[PATCH] create struct compat_timex and use it everywhere
[linux-2.6] / arch / s390 / kernel / setup.c
1 /*
2  *  arch/s390/kernel/setup.c
3  *
4  *  S390 version
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)
8  *
9  *  Derived from "arch/i386/kernel/setup.c"
10  *    Copyright (C) 1995, Linus Torvalds
11  */
12
13 /*
14  * This file handles the architecture-dependent parts of initialization
15  */
16
17 #include <linux/errno.h>
18 #include <linux/module.h>
19 #include <linux/sched.h>
20 #include <linux/kernel.h>
21 #include <linux/mm.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>
39 #include <linux/device.h>
40
41 #include <asm/uaccess.h>
42 #include <asm/system.h>
43 #include <asm/smp.h>
44 #include <asm/mmu_context.h>
45 #include <asm/cpcmd.h>
46 #include <asm/lowcore.h>
47 #include <asm/irq.h>
48 #include <asm/page.h>
49 #include <asm/ptrace.h>
50
51 /*
52  * Machine setup..
53  */
54 unsigned int console_mode = 0;
55 unsigned int console_devno = -1;
56 unsigned int console_irq = -1;
57 unsigned long memory_size = 0;
58 unsigned long machine_flags = 0;
59 struct {
60         unsigned long addr, size, type;
61 } memory_chunk[MEMORY_CHUNKS] = { { 0 } };
62 #define CHUNK_READ_WRITE 0
63 #define CHUNK_READ_ONLY 1
64 volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
65 unsigned long __initdata zholes_size[MAX_NR_ZONES];
66 static unsigned long __initdata memory_end;
67
68 /*
69  * Setup options
70  */
71 extern int _text,_etext, _edata, _end;
72
73 /*
74  * This is set up by the setup-routine at boot-time
75  * for S390 need to find out, what we have to setup
76  * using address 0x10400 ...
77  */
78
79 #include <asm/setup.h>
80
81 static struct resource code_resource = {
82         .name  = "Kernel code",
83         .start = (unsigned long) &_text,
84         .end = (unsigned long) &_etext - 1,
85         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
86 };
87
88 static struct resource data_resource = {
89         .name = "Kernel data",
90         .start = (unsigned long) &_etext,
91         .end = (unsigned long) &_edata - 1,
92         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
93 };
94
95 /*
96  * cpu_init() initializes state that is per-CPU.
97  */
98 void __devinit cpu_init (void)
99 {
100         int addr = hard_smp_processor_id();
101
102         /*
103          * Store processor id in lowcore (used e.g. in timer_interrupt)
104          */
105         asm volatile ("stidp %0": "=m" (S390_lowcore.cpu_data.cpu_id));
106         S390_lowcore.cpu_data.cpu_addr = addr;
107
108         /*
109          * Force FPU initialization:
110          */
111         clear_thread_flag(TIF_USEDFPU);
112         clear_used_math();
113
114         atomic_inc(&init_mm.mm_count);
115         current->active_mm = &init_mm;
116         if (current->mm)
117                 BUG();
118         enter_lazy_tlb(&init_mm, current);
119 }
120
121 /*
122  * VM halt and poweroff setup routines
123  */
124 char vmhalt_cmd[128] = "";
125 char vmpoff_cmd[128] = "";
126
127 static inline void strncpy_skip_quote(char *dst, char *src, int n)
128 {
129         int sx, dx;
130
131         dx = 0;
132         for (sx = 0; src[sx] != 0; sx++) {
133                 if (src[sx] == '"') continue;
134                 dst[dx++] = src[sx];
135                 if (dx >= n) break;
136         }
137 }
138
139 static int __init vmhalt_setup(char *str)
140 {
141         strncpy_skip_quote(vmhalt_cmd, str, 127);
142         vmhalt_cmd[127] = 0;
143         return 1;
144 }
145
146 __setup("vmhalt=", vmhalt_setup);
147
148 static int __init vmpoff_setup(char *str)
149 {
150         strncpy_skip_quote(vmpoff_cmd, str, 127);
151         vmpoff_cmd[127] = 0;
152         return 1;
153 }
154
155 __setup("vmpoff=", vmpoff_setup);
156
157 /*
158  * condev= and conmode= setup parameter.
