3 * Copyright IBM Corp. 1999, 2012
4 * Author(s): Hartmut Penner (hp@de.ibm.com),
5 * Martin Schwidefsky (schwidefsky@de.ibm.com)
7 * Derived from "arch/i386/kernel/setup.c"
8 * Copyright (C) 1995, Linus Torvalds
12 * This file handles the architecture-dependent parts of initialization
15 #define KMSG_COMPONENT "setup"
16 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
18 #include <linux/errno.h>
19 #include <linux/export.h>
20 #include <linux/sched.h>
21 #include <linux/sched/task.h>
22 #include <linux/cpu.h>
23 #include <linux/kernel.h>
24 #include <linux/memblock.h>
26 #include <linux/stddef.h>
27 #include <linux/unistd.h>
28 #include <linux/ptrace.h>
29 #include <linux/random.h>
30 #include <linux/user.h>
31 #include <linux/tty.h>
32 #include <linux/ioport.h>
33 #include <linux/delay.h>
34 #include <linux/init.h>
35 #include <linux/initrd.h>
36 #include <linux/bootmem.h>
37 #include <linux/root_dev.h>
38 #include <linux/console.h>
39 #include <linux/kernel_stat.h>
40 #include <linux/dma-contiguous.h>
41 #include <linux/device.h>
42 #include <linux/notifier.h>
43 #include <linux/pfn.h>
44 #include <linux/ctype.h>
45 #include <linux/reboot.h>
46 #include <linux/topology.h>
47 #include <linux/kexec.h>
48 #include <linux/crash_dump.h>
49 #include <linux/memory.h>
50 #include <linux/compat.h>
53 #include <asm/facility.h>
55 #include <asm/mmu_context.h>
56 #include <asm/cpcmd.h>
57 #include <asm/lowcore.h>
61 #include <asm/ptrace.h>
62 #include <asm/sections.h>
63 #include <asm/ebcdic.h>
65 #include <asm/os_info.h>
67 #include <asm/sysinfo.h>
69 #include <asm/alternative.h>
75 unsigned int console_mode
= 0;
76 EXPORT_SYMBOL(console_mode
);
78 unsigned int console_devno
= -1;
79 EXPORT_SYMBOL(console_devno
);
81 unsigned int console_irq
= -1;
82 EXPORT_SYMBOL(console_irq
);
84 unsigned long elf_hwcap __read_mostly
= 0;
85 char elf_platform
[ELF_PLATFORM_SIZE
];
87 unsigned long int_hwcap
= 0;
89 int __initdata memory_end_set
;
90 unsigned long __initdata memory_end
;
91 unsigned long __initdata max_physmem_end
;
93 unsigned long VMALLOC_START
;
94 EXPORT_SYMBOL(VMALLOC_START
);
96 unsigned long VMALLOC_END
;
97 EXPORT_SYMBOL(VMALLOC_END
);
100 EXPORT_SYMBOL(vmemmap
);
102 unsigned long MODULES_VADDR
;
103 unsigned long MODULES_END
;
105 /* An array with a pointer to the lowcore of every CPU. */
106 struct lowcore
*lowcore_ptr
[NR_CPUS
];
107 EXPORT_SYMBOL(lowcore_ptr
);
110 * This is set up by the setup-routine at boot-time
111 * for S390 need to find out, what we have to setup
112 * using address 0x10400 ...
115 #include <asm/setup.h>
118 * condev= and conmode= setup parameter.
