2 * arch/s390/kernel/setup.c
5 * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
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/slab.h>
29 #include <linux/user.h>
30 #include <linux/tty.h>
31 #include <linux/ioport.h>
32 #include <linux/delay.h>
33 #include <linux/init.h>
34 #include <linux/initrd.h>
35 #include <linux/bootmem.h>
36 #include <linux/root_dev.h>
37 #include <linux/console.h>
38 #include <linux/kernel_stat.h>
39 #include <linux/device.h>
40 #include <linux/notifier.h>
41 #include <linux/pfn.h>
42 #include <linux/ctype.h>
43 #include <linux/reboot.h>
44 #include <linux/topology.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 unsigned int console_devno
= -1;
78 unsigned int console_irq
= -1;
79 unsigned long machine_flags
;
80 unsigned long elf_hwcap
= 0;
81 char elf_platform
[ELF_PLATFORM_SIZE
];
83 struct mem_chunk __initdata memory_chunk
[MEMORY_CHUNKS
];
84 volatile int __cpu_logical_map
[NR_CPUS
]; /* logical cpu to cpu address */
86 int __initdata memory_end_set
;
87 unsigned long __initdata memory_end
;
90 * This is set up by the setup-routine at boot-time
91 * for S390 need to find out, what we have to setup
92 * using address 0x10400 ...
95 #include <asm/setup.h>
97 static struct resource code_resource
= {
98 .name
= "Kernel code",
99 .flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
,
102 static struct resource data_resource
= {
103 .name
= "Kernel data",
104 .flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
,
108 * cpu_init() initializes state that is per-CPU.
110 void __cpuinit
cpu_init(void)
112 int addr
= hard_smp_processor_id();
115 * Store processor id in lowcore (used e.g. in timer_interrupt)
117 get_cpu_id(&S390_lowcore
.cpu_data
.cpu_id
);
118 S390_lowcore
.cpu_data
.cpu_addr
= addr
;
121 * Force FPU initialization:
123 clear_thread_flag(TIF_USEDFPU
);
126 atomic_inc(&init_mm
.mm_count
);
127 current
->active_mm
= &init_mm
;
130 enter_lazy_tlb(&init_mm
, current
);
134 * condev= and conmode= setup parameter.
137 static int __init
condev_setup(char *str
)
141 vdev
= simple_strtoul(str
, &str
, 0);
142 if (vdev
>= 0 && vdev
< 65536) {
143 console_devno
= vdev
;
149 __setup("condev=", condev_setup
);
151 static int __init
conmode_setup(char *str
)
153 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
154 if (strncmp(str
, "hwc", 4) == 0 || strncmp(str
, "sclp", 5) == 0)
157 #if defined(CONFIG_TN3215_CONSOLE)
158 if (strncmp(str
, "3215", 5) == 0)
161 #if defined(CONFIG_TN3270_CONSOLE)
162 if (strncmp(str
, "3270", 5) == 0)
168 __setup("conmode=", conmode_setup
);
170 static void __init
conmode_default(void)
172 char query_buffer
[1024];
176 cpcmd("QUERY CONSOLE", query_buffer
, 1024, NULL
);
177 console_devno
= simple_strtoul(query_buffer
+ 5, NULL
, 16);
178 ptr
= strstr(query_buffer
, "SUBCHANNEL =");
179 console_irq
= simple_strtoul(ptr
+ 13, NULL
, 16);
180 cpcmd("QUERY TERM", query_buffer
, 1024, NULL
);
181 ptr
= strstr(query_buffer
, "CONMODE");
183 * Set the conmode to 3215 so that the device recognition
184 * will set the cu_type of the console to 3215. If the
185 * conmode is 3270 and we don't set it back then both
186 * 3215 and the 3270 driver will try to access the console
187 * device (3215 as console and 3270 as normal tty).