159  */
160
161 static int __init condev_setup(char *str)
162 {
163         int vdev;
164
165         vdev = simple_strtoul(str, &str, 0);
166         if (vdev >= 0 && vdev < 65536) {
167                 console_devno = vdev;
168                 console_irq = -1;
169         }
170         return 1;
171 }
172
173 __setup("condev=", condev_setup);
174
175 static int __init conmode_setup(char *str)
176 {
177 #if defined(CONFIG_SCLP_CONSOLE)
178         if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
179                 SET_CONSOLE_SCLP;
180 #endif
181 #if defined(CONFIG_TN3215_CONSOLE)
182         if (strncmp(str, "3215", 5) == 0)
183                 SET_CONSOLE_3215;
184 #endif
185 #if defined(CONFIG_TN3270_CONSOLE)
186         if (strncmp(str, "3270", 5) == 0)
187                 SET_CONSOLE_3270;
188 #endif
189         return 1;
190 }
191
192 __setup("conmode=", conmode_setup);
193
194 static void __init conmode_default(void)
195 {
196         char query_buffer[1024];
197         char *ptr;
198
199         if (MACHINE_IS_VM) {
200                 __cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
201                 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
202                 ptr = strstr(query_buffer, "SUBCHANNEL =");
203                 console_irq = simple_strtoul(ptr + 13, NULL, 16);
204                 __cpcmd("QUERY TERM", query_buffer, 1024, NULL);
205                 ptr = strstr(query_buffer, "CONMODE");
206                 /*
207                  * Set the conmode to 3215 so that the device recognition 
208                  * will set the cu_type of the console to 3215. If the
209                  * conmode is 3270 and we don't set it back then both
210                  * 3215 and the 3270 driver will try to access the console
211                  * device (3215 as console and 3270 as normal tty).
212                  */
213                 __cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
214                 if (ptr == NULL) {
215 #if defined(CONFIG_SCLP_CONSOLE)
216                         SET_CONSOLE_SCLP;
217 #endif
218                         return;
219                 }
220                 if (strncmp(ptr + 8, "3270", 4) == 0) {
221 #if defined(CONFIG_TN3270_CONSOLE)
222                         SET_CONSOLE_3270;
223 #elif defined(CONFIG_TN3215_CONSOLE)
224                         SET_CONSOLE_3215;
225 #elif defined(CONFIG_SCLP_CONSOLE)
226                         SET_CONSOLE_SCLP;
227 #endif
228                 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
229 #if defined(CONFIG_TN3215_CONSOLE)
230                         SET_CONSOLE_3215;
231 #elif defined(CONFIG_TN3270_CONSOLE)
232                         SET_CONSOLE_3270;
233 #elif defined(CONFIG_SCLP_CONSOLE)
234                         SET_CONSOLE_SCLP;
235 #endif
236                 }
237         } else if (MACHINE_IS_P390) {
238 #if defined(CONFIG_TN3215_CONSOLE)
239                 SET_CONSOLE_3215;
240 #elif defined(CONFIG_TN3270_CONSOLE)
241                 SET_CONSOLE_3270;
242 #endif
243         } else {
244 #if defined(CONFIG_SCLP_CONSOLE)
245                 SET_CONSOLE_SCLP;
246 #endif
247         }
248 }
249
250 #ifdef CONFIG_SMP
251 extern void machine_restart_smp(char *);
252 extern void machine_halt_smp(void);
253 extern void machine_power_off_smp(void);
254
255 void (*_machine_restart)(char *command) = machine_restart_smp;
256 void (*_machine_halt)(void) = machine_halt_smp;
257 void (*_machine_power_off)(void) = machine_power_off_smp;
258 #else
259 /*
260  * Reboot, halt and power_off routines for non SMP.
