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 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
];
89 volatile int __cpu_logical_map
[NR_CPUS
]; /* logical cpu to cpu address */
91 int __initdata memory_end_set
;
92 unsigned long __initdata memory_end
;
94 /* An array with a pointer to the lowcore of every CPU. */
95 struct _lowcore
*lowcore_ptr
[NR_CPUS
];
96 EXPORT_SYMBOL(lowcore_ptr
);
99 * This is set up by the setup-routine at boot-time
100 * for S390 need to find out, what we have to setup
101 * using address 0x10400 ...
104 #include <asm/setup.h>
106 static struct resource code_resource
= {
107 .name
= "Kernel code",
108 .flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
,
111 static struct resource data_resource
= {
112 .name
= "Kernel data",
113 .flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
,
117 * cpu_init() initializes state that is per-CPU.
119 void __cpuinit
cpu_init(void)
122 * Store processor id in lowcore (used e.g. in timer_interrupt)
124 get_cpu_id(&S390_lowcore
.cpu_id
);
127 * Force FPU initialization:
129 clear_thread_flag(TIF_USEDFPU
);
132 atomic_inc(&init_mm
.mm_count
);
133 current
->active_mm
= &init_mm
;
135 enter_lazy_tlb(&init_mm
, current
);
139 * condev= and conmode= setup parameter.
142 static int __init
condev_setup(char *str
)
146 vdev
= simple_strtoul(str
, &str
, 0);
147 if (vdev
>= 0 && vdev
< 65536) {
148 console_devno
= vdev
;
154 __setup("condev=", condev_setup
);
156 static int __init
conmode_setup(char *str
)
158 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
159 if (strncmp(str
, "hwc", 4) == 0 || strncmp(str
, "sclp", 5) == 0)
162 #if defined(CONFIG_TN3215_CONSOLE)
163 if (strncmp(str
, "3215", 5) == 0)
166 #if defined(CONFIG_TN3270_CONSOLE)
167 if (strncmp(str
, "3270", 5) == 0)
173 __setup("conmode=", conmode_setup
);
175 static void __init
conmode_default(void)
177 char query_buffer
[1024];
181 cpcmd("QUERY CONSOLE", query_buffer
, 1024, NULL
);
182 console_devno
= simple_strtoul(query_buffer
+ 5, NULL
, 16);
183 ptr
= strstr(query_buffer
, "SUBCHANNEL =");
184 console_irq
= simple_strtoul(ptr
+ 13, NULL
, 16);
185 cpcmd("QUERY TERM", query_buffer
, 1024, NULL
);
186 ptr
= strstr(query_buffer
, "CONMODE");
188 * Set the conmode to 3215 so that the device recognition
189 * will set the cu_type of the console to 3215. If the
190 * conmode is 3270 and we don't set it back then both
191 * 3215 and the 3270 driver will try to access the console
192 * device (3215 as console and 3270 as normal tty).
194 cpcmd("TERM CONMODE 3215", NULL
, 0, NULL
);
196 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
201 if (strncmp(ptr
+ 8, "3270", 4) == 0) {
202 #if defined(CONFIG_TN3270_CONSOLE)
204 #elif defined(CONFIG_TN3215_CONSOLE)
206 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
209 } else if (strncmp(ptr
+ 8, "3215", 4) == 0) {
210 #if defined(CONFIG_TN3215_CONSOLE)
212 #elif defined(CONFIG_TN3270_CONSOLE)
214 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
219 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
225 #ifdef CONFIG_ZFCPDUMP
226 static void __init
setup_zfcpdump(unsigned int console_devno
)
230 if (ipl_info
.type
!= IPL_TYPE_FCP_DUMP
)
232 if (console_devno
!= -1)
233 sprintf(str
, " cio_ignore=all,!0.0.%04x,!0.0.%04x",
234 ipl_info
.data
.fcp
.dev_id
.devno
, console_devno
);
236 sprintf(str
, " cio_ignore=all,!0.0.%04x",
237 ipl_info
.data
.fcp
.dev_id
.devno
);
238 strcat(boot_command_line
, str
);
239 console_loglevel
= 2;
242 static inline void setup_zfcpdump(unsigned int console_devno
) {}
243 #endif /* CONFIG_ZFCPDUMP */
246 * Reboot, halt and power_off stubs. They just call _machine_restart,
247 * _machine_halt or _machine_power_off.
