1 // SPDX-License-Identifier: GPL-2.0
4 * Copyright IBM Corp. 1999, 2012
5 * Author(s): Hartmut Penner (hp@de.ibm.com),
6 * Martin Schwidefsky (schwidefsky@de.ibm.com)
8 * Derived from "arch/i386/kernel/setup.c"
9 * Copyright (C) 1995, Linus Torvalds
13 * This file handles the architecture-dependent parts of initialization
16 #define KMSG_COMPONENT "setup"
17 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
19 #include <linux/errno.h>
20 #include <linux/export.h>
21 #include <linux/sched.h>
22 #include <linux/sched/task.h>
23 #include <linux/cpu.h>
24 #include <linux/kernel.h>
25 #include <linux/memblock.h>
27 #include <linux/stddef.h>
28 #include <linux/unistd.h>
29 #include <linux/ptrace.h>
30 #include <linux/random.h>
31 #include <linux/user.h>
32 #include <linux/tty.h>
33 #include <linux/ioport.h>
34 #include <linux/delay.h>
35 #include <linux/init.h>
36 #include <linux/initrd.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>
51 #include <linux/start_kernel.h>
53 #include <asm/boot_data.h>
55 #include <asm/facility.h>
57 #include <asm/mmu_context.h>
58 #include <asm/cpcmd.h>
59 #include <asm/lowcore.h>
63 #include <asm/ptrace.h>
64 #include <asm/sections.h>
65 #include <asm/ebcdic.h>
67 #include <asm/os_info.h>
69 #include <asm/stacktrace.h>
70 #include <asm/sysinfo.h>
72 #include <asm/alternative.h>
73 #include <asm/nospec-branch.h>
74 #include <asm/mem_detect.h>
76 #include <asm/asm-offsets.h>
82 unsigned int console_mode
= 0;
83 EXPORT_SYMBOL(console_mode
);
85 unsigned int console_devno
= -1;
86 EXPORT_SYMBOL(console_devno
);
88 unsigned int console_irq
= -1;
89 EXPORT_SYMBOL(console_irq
);
91 unsigned long elf_hwcap __read_mostly
= 0;
92 char elf_platform
[ELF_PLATFORM_SIZE
];
94 unsigned long int_hwcap
= 0;
96 int __bootdata(noexec_disabled
);
97 int __bootdata(memory_end_set
);
98 unsigned long __bootdata(memory_end
);
99 unsigned long __bootdata(vmalloc_size
);
100 unsigned long __bootdata(max_physmem_end
);
101 struct mem_detect_info
__bootdata(mem_detect
);
103 struct exception_table_entry
*__bootdata_preserved(__start_dma_ex_table
);
104 struct exception_table_entry
*__bootdata_preserved(__stop_dma_ex_table
);
105 unsigned long __bootdata_preserved(__swsusp_reset_dma
);
106 unsigned long __bootdata_preserved(__stext_dma
);
107 unsigned long __bootdata_preserved(__etext_dma
);
108 unsigned long __bootdata_preserved(__sdma
);
109 unsigned long __bootdata_preserved(__edma
);
110 unsigned long __bootdata_preserved(__kaslr_offset
);
111 unsigned int __bootdata_preserved(zlib_dfltcc_support
);
112 EXPORT_SYMBOL(zlib_dfltcc_support
);
114 unsigned long VMALLOC_START
;
115 EXPORT_SYMBOL(VMALLOC_START
);
117 unsigned long VMALLOC_END
;
118 EXPORT_SYMBOL(VMALLOC_END
);
120 struct page
*vmemmap
;
121 EXPORT_SYMBOL(vmemmap
);
123 unsigned long MODULES_VADDR
;
124 unsigned long MODULES_END
;
126 /* An array with a pointer to the lowcore of every CPU. */
127 struct lowcore
*lowcore_ptr
[NR_CPUS
];
128 EXPORT_SYMBOL(lowcore_ptr
);
131 * This is set up by the setup-routine at boot-time
132 * for S390 need to find out, what we have to setup
133 * using address 0x10400 ...