261  */
262 extern void reipl(unsigned long devno);
263 extern void reipl_diag(void);
264 static void do_machine_restart_nonsmp(char * __unused)
265 {
266         reipl_diag();
267
268         if (MACHINE_IS_VM)
269                 cpcmd ("IPL", NULL, 0, NULL);
270         else
271                 reipl (0x10000 | S390_lowcore.ipl_device);
272 }
273
274 static void do_machine_halt_nonsmp(void)
275 {
276         if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0)
277                 cpcmd(vmhalt_cmd, NULL, 0, NULL);
278         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
279 }
280
281 static void do_machine_power_off_nonsmp(void)
282 {
283         if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0)
284                 cpcmd(vmpoff_cmd, NULL, 0, NULL);
285         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
286 }
287
288 void (*_machine_restart)(char *command) = do_machine_restart_nonsmp;
289 void (*_machine_halt)(void) = do_machine_halt_nonsmp;
290 void (*_machine_power_off)(void) = do_machine_power_off_nonsmp;
291 #endif
292
293  /*
294  * Reboot, halt and power_off stubs. They just call _machine_restart,
295  * _machine_halt or _machine_power_off. 
296  */
297
298 void machine_restart(char *command)
299 {
300         console_unblank();
301         _machine_restart(command);
302 }
303
304 void machine_halt(void)
305 {
306         console_unblank();
307         _machine_halt();
308 }
309
310 void machine_power_off(void)
311 {
312         console_unblank();
313         _machine_power_off();
314 }
315
316 /*
317  * Dummy power off function.
318  */
319 void (*pm_power_off)(void) = machine_power_off;
320
321 static void __init
322 add_memory_hole(unsigned long start, unsigned long end)
323 {
324         unsigned long dma_pfn = MAX_DMA_ADDRESS >> PAGE_SHIFT;
325
326         if (end <= dma_pfn)
327                 zholes_size[ZONE_DMA] += end - start + 1;
328         else if (start > dma_pfn)
329                 zholes_size[ZONE_NORMAL] += end - start + 1;
330         else {
331                 zholes_size[ZONE_DMA] += dma_pfn - start + 1;
332                 zholes_size[ZONE_NORMAL] += end - dma_pfn;
333         }
334 }
335
336 static int __init early_parse_mem(char *p)
337 {
338         memory_end = memparse(p, &p);
339         return 0;
340 }
341 early_param("mem", early_parse_mem);
342
343 /*
344  * "ipldelay=XXX[sm]" sets ipl delay in seconds or minutes
345  */
346 static int __init early_parse_ipldelay(char *p)
347 {
348         unsigned long delay = 0;
349
350         delay = simple_strtoul(p, &p, 0);
351
352         switch (*p) {
353         case 's':
354         case 'S':
355                 delay *= 1000000;
356                 break;
357         case 'm':
358         case 'M':
359                 delay *= 60 * 1000000;
360         }
361
362         /* now wait for the requested amount of time */
363         udelay(delay);
364
365         return 0;
366 }
367 early_param("ipldelay", early_parse_ipldelay);
368
369 static void __init
370 setup_lowcore(void)
371 {
372         struct _lowcore *lc;
373         int lc_pages;
374
375         /*
376          * Setup lowcore for boot cpu
377          */
378         lc_pages = sizeof(void *) == 8 ? 2 : 1;
379         lc = (struct _lowcore *)
380                 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
381         memset(lc, 0, lc_pages * PAGE_SIZE);
382         lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
383         lc->restart_psw.addr =
384                 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
385         lc->external_new_psw.mask = PSW_KERNEL_BITS;
386         lc->external_new_psw.addr =
387                 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
388         lc->svc_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_IO | PSW_MASK_EXT;
389         lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
390         lc->program_new_psw.mask = PSW_KERNEL_BITS;
391         lc->program_new_psw.addr =
392                 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
393         lc->mcck_new_psw.mask =
394                 PSW_KERNEL_BITS & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
395         lc->mcck_new_psw.addr =
396                 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
397         lc->io_new_psw.mask = PSW_KERNEL_BITS;
398         lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
399         lc->ipl_device = S390_lowcore.ipl_device;
400         lc->jiffy_timer = -1LL;
401         lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
402         lc->async_stack = (unsigned long)
403                 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