250 void machine_restart(char *command
)
252 if ((!in_interrupt() && !in_atomic()) || 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_restart(command
);
261 void machine_halt(void)
263 if (!in_interrupt() || oops_in_progress
)
265 * Only unblank the console if we are called in enabled
266 * context or a bust_spinlocks cleared the way for us.
272 void machine_power_off(void)
274 if (!in_interrupt() || oops_in_progress
)
276 * Only unblank the console if we are called in enabled
277 * context or a bust_spinlocks cleared the way for us.
280 _machine_power_off();
284 * Dummy power off function.
286 void (*pm_power_off
)(void) = machine_power_off
;
288 static int __init
early_parse_mem(char *p
)
290 memory_end
= memparse(p
, &p
);
294 early_param("mem", early_parse_mem
);
296 #ifdef CONFIG_S390_SWITCH_AMODE
297 unsigned int switch_amode
= 0;
298 EXPORT_SYMBOL_GPL(switch_amode
);
300 static int set_amode_and_uaccess(unsigned long user_amode
,
301 unsigned long user32_amode
)
303 psw_user_bits
= PSW_BASE_BITS
| PSW_MASK_DAT
| user_amode
|
304 PSW_MASK_IO
| PSW_MASK_EXT
| PSW_MASK_MCHECK
|
305 PSW_MASK_PSTATE
| PSW_DEFAULT_KEY
;
307 psw_user32_bits
= PSW_BASE32_BITS
| PSW_MASK_DAT
| user_amode
|
308 PSW_MASK_IO
| PSW_MASK_EXT
| PSW_MASK_MCHECK
|
309 PSW_MASK_PSTATE
| PSW_DEFAULT_KEY
;
310 psw32_user_bits
= PSW32_BASE_BITS
| PSW32_MASK_DAT
| user32_amode
|
311 PSW32_MASK_IO
| PSW32_MASK_EXT
| PSW32_MASK_MCHECK
|
314 psw_kernel_bits
= PSW_BASE_BITS
| PSW_MASK_DAT
| PSW_ASC_HOME
|
315 PSW_MASK_MCHECK
| PSW_DEFAULT_KEY
;
317 if (MACHINE_HAS_MVCOS
) {
318 memcpy(&uaccess
, &uaccess_mvcos_switch
, sizeof(uaccess
));
321 memcpy(&uaccess
, &uaccess_pt
, sizeof(uaccess
));
327 * Switch kernel/user addressing modes?
329 static int __init
early_parse_switch_amode(char *p
)
334 early_param("switch_amode", early_parse_switch_amode
);
336 #else /* CONFIG_S390_SWITCH_AMODE */
337 static inline int set_amode_and_uaccess(unsigned long user_amode
,
338 unsigned long user32_amode
)
342 #endif /* CONFIG_S390_SWITCH_AMODE */
344 #ifdef CONFIG_S390_EXEC_PROTECT
345 unsigned int s390_noexec
= 0;
346 EXPORT_SYMBOL_GPL(s390_noexec
);
349 * Enable execute protection?
