summaryrefslogtreecommitdiff
path: root/arch/s390/kernel/setup.c
blob: c879c40aa7a57fd1930a742e5e27fe7a7ee040c5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
/*
 *  arch/s390/kernel/setup.c
 *
 *  S390 version
 *    Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
 *    Author(s): Hartmut Penner (hp@de.ibm.com),
 *               Martin Schwidefsky (schwidefsky@de.ibm.com)
 *
 *  Derived from "arch/i386/kernel/setup.c"
 *    Copyright (C) 1995, Linus Torvalds
 */

/*
 * This file handles the architecture-dependent parts of initialization
 */

#include <linux/errno.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/stddef.h>
#include <linux/unistd.h>
#include <linux/ptrace.h>
#include <linux/slab.h>
#include <linux/user.h>
#include <linux/a.out.h>
#include <linux/tty.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/config.h>
#include <linux/init.h>
#include <linux/initrd.h>
#include <linux/bootmem.h>
#include <linux/root_dev.h>
#include <linux/console.h>
#include <linux/seq_file.h>
#include <linux/kernel_stat.h>

#include <asm/uaccess.h>
#include <asm/system.h>
#include <asm/smp.h>
#include <asm/mmu_context.h>
#include <asm/cpcmd.h>
#include <asm/lowcore.h>
#include <asm/irq.h>

/*
 * Machine setup..
 */
unsigned int console_mode = 0;
unsigned int console_devno = -1;
unsigned int console_irq = -1;
unsigned long memory_size = 0;
unsigned long machine_flags = 0;
unsigned int default_storage_key = 0;
struct {
	unsigned long addr, size, type;
} memory_chunk[MEMORY_CHUNKS] = { { 0 } };
#define CHUNK_READ_WRITE 0
#define CHUNK_READ_ONLY 1
volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */

/*
 * Setup options
 */
extern int _text,_etext, _edata, _end;

/*
 * This is set up by the setup-routine at boot-time
 * for S390 need to find out, what we have to setup
 * using address 0x10400 ...
 */

#include <asm/setup.h>

static char command_line[COMMAND_LINE_SIZE] = { 0, };

static struct resource code_resource = {
	.name  = "Kernel code",
	.flags = IORESOURCE_BUSY | IORESOURCE_MEM,
};

static struct resource data_resource = {
	.name = "Kernel data",
	.flags = IORESOURCE_BUSY | IORESOURCE_MEM,
};

/*
 * cpu_init() initializes state that is per-CPU.
 */
void __devinit cpu_init (void)
{
        int addr = hard_smp_processor_id();

        /*
         * Store processor id in lowcore (used e.g. in timer_interrupt)
         */
        asm volatile ("stidp %0": "=m" (S390_lowcore.cpu_data.cpu_id));
        S390_lowcore.cpu_data.cpu_addr = addr;

        /*
         * Force FPU initialization:
         */
        clear_thread_flag(TIF_USEDFPU);
        clear_used_math();

	atomic_inc(&init_mm.mm_count);
	current->active_mm = &init_mm;
        if (current->mm)
                BUG();
        enter_lazy_tlb(&init_mm, current);
}

/*
 * VM halt and poweroff setup routines
 */
char vmhalt_cmd[128] = "";
char vmpoff_cmd[128] = "";

static inline void strncpy_skip_quote(char *dst, char *src, int n)
{
        int sx, dx;

        dx = 0;
        for (sx = 0; src[sx] != 0; sx++) {
                if (src[sx] == '"') continue;
                dst[dx++] = src[sx];
                if (dx >= n) break;
        }
}

static int __init vmhalt_setup(char *str)
{
        strncpy_skip_quote(vmhalt_cmd, str, 127);
        vmhalt_cmd[127] = 0;
        return 1;
}

__setup("vmhalt=", vmhalt_setup);

static int __init vmpoff_setup(char *str)
{
        strncpy_skip_quote(vmpoff_cmd, str, 127);
        vmpoff_cmd[127] = 0;
        return 1;
}

