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/kernel.h>
22 #include <linux/memblock.h>
24 #include <linux/stddef.h>
25 #include <linux/unistd.h>
26 #include <linux/ptrace.h>
27 #include <linux/user.h>
28 #include <linux/tty.h>
29 #include <linux/ioport.h>
30 #include <linux/delay.h>
31 #include <linux/init.h>
32 #include <linux/initrd.h>
33 #include <linux/bootmem.h>
34 #include <linux/root_dev.h>
35 #include <linux/console.h>
36 #include <linux/kernel_stat.h>
37 #include <linux/device.h>
38 #include <linux/notifier.h>
39 #include <linux/pfn.h>
40 #include <linux/ctype.h>
41 #include <linux/reboot.h>
42 #include <linux/topology.h>
43 #include <linux/ftrace.h>
44 #include <linux/kexec.h>
45 #include <linux/crash_dump.h>
46 #include <linux/memory.h>
47 #include <linux/compat.h>
50 #include <asm/uaccess.h>
51 #include <asm/facility.h>
53 #include <asm/mmu_context.h>
54 #include <asm/cpcmd.h>
55 #include <asm/lowcore.h>
58 #include <asm/ptrace.h>
59 #include <asm/sections.h>
60 #include <asm/ebcdic.h>
61 #include <asm/kvm_virtio.h>
63 #include <asm/os_info.h>
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 unsigned long VMALLOC_START
;
94 EXPORT_SYMBOL(VMALLOC_START
);
96 unsigned long VMALLOC_END
;
97 EXPORT_SYMBOL(VMALLOC_END
);
100 EXPORT_SYMBOL(vmemmap
);
103 unsigned long MODULES_VADDR
;
104 unsigned long MODULES_END
;
107 /* An array with a pointer to the lowcore of every CPU. */
108 struct _lowcore
*lowcore_ptr
[NR_CPUS
];
109 EXPORT_SYMBOL(lowcore_ptr
);
112 * This is set up by the setup-routine at boot-time
113 * for S390 need to find out, what we have to setup
114 * using address 0x10400 ...
117 #include <asm/setup.h>
120 * condev= and conmode= setup parameter.
123 static int __init
condev_setup(char *str
)
127 vdev
= simple_strtoul(str
, &str
, 0);
128 if (vdev
>= 0 && vdev
< 65536) {
129 console_devno
= vdev
;
135 __setup("condev=", condev_setup
);
137 static void __init
set_preferred_console(void)
139 if (MACHINE_IS_KVM
) {
140 if (sclp_has_vt220())
141 add_preferred_console("ttyS", 1, NULL
);
142 else if (sclp_has_linemode())
143 add_preferred_console("ttyS", 0, NULL
);
145 add_preferred_console("hvc", 0, NULL
);
146 } else if (CONSOLE_IS_3215
|| CONSOLE_IS_SCLP
)
147 add_preferred_console("ttyS", 0, NULL
);
148 else if (CONSOLE_IS_3270
)
149 add_preferred_console("tty3270", 0, NULL
);
152 static int __init
conmode_setup(char *str
)
154 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
155 if (strncmp(str
, "hwc", 4) == 0 || strncmp(str
, "sclp", 5) == 0)
158 #if defined(CONFIG_TN3215_CONSOLE)
159 if (strncmp(str
, "3215", 5) == 0)
162 #if defined(CONFIG_TN3270_CONSOLE)
163 if (strncmp(str
, "3270", 5) == 0)
166 set_preferred_console();
170 __setup("conmode=", conmode_setup
);
172 static void __init
conmode_default(void)
174 char query_buffer
[1024];
178 cpcmd("QUERY CONSOLE", query_buffer
, 1024, NULL
);
179 console_devno
= simple_strtoul(query_buffer
+ 5, NULL
, 16);
180 ptr
= strstr(query_buffer
, "SUBCHANNEL =");
181 console_irq
= simple_strtoul(ptr
+ 13, NULL
, 16);
182 cpcmd("QUERY TERM", query_buffer
, 1024, NULL
);
183 ptr
= strstr(query_buffer
, "CONMODE");
185 * Set the conmode to 3215 so that the device recognition
186 * will set the cu_type of the console to 3215. If the
187 * conmode is 3270 and we don't set it back then both
188 * 3215 and the 3270 driver will try to access the console
189 * device (3215 as console and 3270 as normal tty).