351 static int __init
early_parse_noexec(char *p
)
353 if (!strncmp(p
, "off", 3))
359 early_param("noexec", early_parse_noexec
);
360 #endif /* CONFIG_S390_EXEC_PROTECT */
362 static void setup_addressing_mode(void)
365 if (set_amode_and_uaccess(PSW_ASC_SECONDARY
,
366 PSW32_ASC_SECONDARY
))
367 pr_info("Execute protection active, "
368 "mvcos available\n");
370 pr_info("Execute protection active, "
371 "mvcos not available\n");
372 } else if (switch_amode
) {
373 if (set_amode_and_uaccess(PSW_ASC_PRIMARY
, PSW32_ASC_PRIMARY
))
374 pr_info("Address spaces switched, "
375 "mvcos available\n");
377 pr_info("Address spaces switched, "
378 "mvcos not available\n");
380 #ifdef CONFIG_TRACE_IRQFLAGS
381 sysc_restore_trace_psw
.mask
= psw_kernel_bits
& ~PSW_MASK_MCHECK
;
382 io_restore_trace_psw
.mask
= psw_kernel_bits
& ~PSW_MASK_MCHECK
;
393 * Setup lowcore for boot cpu
395 lc_pages
= sizeof(void *) == 8 ? 2 : 1;
396 lc
= (struct _lowcore
*)
397 __alloc_bootmem(lc_pages
* PAGE_SIZE
, lc_pages
* PAGE_SIZE
, 0);
398 memset(lc
, 0, lc_pages
* PAGE_SIZE
);
399 lc
->restart_psw
.mask
= PSW_BASE_BITS
| PSW_DEFAULT_KEY
;
400 lc
->restart_psw
.addr
=
401 PSW_ADDR_AMODE
| (unsigned long) restart_int_handler
;
403 lc
->restart_psw
.mask
|= PSW_ASC_HOME
;
404 lc
->external_new_psw
.mask
= psw_kernel_bits
;
405 lc
->external_new_psw
.addr
=
406 PSW_ADDR_AMODE
| (unsigned long) ext_int_handler
;
407 lc
->svc_new_psw
.mask
= psw_kernel_bits
| PSW_MASK_IO
| PSW_MASK_EXT
;
408 lc
->svc_new_psw
.addr
= PSW_ADDR_AMODE
| (unsigned long) system_call
;
409 lc
->program_new_psw
.mask
= psw_kernel_bits
;
410 lc
->program_new_psw
.addr
=
411 PSW_ADDR_AMODE
| (unsigned long)pgm_check_handler
;
412 lc
->mcck_new_psw
.mask
=
413 psw_kernel_bits
& ~PSW_MASK_MCHECK
& ~PSW_MASK_DAT
;
414 lc
->mcck_new_psw
.addr
=
415 PSW_ADDR_AMODE
| (unsigned long) mcck_int_handler
;
416 lc
->io_new_psw
.mask
= psw_kernel_bits
;
417 lc
->io_new_psw
.addr
= PSW_ADDR_AMODE
| (unsigned long) io_int_handler
;
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
;
426 lc
->machine_flags
= S390_lowcore
.machine_flags
;
428 if (MACHINE_HAS_IEEE
) {
429 lc
->extended_save_area_addr
= (__u32
)
430 __alloc_bootmem(PAGE_SIZE
, PAGE_SIZE
, 0);
431 /* enable extended save area */
432 __ctl_set_bit(14, 29);
435 lc
->vdso_per_cpu_data
= (unsigned long) &lc
->paste
[0];
437 lc
->sync_enter_timer
= S390_lowcore
.sync_enter_timer
;
438 lc
->async_enter_timer
= S390_lowcore
.async_enter_timer
;
439 lc
->exit_timer
= S390_lowcore
.exit_timer
;
440 lc
->user_timer
= S390_lowcore
.user_timer
;
441 lc
->system_timer
= S390_lowcore
.system_timer
;
442 lc
->steal_timer
= S390_lowcore
.steal_timer
;
443 lc
->last_update_timer
= S390_lowcore
.last_update_timer
;
444 lc
->last_update_clock
= S390_lowcore
.last_update_clock
;
445 set_prefix((u32
)(unsigned long) lc
);
450 setup_resources(void)
452 struct resource
*res
, *sub_res
;
455 code_resource
.start
= (unsigned long) &_text
;
456 code_resource
.end
= (unsigned long) &_etext
- 1;
457 data_resource
.start
= (unsigned long) &_etext
;
458 data_resource
.end
= (unsigned long) &_edata
- 1;
460 for (i
= 0; i
< MEMORY_CHUNKS
; i
++) {
461 if (!memory_chunk
[i
].size
)
463 res
= alloc_bootmem_low(sizeof(struct resource
));
464 res
->flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
;
465 switch (memory_chunk
[i
].type
) {
466 case CHUNK_READ_WRITE
:
467 res
->name
= "System RAM";
469 case CHUNK_READ_ONLY
:
470 res
->name
= "System ROM";
471 res
->flags
|= IORESOURCE_READONLY
;
474 res
->name
= "reserved";
476 res
->start
= memory_chunk
[i
].addr
;
477 res
->end
= memory_chunk
[i
].addr
+ memory_chunk
[i
].size
- 1;
478 request_resource(&iomem_resource
, res
);
480 if (code_resource
.start
>= res
->start
&&
481 code_resource
.start
<= res
->end
&&
482 code_resource
.end
> res
->end
) {
483 sub_res
= alloc_bootmem_low(sizeof(struct resource
));
484 memcpy(sub_res
, &code_resource
,
485 sizeof(struct resource
));
486 sub_res
->end
= res
->end
;
487 code_resource
.start
= res
->end
+ 1;
488 request_resource(res
, sub_res
);
491 if (code_resource
.start
>= res
->start
&&
492 code_resource
.start
<= res
->end
&&
493 code_resource
.end
<= res
->end
)
494 request_resource(res
, &code_resource
);
496 if (data_resource
.start
>= res
->start
&&
497 data_resource
.start
<= res
->end
&&
498 data_resource
.end
> res
->end
) {
499 sub_res
= alloc_bootmem_low(sizeof(struct resource
));
500 memcpy(sub_res
, &data_resource
,
501 sizeof(struct resource
));
502 sub_res
->end
= res
->end
;
503 data_resource
.start
= res
->end
+ 1;
504 request_resource(res
, sub_res
);
507 if (data_resource
.start
>= res
->start
&&
508 data_resource
.start
<= res
->end
&&
509 data_resource
.end
<= res
->end
)
510 request_resource(res
, &data_resource
);
514 unsigned long real_memory_size
;
515 EXPORT_SYMBOL_GPL(real_memory_size
);
517 static void __init
setup_memory_end(void)
519 unsigned long memory_size
;
520 unsigned long max_mem
;
523 #ifdef CONFIG_ZFCPDUMP
524 if (ipl_info
.type
== IPL_TYPE_FCP_DUMP
) {
525 memory_end
= ZFCPDUMP_HSA_SIZE
;
530 memory_end
&= PAGE_MASK
;
532 max_mem
= memory_end
? min(VMEM_MAX_PHYS
, memory_end
) : VMEM_MAX_PHYS
;
533 memory_end
= min(max_mem
, memory_end
);
536 * Make sure all chunks are MAX_ORDER aligned so we don't need the
537 * extra checks that HOLES_IN_ZONE would require.
539 for (i
= 0; i
< MEMORY_CHUNKS
; i
++) {
540 unsigned long start
, end
;
541 struct mem_chunk
*chunk
;
544 chunk
= &memory_chunk
[i
];
545 align
= 1UL << (MAX_ORDER
+ PAGE_SHIFT
- 1);
546 start
= (chunk
->addr
+ align
- 1) & ~(align
- 1);
547 end
= (chunk
->addr
+ chunk
->size
) & ~(align
- 1);
549 memset(chunk
, 0, sizeof(*chunk
));
552 chunk
->size
= end
- start
;
556 for (i
= 0; i
< MEMORY_CHUNKS
; i
++) {
557 struct mem_chunk
*chunk
= &memory_chunk
[i
];
559 real_memory_size
= max(real_memory_size
,
560 chunk
->addr
+ chunk
->size
);
561 if (chunk
->addr
>= max_mem
) {
562 memset(chunk
, 0, sizeof(*chunk
));
565 if (chunk
->addr
+ chunk
->size
> max_mem
)
566 chunk
->size
= max_mem
- chunk
->addr
;
567 memory_size
= max(memory_size
, chunk
->addr
+ chunk
->size
);
570 memory_end
= memory_size
;
576 unsigned long bootmap_size
;
577 unsigned long start_pfn
, end_pfn
;
581 * partially used pages are not usable - thus
582 * we are rounding upwards:
584 start_pfn
= PFN_UP(__pa(&_end
));
585 end_pfn
= max_pfn
= PFN_DOWN(memory_end
);
587 #ifdef CONFIG_BLK_DEV_INITRD
589 * Move the initrd in case the bitmap of the bootmem allocater
590 * would overwrite it.