__setup("vmpoff=", vmpoff_setup);

/*
 * condev= and conmode= setup parameter.
 */

static int __init condev_setup(char *str)
{
	int vdev;

	vdev = simple_strtoul(str, &str, 0);
	if (vdev >= 0 && vdev < 65536) {
		console_devno = vdev;
		console_irq = -1;
	}
	return 1;
}

__setup("condev=", condev_setup);

static int __init conmode_setup(char *str)
{
#if defined(CONFIG_SCLP_CONSOLE)
	if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
                SET_CONSOLE_SCLP;
#endif
#if defined(CONFIG_TN3215_CONSOLE)
	if (strncmp(str, "3215", 5) == 0)
		SET_CONSOLE_3215;
#endif
#if defined(CONFIG_TN3270_CONSOLE)
	if (strncmp(str, "3270", 5) == 0)
		SET_CONSOLE_3270;
#endif
        return 1;
}

__setup("conmode=", conmode_setup);

static void __init conmode_default(void)
{
	char query_buffer[1024];
	char *ptr;

        if (MACHINE_IS_VM) {
		__cpcmd("QUERY CONSOLE", query_buffer, 1024);
		console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
		ptr = strstr(query_buffer, "SUBCHANNEL =");
		console_irq = simple_strtoul(ptr + 13, NULL, 16);
		__cpcmd("QUERY TERM", query_buffer, 1024);
		ptr = strstr(query_buffer, "CONMODE");
		/*
		 * Set the conmode to 3215 so that the device recognition 
		 * will set the cu_type of the console to 3215. If the
		 * conmode is 3270 and we don't set it back then both
		 * 3215 and the 3270 driver will try to access the console
		 * device (3215 as console and 3270 as normal tty).
		 */
		__cpcmd("TERM CONMODE 3215", NULL, 0);
		if (ptr == NULL) {
#if defined(CONFIG_SCLP_CONSOLE)
			SET_CONSOLE_SCLP;
#endif
			return;
		}
		if (strncmp(ptr + 8, "3270", 4) == 0) {
#if defined(CONFIG_TN3270_CONSOLE)
			SET_CONSOLE_3270;
#elif defined(CONFIG_TN3215_CONSOLE)
			SET_CONSOLE_3215;
#elif defined(CONFIG_SCLP_CONSOLE)
			SET_CONSOLE_SCLP;
#endif
		} else if (strncmp(ptr + 8, "3215", 4) == 0) {
#if defined(CONFIG_TN3215_CONSOLE)
			SET_CONSOLE_3215;
#elif defined(CONFIG_TN3270_CONSOLE)
			SET_CONSOLE_3270;
#elif defined(CONFIG_SCLP_CONSOLE)
			SET_CONSOLE_SCLP;
#endif
		}
        } else if (MACHINE_IS_P390) {
#if defined(CONFIG_TN3215_CONSOLE)
		SET_CONSOLE_3215;
#elif defined(CONFIG_TN3270_CONSOLE)
		SET_CONSOLE_3270;
#endif
	} else {
#if defined(CONFIG_SCLP_CONSOLE)
		SET_CONSOLE_SCLP;
#endif
	}
}

#ifdef CONFIG_SMP
extern void machine_restart_smp(char *);
extern void machine_halt_smp(void);
extern void machine_power_off_smp(void);

void (*_machine_restart)(char *command) = machine_restart_smp;
void (*_machine_halt)(void) = machine_halt_smp;
void (*_machine_power_off)(void) = machine_power_off_smp;
#else
/*
 * Reboot, halt and power_off routines for non SMP.
 */
extern void reipl(unsigned long devno);
static void do_machine_restart_nonsmp(char * __unused)
{
	if (MACHINE_IS_VM)
		cpcmd ("IPL", NULL, 0);
	else
		reipl (0x10000 | S390_lowcore.ipl_device);
}

static void do_machine_halt_nonsmp(void)
{
        if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0)
                cpcmd(vmhalt_cmd, NULL, 0);
        signal_processor(smp_processor_id(), sigp_stop_and_store_status);
}

static void do_machine_power_off_nonsmp(void)
{
        if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0)
                cpcmd(vmpoff_cmd, NULL, 0);
        signal_processor(smp_processor_id(), sigp_stop_and_store_status);
}

void (*_machine_restart)(char *command) = do_machine_restart_nonsmp;
void (*_machine_halt)(void) = do_machine_halt_nonsmp;
void (*_machine_power_off)(void) = do_machine_power_off_nonsmp;
#endif