191 cpcmd("TERM CONMODE 3215", NULL
, 0, NULL
);
193 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
198 if (strncmp(ptr
+ 8, "3270", 4) == 0) {
199 #if defined(CONFIG_TN3270_CONSOLE)
201 #elif defined(CONFIG_TN3215_CONSOLE)
203 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
206 } else if (strncmp(ptr
+ 8, "3215", 4) == 0) {
207 #if defined(CONFIG_TN3215_CONSOLE)
209 #elif defined(CONFIG_TN3270_CONSOLE)
211 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
216 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
222 #ifdef CONFIG_ZFCPDUMP
223 static void __init
setup_zfcpdump(void)
225 if (ipl_info
.type
!= IPL_TYPE_FCP_DUMP
)
229 strcat(boot_command_line
, " cio_ignore=all,!ipldev,!condev");
230 console_loglevel
= 2;
233 static inline void setup_zfcpdump(void) {}
234 #endif /* CONFIG_ZFCPDUMP */
237 * Reboot, halt and power_off stubs. They just call _machine_restart,
238 * _machine_halt or _machine_power_off.
241 void machine_restart(char *command
)
243 if ((!in_interrupt() && !in_atomic()) || oops_in_progress
)
245 * Only unblank the console if we are called in enabled
246 * context or a bust_spinlocks cleared the way for us.
249 _machine_restart(command
);
252 void machine_halt(void)
254 if (!in_interrupt() || oops_in_progress
)
256 * Only unblank the console if we are called in enabled
257 * context or a bust_spinlocks cleared the way for us.
263 void machine_power_off(void)
265 if (!in_interrupt() || oops_in_progress
)
267 * Only unblank the console if we are called in enabled
268 * context or a bust_spinlocks cleared the way for us.
271 _machine_power_off();
275 * Dummy power off function.
277 void (*pm_power_off
)(void) = machine_power_off
;
278 EXPORT_SYMBOL_GPL(pm_power_off
);
280 static int __init
early_parse_mem(char *p
)
282 memory_end
= memparse(p
, &p
);
286 early_param("mem", early_parse_mem
);
288 static int __init
parse_vmalloc(char *arg
)
292 VMALLOC_END
= (memparse(arg
, &arg
) + PAGE_SIZE
- 1) & PAGE_MASK
;
295 early_param("vmalloc", parse_vmalloc
);
297 static int __init
early_parse_user_mode(char *p
)
299 if (!p
|| strcmp(p
, "primary") == 0)
303 early_param("user_mode", early_parse_user_mode
);
305 void *restart_stack
__attribute__((__section__(".data")));
307 static void __init
setup_lowcore(void)
312 * Setup lowcore for boot cpu
314 BUILD_BUG_ON(sizeof(struct _lowcore
) != LC_PAGES
* 4096);
315 lc
= __alloc_bootmem_low(LC_PAGES
* PAGE_SIZE
, LC_PAGES
* PAGE_SIZE
, 0);
316 lc
->restart_psw
.mask
= PSW_KERNEL_BITS
;
317 lc
->restart_psw
.addr
=
318 PSW_ADDR_AMODE
| (unsigned long) restart_int_handler
;
319 lc
->external_new_psw
.mask
= PSW_KERNEL_BITS
