2 * arch/s390/kernel/setup.c
5 * Copyright (C) IBM Corp. 1999,2010
6 * Author(s): Hartmut Penner (hp@de.ibm.com),
7 * Martin Schwidefsky (schwidefsky@de.ibm.com)
9 * Derived from "arch/i386/kernel/setup.c"
10 * Copyright (C) 1995, Linus Torvalds
14 * This file handles the architecture-dependent parts of initialization
17 #define KMSG_COMPONENT "setup"
18 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
20 #include <linux/errno.h>
21 #include <linux/module.h>
22 #include <linux/sched.h>
23 #include <linux/kernel.h>
25 #include <linux/stddef.h>
26 #include <linux/unistd.h>
27 #include <linux/ptrace.h>
28 #include <linux/user.h>
29 #include <linux/tty.h>
30 #include <linux/ioport.h>
31 #include <linux/delay.h>
32 #include <linux/init.h>
33 #include <linux/initrd.h>
34 #include <linux/bootmem.h>
35 #include <linux/root_dev.h>
36 #include <linux/console.h>
37 #include <linux/kernel_stat.h>
38 #include <linux/device.h>
39 #include <linux/notifier.h>
40 #include <linux/pfn.h>
41 #include <linux/ctype.h>
42 #include <linux/reboot.h>
43 #include <linux/topology.h>
44 #include <linux/ftrace.h>
45 #include <linux/kexec.h>
46 #include <linux/crash_dump.h>
47 #include <linux/memory.h>
50 #include <asm/uaccess.h>
51 #include <asm/system.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/compat.h>
62 #include <asm/kvm_virtio.h>
65 long psw_kernel_bits
= (PSW_BASE_BITS
| PSW_MASK_DAT
| PSW_ASC_PRIMARY
|
66 PSW_MASK_MCHECK
| PSW_DEFAULT_KEY
);
67 long psw_user_bits
= (PSW_BASE_BITS
| PSW_MASK_DAT
| PSW_ASC_HOME
|
68 PSW_MASK_IO
| PSW_MASK_EXT
| PSW_MASK_MCHECK
|
69 PSW_MASK_PSTATE
| PSW_DEFAULT_KEY
);
72 * User copy operations.
74 struct uaccess_ops uaccess
;
75 EXPORT_SYMBOL(uaccess
);
80 unsigned int console_mode
= 0;
81 EXPORT_SYMBOL(console_mode
);
83 unsigned int console_devno
= -1;
84 EXPORT_SYMBOL(console_devno
);
86 unsigned int console_irq
= -1;
87 EXPORT_SYMBOL(console_irq
);
89 unsigned long elf_hwcap
= 0;
90 char elf_platform
[ELF_PLATFORM_SIZE
];
92 struct mem_chunk __initdata memory_chunk
[MEMORY_CHUNKS
];
94 int __initdata memory_end_set
;
95 unsigned long __initdata memory_end
;
97 /* An array with a pointer to the lowcore of every CPU. */
98 struct _lowcore
*lowcore_ptr
[NR_CPUS
];
99 EXPORT_SYMBOL(lowcore_ptr
);
102 * This is set up by the setup-routine at boot-time
103 * for S390 need to find out, what we have to setup
104 * using address 0x10400 ...
107 #include <asm/setup.h>
110 * condev= and conmode= setup parameter.
113 static int __init
condev_setup(char *str
)
117 vdev
= simple_strtoul(str
, &str
, 0);
118 if (vdev
>= 0 && vdev
< 65536) {
119 console_devno
= vdev
;
125 __setup("condev=", condev_setup
);
127 static void __init
set_preferred_console(void)
130 add_preferred_console("hvc", 0, NULL
);
131 else if (CONSOLE_IS_3215
|| CONSOLE_IS_SCLP
)
132 add_preferred_console("ttyS", 0, NULL
);
133 else if (CONSOLE_IS_3270
)
134 add_preferred_console("tty3270", 0, NULL
);
137 static int __init
conmode_setup(char *str
)
139 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
140 if (strncmp(str
, "hwc", 4) == 0 || strncmp(str
, "sclp", 5) == 0)
143 #if defined(CONFIG_TN3215_CONSOLE)
144 if (strncmp(str
, "3215", 5) == 0)
147 #if defined(CONFIG_TN3270_CONSOLE)
148 if (strncmp(str
, "3270", 5) == 0)
151 set_preferred_console();
155 __setup("conmode=", conmode_setup
);
157 static void __init
conmode_default(void)
159 char query_buffer
[1024];
163 cpcmd("QUERY CONSOLE", query_buffer
, 1024, NULL
);
164 console_devno
= simple_strtoul(query_buffer
+ 5, NULL
, 16);
165 ptr
= strstr(query_buffer
, "SUBCHANNEL =");
166 console_irq
= simple_strtoul(ptr
+ 13, NULL
, 16);
167 cpcmd("QUERY TERM", query_buffer
, 1024, NULL
);
168 ptr
= strstr(query_buffer
, "CONMODE");
170 * Set the conmode to 3215 so that the device recognition
171 * will set the cu_type of the console to 3215. If the
172 * conmode is 3270 and we don't set it back then both
173 * 3215 and the 3270 driver will try to access the console
174 * device (3215 as console and 3270 as normal tty).