121 static int __init
condev_setup(char *str
)
125 vdev
= simple_strtoul(str
, &str
, 0);
126 if (vdev
>= 0 && vdev
< 65536) {
127 console_devno
= vdev
;
133 __setup("condev=", condev_setup
);
135 static void __init
set_preferred_console(void)
137 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 else if (CONSOLE_IS_VT220
)
142 add_preferred_console("ttyS", 1, NULL
);
143 else if (CONSOLE_IS_HVC
)
144 add_preferred_console("hvc", 0, NULL
);
147 static int __init
conmode_setup(char *str
)
149 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
150 if (strncmp(str
, "hwc", 4) == 0 || strncmp(str
, "sclp", 5) == 0)
153 #if defined(CONFIG_TN3215_CONSOLE)
154 if (strncmp(str
, "3215", 5) == 0)
157 #if defined(CONFIG_TN3270_CONSOLE)
158 if (strncmp(str
, "3270", 5) == 0)
161 set_preferred_console();
165 __setup("conmode=", conmode_setup
);
167 static void __init
conmode_default(void)
169 char query_buffer
[1024];
173 cpcmd("QUERY CONSOLE", query_buffer
, 1024, NULL
);
174 console_devno
= simple_strtoul(query_buffer
+ 5, NULL
, 16);
175 ptr
= strstr(query_buffer
, "SUBCHANNEL =");
176 console_irq
= simple_strtoul(ptr
+ 13, NULL
, 16);
177 cpcmd("QUERY TERM", query_buffer
, 1024, NULL
);
178 ptr
= strstr(query_buffer
, "CONMODE");
180 * Set the conmode to 3215 so that the device recognition
181 * will set the cu_type of the console to 3215. If the
182 * conmode is 3270 and we don't set it back then both
183 * 3215 and the 3270 driver will try to access the console
184 * device (3215 as console and 3270 as normal tty).
186 cpcmd("TERM CONMODE 3215", NULL
, 0, NULL
);
188 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
193 if (strncmp(ptr
+ 8, "3270", 4) == 0) {
194 #if defined(CONFIG_TN3270_CONSOLE)
196 #elif defined(CONFIG_TN3215_CONSOLE)
198 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
201 } else if (strncmp(ptr
+ 8, "3215", 4) == 0) {
202 #if defined(CONFIG_TN3215_CONSOLE)
204 #elif defined(CONFIG_TN3270_CONSOLE)
206 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
210 } else if (MACHINE_IS_KVM
) {
211 if (sclp
.has_vt220
&& IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE
))
213 else if (sclp
.has_linemode
&& IS_ENABLED(CONFIG_SCLP_CONSOLE
))
218 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
224 #ifdef CONFIG_CRASH_DUMP
225 static void __init
setup_zfcpdump(void)
227 if (ipl_info
.type
!= IPL_TYPE_FCP_DUMP
)
231 strcat(boot_command_line
, " cio_ignore=all,!ipldev,!condev");
232 console_loglevel
= 2;
235 static inline void setup_zfcpdump(void) {}
236 #endif /* CONFIG_CRASH_DUMP */
239 * Reboot, halt and power_off stubs. They just call _machine_restart,
240 * _machine_halt or _machine_power_off.
243 void machine_restart(char *command
)
245 if ((!in_interrupt() && !in_atomic()) || oops_in_progress
)
247 * Only unblank the console if we are called in enabled
248 * context or a bust_spinlocks cleared the way for us.
251 _machine_restart(command
);
254 void machine_halt(void)
256 if (!in_interrupt() || oops_in_progress
)
258 * Only unblank the console if we are called in enabled
259 * context or a bust_spinlocks cleared the way for us.
265 void machine_power_off(void)
267 if (!in_interrupt() || oops_in_progress
)
269 * Only unblank the console if we are called in enabled
270 * context or a bust_spinlocks cleared the way for us.
273 _machine_power_off();
277 * Dummy power off function.
