aboutsummaryrefslogtreecommitdiff
path: root/arch/ia64/xen/xen_pv_ops.c
blob: bdf1acbce81c600c465a9360100dd848c8c83fa5 (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
/******************************************************************************
 * arch/ia64/xen/xen_pv_ops.c
 *
 * Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp>
 *                    VA Linux Systems Japan K.K.
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#include <linux/console.h>
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/pm.h>
#include <linux/unistd.h>

#include <asm/xen/hypervisor.h>
#include <asm/xen/xencomm.h>
#include <asm/xen/privop.h>

#include "irq_xen.h"
#include "time.h"

/***************************************************************************
 * general info
 */
static struct pv_info xen_info __initdata = {
	.kernel_rpl = 2,	/* or 1: determin at runtime */
	.paravirt_enabled = 1,
	.name = "Xen/ia64",
};

#define IA64_RSC_PL_SHIFT	2
#define IA64_RSC_PL_BIT_SIZE	2
#define IA64_RSC_PL_MASK	\
	(((1UL << IA64_RSC_PL_BIT_SIZE) - 1) << IA64_RSC_PL_SHIFT)

static void __init
xen_info_init(void)
{
	/* Xenified Linux/ia64 may run on pl = 1 or 2.
	 * determin at run time. */
	unsigned long rsc = ia64_getreg(_IA64_REG_AR_RSC);
	unsigned int rpl = (rsc & IA64_RSC_PL_MASK) >> IA64_RSC_PL_SHIFT;
	xen_info.kernel_rpl = rpl;
}

/***************************************************************************
 * pv_init_ops
 * initialization hooks.
 */

static void
xen_panic_hypercall(struct unw_frame_info *info, void *arg)
{
	current->thread.ksp = (__u64)info->sw - 16;
	HYPERVISOR_shutdown(SHUTDOWN_crash);
	/* we're never actually going to get here... */
}

static int
xen_panic_event(struct notifier_block *this, unsigned long event, void *ptr)
{
	unw_init_running(xen_panic_hypercall, NULL);
	/* we're never actually going to get here... */
	return NOTIFY_DONE;
}

static struct notifier_block xen_panic_block = {
	xen_panic_event, NULL, 0 /* try to go last */
};

static void xen_pm_power_off(void)
{
	local_irq_disable();
	HYPERVISOR_shutdown(SHUTDOWN_poweroff);
}

static void __init
xen_banner(void)
{
	printk(KERN_INFO
	       "Running on Xen! pl = %d start_info_pfn=0x%lx nr_pages=%ld "
	       "flags=0x%x\n",
	       xen_info.kernel_rpl,
	       HYPERVISOR_shared_info->arch.start_info_pfn,
	       xen_start_info->nr_pages, xen_start_info->flags);
}

static int __init
xen_reserve_memory(struct rsvd_region *region)
{
	region->start = (unsigned long)__va(
		(HYPERVISOR_shared_info->arch.start_info_pfn << PAGE_SHIFT));
	region->end   = region->start + PAGE_SIZE;
	return 1;
}

static void __init
xen_arch_setup_early(void)
{
	struct shared_info *s;
	BUG_ON(!xen_pv_domain());

	s = HYPERVISOR_shared_info;
	xen_start_info = __va(s->arch.start_info_pfn << PAGE_SHIFT);

	/* Must be done before any hypercall.  */
	xencomm_initialize();

	xen_setup_features();
	/* Register a call for panic conditions. */
	atomic_notifier_chain_register(&panic_notifier_list,
				       &xen_panic_block);
	pm_power_off = xen_pm_power_off;

	xen_ia64_enable_opt_feature();
}

static void __init
xen_arch_setup_console(char **cmdline_p)
{
	add_preferred_console("xenboot", 0, NULL);
	add_preferred_console("tty", 0, NULL);
	/* use hvc_xen */
	add_preferred_console("hvc", 0, NULL);

#if !defined(CONFIG_VT) || !defined(CONFIG_DUMMY_CONSOLE)
	conswitchp = NULL;
#endif
}

static int __init
xen_arch_setup_nomca(void)
{
	return 1;
}

static void __init
xen_post_smp_prepare_boot_cpu(void)
{
	xen_setup_vcpu_info_placement();
}

static const struct pv_init_ops xen_init_ops __initconst = {
	.banner = xen_banner,

	.reserve_memory = xen_reserve_memory,

	.arch_setup_early = xen_arch_setup_early,
	.arch_setup_console = xen_arch_setup_console,
	.arch_setup_nomca = xen_arch_setup_nomca,

	.post_smp_prepare_boot_cpu = xen_post_smp_prepare_boot_cpu,
};

/***************************************************************************
 * pv_fsys_data
 * addresses for fsys
 */

extern unsigned long xen_fsyscall_table[NR_syscalls];
extern char xen_fsys_bubble_down[];
struct pv_fsys_data xen_fsys_data __initdata = {
	.fsyscall_table = (unsigned long *)xen_fsyscall_table,
	.fsys_bubble_down = (void *)xen_fsys_bubble_down,
};