|
320 PSW_MASK_DAT
| PSW_MASK_MCHECK
;
321 lc
->external_new_psw
.addr
=
322 PSW_ADDR_AMODE
| (unsigned long) ext_int_handler
;
323 lc
->svc_new_psw
.mask
= PSW_KERNEL_BITS
|
324 PSW_MASK_DAT
| PSW_MASK_IO
| PSW_MASK_EXT
| PSW_MASK_MCHECK
;
325 lc
->svc_new_psw
.addr
= PSW_ADDR_AMODE
| (unsigned long) system_call
;
326 lc
->program_new_psw
.mask
= PSW_KERNEL_BITS
|
327 PSW_MASK_DAT
| PSW_MASK_MCHECK
;
328 lc
->program_new_psw
.addr
=
329 PSW_ADDR_AMODE
| (unsigned long) pgm_check_handler
;
330 lc
->mcck_new_psw
.mask
= PSW_KERNEL_BITS
;
331 lc
->mcck_new_psw
.addr
=
332 PSW_ADDR_AMODE
| (unsigned long) mcck_int_handler
;
333 lc
->io_new_psw
.mask
= PSW_KERNEL_BITS
|
334 PSW_MASK_DAT
| PSW_MASK_MCHECK
;
335 lc
->io_new_psw
.addr
= PSW_ADDR_AMODE
| (unsigned long) io_int_handler
;
336 lc
->clock_comparator
= -1ULL;
337 lc
->kernel_stack
= ((unsigned long) &init_thread_union
)
338 + THREAD_SIZE
- STACK_FRAME_OVERHEAD
- sizeof(struct pt_regs
);
339 lc
->async_stack
= (unsigned long)
340 __alloc_bootmem(ASYNC_SIZE
, ASYNC_SIZE
, 0)
341 + ASYNC_SIZE
- STACK_FRAME_OVERHEAD
- sizeof(struct pt_regs
);
342 lc
->panic_stack
= (unsigned long)
343 __alloc_bootmem(PAGE_SIZE
, PAGE_SIZE
, 0)
344 + PAGE_SIZE
- STACK_FRAME_OVERHEAD
- sizeof(struct pt_regs
);
345 lc
->current_task
= (unsigned long) init_thread_union
.thread_info
.task
;
346 lc
->thread_info
= (unsigned long) &init_thread_union
;
347 lc
->machine_flags
= S390_lowcore
.machine_flags
;
348 lc
->stfl_fac_list
= S390_lowcore
.stfl_fac_list
;
349 memcpy(lc
->stfle_fac_list
, S390_lowcore
.stfle_fac_list
,
352 if (MACHINE_HAS_IEEE
) {
353 lc
->extended_save_area_addr
= (__u32
)
354 __alloc_bootmem_low(PAGE_SIZE
, PAGE_SIZE
, 0);
355 /* enable extended save area */
356 __ctl_set_bit(14, 29);
359 lc
->vdso_per_cpu_data
= (unsigned long) &lc
->paste
[0];
361 lc
->sync_enter_timer
= S390_lowcore
.sync_enter_timer
;
362 lc
->async_enter_timer
= S390_lowcore
.async_enter_timer
;
363 lc
->exit_timer
= S390_lowcore
.exit_timer
;
364 lc
->user_timer
= S390_lowcore
.user_timer
;
365 lc
->system_timer
= S390_lowcore
.system_timer
;
366 lc
->steal_timer
= S390_lowcore
.steal_timer
;
367 lc
->last_update_timer
= S390_lowcore
.last_update_timer
;
368 lc
->last_update_clock
= S390_lowcore
.last_update_clock
;
369 lc
->ftrace_func
= S390_lowcore
.ftrace_func
;
371 restart_stack
= __alloc_bootmem(ASYNC_SIZE
, ASYNC_SIZE
, 0);
372 restart_stack
+= ASYNC_SIZE
;
375 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant
376 * restart data to the absolute zero lowcore. This is necesary if
377 * PSW restart is done on an offline CPU that has lowcore zero.