279 void (*pm_power_off
)(void) = machine_power_off
;
280 EXPORT_SYMBOL_GPL(pm_power_off
);
282 static int __init
early_parse_mem(char *p
)
284 memory_end
= memparse(p
, &p
);
285 memory_end
&= PAGE_MASK
;
289 early_param("mem", early_parse_mem
);
291 static int __init
parse_vmalloc(char *arg
)
295 VMALLOC_END
= (memparse(arg
, &arg
) + PAGE_SIZE
- 1) & PAGE_MASK
;
298 early_param("vmalloc", parse_vmalloc
);
300 void *restart_stack
__section(.data
);
302 static void __init
setup_lowcore(void)
307 * Setup lowcore for boot cpu
309 BUILD_BUG_ON(sizeof(struct lowcore
) != LC_PAGES
* PAGE_SIZE
);
310 lc
= memblock_virt_alloc_low(sizeof(*lc
), sizeof(*lc
));
311 lc
->restart_psw
.mask
= PSW_KERNEL_BITS
;
312 lc
->restart_psw
.addr
= (unsigned long) restart_int_handler
;
313 lc
->external_new_psw
.mask
= PSW_KERNEL_BITS
|
314 PSW_MASK_DAT
| PSW_MASK_MCHECK
;
315 lc
->external_new_psw
.addr
= (unsigned long) ext_int_handler
;
316 lc
->svc_new_psw
.mask
= PSW_KERNEL_BITS
|
317 PSW_MASK_DAT
| PSW_MASK_IO
| PSW_MASK_EXT
| PSW_MASK_MCHECK
;
318 lc
->svc_new_psw
.addr
= (unsigned long) system_call
;
319 lc
->program_new_psw
.mask
= PSW_KERNEL_BITS
|
320 PSW_MASK_DAT
| PSW_MASK_MCHECK
;
321 lc
->program_new_psw
.addr
= (unsigned long) pgm_check_handler
;
322 lc
->mcck_new_psw
.mask
= PSW_KERNEL_BITS
;
323 lc
->mcck_new_psw
.addr
= (unsigned long) mcck_int_handler
;
324 lc
->io_new_psw
.mask
= PSW_KERNEL_BITS
|
325 PSW_MASK_DAT
| PSW_MASK_MCHECK
;
326 lc
->io_new_psw
.addr
= (unsigned long) io_int_handler
;
327 lc
->clock_comparator
= clock_comparator_max
;
328 lc
->kernel_stack
= ((unsigned long) &init_thread_union
)
329 + THREAD_SIZE
- STACK_FRAME_OVERHEAD
- sizeof(struct pt_regs
);
330 lc
->async_stack
= (unsigned long)
331 memblock_virt_alloc(ASYNC_SIZE
, ASYNC_SIZE
)
332 + ASYNC_SIZE
- STACK_FRAME_OVERHEAD
- sizeof(struct pt_regs
);
333 lc
->panic_stack
= (unsigned long)
334 memblock_virt_alloc(PAGE_SIZE
, PAGE_SIZE
)
335 + PAGE_SIZE
- STACK_FRAME_OVERHEAD
- sizeof(struct pt_regs
);
336 lc
->current_task
= (unsigned long)&init_task
;
338 lc
->machine_flags
= S390_lowcore
.machine_flags
;
339 lc
->preempt_count
= S390_lowcore
.preempt_count
;
340 lc
->stfl_fac_list
= S390_lowcore
.stfl_fac_list
;
341 memcpy(lc
->stfle_fac_list
, S390_lowcore
.stfle_fac_list
,
343 nmi_alloc_boot_cpu(lc
);
344 vdso_alloc_boot_cpu(lc
);
345 lc
->sync_enter_timer
= S390_lowcore
.sync_enter_timer
;
346 lc
->async_enter_timer
= S390_lowcore
.async_enter_timer
;
347 lc
->exit_timer
= S390_lowcore
.exit_timer
;
348 lc
->user_timer
= S390_lowcore
.user_timer
;
349 lc
->system_timer
= S390_lowcore
.system_timer
;
350 lc
->steal_timer
= S390_lowcore
.steal_timer
;
351 lc
->last_update_timer
= S390_lowcore
.last_update_timer
;
352 lc
->last_update_clock
= S390_lowcore
.last_update_clock
;
354 restart_stack
= memblock_virt_alloc(ASYNC_SIZE
, ASYNC_SIZE
);
355 restart_stack
+= ASYNC_SIZE
;
358 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant
359 * restart data to the absolute zero lowcore. This is necessary if
360 * PSW restart is done on an offline CPU that has lowcore zero.