593 if (INITRD_START
&& INITRD_SIZE
) {
594 unsigned long bmap_size
;
597 bmap_size
= bootmem_bootmap_pages(end_pfn
- start_pfn
+ 1);
598 bmap_size
= PFN_PHYS(bmap_size
);
600 if (PFN_PHYS(start_pfn
) + bmap_size
> INITRD_START
) {
601 start
= PFN_PHYS(start_pfn
) + bmap_size
+ PAGE_SIZE
;
603 if (start
+ INITRD_SIZE
> memory_end
) {
604 pr_err("initrd extends beyond end of "
605 "memory (0x%08lx > 0x%08lx) "
606 "disabling initrd\n",
607 start
+ INITRD_SIZE
, memory_end
);
608 INITRD_START
= INITRD_SIZE
= 0;
610 pr_info("Moving initrd (0x%08lx -> "
611 "0x%08lx, size: %ld)\n",
612 INITRD_START
, start
, INITRD_SIZE
);
613 memmove((void *) start
, (void *) INITRD_START
,
615 INITRD_START
= start
;
622 * Initialize the boot-time allocator
624 bootmap_size
= init_bootmem(start_pfn
, end_pfn
);
627 * Register RAM areas with the bootmem allocator.
630 for (i
= 0; i
< MEMORY_CHUNKS
&& memory_chunk
[i
].size
> 0; i
++) {
631 unsigned long start_chunk
, end_chunk
, pfn
;
633 if (memory_chunk
[i
].type
!= CHUNK_READ_WRITE
)
635 start_chunk
= PFN_DOWN(memory_chunk
[i
].addr
);
636 end_chunk
= start_chunk
+ PFN_DOWN(memory_chunk
[i
].size
);
637 end_chunk
= min(end_chunk
, end_pfn
);
638 if (start_chunk
>= end_chunk
)
640 add_active_range(0, start_chunk
, end_chunk
);
641 pfn
= max(start_chunk
, start_pfn
);
642 for (; pfn
< end_chunk
; pfn
++)
643 page_set_storage_key(PFN_PHYS(pfn
), PAGE_DEFAULT_KEY
);
646 psw_set_key(PAGE_DEFAULT_KEY
);
648 free_bootmem_with_active_regions(0, max_pfn
);
651 * Reserve memory used for lowcore/command line/kernel image.
653 reserve_bootmem(0, (unsigned long)_ehead
, BOOTMEM_DEFAULT
);
654 reserve_bootmem((unsigned long)_stext
,
655 PFN_PHYS(start_pfn
) - (unsigned long)_stext
,
658 * Reserve the bootmem bitmap itself as well. We do this in two
659 * steps (first step was init_bootmem()) because this catches
660 * the (very unlikely) case of us accidentally initializing the
661 * bootmem allocator with an invalid RAM area.
663 reserve_bootmem(start_pfn
<< PAGE_SHIFT
, bootmap_size
,
666 #ifdef CONFIG_BLK_DEV_INITRD
667 if (INITRD_START
&& INITRD_SIZE
) {
668 if (INITRD_START
+ INITRD_SIZE
<= memory_end
) {
669 reserve_bootmem(INITRD_START
, INITRD_SIZE
,
671 initrd_start
= INITRD_START
;
672 initrd_end
= initrd_start
+ INITRD_SIZE
;
674 pr_err("initrd extends beyond end of "
675 "memory (0x%08lx > 0x%08lx) "
676 "disabling initrd\n",
677 initrd_start
+ INITRD_SIZE
, memory_end
);
678 initrd_start
= initrd_end
= 0;
685 * Setup hardware capabilities.
687 static void __init
setup_hwcaps(void)
689 static const int stfl_bits
[6] = { 0, 2, 7, 17, 19, 21 };
690 unsigned long long facility_list_extended
;
691 unsigned int facility_list
;
694 facility_list
= stfl();
696 * The store facility list bits numbers as found in the principles
697 * of operation are numbered with bit 1UL<<31 as number 0 to
698 * bit 1UL<<0 as number 31.
699 * Bit 0: instructions named N3, "backported" to esa-mode
700 * Bit 2: z/Architecture mode is active
701 * Bit 7: the store-facility-list-extended facility is installed
702 * Bit 17: the message-security assist is installed
703 * Bit 19: the long-displacement facility is installed
704 * Bit 21: the extended-immediate facility is installed
705 * Bit 22: extended-translation facility 3 is installed
706 * Bit 30: extended-translation facility 3 enhancement facility
707 * These get translated to:
708 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
709 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
710 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
711 * HWCAP_S390_ETF3EH bit 8 (22 && 30).