379 lc
->restart_stack
= (unsigned long) restart_stack
;
380 lc
->restart_fn
= (unsigned long) do_restart
;
381 lc
->restart_data
= 0;
382 lc
->restart_source
= -1UL;
384 /* Setup absolute zero lowcore */
385 mem_assign_absolute(S390_lowcore
.restart_stack
, lc
->restart_stack
);
386 mem_assign_absolute(S390_lowcore
.restart_fn
, lc
->restart_fn
);
387 mem_assign_absolute(S390_lowcore
.restart_data
, lc
->restart_data
);
388 mem_assign_absolute(S390_lowcore
.restart_source
, lc
->restart_source
);
389 mem_assign_absolute(S390_lowcore
.restart_psw
, lc
->restart_psw
);
391 set_prefix((u32
)(unsigned long) lc
);
395 static struct resource code_resource
= {
396 .name
= "Kernel code",
397 .flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
,
400 static struct resource data_resource
= {
401 .name
= "Kernel data",
402 .flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
,
405 static struct resource bss_resource
= {
406 .name
= "Kernel bss",
407 .flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
,
410 static struct resource __initdata
*standard_resources
[] = {
416 static void __init
setup_resources(void)
418 struct resource
*res
, *std_res
, *sub_res
;
421 code_resource
.start
= (unsigned long) &_text
;
422 code_resource
.end
= (unsigned long) &_etext
- 1;
423 data_resource
.start
= (unsigned long) &_etext
;
424 data_resource
.end
= (unsigned long) &_edata
- 1;
425 bss_resource
.start
= (unsigned long) &__bss_start
;
426 bss_resource
.end
= (unsigned long) &__bss_stop
- 1;
428 for (i
= 0; i
< MEMORY_CHUNKS
; i
++) {
429 if (!memory_chunk
[i
].size
)
431 res
= alloc_bootmem_low(sizeof(*res
));
432 res
->flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
;
433 switch (memory_chunk
[i
].type
) {
434 case CHUNK_READ_WRITE
:
435 res
->name
= "System RAM";
437 case CHUNK_READ_ONLY
:
438 res
->name
= "System ROM";
439 res
->flags
|= IORESOURCE_READONLY
;
442 res
->name
= "reserved";
444 res
->start
= memory_chunk
[i
].addr
;
445 res
->end
= res
->start
+ memory_chunk
[i
].size
- 1;
446 request_resource(&iomem_resource
, res
);
448 for (j
= 0; j
< ARRAY_SIZE(standard_resources
); j
++) {
449 std_res
= standard_resources
[j
];
450 if (std_res
->start
< res
->start
||
451 std_res
->start
> res
->end
)
453 if (std_res
->end
> res
->end
) {
454 sub_res
= alloc_bootmem_low(sizeof(*sub_res
));
456 sub_res
->end
= res
->end
;
457 std_res
->start
= res
->end
+ 1;
458 request_resource(res
, sub_res
);
460 request_resource(res
, std_res
);
466 static void __init
setup_memory_end(void)
468 unsigned long vmax
, vmalloc_size
, tmp
;
469 unsigned long real_memory_size
= 0;
473 #ifdef CONFIG_ZFCPDUMP
474 if (ipl_info
.type
== IPL_TYPE_FCP_DUMP
&& !OLDMEM_BASE
) {
475 memory_end
= ZFCPDUMP_HSA_SIZE
;
479 memory_end
&= PAGE_MASK
;
482 * Make sure all chunks are MAX_ORDER aligned so we don't need the
483 * extra checks that HOLES_IN_ZONE would require.
485 for (i
= 0; i
< MEMORY_CHUNKS
; i
++) {
486 unsigned long start
, end
;
487 struct mem_chunk
*chunk
;
490 chunk
= &memory_chunk
[i
];
493 align
= 1UL << (MAX_ORDER
+ PAGE_SHIFT
- 1);
494 start
= (chunk
->addr
+ align
- 1) & ~(align
- 1);
495 end
= (chunk
->addr
+ chunk
->size
) & ~(align
- 1);
497 memset(chunk
, 0, sizeof(*chunk
));
500 chunk
->size
= end
- start
;
502 real_memory_size
= max(real_memory_size
,
503 chunk
->addr
+ chunk
->size
);
506 /* Choose kernel address space layout: 2, 3, or 4 levels. */
508 vmalloc_size
= VMALLOC_END
?: (128UL << 30) - MODULES_LEN
;
509 tmp
= (memory_end
?: real_memory_size
) / PAGE_SIZE
;
510 tmp
= tmp
* (sizeof(struct page