362 lc
->restart_stack
= (unsigned long) restart_stack
;
363 lc
->restart_fn
= (unsigned long) do_restart
;
364 lc
->restart_data
= 0;
365 lc
->restart_source
= -1UL;
367 /* Setup absolute zero lowcore */
368 mem_assign_absolute(S390_lowcore
.restart_stack
, lc
->restart_stack
);
369 mem_assign_absolute(S390_lowcore
.restart_fn
, lc
->restart_fn
);
370 mem_assign_absolute(S390_lowcore
.restart_data
, lc
->restart_data
);
371 mem_assign_absolute(S390_lowcore
.restart_source
, lc
->restart_source
);
372 mem_assign_absolute(S390_lowcore
.restart_psw
, lc
->restart_psw
);
375 lc
->spinlock_lockval
= arch_spin_lockval(0);
376 lc
->spinlock_index
= 0;
377 arch_spin_lock_setup(0);
380 set_prefix((u32
)(unsigned long) lc
);
384 static struct resource code_resource
= {
385 .name
= "Kernel code",
386 .flags
= IORESOURCE_BUSY
| IORESOURCE_SYSTEM_RAM
,
389 static struct resource data_resource
= {
390 .name
= "Kernel data",
391 .flags
= IORESOURCE_BUSY
| IORESOURCE_SYSTEM_RAM
,
394 static struct resource bss_resource
= {
395 .name
= "Kernel bss",
396 .flags
= IORESOURCE_BUSY
| IORESOURCE_SYSTEM_RAM
,
399 static struct resource __initdata
*standard_resources
[] = {
405 static void __init
setup_resources(void)
407 struct resource
*res
, *std_res
, *sub_res
;
408 struct memblock_region
*reg
;
411 code_resource
.start
= (unsigned long) &_text
;
412 code_resource
.end
= (unsigned long) &_etext
- 1;
413 data_resource
.start
= (unsigned long) &_etext
;
414 data_resource
.end
= (unsigned long) &_edata
- 1;
415 bss_resource
.start
= (unsigned long) &__bss_start
;
416 bss_resource
.end
= (unsigned long) &__bss_stop
- 1;
418 for_each_memblock(memory
, reg
) {
419 res
= memblock_virt_alloc(sizeof(*res
), 8);
420 res
->flags
= IORESOURCE_BUSY
| IORESOURCE_SYSTEM_RAM
;
422 res
->name
= "System RAM";
423 res
->start
= reg
->base
;
424 res
->end
= reg
->base
+ reg
->size
- 1;
425 request_resource(&iomem_resource
, res
);
427 for (j
= 0; j
< ARRAY_SIZE(standard_resources
); j
++) {
428 std_res
= standard_resources
[j
];
429 if (std_res
->start
< res
->start
||
430 std_res
->start
> res
->end
)
432 if (std_res
->end
> res
->end
) {
433 sub_res
= memblock_virt_alloc(sizeof(*sub_res
), 8);
435 sub_res
->end
= res
->end
;
436 std_res
->start
= res
->end
+ 1;
437 request_resource(res
, sub_res
);
439 request_resource(res
, std_res
);
443 #ifdef CONFIG_CRASH_DUMP
445 * Re-add removed crash kernel memory as reserved memory. This makes
446 * sure it will be mapped with the identity mapping and struct pages
447 * will be created, so it can be resized later on.
448 * However add it later since the crash kernel resource should not be
449 * part of the System RAM resource.