176 cpcmd("TERM CONMODE 3215", NULL
, 0, NULL
);
178 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
183 if (strncmp(ptr
+ 8, "3270", 4) == 0) {
184 #if defined(CONFIG_TN3270_CONSOLE)
186 #elif defined(CONFIG_TN3215_CONSOLE)
188 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
191 } else if (strncmp(ptr
+ 8, "3215", 4) == 0) {
192 #if defined(CONFIG_TN3215_CONSOLE)
194 #elif defined(CONFIG_TN3270_CONSOLE)
196 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
201 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
207 #ifdef CONFIG_ZFCPDUMP
208 static void __init
setup_zfcpdump(unsigned int console_devno
)
212 if (ipl_info
.type
!= IPL_TYPE_FCP_DUMP
)
214 if (console_devno
!= -1)
215 sprintf(str
, " cio_ignore=all,!0.0.%04x,!0.0.%04x",
216 ipl_info
.data
.fcp
.dev_id
.devno
, console_devno
);
218 sprintf(str
, " cio_ignore=all,!0.0.%04x",
219 ipl_info
.data
.fcp
.dev_id
.devno
);
220 strcat(boot_command_line
, str
);
221 console_loglevel
= 2;
224 static inline void setup_zfcpdump(unsigned int console_devno
) {}
225 #endif /* CONFIG_ZFCPDUMP */
228 * Reboot, halt and power_off stubs. They just call _machine_restart,
229 * _machine_halt or _machine_power_off.
232 void machine_restart(char *command
)
234 if ((!in_interrupt() && !in_atomic()) || oops_in_progress
)
236 * Only unblank the console if we are called in enabled
237 * context or a bust_spinlocks cleared the way for us.
240 _machine_restart(command
);
243 void machine_halt(void)
245 if (!in_interrupt() || 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.
254 void machine_power_off(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.
262 _machine_power_off();
266 * Dummy power off function.
268 void (*pm_power_off
)(void) = machine_power_off
;
270 static int __init
early_parse_mem(char *p
)
272 memory_end
= memparse(p
, &p
);
276 early_param("mem", early_parse_mem
);
278 unsigned int user_mode
= HOME_SPACE_MODE
;
279 EXPORT_SYMBOL_GPL(user_mode
);
281 static int set_amode_and_uaccess(unsigned long user_amode
,
282 unsigned long user32_amode
)
284 psw_user_bits
= PSW_BASE_BITS
| PSW_MASK_DAT
| user_amode
|
285 PSW_MASK_IO
| PSW_MASK_EXT
| PSW_MASK_MCHECK
|
286 PSW_MASK_PSTATE
| PSW_DEFAULT_KEY
;
288 psw_user32_bits
= PSW_BASE32_BITS
| PSW_MASK_DAT
| user_amode
|
289 PSW_MASK_IO
| PSW_MASK_EXT
| PSW_MASK_MCHECK
|
290 PSW_MASK_PSTATE
| PSW_DEFAULT_KEY
;
291 psw32_user_bits
= PSW32_BASE_BITS
| PSW32_MASK_DAT
| user32_amode
|
292 PSW32_MASK_IO
| PSW32_MASK_EXT
| PSW32_MASK_MCHECK
|
295 psw_kernel_bits
= PSW_BASE_BITS
| PSW_MASK_DAT
| PSW_ASC_HOME
|
296 PSW_MASK_MCHECK
| PSW_DEFAULT_KEY
;
298 if (MACHINE_HAS_MVCOS
) {
299 memcpy(&uaccess
, &uaccess_mvcos_switch
, sizeof(uaccess
));
302 memcpy(&uaccess
, &uaccess_pt
, sizeof(uaccess
));
308 * Switch kernel/user addressing modes?