136 #include <asm/setup.h>
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 void __init
set_preferred_console(void)
158 if (CONSOLE_IS_3215
|| CONSOLE_IS_SCLP
)
159 add_preferred_console("ttyS", 0, NULL
);
160 else if (CONSOLE_IS_3270
)
161 add_preferred_console("tty3270", 0, NULL
);
162 else if (CONSOLE_IS_VT220
)
163 add_preferred_console("ttyS", 1, NULL
);
164 else if (CONSOLE_IS_HVC
)
165 add_preferred_console("hvc", 0, NULL
);
168 static int __init
conmode_setup(char *str
)
170 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
171 if (!strcmp(str
, "hwc") || !strcmp(str
, "sclp"))
174 #if defined(CONFIG_TN3215_CONSOLE)
175 if (!strcmp(str
, "3215"))
178 #if defined(CONFIG_TN3270_CONSOLE)
179 if (!strcmp(str
, "3270"))
182 set_preferred_console();
186 __setup("conmode=", conmode_setup
);
188 static void __init
conmode_default(void)
190 char query_buffer
[1024];
194 cpcmd("QUERY CONSOLE", query_buffer
, 1024, NULL
);
195 console_devno
= simple_strtoul(query_buffer
+ 5, NULL
, 16);
196 ptr
= strstr(query_buffer
, "SUBCHANNEL =");
197 console_irq
= simple_strtoul(ptr
+ 13, NULL
, 16);
198 cpcmd("QUERY TERM", query_buffer
, 1024, NULL
);
199 ptr
= strstr(query_buffer
, "CONMODE");
201 * Set the conmode to 3215 so that the device recognition
202 * will set the cu_type of the console to 3215. If the
203 * conmode is 3270 and we don't set it back then both
204 * 3215 and the 3270 driver will try to access the console
205 * device (3215 as console and 3270 as normal tty).
207 cpcmd("TERM CONMODE 3215", NULL
, 0, NULL
);
209 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
214 if (str_has_prefix(ptr
+ 8, "3270")) {
215 #if defined(CONFIG_TN3270_CONSOLE)
217 #elif defined(CONFIG_TN3215_CONSOLE)
219 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
222 } else if (str_has_prefix(ptr
+ 8, "3215")) {
223 #if defined(CONFIG_TN3215_CONSOLE)
225 #elif defined(CONFIG_TN3270_CONSOLE)
227 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
231 } else if (MACHINE_IS_KVM
) {
232 if (sclp
.has_vt220
&& IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE
))
234 else if (sclp
.has_linemode
&& IS_ENABLED(CONFIG_SCLP_CONSOLE
))
239 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
245 #ifdef CONFIG_CRASH_DUMP
246 static void __init
setup_zfcpdump(void)
248 if (ipl_info
.type
!= IPL_TYPE_FCP_DUMP
)
252 strcat(boot_command_line
, " cio_ignore=all,!ipldev,!condev");
253 console_loglevel
= 2;
256 static inline void setup_zfcpdump(void) {}
257 #endif /* CONFIG_CRASH_DUMP */
260 * Reboot, halt and power_off stubs. They just call _machine_restart,
261 * _machine_halt or _machine_power_off.
264 void machine_restart(char *command
)
266 if ((!in_interrupt() && !in_atomic()) || oops_in_progress
)
268 * Only unblank the console if we are called in enabled
269 * context or a bust_spinlocks cleared the way for us.
272 _machine_restart(command
);
275 void machine_halt(void)
277 if (!in_interrupt() || oops_in_progress
)
279 * Only unblank the console if we are called in enabled
280 * context or a bust_spinlocks cleared the way for us.
286 void machine_power_off(void)
288 if (!in_interrupt() || oops_in_progress
)
290 * Only unblank the console if we are called in enabled
291 * context or a bust_spinlocks cleared the way for us.
294 _machine_power_off();
298 * Dummy power off function.
300 void (*pm_power_off
)(void) = machine_power_off
;
301 EXPORT_SYMBOL_GPL(pm_power_off
);
303 void *restart_stack
__section(.data
);
305 unsigned long stack_alloc(void)
307 #ifdef CONFIG_VMAP_STACK
308 return (unsigned long)
309 __vmalloc_node_range(THREAD_SIZE
, THREAD_SIZE
,
310 VMALLOC_START
, VMALLOC_END
,
312 PAGE_KERNEL
, 0, NUMA_NO_NODE
,
313 __builtin_return_address(0));
315 return __get_free_pages(GFP_KERNEL
, THREAD_SIZE_ORDER
);
