2 * arch/s390/kernel/setup.c
5 * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
6 * Author(s): Hartmut Penner (hp@de.ibm.com),
7 * Martin Schwidefsky (schwidefsky@de.ibm.com)
9 * Derived from "arch/i386/kernel/setup.c"
10 * Copyright (C) 1995, Linus Torvalds
14 * This file handles the architecture-dependent parts of initialization
17 #include <linux/errno.h>
18 #include <linux/module.h>
19 #include <linux/sched.h>
20 #include <linux/kernel.h>
22 #include <linux/stddef.h>
23 #include <linux/unistd.h>
24 #include <linux/ptrace.h>
25 #include <linux/slab.h>
26 #include <linux/user.h>
27 #include <linux/a.out.h>
28 #include <linux/tty.h>
29 #include <linux/ioport.h>
30 #include <linux/delay.h>
31 #include <linux/config.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/seq_file.h>
38 #include <linux/kernel_stat.h>
40 #include <asm/uaccess.h>
41 #include <asm/system.h>
43 #include <asm/mmu_context.h>
44 #include <asm/cpcmd.h>
45 #include <asm/lowcore.h>
51 unsigned int console_mode
= 0;
52 unsigned int console_devno
= -1;
53 unsigned int console_irq
= -1;
54 unsigned long memory_size
= 0;
55 unsigned long machine_flags
= 0;
56 unsigned int default_storage_key
= 0;
58 unsigned long addr
, size
, type
;
59 } memory_chunk
[MEMORY_CHUNKS
] = { { 0 } };
60 #define CHUNK_READ_WRITE 0
61 #define CHUNK_READ_ONLY 1
62 volatile int __cpu_logical_map
[NR_CPUS
]; /* logical cpu to cpu address */
67 extern int _text
,_etext
, _edata
, _end
;
70 * This is set up by the setup-routine at boot-time
71 * for S390 need to find out, what we have to setup
72 * using address 0x10400 ...
75 #include <asm/setup.h>
77 static char command_line
[COMMAND_LINE_SIZE
] = { 0, };
79 static struct resource code_resource
= {
80 .name
= "Kernel code",
81 .flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
,
84 static struct resource data_resource
= {
85 .name
= "Kernel data",
86 .flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
,
90 * cpu_init() initializes state that is per-CPU.
92 void __devinit
cpu_init (void)
94 int addr
= hard_smp_processor_id();
97 * Store processor id in lowcore (used e.g. in timer_interrupt)
99 asm volatile ("stidp %0": "=m" (S390_lowcore
.cpu_data
.cpu_id
));
100 S390_lowcore
.cpu_data
.cpu_addr
= addr
;
103 * Force FPU initialization:
105 clear_thread_flag(TIF_USEDFPU
);
108 atomic_inc(&init_mm
.mm_count
);
109 current
->active_mm
= &init_mm
;
112 enter_lazy_tlb(&init_mm
, current
);
116 * VM halt and poweroff setup routines
118 char vmhalt_cmd
[128] = "";
119 char vmpoff_cmd
[128] = "";
121 static inline void strncpy_skip_quote(char *dst
, char *src
, int n
)
126 for (sx
= 0; src
[sx
] != 0; sx
++) {
127 if (src
[sx
] == '"') continue;
133 static int __init
vmhalt_setup(char *str
)
135 strncpy_skip_quote(vmhalt_cmd
, str
, 127);
140 __setup("vmhalt=", vmhalt_setup
);
142 static int __init
vmpoff_setup(char *str
)
144 strncpy_skip_quote(vmpoff_cmd
, str
, 127);
149 __setup("vmpoff=", vmpoff_setup
);
152 * condev= and conmode= setup parameter.