310 static int __init
early_parse_switch_amode(char *p
)
312 user_mode
= PRIMARY_SPACE_MODE
;
315 early_param("switch_amode", early_parse_switch_amode
);
317 static int __init
early_parse_user_mode(char *p
)
319 if (p
&& strcmp(p
, "primary") == 0)
320 user_mode
= PRIMARY_SPACE_MODE
;
321 else if (!p
|| strcmp(p
, "home") == 0)
322 user_mode
= HOME_SPACE_MODE
;
327 early_param("user_mode", early_parse_user_mode
);
329 static void setup_addressing_mode(void)
331 if (user_mode
== PRIMARY_SPACE_MODE
) {
332 if (set_amode_and_uaccess(PSW_ASC_PRIMARY
, PSW32_ASC_PRIMARY
))
333 pr_info("Address spaces switched, "
334 "mvcos available\n");
336 pr_info("Address spaces switched, "
337 "mvcos not available\n");
347 * Setup lowcore for boot cpu
349 BUILD_BUG_ON(sizeof(struct _lowcore
) != LC_PAGES
* 4096);
350 lc
= __alloc_bootmem_low(LC_PAGES
* PAGE_SIZE
, LC_PAGES
* PAGE_SIZE
, 0);
351 lc
->restart_psw
.mask
= PSW_BASE_BITS
| PSW_DEFAULT_KEY
;
352 lc
->restart_psw
.addr
=
353 PSW_ADDR_AMODE
| (unsigned long) psw_restart_int_handler
;
354 if (user_mode
!= HOME_SPACE_MODE
)
355 lc
->restart_psw
.mask
|= PSW_ASC_HOME
;
356 lc
->external_new_psw
.mask
= psw_kernel_bits
;
357 lc
->external_new_psw
.addr
=
358 PSW_ADDR_AMODE
| (unsigned long) ext_int_handler
;
359 lc
->svc_new_psw
.mask
= psw_kernel_bits
| PSW_MASK_IO
| PSW_MASK_EXT
;
360 lc
->svc_new_psw
.addr
= PSW_ADDR_AMODE
| (unsigned long) system_call
;
361 lc
->program_new_psw
.mask
= psw_kernel_bits
;
362 lc
->program_new_psw
.addr
=
363 PSW_ADDR_AMODE
| (unsigned long)pgm_check_handler
;
364 lc
->mcck_new_psw
.mask
=
365 psw_kernel_bits
& ~PSW_MASK_MCHECK
& ~PSW_MASK_DAT
;
366 lc
->mcck_new_psw
.addr
=
367 PSW_ADDR_AMODE
| (unsigned long) mcck_int_handler
;
368 lc
->io_new_psw
.mask
= psw_kernel_bits
;
369 lc
->io_new_psw
.addr
= PSW_ADDR_AMODE
| (unsigned long) io_int_handler
;
370 lc
->clock_comparator
= -1ULL;
371 lc
->kernel_stack
= ((unsigned long) &init_thread_union
) + THREAD_SIZE
;
372 lc
->async_stack
= (unsigned long)
373 __alloc_bootmem(ASYNC_SIZE
, ASYNC_SIZE
, 0) + ASYNC_SIZE
;
374 lc
->panic_stack
= (unsigned long)
375 __alloc_bootmem(PAGE_SIZE
, PAGE_SIZE
, 0) + PAGE_SIZE
;
376 lc
->current_task
= (unsigned long) init_thread_union
.thread_info
.task
;
377 lc
->thread_info
= (unsigned long) &init_thread_union
;
378 lc
->machine_flags
= S390_lowcore
.machine_flags
;
379 lc
->stfl_fac_list
= S390_lowcore
.stfl_fac_list
;
380 memcpy(lc
->stfle_fac_list
, S390_lowcore
.stfle_fac_list
,
383 if (MACHINE_HAS_IEEE
) {
384 lc
->extended_save_area_addr
= (__u32
)
385 __alloc_bootmem_low(PAGE_SIZE
, PAGE_SIZE
, 0);
386 /* enable extended save area */
387 __ctl_set_bit(14, 29);
391 lc
->vdso_per_cpu_data
= (unsigned long) &lc
->paste
[0];
393 lc
->sync_enter_timer
= S390_lowcore
.sync_enter_timer
;
394 lc
->async_enter_timer
= S390_lowcore
.async_enter_timer
;
395 lc
->exit_timer
= S390_lowcore
.exit_timer
