aboutsummaryrefslogtreecommitdiff
path: root/arch/powerpc/platforms/powermac/bootx_init.c
blob: 84d7fd9bcc696ecbb2f5c94fc06c33ab25395557 (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
/*
 *  Early boot support code for BootX bootloader
 *
 *  Copyright (C) 2005 Ben. Herrenschmidt (benh@kernel.crashing.org)
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 *  as published by the Free Software Foundation; either version
 *  2 of the License, or (at your option) any later version.
 */

#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/init.h>
#include <generated/utsrelease.h>
#include <asm/sections.h>
#include <asm/prom.h>
#include <asm/page.h>
#include <asm/bootx.h>
#include <asm/btext.h>
#include <asm/io.h>

#undef DEBUG
#define SET_BOOT_BAT

#ifdef DEBUG
#define DBG(fmt...) do { bootx_printf(fmt); } while(0)
#else
#define DBG(fmt...) do { } while(0)
#endif

extern void __start(unsigned long r3, unsigned long r4, unsigned long r5);

static unsigned long __initdata bootx_dt_strbase;
static unsigned long __initdata bootx_dt_strend;
static unsigned long __initdata bootx_node_chosen;
static boot_infos_t * __initdata bootx_info;
static char __initdata bootx_disp_path[256];

/* Is boot-info compatible ? */
#define BOOT_INFO_IS_COMPATIBLE(bi) \
	((bi)->compatible_version <= BOOT_INFO_VERSION)
#define BOOT_INFO_IS_V2_COMPATIBLE(bi)	((bi)->version >= 2)
#define BOOT_INFO_IS_V4_COMPATIBLE(bi)	((bi)->version >= 4)

#ifdef CONFIG_BOOTX_TEXT
static void __init bootx_printf(const char *format, ...)
{
	const char *p, *q, *s;
	va_list args;
	unsigned long v;

	va_start(args, format);
	for (p = format; *p != 0; p = q) {
		for (q = p; *q != 0 && *q != '\n' && *q != '%'; ++q)
			;
		if (q > p)
			btext_drawtext(p, q - p);
		if (*q == 0)
			break;
		if (*q == '\n') {
			++q;
			btext_flushline();
			btext_drawstring("\r\n");
			btext_flushline();
			continue;
		}
		++q;
		if (*q == 0)
			break;
		switch (*q) {
		case 's':
			++q;
			s = va_arg(args, const char *);
			if (s == NULL)
				s = "<NULL>";
			btext_drawstring(s);
			break;
		case 'x':
			++q;
			v = va_arg(args, unsigned long);
			btext_drawhex(v);
			break;
		}
	}
}
#else /* CONFIG_BOOTX_TEXT */
static void __init bootx_printf(const char *format, ...) {}
#endif /* CONFIG_BOOTX_TEXT */

static void * __init bootx_early_getprop(unsigned long base,
					 unsigned long node,
					 char *prop)
{
	struct bootx_dt_node *np = (struct bootx_dt_node *)(base + node);
	u32 *ppp = &np->properties;

	while(*ppp) {
		struct bootx_dt_prop *pp =
			(struct bootx_dt_prop *)(base + *ppp);

		if (strcmp((char *)((unsigned long)pp->name + base),
			   prop) == 0) {
			return (void *)((unsigned long)pp->value + base);
		}
		ppp = &pp->next;
	}
	return NULL;
}

#define dt_push_token(token, mem) \
	do { \
		*(mem) = _ALIGN_UP(*(mem),4); \
		*((u32 *)*(mem)) = token; \
		*(mem) += 4; \
	} while(0)

static unsigned long __init bootx_dt_find_string(char *str)
{
	char *s, *os;

	s = os = (char *)bootx_dt_strbase;
	s += 4;
	while (s <  (char *)bootx_dt_strend) {
		if (strcmp(s, str) == 0)
			return s - os;
		s += strlen(s) + 1;
	}
	return 0;
}

static void __init bootx_dt_add_prop(char *name, void *data, int size,
				  unsigned long *mem_end)
{
	unsigned long soff = bootx_dt_find_string(name);
	if (data == NULL)
		size = 0;
	if (soff == 0) {
		bootx_printf("WARNING: Can't find string index for <%s>\n",
			     name);
		return;
	}
	if (size > 0x20000) {
		bootx_printf("WARNING: ignoring large property ");
		bootx_printf("%s length 0x%x\n", name, size);
		return;
	}
	dt_push_token(OF_DT_PROP, mem_end);
	dt_push_token(size, mem_end);
	dt_push_token(soff, mem_end);