) + PAGE_SIZE
) + vmalloc_size
;
511 if (tmp
<= (1UL << 42))
512 vmax
= 1UL << 42; /* 3-level kernel page table */
514 vmax
= 1UL << 53; /* 4-level kernel page table */
515 /* module area is at the end of the kernel address space. */
517 MODULES_VADDR
= MODULES_END
- MODULES_LEN
;
518 VMALLOC_END
= MODULES_VADDR
;
520 vmalloc_size
= VMALLOC_END
?: 96UL << 20;
521 vmax
= 1UL << 31; /* 2-level kernel page table */
522 /* vmalloc area is at the end of the kernel address space. */
525 VMALLOC_START
= vmax
- vmalloc_size
;
527 /* Split remaining virtual space between 1:1 mapping & vmemmap array */
528 tmp
= VMALLOC_START
/ (PAGE_SIZE
+ sizeof(struct page
));
529 /* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */
530 tmp
= SECTION_ALIGN_UP(tmp
);
531 tmp
= VMALLOC_START
- tmp
* sizeof(struct page
);
532 tmp
&= ~((vmax
>> 11) - 1); /* align to page table level */
533 tmp
= min(tmp
, 1UL << MAX_PHYSMEM_BITS
);
534 vmemmap
= (struct page
*) tmp
;
536 /* Take care that memory_end is set and <= vmemmap */
537 memory_end
= min(memory_end
?: real_memory_size
, tmp
);
539 /* Fixup memory chunk array to fit into 0..memory_end */
540 for (i
= 0; i
< MEMORY_CHUNKS
; i
++) {
541 struct mem_chunk
*chunk
= &memory_chunk
[i
];
545 if (chunk
->addr
>= memory_end
) {
546 memset(chunk
, 0, sizeof(*chunk
));
549 if (chunk
->addr
+ chunk
->size
> memory_end
)
550 chunk
->size
= memory_end
- chunk
->addr
;
554 static void __init
setup_vmcoreinfo(void)
556 mem_assign_absolute(S390_lowcore
.vmcore_info
, paddr_vmcoreinfo_note());
559 #ifdef CONFIG_CRASH_DUMP
562 * Find suitable location for crashkernel memory
564 static unsigned long __init
find_crash_base(unsigned long crash_size
,
567 unsigned long crash_base
;
568 struct mem_chunk
*chunk
;
571 if (memory_chunk
[0].size
< crash_size
) {
572 *msg
= "first memory chunk must be at least crashkernel size";
575 if (OLDMEM_BASE
&& crash_size
== OLDMEM_SIZE
)
578 for (i
= MEMORY_CHUNKS
- 1; i
>= 0; i
--) {
579 chunk
= &memory_chunk
[i
];
580 if (chunk
->size
== 0)
582 if (chunk
->type
!= CHUNK_READ_WRITE
)
584 if (chunk
->size
< crash_size
)
586 crash_base
= (chunk
->addr
+ chunk
->size
) - crash_size
;
587 if (crash_base
< crash_size
)
589 if (crash_base
< ZFCPDUMP_HSA_SIZE_MAX
)
591 if (crash_base
< (unsigned long) INITRD_START
+ INITRD_SIZE
)
595 *msg
= "no suitable area found";
600 * Check if crash_base and crash_size is valid
602 static int __init
verify_crash_base(unsigned long crash_base
,
603 unsigned long crash_size
,
606 struct mem_chunk
*chunk
;
610 * Because we do the swap to zero, we must have at least 'crash_size'
611 * bytes free space before crash_base
613 if (crash_size
> crash_base
) {
614 *msg
= "crashkernel offset must be greater than size";
618 /* First memory chunk must be at least crash_size */
619 if (memory_chunk
[0].size
< crash_size
) {
620 *msg
= "first memory chunk must be at least crashkernel size";
623 /* Check if we fit into the respective memory chunk */
624 for (i
= 0; i
< MEMORY_CHUNKS
; i
++) {
625 chunk
= &memory_chunk
[i
];
626 if (chunk
->size
== 0)
628 if (crash_base
< chunk
->addr
)
630 if (crash_base
>= chunk
->addr
+ chunk
->size
)
632 /* we have found the memory chunk */
633 if (crash_base
+ crash_size
> chunk
->addr
+ chunk
->size
) {
634 *msg
= "selected memory chunk is too small for "
635 "crashkernel memory";
640 *msg
= "invalid memory range specified";
645 * When kdump is enabled, we have to ensure that no memory from
646 * the area [0 - crashkernel memory size] and
647 * [crashk_res.start - crashk_res.end] is set offline.