 /*
 * Reboot, halt and power_off stubs. They just call _machine_restart,
 * _machine_halt or _machine_power_off. 
 */

void machine_restart(char *command)
{
	console_unblank();
	_machine_restart(command);
}

EXPORT_SYMBOL(machine_restart);

void machine_halt(void)
{
	console_unblank();
	_machine_halt();
}

EXPORT_SYMBOL(machine_halt);

void machine_power_off(void)
{
	console_unblank();
	_machine_power_off();
}

EXPORT_SYMBOL(machine_power_off);

/*
 * Setup function called from init/main.c just after the banner
 * was printed.
 */
extern char _pstart, _pend, _stext;

void __init setup_arch(char **cmdline_p)
{
        unsigned long bootmap_size;
        unsigned long memory_start, memory_end;
        char c = ' ', cn, *to = command_line, *from = COMMAND_LINE;
	unsigned long start_pfn, end_pfn;
        static unsigned int smptrap=0;
        unsigned long delay = 0;
	struct _lowcore *lc;
	int i;

        if (smptrap)
                return;
        smptrap=1;

        /*
         * print what head.S has found out about the machine 
         */
#ifndef CONFIG_ARCH_S390X
	printk((MACHINE_IS_VM) ?
	       "We are running under VM (31 bit mode)\n" :
	       "We are running native (31 bit mode)\n");
	printk((MACHINE_HAS_IEEE) ?
	       "This machine has an IEEE fpu\n" :
	       "This machine has no IEEE fpu\n");
#else /* CONFIG_ARCH_S390X */
	printk((MACHINE_IS_VM) ?
	       "We are running under VM (64 bit mode)\n" :
	       "We are running native (64 bit mode)\n");
#endif /* CONFIG_ARCH_S390X */

        ROOT_DEV = Root_RAM0;
        memory_start = (unsigned long) &_end;    /* fixit if use $CODELO etc*/
#ifndef CONFIG_ARCH_S390X
	memory_end = memory_size & ~0x400000UL;  /* align memory end to 4MB */
        /*
         * We need some free virtual space to be able to do vmalloc.
         * On a machine with 2GB memory we make sure that we have at
         * least 128 MB free space for vmalloc.
         */
        if (memory_end > 1920*1024*1024)
                memory_end = 1920*1024*1024;
#else /* CONFIG_ARCH_S390X */
	memory_end = memory_size & ~0x200000UL;  /* detected in head.s */
#endif /* CONFIG_ARCH_S390X */
        init_mm.start_code = PAGE_OFFSET;
        init_mm.end_code = (unsigned long) &_etext;
        init_mm.end_data = (unsigned long) &_edata;
        init_mm.brk = (unsigned long) &_end;

	code_resource.start = (unsigned long) &_text;
	code_resource.end = (unsigned long) &_etext - 1;
	data_resource.start = (unsigned long) &_etext;
	data_resource.end = (unsigned long) &_edata - 1;

        /* Save unparsed command line copy for /proc/cmdline */
        memcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
        saved_command_line[COMMAND_LINE_SIZE-1] = '\0';