319 void stack_free(unsigned long stack
)
321 #ifdef CONFIG_VMAP_STACK
322 vfree((void *) stack
);
324 free_pages(stack
, THREAD_SIZE_ORDER
);
328 int __init
arch_early_irq_init(void)
332 stack
= __get_free_pages(GFP_KERNEL
, THREAD_SIZE_ORDER
);
334 panic("Couldn't allocate async stack");
335 S390_lowcore
.async_stack
= stack
+ STACK_INIT_OFFSET
;
339 static int __init
async_stack_realloc(void)
341 unsigned long old
, new;
343 old
= S390_lowcore
.async_stack
- STACK_INIT_OFFSET
;
346 panic("Couldn't allocate async stack");
347 S390_lowcore
.async_stack
= new + STACK_INIT_OFFSET
;
348 free_pages(old
, THREAD_SIZE_ORDER
);
351 early_initcall(async_stack_realloc
);
353 void __init
arch_call_rest_init(void)
357 stack
= stack_alloc();
359 panic("Couldn't allocate kernel stack");
360 current
->stack
= (void *) stack
;
361 #ifdef CONFIG_VMAP_STACK
362 current
->stack_vm_area
= (void *) stack
;
364 set_task_stack_end_magic(current
);
365 stack
+= STACK_INIT_OFFSET
;
366 S390_lowcore
.kernel_stack
= stack
;
367 CALL_ON_STACK_NORETURN(rest_init
, stack
);
370 static void __init
setup_lowcore_dat_off(void)
375 * Setup lowcore for boot cpu
377 BUILD_BUG_ON(sizeof(struct lowcore
) != LC_PAGES
* PAGE_SIZE
);
378 lc
= memblock_alloc_low(sizeof(*lc
), sizeof(*lc
));
380 panic("%s: Failed to allocate %zu bytes align=%zx\n",
381 __func__
, sizeof(*lc
), sizeof(*lc
));
383 lc
->restart_psw
.mask
= PSW_KERNEL_BITS
;
384 lc
->restart_psw
.addr
= (unsigned long) restart_int_handler
;
385 lc
->external_new_psw
.mask
= PSW_KERNEL_BITS
| PSW_MASK_MCHECK
;
386 lc
->external_new_psw
.addr
= (unsigned long) ext_int_handler
;
387 lc
->svc_new_psw
.mask
= PSW_KERNEL_BITS
|
388 PSW_MASK_IO
| PSW_MASK_EXT
| PSW_MASK_MCHECK
;
389 lc
->svc_new_psw
.addr
= (unsigned long) system_call
;
390 lc
->program_new_psw
.mask
= PSW_KERNEL_BITS
| PSW_MASK_MCHECK
;
391 lc
->program_new_psw
.addr
= (unsigned long) pgm_check_handler
;
392 lc
->mcck_new_psw
.mask
= PSW_KERNEL_BITS
;
393 lc
->mcck_new_psw
.addr
= (unsigned long) mcck_int_handler
;
394 lc
->io_new_psw
.mask
= PSW_KERNEL_BITS
| PSW_MASK_MCHECK
;
395 lc
->io_new_psw
.addr
= (unsigned long) io_int_handler
;
396 lc
->clock_comparator
= clock_comparator_max
;
397 lc
->nodat_stack
= ((unsigned long) &init_thread_union
)
398 + THREAD_SIZE
- STACK_FRAME_OVERHEAD
- sizeof(struct pt_regs
);
399 lc
->current_task
= (unsigned long)&init_task
;
401 lc
->machine_flags
= S390_lowcore
.machine_flags
;
402 lc
->preempt_count
= S390_lowcore
.preempt_count
;
403 lc
->stfl_fac_list
= S390_lowcore
.stfl_fac_list
;
404 memcpy(lc
->stfle_fac_list
, S390_lowcore
.stfle_fac_list
,
405 sizeof(lc
->stfle_fac_list
));
406 memcpy(lc
->alt_stfle_fac_list
, S390_lowcore
.alt_stfle_fac_list
,
407 sizeof(lc
->alt_stfle_fac_list
));
408 nmi_alloc_boot_cpu(lc
);
409 vdso_alloc_boot_cpu(lc
);
410 lc
->sync_enter_timer
= S390_lowcore
.sync_enter_timer
;
411 lc
->async_enter_timer
= S390_lowcore
.async_enter_timer
;
412 lc
->exit_timer
= S390_lowcore
.exit_timer
;
413 lc
->user_timer
= S390_lowcore
.user_timer
;
414 lc
->system_timer
= S390_lowcore
.system_timer
;
415 lc
->steal_timer
= S390_lowcore
.steal_timer
;
416 lc
->last_update_timer
= S390_lowcore
.last_update_timer
;
417 lc
->last_update_clock
= S390_lowcore
.last_update_clock
;
420 * Allocate the global restart stack which is the same for
421 * all CPUs in cast *one* of them does a PSW restart.
423 restart_stack
= memblock_alloc(THREAD_SIZE
, THREAD_SIZE
);
425 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
426 __func__
, THREAD_SIZE
, THREAD_SIZE
);
427 restart_stack
+= STACK_INIT_OFFSET
;
430 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant
431 * restart data to the absolute zero lowcore. This is necessary if
432 * PSW restart is done on an offline CPU that has lowcore zero.