404         lc->panic_stack = (unsigned long)
405                 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
406         lc->current_task = (unsigned long) init_thread_union.thread_info.task;
407         lc->thread_info = (unsigned long) &init_thread_union;
408 #ifndef CONFIG_64BIT
409         if (MACHINE_HAS_IEEE) {
410                 lc->extended_save_area_addr = (__u32)
411                         __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
412                 /* enable extended save area */
413                 ctl_set_bit(14, 29);
414         }
415 #endif
416         set_prefix((u32)(unsigned long) lc);
417 }
418
419 static void __init
420 setup_resources(void)
421 {
422         struct resource *res;
423         int i;
424
425         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
426                 res = alloc_bootmem_low(sizeof(struct resource));
427                 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
428                 switch (memory_chunk[i].type) {
429                 case CHUNK_READ_WRITE:
430                         res->name = "System RAM";
431                         break;
432                 case CHUNK_READ_ONLY:
433                         res->name = "System ROM";
434                         res->flags |= IORESOURCE_READONLY;
435                         break;
436                 default:
437                         res->name = "reserved";
438                 }
439                 res->start = memory_chunk[i].addr;
440                 res->end = memory_chunk[i].addr +  memory_chunk[i].size - 1;
441                 request_resource(&iomem_resource, res);
442                 request_resource(res, &code_resource);
443                 request_resource(res, &data_resource);
444         }
445 }
446
447 static void __init
448 setup_memory(void)
449 {
450         unsigned long bootmap_size;
451         unsigned long start_pfn, end_pfn, init_pfn;
452         unsigned long last_rw_end;
453         int i;
454
455         /*
456          * partially used pages are not usable - thus
457          * we are rounding upwards:
458          */
459         start_pfn = (__pa(&_end) + PAGE_SIZE - 1) >> PAGE_SHIFT;
460         end_pfn = max_pfn = memory_end >> PAGE_SHIFT;
461
462         /* Initialize storage key for kernel pages */
463         for (init_pfn = 0 ; init_pfn < start_pfn; init_pfn++)
464                 page_set_storage_key(init_pfn << PAGE_SHIFT, PAGE_DEFAULT_KEY);
465
466         /*
467          * Initialize the boot-time allocator (with low memory only):
468          */
469         bootmap_size = init_bootmem(start_pfn, end_pfn);
470
471         /*
472          * Register RAM areas with the bootmem allocator.
473          */
474         last_rw_end = start_pfn;
475
476         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
477                 unsigned long start_chunk, end_chunk;
478
479                 if (memory_chunk[i].type != CHUNK_READ_WRITE)
480                         continue;
481                 start_chunk = (memory_chunk[i].addr + PAGE_SIZE - 1);
482                 start_chunk >>= PAGE_SHIFT;
483                 end_chunk = (memory_chunk[i].addr + memory_chunk[i].size);
484                 end_chunk >>= PAGE_SHIFT;
485                 if (start_chunk < start_pfn)
486                         start_chunk = start_pfn;
487                 if (end_chunk > end_pfn)
488                         end_chunk = end_pfn;
489                 if (start_chunk < end_chunk) {
490                         /* Initialize storage key for RAM pages */
491                         for (init_pfn = start_chunk ; init_pfn < end_chunk;
492                              init_pfn++)
493                                 page_set_storage_key(init_pfn << PAGE_SHIFT,
494                                                      PAGE_DEFAULT_KEY);
495                         free_bootmem(start_chunk << PAGE_SHIFT,
496                                      (end_chunk - start_chunk) << PAGE_SHIFT);
497                         if (last_rw_end < start_chunk)
498                                 add_memory_hole(last_rw_end, start_chunk - 1);
499                         last_rw_end = end_chunk;
500                 }
501         }
502
503         psw_set_key(PAGE_DEFAULT_KEY);
504
505         if (last_rw_end < end_pfn - 1)
506                 add_memory_hole(last_rw_end, end_pfn - 1);
507
508         /*
509          * Reserve the bootmem bitmap itself as well. We do this in two
510          * steps (first step was init_bootmem()) because this catches
511          * the (very unlikely) case of us accidentally initializing the
512          * bootmem allocator with an invalid RAM area.