/***************************************************************************
 * pv_patchdata
 * patchdata addresses
 */

#define DECLARE(name)							\
	extern unsigned long __xen_start_gate_##name##_patchlist[];	\
	extern unsigned long __xen_end_gate_##name##_patchlist[]

DECLARE(fsyscall);
DECLARE(brl_fsys_bubble_down);
DECLARE(vtop);
DECLARE(mckinley_e9);

extern unsigned long __xen_start_gate_section[];

#define ASSIGN(name)							\
	.start_##name##_patchlist =					\
		(unsigned long)__xen_start_gate_##name##_patchlist,	\
	.end_##name##_patchlist =					\
		(unsigned long)__xen_end_gate_##name##_patchlist

static struct pv_patchdata xen_patchdata __initdata = {
	ASSIGN(fsyscall),
	ASSIGN(brl_fsys_bubble_down),
	ASSIGN(vtop),
	ASSIGN(mckinley_e9),

	.gate_section = (void*)__xen_start_gate_section,
};

/***************************************************************************
 * pv_cpu_ops
 * intrinsics hooks.
 */

static void
xen_set_itm_with_offset(unsigned long val)
{
	/* ia64_cpu_local_tick() calls this with interrupt enabled. */
	/* WARN_ON(!irqs_disabled()); */
	xen_set_itm(val - XEN_MAPPEDREGS->itc_offset);
}

static unsigned long
xen_get_itm_with_offset(void)
{
	/* unused at this moment */
	printk(KERN_DEBUG "%s is called.\n", __func__);

	WARN_ON(!irqs_disabled());
	return ia64_native_getreg(_IA64_REG_CR_ITM) +
		XEN_MAPPEDREGS->itc_offset;
}

/* ia64_set_itc() is only called by
 * cpu_init() with ia64_set_itc(0) and ia64_sync_itc().
 * So XEN_MAPPEDRESG->itc_offset cal be considered as almost constant.
 */
static void
xen_set_itc(unsigned long val)
{
	unsigned long mitc;

	WARN_ON(!irqs_disabled());
	mitc = ia64_native_getreg(_IA64_REG_AR_ITC);
	XEN_MAPPEDREGS->itc_offset = val - mitc;
	XEN_MAPPEDREGS->itc_last = val;
}

static unsigned long
xen_get_itc(void)
{
	unsigned long res;
	unsigned long itc_offset;
	unsigned long itc_last;
	unsigned long ret_itc_last;

	itc_offset = XEN_MAPPEDREGS->itc_offset;
	do {
		itc_last = XEN_MAPPEDREGS->itc_last;
		res = ia64_native_getreg(_IA64_REG_AR_ITC);
		res += itc_offset;
		if (itc_last >= res)
			res = itc_last + 1;
		ret_itc_last = cmpxchg(&XEN_MAPPEDREGS->itc_last,
				       itc_last, res);
	} while (unlikely(ret_itc_last != itc_last));
	return res;

#if 0
	/* ia64_itc_udelay() calls ia64_get_itc() with interrupt enabled.
	   Should it be paravirtualized instead? */
	WARN_ON(!irqs_disabled());
	itc_offset = XEN_MAPPEDREGS->itc_offset;
	itc_last = XEN_MAPPEDREGS->itc_last;
	res = ia64_native_getreg(_IA64_REG_AR_ITC);
	res += itc_offset;
	if (itc_last >= res)
		res = itc_last + 1;
	XEN_MAPPEDREGS->itc_last = res;
	return res;
#endif
}

static void xen_setreg(int regnum, unsigned long val)
{
	switch (regnum) {
	case _IA64_REG_AR_KR0 ... _IA64_REG_AR_KR7:
		xen_set_kr(regnum - _IA64_REG_AR_KR0, val);
		break;
#ifdef CONFIG_IA32_SUPPORT
	case _IA64_REG_AR_EFLAG:
		xen_set_eflag(val);
		break;
#endif
	case _IA64_REG_AR_ITC:
		xen_set_itc(val);
		break;
	case _IA64_REG_CR_TPR:
		xen_set_tpr(val);
		break;
	case _IA64_REG_CR_ITM:
		xen_set_itm_with_offset(val);
		break;
	case _IA64_REG_CR_EOI:
		xen_eoi(val);
		break;
	default:
		ia64_native_setreg_func(regnum, val);
		break;
	}
}

static unsigned long xen_getreg(int regnum)
{
	unsigned long res;

	switch (regnum) {
	case _IA64_REG_PSR:
		res = xen_get_psr();
		break;
#ifdef CONFIG_IA32_SUPPORT
	case _IA64_REG_AR_EFLAG:
		res = xen_get_eflag();
		break;
#endif
	case _IA64_REG_AR_ITC:
		res = xen_get_itc();
		break;
	case _IA64_REG_CR_ITM:
		res = xen_get_itm_with_offset();
		break;
	case _IA64_REG_CR_IVR:
		res = xen_get_ivr();
		break;
	case _IA64_REG_CR_TPR:
		res = xen_get_tpr();
		break;
	default:
		res = ia64_native_getreg_func(regnum);
		break;
	}
	return res;
}

