT
;
362 lc
->mcck_new_psw
.addr
=
363 PSW_ADDR_AMODE
| (unsigned long) mcck_int_handler
;
364 lc
->io_new_psw
.mask
= psw_kernel_bits
;
365 lc
->io_new_psw
.addr
= PSW_ADDR_AMODE
| (unsigned long) io_int_handler
;
366 lc
->clock_comparator
= -1ULL;
367 lc
->kernel_stack
= ((unsigned long) &init_thread_union
) + THREAD_SIZE
;
368 lc
->async_stack
= (unsigned long)
369 __alloc_bootmem(ASYNC_SIZE
, ASYNC_SIZE
, 0) + ASYNC_SIZE
;
370 lc
->panic_stack
= (unsigned long)
371 __alloc_bootmem(PAGE_SIZE
, PAGE_SIZE
, 0) + PAGE_SIZE
;
372 lc
->current_task
= (unsigned long) init_thread_union
.thread_info
.task
;
373 lc
->thread_info
= (unsigned long) &init_thread_union
;
374 lc
->machine_flags
= S390_lowcore
.machine_flags
;
375 lc
->stfl_fac_list
= S390_lowcore
.stfl_fac_list
;
376 memcpy(lc
->stfle_fac_list
, S390_lowcore
.stfle_fac_list
,
379 if (MACHINE_HAS_IEEE
) {
380 lc
->extended_save_area_addr
= (__u32
)
381 __alloc_bootmem_low(PAGE_SIZE
, PAGE_SIZE
, 0);
382 /* enable extended save area */
383 __ctl_set_bit(14, 29);
387 lc
->vdso_per_cpu_data
= (unsigned long) &lc
->paste
[0];
389 lc
->sync_enter_timer
= S390_lowcore
.sync_enter_timer
;
390 lc
->async_enter_timer
= S390_lowcore
.async_enter_timer
;
391 lc
->exit_timer
= S390_lowcore
.exit_timer
;
392 lc
->user_timer
= S390_lowcore
.user_timer
;
393 lc
->system_timer
= S390_lowcore
.system_timer
;
394 lc
->steal_timer
= S390_lowcore
.steal_timer
;
395 lc
->last_update_timer
= S390_lowcore
.last_update_timer
;
396 lc
->last_update_clock
= S390_lowcore
.last_update_clock
;
397 lc
->ftrace_func
= S390_lowcore
.ftrace_func
;
398 set_prefix((u32
)(unsigned long) lc
);
402 static struct resource code_resource
= {
403 .name
= "Kernel code",
404 .flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
,
407 static struct resource data_resource
= {
408 .name
= "Kernel data",
409 .flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
,
412 static struct resource bss_resource
= {
413 .name
= "Kernel bss",
414 .flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
,
417 static struct resource __initdata
*standard_resources
[] = {
423 static void __init
setup_resources(void)
425 struct resource
*res
, *std_res
, *sub_res
;
428 code_resource
.start
= (unsigned long) &_text
;
429 code_resource
.end
= (unsigned long) &_etext
- 1;
430 data_resource
.start
= (unsigned long) &_etext
;
431 data_resource
.end
= (unsigned long) &_edata
- 1;
432 bss_resource
.start
= (unsigned long) &__bss_start
;
433 bss_resource
.end
= (unsigned long) &__bss_stop
- 1;
435 for (i
= 0; i
< MEMORY_CHUNKS
; i
++) {
436 if (!memory_chunk
[i
].size
)
438 res
= alloc_bootmem_low(sizeof(*res
));
439 res
->flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
;
440 switch (memory_chunk
[i
].type
) {
441 case CHUNK_READ_WRITE
:
442 res
->name
= "System RAM";
444 case CHUNK_READ_ONLY
:
445 res
->name
= "System ROM";
446 res
->flags
|= IORESOURCE_READONLY
;
449 res
->name
= "reserved";
451 res
->start
= memory_chunk
[i
].addr
;
452 res
->end
= res
->start
+ memory_chunk
[i
].size
- 1;