434 lc
->restart_stack
= (unsigned long) restart_stack
;
435 lc
->restart_fn
= (unsigned long) do_restart
;
436 lc
->restart_data
= 0;
437 lc
->restart_source
= -1UL;
439 /* Setup absolute zero lowcore */
440 mem_assign_absolute(S390_lowcore
.restart_stack
, lc
->restart_stack
);
441 mem_assign_absolute(S390_lowcore
.restart_fn
, lc
->restart_fn
);
442 mem_assign_absolute(S390_lowcore
.restart_data
, lc
->restart_data
);
443 mem_assign_absolute(S390_lowcore
.restart_source
, lc
->restart_source
);
444 mem_assign_absolute(S390_lowcore
.restart_psw
, lc
->restart_psw
);
446 lc
->spinlock_lockval
= arch_spin_lockval(0);
447 lc
->spinlock_index
= 0;
448 arch_spin_lock_setup(0);
449 lc
->br_r1_trampoline
= 0x07f1; /* br %r1 */
450 lc
->return_lpswe
= gen_lpswe(__LC_RETURN_PSW
);
451 lc
->return_mcck_lpswe
= gen_lpswe(__LC_RETURN_MCCK_PSW
);
453 set_prefix((u32
)(unsigned long) lc
);
457 static void __init
setup_lowcore_dat_on(void)
459 __ctl_clear_bit(0, 28);
460 S390_lowcore
.external_new_psw
.mask
|= PSW_MASK_DAT
;
461 S390_lowcore
.svc_new_psw
.mask
|= PSW_MASK_DAT
;
462 S390_lowcore
.program_new_psw
.mask
|= PSW_MASK_DAT
;
463 S390_lowcore
.io_new_psw
.mask
|= PSW_MASK_DAT
;
464 __ctl_set_bit(0, 28);
467 static struct resource code_resource
= {
468 .name
= "Kernel code",
469 .flags
= IORESOURCE_BUSY
| IORESOURCE_SYSTEM_RAM
,
472 static struct resource data_resource
= {
473 .name
= "Kernel data",
474 .flags
= IORESOURCE_BUSY
| IORESOURCE_SYSTEM_RAM
,
477 static struct resource bss_resource
= {
478 .name
= "Kernel bss",
479 .flags
= IORESOURCE_BUSY
| IORESOURCE_SYSTEM_RAM
,
482 static struct resource __initdata
*standard_resources
[] = {
488 static void __init
setup_resources(void)
490 struct resource
*res
, *std_res
, *sub_res
;
491 struct memblock_region
*reg
;
494 code_resource
.start
= (unsigned long) _text
;
495 code_resource
.end
= (unsigned long) _etext
- 1;
496 data_resource
.start
= (unsigned long) _etext
;
497 data_resource
.end
= (unsigned long) _edata
- 1;
498 bss_resource
.start
= (unsigned long) __bss_start
;
499 bss_resource
.end
= (unsigned long) __bss_stop
- 1;
501 for_each_memblock(memory
, reg
) {
502 res
= memblock_alloc(sizeof(*res
), 8);
504 panic("%s: Failed to allocate %zu bytes align=0x%x\n",
505 __func__
, sizeof(*res
), 8);
506 res
->flags
= IORESOURCE_BUSY
| IORESOURCE_SYSTEM_RAM
;
508 res
->name
= "System RAM";
509 res
->start
= reg
->base
;
510 res
->end
= reg
->base
+ reg
->size
- 1;
511 request_resource(&iomem_resource
, res
);
513 for (j
= 0; j
< ARRAY_SIZE(standard_resources
); j
++) {
514 std_res
= standard_resources
[j
];
515 if (std_res
->start
< res
->start
||
516 std_res
->start
> res
->end
)
518 if (std_res
->end
> res
->end
) {
519 sub_res
= memblock_alloc(sizeof(*sub_res
), 8);
521 panic("%s: Failed to allocate %zu bytes align=0x%x\n",
522 __func__
, sizeof(*sub_res
), 8);
524 sub_res
->end
= res
->end
;
525 std_res
->start
= res
->end
+ 1;
526 request_resource(res
, sub_res
);
528 request_resource(res
, std_res
);
532 #ifdef CONFIG_CRASH_DUMP
534 * Re-add removed crash kernel memory as reserved memory. This makes
535 * sure it will be mapped with the identity mapping and struct pages
536 * will be created, so it can be resized later on.
537 * However add it later since the crash kernel resource should not be
538 * part of the System RAM resource.