713 for (i
= 0; i
< 6; i
++)
714 if (facility_list
& (1UL << (31 - stfl_bits
[i
])))
715 elf_hwcap
|= 1UL << i
;
717 if ((facility_list
& (1UL << (31 - 22)))
718 && (facility_list
& (1UL << (31 - 30))))
719 elf_hwcap
|= 1UL << 8;
722 * Check for additional facilities with store-facility-list-extended.
723 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
724 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
725 * as stored by stfl, bits 32-xxx contain additional facilities.
726 * How many facility words are stored depends on the number of
727 * doublewords passed to the instruction. The additional facilites
729 * Bit 42: decimal floating point facility is installed
730 * Bit 44: perform floating point operation facility is installed
732 * HWCAP_S390_DFP bit 6 (42 && 44).
734 if ((elf_hwcap
& (1UL << 2)) &&
735 __stfle(&facility_list_extended
, 1) > 0) {
736 if ((facility_list_extended
& (1ULL << (63 - 42)))
737 && (facility_list_extended
& (1ULL << (63 - 44))))
738 elf_hwcap
|= 1UL << 6;
741 if (MACHINE_HAS_HPAGE
)
742 elf_hwcap
|= 1UL << 7;
744 switch (S390_lowcore
.cpu_id
.machine
) {
746 #if !defined(CONFIG_64BIT)
747 default: /* Use "g5" as default for 31 bit kernels. */
749 strcpy(elf_platform
, "g5");
753 #if defined(CONFIG_64BIT)
754 default: /* Use "z900" as default for 64 bit kernels. */
756 strcpy(elf_platform
, "z900");
760 strcpy(elf_platform
, "z990");
764 strcpy(elf_platform
, "z9-109");
768 strcpy(elf_platform
, "z10");
774 * Setup function called from init/main.c just after the banner
779 setup_arch(char **cmdline_p
)
781 /* set up preferred console */
782 add_preferred_console("ttyS", 0, NULL
);
785 * print what head.S has found out about the machine
789 pr_info("Linux is running as a z/VM "
790 "guest operating system in 31-bit mode\n");
792 pr_info("Linux is running natively in 31-bit mode\n");
793 if (MACHINE_HAS_IEEE
)
794 pr_info("The hardware system has IEEE compatible "
795 "floating point units\n");
797 pr_info("The hardware system has no IEEE compatible "
798 "floating point units\n");
799 #else /* CONFIG_64BIT */
801 pr_info("Linux is running as a z/VM "
802 "guest operating system in 64-bit mode\n");
803 else if (MACHINE_IS_KVM
) {
804 pr_info("Linux is running under KVM in 64-bit mode\n");
805 add_preferred_console("hvc", 0, NULL
);
806 s390_virtio_console_init();
808 pr_info("Linux is running natively in 64-bit mode\n");
809 #endif /* CONFIG_64BIT */
811 /* Have one command line that is parsed and saved in /proc/cmdline */
812 /* boot_command_line has been already set up in early.c */
813 *cmdline_p
= boot_command_line
;
815 ROOT_DEV
= Root_RAM0
;
817 init_mm
.start_code
= PAGE_OFFSET
;
818 init_mm
.end_code
= (unsigned long) &_etext
;
819 init_mm
.end_data
= (unsigned long) &_edata
;
820 init_mm
.brk
= (unsigned long) &_end
;
822 if (MACHINE_HAS_MVCOS
)
823 memcpy(&uaccess
, &uaccess_mvcos
, sizeof(uaccess
));
825 memcpy(&uaccess
, &uaccess_std
, sizeof(uaccess
));
831 setup_addressing_mode();
837 __cpu_logical_map
[0] = stap();
838 s390_init_cpu_topology();
841 * Setup capabilities (ELF_HWCAP & ELF_PLATFORM).
846 * Create kernel page tables and switch to virtual addressing.
850 /* Setup default console */
853 /* Setup zfcpdump support */
854 setup_zfcpdump(console_devno
);