	/* push property content */
	if (size && data) {
		memcpy((void *)*mem_end, data, size);
		*mem_end = _ALIGN_UP(*mem_end + size, 4);
	}
}

static void __init bootx_add_chosen_props(unsigned long base,
					  unsigned long *mem_end)
{
	u32 val;

	bootx_dt_add_prop("linux,bootx", NULL, 0, mem_end);

	if (bootx_info->kernelParamsOffset) {
		char *args = (char *)((unsigned long)bootx_info) +
			bootx_info->kernelParamsOffset;
		bootx_dt_add_prop("bootargs", args, strlen(args) + 1, mem_end);
	}
	if (bootx_info->ramDisk) {
		val = ((unsigned long)bootx_info) + bootx_info->ramDisk;
		bootx_dt_add_prop("linux,initrd-start", &val, 4, mem_end);
		val += bootx_info->ramDiskSize;
		bootx_dt_add_prop("linux,initrd-end", &val, 4, mem_end);
	}
	if (strlen(bootx_disp_path))
		bootx_dt_add_prop("linux,stdout-path", bootx_disp_path,
				  strlen(bootx_disp_path) + 1, mem_end);
}

static void __init bootx_add_display_props(unsigned long base,
					   unsigned long *mem_end,
					   int has_real_node)
{
	boot_infos_t *bi = bootx_info;
	u32 tmp;

	if (has_real_node) {
		bootx_dt_add_prop("linux,boot-display", NULL, 0, mem_end);
		bootx_dt_add_prop("linux,opened", NULL, 0, mem_end);
	} else
		bootx_dt_add_prop("linux,bootx-noscreen", NULL, 0, mem_end);

	tmp = bi->dispDeviceDepth;
	bootx_dt_add_prop("linux,bootx-depth", &tmp, 4, mem_end);
	tmp = bi->dispDeviceRect[2] - bi->dispDeviceRect[0];
	bootx_dt_add_prop("linux,bootx-width", &tmp, 4, mem_end);
	tmp = bi->dispDeviceRect[3] - bi->dispDeviceRect[1];
	bootx_dt_add_prop("linux,bootx-height", &tmp, 4, mem_end);
	tmp = bi->dispDeviceRowBytes;
	bootx_dt_add_prop("linux,bootx-linebytes", &tmp, 4, mem_end);
	tmp = (u32)bi->dispDeviceBase;
	if (tmp == 0)
		tmp = (u32)bi->logicalDisplayBase;
	tmp += bi->dispDeviceRect[1] * bi->dispDeviceRowBytes;
	tmp += bi->dispDeviceRect[0] * ((bi->dispDeviceDepth + 7) / 8);
	bootx_dt_add_prop("linux,bootx-addr", &tmp, 4, mem_end);
}

static void __init bootx_dt_add_string(char *s, unsigned long *mem_end)
{
	unsigned int l = strlen(s) + 1;
	memcpy((void *)*mem_end, s, l);
	bootx_dt_strend = *mem_end = *mem_end + l;
}

static void __init bootx_scan_dt_build_strings(unsigned long base,
					       unsigned long node,
					       unsigned long *mem_end)
{
	struct bootx_dt_node *np = (struct bootx_dt_node *)(base + node);
	u32 *cpp, *ppp = &np->properties;
	unsigned long soff;
	char *namep;

	/* Keep refs to known nodes */
	namep = np->full_name ? (char *)(base + np->full_name) : NULL;
       	if (namep == NULL) {
		bootx_printf("Node without a full name !\n");
		namep = "";
	}
	DBG("* strings: %s\n", namep);

	if (!strcmp(namep, "/chosen")) {
		DBG(" detected /chosen ! adding properties names !\n");
		bootx_dt_add_string("linux,bootx", mem_end);
		bootx_dt_add_string("linux,stdout-path", mem_end);
		bootx_dt_add_string("linux,initrd-start", mem_end);
		bootx_dt_add_string("linux,initrd-end", mem_end);
		bootx_dt_add_string("bootargs", mem_end);
		bootx_node_chosen = node;
	}
	if (node == bootx_info->dispDeviceRegEntryOffset) {
		DBG(" detected display ! adding properties names !\n");
		bootx_dt_add_string("linux,boot-display", mem_end);
		bootx_dt_add_string("linux,opened", mem_end);
		strncpy(bootx_disp_path, namep, 255);
	}

