Linux preempt-rt

Check our new training course

Real-Time Linux with PREEMPT_RT

Check our new training course
with Creative Commons CC-BY-SA
lecture and lab materials

Bootlin logo

Elixir Cross Referencer

  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
/*
 * PAL & SAL emulation.
 *
 * Copyright (C) 1998-2001 Hewlett-Packard Co
 * Copyright (C) 1998-2001 David Mosberger-Tang <davidm@hpl.hp.com>
 *
 * For the HP simulator, this file gets include in boot/bootloader.c.
 * For SoftSDV, this file gets included in sys_softsdv.c.
 */
#include <linux/config.h>

#ifdef CONFIG_PCI
# include <linux/pci.h>
#endif

#include <linux/efi.h>
#include <asm/io.h>
#include <asm/pal.h>
#include <asm/sal.h>

#define MB	(1024*1024UL)

#define NUM_MEM_DESCS	3

static char fw_mem[(  sizeof(struct ia64_boot_param)
		    + sizeof(efi_system_table_t)
		    + sizeof(efi_runtime_services_t)
		    + 1*sizeof(efi_config_table_t)
		    + sizeof(struct ia64_sal_systab)
		    + sizeof(struct ia64_sal_desc_entry_point)
		    + NUM_MEM_DESCS*(sizeof(efi_memory_desc_t))
		    + 1024)] __attribute__ ((aligned (8)));

#ifdef CONFIG_IA64_HP_SIM

/* Simulator system calls: */

#define SSC_EXIT	66

/*
 * Simulator system call.
 */
static long
ssc (long arg0, long arg1, long arg2, long arg3, int nr)
{
	register long r8 asm ("r8");

	asm volatile ("mov r15=%1\n\t"
		      "break 0x80001"
		      : "=r"(r8)
		      : "r"(nr), "r"(arg0), "r"(arg1), "r"(arg2), "r"(arg3));
	return r8;
}

#define SECS_PER_HOUR   (60 * 60)
#define SECS_PER_DAY    (SECS_PER_HOUR * 24)

/* Compute the `struct tm' representation of *T,
   offset OFFSET seconds east of UTC,
   and store year, yday, mon, mday, wday, hour, min, sec into *TP.
   Return nonzero if successful.  */
int
offtime (unsigned long t, efi_time_t *tp)
{
	const unsigned short int __mon_yday[2][13] =
	{
		/* Normal years.  */
		{ 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
		/* Leap years.  */
		{ 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 }
	};
	long int days, rem, y;
	const unsigned short int *ip;

	days = t / SECS_PER_DAY;
	rem = t % SECS_PER_DAY;
	while (rem < 0) {
		rem += SECS_PER_DAY;
		--days;
	}
	while (rem >= SECS_PER_DAY) {
		rem -= SECS_PER_DAY;
		++days;
	}
	tp->hour = rem / SECS_PER_HOUR;
	rem %= SECS_PER_HOUR;
	tp->minute = rem / 60;
	tp->second = rem % 60;
	/* January 1, 1970 was a Thursday.  */
	y = 1970;

#	define DIV(a, b) ((a) / (b) - ((a) % (b) < 0))
#	define LEAPS_THRU_END_OF(y) (DIV (y, 4) - DIV (y, 100) + DIV (y, 400))
#	define __isleap(year) \
	  ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))

	while (days < 0 || days >= (__isleap (y) ? 366 : 365)) {
		/* Guess a corrected year, assuming 365 days per year.  */
		long int yg = y + days / 365 - (days % 365 < 0);

		/* Adjust DAYS and Y to match the guessed year.  */
		days -= ((yg - y) * 365 + LEAPS_THRU_END_OF (yg - 1)
			 - LEAPS_THRU_END_OF (y - 1));
		y = yg;
	}
	tp->year = y;
	ip = __mon_yday[__isleap(y)];
	for (y = 11; days < (long int) ip[y]; --y)
		continue;
	days -= ip[y];
	tp->month = y + 1;
	tp->day = days + 1;
	return 1;
}