155 static int __init
condev_setup(char *str
)
159 vdev
= simple_strtoul(str
, &str
, 0);
160 if (vdev
>= 0 && vdev
< 65536) {
161 console_devno
= vdev
;
167 __setup("condev=", condev_setup
);
169 static int __init
conmode_setup(char *str
)
171 #if defined(CONFIG_SCLP_CONSOLE)
172 if (strncmp(str
, "hwc", 4) == 0 || strncmp(str
, "sclp", 5) == 0)
175 #if defined(CONFIG_TN3215_CONSOLE)
176 if (strncmp(str
, "3215", 5) == 0)
179 #if defined(CONFIG_TN3270_CONSOLE)
180 if (strncmp(str
, "3270", 5) == 0)
186 __setup("conmode=", conmode_setup
);
188 static void __init
conmode_default(void)
190 char query_buffer
[1024];
194 __cpcmd("QUERY CONSOLE", query_buffer
, 1024);
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);
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);
209 #if defined(CONFIG_SCLP_CONSOLE)
214 if (strncmp(ptr
+ 8, "3270", 4) == 0) {
215 #if defined(CONFIG_TN3270_CONSOLE)
217 #elif defined(CONFIG_TN3215_CONSOLE)
219 #elif defined(CONFIG_SCLP_CONSOLE)
222 } else if (strncmp(ptr
+ 8, "3215", 4) == 0) {
223 #if defined(CONFIG_TN3215_CONSOLE)
225 #elif defined(CONFIG_TN3270_CONSOLE)
227 #elif defined(CONFIG_SCLP_CONSOLE)
231 } else if (MACHINE_IS_P390
) {
232 #if defined(CONFIG_TN3215_CONSOLE)
234 #elif defined(CONFIG_TN3270_CONSOLE)
238 #if defined(CONFIG_SCLP_CONSOLE)
245 extern void machine_restart_smp(char *);
246 extern void machine_halt_smp(void);
247 extern void machine_power_off_smp(void);
249 void (*_machine_restart
)(char *command
) = machine_restart_smp
;
250 void (*_machine_halt
)(void) = machine_halt_smp
;
251 void (*_machine_power_off
)(void) = machine_power_off_smp
;
254 * Reboot, halt and power_off routines for non SMP.
256 extern void reipl(unsigned long devno
);
257 static void do_machine_restart_nonsmp(char * __unused
)
260 cpcmd ("IPL", NULL
, 0);
262 reipl (0x10000 | S390_lowcore
.ipl_device
);
265 static void do_machine_halt_nonsmp(void)
267 if (MACHINE_IS_VM
&& strlen(vmhalt_cmd
) > 0)
268 cpcmd(vmhalt_cmd
, NULL
, 0);
269 signal_processor(smp_processor_id(), sigp_stop_and_store_status
);
272 static void do_machine_power_off_nonsmp(void)
274 if (MACHINE_IS_VM
&& strlen(vmpoff_cmd
) > 0)
275 cpcmd(vmpoff_cmd
, NULL
, 0);
276 signal_processor(smp_processor_id(), sigp_stop_and_store_status
);
279 void (*_machine_restart
)(char *command
) = do_machine_restart_nonsmp
;
280 void (*_machine_halt
)(void) = do_machine_halt_nonsmp
;
281 void (*_machine_power_off
)(void) = do_machine_power_off_nonsmp
;
285 * Reboot, halt and power_off stubs. They just call _machine_restart,
286 * _machine_halt or _machine_power_off.
289 void machine_restart(char *command
)
292 _machine_restart(command
);
295 EXPORT_SYMBOL(machine_restart
);
297 void machine_halt(void)
303 EXPORT_SYMBOL(machine_halt
);
305 void machine_power_off(void)
308 _machine_power_off();
311 EXPORT_SYMBOL(machine_power_off
);
314 * Setup function called from init/main.c just after the banner
317 extern char _pstart
, _pend
, _stext
;
319 void __init
setup_arch(char **cmdline_p
)
321 unsigned long bootmap_size
;
322 unsigned long memory_start
, memory_end
;
323 char c
= ' ', cn
, *to
= command_line
, *from
= COMMAND_LINE
;
324 unsigned long start_pfn
, end_pfn
;
325 static unsigned int smptrap
=0;
326 unsigned long delay
= 0;
335 * print what head.S has found out about the machine
337 #ifndef CONFIG_ARCH_S390X
338 printk((MACHINE_IS_VM
) ?