;
396 lc
->user_timer
= S390_lowcore
.user_timer
;
397 lc
->system_timer
= S390_lowcore
.system_timer
;
398 lc
->steal_timer
= S390_lowcore
.steal_timer
;
399 lc
->last_update_timer
= S390_lowcore
.last_update_timer
;
400 lc
->last_update_clock
= S390_lowcore
.last_update_clock
;
401 lc
->ftrace_func
= S390_lowcore
.ftrace_func
;
402 set_prefix((u32
)(unsigned long) lc
);
406 static struct resource code_resource
= {
407 .name
= "Kernel code",
408 .flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
,
411 static struct resource data_resource
= {
412 .name
= "Kernel data",
413 .flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
,
416 static struct resource bss_resource
= {
417 .name
= "Kernel bss",
418 .flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
,
421 static struct resource __initdata
*standard_resources
[] = {
427 static void __init
setup_resources(void)
429 struct resource
*res
, *std_res
, *sub_res
;
432 code_resource
.start
= (unsigned long) &_text
;
433 code_resource
.end
= (unsigned long) &_etext
- 1;
434 data_resource
.start
= (unsigned long) &_etext
;
435 data_resource
.end
= (unsigned long) &_edata
- 1;
436 bss_resource
.start
= (unsigned long) &__bss_start
;
437 bss_resource
.end
= (unsigned long) &__bss_stop
- 1;
439 for (i
= 0; i
< MEMORY_CHUNKS
; i
++) {
440 if (!memory_chunk
[i
].size
)
442 if (memory_chunk
[i
].type
== CHUNK_OLDMEM
||
443 memory_chunk
[i
].type
== CHUNK_CRASHK
)
445 res
= alloc_bootmem_low(sizeof(*res
));
446 res
->flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
;
447 switch (memory_chunk
[i
].type
) {
448 case CHUNK_READ_WRITE
:
449 res
->name
= "System RAM";
451 case CHUNK_READ_ONLY
:
452 res
->name
= "System ROM";
453 res
->flags
|= IORESOURCE_READONLY
;
456 res
->name
= "reserved";
458 res
->start
= memory_chunk
[i
].addr
;
459 res
->end
= res
->start
+ memory_chunk
[i
].size
- 1;
460 request_resource(&iomem_resource
, res
);
462 for (j
= 0; j
< ARRAY_SIZE(standard_resources
); j
++) {
463 std_res
= standard_resources
[j
];
464 if (std_res
->start
< res
->start
||
465 std_res
->start
> res
->end
)
467 if (std_res
->end
> res
->end
) {
468 sub_res
= alloc_bootmem_low(sizeof(*sub_res
));
470 sub_res
->end
= res
->end
;
471 std_res
->start
= res
->end
+ 1;
472 request_resource(res
, sub_res
);
474 request_resource(res
, std_res
);
480 unsigned long real_memory_size
;
481 EXPORT_SYMBOL_GPL(real_memory_size
);
483 static void __init
setup_memory_end(void)
485 unsigned long memory_size
;
486 unsigned long max_mem
;
490 #ifdef CONFIG_ZFCPDUMP
491 if (ipl_info
.type
== IPL_TYPE_FCP_DUMP
) {
492 memory_end
= ZFCPDUMP_HSA_SIZE
;
497 memory_end
&= PAGE_MASK
;
499 max_mem
= memory_end
? min(VMEM_MAX_PHYS
, memory_end
) : VMEM_MAX_PHYS
;
500 memory_end
= min(max_mem
, memory_end
);
503 * Make sure all chunks are MAX_ORDER aligned so we don't need the
504 * extra checks that HOLES_IN_ZONE would require.