540 if (crashk_res
.end
) {
541 memblock_add_node(crashk_res
.start
, resource_size(&crashk_res
), 0);
542 memblock_reserve(crashk_res
.start
, resource_size(&crashk_res
));
543 insert_resource(&iomem_resource
, &crashk_res
);
548 static void __init
setup_memory_end(void)
550 unsigned long vmax
, tmp
;
552 /* Choose kernel address space layout: 3 or 4 levels. */
553 if (IS_ENABLED(CONFIG_KASAN
)) {
554 vmax
= IS_ENABLED(CONFIG_KASAN_S390_4_LEVEL_PAGING
)
558 tmp
= (memory_end
?: max_physmem_end
) / PAGE_SIZE
;
559 tmp
= tmp
* (sizeof(struct page
) + PAGE_SIZE
);
560 if (tmp
+ vmalloc_size
+ MODULES_LEN
<= _REGION2_SIZE
)
561 vmax
= _REGION2_SIZE
; /* 3-level kernel page table */
563 vmax
= _REGION1_SIZE
; /* 4-level kernel page table */
566 if (is_prot_virt_host())
567 adjust_to_uv_max(&vmax
);
569 /* module area is at the end of the kernel address space. */
571 MODULES_VADDR
= MODULES_END
- MODULES_LEN
;
572 VMALLOC_END
= MODULES_VADDR
;
573 VMALLOC_START
= VMALLOC_END
- vmalloc_size
;
575 /* Split remaining virtual space between 1:1 mapping & vmemmap array */
576 tmp
= VMALLOC_START
/ (PAGE_SIZE
+ sizeof(struct page
));
577 /* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */
578 tmp
= SECTION_ALIGN_UP(tmp
);
579 tmp
= VMALLOC_START
- tmp
* sizeof(struct page
);
580 tmp
&= ~((vmax
>> 11) - 1); /* align to page table level */
581 tmp
= min(tmp
, 1UL << MAX_PHYSMEM_BITS
);
582 vmemmap
= (struct page
*) tmp
;
584 /* Take care that memory_end is set and <= vmemmap */
585 memory_end
= min(memory_end
?: max_physmem_end
, (unsigned long)vmemmap
);
587 /* fit in kasan shadow memory region between 1:1 and vmemmap */
588 memory_end
= min(memory_end
, KASAN_SHADOW_START
);
589 vmemmap
= max(vmemmap
, (struct page
*)KASAN_SHADOW_END
);
591 max_pfn
= max_low_pfn
= PFN_DOWN(memory_end
);
592 memblock_remove(memory_end
, ULONG_MAX
);
594 pr_notice("The maximum memory size is %luMB\n", memory_end
>> 20);
597 #ifdef CONFIG_CRASH_DUMP
600 * When kdump is enabled, we have to ensure that no memory from
601 * the area [0 - crashkernel memory size] and
602 * [crashk_res.start - crashk_res.end] is set offline.
604 static int kdump_mem_notifier(struct notifier_block
*nb
,
605 unsigned long action
, void *data
)
607 struct memory_notify
*arg
= data
;
609 if (action
!= MEM_GOING_OFFLINE
)
611 if (arg
->start_pfn
< PFN_DOWN(resource_size(&crashk_res
)))
613 if (arg
->start_pfn
> PFN_DOWN(crashk_res
.end
))
615 if (arg
->start_pfn
+ arg
->nr_pages
- 1 < PFN_DOWN(crashk_res
.start
))
620 static struct notifier_block kdump_mem_nb
= {
621 .notifier_call
= kdump_mem_notifier
,
627 * Make sure that the area behind memory_end is protected
629 static void reserve_memory_end(void)
632 memblock_reserve(memory_end
, ULONG_MAX
);
636 * Make sure that oldmem, where the dump is stored, is protected
638 static void reserve_oldmem(void)
640 #ifdef CONFIG_CRASH_DUMP
642 /* Forget all memory above the running kdump system */
643 memblock_reserve(OLDMEM_SIZE
, (phys_addr_t
)ULONG_MAX
);
648 * Make sure that oldmem, where the dump is stored, is protected
650 static void remove_oldmem(void)
652 #ifdef CONFIG_CRASH_DUMP
654 /* Forget all memory above the running kdump system */
655 memblock_remove(OLDMEM_SIZE
, (phys_addr_t
)ULONG_MAX
);
660 * Reserve memory for kdump kernel to be loaded with kexec
662 static void __init
reserve_crashkernel(void)
664 #ifdef CONFIG_CRASH_DUMP
665 unsigned long long crash_base
, crash_size
;
666 phys_addr_t low
, high
;
669 rc
= parse_crashkernel(boot_command_line
, memory_end
, &crash_size
,
672 crash_base
= ALIGN(crash_base
, KEXEC_CRASH_MEM_ALIGN
);
673 crash_size
= ALIGN(crash_size
, KEXEC_CRASH_MEM_ALIGN
);
674 if (rc
|| crash_size
== 0)
677 if (memblock
.memory
.regions
[0].size
< crash_size
) {
678 pr_info("crashkernel reservation failed: %s\n",
679 "first memory chunk must be at least crashkernel size");
683 low
= crash_base
?: OLDMEM_BASE
;
684 high
= low
+ crash_size
;
685 if (low
>= OLDMEM_BASE
&& high
<= OLDMEM_BASE
+ OLDMEM_SIZE
) {
686 /* The crashkernel fits into OLDMEM, reuse OLDMEM */