#endif /* CONFIG_IA64_HP_SIM */

/*
 * Very ugly, but we need this in the simulator only.  Once we run on
 * real hw, this can all go away.
 */
extern void pal_emulator_static (void);

asm (
"	.proc pal_emulator_static\n"
"pal_emulator_static:"
"	mov r8=-1\n"
"	mov r9=256\n"
"	;;\n"
"	cmp.gtu p6,p7=r9,r28		/* r28 <= 255? */\n"
"(p6)	br.cond.sptk.few static\n"
"	;;\n"
"	mov r9=512\n"
"	;;\n"
"	cmp.gtu p6,p7=r9,r28\n"
"(p6)	br.cond.sptk.few stacked\n"
"	;;\n"
"static:	cmp.eq p6,p7=6,r28		/* PAL_PTCE_INFO */\n"
"(p7)	br.cond.sptk.few 1f\n"
"	;;\n"
"	mov r8=0			/* status = 0 */\n"
"	movl r9=0x100000000		/* tc.base */\n"
"	movl r10=0x0000000200000003	/* count[0], count[1] */\n"
"	movl r11=0x1000000000002000	/* stride[0], stride[1] */\n"
"	br.cond.sptk.few rp\n"
"1:	cmp.eq p6,p7=14,r28		/* PAL_FREQ_RATIOS */\n"
"(p7)	br.cond.sptk.few 1f\n"
"	mov r8=0			/* status = 0 */\n"
"	movl r9 =0x100000064		/* proc_ratio (1/100) */\n"
"	movl r10=0x100000100		/* bus_ratio<<32 (1/256) */\n"
"	movl r11=0x100000064		/* itc_ratio<<32 (1/100) */\n"
"	;;\n"
"1:	cmp.eq p6,p7=19,r28		/* PAL_RSE_INFO */\n"
"(p7)	br.cond.sptk.few 1f\n"
"	mov r8=0			/* status = 0 */\n"
"	mov r9=96			/* num phys stacked */\n"
"	mov r10=0			/* hints */\n"
"	mov r11=0\n"
"	br.cond.sptk.few rp\n"
"1:	cmp.eq p6,p7=1,r28		/* PAL_CACHE_FLUSH */\n"
"(p7)	br.cond.sptk.few 1f\n"
"	mov r9=ar.lc\n"
"	movl r8=524288			/* flush 512k million cache lines (16MB) */\n"
"	;;\n"
"	mov ar.lc=r8\n"
"	movl r8=0xe000000000000000\n"
"	;;\n"
".loop:	fc r8\n"
"	add r8=32,r8\n"
"	br.cloop.sptk.few .loop\n"
"	sync.i\n"
"	;;\n"
"	srlz.i\n"
"	;;\n"
"	mov ar.lc=r9\n"
"	mov r8=r0\n"
"	;;\n"
"1:	cmp.eq p6,p7=15,r28		/* PAL_PERF_MON_INFO */\n"
"(p7)	br.cond.sptk.few 1f\n"
"	mov r8=0			/* status = 0 */\n"
"	movl r9 =0x12082004		/* generic=4 width=32 retired=8 cycles=18 */\n"
"	mov r10=0			/* reserved */\n"
"	mov r11=0			/* reserved */\n"
"	mov r16=0xffff			/* implemented PMC */\n"
"	mov r17=0xffff			/* implemented PMD */\n"
"	add r18=8,r29			/* second index */\n"
"	;;\n"
"	st8 [r29]=r16,16		/* store implemented PMC */\n"
"	st8 [r18]=r0,16			/* clear remaining bits  */\n"
"	;;\n"
"	st8 [r29]=r0,16			/* store implemented PMC */\n"
"	st8 [r18]=r0,16			/* clear remaining bits  */\n"
"	;;\n"
"	st8 [r29]=r17,16		/* store implemented PMD */\n"
"	st8 [r18]=r0,16			/* clear remaining bits  */\n"
"	mov r16=0xf0			/* cycles count capable PMC */\n"
"	;;\n"
"	st8 [r29]=r0,16			/* store implemented PMC */\n"
"	st8 [r18]=r0,16			/* clear remaining bits  */\n"
"	mov r17=0x10			/* retired bundles capable PMC */\n"
"	;;\n"
"	st8 [r29]=r16,16		/* store cycles capable */\n"
"	st8 [r18]=r0,16			/* clear remaining bits  */\n"
"	;;\n"
"	st8 [r29]=r0,16			/* store implemented PMC */\n"
"	st8 [r18]=r0,16			/* clear remaining bits  */\n"
"	;;\n"
"	st8 [r29]=r17,16		/* store retired bundle capable */\n"
"	st8 [r18]=r0,16			/* clear remaining bits  */\n"
"	;;\n"
"	st8 [r29]=r0,16			/* store implemented PMC */\n"
"	st8 [r18]=r0,16			/* clear remaining bits  */\n"
"	;;\n"
"1:	br.cond.sptk.few rp\n"
"stacked:\n"
"	br.ret.sptk.few rp\n"
"	.endp pal_emulator_static\n");