506 for (i
= 0; i
< MEMORY_CHUNKS
; i
++) {
507 unsigned long start
, end
;
508 struct mem_chunk
*chunk
;
511 chunk
= &memory_chunk
[i
];
512 align
= 1UL << (MAX_ORDER
+ PAGE_SHIFT
- 1);
513 start
= (chunk
->addr
+ align
- 1) & ~(align
- 1);
514 end
= (chunk
->addr
+ chunk
->size
) & ~(align
- 1);
516 memset(chunk
, 0, sizeof(*chunk
));
519 chunk
->size
= end
- start
;
523 for (i
= 0; i
< MEMORY_CHUNKS
; i
++) {
524 struct mem_chunk
*chunk
= &memory_chunk
[i
];
526 real_memory_size
= max(real_memory_size
,
527 chunk
->addr
+ chunk
->size
);
528 if (chunk
->addr
>= max_mem
) {
529 memset(chunk
, 0, sizeof(*chunk
));
532 if (chunk
->addr
+ chunk
->size
> max_mem
)
533 chunk
->size
= max_mem
- chunk
->addr
;
534 memory_size
= max(memory_size
, chunk
->addr
+ chunk
->size
);
537 memory_end
= memory_size
;
540 void *restart_stack
__attribute__((__section__(".data")));
543 * Setup new PSW and allocate stack for PSW restart interrupt
545 static void __init
setup_restart_psw(void)
549 restart_stack
= __alloc_bootmem(ASYNC_SIZE
, ASYNC_SIZE
, 0);
550 restart_stack
+= ASYNC_SIZE
;
553 * Setup restart PSW for absolute zero lowcore. This is necesary
554 * if PSW restart is done on an offline CPU that has lowcore zero
556 psw
.mask
= PSW_BASE_BITS
| PSW_DEFAULT_KEY
;
557 psw
.addr
= PSW_ADDR_AMODE
| (unsigned long) psw_restart_int_handler
;
558 copy_to_absolute_zero(&S390_lowcore
.restart_psw
, &psw
, sizeof(psw
));
561 #ifdef CONFIG_CRASH_DUMP
564 * Find suitable location for crashkernel memory
566 static unsigned long __init
find_crash_base(unsigned long crash_size
,
569 unsigned long crash_base
;
570 struct mem_chunk
*chunk
;
573 if (memory_chunk
[0].size
< crash_size
) {
574 *msg
= "first memory chunk must be at least crashkernel size";
577 if (is_kdump_kernel() && (crash_size
== OLDMEM_SIZE
))
580 for (i
= MEMORY_CHUNKS
- 1; i
>= 0; i
--) {
581 chunk
= &memory_chunk
[i
];
582 if (chunk
->size
== 0)
584 if (chunk
->type
!= CHUNK_READ_WRITE
)
586 if (chunk
->size
< crash_size
)
588 crash_base
= (chunk
->addr
+ chunk
->size
) - crash_size
;
589 if (crash_base
< crash_size
)
591 if (crash_base
< ZFCPDUMP_HSA_SIZE_MAX
)
593 if (crash_base
< (unsigned long) INITRD_START
+ INITRD_SIZE
)
597 *msg
= "no suitable area found";
602 * Check if crash_base and crash_size is valid
604 static int __init
verify_crash_base(unsigned long crash_base
,
605 unsigned long crash_size
,
608 struct mem_chunk
*chunk
;
612 * Because we do the swap to zero, we must have at least 'crash_size'
613 * bytes free space before crash_base
615 if (crash_size
> crash_base
) {
616 *msg
= "crashkernel offset must be greater than size";
620 /* First memory chunk must be at least crash_size */
621 if (memory_chunk
[0].size
< crash_size
) {
622 *msg
= "first memory chunk must be at least crashkernel size";
625 /* Check if we fit into the respective memory chunk */
626 for (i
= 0; i
< MEMORY_CHUNKS
; i
++) {
627 chunk
= &memory_chunk
[i
];
628 if (chunk
->size
== 0)
630 if (crash_base
< chunk
->addr