649 static int kdump_mem_notifier(struct notifier_block
*nb
,
650 unsigned long action
, void *data
)
652 struct memory_notify
*arg
= data
;
654 if (arg
->start_pfn
< PFN_DOWN(resource_size(&crashk_res
)))
656 if (arg
->start_pfn
> PFN_DOWN(crashk_res
.end
))
658 if (arg
->start_pfn
+ arg
->nr_pages
- 1 < PFN_DOWN(crashk_res
.start
))
663 static struct notifier_block kdump_mem_nb
= {
664 .notifier_call
= kdump_mem_notifier
,
670 * Make sure that oldmem, where the dump is stored, is protected
672 static void reserve_oldmem(void)
674 #ifdef CONFIG_CRASH_DUMP
675 unsigned long real_size
= 0;
680 for (i
= 0; i
< MEMORY_CHUNKS
; i
++) {
681 struct mem_chunk
*chunk
= &memory_chunk
[i
];
683 real_size
= max(real_size
, chunk
->addr
+ chunk
->size
);
685 create_mem_hole(memory_chunk
, OLDMEM_BASE
, OLDMEM_SIZE
);
686 create_mem_hole(memory_chunk
, OLDMEM_SIZE
, real_size
- OLDMEM_SIZE
);
691 * Reserve memory for kdump kernel to be loaded with kexec
693 static void __init
reserve_crashkernel(void)
695 #ifdef CONFIG_CRASH_DUMP
696 unsigned long long crash_base
, crash_size
;
700 rc
= parse_crashkernel(boot_command_line
, memory_end
, &crash_size
,
702 if (rc
|| crash_size
== 0)
704 crash_base
= ALIGN(crash_base
, KEXEC_CRASH_MEM_ALIGN
);
705 crash_size
= ALIGN(crash_size
, KEXEC_CRASH_MEM_ALIGN
);
706 if (register_memory_notifier(&kdump_mem_nb
))
709 crash_base
= find_crash_base(crash_size
, &msg
);
711 pr_info("crashkernel reservation failed: %s\n", msg
);
712 unregister_memory_notifier(&kdump_mem_nb
);
715 if (verify_crash_base(crash_base
, crash_size
, &msg
)) {
716 pr_info("crashkernel reservation failed: %s\n", msg
);
717 unregister_memory_notifier(&kdump_mem_nb
);
720 if (!OLDMEM_BASE
&& MACHINE_IS_VM
)
721 diag10_range(PFN_DOWN(crash_base
), PFN_DOWN(crash_size
));
722 crashk_res
.start
= crash_base
;
723 crashk_res
.end
= crash_base
+ crash_size
- 1;
724 insert_resource(&iomem_resource
, &crashk_res
);
725 create_mem_hole(memory_chunk
, crash_base
, crash_size
);
726 pr_info("Reserving %lluMB of memory at %lluMB "
727 "for crashkernel (System RAM: %luMB)\n",
728 crash_size
>> 20, crash_base
>> 20, memory_end
>> 20);
729 os_info_crashkernel_add(crash_base
, crash_size
);
733 static void __init
setup_memory(void)
735 unsigned long bootmap_size
;
736 unsigned long start_pfn
, end_pfn
;
740 * partially used pages are not usable - thus
741 * we are rounding upwards:
743 start_pfn
= PFN_UP(__pa(&_end
));
744 end_pfn
= max_pfn
= PFN_DOWN(memory_end
);
746 #ifdef CONFIG_BLK_DEV_INITRD
748 * Move the initrd in case the bitmap of the bootmem allocater
749 * would overwrite it.
752 if (INITRD_START
&& INITRD_SIZE
) {
753 unsigned long bmap_size
;
756 bmap_size
= bootmem_bootmap_pages(end_pfn
- start_pfn
+ 1);
757 bmap_size
= PFN_PHYS(bmap_size
);
759 if (PFN_PHYS(start_pfn
) + bmap_size
> INITRD_START
) {
760 start
= PFN_PHYS(start_pfn
) + bmap_size
+ PAGE_SIZE
;
762 #ifdef CONFIG_CRASH_DUMP
764 /* Move initrd behind kdump oldmem */
765 if (start
+ INITRD_SIZE
> OLDMEM_BASE
&&
766 start
< OLDMEM_BASE
+ OLDMEM_SIZE
)
767 start
= OLDMEM_BASE
+ OLDMEM_SIZE
;
770 if (start
+ INITRD_SIZE
> memory_end
) {
771 pr_err("initrd extends beyond end of "
772 "memory (0x%08lx > 0x%08lx) "
773 "disabling initrd\n",
774 start
+ INITRD_SIZE
, memory_end
);
775 INITRD_START
= INITRD_SIZE
= 0;
777 pr_info("Moving initrd (0x%08lx -> "
778 "0x%08lx, size: %ld)\n",
779 INITRD_START
, start
, INITRD_SIZE
);
780 memmove((void *) start
, (void *) INITRD_START
,
782 INITRD_START
= start
;
789 * Initialize the boot-time allocator
791 bootmap_size
= init_bootmem(start_pfn
, end_pfn
);
794 * Register RAM areas with the bootmem allocator.