189 cpcmd("TERM CONMODE 3215", NULL
, 0, NULL
);
191 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
196 if (strncmp(ptr
+ 8, "3270", 4) == 0) {
197 #if defined(CONFIG_TN3270_CONSOLE)
199 #elif defined(CONFIG_TN3215_CONSOLE)
201 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
204 } else if (strncmp(ptr
+ 8, "3215", 4) == 0) {
205 #if defined(CONFIG_TN3215_CONSOLE)
207 #elif defined(CONFIG_TN3270_CONSOLE)
209 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
214 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
220 #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE)
221 static void __init
setup_zfcpdump(unsigned int console_devno
)
225 if (ipl_info
.type
!= IPL_TYPE_FCP_DUMP
)
227 if (console_devno
!= -1)
228 sprintf(str
, " cio_ignore=all,!0.0.%04x,!0.0.%04x",
229 ipl_info
.data
.fcp
.dev_id
.devno
, console_devno
);
231 sprintf(str
, " cio_ignore=all,!0.0.%04x",
232 ipl_info
.data
.fcp
.dev_id
.devno
);
233 strcat(boot_command_line
, str
);
234 console_loglevel
= 2;
237 static inline void setup_zfcpdump(unsigned int console_devno
) {}
238 #endif /* CONFIG_ZFCPDUMP */
241 * Reboot, halt and power_off stubs. They just call _machine_restart,
242 * _machine_halt or _machine_power_off.
245 void machine_restart(char *command
)
247 if ((!in_interrupt() && !in_atomic()) || oops_in_progress
)
249 * Only unblank the console if we are called in enabled
250 * context or a bust_spinlocks cleared the way for us.
253 _machine_restart(command
);
256 void machine_halt(void)
258 if (!in_interrupt() || oops_in_progress
)
260 * Only unblank the console if we are called in enabled
261 * context or a bust_spinlocks cleared the way for us.
267 void machine_power_off(void)
269 if (!in_interrupt() || oops_in_progress
)
271 * Only unblank the console if we are called in enabled
272 * context or a bust_spinlocks cleared the way for us.
275 _machine_power_off();
279 * Dummy power off function.
281 void (*pm_power_off
)(void) = machine_power_off
;
283 static int __init
early_parse_mem(char *p
)
285 memory_end
= memparse(p
, &p
);
289 early_param("mem", early_parse_mem
);
291 #ifdef CONFIG_S390_SWITCH_AMODE
293 unsigned int switch_amode
= 1;
295 unsigned int switch_amode
= 0;
297 EXPORT_SYMBOL_GPL(switch_amode
);
299 static int set_amode_and_uaccess(unsigned long user_amode
,
300 unsigned long user32_amode
)
302 psw_user_bits
= PSW_BASE_BITS
| PSW_MASK_DAT
| user_amode
|
303 PSW_MASK_IO
| PSW_MASK_EXT
| PSW_MASK_MCHECK
|
304 PSW_MASK_PSTATE
| PSW_DEFAULT_KEY
;
306 psw_user32_bits
= PSW_BASE32_BITS
| PSW_MASK_DAT
| user_amode
|
307 PSW_MASK_IO
| PSW_MASK_EXT
| PSW_MASK_MCHECK
|
308 PSW_MASK_PSTATE
| PSW_DEFAULT_KEY
;
309 psw32_user_bits
= PSW32_BASE_BITS
| PSW32_MASK_DAT
| user32_amode
|
310 PSW32_MASK_IO
| PSW32_MASK_EXT
| PSW32_MASK_MCHECK
|
313 psw_kernel_bits
= PSW_BASE_BITS
| PSW_MASK_DAT
| PSW_ASC_HOME
|
314 PSW_MASK_MCHECK
| PSW_DEFAULT_KEY
;
316 if (MACHINE_HAS_MVCOS
) {
317 memcpy(&uaccess
, &uaccess_mvcos_switch
, sizeof(uaccess
));
320 memcpy(&uaccess
, &uaccess_pt
, sizeof(uaccess
));
326 * Switch kernel/user addressing modes?
328 static int __init
early_parse_switch_amode(char *p
)
333 early_param("switch_amode", early_parse_switch_amode
);
335 #else /* CONFIG_S390_SWITCH_AMODE */
336 static inline int set_amode_and_uaccess(unsigned long user_amode
,
337 unsigned long user32_amode
)
341 #endif /* CONFIG_S390_SWITCH_AMODE */
343 #ifdef CONFIG_S390_EXEC_PROTECT
344 unsigned int s390_noexec
= 0;
345 EXPORT_SYMBOL_GPL(s390_noexec
);
348 * Enable execute protection?