339 "We are running under VM (31 bit mode)\n" :
340 "We are running native (31 bit mode)\n");
341 printk((MACHINE_HAS_IEEE
) ?
342 "This machine has an IEEE fpu\n" :
343 "This machine has no IEEE fpu\n");
344 #else /* CONFIG_ARCH_S390X */
345 printk((MACHINE_IS_VM
) ?
346 "We are running under VM (64 bit mode)\n" :
347 "We are running native (64 bit mode)\n");
348 #endif /* CONFIG_ARCH_S390X */
350 ROOT_DEV
= Root_RAM0
;
351 memory_start
= (unsigned long) &_end
; /* fixit if use $CODELO etc*/
352 #ifndef CONFIG_ARCH_S390X
353 memory_end
= memory_size
& ~0x400000UL
; /* align memory end to 4MB */
355 * We need some free virtual space to be able to do vmalloc.
356 * On a machine with 2GB memory we make sure that we have at
357 * least 128 MB free space for vmalloc.
359 if (memory_end
> 1920*1024*1024)
360 memory_end
= 1920*1024*1024;
361 #else /* CONFIG_ARCH_S390X */
362 memory_end
= memory_size
& ~0x200000UL
; /* detected in head.s */
363 #endif /* CONFIG_ARCH_S390X */
364 init_mm
.start_code
= PAGE_OFFSET
;
365 init_mm
.end_code
= (unsigned long) &_etext
;
366 init_mm
.end_data
= (unsigned long) &_edata
;
367 init_mm
.brk
= (unsigned long) &_end
;
369 code_resource
.start
= (unsigned long) &_text
;
370 code_resource
.end
= (unsigned long) &_etext
- 1;
371 data_resource
.start
= (unsigned long) &_etext
;
372 data_resource
.end
= (unsigned long) &_edata
- 1;
374 /* Save unparsed command line copy for /proc/cmdline */
375 memcpy(saved_command_line
, COMMAND_LINE
, COMMAND_LINE_SIZE
);
376 saved_command_line
[COMMAND_LINE_SIZE
-1] = '\0';
380 * "mem=XXX[kKmM]" sets memsize
382 if (c
== ' ' && strncmp(from
, "mem=", 4) == 0) {
383 memory_end
= simple_strtoul(from
+4, &from
, 0);
384 if ( *from
== 'K' || *from
== 'k' ) {
385 memory_end
= memory_end
<< 10;
387 } else if ( *from
== 'M' || *from
== 'm' ) {
388 memory_end
= memory_end
<< 20;
393 * "ipldelay=XXX[sm]" sets ipl delay in seconds or minutes
395 if (c
== ' ' && strncmp(from
, "ipldelay=", 9) == 0) {
396 delay
= simple_strtoul(from
+9, &from
, 0);
397 if (*from
== 's' || *from
== 'S') {
398 delay
= delay
*1000000;
400 } else if (*from
== 'm' || *from
== 'M') {
401 delay
= delay
*60*1000000;
404 /* now wait for the requested amount of time */
411 cn
= ' '; /* replace newlines with space */
413 cn
= ' '; /* replace 0x0d with space */
414 if (cn
== ' ' && c
== ' ')
415 continue; /* remove additional spaces */
417 if (to
- command_line
>= COMMAND_LINE_SIZE
)
421 if (c
== ' ' && to
> command_line
) to
--;
423 *cmdline_p
= command_line
;
426 * partially used pages are not usable - thus
427 * we are rounding upwards:
429 start_pfn
= (__pa(&_end
) + PAGE_SIZE
- 1) >> PAGE_SHIFT
;
430 end_pfn
= max_pfn
= memory_end
>> PAGE_SHIFT
;
433 * Initialize the boot-time allocator (with low memory only):
435 bootmap_size
= init_bootmem(start_pfn
, end_pfn
);
438 * Register RAM areas with the bootmem allocator.