797 for (i
= 0; i
< MEMORY_CHUNKS
; i
++) {
798 unsigned long start_chunk
, end_chunk
, pfn
;
800 if (!memory_chunk
[i
].size
)
802 start_chunk
= PFN_DOWN(memory_chunk
[i
].addr
);
803 end_chunk
= start_chunk
+ PFN_DOWN(memory_chunk
[i
].size
);
804 end_chunk
= min(end_chunk
, end_pfn
);
805 if (start_chunk
>= end_chunk
)
807 memblock_add_node(PFN_PHYS(start_chunk
),
808 PFN_PHYS(end_chunk
- start_chunk
), 0);
809 pfn
= max(start_chunk
, start_pfn
);
810 storage_key_init_range(PFN_PHYS(pfn
), PFN_PHYS(end_chunk
));
813 psw_set_key(PAGE_DEFAULT_KEY
);
815 free_bootmem_with_active_regions(0, max_pfn
);
818 * Reserve memory used for lowcore/command line/kernel image.
820 reserve_bootmem(0, (unsigned long)_ehead
, BOOTMEM_DEFAULT
);
821 reserve_bootmem((unsigned long)_stext
,
822 PFN_PHYS(start_pfn
) - (unsigned long)_stext
,
825 * Reserve the bootmem bitmap itself as well. We do this in two
826 * steps (first step was init_bootmem()) because this catches
827 * the (very unlikely) case of us accidentally initializing the
828 * bootmem allocator with an invalid RAM area.
830 reserve_bootmem(start_pfn
<< PAGE_SHIFT
, bootmap_size
,
833 #ifdef CONFIG_CRASH_DUMP
834 if (crashk_res
.start
)
835 reserve_bootmem(crashk_res
.start
,
836 crashk_res
.end
- crashk_res
.start
+ 1,
838 if (is_kdump_kernel())
839 reserve_bootmem(elfcorehdr_addr
- OLDMEM_BASE
,
840 PAGE_ALIGN(elfcorehdr_size
), BOOTMEM_DEFAULT
);
842 #ifdef CONFIG_BLK_DEV_INITRD
843 if (INITRD_START
&& INITRD_SIZE
) {
844 if (INITRD_START
+ INITRD_SIZE
<= memory_end
) {
845 reserve_bootmem(INITRD_START
, INITRD_SIZE
,
847 initrd_start
= INITRD_START
;
848 initrd_end
= initrd_start
+ INITRD_SIZE
;
850 pr_err("initrd extends beyond end of "
851 "memory (0x%08lx > 0x%08lx) "
852 "disabling initrd\n",
853 initrd_start
+ INITRD_SIZE
, memory_end
);
854 initrd_start
= initrd_end
= 0;
861 * Setup hardware capabilities.
863 static void __init
setup_hwcaps(void)
865 static const int stfl_bits
[6] = { 0, 2, 7, 17, 19, 21 };
870 * The store facility list bits numbers as found in the principles
871 * of operation are numbered with bit 1UL<<31 as number 0 to
872 * bit 1UL<<0 as number 31.
873 * Bit 0: instructions named N3, "backported" to esa-mode
874 * Bit 2: z/Architecture mode is active
875 * Bit 7: the store-facility-list-extended facility is installed
876 * Bit 17: the message-security assist is installed
877 * Bit 19: the long-displacement facility is installed
878 * Bit 21: the extended-immediate facility is installed
879 * Bit 22: extended-translation facility 3 is installed
880 * Bit 30: extended-translation facility 3 enhancement facility
881 * These get translated to:
882 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
883 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
884 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
885 * HWCAP_S390_ETF3EH bit 8 (22 && 30).