/* Macro to emulate SAL call using legacy IN and OUT calls to CF8, CFC etc.. */

#define BUILD_CMD(addr)		((0x80000000 | (addr)) & ~3)

#define REG_OFFSET(addr)	(0x00000000000000FF & (addr))
#define DEVICE_FUNCTION(addr)	(0x000000000000FF00 & (addr))
#define BUS_NUMBER(addr)	(0x0000000000FF0000 & (addr))

static efi_status_t
efi_get_time (efi_time_t *tm, efi_time_cap_t *tc)
{
#ifdef CONFIG_IA64_HP_SIM
	struct {
		int tv_sec;	/* must be 32bits to work */
		int tv_usec;
	} tv32bits;

	ssc((unsigned long) &tv32bits, 0, 0, 0, SSC_GET_TOD);

	memset(tm, 0, sizeof(*tm));
	offtime(tv32bits.tv_sec, tm);

	if (tc)
		memset(tc, 0, sizeof(*tc));
#else
#	error Not implemented yet...
#endif
	return EFI_SUCCESS;
}

static void
efi_reset_system (int reset_type, efi_status_t status, unsigned long data_size, efi_char16_t *data)
{
#ifdef CONFIG_IA64_HP_SIM
	ssc(status, 0, 0, 0, SSC_EXIT);
#else
#	error Not implemented yet...
#endif
}

static efi_status_t
efi_unimplemented (void)
{
	return EFI_UNSUPPORTED;
}

static long
sal_emulator (long index, unsigned long in1, unsigned long in2,
	      unsigned long in3, unsigned long in4, unsigned long in5,
	      unsigned long in6, unsigned long in7)
{
	register long r9 asm ("r9") = 0;
	register long r10 asm ("r10") = 0;
	register long r11 asm ("r11") = 0;
	long status;

	/*
	 * Don't do a "switch" here since that gives us code that
	 * isn't self-relocatable.
	 */
	status = 0;
	if (index == SAL_FREQ_BASE) {
		switch (in1) {
		      case SAL_FREQ_BASE_PLATFORM:
			r9 = 200000000;
			break;

		      case SAL_FREQ_BASE_INTERVAL_TIMER:
			/*
			 * Is this supposed to be the cr.itc frequency
			 * or something platform specific?  The SAL
			 * doc ain't exactly clear on this...
			 */
			r9 = 700000000;
			break;

		      case SAL_FREQ_BASE_REALTIME_CLOCK:
			r9 = 1;
			break;