)
632 if (crash_base
>= chunk
->addr
+ chunk
->size
)
634 /* we have found the memory chunk */
635 if (crash_base
+ crash_size
> chunk
->addr
+ chunk
->size
) {
636 *msg
= "selected memory chunk is too small for "
637 "crashkernel memory";
642 *msg
= "invalid memory range specified";
647 * Reserve kdump memory by creating a memory hole in the mem_chunk array
649 static void __init
reserve_kdump_bootmem(unsigned long addr
, unsigned long size
,
653 create_mem_hole(memory_chunk
, addr
, size
, type
);
657 * When kdump is enabled, we have to ensure that no memory from
658 * the area [0 - crashkernel memory size] is set offline
660 static int kdump_mem_notifier(struct notifier_block
*nb
,
661 unsigned long action
, void *data
)
663 struct memory_notify
*arg
= data
;
665 if (arg
->start_pfn
>= PFN_DOWN(crashk_res
.end
- crashk_res
.start
+ 1))
670 static struct notifier_block kdump_mem_nb
= {
671 .notifier_call
= kdump_mem_notifier
,
677 * Make sure that oldmem, where the dump is stored, is protected
679 static void reserve_oldmem(void)
681 #ifdef CONFIG_CRASH_DUMP
682 if (!is_kdump_kernel())
685 reserve_kdump_bootmem(OLDMEM_BASE
, OLDMEM_SIZE
, CHUNK_OLDMEM
);
686 reserve_kdump_bootmem(OLDMEM_SIZE
, memory_end
- OLDMEM_SIZE
,
688 if (OLDMEM_BASE
+ OLDMEM_SIZE
== real_memory_size
)
689 saved_max_pfn
= PFN_DOWN(OLDMEM_BASE
) - 1;
691 saved_max_pfn
= PFN_DOWN(real_memory_size
) - 1;
696 * Reserve memory for kdump kernel to be loaded with kexec
698 static void __init
reserve_crashkernel(void)
700 #ifdef CONFIG_CRASH_DUMP
701 unsigned long long crash_base
, crash_size
;
705 rc
= parse_crashkernel(boot_command_line
, memory_end
, &crash_size
,
707 if (rc
|| crash_size
== 0)
709 crash_base
= PAGE_ALIGN(crash_base
);
710 crash_size
= PAGE_ALIGN(crash_size
);
711 if (register_memory_notifier(&kdump_mem_nb
))
714 crash_base
= find_crash_base(crash_size
, &msg
);
716 pr_info("crashkernel reservation failed: %s\n", msg
);
717 unregister_memory_notifier(&kdump_mem_nb
);
720 if (verify_crash_base(crash_base
, crash_size
, &msg
)) {
721 pr_info("crashkernel reservation failed: %s\n", msg
);
722 unregister_memory_notifier(&kdump_mem_nb
);
725 if (!is_kdump_kernel() && MACHINE_IS_VM
)
726 diag10_range(PFN_DOWN(crash_base
), PFN_DOWN(crash_size
));
727 crashk_res
.start
= crash_base
;
728 crashk_res
.end
= crash_base
+ crash_size
- 1;
729 insert_resource(&iomem_resource
, &crashk_res
);
730 reserve_kdump_bootmem(crash_base
, crash_size
, CHUNK_READ_WRITE
);
731 pr_info("Reserving %lluMB of memory at %lluMB "
732 "for crashkernel (System RAM: %luMB)\n",
733 crash_size
>> 20, crash_base
>> 20, memory_end
>> 20);
740 unsigned long bootmap_size
;
741 unsigned long start_pfn
, end_pfn
;
745 * partially used pages are not usable - thus
746 * we are rounding upwards:
748 start_pfn
= PFN_UP(__pa(&_end
));
749 end_pfn
= max_pfn
= PFN_DOWN(memory_end
);
751 #ifdef CONFIG_BLK_DEV_INITRD
753 * Move the initrd in case the bitmap of the bootmem allocater
754 * would overwrite it.