350 static int __init
early_parse_noexec(char *p
)
352 if (!strncmp(p
, "off", 3))
358 early_param("noexec", early_parse_noexec
);
359 #endif /* CONFIG_S390_EXEC_PROTECT */
361 static void setup_addressing_mode(void)
364 if (set_amode_and_uaccess(PSW_ASC_SECONDARY
,
365 PSW32_ASC_SECONDARY
))
366 pr_info("Execute protection active, "
367 "mvcos available\n");
369 pr_info("Execute protection active, "
370 "mvcos not available\n");
371 } else if (switch_amode
) {
372 if (set_amode_and_uaccess(PSW_ASC_PRIMARY
, PSW32_ASC_PRIMARY
))
373 pr_info("Address spaces switched, "
374 "mvcos available\n");
376 pr_info("Address spaces switched, "
377 "mvcos not available\n");
379 #ifdef CONFIG_TRACE_IRQFLAGS
380 sysc_restore_trace_psw
.mask
= psw_kernel_bits
& ~PSW_MASK_MCHECK
;
381 io_restore_trace_psw
.mask
= psw_kernel_bits
& ~PSW_MASK_MCHECK
;
392 * Setup lowcore for boot cpu
394 lc_pages
= sizeof(void *) == 8 ? 2 : 1;
395 lc
= (struct _lowcore
*)
396 __alloc_bootmem(lc_pages
* PAGE_SIZE
, lc_pages
* PAGE_SIZE
, 0);
397 memset(lc
, 0, lc_pages
* PAGE_SIZE
);
398 lc
->restart_psw
.mask
= PSW_BASE_BITS
| PSW_DEFAULT_KEY
;
399 lc
->restart_psw
.addr
=
400 PSW_ADDR_AMODE
| (unsigned long) restart_int_handler
;
402 lc
->restart_psw
.mask
|= PSW_ASC_HOME
;
403 lc
->external_new_psw
.mask
= psw_kernel_bits
;
404 lc
->external_new_psw
.addr
=
405 PSW_ADDR_AMODE
| (unsigned long) ext_int_handler
;
406 lc
->svc_new_psw
.mask
= psw_kernel_bits
| PSW_MASK_IO
| PSW_MASK_EXT
;
407 lc
->svc_new_psw
.addr
= PSW_ADDR_AMODE
| (unsigned long) system_call
;
408 lc
->program_new_psw
.mask
= psw_kernel_bits
;
409 lc
->program_new_psw
.addr
=
410 PSW_ADDR_AMODE
| (unsigned long)pgm_check_handler
;
411 lc
->mcck_new_psw
.mask
=
412 psw_kernel_bits
& ~PSW_MASK_MCHECK
& ~PSW_MASK_DAT
;
413 lc
->mcck_new_psw
.addr
=
414 PSW_ADDR_AMODE
| (unsigned long) mcck_int_handler
;
415 lc
->io_new_psw
.mask
= psw_kernel_bits
;
416 lc
->io_new_psw
.addr
= PSW_ADDR_AMODE
| (unsigned long) io_int_handler
;
417 lc
->ipl_device
= S390_lowcore
.ipl_device
;
418 lc
->clock_comparator
= -1ULL;
419 lc
->kernel_stack
= ((unsigned long) &init_thread_union
) + THREAD_SIZE
;
420 lc
->async_stack
= (unsigned long)
421 __alloc_bootmem(ASYNC_SIZE
, ASYNC_SIZE
, 0) + ASYNC_SIZE
;
422 lc
->panic_stack
= (unsigned long)
423 __alloc_bootmem(PAGE_SIZE
, PAGE_SIZE
, 0) + PAGE_SIZE
;
424 lc
->current_task
= (unsigned long) init_thread_union
.thread_info
.task
;
425 lc
->thread_info
= (unsigned long) &init_thread_union
;
427 if (MACHINE_HAS_IEEE
) {
428 lc
->extended_save_area_addr
= (__u32
)
429 __alloc_bootmem(PAGE_SIZE
, PAGE_SIZE
, 0);
430 /* enable extended save area */
431 __ctl_set_bit(14, 29);
434 lc
->vdso_per_cpu_data
= (unsigned long) &lc
->paste
[0];
436 set_prefix((u32
)(unsigned long) lc
);
440 setup_resources(void)
442 struct resource
*res
, *sub_res
;
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;
450 for (i
= 0; i
< MEMORY_CHUNKS
; i
++) {
451 if (!memory_chunk
[i
].size
)
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";
459 case CHUNK_READ_ONLY
:
460 res
->name
= "System ROM";
461 res
->flags
|= IORESOURCE_READONLY
;
464 res
->name
= "reserved";
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
);
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
);
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
);
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
);
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
);
504 unsigned long real_memory_size
;
505 EXPORT_SYMBOL_GPL(real_memory_size
);
507 static void __init
setup_memory_end(void)
509 unsigned long memory_size
;
510 unsigned long max_mem
;
513 #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE)
514 if (ipl_info
.type
== IPL_TYPE_FCP_DUMP
) {
515 memory_end
= ZFCPDUMP_HSA_SIZE
;
520 memory_end
&= PAGE_MASK
;
522 max_mem
= memory_end
? min(VMEM_MAX_PHYS
, memory_end
) : VMEM_MAX_PHYS
;
523 memory_end
= min(max_mem
, memory_end
);
526 * Make sure all chunks are MAX_ORDER aligned so we don't need the
527 * extra checks that HOLES_IN_ZONE would require.