689 /* Find suitable area in free memory */
690 low
= max_t(unsigned long, crash_size
, sclp
.hsa_size
);
691 high
= crash_base
? crash_base
+ crash_size
: ULONG_MAX
;
693 if (crash_base
&& crash_base
< low
) {
694 pr_info("crashkernel reservation failed: %s\n",
695 "crash_base too low");
698 low
= crash_base
?: low
;
699 crash_base
= memblock_find_in_range(low
, high
, crash_size
,
700 KEXEC_CRASH_MEM_ALIGN
);
704 pr_info("crashkernel reservation failed: %s\n",
705 "no suitable area found");
709 if (register_memory_notifier(&kdump_mem_nb
))
712 if (!OLDMEM_BASE
&& MACHINE_IS_VM
)
713 diag10_range(PFN_DOWN(crash_base
), PFN_DOWN(crash_size
));
714 crashk_res
.start
= crash_base
;
715 crashk_res
.end
= crash_base
+ crash_size
- 1;
716 memblock_remove(crash_base
, crash_size
);
717 pr_info("Reserving %lluMB of memory at %lluMB "
718 "for crashkernel (System RAM: %luMB)\n",
719 crash_size
>> 20, crash_base
>> 20,
720 (unsigned long)memblock
.memory
.total_size
>> 20);
721 os_info_crashkernel_add(crash_base
, crash_size
);
726 * Reserve the initrd from being used by memblock
728 static void __init
reserve_initrd(void)
730 #ifdef CONFIG_BLK_DEV_INITRD
731 if (!INITRD_START
|| !INITRD_SIZE
)
733 initrd_start
= INITRD_START
;
734 initrd_end
= initrd_start
+ INITRD_SIZE
;
735 memblock_reserve(INITRD_START
, INITRD_SIZE
);
740 * Reserve the memory area used to pass the certificate lists
742 static void __init
reserve_certificate_list(void)
744 if (ipl_cert_list_addr
)
745 memblock_reserve(ipl_cert_list_addr
, ipl_cert_list_size
);
748 static void __init
reserve_mem_detect_info(void)
750 unsigned long start
, size
;
752 get_mem_detect_reserved(&start
, &size
);
754 memblock_reserve(start
, size
);
757 static void __init
free_mem_detect_info(void)
759 unsigned long start
, size
;
761 get_mem_detect_reserved(&start
, &size
);
763 memblock_free(start
, size
);
766 static const char * __init
get_mem_info_source(void)
768 switch (mem_detect
.info_source
) {
769 case MEM_DETECT_SCLP_STOR_INFO
:
770 return "sclp storage info";
771 case MEM_DETECT_DIAG260
:
773 case MEM_DETECT_SCLP_READ_INFO
:
774 return "sclp read info";
775 case MEM_DETECT_BIN_SEARCH
:
776 return "binary search";
781 static void __init
memblock_add_mem_detect_info(void)
783 unsigned long start
, end
;
786 memblock_dbg("physmem info source: %s (%hhd)\n",
787 get_mem_info_source(), mem_detect
.info_source
);
788 /* keep memblock lists close to the kernel */
789 memblock_set_bottom_up(true);
790 for_each_mem_detect_block(i
, &start
, &end
) {
791 memblock_add(start
, end
- start
);
792 memblock_physmem_add(start
, end
- start
);
794 memblock_set_bottom_up(false);
795 memblock_set_node(0, ULONG_MAX
, &memblock
.memory
, 0);
800 * Check for initrd being in usable memory
802 static void __init
check_initrd(void)
804 #ifdef CONFIG_BLK_DEV_INITRD
805 if (INITRD_START
&& INITRD_SIZE
&&
806 !memblock_is_region_memory(INITRD_START
, INITRD_SIZE
)) {
807 pr_err("The initial RAM disk does not fit into the memory\n");
808 memblock_free(INITRD_START
, INITRD_SIZE
);
809 initrd_start
= initrd_end
= 0;
815 * Reserve memory used for lowcore/command line/kernel image.
817 static void __init
reserve_kernel(void)
819 unsigned long start_pfn
= PFN_UP(__pa(_end
));
821 memblock_reserve(0, HEAD_END
);
822 memblock_reserve((unsigned long)_stext
, PFN_PHYS(start_pfn
)
823 - (unsigned long)_stext
);
824 memblock_reserve(__sdma
, __edma
- __sdma
);
827 static void __init
setup_memory(void)
829 struct memblock_region
*reg
;
832 * Init storage key for present memory
834 for_each_memblock(memory
, reg
) {
835 storage_key_init_range(reg
->base
, reg
->base
+ reg
->size
);
837 psw_set_key(PAGE_DEFAULT_KEY
);
840 memblock_enforce_memory_limit(memblock_end_of_DRAM());
844 * Setup hardware capabilities.
846 static int __init
setup_hwcaps(void)
848 static const int stfl_bits
[6] = { 0, 2, 7, 17, 19, 21 };
853 * The store facility list bits numbers as found in the principles
854 * of operation are numbered with bit 1UL<<31 as number 0 to
855 * bit 1UL<<0 as number 31.