757 if (INITRD_START
&& INITRD_SIZE
) {
758 unsigned long bmap_size
;
761 bmap_size
= bootmem_bootmap_pages(end_pfn
- start_pfn
+ 1);
762 bmap_size
= PFN_PHYS(bmap_size
);
764 if (PFN_PHYS(start_pfn
) + bmap_size
> INITRD_START
) {
765 start
= PFN_PHYS(start_pfn
) + bmap_size
+ PAGE_SIZE
;
767 #ifdef CONFIG_CRASH_DUMP
768 if (is_kdump_kernel()) {
769 /* Move initrd behind kdump oldmem */
770 if (start
+ INITRD_SIZE
> OLDMEM_BASE
&&
771 start
< OLDMEM_BASE
+ OLDMEM_SIZE
)
772 start
= OLDMEM_BASE
+ OLDMEM_SIZE
;
775 if (start
+ INITRD_SIZE
> memory_end
) {
776 pr_err("initrd extends beyond end of "
777 "memory (0x%08lx > 0x%08lx) "
778 "disabling initrd\n",
779 start
+ INITRD_SIZE
, memory_end
);
780 INITRD_START
= INITRD_SIZE
= 0;
782 pr_info("Moving initrd (0x%08lx -> "
783 "0x%08lx, size: %ld)\n",
784 INITRD_START
, start
, INITRD_SIZE
);
785 memmove((void *) start
, (void *) INITRD_START
,
787 INITRD_START
= start
;
794 * Initialize the boot-time allocator
796 bootmap_size
= init_bootmem(start_pfn
, end_pfn
);
799 * Register RAM areas with the bootmem allocator.
802 for (i
= 0; i
< MEMORY_CHUNKS
&& memory_chunk
[i
].size
> 0; i
++) {
803 unsigned long start_chunk
, end_chunk
, pfn
;
805 if (memory_chunk
[i
].type
!= CHUNK_READ_WRITE
)
807 start_chunk
= PFN_DOWN(memory_chunk
[i
].addr
);
808 end_chunk
= start_chunk
+ PFN_DOWN(memory_chunk
[i
].size
);
809 end_chunk
= min(end_chunk
, end_pfn
);
810 if (start_chunk
>= end_chunk
)
812 add_active_range(0, start_chunk
, end_chunk
);
813 pfn
= max(start_chunk
, start_pfn
);
814 for (; pfn
< end_chunk
; pfn
++)
815 page_set_storage_key(PFN_PHYS(pfn
),
816 PAGE_DEFAULT_KEY
, 0);
819 psw_set_key(PAGE_DEFAULT_KEY
);
821 free_bootmem_with_active_regions(0, max_pfn
);
824 * Reserve memory used for lowcore/command line/kernel image.
826 reserve_bootmem(0, (unsigned long)_ehead
, BOOTMEM_DEFAULT
);
827 reserve_bootmem((unsigned long)_stext
,
828 PFN_PHYS(start_pfn
) - (unsigned long)_stext
,
831 * Reserve the bootmem bitmap itself as well. We do this in two
832 * steps (first step was init_bootmem()) because this catches
833 * the (very unlikely) case of us accidentally initializing the
834 * bootmem allocator with an invalid RAM area.
836 reserve_bootmem(start_pfn
<< PAGE_SHIFT
, bootmap_size
,
839 #ifdef CONFIG_CRASH_DUMP
840 if (crashk_res
.start
)
841 reserve_bootmem(crashk_res
.start
,
842 crashk_res
.end
- crashk_res
.start
+ 1,
844 if (is_kdump_kernel())
845 reserve_bootmem(elfcorehdr_addr
- OLDMEM_BASE
,
846 PAGE_ALIGN(elfcorehdr_size
), BOOTMEM_DEFAULT
);
848 #ifdef CONFIG_BLK_DEV_INITRD
849 if (INITRD_START
&& INITRD_SIZE
) {
850 if (INITRD_START
+ INITRD_SIZE
<= memory_end
) {
851 reserve_bootmem(INITRD_START
, INITRD_SIZE
,
853 initrd_start
= INITRD_START
;
854 initrd_end
= initrd_start
+ INITRD_SIZE
;
856 pr_err("initrd extends beyond end of "
857 "memory (0x%08lx > 0x%08lx) "
858 "disabling initrd\n",
859 initrd_start
+ INITRD_SIZE
, memory_end
);
860 initrd_start
= initrd_end
= 0;
867 * Setup hardware capabilities.
869 static void __init
setup_hwcaps(void)
871 static const int stfl_bits
[6] = { 0, 2, 7, 17, 19, 21 };
876 * The store facility list bits numbers as found in the principles
877 * of operation are numbered with bit 1UL<<31 as number 0 to
878 * bit 1UL<<0 as number 31.
879 * Bit 0: instructions named N3, "backported" to esa-mode
880 * Bit 2: z/Architecture mode is active
881 * Bit 7: the store-facility-list-extended facility is installed
882 * Bit 17: the message-security assist is installed
883 * Bit 19: the long-displacement facility is installed
884 * Bit 21: the extended-immediate facility is installed
885 * Bit 22: extended-translation facility 3 is installed
886 * Bit 30: extended-translation facility 3 enhancement facility
887 * These get translated to:
888 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
889 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
890 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
891 * HWCAP_S390_ETF3EH bit 8 (22 && 30).