513          */
514         reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size);
515
516 #ifdef CONFIG_BLK_DEV_INITRD
517         if (INITRD_START) {
518                 if (INITRD_START + INITRD_SIZE <= memory_end) {
519                         reserve_bootmem(INITRD_START, INITRD_SIZE);
520                         initrd_start = INITRD_START;
521                         initrd_end = initrd_start + INITRD_SIZE;
522                 } else {
523                         printk("initrd extends beyond end of memory "
524                                "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
525                                initrd_start + INITRD_SIZE, memory_end);
526                         initrd_start = initrd_end = 0;
527                 }
528         }
529 #endif
530 }
531
532 /*
533  * Setup function called from init/main.c just after the banner
534  * was printed.
535  */
536
537 void __init
538 setup_arch(char **cmdline_p)
539 {
540         /*
541          * print what head.S has found out about the machine
542          */
543 #ifndef CONFIG_64BIT
544         printk((MACHINE_IS_VM) ?
545                "We are running under VM (31 bit mode)\n" :
546                "We are running native (31 bit mode)\n");
547         printk((MACHINE_HAS_IEEE) ?
548                "This machine has an IEEE fpu\n" :
549                "This machine has no IEEE fpu\n");
550 #else /* CONFIG_64BIT */
551         printk((MACHINE_IS_VM) ?
552                "We are running under VM (64 bit mode)\n" :
553                "We are running native (64 bit mode)\n");
554 #endif /* CONFIG_64BIT */
555
556         /* Save unparsed command line copy for /proc/cmdline */
557         strlcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
558
559         *cmdline_p = COMMAND_LINE;
560         *(*cmdline_p + COMMAND_LINE_SIZE - 1) = '\0';
561
562         ROOT_DEV = Root_RAM0;
563
564         init_mm.start_code = PAGE_OFFSET;
565         init_mm.end_code = (unsigned long) &_etext;
566         init_mm.end_data = (unsigned long) &_edata;
567         init_mm.brk = (unsigned long) &_end;
568
569         memory_end = memory_size;
570
571         parse_early_param();
572
573 #ifndef CONFIG_64BIT
574         memory_end &= ~0x400000UL;
575
576         /*
577          * We need some free virtual space to be able to do vmalloc.
578          * On a machine with 2GB memory we make sure that we have at
579          * least 128 MB free space for vmalloc.
580          */
581         if (memory_end > 1920*1024*1024)
582                 memory_end = 1920*1024*1024;
583 #else /* CONFIG_64BIT */
584         memory_end &= ~0x200000UL;
585 #endif /* CONFIG_64BIT */
586
587         setup_memory();
588         setup_resources();
589         setup_lowcore();
590
591         cpu_init();
592         __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
593         smp_setup_cpu_possible_map();
594
595         /*
596          * Create kernel page tables and switch to virtual addressing.
597          */
598         paging_init();
599
600         /* Setup default console */
601         conmode_default();
602 }
603
604 void print_cpu_info(struct cpuinfo_S390 *cpuinfo)
605 {
606    printk("cpu %d "
607 #ifdef CONFIG_SMP
608            "phys_idx=%d "
609 #endif
610            "vers=%02X ident=%06X machine=%04X unused=%04X\n",
611            cpuinfo->cpu_nr,
612 #ifdef CONFIG_SMP
613            cpuinfo->cpu_addr,
614 #endif
615            cpuinfo->cpu_id.version,
616            cpuinfo->cpu_id.ident,
617            cpuinfo->cpu_id.machine,
618            cpuinfo->cpu_id.unused);
619 }
620
621 /*
622  * show_cpuinfo - Get information on one CPU for use by procfs.