440 for (i
= 0; i
< 16 && memory_chunk
[i
].size
> 0; i
++) {
441 unsigned long start_chunk
, end_chunk
;
443 if (memory_chunk
[i
].type
!= CHUNK_READ_WRITE
)
445 start_chunk
= (memory_chunk
[i
].addr
+ PAGE_SIZE
- 1);
446 start_chunk
>>= PAGE_SHIFT
;
447 end_chunk
= (memory_chunk
[i
].addr
+ memory_chunk
[i
].size
);
448 end_chunk
>>= PAGE_SHIFT
;
449 if (start_chunk
< start_pfn
)
450 start_chunk
= start_pfn
;
451 if (end_chunk
> end_pfn
)
453 if (start_chunk
< end_chunk
)
454 free_bootmem(start_chunk
<< PAGE_SHIFT
,
455 (end_chunk
- start_chunk
) << PAGE_SHIFT
);
459 * Reserve the bootmem bitmap itself as well. We do this in two
460 * steps (first step was init_bootmem()) because this catches
461 * the (very unlikely) case of us accidentally initializing the
462 * bootmem allocator with an invalid RAM area.
464 reserve_bootmem(start_pfn
<< PAGE_SHIFT
, bootmap_size
);
466 #ifdef CONFIG_BLK_DEV_INITRD
468 if (INITRD_START
+ INITRD_SIZE
<= memory_end
) {
469 reserve_bootmem(INITRD_START
, INITRD_SIZE
);
470 initrd_start
= INITRD_START
;
471 initrd_end
= initrd_start
+ INITRD_SIZE
;
473 printk("initrd extends beyond end of memory "
474 "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
475 initrd_start
+ INITRD_SIZE
, memory_end
);
476 initrd_start
= initrd_end
= 0;
481 for (i
= 0; i
< 16 && memory_chunk
[i
].size
> 0; i
++) {
482 struct resource
*res
;
484 res
= alloc_bootmem_low(sizeof(struct resource
));
485 res
->flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
;
487 switch (memory_chunk
[i
].type
) {
488 case CHUNK_READ_WRITE
:
489 res
->name
= "System RAM";
491 case CHUNK_READ_ONLY
:
492 res
->name
= "System ROM";
493 res
->flags
|= IORESOURCE_READONLY
;
496 res
->name
= "reserved";
498 res
->start
= memory_chunk
[i
].addr
;
499 res
->end
= memory_chunk
[i
].addr
+ memory_chunk
[i
].size
- 1;
500 request_resource(&iomem_resource
, res
);
501 request_resource(res
, &code_resource
);
502 request_resource(res
, &data_resource
);
506 * Setup lowcore for boot cpu
508 #ifndef CONFIG_ARCH_S390X
509 lc
= (struct _lowcore
*) __alloc_bootmem(PAGE_SIZE
, PAGE_SIZE
, 0);
510 memset(lc
, 0, PAGE_SIZE
);
511 #else /* CONFIG_ARCH_S390X */
512 lc
= (struct _lowcore
*) __alloc_bootmem(2*PAGE_SIZE
, 2*PAGE_SIZE
, 0);
513 memset(lc
, 0, 2*PAGE_SIZE
);
514 #endif /* CONFIG_ARCH_S390X */
515 lc
->restart_psw
.mask
= PSW_BASE_BITS
;
516 lc
->restart_psw
.addr
=
517 PSW_ADDR_AMODE
| (unsigned long) restart_int_handler
;
518 lc
->external_new_psw
.mask
= PSW_KERNEL_BITS
;
519 lc
->external_new_psw
.addr
=
520 PSW_ADDR_AMODE
| (unsigned long) ext_int_handler
;
521 lc
->svc_new_psw
.mask
= PSW_KERNEL_BITS
| PSW_MASK_IO
| PSW_MASK_EXT
;
522 lc