451 if (crashk_res
.end
) {
452 memblock_add_node(crashk_res
.start
, resource_size(&crashk_res
), 0);
453 memblock_reserve(crashk_res
.start
, resource_size(&crashk_res
));
454 insert_resource(&iomem_resource
, &crashk_res
);
459 static void __init
setup_memory_end(void)
461 unsigned long vmax
, vmalloc_size
, tmp
;
463 /* Choose kernel address space layout: 2, 3, or 4 levels. */
464 vmalloc_size
= VMALLOC_END
?: (128UL << 30) - MODULES_LEN
;
465 tmp
= (memory_end
?: max_physmem_end
) / PAGE_SIZE
;
466 tmp
= tmp
* (sizeof(struct page
) + PAGE_SIZE
);
467 if (tmp
+ vmalloc_size
+ MODULES_LEN
<= _REGION2_SIZE
)
468 vmax
= _REGION2_SIZE
; /* 3-level kernel page table */
470 vmax
= _REGION1_SIZE
; /* 4-level kernel page table */
471 /* module area is at the end of the kernel address space. */
473 MODULES_VADDR
= MODULES_END
- MODULES_LEN
;
474 VMALLOC_END
= MODULES_VADDR
;
475 VMALLOC_START
= vmax
- vmalloc_size
;
477 /* Split remaining virtual space between 1:1 mapping & vmemmap array */
478 tmp
= VMALLOC_START
/ (PAGE_SIZE
+ sizeof(struct page
));
479 /* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */
480 tmp
= SECTION_ALIGN_UP(tmp
);
481 tmp
= VMALLOC_START
- tmp
* sizeof(struct page
);
482 tmp
&= ~((vmax
>> 11) - 1); /* align to page table level */
483 tmp
= min(tmp
, 1UL << MAX_PHYSMEM_BITS
);
484 vmemmap
= (struct page
*) tmp
;
486 /* Take care that memory_end is set and <= vmemmap */
487 memory_end
= min(memory_end
?: max_physmem_end
, tmp
);
488 max_pfn
= max_low_pfn
= PFN_DOWN(memory_end
);
489 memblock_remove(memory_end
, ULONG_MAX
);
491 pr_notice("The maximum memory size is %luMB\n", memory_end
>> 20);
494 #ifdef CONFIG_CRASH_DUMP
497 * When kdump is enabled, we have to ensure that no memory from
498 * the area [0 - crashkernel memory size] and
499 * [crashk_res.start - crashk_res.end] is set offline.
501 static int kdump_mem_notifier(struct notifier_block
*nb
,
502 unsigned long action
, void *data
)
504 struct memory_notify
*arg
= data
;
506 if (action
!= MEM_GOING_OFFLINE
)
508 if (arg
->start_pfn
< PFN_DOWN(resource_size(&crashk_res
)))
510 if (arg
->start_pfn
> PFN_DOWN(crashk_res
.end
))
512 if (arg
->start_pfn
+ arg
->nr_pages
- 1 < PFN_DOWN(crashk_res
.start
))
517 static struct notifier_block kdump_mem_nb
= {
518 .notifier_call
= kdump_mem_notifier
,
524 * Make sure that the area behind memory_end is protected
526 static void reserve_memory_end(void)
528 #ifdef CONFIG_CRASH_DUMP
529 if (ipl_info
.type
== IPL_TYPE_FCP_DUMP
&&
530 !OLDMEM_BASE
&& sclp
.hsa_size
) {
531 memory_end
= sclp
.hsa_size
;
532 memory_end
&= PAGE_MASK
;
538 memblock_reserve(memory_end
, ULONG_MAX
);
542 * Make sure that oldmem, where the dump is stored, is protected
544 static void reserve_oldmem(void)
546 #ifdef CONFIG_CRASH_DUMP
548 /* Forget all memory above the running kdump system */
549 memblock_reserve(OLDMEM_SIZE
, (phys_addr_t
)ULONG_MAX
);
554 * Make sure that oldmem, where the dump is stored, is protected
556 static void remove_oldmem(void)