453 request_resource(&iomem_resource
, res
);
455 for (j
= 0; j
< ARRAY_SIZE(standard_resources
); j
++) {
456 std_res
= standard_resources
[j
];
457 if (std_res
->start
< res
->start
||
458 std_res
->start
> res
->end
)
460 if (std_res
->end
> res
->end
) {
461 sub_res
= alloc_bootmem_low(sizeof(*sub_res
));
463 sub_res
->end
= res
->end
;
464 std_res
->start
= res
->end
+ 1;
465 request_resource(res
, sub_res
);
467 request_resource(res
, std_res
);
473 unsigned long real_memory_size
;
474 EXPORT_SYMBOL_GPL(real_memory_size
);
476 static void __init
setup_memory_end(void)
478 unsigned long memory_size
;
479 unsigned long max_mem
;
482 #ifdef CONFIG_ZFCPDUMP
483 if (ipl_info
.type
== IPL_TYPE_FCP_DUMP
) {
484 memory_end
= ZFCPDUMP_HSA_SIZE
;
489 memory_end
&= PAGE_MASK
;
491 max_mem
= memory_end
? min(VMEM_MAX_PHYS
, memory_end
) : VMEM_MAX_PHYS
;
492 memory_end
= min(max_mem
, memory_end
);
495 * Make sure all chunks are MAX_ORDER aligned so we don't need the
496 * extra checks that HOLES_IN_ZONE would require.
498 for (i
= 0; i
< MEMORY_CHUNKS
; i
++) {
499 unsigned long start
, end
;
500 struct mem_chunk
*chunk
;
503 chunk
= &memory_chunk
[i
];
504 align
= 1UL << (MAX_ORDER
+ PAGE_SHIFT
- 1);
505 start
= (chunk
->addr
+ align
- 1) & ~(align
- 1);
506 end
= (chunk
->addr
+ chunk
->size
) & ~(align
- 1);
508 memset(chunk
, 0, sizeof(*chunk
));
511 chunk
->size
= end
- start
;
515 for (i
= 0; i
< MEMORY_CHUNKS
; i
++) {
516 struct mem_chunk
*chunk
= &memory_chunk
[i
];
518 real_memory_size
= max(real_memory_size
,
519 chunk
->addr
+ chunk
->size
);
520 if (chunk
->addr
>= max_mem
) {
521 memset(chunk
, 0, sizeof(*chunk
));
524 if (chunk
->addr
+ chunk
->size
> max_mem
)
525 chunk
->size
= max_mem
- chunk
->addr
;
526 memory_size
= max(memory_size
, chunk
->addr
+ chunk
->size
);
529 memory_end
= memory_size
;
535 unsigned long bootmap_size
;
536 unsigned long start_pfn
, end_pfn
;
540 * partially used pages are not usable - thus
541 * we are rounding upwards:
543 start_pfn
= PFN_UP(__pa(&_end
));
544 end_pfn
= max_pfn
= PFN_DOWN(memory_end
);
546 #ifdef CONFIG_BLK_DEV_INITRD
548 * Move the initrd in case the bitmap of the bootmem allocater
549 * would overwrite it.
552 if (INITRD_START
&& INITRD_SIZE
) {
553 unsigned long bmap_size
;
556 bmap_size
= bootmem_bootmap_pages(end_pfn
- start_pfn
+ 1);
557 bmap_size
= PFN_PHYS(bmap_size
);
559 if (PFN_PHYS(start_pfn
) + bmap_size
> INITRD_START
) {
560 start
= PFN_PHYS(start_pfn
) + bmap_size
+ PAGE_SIZE
;
562 if (start
+ INITRD_SIZE
> memory_end
) {
563 pr_err("initrd extends beyond end of "
564 "memory (0x%08lx > 0x%08lx) "
565 "disabling initrd\n",
566 start
+ INITRD_SIZE
, memory_end
);
567 INITRD_START
= INITRD_SIZE
= 0;
569 pr_info("Moving initrd (0x%08lx -> "
570 "0x%08lx, size: %ld)\n",
571 INITRD_START
, start
, INITRD_SIZE
);
572 memmove((void *) start
, (void *) INITRD_START
,
574 INITRD_START
= start
;
581 * Initialize the boot-time allocator
583 bootmap_size
= init_bootmem(start_pfn
, end_pfn
);
586 * Register RAM areas with the bootmem allocator.