856 * Bit 0: instructions named N3, "backported" to esa-mode
857 * Bit 2: z/Architecture mode is active
858 * Bit 7: the store-facility-list-extended facility is installed
859 * Bit 17: the message-security assist is installed
860 * Bit 19: the long-displacement facility is installed
861 * Bit 21: the extended-immediate facility is installed
862 * Bit 22: extended-translation facility 3 is installed
863 * Bit 30: extended-translation facility 3 enhancement facility
864 * These get translated to:
865 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
866 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
867 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
868 * HWCAP_S390_ETF3EH bit 8 (22 && 30).
870 for (i
= 0; i
< 6; i
++)
871 if (test_facility(stfl_bits
[i
]))
872 elf_hwcap
|= 1UL << i
;
874 if (test_facility(22) && test_facility(30))
875 elf_hwcap
|= HWCAP_S390_ETF3EH
;
878 * Check for additional facilities with store-facility-list-extended.
879 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
880 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
881 * as stored by stfl, bits 32-xxx contain additional facilities.
882 * How many facility words are stored depends on the number of
883 * doublewords passed to the instruction. The additional facilities
885 * Bit 42: decimal floating point facility is installed
886 * Bit 44: perform floating point operation facility is installed
888 * HWCAP_S390_DFP bit 6 (42 && 44).
890 if ((elf_hwcap
& (1UL << 2)) && test_facility(42) && test_facility(44))
891 elf_hwcap
|= HWCAP_S390_DFP
;
894 * Huge page support HWCAP_S390_HPAGE is bit 7.
896 if (MACHINE_HAS_EDAT1
)
897 elf_hwcap
|= HWCAP_S390_HPAGE
;
900 * 64-bit register support for 31-bit processes
901 * HWCAP_S390_HIGH_GPRS is bit 9.
903 elf_hwcap
|= HWCAP_S390_HIGH_GPRS
;
906 * Transactional execution support HWCAP_S390_TE is bit 10.
909 elf_hwcap
|= HWCAP_S390_TE
;
912 * Vector extension HWCAP_S390_VXRS is bit 11. The Vector extension
913 * can be disabled with the "novx" parameter. Use MACHINE_HAS_VX
914 * instead of facility bit 129.
916 if (MACHINE_HAS_VX
) {
917 elf_hwcap
|= HWCAP_S390_VXRS
;
918 if (test_facility(134))
919 elf_hwcap
|= HWCAP_S390_VXRS_EXT
;
920 if (test_facility(135))
921 elf_hwcap
|= HWCAP_S390_VXRS_BCD
;
922 if (test_facility(148))
923 elf_hwcap
|= HWCAP_S390_VXRS_EXT2
;
924 if (test_facility(152))
925 elf_hwcap
|= HWCAP_S390_VXRS_PDE
;
927 if (test_facility(150))
928 elf_hwcap
|= HWCAP_S390_SORT
;
929 if (test_facility(151))
930 elf_hwcap
|= HWCAP_S390_DFLT
;
933 * Guarded storage support HWCAP_S390_GS is bit 12.
936 elf_hwcap
|= HWCAP_S390_GS
;
939 add_device_randomness(&cpu_id
, sizeof(cpu_id
));
940 switch (cpu_id
.machine
) {
943 default: /* Use "z900" as default for 64 bit kernels. */
944 strcpy(elf_platform
, "z900");
948 strcpy(elf_platform
, "z990");
952 strcpy(elf_platform
, "z9-109");
956 strcpy(elf_platform
, "z10");
960 strcpy(elf_platform
, "z196");
964 strcpy(elf_platform
, "zEC12");
968 strcpy(elf_platform
, "z13");
972 strcpy(elf_platform
, "z14");
976 strcpy(elf_platform
, "z15");
981 * Virtualization support HWCAP_INT_SIE is bit 0.
984 int_hwcap
|= HWCAP_INT_SIE
;
988 arch_initcall(setup_hwcaps
);
991 * Add system information as device randomness
993 static void __init
setup_randomness(void)
995 struct sysinfo_3_2_2
*vmms
;
997 vmms
= (struct sysinfo_3_2_2
*) memblock_phys_alloc(PAGE_SIZE
,
1000 panic("Failed to allocate memory for sysinfo structure\n");
1002 if (stsi(vmms
, 3, 2, 2) == 0 && vmms
->count
)
1003 add_device_randomness(&vmms
->vm
, sizeof(vmms
->vm
[0]) * vmms
->count
);
1004 memblock_free((unsigned long) vmms
, PAGE_SIZE
);
1008 * Find the correct size for the task_struct. This depends on
1009 * the size of the struct fpu at the end of the thread_struct
1010 * which is embedded in the task_struct.