887 for (i
= 0; i
< 6; i
++)
888 if (test_facility(stfl_bits
[i
]))
889 elf_hwcap
|= 1UL << i
;
891 if (test_facility(22) && test_facility(30))
892 elf_hwcap
|= HWCAP_S390_ETF3EH
;
895 * Check for additional facilities with store-facility-list-extended.
896 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
897 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
898 * as stored by stfl, bits 32-xxx contain additional facilities.
899 * How many facility words are stored depends on the number of
900 * doublewords passed to the instruction. The additional facilities
902 * Bit 42: decimal floating point facility is installed
903 * Bit 44: perform floating point operation facility is installed
905 * HWCAP_S390_DFP bit 6 (42 && 44).
907 if ((elf_hwcap
& (1UL << 2)) && test_facility(42) && test_facility(44))
908 elf_hwcap
|= HWCAP_S390_DFP
;
911 * Huge page support HWCAP_S390_HPAGE is bit 7.
913 if (MACHINE_HAS_HPAGE
)
914 elf_hwcap
|= HWCAP_S390_HPAGE
;
916 #if defined(CONFIG_64BIT)
918 * 64-bit register support for 31-bit processes
919 * HWCAP_S390_HIGH_GPRS is bit 9.
921 elf_hwcap
|= HWCAP_S390_HIGH_GPRS
;
924 * Transactional execution support HWCAP_S390_TE is bit 10.
926 if (test_facility(50) && test_facility(73))
927 elf_hwcap
|= HWCAP_S390_TE
;
931 switch (cpu_id
.machine
) {
933 #if !defined(CONFIG_64BIT)
934 default: /* Use "g5" as default for 31 bit kernels. */
936 strcpy(elf_platform
, "g5");
940 #if defined(CONFIG_64BIT)
941 default: /* Use "z900" as default for 64 bit kernels. */
943 strcpy(elf_platform
, "z900");
947 strcpy(elf_platform
, "z990");
951 strcpy(elf_platform
, "z9-109");
955 strcpy(elf_platform
, "z10");
959 strcpy(elf_platform
, "z196");
963 strcpy(elf_platform
, "zEC12");
969 * Setup function called from init/main.c just after the banner
973 void __init
setup_arch(char **cmdline_p
)
976 * print what head.S has found out about the machine
980 pr_info("Linux is running as a z/VM "
981 "guest operating system in 31-bit mode\n");
982 else if (MACHINE_IS_LPAR
)
983 pr_info("Linux is running natively in 31-bit mode\n");
984 if (MACHINE_HAS_IEEE
)
985 pr_info("The hardware system has IEEE compatible "
986 "floating point units\n");
988 pr_info("The hardware system has no IEEE compatible "
989 "floating point units\n");
990 #else /* CONFIG_64BIT */
992 pr_info("Linux is running as a z/VM "
993 "guest operating system in 64-bit mode\n");
994 else if (MACHINE_IS_KVM
)
995 pr_info("Linux is running under KVM in 64-bit mode\n");
996 else if (MACHINE_IS_LPAR
)
997 pr_info("Linux is running natively in 64-bit mode\n");
998 #endif /* CONFIG_64BIT */
1000 /* Have one command line that is parsed and saved in /proc/cmdline */
1001 /* boot_command_line has been already set up in early.c */
1002 *cmdline_p
= boot_command_line
;
1004 ROOT_DEV
= Root_RAM0
;
1006 init_mm
.start_code
= PAGE_OFFSET
;
1007 init_mm
.end_code
= (unsigned long) &_etext
;
1008 init_mm
.end_data
= (unsigned long) &_edata
;
1009 init_mm
.brk
= (unsigned long) &_end
;
1011 uaccess
= MACHINE_HAS_MVCOS
? uaccess_mvcos
: uaccess_pt
;
1013 parse_early_param();
1014 detect_memory_layout(memory_chunk
, memory_end
);
1019 reserve_crashkernel();
1026 s390_init_cpu_topology();
1029 * Setup capabilities (ELF_HWCAP & ELF_PLATFORM).
1034 * Create kernel page tables and switch to virtual addressing.
1038 /* Setup default console */
1040 set_preferred_console();
1042 /* Setup zfcpdump support */