529 for (i
= 0; i
< MEMORY_CHUNKS
; i
++) {
530 unsigned long start
, end
;
531 struct mem_chunk
*chunk
;
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);
539 memset(chunk
, 0, sizeof(*chunk
));
542 chunk
->size
= end
- start
;
546 for (i
= 0; i
< MEMORY_CHUNKS
; i
++) {
547 struct mem_chunk
*chunk
= &memory_chunk
[i
];
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
));
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
);
560 memory_end
= memory_size
;
566 unsigned long bootmap_size
;
567 unsigned long start_pfn
, end_pfn
;
571 * partially used pages are not usable - thus
572 * we are rounding upwards:
574 start_pfn
= PFN_UP(__pa(&_end
));
575 end_pfn
= max_pfn
= PFN_DOWN(memory_end
);
577 #ifdef CONFIG_BLK_DEV_INITRD
579 * Move the initrd in case the bitmap of the bootmem allocater
580 * would overwrite it.
583 if (INITRD_START
&& INITRD_SIZE
) {
584 unsigned long bmap_size
;
587 bmap_size
= bootmem_bootmap_pages(end_pfn
- start_pfn
+ 1);
588 bmap_size
= PFN_PHYS(bmap_size
);
590 if (PFN_PHYS(start_pfn
) + bmap_size
> INITRD_START
) {
591 start
= PFN_PHYS(start_pfn
) + bmap_size
+ PAGE_SIZE
;
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;
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
,
605 INITRD_START
= start
;
612 * Initialize the boot-time allocator
614 bootmap_size
= init_bootmem(start_pfn
, end_pfn
);
617 * Register RAM areas with the bootmem allocator.
620 for (i
= 0; i
< MEMORY_CHUNKS
&& memory_chunk
[i
].size
> 0; i
++) {
621 unsigned long start_chunk
, end_chunk
, pfn
;
623 if (memory_chunk
[i
].type
!= CHUNK_READ_WRITE
)
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
)
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
), PAGE_DEFAULT_KEY
);
636 psw_set_key(PAGE_DEFAULT_KEY
);
638 free_bootmem_with_active_regions(0, max_pfn
);
641 * Reserve memory used for lowcore/command line/kernel image.
643 reserve_bootmem(0, (unsigned long)_ehead
, BOOTMEM_DEFAULT
);
644 reserve_bootmem((unsigned long)_stext
,
645 PFN_PHYS(start_pfn
) - (unsigned long)_stext
,
648 * Reserve the bootmem bitmap itself as well. We do this in two
649 * steps (first step was init_bootmem()) because this catches
650 * the (very unlikely) case of us accidentally initializing the
651 * bootmem allocator with an invalid RAM area.
653 reserve_bootmem(start_pfn
<< PAGE_SHIFT
, bootmap_size
,
656 #ifdef CONFIG_BLK_DEV_INITRD
657 if (INITRD_START
&& INITRD_SIZE
) {
658 if (INITRD_START
+ INITRD_SIZE
<= memory_end
) {
659 reserve_bootmem(INITRD_START
, INITRD_SIZE
,
661 initrd_start
= INITRD_START
;
662 initrd_end
= initrd_start
+ INITRD_SIZE
;
664 pr_err("initrd extends beyond end of "
665 "memory (0x%08lx > 0x%08lx) "
666 "disabling initrd\n",
667 initrd_start
+ INITRD_SIZE
, memory_end
);
668 initrd_start
= initrd_end
= 0;
675 * Setup hardware capabilities.