		      default:
			status = -1;
			break;
		}
	} else if (index == SAL_SET_VECTORS) {
		;
	} else if (index == SAL_GET_STATE_INFO) {
		;
	} else if (index == SAL_GET_STATE_INFO_SIZE) {
		;
	} else if (index == SAL_CLEAR_STATE_INFO) {
		;
	} else if (index == SAL_MC_RENDEZ) {
		;
	} else if (index == SAL_MC_SET_PARAMS) {
		;
	} else if (index == SAL_CACHE_FLUSH) {
		;
	} else if (index == SAL_CACHE_INIT) {
		;
#ifdef CONFIG_PCI
	} else if (index == SAL_PCI_CONFIG_READ) {
		/*
		 * in1 contains the PCI configuration address and in2
		 * the size of the read.  The value that is read is
		 * returned via the general register r9.
		 */
                outl(BUILD_CMD(in1), 0xCF8);
                if (in2 == 1)                           /* Reading byte  */
                        r9 = inb(0xCFC + ((REG_OFFSET(in1) & 3)));
                else if (in2 == 2)                      /* Reading word  */
                        r9 = inw(0xCFC + ((REG_OFFSET(in1) & 2)));
                else                                    /* Reading dword */
                        r9 = inl(0xCFC);
                status = PCIBIOS_SUCCESSFUL;
	} else if (index == SAL_PCI_CONFIG_WRITE) {
	      	/*
		 * in1 contains the PCI configuration address, in2 the
		 * size of the write, and in3 the actual value to be
		 * written out.
		 */
                outl(BUILD_CMD(in1), 0xCF8);
                if (in2 == 1)                           /* Writing byte  */
                        outb(in3, 0xCFC + ((REG_OFFSET(in1) & 3)));
                else if (in2 == 2)                      /* Writing word  */
                        outw(in3, 0xCFC + ((REG_OFFSET(in1) & 2)));
                else                                    /* Writing dword */
                        outl(in3, 0xCFC);
                status = PCIBIOS_SUCCESSFUL;
#endif /* CONFIG_PCI */
	} else if (index == SAL_UPDATE_PAL) {
		;
	} else {
		status = -1;
	}
	asm volatile ("" :: "r"(r9), "r"(r10), "r"(r11));
	return status;
}


/*
 * This is here to work around a bug in egcs-1.1.1b that causes the
 * compiler to crash (seems like a bug in the new alias analysis code.
 */
void *
id (long addr)
{
	return (void *) addr;
}

struct ia64_boot_param *
sys_fw_init (const char *args, int arglen)
{
	efi_system_table_t *efi_systab;
	efi_runtime_services_t *efi_runtime;
	efi_config_table_t *efi_tables;
	struct ia64_sal_systab *sal_systab;
	efi_memory_desc_t *efi_memmap, *md;
	unsigned long *pal_desc, *sal_desc;
	struct ia64_sal_desc_entry_point *sal_ed;
	struct ia64_boot_param *bp;
	unsigned char checksum = 0;
	char *cp, *cmd_line;

	memset(fw_mem, 0, sizeof(fw_mem));

	pal_desc = (unsigned long *) &pal_emulator_static;
	sal_desc = (unsigned long *) &sal_emulator;

	cp = fw_mem;
	efi_systab  = (void *) cp; cp += sizeof(*efi_systab);
	efi_runtime = (void *) cp; cp += sizeof(*efi_runtime);
	efi_tables  = (void *) cp; cp += sizeof(*efi_tables);
	sal_systab  = (void *) cp; cp += sizeof(*sal_systab);
	sal_ed      = (void *) cp; cp += sizeof(*sal_ed);
	efi_memmap  = (void *) cp; cp += NUM_MEM_DESCS*sizeof(*efi_memmap);
	bp	    = (void *) cp; cp += sizeof(*bp);
	cmd_line    = (void *) cp;

	if (args) {
		if (arglen >= 1024)
			arglen = 1023;
		memcpy(cmd_line, args, arglen);
	} else {
		arglen = 0;
	}
	cmd_line[arglen] = '\0';

	memset(efi_systab, 0, sizeof(efi_systab));
	efi_systab->hdr.signature = EFI_SYSTEM_TABLE_SIGNATURE;
	efi_systab->hdr.revision  = EFI_SYSTEM_TABLE_REVISION;
	efi_systab->hdr.headersize = sizeof(efi_systab->hdr);
	efi_systab->fw_vendor = __pa("H\0e\0w\0l\0e\0t\0t\0-\0P\0a\0c\0k\0a\0r\0d\0\0");
	efi_systab->fw_revision = 1;
	efi_systab->runtime = __pa(efi_runtime);
	efi_systab->nr_tables = 1;
	efi_systab->tables = __pa(efi_tables);

	efi_runtime->hdr.signature = EFI_RUNTIME_SERVICES_SIGNATURE;
	efi_runtime->hdr.revision = EFI_RUNTIME_SERVICES_REVISION;
	efi_runtime->hdr.headersize = sizeof(efi_runtime->hdr);
	efi_runtime->get_time = __pa(&efi_get_time);
	efi_runtime->set_time = __pa(&efi_unimplemented);
	efi_runtime->get_wakeup_time = __pa(&efi_unimplemented);
	efi_runtime->set_wakeup_time = __pa(&efi_unimplemented);
	efi_runtime->set_virtual_address_map = __pa(&efi_unimplemented);
	efi_runtime->get_variable = __pa(&efi_unimplemented);
	efi_runtime->get_next_variable = __pa(&efi_unimplemented);
	efi_runtime->set_variable = __pa(&efi_unimplemented);
	efi_runtime->get_next_high_mono_count = __pa(&efi_unimplemented);
	efi_runtime->reset_system = __pa(&efi_reset_system);

	efi_tables->guid = SAL_SYSTEM_TABLE_GUID;
	efi_tables->table = __pa(sal_systab);