	/* get and store all property names */
	while (*ppp) {
		struct bootx_dt_prop *pp =
			(struct bootx_dt_prop *)(base + *ppp);

		namep = pp->name ? (char *)(base + pp->name) : NULL;
 		if (namep == NULL || strcmp(namep, "name") == 0)
 			goto next;
		/* get/create string entry */
		soff = bootx_dt_find_string(namep);
		if (soff == 0)
			bootx_dt_add_string(namep, mem_end);
	next:
		ppp = &pp->next;
	}

	/* do all our children */
	cpp = &np->child;
	while(*cpp) {
		np = (struct bootx_dt_node *)(base + *cpp);
		bootx_scan_dt_build_strings(base, *cpp, mem_end);
		cpp = &np->sibling;
	}
}

static void __init bootx_scan_dt_build_struct(unsigned long base,
					      unsigned long node,
					      unsigned long *mem_end)
{
	struct bootx_dt_node *np = (struct bootx_dt_node *)(base + node);
	u32 *cpp, *ppp = &np->properties;
	char *namep, *p, *ep, *lp;
	int l;

	dt_push_token(OF_DT_BEGIN_NODE, mem_end);

	/* get the node's full name */
	namep = np->full_name ? (char *)(base + np->full_name) : NULL;
	if (namep == NULL)
		namep = "";
	l = strlen(namep);

	DBG("* struct: %s\n", namep);

	/* Fixup an Apple bug where they have bogus \0 chars in the
	 * middle of the path in some properties, and extract
	 * the unit name (everything after the last '/').
	 */
	memcpy((void *)*mem_end, namep, l + 1);
	namep = (char *)*mem_end;
	for (lp = p = namep, ep = namep + l; p < ep; p++) {
		if (*p == '/')
			lp = namep;
		else if (*p != 0)
			*lp++ = *p;
	}
	*lp = 0;
	*mem_end = _ALIGN_UP((unsigned long)lp + 1, 4);

	/* get and store all properties */
	while (*ppp) {
		struct bootx_dt_prop *pp =
			(struct bootx_dt_prop *)(base + *ppp);

		namep = pp->name ? (char *)(base + pp->name) : NULL;
		/* Skip "name" */
 		if (namep == NULL || !strcmp(namep, "name"))
 			goto next;
		/* Skip "bootargs" in /chosen too as we replace it */
		if (node == bootx_node_chosen && !strcmp(namep, "bootargs"))
			goto next;

		/* push property head */
		bootx_dt_add_prop(namep,
				  pp->value ? (void *)(base + pp->value): NULL,
				  pp->length, mem_end);
	next:
		ppp = &pp->next;
	}

	if (node == bootx_node_chosen) {
		bootx_add_chosen_props(base, mem_end);
		if (bootx_info->dispDeviceRegEntryOffset == 0)
			bootx_add_display_props(base, mem_end, 0);
	}
	else if (node == bootx_info->dispDeviceRegEntryOffset)
		bootx_add_display_props(base, mem_end, 1);

	/* do all our children */
	cpp = &np->child;
	while(*cpp) {
		np = (struct bootx_dt_node *)(base + *cpp);
		bootx_scan_dt_build_struct(base, *cpp, mem_end);
		cpp = &np->sibling;
	}

	dt_push_token(OF_DT_END_NODE, mem_end);
}

static unsigned long __init bootx_flatten_dt(unsigned long start)
{
	boot_infos_t *bi = bootx_info;
	unsigned long mem_start, mem_end;
	struct boot_param_header *hdr;
	unsigned long base;
	u64 *rsvmap;

	/* Start using memory after the big blob passed by BootX, get
	 * some space for the header
	 */
	mem_start = mem_end = _ALIGN_UP(((unsigned long)bi) + start, 4);
	DBG("Boot params header at: %x\n", mem_start);
	hdr = (struct boot_param_header *)mem_start;
	mem_end += sizeof(struct boot_param_header);
	rsvmap = (u64 *)(_ALIGN_UP(mem_end, 8));
	hdr->off_mem_rsvmap = ((unsigned long)rsvmap) - mem_start;
	mem_end = ((unsigned long)rsvmap) + 8 * sizeof(u64);

	/* Get base of tree */
	base = ((unsigned long)bi) + bi->deviceTreeOffset;