623  */
624
625 static int show_cpuinfo(struct seq_file *m, void *v)
626 {
627         struct cpuinfo_S390 *cpuinfo;
628         unsigned long n = (unsigned long) v - 1;
629
630         preempt_disable();
631         if (!n) {
632                 seq_printf(m, "vendor_id       : IBM/S390\n"
633                                "# processors    : %i\n"
634                                "bogomips per cpu: %lu.%02lu\n",
635                                num_online_cpus(), loops_per_jiffy/(500000/HZ),
636                                (loops_per_jiffy/(5000/HZ))%100);
637         }
638         if (cpu_online(n)) {
639 #ifdef CONFIG_SMP
640                 if (smp_processor_id() == n)
641                         cpuinfo = &S390_lowcore.cpu_data;
642                 else
643                         cpuinfo = &lowcore_ptr[n]->cpu_data;
644 #else
645                 cpuinfo = &S390_lowcore.cpu_data;
646 #endif
647                 seq_printf(m, "processor %li: "
648                                "version = %02X,  "
649                                "identification = %06X,  "
650                                "machine = %04X\n",
651                                n, cpuinfo->cpu_id.version,
652                                cpuinfo->cpu_id.ident,
653                                cpuinfo->cpu_id.machine);
654         }
655         preempt_enable();
656         return 0;
657 }
658
659 static void *c_start(struct seq_file *m, loff_t *pos)
660 {
661         return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL;
662 }
663 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
664 {
665         ++*pos;
666         return c_start(m, pos);
667 }
668 static void c_stop(struct seq_file *m, void *v)
669 {
670 }
671 struct seq_operations cpuinfo_op = {
672         .start  = c_start,
673         .next   = c_next,
674         .stop   = c_stop,
675         .show   = show_cpuinfo,
676 };
677
678 #define DEFINE_IPL_ATTR(_name, _format, _value)                 \
679 static ssize_t ipl_##_name##_show(struct subsystem *subsys,     \
680                 char *page)                                     \
681 {                                                               \
682         return sprintf(page, _format, _value);                  \
683 }                                                               \
684 static struct subsys_attribute ipl_##_name##_attr =             \
685         __ATTR(_name, S_IRUGO, ipl_##_name##_show, NULL);
686
687 DEFINE_IPL_ATTR(wwpn, "0x%016llx\n", (unsigned long long)
688                 IPL_PARMBLOCK_START->fcp.wwpn);
689 DEFINE_IPL_ATTR(lun, "0x%016llx\n", (unsigned long long)
690                 IPL_PARMBLOCK_START->fcp.lun);
691 DEFINE_IPL_ATTR(bootprog, "%lld\n", (unsigned long long)
692                 IPL_PARMBLOCK_START->fcp.bootprog);
693 DEFINE_IPL_ATTR(br_lba, "%lld\n", (unsigned long long)
694                 IPL_PARMBLOCK_START->fcp.br_lba);
695
696 enum ipl_type_type {
697         ipl_type_unknown,
698         ipl_type_ccw,
699         ipl_type_fcp,
700 };
701
702 static enum ipl_type_type
703 get_ipl_type(void)
704 {
705         struct ipl_parameter_block *ipl = IPL_PARMBLOCK_START;
706
707         if (!IPL_DEVNO_VALID)
708                 return ipl_type_unknown;
709         if (!IPL_PARMBLOCK_VALID)
710                 return ipl_type_ccw;
711         if (ipl->hdr.header.version > IPL_MAX_SUPPORTED_VERSION)
712                 return ipl_type_unknown;
713         if (ipl->fcp.pbt != IPL_TYPE_FCP)
714                 return ipl_type_unknown;
715         return ipl_type_fcp;
716 }
717
718 static ssize_t
719 ipl_type_show(struct subsystem *subsys, char *page)
720 {
721         switch (get_ipl_type()) {
722         case ipl_type_ccw:
723                 return sprintf(page, "ccw\n");
724         case ipl_type_fcp:
725                 return sprintf(page, "fcp\n");
726         default:
727                 return sprintf(page, "unknown\n");
728         }
729 }
730
731 static struct subsys_attribute ipl_type_attr = __ATTR_RO(ipl_type);