558 #ifdef CONFIG_CRASH_DUMP
560 /* Forget all memory above the running kdump system */
561 memblock_remove(OLDMEM_SIZE
, (phys_addr_t
)ULONG_MAX
);
566 * Reserve memory for kdump kernel to be loaded with kexec
568 static void __init
reserve_crashkernel(void)
570 #ifdef CONFIG_CRASH_DUMP
571 unsigned long long crash_base
, crash_size
;
572 phys_addr_t low
, high
;
575 rc
= parse_crashkernel(boot_command_line
, memory_end
, &crash_size
,
578 crash_base
= ALIGN(crash_base
, KEXEC_CRASH_MEM_ALIGN
);
579 crash_size
= ALIGN(crash_size
, KEXEC_CRASH_MEM_ALIGN
);
580 if (rc
|| crash_size
== 0)
583 if (memblock
.memory
.regions
[0].size
< crash_size
) {
584 pr_info("crashkernel reservation failed: %s\n",
585 "first memory chunk must be at least crashkernel size");
589 low
= crash_base
?: OLDMEM_BASE
;
590 high
= low
+ crash_size
;
591 if (low
>= OLDMEM_BASE
&& high
<= OLDMEM_BASE
+ OLDMEM_SIZE
) {
592 /* The crashkernel fits into OLDMEM, reuse OLDMEM */
595 /* Find suitable area in free memory */
596 low
= max_t(unsigned long, crash_size
, sclp
.hsa_size
);
597 high
= crash_base
? crash_base
+ crash_size
: ULONG_MAX
;
599 if (crash_base
&& crash_base
< low
) {
600 pr_info("crashkernel reservation failed: %s\n",
601 "crash_base too low");
604 low
= crash_base
?: low
;
605 crash_base
= memblock_find_in_range(low
, high
, crash_size
,
606 KEXEC_CRASH_MEM_ALIGN
);
610 pr_info("crashkernel reservation failed: %s\n",
611 "no suitable area found");
615 if (register_memory_notifier(&kdump_mem_nb
))
618 if (!OLDMEM_BASE
&& MACHINE_IS_VM
)
619 diag10_range(PFN_DOWN(crash_base
), PFN_DOWN(crash_size
));
620 crashk_res
.start
= crash_base
;
621 crashk_res
.end
= crash_base
+ crash_size
- 1;
622 memblock_remove(crash_base
, crash_size
);
623 pr_info("Reserving %lluMB of memory at %lluMB "
624 "for crashkernel (System RAM: %luMB)\n",
625 crash_size
>> 20, crash_base
>> 20,
626 (unsigned long)memblock
.memory
.total_size
>> 20);
627 os_info_crashkernel_add(crash_base
, crash_size
);
632 * Reserve the initrd from being used by memblock
634 static void __init
reserve_initrd(void)
636 #ifdef CONFIG_BLK_DEV_INITRD
637 if (!INITRD_START
|| !INITRD_SIZE
)
639 initrd_start
= INITRD_START
;
640 initrd_end
= initrd_start
+ INITRD_SIZE
;
641 memblock_reserve(INITRD_START
, INITRD_SIZE
);
646 * Check for initrd being in usable memory
648 static void __init
check_initrd(void)
650 #ifdef CONFIG_BLK_DEV_INITRD
651 if (INITRD_START
&& INITRD_SIZE
&&
652 !memblock_is_region_memory(INITRD_START
, INITRD_SIZE
)) {
653 pr_err("The initial RAM disk does not fit into the memory\n");
654 memblock_free(INITRD_START
, INITRD_SIZE
);
655 initrd_start
= initrd_end
= 0;
661 * Reserve memory used for lowcore/command line/kernel image.
663 static void __init
reserve_kernel(void)
665 unsigned long start_pfn
= PFN_UP(__pa(&_end
));
667 #ifdef CONFIG_DMA_API_DEBUG
669 * DMA_API_DEBUG code stumbles over addresses from the
670 * range [_ehead, _stext]. Mark the memory as reserved
671 * so it is not used for CONFIG_DMA_API_DEBUG=y.