677 static void __init
setup_hwcaps(void)
679 static const int stfl_bits
[6] = { 0, 2, 7, 17, 19, 21 };
680 struct cpuinfo_S390
*cpuinfo
= &S390_lowcore
.cpu_data
;
681 unsigned long long facility_list_extended
;
682 unsigned int facility_list
;
685 facility_list
= stfl();
687 * The store facility list bits numbers as found in the principles
688 * of operation are numbered with bit 1UL<<31 as number 0 to
689 * bit 1UL<<0 as number 31.
690 * Bit 0: instructions named N3, "backported" to esa-mode
691 * Bit 2: z/Architecture mode is active
692 * Bit 7: the store-facility-list-extended facility is installed
693 * Bit 17: the message-security assist is installed
694 * Bit 19: the long-displacement facility is installed
695 * Bit 21: the extended-immediate facility is installed
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, and HWCAP_S390_EIMM bit 5.
701 for (i
= 0; i
< 6; i
++)
702 if (facility_list
& (1UL << (31 - stfl_bits
[i
])))
703 elf_hwcap
|= 1UL << i
;
706 * Check for additional facilities with store-facility-list-extended.
707 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
708 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
709 * as stored by stfl, bits 32-xxx contain additional facilities.
710 * How many facility words are stored depends on the number of
711 * doublewords passed to the instruction. The additional facilites
713 * Bit 43: decimal floating point facility is installed
715 * HWCAP_S390_DFP bit 6.
717 if ((elf_hwcap
& (1UL << 2)) &&
718 __stfle(&facility_list_extended
, 1) > 0) {
719 if (facility_list_extended
& (1ULL << (64 - 43)))
720 elf_hwcap
|= 1UL << 6;
723 if (MACHINE_HAS_HPAGE
)
724 elf_hwcap
|= 1UL << 7;
726 switch (cpuinfo
->cpu_id
.machine
) {
728 #if !defined(CONFIG_64BIT)
729 default: /* Use "g5" as default for 31 bit kernels. */
731 strcpy(elf_platform
, "g5");
735 #if defined(CONFIG_64BIT)
736 default: /* Use "z900" as default for 64 bit kernels. */
738 strcpy(elf_platform
, "z900");
742 strcpy(elf_platform
, "z990");
746 strcpy(elf_platform
, "z9-109");
750 strcpy(elf_platform
, "z10");
756 * Setup function called from init/main.c just after the banner
761 setup_arch(char **cmdline_p
)
763 /* set up preferred console */
764 add_preferred_console("ttyS", 0, NULL
);
767 * print what head.S has found out about the machine
771 pr_info("Linux is running as a z/VM "
772 "guest operating system in 31-bit mode\n");
774 pr_info("Linux is running natively in 31-bit mode\n");
775 if (MACHINE_HAS_IEEE
)
776 pr_info("The hardware system has IEEE compatible "
777 "floating point units\n");
779 pr_info("The hardware system has no IEEE compatible "
780 "floating point units\n");
781 #else /* CONFIG_64BIT */
783 pr_info("Linux is running as a z/VM "
784 "guest operating system in 64-bit mode\n");
785 else if (MACHINE_IS_KVM
) {
786 pr_info("Linux is running under KVM in 64-bit mode\n");
787 add_preferred_console("hvc", 0, NULL
);
788 s390_virtio_console_init();
790 pr_info("Linux is running natively in 64-bit mode\n");
791 #endif /* CONFIG_64BIT */
793 /* Have one command line that is parsed and saved in /proc/cmdline */
794 /* boot_command_line has been already set up in early.c */
795 *cmdline_p
= boot_command_line
;
797 ROOT_DEV
= Root_RAM0
;
799 init_mm
.start_code
= PAGE_OFFSET
;
800 init_mm
.end_code
= (unsigned long) &_etext
;
801 init_mm
.end_data
= (unsigned long) &_edata
;
802 init_mm
.brk
= (unsigned long) &_end
;
804 if (MACHINE_HAS_MVCOS
)
805 memcpy(&uaccess
, &uaccess_mvcos
, sizeof(uaccess
));
807 memcpy(&uaccess
, &uaccess_std
, sizeof(uaccess
));
813 setup_addressing_mode();
819 __cpu_logical_map
[0] = S390_lowcore
.cpu_data
.cpu_addr
;
820 s390_init_cpu_topology();
823 * Setup capabilities (ELF_HWCAP & ELF_PLATFORM).
828 * Create kernel page tables and switch to virtual addressing.
832 /* Setup default console */
835 /* Setup zfcpdump support */
836 setup_zfcpdump(console_devno
);