732
733 static ssize_t
734 ipl_device_show(struct subsystem *subsys, char *page)
735 {
736         struct ipl_parameter_block *ipl = IPL_PARMBLOCK_START;
737
738         switch (get_ipl_type()) {
739         case ipl_type_ccw:
740                 return sprintf(page, "0.0.%04x\n", ipl_devno);
741         case ipl_type_fcp:
742                 return sprintf(page, "0.0.%04x\n", ipl->fcp.devno);
743         default:
744                 return 0;
745         }
746 }
747
748 static struct subsys_attribute ipl_device_attr =
749         __ATTR(device, S_IRUGO, ipl_device_show, NULL);
750
751 static struct attribute *ipl_fcp_attrs[] = {
752         &ipl_type_attr.attr,
753         &ipl_device_attr.attr,
754         &ipl_wwpn_attr.attr,
755         &ipl_lun_attr.attr,
756         &ipl_bootprog_attr.attr,
757         &ipl_br_lba_attr.attr,
758         NULL,
759 };
760
761 static struct attribute_group ipl_fcp_attr_group = {
762         .attrs = ipl_fcp_attrs,
763 };
764
765 static struct attribute *ipl_ccw_attrs[] = {
766         &ipl_type_attr.attr,
767         &ipl_device_attr.attr,
768         NULL,
769 };
770
771 static struct attribute_group ipl_ccw_attr_group = {
772         .attrs = ipl_ccw_attrs,
773 };
774
775 static struct attribute *ipl_unknown_attrs[] = {
776         &ipl_type_attr.attr,
777         NULL,
778 };
779
780 static struct attribute_group ipl_unknown_attr_group = {
781         .attrs = ipl_unknown_attrs,
782 };
783
784 static ssize_t
785 ipl_parameter_read(struct kobject *kobj, char *buf, loff_t off, size_t count)
786 {
787         unsigned int size = IPL_PARMBLOCK_SIZE;
788
789         if (off > size)
790                 return 0;
791         if (off + count > size)
792                 count = size - off;
793
794         memcpy(buf, (void *) IPL_PARMBLOCK_START + off, count);
795         return count;
796 }
797
798 static struct bin_attribute ipl_parameter_attr = {
799         .attr = {
800                 .name = "binary_parameter",
801                 .mode = S_IRUGO,
802                 .owner = THIS_MODULE,
803         },
804         .size = PAGE_SIZE,
805         .read = &ipl_parameter_read,
806 };
807
808 static ssize_t
809 ipl_scp_data_read(struct kobject *kobj, char *buf, loff_t off, size_t count)
810 {
811         unsigned int size =  IPL_PARMBLOCK_START->fcp.scp_data_len;
812         void *scp_data = &IPL_PARMBLOCK_START->fcp.scp_data;
813
814         if (off > size)
815                 return 0;
816         if (off + count > size)
817                 count = size - off;
818
819         memcpy(buf, scp_data + off, count);
820         return count;
821 }
822
823 static struct bin_attribute ipl_scp_data_attr = {
824         .attr = {
825                 .name = "scp_data",
826                 .mode = S_IRUGO,
827                 .owner = THIS_MODULE,
828         },
829         .size = PAGE_SIZE,
830         .read = &ipl_scp_data_read,
831 };
832
833 static decl_subsys(ipl, NULL, NULL);
834
835 static int __init
836 ipl_device_sysfs_register(void) {
837         int rc;
838
839         rc = firmware_register(&ipl_subsys);
840         if (rc)
841                 return rc;
842
843         switch (get_ipl_type()) {
844         case ipl_type_ccw:
845                 sysfs_create_group(&ipl_subsys.kset.kobj, &ipl_ccw_attr_group);
846                 break;
847         case ipl_type_fcp:
848                 sysfs_create_group(&ipl_subsys.kset.kobj, &ipl_fcp_attr_group);
849                 sysfs_create_bin_file(&ipl_subsys.kset.kobj,
850                                       &ipl_parameter_attr);
851                 sysfs_create_bin_file(&ipl_subsys.kset.kobj,
852                                       &ipl_scp_data_attr);
853                 break;
854         default:
855                 sysfs_create_group(&ipl_subsys.kset.kobj,
856                                    &ipl_unknown_attr_group);
857                 break;
858         }
859         return 0;
860 }
861
862 __initcall(ipl_device_sysfs_register);