589 for (i
= 0; i
< MEMORY_CHUNKS
&& memory_chunk
[i
].size
> 0; i
++) {
590 unsigned long start_chunk
, end_chunk
, pfn
;
592 if (memory_chunk
[i
].type
!= CHUNK_READ_WRITE
)
594 start_chunk
= PFN_DOWN(memory_chunk
[i
].addr
);
595 end_chunk
= start_chunk
+ PFN_DOWN(memory_chunk
[i
].size
);
596 end_chunk
= min(end_chunk
, end_pfn
);
597 if (start_chunk
>= end_chunk
)
599 add_active_range(0, start_chunk
, end_chunk
);
600 pfn
= max(start_chunk
, start_pfn
);
601 for (; pfn
< end_chunk
; pfn
++)
602 page_set_storage_key(PFN_PHYS(pfn
),
603 PAGE_DEFAULT_KEY
, 0);
606 psw_set_key(PAGE_DEFAULT_KEY
);
608 free_bootmem_with_active_regions(0, max_pfn
);
611 * Reserve memory used for lowcore/command line/kernel image.
613 reserve_bootmem(0, (unsigned long)_ehead
, BOOTMEM_DEFAULT
);
614 reserve_bootmem((unsigned long)_stext
,
615 PFN_PHYS(start_pfn
) - (unsigned long)_stext
,
618 * Reserve the bootmem bitmap itself as well. We do this in two
619 * steps (first step was init_bootmem()) because this catches
620 * the (very unlikely) case of us accidentally initializing the
621 * bootmem allocator with an invalid RAM area.
623 reserve_bootmem(start_pfn
<< PAGE_SHIFT
, bootmap_size
,
626 #ifdef CONFIG_BLK_DEV_INITRD
627 if (INITRD_START
&& INITRD_SIZE
) {
628 if (INITRD_START
+ INITRD_SIZE
<= memory_end
) {
629 reserve_bootmem(INITRD_START
, INITRD_SIZE
,
631 initrd_start
= INITRD_START
;
632 initrd_end
= initrd_start
+ INITRD_SIZE
;
634 pr_err("initrd extends beyond end of "
635 "memory (0x%08lx > 0x%08lx) "
636 "disabling initrd\n",
637 initrd_start
+ INITRD_SIZE
, memory_end
);
638 initrd_start
= initrd_end
= 0;
645 * Setup hardware capabilities.
647 static void __init
setup_hwcaps(void)
649 static const int stfl_bits
[6] = { 0, 2, 7, 17, 19, 21 };
654 * The store facility list bits numbers as found in the principles
655 * of operation are numbered with bit 1UL<<31 as number 0 to
656 * bit 1UL<<0 as number 31.
657 * Bit 0: instructions named N3, "backported" to esa-mode
658 * Bit 2: z/Architecture mode is active
659 * Bit 7: the store-facility-list-extended facility is installed
660 * Bit 17: the message-security assist is installed
661 * Bit 19: the long-displacement facility is installed
662 * Bit 21: the extended-immediate facility is installed
663 * Bit 22: extended-translation facility 3 is installed
664 * Bit 30: extended-translation facility 3 enhancement facility
665 * These get translated to:
666 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
667 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
668 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
669 * HWCAP_S390_ETF3EH bit 8 (22 && 30).