673 memblock_reserve(0, PFN_PHYS(start_pfn
));
675 memblock_reserve(0, (unsigned long)_ehead
);
676 memblock_reserve((unsigned long)_stext
, PFN_PHYS(start_pfn
)
677 - (unsigned long)_stext
);
681 static void __init
setup_memory(void)
683 struct memblock_region
*reg
;
686 * Init storage key for present memory
688 for_each_memblock(memory
, reg
) {
689 storage_key_init_range(reg
->base
, reg
->base
+ reg
->size
);
691 psw_set_key(PAGE_DEFAULT_KEY
);
694 memblock_enforce_memory_limit(memblock_end_of_DRAM());
698 * Setup hardware capabilities.
700 static int __init
setup_hwcaps(void)
702 static const int stfl_bits
[6] = { 0, 2, 7, 17, 19, 21 };
707 * The store facility list bits numbers as found in the principles
708 * of operation are numbered with bit 1UL<<31 as number 0 to
709 * bit 1UL<<0 as number 31.
710 * Bit 0: instructions named N3, "backported" to esa-mode
711 * Bit 2: z/Architecture mode is active
712 * Bit 7: the store-facility-list-extended facility is installed
713 * Bit 17: the message-security assist is installed
714 * Bit 19: the long-displacement facility is installed
715 * Bit 21: the extended-immediate facility is installed
716 * Bit 22: extended-translation facility 3 is installed
717 * Bit 30: extended-translation facility 3 enhancement facility
718 * These get translated to:
719 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
720 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
721 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
722 * HWCAP_S390_ETF3EH bit 8 (22 && 30).
724 for (i
= 0; i
< 6; i
++)
725 if (test_facility(stfl_bits
[i
]))
726 elf_hwcap
|= 1UL << i
;
728 if (test_facility(22) && test_facility(30))
729 elf_hwcap
|= HWCAP_S390_ETF3EH
;
732 * Check for additional facilities with store-facility-list-extended.
733 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
734 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
735 * as stored by stfl, bits 32-xxx contain additional facilities.
736 * How many facility words are stored depends on the number of
737 * doublewords passed to the instruction. The additional facilities
739 * Bit 42: decimal floating point facility is installed
740 * Bit 44: perform floating point operation facility is installed
742 * HWCAP_S390_DFP bit 6 (42 && 44).
744 if ((elf_hwcap
& (1UL << 2)) && test_facility(42) && test_facility(44))
745 elf_hwcap
|= HWCAP_S390_DFP
;
748 * Huge page support HWCAP_S390_HPAGE is bit 7.
750 if (MACHINE_HAS_EDAT1
)
751 elf_hwcap
|= HWCAP_S390_HPAGE
;
754 * 64-bit register support for 31-bit processes
755 * HWCAP_S390_HIGH_GPRS is bit 9.
757 elf_hwcap
|= HWCAP_S390_HIGH_GPRS
;
760 * Transactional execution support HWCAP_S390_TE is bit 10.
763 elf_hwcap
|= HWCAP_S390_TE
;
766 * Vector extension HWCAP_S390_VXRS is bit 11. The Vector extension
767 * can be disabled with the "novx" parameter. Use MACHINE_HAS_VX
768 * instead of facility bit 129.
770 if (MACHINE_HAS_VX
) {
771 elf_hwcap
|= HWCAP_S390_VXRS
;
772 if (test_facility(134))
773 elf_hwcap
|= HWCAP_S390_VXRS_EXT
;
774 if (test_facility(135))
775 elf_hwcap
|= HWCAP_S390_VXRS_BCD
;
779 * Guarded storage support HWCAP_S390_GS is bit 12.