1012 static void __init
setup_task_size(void)
1014 int task_size
= sizeof(struct task_struct
);
1016 if (!MACHINE_HAS_VX
) {
1017 task_size
-= sizeof(__vector128
) * __NUM_VXRS
;
1018 task_size
+= sizeof(freg_t
) * __NUM_FPRS
;
1020 arch_task_struct_size
= task_size
;
1024 * Issue diagnose 318 to set the control program name and
1027 static void __init
setup_control_program_code(void)
1029 union diag318_info diag318_info
= {
1035 if (!sclp
.has_diag318
)
1038 diag_stat_inc(DIAG_STAT_X318
);
1039 asm volatile("diag %0,0,0x318\n" : : "d" (diag318_info
.val
));
1043 * Print the component list from the IPL report
1045 static void __init
log_component_list(void)
1047 struct ipl_rb_component_entry
*ptr
, *end
;
1050 if (!early_ipl_comp_list_addr
)
1052 if (ipl_block
.hdr
.flags
& IPL_PL_FLAG_SIPL
)
1053 pr_info("Linux is running with Secure-IPL enabled\n");
1055 pr_info("Linux is running with Secure-IPL disabled\n");
1056 ptr
= (void *) early_ipl_comp_list_addr
;
1057 end
= (void *) ptr
+ early_ipl_comp_list_size
;
1058 pr_info("The IPL report contains the following components:\n");
1060 if (ptr
->flags
& IPL_RB_COMPONENT_FLAG_SIGNED
) {
1061 if (ptr
->flags
& IPL_RB_COMPONENT_FLAG_VERIFIED
)
1062 str
= "signed, verified";
1064 str
= "signed, verification failed";
1068 pr_info("%016llx - %016llx (%s)\n",
1069 ptr
->addr
, ptr
->addr
+ ptr
->len
, str
);
1075 * Setup function called from init/main.c just after the banner
1079 void __init
setup_arch(char **cmdline_p
)
1082 * print what head.S has found out about the machine
1085 pr_info("Linux is running as a z/VM "
1086 "guest operating system in 64-bit mode\n");
1087 else if (MACHINE_IS_KVM
)
1088 pr_info("Linux is running under KVM in 64-bit mode\n");
1089 else if (MACHINE_IS_LPAR
)
1090 pr_info("Linux is running natively in 64-bit mode\n");
1092 pr_info("Linux is running as a guest in 64-bit mode\n");
1094 log_component_list();
1096 /* Have one command line that is parsed and saved in /proc/cmdline */
1097 /* boot_command_line has been already set up in early.c */
1098 *cmdline_p
= boot_command_line
;
1100 ROOT_DEV
= Root_RAM0
;
1102 init_mm
.start_code
= (unsigned long) _text
;
1103 init_mm
.end_code
= (unsigned long) _etext
;
1104 init_mm
.end_data
= (unsigned long) _edata
;
1105 init_mm
.brk
= (unsigned long) _end
;
1107 if (IS_ENABLED(CONFIG_EXPOLINE_AUTO
))
1108 nospec_auto_detect();
1110 parse_early_param();
1111 #ifdef CONFIG_CRASH_DUMP
1112 /* Deactivate elfcorehdr= kernel parameter */
1113 elfcorehdr_addr
= ELFCORE_ADDR_MAX
;
1119 setup_control_program_code();
1121 /* Do some memory reservations *before* memory is added to memblock */
1122 reserve_memory_end();
1126 reserve_certificate_list();
1127 reserve_mem_detect_info();
1128 memblock_allow_resize();
1130 /* Get information about *all* installed memory */
1131 memblock_add_mem_detect_info();
1133 free_mem_detect_info();
1137 * Make sure all chunks are MAX_ORDER aligned so we don't need the
1138 * extra checks that HOLES_IN_ZONE would require.
1140 * Is this still required?
1142 memblock_trim_memory(1UL << (MAX_ORDER
- 1 + PAGE_SHIFT
));
1144 if (is_prot_virt_host())
1148 dma_contiguous_reserve(memory_end
);
1152 reserve_crashkernel();
1153 #ifdef CONFIG_CRASH_DUMP
1155 * Be aware that smp_save_dump_cpus() triggers a system reset.
1156 * Therefore CPU and device initialization should be done afterwards.
1158 smp_save_dump_cpus();
1162 setup_lowcore_dat_off();
1163 smp_fill_possible_mask();
1164 cpu_detect_mhz_feature();
1168 topology_init_early();
1171 * Create kernel page tables and switch to virtual addressing.
1176 * After paging_init created the kernel page table, the new PSWs
1177 * in lowcore can now run with DAT enabled.
1179 setup_lowcore_dat_on();
1181 /* Setup default console */
1183 set_preferred_console();
1185 apply_alternative_instructions();
1186 if (IS_ENABLED(CONFIG_EXPOLINE
))
1187 nospec_init_branches();
1189 /* Setup zfcpdump support */
1192 /* Add system specific data to the random pool */