->svc_new_psw
.addr
= PSW_ADDR_AMODE
| (unsigned long) system_call
;
523 lc
->program_new_psw
.mask
= PSW_KERNEL_BITS
;
524 lc
->program_new_psw
.addr
=
525 PSW_ADDR_AMODE
| (unsigned long)pgm_check_handler
;
526 lc
->mcck_new_psw
.mask
= PSW_KERNEL_BITS
;
527 lc
->mcck_new_psw
.addr
=
528 PSW_ADDR_AMODE
| (unsigned long) mcck_int_handler
;
529 lc
->io_new_psw
.mask
= PSW_KERNEL_BITS
;
530 lc
->io_new_psw
.addr
= PSW_ADDR_AMODE
| (unsigned long) io_int_handler
;
531 lc
->ipl_device
= S390_lowcore
.ipl_device
;
532 lc
->jiffy_timer
= -1LL;
533 lc
->kernel_stack
= ((unsigned long) &init_thread_union
) + THREAD_SIZE
;
534 lc
->async_stack
= (unsigned long)
535 __alloc_bootmem(ASYNC_SIZE
, ASYNC_SIZE
, 0) + ASYNC_SIZE
;
536 #ifdef CONFIG_CHECK_STACK
537 lc
->panic_stack
= (unsigned long)
538 __alloc_bootmem(PAGE_SIZE
, PAGE_SIZE
, 0) + PAGE_SIZE
;
540 lc
->current_task
= (unsigned long) init_thread_union
.thread_info
.task
;
541 lc
->thread_info
= (unsigned long) &init_thread_union
;
542 #ifdef CONFIG_ARCH_S390X
543 if (MACHINE_HAS_DIAG44
)
544 lc
->diag44_opcode
= 0x83000044;
546 lc
->diag44_opcode
= 0x07000700;
547 #endif /* CONFIG_ARCH_S390X */
548 set_prefix((u32
)(unsigned long) lc
);
550 __cpu_logical_map
[0] = S390_lowcore
.cpu_data
.cpu_addr
;
553 * Create kernel page tables and switch to virtual addressing.
557 /* Setup default console */
561 void print_cpu_info(struct cpuinfo_S390
*cpuinfo
)
567 "vers=%02X ident=%06X machine=%04X unused=%04X\n",
572 cpuinfo
->cpu_id
.version
,
573 cpuinfo
->cpu_id
.ident
,
574 cpuinfo
->cpu_id
.machine
,
575 cpuinfo
->cpu_id
.unused
);
579 * show_cpuinfo - Get information on one CPU for use by procfs.
582 static int show_cpuinfo(struct seq_file
*m
, void *v
)
584 struct cpuinfo_S390
*cpuinfo
;
585 unsigned long n
= (unsigned long) v
- 1;
588 seq_printf(m
, "vendor_id : IBM/S390\n"
589 "# processors : %i\n"
590 "bogomips per cpu: %lu.%02lu\n",
591 num_online_cpus(), loops_per_jiffy
/(500000/HZ
),
592 (loops_per_jiffy
/(5000/HZ
))%100);
596 if (smp_processor_id() == n
)
597 cpuinfo
= &S390_lowcore
.cpu_data
;
599 cpuinfo
= &lowcore_ptr
[n
]->cpu_data
;
601 cpuinfo
= &S390_lowcore
.cpu_data
;
603 seq_printf(m
, "processor %li: "
605 "identification = %06X, "
607 n
, cpuinfo
->cpu_id
.version
,
608 cpuinfo
->cpu_id
.ident
,
609 cpuinfo
->cpu_id
.machine
);
614 static void *c_start(struct seq_file
*m
, loff_t
*pos
)
616 return *pos
< NR_CPUS
? (void *)((unsigned long) *pos
+ 1) : NULL
;
618 static void *c_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
621 return c_start(m
, pos
);
623 static void c_stop(struct seq_file
*m
, void *v
)
626 struct seq_operations cpuinfo_op
= {
630 .show
= show_cpuinfo
,