/* turning on interrupts is a bit more complicated.. write to the
 * memory-mapped virtual psr.i bit first (to avoid race condition),
 * then if any interrupts were pending, we have to execute a hyperprivop
 * to ensure the pending interrupt gets delivered; else we're done! */
static void
xen_ssm_i(void)
{
	int old = xen_get_virtual_psr_i();
	xen_set_virtual_psr_i(1);
	barrier();
	if (!old && xen_get_virtual_pend())
		xen_hyper_ssm_i();
}

/* turning off interrupts can be paravirtualized simply by writing
 * to a memory-mapped virtual psr.i bit (implemented as a 16-bit bool) */
static void
xen_rsm_i(void)
{
	xen_set_virtual_psr_i(0);
	barrier();
}

static unsigned long
xen_get_psr_i(void)
{
	return xen_get_virtual_psr_i() ? IA64_PSR_I : 0;
}

static void
xen_intrin_local_irq_restore(unsigned long mask)
{
	if (mask & IA64_PSR_I)
		xen_ssm_i();
	else
		xen_rsm_i();
}

static const struct pv_cpu_ops xen_cpu_ops __initconst = {
	.fc		= xen_fc,
	.thash		= xen_thash,
	.get_cpuid	= xen_get_cpuid,
	.get_pmd	= xen_get_pmd,
	.getreg		= xen_getreg,
	.setreg		= xen_setreg,
	.ptcga		= xen_ptcga,
	.get_rr		= xen_get_rr,
	.set_rr		= xen_set_rr,
	.set_rr0_to_rr4	= xen_set_rr0_to_rr4,
	.ssm_i		= xen_ssm_i,
	.rsm_i		= xen_rsm_i,
	.get_psr_i	= xen_get_psr_i,
	.intrin_local_irq_restore
			= xen_intrin_local_irq_restore,
};

/******************************************************************************
 * replacement of hand written assembly codes.
 */

extern char xen_switch_to;
extern char xen_leave_syscall;
extern char xen_work_processed_syscall;
extern char xen_leave_kernel;

const struct pv_cpu_asm_switch xen_cpu_asm_switch = {
	.switch_to		= (unsigned long)&xen_switch_to,
	.leave_syscall		= (unsigned long)&xen_leave_syscall,
	.work_processed_syscall	= (unsigned long)&xen_work_processed_syscall,
	.leave_kernel		= (unsigned long)&xen_leave_kernel,
};

/***************************************************************************
 * pv_iosapic_ops
 * iosapic read/write hooks.
 */
static void
xen_pcat_compat_init(void)
{
	/* nothing */
}

static struct irq_chip*
xen_iosapic_get_irq_chip(unsigned long trigger)
{
	return NULL;
}

static unsigned int
xen_iosapic_read(char __iomem *iosapic, unsigned int reg)
{
	struct physdev_apic apic_op;
	int ret;

	apic_op.apic_physbase = (unsigned long)iosapic -
					__IA64_UNCACHED_OFFSET;
	apic_op.reg = reg;
	ret = HYPERVISOR_physdev_op(PHYSDEVOP_apic_read, &apic_op);
	if (ret)
		return ret;
	return apic_op.value;
}

static void
xen_iosapic_write(char __iomem *iosapic, unsigned int reg, u32 val)
{
	struct physdev_apic apic_op;

	apic_op.apic_physbase = (unsigned long)iosapic -
					__IA64_UNCACHED_OFFSET;
	apic_op.reg = reg;
	apic_op.value = val;
	HYPERVISOR_physdev_op(PHYSDEVOP_apic_write, &apic_op);
}

static const struct pv_iosapic_ops xen_iosapic_ops __initconst = {
	.pcat_compat_init = xen_pcat_compat_init,
	.__get_irq_chip = xen_iosapic_get_irq_chip,

	.__read = xen_iosapic_read,
	.__write = xen_iosapic_write,
};

/***************************************************************************
 * pv_ops initialization
 */

void __init
xen_setup_pv_ops(void)
{
	xen_info_init();
	pv_info = xen_info;
	pv_init_ops = xen_init_ops;
	pv_fsys_data = xen_fsys_data;
	pv_patchdata = xen_patchdata;
	pv_cpu_ops = xen_cpu_ops;
	pv_iosapic_ops = xen_iosapic_ops;
	pv_irq_ops = xen_irq_ops;
	pv_time_ops = xen_time_ops;

	paravirt_cpu_asm_init(&xen_cpu_asm_switch);
}