	/* fill in the SAL system table: */
	memcpy(sal_systab->signature, "SST_", 4);
	sal_systab->size = sizeof(*sal_systab);
	sal_systab->sal_rev_minor = 1;
	sal_systab->sal_rev_major = 0;
	sal_systab->entry_count = 1;

#ifdef CONFIG_IA64_GENERIC
        strcpy(sal_systab->oem_id, "Generic");
        strcpy(sal_systab->product_id, "IA-64 system");
#endif

#ifdef CONFIG_IA64_HP_SIM
	strcpy(sal_systab->oem_id, "Hewlett-Packard");
	strcpy(sal_systab->product_id, "HP-simulator");
#endif

#ifdef CONFIG_IA64_SDV
	strcpy(sal_systab->oem_id, "Intel");
	strcpy(sal_systab->product_id, "SDV");
#endif

	/* fill in an entry point: */
	sal_ed->type = SAL_DESC_ENTRY_POINT;
	sal_ed->pal_proc = __pa(pal_desc[0]);
	sal_ed->sal_proc = __pa(sal_desc[0]);
	sal_ed->gp = __pa(sal_desc[1]);

	for (cp = (char *) sal_systab; cp < (char *) efi_memmap; ++cp)
		checksum += *cp;

	sal_systab->checksum = -checksum;

	/* simulate free memory at physical address zero */
	md = &efi_memmap[0];
	md->type = EFI_BOOT_SERVICES_DATA;
	md->pad = 0;
	md->phys_addr = 0*MB;
	md->virt_addr = 0;
	md->num_pages = (1*MB) >> 12;	/* 1MB (in 4KB pages) */
	md->attribute = EFI_MEMORY_WB;

	/* fill in a memory descriptor: */
	md = &efi_memmap[1];
	md->type = EFI_CONVENTIONAL_MEMORY;
	md->pad = 0;
	md->phys_addr = 2*MB;
	md->virt_addr = 0;
	md->num_pages = (128*MB) >> 12;	/* 128MB (in 4KB pages) */
	md->attribute = EFI_MEMORY_WB;

	/* descriptor for firmware emulator: */
	md = &efi_memmap[2];
	md->type = EFI_PAL_CODE;
	md->pad = 0;
	md->phys_addr = 1*MB;
	md->virt_addr = 1*MB;
	md->num_pages = (1*MB) >> 12;	/* 1MB (in 4KB pages) */
	md->attribute = EFI_MEMORY_WB;

#if 0
	/*
	 * XXX bootmem is broken for now... (remember to NUM_MEM_DESCS
	 * if you re-enable this!)
	 */

	/* descriptor for high memory (>4GB): */
	md = &efi_memmap[3];
	md->type = EFI_CONVENTIONAL_MEMORY;
	md->pad = 0;
	md->phys_addr = 4096*MB;
	md->virt_addr = 0;
	md->num_pages = (32*MB) >> 12;	/* 32MB (in 4KB pages) */
	md->attribute = EFI_MEMORY_WB;
#endif

	bp->efi_systab = __pa(&fw_mem);
	bp->efi_memmap = __pa(efi_memmap);
	bp->efi_memmap_size = NUM_MEM_DESCS*sizeof(efi_memory_desc_t);
	bp->efi_memdesc_size = sizeof(efi_memory_desc_t);
	bp->efi_memdesc_version = 1;
	bp->command_line = __pa(cmd_line);
	bp->console_info.num_cols = 80;
	bp->console_info.num_rows = 25;
	bp->console_info.orig_x = 0;
	bp->console_info.orig_y = 24;
	bp->fpswa = 0;

	return bp;
}