	/* Build string array */
	DBG("Building string array at: %x\n", mem_end);
	DBG("Device Tree Base=%x\n", base);
	bootx_dt_strbase = mem_end;
	mem_end += 4;
	bootx_dt_strend = mem_end;
	bootx_scan_dt_build_strings(base, 4, &mem_end);
	/* Add some strings */
	bootx_dt_add_string("linux,bootx-noscreen", &mem_end);
	bootx_dt_add_string("linux,bootx-depth", &mem_end);
	bootx_dt_add_string("linux,bootx-width", &mem_end);
	bootx_dt_add_string("linux,bootx-height", &mem_end);
	bootx_dt_add_string("linux,bootx-linebytes", &mem_end);
	bootx_dt_add_string("linux,bootx-addr", &mem_end);
	/* Wrap up strings */
	hdr->off_dt_strings = bootx_dt_strbase - mem_start;
	hdr->dt_strings_size = bootx_dt_strend - bootx_dt_strbase;

	/* Build structure */
	mem_end = _ALIGN(mem_end, 16);
	DBG("Building device tree structure at: %x\n", mem_end);
	hdr->off_dt_struct = mem_end - mem_start;
	bootx_scan_dt_build_struct(base, 4, &mem_end);
	dt_push_token(OF_DT_END, &mem_end);

	/* Finish header */
	hdr->boot_cpuid_phys = 0;
	hdr->magic = OF_DT_HEADER;
	hdr->totalsize = mem_end - mem_start;
	hdr->version = OF_DT_VERSION;
	/* Version 16 is not backward compatible */
	hdr->last_comp_version = 0x10;

	/* Reserve the whole thing and copy the reserve map in, we
	 * also bump mem_reserve_cnt to cause further reservations to
	 * fail since it's too late.
	 */
	mem_end = _ALIGN(mem_end, PAGE_SIZE);
	DBG("End of boot params: %x\n", mem_end);
	rsvmap[0] = mem_start;
	rsvmap[1] = mem_end;
	if (bootx_info->ramDisk) {
		rsvmap[2] = ((unsigned long)bootx_info) + bootx_info->ramDisk;
		rsvmap[3] = rsvmap[2] + bootx_info->ramDiskSize;
		rsvmap[4] = 0;
		rsvmap[5] = 0;
	} else {
		rsvmap[2] = 0;
		rsvmap[3] = 0;
	}

	return (unsigned long)hdr;
}


#ifdef CONFIG_BOOTX_TEXT
static void __init btext_welcome(boot_infos_t *bi)
{
	unsigned long flags;
	unsigned long pvr;

	bootx_printf("Welcome to Linux, kernel " UTS_RELEASE "\n");
	bootx_printf("\nlinked at        : 0x%x", KERNELBASE);
	bootx_printf("\nframe buffer at  : 0x%x", bi->dispDeviceBase);
	bootx_printf(" (phys), 0x%x", bi->logicalDisplayBase);
	bootx_printf(" (log)");
	bootx_printf("\nklimit           : 0x%x",(unsigned long)klimit);
	bootx_printf("\nboot_info at     : 0x%x", bi);
	__asm__ __volatile__ ("mfmsr %0" : "=r" (flags));
	bootx_printf("\nMSR              : 0x%x", flags);
	__asm__ __volatile__ ("mfspr %0, 287" : "=r" (pvr));
	bootx_printf("\nPVR              : 0x%x", pvr);
	pvr >>= 16;
	if (pvr > 1) {
	    __asm__ __volatile__ ("mfspr %0, 1008" : "=r" (flags));
	    bootx_printf("\nHID0             : 0x%x", flags);
	}
	if (pvr == 8 || pvr == 12 || pvr == 0x800c) {
	    __asm__ __volatile__ ("mfspr %0, 1019" : "=r" (flags));
	    bootx_printf("\nICTC             : 0x%x", flags);
	}
#ifdef DEBUG
	bootx_printf("\n\n");
	bootx_printf("bi->deviceTreeOffset   : 0x%x\n",
		     bi->deviceTreeOffset);
	bootx_printf("bi->deviceTreeSize     : 0x%x\n",
		     bi->deviceTreeSize);
#endif
	bootx_printf("\n\n");
}
#endif /* CONFIG_BOOTX_TEXT */

void __init bootx_init(unsigned long r3, unsigned long r4)
{
	boot_infos_t *bi = (boot_infos_t *) r4;
	unsigned long hdr;
	unsigned long space;
	unsigned long ptr, x;
	char *model;
	unsigned long offset = reloc_offset();

	reloc_got2(offset);

	bootx_info = bi;