893 for (i
= 0; i
< 6; i
++)
894 if (test_facility(stfl_bits
[i
]))
895 elf_hwcap
|= 1UL << i
;
897 if (test_facility(22) && test_facility(30))
898 elf_hwcap
|= HWCAP_S390_ETF3EH
;
901 * Check for additional facilities with store-facility-list-extended.
902 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
903 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
904 * as stored by stfl, bits 32-xxx contain additional facilities.
905 * How many facility words are stored depends on the number of
906 * doublewords passed to the instruction. The additional facilities
908 * Bit 42: decimal floating point facility is installed
909 * Bit 44: perform floating point operation facility is installed
911 * HWCAP_S390_DFP bit 6 (42 && 44).
913 if ((elf_hwcap
& (1UL << 2)) && test_facility(42) && test_facility(44))
914 elf_hwcap
|= HWCAP_S390_DFP
;
917 * Huge page support HWCAP_S390_HPAGE is bit 7.
919 if (MACHINE_HAS_HPAGE
)
920 elf_hwcap
|= HWCAP_S390_HPAGE
;
923 * 64-bit register support for 31-bit processes
924 * HWCAP_S390_HIGH_GPRS is bit 9.
926 elf_hwcap
|= HWCAP_S390_HIGH_GPRS
;
929 switch (cpu_id
.machine
) {
931 #if !defined(CONFIG_64BIT)
932 default: /* Use "g5" as default for 31 bit kernels. */
934 strcpy(elf_platform
, "g5");
938 #if defined(CONFIG_64BIT)
939 default: /* Use "z900" as default for 64 bit kernels. */
941 strcpy(elf_platform
, "z900");
945 strcpy(elf_platform
, "z990");
949 strcpy(elf_platform
, "z9-109");
953 strcpy(elf_platform
, "z10");
957 strcpy(elf_platform
, "z196");
963 * Setup function called from init/main.c just after the banner
968 setup_arch(char **cmdline_p
)
971 * print what head.S has found out about the machine
975 pr_info("Linux is running as a z/VM "
976 "guest operating system in 31-bit mode\n");
977 else if (MACHINE_IS_LPAR
)
978 pr_info("Linux is running natively in 31-bit mode\n");
979 if (MACHINE_HAS_IEEE
)
980 pr_info("The hardware system has IEEE compatible "
981 "floating point units\n");
983 pr_info("The hardware system has no IEEE compatible "
984 "floating point units\n");
985 #else /* CONFIG_64BIT */
987 pr_info("Linux is running as a z/VM "
988 "guest operating system in 64-bit mode\n");
989 else if (MACHINE_IS_KVM
)
990 pr_info("Linux is running under KVM in 64-bit mode\n");
991 else if (MACHINE_IS_LPAR
)
992 pr_info("Linux is running natively in 64-bit mode\n");
993 #endif /* CONFIG_64BIT */
995 /* Have one command line that is parsed and saved in /proc/cmdline */
996 /* boot_command_line has been already set up in early.c */
997 *cmdline_p
= boot_command_line
;
999 ROOT_DEV
= Root_RAM0
;
1001 init_mm
.start_code
= PAGE_OFFSET
;
1002 init_mm
.end_code
= (unsigned long) &_etext
;
1003 init_mm
.end_data
= (unsigned long) &_edata
;
1004 init_mm
.brk
= (unsigned long) &_end
;
1006 if (MACHINE_HAS_MVCOS
)
1007 memcpy(&uaccess
, &uaccess_mvcos
, sizeof(uaccess
));
1009 memcpy(&uaccess
, &uaccess_std
, sizeof(uaccess
));
1011 parse_early_param();
1015 setup_addressing_mode();
1017 reserve_crashkernel();
1020 setup_restart_psw();
1024 s390_init_cpu_topology();
1027 * Setup capabilities (ELF_HWCAP & ELF_PLATFORM).
1032 * Create kernel page tables and switch to virtual addressing.
1036 /* Setup default console */
1038 set_preferred_console();
1040 /* Setup zfcpdump support */
1041 setup_zfcpdump(console_devno
);