671 for (i
= 0; i
< 6; i
++)
672 if (test_facility(stfl_bits
[i
]))
673 elf_hwcap
|= 1UL << i
;
675 if (test_facility(22) && test_facility(30))
676 elf_hwcap
|= HWCAP_S390_ETF3EH
;
679 * Check for additional facilities with store-facility-list-extended.
680 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
681 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
682 * as stored by stfl, bits 32-xxx contain additional facilities.
683 * How many facility words are stored depends on the number of
684 * doublewords passed to the instruction. The additional facilities
686 * Bit 42: decimal floating point facility is installed
687 * Bit 44: perform floating point operation facility is installed
689 * HWCAP_S390_DFP bit 6 (42 && 44).
691 if ((elf_hwcap
& (1UL << 2)) && test_facility(42) && test_facility(44))
692 elf_hwcap
|= HWCAP_S390_DFP
;
695 * Huge page support HWCAP_S390_HPAGE is bit 7.
697 if (MACHINE_HAS_HPAGE
)
698 elf_hwcap
|= HWCAP_S390_HPAGE
;
701 * 64-bit register support for 31-bit processes
702 * HWCAP_S390_HIGH_GPRS is bit 9.
704 elf_hwcap
|= HWCAP_S390_HIGH_GPRS
;
707 switch (cpu_id
.machine
) {
709 #if !defined(CONFIG_64BIT)
710 default: /* Use "g5" as default for 31 bit kernels. */
712 strcpy(elf_platform
, "g5");
716 #if defined(CONFIG_64BIT)
717 default: /* Use "z900" as default for 64 bit kernels. */
719 strcpy(elf_platform
, "z900");
723 strcpy(elf_platform
, "z990");
727 strcpy(elf_platform
, "z9-109");
731 strcpy(elf_platform
, "z10");
734 strcpy(elf_platform
, "z196");
740 * Setup function called from init/main.c just after the banner
745 setup_arch(char **cmdline_p
)
748 * print what head.S has found out about the machine
752 pr_info("Linux is running as a z/VM "
753 "guest operating system in 31-bit mode\n");
754 else if (MACHINE_IS_LPAR
)
755 pr_info("Linux is running natively in 31-bit mode\n");
756 if (MACHINE_HAS_IEEE
)
757 pr_info("The hardware system has IEEE compatible "
758 "floating point units\n");
760 pr_info("The hardware system has no IEEE compatible "
761 "floating point units\n");
762 #else /* CONFIG_64BIT */
764 pr_info("Linux is running as a z/VM "
765 "guest operating system in 64-bit mode\n");
766 else if (MACHINE_IS_KVM
)
767 pr_info("Linux is running under KVM in 64-bit mode\n");
768 else if (MACHINE_IS_LPAR
)
769 pr_info("Linux is running natively in 64-bit mode\n");
770 #endif /* CONFIG_64BIT */
772 /* Have one command line that is parsed and saved in /proc/cmdline */
773 /* boot_command_line has been already set up in early.c */
774 *cmdline_p
= boot_command_line
;
776 ROOT_DEV
= Root_RAM0
;
778 init_mm
.start_code
= PAGE_OFFSET
;
779 init_mm
.end_code
= (unsigned long) &_etext
;
780 init_mm
.end_data
= (unsigned long) &_edata
;
781 init_mm
.brk
= (unsigned long) &_end
;
783 if (MACHINE_HAS_MVCOS
)
784 memcpy(&uaccess
, &uaccess_mvcos
, sizeof(uaccess
));
786 memcpy(&uaccess
, &uaccess_std
, sizeof(uaccess
));
792 setup_addressing_mode();
798 s390_init_cpu_topology();
801 * Setup capabilities (ELF_HWCAP & ELF_PLATFORM).
806 * Create kernel page tables and switch to virtual addressing.
810 /* Setup default console */
812 set_preferred_console();
814 /* Setup zfcpdump support */
815 setup_zfcpdump(console_devno
);