	/* We haven't cleared any bss at this point, make sure
	 * what we need is initialized
	 */
	bootx_dt_strbase = bootx_dt_strend = 0;
	bootx_node_chosen = 0;
	bootx_disp_path[0] = 0;

	if (!BOOT_INFO_IS_V2_COMPATIBLE(bi))
		bi->logicalDisplayBase = bi->dispDeviceBase;

	/* Fixup depth 16 -> 15 as that's what MacOS calls 16bpp */
	if (bi->dispDeviceDepth == 16)
		bi->dispDeviceDepth = 15;


#ifdef CONFIG_BOOTX_TEXT
	ptr = (unsigned long)bi->logicalDisplayBase;
	ptr += bi->dispDeviceRect[1] * bi->dispDeviceRowBytes;
	ptr += bi->dispDeviceRect[0] * ((bi->dispDeviceDepth + 7) / 8);
	btext_setup_display(bi->dispDeviceRect[2] - bi->dispDeviceRect[0],
			    bi->dispDeviceRect[3] - bi->dispDeviceRect[1],
			    bi->dispDeviceDepth, bi->dispDeviceRowBytes,
			    (unsigned long)bi->logicalDisplayBase);
	btext_clearscreen();
	btext_flushscreen();
#endif /* CONFIG_BOOTX_TEXT */

	/*
	 * Test if boot-info is compatible.  Done only in config
	 * CONFIG_BOOTX_TEXT since there is nothing much we can do
	 * with an incompatible version, except display a message
	 * and eventually hang the processor...
	 *
	 * I'll try to keep enough of boot-info compatible in the
	 * future to always allow display of this message;
	 */
	if (!BOOT_INFO_IS_COMPATIBLE(bi)) {
		bootx_printf(" !!! WARNING - Incompatible version"
			     " of BootX !!!\n\n\n");
		for (;;)
			;
	}
	if (bi->architecture != BOOT_ARCH_PCI) {
		bootx_printf(" !!! WARNING - Usupported machine"
			     " architecture !\n");
		for (;;)
			;
	}

#ifdef CONFIG_BOOTX_TEXT
	btext_welcome(bi);
#endif

	/* New BootX enters kernel with MMU off, i/os are not allowed
	 * here. This hack will have been done by the boostrap anyway.
	 */
	if (bi->version < 4) {
		/*
		 * XXX If this is an iMac, turn off the USB controller.
		 */
		model = (char *) bootx_early_getprop(r4 + bi->deviceTreeOffset,
						     4, "model");
		if (model
		    && (strcmp(model, "iMac,1") == 0
			|| strcmp(model, "PowerMac1,1") == 0)) {
			bootx_printf("iMac,1 detected, shutting down USB\n");
			out_le32((unsigned __iomem *)0x80880008, 1);	/* XXX */
		}
	}

	/* Get a pointer that points above the device tree, args, ramdisk,
	 * etc... to use for generating the flattened tree
	 */
	if (bi->version < 5) {
		space = bi->deviceTreeOffset + bi->deviceTreeSize;
		if (bi->ramDisk >= space)
			space = bi->ramDisk + bi->ramDiskSize;
	} else
		space = bi->totalParamsSize;

	bootx_printf("Total space used by parameters & ramdisk: 0x%x\n", space);

	/* New BootX will have flushed all TLBs and enters kernel with
	 * MMU switched OFF, so this should not be useful anymore.
	 */
	if (bi->version < 4) {
		bootx_printf("Touching pages...\n");

		/*
		 * Touch each page to make sure the PTEs for them
		 * are in the hash table - the aim is to try to avoid
		 * getting DSI exceptions while copying the kernel image.
		 */
		for (ptr = ((unsigned long) &_stext) & PAGE_MASK;
		     ptr < (unsigned long)bi + space; ptr += PAGE_SIZE)
			x = *(volatile unsigned long *)ptr;
	}

	/* Ok, now we need to generate a flattened device-tree to pass
	 * to the kernel
	 */
	bootx_printf("Preparing boot params...\n");

	hdr = bootx_flatten_dt(space);

#ifdef CONFIG_BOOTX_TEXT
#ifdef SET_BOOT_BAT
	bootx_printf("Preparing BAT...\n");
	btext_prepare_BAT();
#else
	btext_unmap();
#endif
#endif

	reloc_got2(-offset);

	__start(hdr, KERNELBASE + offset, 0);
}