782 elf_hwcap
|= HWCAP_S390_GS
;
785 add_device_randomness(&cpu_id
, sizeof(cpu_id
));
786 switch (cpu_id
.machine
) {
789 default: /* Use "z900" as default for 64 bit kernels. */
790 strcpy(elf_platform
, "z900");
794 strcpy(elf_platform
, "z990");
798 strcpy(elf_platform
, "z9-109");
802 strcpy(elf_platform
, "z10");
806 strcpy(elf_platform
, "z196");
810 strcpy(elf_platform
, "zEC12");
814 strcpy(elf_platform
, "z13");
817 strcpy(elf_platform
, "z14");
822 * Virtualization support HWCAP_INT_SIE is bit 0.
825 int_hwcap
|= HWCAP_INT_SIE
;
829 arch_initcall(setup_hwcaps
);
832 * Add system information as device randomness
834 static void __init
setup_randomness(void)
836 struct sysinfo_3_2_2
*vmms
;
838 vmms
= (struct sysinfo_3_2_2
*) memblock_alloc(PAGE_SIZE
, PAGE_SIZE
);
839 if (stsi(vmms
, 3, 2, 2) == 0 && vmms
->count
)
840 add_device_randomness(&vmms
->vm
, sizeof(vmms
->vm
[0]) * vmms
->count
);
841 memblock_free((unsigned long) vmms
, PAGE_SIZE
);
845 * Find the correct size for the task_struct. This depends on
846 * the size of the struct fpu at the end of the thread_struct
847 * which is embedded in the task_struct.
849 static void __init
setup_task_size(void)
851 int task_size
= sizeof(struct task_struct
);
853 if (!MACHINE_HAS_VX
) {
854 task_size
-= sizeof(__vector128
) * __NUM_VXRS
;
855 task_size
+= sizeof(freg_t
) * __NUM_FPRS
;
857 arch_task_struct_size
= task_size
;
861 * Setup function called from init/main.c just after the banner
865 void __init
setup_arch(char **cmdline_p
)
868 * print what head.S has found out about the machine
871 pr_info("Linux is running as a z/VM "
872 "guest operating system in 64-bit mode\n");
873 else if (MACHINE_IS_KVM
)
874 pr_info("Linux is running under KVM in 64-bit mode\n");
875 else if (MACHINE_IS_LPAR
)
876 pr_info("Linux is running natively in 64-bit mode\n");
878 /* Have one command line that is parsed and saved in /proc/cmdline */
879 /* boot_command_line has been already set up in early.c */
880 *cmdline_p
= boot_command_line
;
882 ROOT_DEV
= Root_RAM0
;
884 /* Is init_mm really needed? */
885 init_mm
.start_code
= PAGE_OFFSET
;
886 init_mm
.end_code
= (unsigned long) &_etext
;
887 init_mm
.end_data
= (unsigned long) &_edata
;
888 init_mm
.brk
= (unsigned long) &_end
;
891 #ifdef CONFIG_CRASH_DUMP
892 /* Deactivate elfcorehdr= kernel parameter */
893 elfcorehdr_addr
= ELFCORE_ADDR_MAX
;
900 /* Do some memory reservations *before* memory is added to memblock */
901 reserve_memory_end();
905 memblock_allow_resize();
907 /* Get information about *all* installed memory */
908 detect_memory_memblock();
913 * Make sure all chunks are MAX_ORDER aligned so we don't need the
914 * extra checks that HOLES_IN_ZONE would require.
916 * Is this still required?
918 memblock_trim_memory(1UL << (MAX_ORDER
- 1 + PAGE_SHIFT
));
922 dma_contiguous_reserve(memory_end
);
926 reserve_crashkernel();
927 #ifdef CONFIG_CRASH_DUMP
929 * Be aware that smp_save_dump_cpus() triggers a system reset.
930 * Therefore CPU and device initialization should be done afterwards.
932 smp_save_dump_cpus();
937 smp_fill_possible_mask();
938 cpu_detect_mhz_feature();
942 topology_init_early();
945 * Create kernel page tables and switch to virtual addressing.
949 /* Setup default console */
951 set_preferred_console();
953 apply_alternative_instructions();
955 /* Setup zfcpdump support */
958 /* Add system specific data to the random pool */