        for (;;) {
                /*
                 * "mem=XXX[kKmM]" sets memsize 
                 */
                if (c == ' ' && strncmp(from, "mem=", 4) == 0) {
                        memory_end = simple_strtoul(from+4, &from, 0);
                        if ( *from == 'K' || *from == 'k' ) {
                                memory_end = memory_end << 10;
                                from++;
                        } else if ( *from == 'M' || *from == 'm' ) {
                                memory_end = memory_end << 20;
                                from++;
                        }
                }
                /*
                 * "ipldelay=XXX[sm]" sets ipl delay in seconds or minutes
                 */
                if (c == ' ' && strncmp(from, "ipldelay=", 9) == 0) {
                        delay = simple_strtoul(from+9, &from, 0);
			if (*from == 's' || *from == 'S') {
				delay = delay*1000000;
				from++;
			} else if (*from == 'm' || *from == 'M') {
				delay = delay*60*1000000;
				from++;
			}
			/* now wait for the requested amount of time */
			udelay(delay);
                }
                cn = *(from++);
                if (!cn)
                        break;
                if (cn == '\n')
                        cn = ' ';  /* replace newlines with space */
		if (cn == 0x0d)
			cn = ' ';  /* replace 0x0d with space */
                if (cn == ' ' && c == ' ')
                        continue;  /* remove additional spaces */
                c = cn;
                if (to - command_line >= COMMAND_LINE_SIZE)
                        break;
                *(to++) = c;
        }
        if (c == ' ' && to > command_line) to--;
        *to = '\0';
        *cmdline_p = command_line;

	/*
	 * partially used pages are not usable - thus
	 * we are rounding upwards:
	 */
	start_pfn = (__pa(&_end) + PAGE_SIZE - 1) >> PAGE_SHIFT;
	end_pfn = max_pfn = memory_end >> PAGE_SHIFT;

	/*
	 * Initialize the boot-time allocator (with low memory only):
	 */
	bootmap_size = init_bootmem(start_pfn, end_pfn);

	/*
	 * Register RAM areas with the bootmem allocator.
	 */
	for (i = 0; i < 16 && memory_chunk[i].size > 0; i++) {
		unsigned long start_chunk, end_chunk;

		if (memory_chunk[i].type != CHUNK_READ_WRITE)
			continue;
		start_chunk = (memory_chunk[i].addr + PAGE_SIZE - 1);
		start_chunk >>= PAGE_SHIFT;
		end_chunk = (memory_chunk[i].addr + memory_chunk[i].size);
		end_chunk >>= PAGE_SHIFT;
		if (start_chunk < start_pfn)
			start_chunk = start_pfn;
		if (end_chunk > end_pfn)
			end_chunk = end_pfn;
		if (start_chunk < end_chunk)
			free_bootmem(start_chunk << PAGE_SHIFT,
				     (end_chunk - start_chunk) << PAGE_SHIFT);
	}

        /*
         * Reserve the bootmem bitmap itself as well. We do this in two
         * steps (first step was init_bootmem()) because this catches
         * the (very unlikely) case of us accidentally initializing the
         * bootmem allocator with an invalid RAM area.
         */
        reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size);

#ifdef CONFIG_BLK_DEV_INITRD
        if (INITRD_START) {
		if (INITRD_START + INITRD_SIZE <= memory_end) {
			reserve_bootmem(INITRD_START, INITRD_SIZE);
			initrd_start = INITRD_START;
			initrd_end = initrd_start + INITRD_SIZE;
		} else {
                        printk("initrd extends beyond end of memory "
                               "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
                               initrd_start + INITRD_SIZE, memory_end);
                        initrd_start = initrd_end = 0;
		}
        }
#endif

	for (i = 0; i < 16 && memory_chunk[i].size > 0; i++) {
		struct resource *res;

		res = alloc_bootmem_low(sizeof(struct resource));
		res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;

		switch (memory_chunk[i].type) {
		case CHUNK_READ_WRITE:
			res->name = "System RAM";
			break;
		case CHUNK_READ_ONLY:
			res->name = "System ROM";
			res->flags |= IORESOURCE_READONLY;
			break;
		default:
			res->name = "reserved";
		}
		res->start = memory_chunk[i].addr;
		res->end = memory_chunk[i].addr +  memory_chunk[i].size - 1;
		request_resource(&iomem_resource, res);
		request_resource(res, &code_resource);
		request_resource(res, &data_resource);
	}

        /*
         * Setup lowcore for boot cpu
         */
#ifndef CONFIG_ARCH_S390X
	lc = (struct _lowcore *) __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
	memset(lc, 0, PAGE_SIZE);
#else /* CONFIG_ARCH_S390X */
	lc = (struct _lowcore *) __alloc_bootmem(2*PAGE_SIZE, 2*PAGE_SIZE, 0);
	memset(lc, 0, 2*PAGE_SIZE);
#endif /* CONFIG_ARCH_S390X */
	lc->restart_psw.mask = PSW_BASE_BITS;
	lc->restart_psw.addr =
		PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
	lc->external_new_psw.mask = PSW_KERNEL_BITS;
	lc->external_new_psw.addr =
		PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
	lc->svc_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_IO | PSW_MASK_EXT;
	lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
	lc->program_new_psw.mask = PSW_KERNEL_BITS;
	lc->program_new_psw.addr =
		PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
	lc->mcck_new_psw.mask = PSW_KERNEL_BITS;
	lc->mcck_new_psw.addr =
		PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
	lc->io_new_psw.mask = PSW_KERNEL_BITS;
	lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
	lc->ipl_device = S390_lowcore.ipl_device;
	lc->jiffy_timer = -1LL;
	lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
	lc->async_stack = (unsigned long)
		__alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
#ifdef CONFIG_CHECK_STACK
	lc->panic_stack = (unsigned long)
		__alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
#endif
	lc->current_task = (unsigned long) init_thread_union.thread_info.task;
	lc->thread_info = (unsigned long) &init_thread_union;
#ifdef CONFIG_ARCH_S390X
	if (MACHINE_HAS_DIAG44)
		lc->diag44_opcode = 0x83000044;
	else
		lc->diag44_opcode = 0x07000700;
#endif /* CONFIG_ARCH_S390X */
	set_prefix((u32)(unsigned long) lc);
        cpu_init();
        __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;

	/*
	 * Create kernel page tables and switch to virtual addressing.
	 */
        paging_init();

        /* Setup default console */
	conmode_default();
}

void print_cpu_info(struct cpuinfo_S390 *cpuinfo)
{
   printk("cpu %d "
#ifdef CONFIG_SMP
           "phys_idx=%d "
#endif
           "vers=%02X ident=%06X machine=%04X unused=%04X\n",
           cpuinfo->cpu_nr,
#ifdef CONFIG_SMP
           cpuinfo->cpu_addr,
#endif
           cpuinfo->cpu_id.version,
           cpuinfo->cpu_id.ident,
           cpuinfo->cpu_id.machine,
           cpuinfo->cpu_id.unused);
}

/*
 * show_cpuinfo - Get information on one CPU for use by procfs.
 */

static int show_cpuinfo(struct seq_file *m, void *v)
{
        struct cpuinfo_S390 *cpuinfo;
	unsigned long n = (unsigned long) v - 1;

	if (!n) {
		seq_printf(m, "vendor_id       : IBM/S390\n"
			       "# processors    : %i\n"
			       "bogomips per cpu: %lu.%02lu\n",
			       num_online_cpus(), loops_per_jiffy/(500000/HZ),
			       (loops_per_jiffy/(5000/HZ))%100);
	}
	if (cpu_online(n)) {
#ifdef CONFIG_SMP
		if (smp_processor_id() == n)
			cpuinfo = &S390_lowcore.cpu_data;
		else
			cpuinfo = &lowcore_ptr[n]->cpu_data;
#else
		cpuinfo = &S390_lowcore.cpu_data;
#endif
		seq_printf(m, "processor %li: "
			       "version = %02X,  "
			       "identification = %06X,  "
			       "machine = %04X\n",
			       n, cpuinfo->cpu_id.version,
			       cpuinfo->cpu_id.ident,
			       cpuinfo->cpu_id.machine);
	}
        return 0;
}

static void *c_start(struct seq_file *m, loff_t *pos)
{
	return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL;
}
static void *c_next(struct seq_file *m, void *v, loff_t *pos)
{
	++*pos;
	return c_start(m, pos);
}
static void c_stop(struct seq_file *m, void *v)
{
}
struct seq_operations cpuinfo_op = {
	.start	= c_start,
	.next	= c_next,
	.stop	= c_stop,
	.show	= show_cpuinfo,
};